reference signal transmission method, mobile station apparatus and base station apparatus

专利摘要:
REFERENCE SIGNAL TRANSMISSION METHOD, MOBILE STATION DEVICE AND BASE STATION DEVICEIn order to efficiently use the radio resources used in SRS transmission, one feature is for a base station handset (eNode B) to transmit a programming grant including instructions for transmitting SRS (Sound Reference Signal), and that a mobile station apparatus (UE) transmits an SR corresponding to the scheduling grant. The SRS is transmitted in the same subframe, another subframe, or a previous subframe for the predetermined number of subframes as, immediately before, or before a subframe of a PUSCH (Physical Uplink Shared Channel) that the UE device is instructed to grant schedule instructs to transmit.
公开号:BR112012019993A2
申请号:R112012019993-5
申请日:2011-02-15
公开日:2020-08-18
发明作者:Yoshihisa Kishiyama；Teruo Kawamura；Daisuke Nishikawa
申请人:Ntt Docomo, Inc.；
IPC主号:

专利说明:

Descriptive Report of the Patent of Invention for "REFERENCE SIGNAL TRANSMISSION METHOD, MOBILE STATION DEVICE AND BASE STATION DEVICE".
Field of the Art The present invention relates to a method of transmitting a reference signal, a mobile station apparatus and a base station apparatus, and more particularly, it relates to a method of transmitting a signal of reference to a mobile station apparatus and a base station apparatus in the next generation mobile communication system. Background Art In UMTS (Universal Mobile Telecommunications System) networks, for the purpose of improving spectral efficiency and improving . additionally data rates, adopting HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access), this is accomplished by exploring & maximum system resources based on W-CDMA (Broadband Code Division Multiple Access). In a UMTS network, for the purpose of further increasing high-speed data rates, providing a small delay, or the like, Long Term Evolution (LTE) was studied (for example, see Document of Non-Patent 1).
In the 3G system, a fixed band of 5 MHz is substantially used, and it is possible to obtain transmission rates of a maximum of approximately 2 Mbps in the downlink. However, in the LTE scheme system, using variable bands ranging from 1.4 MHz to 20 MHz, it is possible to obtain a transmission rate of a maximum of 300Mbps in the downlink and about 75Mbps in the uplink. Furthermore, in the UMTS network, for the purpose of further increasing broadband and high speed, the successor systems to LTE were studied (eg Advanced LTE (LTE-A)). For example, in LTE-A, it is programmed to increase 20 MHz which is the maximum system band in LTE specifications up to about 100 MHz.
In the LTE scheme system (LTE system), a base station device measures the uplink channel quality based on an SRS (Sound Reference Signal) for measuring channel quality transmitted from a device. station, performs a schedule for the mobile station apparatus to transmit a data channel signal (PUSCH: Physical Uplink Shared Channel), and issues instructions on a PDCCH (Physical Downlink Control Channel). In this case, the SRS for channel quality mediation is multiplexed into a last symbol in some of the subframes constituting an uplink radio frame, and is transmitted periodically at 5 msec intervals from the mobile station apparatus to the base station apparatus 7. . Prior Art Literature Non-Patent Literature E) Non-Patent Literature 1 3GPP, TR25.912 (V7.1.0), "Feasibi- lity study for Evolved UTRA and UTRAN", Sep. 2006
SUMMARY OF THE INVENTION Technical Problem However, in the LTE system, even when there is no data channel signal (PUSCH) transmitted from the uplink mobile station apparatus, the SRS is periodically transmitted to the base station apparatus. Therefore, radio resources for use in SRS transmission are fixedly used regardless of the presence or absence of a data channel (PUSCH) signal, and there is a problem that it is difficult to use radio resources efficiently.
The present invention is designed with this problem in mind, and an object of the invention is to provide a reference signal transmission method, a mobile station apparatus and a base station apparatus for enabling radio resources to be used. used in SRS transmission are used efficiently.
Problem Solution A reference signal transmission method of the invention is characterized by having the steps of transmitting a scheduling grant | to including an instruction for transmitting an Audible Reference Signal (SRS) from a base station apparatus, and transmitting the SRS from a mobile station apparatus in response to the instruction for transmitting the SRS included in the scheduling grant.
A reference signal transmission method of the invention is characterized by having the steps of transmitting an uplink scheduling grant including an instruction for transmitting the Audible Reference Signal (SRS) from a base station apparatus, and transmit the SRS from a mobile station apparatus in response to the instruction to transmit the SRS included in the uplink IS scheduling grant. . According to this method, since the mobile station apparatus! transmits an SRS in response to the SRS transmission instruction “15 included in the uplink scheduling grant, it is possible . dynamically control a subframe into which the SRS is multiplexed, and in this way it is possible to efficiently use the radio resources used in the transmission of the SRS.
A mobile station apparatus of the invention is characterized by having a receiving section configured to receive an uplink scheduling grant including an instruction for transmitting an SRS from a base station apparatus, the configured multiplexing section for multiplexing the SRS into a predetermined symbol in response to the instruction to transmit the SRS included in the uplink scheduling grant, and the transmit section configured to transmit the multiplexed SRS in the multiplexing sections to the base station apparatus.
According to this configuration, since the SRS is transmitted only in case it receives an uplink scheduling grant notification including the instruction to transmit the SRS, it is possible to dynamically control a subframe into which the SRS is multiplexed, and , in this way, it is possible to efficiently use the radio resources used in the SRS transmission.
A base station apparatus of the invention is characterized by having the generation section configured to generate an uplink scheduling grant including an instruction for transmitting an SRS, and the transmission section configured to transmit the generated uplink scheduling grant. in the generation section to a mobile station apparatus.
According to this configuration, since the uplink scheduling grant including the instruction for transmission of the SRS is transmitted, the base station apparatus is able to instruct the transmission of the SRS by the uplink scheduling grant. , it is possible to dynamically control a subframe in which the SRS is mul- . triplexed, and thus it is possible to efficiently use the radio resources used in the transmission of the SRS. “15 Technical Advantages of the Invention . In accordance with the invention, it is possible to provide a reference signal transmission method, a mobile station apparatus and a base station apparatus to enable the radio resources used in SRS transmission to be used efficiently. Brief Description of the Drawings Figure 1 is a diagram that serves to explain a method of transmitting SRSs in an LTE system; Figure 2 is a diagram serving to explain SRSs transmitted in a reference signal transmission method in accordance with the first aspect of the invention; Figure 3 is a diagram serving to explain SRSs transmitted in a reference signal transmission method according to a second aspect of the invention; Figure 4 is a diagram serving to explain SRSs transmitted in a reference signal transmission method according to a third aspect of the invention; Fig. 5 is a diagram serving to explain a subframe in an SRS multiplexed in a reference signal transmission method according to a fourth aspect of the invention;
Figure 6 contains diagrams that serve to explain a symbol for multiplexing an SRS in the reference signal transmission method.
— performance according to the fourth aspect of the invention;
Fig. 7 is a diagram serving to explain a subframe with an SRS multiplexed in the reference signal transmission method according to the first aspect of the invention;
Fig. 8 is a diagram serving to explain a symbol for multiplexing an SRS in a reference signal transmission method according to a fifth aspect of the invention; Í Figure 9 is a diagram that serves to explain a symbol. to multiplex an SRS into a reference signal transmission method according to a sixth aspect of the invention; 5 Figure 10 is a diagram that serves to explain a symbol. to multiplex an SRS into a reference signal transmission method according to a seventh aspect of the invention;
Fig. 11 is a diagram serving to explain a symbol for multiplexing an SRS in a reference signal transmission method according to an eighth aspect of the invention;
Figure 12 is a diagram that serves to explain a configuration of a mobile communication system in accordance with an embodiment of the invention;
Fig. 13 is a block diagram serving to illustrate a complete configuration of a mobile station apparatus in accordance with the embodiment;
Fig. 14 is a block diagram serving to illustrate a complete configuration of a base station apparatus in accordance with the embodiment;
Fig. 15 is a functional block diagram of a baseband signal processing section which, according to the embodiment, the mobile station apparatus has;
Fig. 16 is a functional block diagram of a baseband signal processing section which, according to the embodiment, the base station apparatus has;
Fig. 17 is a diagram serving to explain a symbol for multifaceting an SRS in a reference signal transmission method according to a ninth aspect of the invention;
Fig. 18 is a diagram serving to explain a symbol for multifaceted SRS in a reference signal transmission method according to a tenth aspect of the invention;
Fig. 19 contains diagrams for explaining a scheduling grant transmitted in a reference signal transmission method in accordance with an eleventh aspect of the invention; . Figure 20 contains diagrams that serve to explain the transmission power information and the extended transmission power control information transmitted in the transmission method of: reference signal according to the eleventh aspect of the invention. ;
Fig. 21 is a diagram serving to explain an SRS transmitted in the reference signal transmission method according to the eleventh aspect of the invention;
Fig. 22 is a functional block diagram of a baseband signal processing section which, in accordance with a modification of the invention, has a mobile station apparatus; and
Fig. 23 is a functional block diagram of a baseband signal processing section which, according to a modification of the invention, has a base station apparatus.
Description of Modalities Figure 1 is a diagram that serves to explain a method of transmitting Audible Reference Signals (SRSs) in an LTE system.
As shown in Figure 1, in the LTE system, an SRS for channel quality measurement is multiplexed into a last symbol in some of the subframes (subframes tn to $n+9) that constitute an uplink radio frame (UL) , and is transmitted periodically at 5 msec intervals from a mobile station apparatus UE to a base station apparatus eNode B.
Figure 1 shows the case where an SRS is multiplexed into a last symbol of each of the subframes ftn+1 and fn+6. However, a data channel signal (PUSCH: Physical Uplink Shared Channel) is transmitted 4 TTIs (Transmission Time Intervals) later, after receiving a notification of an uplink scheduling grant (UL) on a PDCCH (Physical Downlink Shared Channel). In the present document, the subframe is a unit of transmission time of a data packet subjected to error correction encoding (channel encoding), and is equal to 1 TT1. Therefore, upon receipt of notification of a "scheduling grant in UL, the PUSCH is transmitted 4 subframes. later."
Figure 1 shows the case where among the subframes (subframe number tm to fm+9) that constitute a downlink radio frame (DL), a UL scheduling grant is notified in - subframes fm to ttm +2 and ffm+4, and in response to the UL scheduling grant, the PUSCH is transmitted in subframes ifnt+4 to fn+6 and fn+8 uplink (UL). As shown in Figure 1, the SRS is transmitted regardless of the presence or absence of the transmitted PUSCH in each subframe, and therefore, even if there is no notification of the scheduling grant in UL and the PUSCH is not transmitted, the SRS is transmitted to base station apparatus eNode B periodically on uplink (UL). From the point of view of efficiently utilizing radio resources, for the SRS for the purpose of measuring the amount of channel in the eNode B base station device, it is preferable that the SRS is measured when the PUSCH is transmitted. .
However, in the LTE system, since the radio resources used in SRS transmission are fixedly used regardless of the presence or absence of the PUSCH, it is difficult to use the radio resources efficiently.
The inventors of the invention noted that radio resources are used wastefully because the SRS is transmitted regardless of the presence or absence of the PUSCH, and they arrived at the invention.
In other words, in a reference signal transmission method according to the invention, instead of transmitting the SRS periodically, dynamically controlling the presence or absence of SRS transmission, it is intended to use efficiently use the radio resources used in SRS transmission.
More specifically, by instructing a mobile station apparatus UE to transmit the SRS by the UL scheduling grant that serves to instruct the UE to transmit the PUSCH, the subframe in which the SRS is multiplexed is dynamically controlled, is rendered it is not possible to efficiently use the radio resources used in SRS transmission.
A reference signal transmission method according to the invention shall include 1 bit (in the following parts of this document, referred to as a "transmission identification bit") to identify the presence or absence of transmission (transmission ON-“15 ON/OFF) of SRS on a mobile station handset UE on a UL-scheduling grant notified on a PDCCH from a base station handset eNode B.
The mobile station apparatus UE controls the transmission timing of the SRS dynamically in response to the transmission identification bit.
Through this, it is possible to dynamically control the subframe into which the SRS is multiplexed in response to the transmission identification bit of the UL scheduling grant, and in this way it is possible to use the radio resources used in the transmission of SRS
In a reference signal transmission method in accordance with the first aspect of the invention, an eNode B base station apparatus selects a UL scheduling grant, in which "1" transmission ON indicator is assigned to the transmission identification bit, and instructs a mobile station apparatus UE whether or not to transmit an SRS by the selected UL scheduling grant, and the mobile station apparatus UE transmits the SRS in the same PUSCH subframe as the UL scheduling grant including the transmit identification bit instructs to transmit.
Fig. 2 is a diagram serving to explain the SRSs transmitted in the reference signal transmission method according to the first aspect. Figure 2 shows the case where the base station apparatus eNode B selected UL scheduling grants of subframesimt+4 as a UL scheduling grant including instruction(s) for transmitting SRS (in other words, the SRS bit). transmission transmission ID ON). Upon receipt of the UL scheduling grant notification including instructions for transmitting SRS, the mobile station apparatus UE transmits the SRS to the base station apparatus eNode B along with the PUSCH transmitted in subframes ttn+4 and ftn+ 8 which is 4 subframes later in response to the 'scheduling grant in UL.
In the reference signal transmission method according to: the first aspect, the SRS is transmitted in the same PUSCH subframe "15 as the UL scheduling grant including instructions for trans- . mission instructs to transmit, and therefore is multiplexed into the last symbol of each of the fn+4 and ftn+8 subframes. In other words, the SRS is successively multiplexed subsequent to the PUSCH assigned to subframes tn+4 and fn+8. The base station apparatus eNode B measures the quality of —channel based on the SRS which is successively multiplexed after the PUSCH, and performs a schedule for transmission of PUSCH in the mobile station apparatus UE. Therefore, the base station apparatus is able to measure the channel quality at a timing where the PUSCH is actually transmitted, and thus is able to perform a schedule while refreshing the actual channel state. Furthermore, the eNode B base station apparatus selects the UL scheduling grant including instructions for transmitting SRS, in consideration of the presence or absence of an interval from the UL scheduling grant including instructions for transmitting SRS that have been previously transmitted, and the like. For example, when a predetermined interval (e.g., 4 TTIS5) has elapsed since the UL scheduling grant including instructions for transmission that was previously transmitted, the UL scheduling grant including instructions for SRS transmission is selected as a UL scheduling grant that will be transmitted later.
Furthermore, the method of selecting the UL scheduling grant including instructions for transmitting SRS is capable of being modified as appropriate, which is the same as the reference signal transmission methods in accordance with the second and third aspects. , described below.
In a method of transmitting a reference signal according to a second aspect of the invention, a base station apparatus eNode B selects a UL scheduling grant, in which "1" transmit ON indicator is assigned to the transmit identification bit. , 7 and instructs a mobile station apparatus UE whether or not to transmit an SRS by the selected UL scheduling grant, and the mobile station apparatus UE transmits the SRS in a subframe immediately before a "15 —subframe of the PUSCH that the UL scheduling grant including the : transmit identification bit instructs to transmit.
Fig. 3 is a diagram serving to explain the SRSs transmitted in the reference signal transmission method according to the second aspect.
As in Fig. 2, Fig. 3 shows the case where the base station apparatus eNode B selects UL scheduling grants of end and fm+4 subframes as a UL scheduling grant including instructions for SRS transmission.
Upon receipt of the UL scheduling grant notification including instructions for transmitting the SRS, the mobile station apparatus UE transmits the SRS to the base station apparatus eNode B in subframes fn+3 and Hn+7 which are, respectively, immediately preceding subframes ffn+4 and fn+8 to transmit the PUSCH in response to the DL scheduling grant.
In the reference signal transmission method according to the second aspect, the SRS is transmitted in a subframe immediately before a subframe of the PUSCH which the UL scheduling grant including instructions for transmission instructs to transmit, and therefore is multiplexed. in the last symbol of each of the Mn+3 and Entro subframes.
In other words, the SRS is successively multiplexed before the PUSCH assigned to subframes ftn+4 and ffn+8. The base station apparatus eNode B measures the channel quality based on the SRS which is successively multiplexed before the PUSCH, and performs a schedule for transmission of PUSCH in the mobile station apparatus UE.
Therefore, the base station is able to measure channel quality at a timing where the PUSCH is actually transmitted, and therefore is able to perform a schedule while reflecting the actual channel state.
In a reference signal transmission method according to a third aspect of the invention, an eNode 2B base station apparatus selects a UL scheduling grant, in which "1" is indicative. transmission ON is assigned the transmission identification bit, and instructs a mobile station UE apparatus whether or not to transmit an SRS a-"15 via the selected UL scheduling grant, and the . mobile station UE transmits the SRS in a previous subframe for the predetermined number of subframes before the PUSCH subframe that the UL scheduling grant including the transmission identification bit instructs to transmit.
Fig. 4 is a diagram serving to explain the SRSs transmitted in the reference signal transmission method according to the third aspect.
As in figures 2 and 3, figure 4 shows the case where the base station apparatus eNode B selects scheduling grants in UL subframes im and ttm+4 as a scheduling grant in UL including instructions for transmission of SRS
Upon receipt of the UL scheduling grant notification including instructions for transmitting the SRS, the mobile station apparatus UE transmits the SRS to the base station apparatus eNode B in subframes fn+1 and fn+5 which are subframes by the predetermined number of subframes (in the present document, 3 subframes) before subframes ffn+4 and tn+8 transmit the PUSCH in response to the UL scheduling grant.
In the reference signal transmission method according to the third aspect, the SRS is transmitted in a 3-subframe subframe before the PUSCH subframe that the UE apparatus is instructed to transmit in the UL scheduling grant including instructions for transmission, and therefore it is multiplexed into the last symbol of each of the subframes ftn+1 and tin+5. In other words, the SRS is multiplexed before the PUSCH is assigned to subframes tfn+4 and ftn+8. The base station apparatus eNode B measures the channel quality based on the SRS that is multiplexed before the PUSCH, and performs a schedule for transmission of PUSCH on the mobile station apparatus UE. Therefore, the base station apparatus is able to measure channel quality at a timing that approximates the timing at which the PUSCH is actually transmitted, and is able to reflect the . scheduling content in the subsequent UL scheduling grant including instructions for transmission. 5 The description will be provided using a specific example - as shown in figure 4. The base station apparatus eNode B measures channel quality based on the SRS multiplexed into the last symbol of the subframe tn+1 transmitted from the base station apparatus mobile UE, and based on a channel quality measurement result, performs a schedule for PUSCH transmission in the mobile station apparatus UE. In the present document, it is possible to make a schedule before the ftm+4 subframe to which the UL schedule grant including instructions for SRS transmission is assigned next, and in this way it is possible to reflect the contents of this schedule in the schedule grant. - —mentoin UL of fm+4 subframe.
Furthermore, in the reference signal transmission method according to the third aspect, a case is shown where the mobile station apparatus UE transmits the SRS in a previous subframe by the predetermined number of subframes before the PUSCH subframe. that the UL scheduling grant including instructions for transmission instructs to transmit, however, it is also possible to transmit the SRS in a later subframe for the predetermined number of subframes after the subframe of the
PUSCH that the UL scheduling grant including instructions for transmission instructs to transmit. Therefore, by providing flexible SRS transmission timing, it is possible to adjust inter-user interference, and the like. The reference signal transmission method according to the third aspect is to transmit the SRS in an earlier or later subframe for the predetermined number of subframes before or after the PUSCH subframe that the UL scheduling grant instructs to transmit.
In a reference signal transmission method in accordance with the fourth aspect of the invention, a base station apparatus eNode B selects a UL scheduling grant, in which "1" indicative of Y transmission ON is assigned to the transmission identification bit. , and - instructs a mobile station apparatus UE whether or not to transmit an SRS by the selected UL scheduling grant, and with reference to a "15 —previous subframe by the predetermined number of subframes before the . subframe of the PUSCH that the UL scheduling grant including the transmission identification bit instructs to transmit, the mobile station apparatus UE transmits the SRS in a first transmittable subframe of SRS from the reference subframe. Fig. 5 is a diagram serving to explain the SRSs transmitted in the reference signal transmission method according to the fourth aspect. As in figures 2 and 3, figure 5 shows the case where the base station apparatus eNode B selects the UL scheduling grants of subframes ttm and ftm+4 as a UL scheduling grant including instructions for transmission of SRS. Also, in uplink, subframes (ftn+1, fn+4, fin+7) are allowed to transmit the SRS. Since SRS transmission is restricted to subframes used in transmitting broadcast information and RRC control information, the subframes allowed to transmit SRS are limited in advance. In the example as shown in Fig. 5, the mobile station apparatus UE receives the scheduling grant in UL by including instructions for transmitting SRS in the downlink subframe tm.
downstream, and transmits the PUSCH in subframe tn+4 for four subframes after subframe tm.
As a reference, using subframe n+1 which is a subframe before subframe x (in the figure, x=3) from subframe tn+4 to transmit the PUSCH, the SRS is transmitted in the first —transmittable subframe of SRS including the fn+1 reference subframe. In the example as shown in figure 5, the reference subframe fn+1 is the first transmittable subframe of SRS.
Further, the mobile station apparatus UE receives the UL scheduling grant including instructions for transmitting SRS in downlink subframe %fm+4, and transmits the PUSCH in subframe ffn+8 for four subframes after subframe fm +4. As a reference, using a sub- :frame ttn+5 which is a previous 3-subframe subframe from subframe fn+8 to transmit the PUSCH, the SRS is transmitted in the first transmittable subframe of SRS of the reference subframe tn+5. In the example “15 as shown in figure 5, the reference subframe ffn+5 is not the pri- . first transmittable subframe of SRS.
The first transmittable SRS subframe from the reference subframe ftn+5 is a subframe ffn+7, and the
SRS is transmitted in the fn+7 subframe. Therefore, applying the rule to transmit the SRS in the first transmittable subframe of SRS from the reference subframe, even when broadcasting information and RRC control information is transmitted in an earlier subframe for a preset number. terminated of subframes before the subframe to transmit the PUSCH, it is possible to avoid a collision with the SRS.
In the reference signal transmission methods according to the first to the fourth aspects, the subframe for transmitting the SRS is es- | specified in response to the UL scheduling grant including instructions for transmitting SRS (e.g., in the reference signal transmission method according to the first aspect, 4 subframes later) In this case, as a method of specifying a subframe to transmit the SRS, the information to specify the subframe can be included in the UL scheduling grant.
Alternatively, the information for specifying the subframe may be defined in the mobile station apparatus UE by the specification, such that the subframe is specified by the specification in response to receipt of the UL scheduling grant. In the case of specifying a subframe to transmit the SRS in response to the information included in the UL scheduling grant, it is also possible to switch between the reference signal transmission methods according to the first to the fourth aspects for application. Furthermore, in the LTE system, resource information (in the following parts of this document, referred to as "SRS de-multiplexing information") for multiplexing SRSs from a plurality of mobile station apparatus UEs on the same token are notified to each mobile station apparatus UE by RRC signaling. For example, the SRS multiplexing information includes position information (Comb: 1 bit) indicating whether the subframe for multiplexing the SRS is an odd-numbered subframe or an even-numbered subframe, a degree of mismatch. . location (Cyclic shift: 3 bits) assigned to each mobile station apparatus UE in SRS code multiplexing, bandwidth (2 bits) targeted for multiplexing the SRS, and a frequency position (undetermined bit) for multiplex the SRS.
In the reference signal transmission method according to the invention which serves to dynamically control the transmission timing of SRS, it is preferable to notify such SRS multiplexing information with a UL scheduling grant (PDCCH). However, in the case of including all SRS multiplexing information in the UL scheduling grant for notification, it is conceivable that the amount of information attributed to the UL scheduling grant will increase, and that the efficiency of UL scheduling grant generation, and the like, deteriorates in the base station apparatus eNode B. Therefore, in the reference signal transmission method according to the invention, SRS multiplexing information is reported using either signaling layer (RRC signaling) such as UL Scheduling Grant (PDCCH).
For example, in the reference signal transmission method according to the invention, the position information (Comb: 1 bit) of the subframe for multiplexing the SRS and the bandwidth (2 bits) targeted for multiplexing the SRS are notified by the RRC signaling, while the offset degree (Cyclic offset: 3 bits) assigned to each UE mobile station apparatus, and the frequency position (variable bit) for multiplexing the SRS are notified with the UL scheduling grant ( PDCCH). In this case, it is possible to notify the mobile station apparatus UE of the SRS multiplexing information included in the UL scheduling grant (PDCCH) earlier than the SRS multiplexing information included in the RRC signaling, and the mobile station UE is able to immediately carry out a control using the information. of SRS multiplexing.
Furthermore, the SRS multiplexing information assigned to the RRC signaling and scheduling grant in “15 UL (PDCCH) is not particularly limited, it is capable of being
. modified as appropriate.
Also, in case of reporting SRS multiplexing information using both higher layer signaling and PDCCH, it is preferable to report SRS multiplexing information transmitted on the PDCCH using other control bits on the PDCCH.
Aspects of using other control bits include either overwriting other control bits with the SRS multiplexing information or using other control bits as the SRS multiplexing information.
For example, as an example, we describe the case where bandwidth (2 bits) and frequency position (variable bit) are reported using RRC signaling, and instructions for transmitting SRS, position information (Comb: 1 bit) of the subframe and the degree of shift (Cyclic shift: 3 bits) are reported using the PDCCH.
In the instructions for transmitting SRS, 1 reserved bit in the PDCCH is used.
The position information (Comb: 1 bit) of the subframe and the degree of shift (Cyclic shift: 3 bits) which are remaining resource information are | overwritten in other control bits.
Alternatively, the other control bits are used.
Figure 6 shows a format configuration (DCI O format) of a UL scheduling grant transmitted on the PDCCH. Fig. 6A shows a format when instructions for transmitting SRS are OFF, and Fig. 68B shows a format when instructions for transmitting SRS are ON. As shown in Figure 6A, in DCI 0 format, the first 1 bit is an indicator to identify either the DCI Format 1 or the DCI Format O. The second bit is a control bit indicative of the presence or absence of a jump from frequency on an uplink control channel. The third through ninth bits are control bits for resource block assignment information indicative of the user-assigned resource block positions. Subsequent to the bits, the . control for MCS information for the assigned resource blocks and redundancy version (RV) are assigned, and 1 bit of an identifier (new data indicator) is provided to distinguish between new data and . relay data. In addition, the control bits for a PUSCH transmit power control (TPC) command and cyclic shift (CS to DMRS) for a demodulation reference signal are set, and a request is set. of CQI. After the CQI request, 2 bits are added as padding bits. The first bit of the filler bits is used for instructions for transmitting SRS. SRS transmission is OFF when the control bit is "0", while it is ON when the control bit is "1". As shown in Fig. 6B, when the instruction for transmitting SRS is ON, "1" is set to the first bit of the stuffing bits. The position information (Comb: 1 bit) of the subframe is overwritten in the control bit (second bit) indicating the presence or absence of frequency hopping. For the degree of shift (Cyclic shift: 3 bits), the cyclic shift control bits (CS for DMRS) are used for a demodulation reference signal which are the same number of bits as the degree of shift. In other words, the degree of shift for SRS multiplexing and the cyclic shift (CS for DMRS) for a demodulation reference signal are linked and become the same bit value. In this way, it is possible to notify the SRS multiplexing information transmitted on the PDCCH using other control bits on the PDCCH, and it is possible to prevent the number of UL scheduling grant bits (DCI 0 format) from increasing .
Furthermore, in the reference signal transmission methods according to the first to the fourth aspects, the SRS is multiplexed into the last symbol of the particular subframe in response to the UL scheduling grant notified from the base station apparatus. eNode B. For example, as shown in Figure 7, the SRS is multiplexed into the last symbol of the corresponding subframe. The PUSCH is multiplexed into a resource block (Nrg) assigned to the mobile station apparatus UE. The DMRS' (Demodulation Reference Signal) is multiplexed into a third symbol in each partition in the resource block (Neg) assigned to the mobile station apparatus UE. Furthermore, Fig. 7 shows the subframe in which the SRS in the “15 reference signal transmission method according to the first as- . pect is multiplexed. In the present document, the reference signal transmission method according to the first aspect is described as an example, and the reference signal transmission methods according to the second to fourth aspects also occur in the same manner.
However, in the reference signal transmission methods according to the first to the fourth aspects, since a symbol allowed to multiplex the SRS is limited to the last symbol of a subframe, and therefore, for example, when the mobile station apparatus UE is positioned at the end of the cell to which the apparatus UE belongs, such an event may occur where the mobile station apparatus UE is devoid of transmit power and where the base station apparatus e-Node B is unable to receive the SRS properly. To support such an event, in the reference signal transmission methods according to the fifth to eighth aspects of the invention, the SRS is multiplexed into a plurality of symbols other than the last symbol.
In the reference signal transmission method according to the fifth aspect of the invention, the SRS is multiplexed by overlapping with the
DMRS of the corresponding subframe. Fig. 8 is a diagram serving to explain a symbol for multiplexing the SRS in the reference signal transmission method according to the fifth aspect of the invention. As shown in Figure 8, in the fifth method of transmitting the reference signal, the SRS is multiplexed into the third symbol of each of the partitions constituting the corresponding subframe, and transmitted to base station apparatus eNode B simultaneously with DMRS. Furthermore, it is possible to update the multiplexing of the SRS overlaid with the DMRS, for example, using a code orthogonal to the DMRS, and the like. Therefore, in the reference signal transmission method according to the fifth aspect, since a plurality of SRSs (2 SRSs) are multiplexed and transmitted in the subframe specified by the grant of . UL scheduling including instructions for transmitting SRS, it becomes easier for the base station apparatus eNode B to properly receive the SRS, compared to the dog of multiplexing the SRS only on the last - symbol.
In the reference signal transmission method according to the sixth aspect of the invention, the SRS is multiplexed by overlapping with the PUSCH of the corresponding subframe. Fig. 9 is a diagram serving to explain a symbol for multiplexing the SRS in the reference signal transmission method according to the sixth aspect of the invention. As shown in Figure 9, in the sixth method of transmitting the reference signal, the SRS is multiplexed into all symbols except the third symbol from each of the partitions that make up the corresponding subframe and the last symbol of the corresponding subframe. , and is transmitted to the base station apparatus eNode B simultaneously with the PUSCH. In this case, it is preferable to transmit the SRS with a transmission power lower than the PUSCH. Therefore, in the reference signal transmission method according to the sixth aspect, since a plurality of SRSs (11 SRSs) are multiplexed and transmitted in the subframe specified by the DL scheduling grant including the instructions for transmitting SRS, it becomes it is easier for the eNodeB base station handset to receive appropriate
the SRS, compared to the case of multiplexing the SRS on the last symbol only.
Furthermore, since the SRS is multiplexed with the PUSCH, it becomes more difficult to exert the effect on channel quality measurement accuracy on the eNode B base station apparatus, compared to the case of multiplexing the SRS with bDMRS.
In the reference signal transmission method according to the seventh aspect of the invention, the SRS is multiplexed by overlapping with the DMRS and the PUSCH of the corresponding subframe.
In other words, this method corresponds to a reference signal transmission method obtained by combining the reference signal transmission method according to the fifth aspect, and the reference signal transmission method 7 of according to the sixth aspect.
Figure 10 is a diagram for . explain a symbol for multiplexing the SRS in the reference signal transmission method according to the seventh aspect of the invention.
As shown in “15 shown in figure 10, in the seventh method of transmitting the reference signal. The SRS is multiplexed into all symbols except the last symbol of the corresponding subframe, and is transmitted to base station apparatus eNode B together with the PUSCH and DMRS.
Therefore, in the reference signal transmission method of —according to the seventh aspect, since a plurality of SRSs (13 SRSs) are multiplexed and transmitted in the subframe specified by the UL scheduling grant including instructions for transmitting SRS, it becomes It is easier for the base station handset eNode B to properly receive the SRS, compared to the case of multiplexing the SRS on the last symbol only.
Particularly, since the SRS is multiplexed on all symbols except the last symbol of the subframe, it is possible to make it even easier for the base station handset eNode B to receive the SRS, compared to the case of multiplexing the SRS with the PUSCH only. or just with the D-MRS.
In the reference signal transmission method according to the eighth aspect of the invention, the SRS is multiplexed into a resource block different from the resource block assigned to the mobile station apparatus UE in the corresponding subframe.
Fig. 11 is a diagram serving to explain a symbol for multiplexing the SRS in the reference signal transmission method according to the eighth aspect of the invention.
As shown in Figure 11, in the eighth method of transmitting the reference signal, the SRS is multiplexed into all symbols except the last symbol of the subframe in the resource block (Nrg') other than the resource block (Nrm) assigned. - sent to the mobile station apparatus UE, and transmitted to the base station apparatus eNode B together with the PUSCH and the DMRS.
Therefore, in the reference signal transmission method according to the eighth aspect, since a plurality of SRSs (13 SRSs) are multiplexed and transmitted in the subframe specified by the DL scheduling grant including instructions for transmitting SRS, it becomes It is easier for the base station handset eNode B to properly receive the SRS, compared to the case of multiplexing the SRS only on the last “15 symbol.
Furthermore, since the SRS is multiplexed in the resource block - (Ngs) different from the resource block (Nrs) assigned to the mobile station apparatus UE, it is possible to suppress the interference in the PUSCH, compared to the case of multiplexing with the PUSCH
Furthermore, in the case of dynamically selecting symbols to multiplex the SRS, it is also possible to select symbols to multiplex the SRS from the point of view of data channel signal demodulation accuracy (PUSCH) in the base station apparatus eNode B.
In general, in the data channel signal, there is a tendency for demodulation accuracy to deteriorate in symbols at the edge portions of a subframe.
Therefore, it is preferable, as per one embodiment, to multiplex the SRS irrelevant to the data channel signal into symbols where demodulation accuracy deteriorates.
Aspects for multiplexing the SRS are described below.
In a reference signal transmission method in accordance with the ninth aspect of the invention, the SRS is multiplexed into a start symbol of the PUSCH in the corresponding subframe.
Figure 17 is a diagram | which serves to explain a symbol for multiplexing the SRS in the reference signal transmission method according to the ninth aspect of the invention. As shown in Fig. 17, in the ninth reference signal transmission method, the SRS is multiplexed into the resource block (Nre) assigned to the mobile station apparatus UE at the start symbol (0th symbol) of the corresponding subframe, and is transmitted to the base station apparatus eNode B together with the PUSCH.
Therefore, in the reference signal transmission method according to the ninth aspect, the SRS is multiplexed into the start symbol of the PUSCH and transmitted in the subframe specified by the UL scheduling grant including instructions for transmitting SRS. In the case of transmitting the data channel signal (PUSCH), since the SRS is multiplexed into the symbol where the demodulation accuracy tends to deteriorate, it is possible to suppress the demodulation accuracy deterioration of the data channel signal. , while efficiently utilizing radio resources. “5 In a reference signal transmission method according to a tenth aspect of the invention, the SRS is overlay multiplexed with a PUSCH start symbol in the corresponding subframe. Fig. 18 is a diagram serving to explain a symbol for multiplexing the SRS in the reference signal transmission method according to the tenth aspect of the invention. As shown in Fig. 18, in the tenth method of transmitting the reference signal, the SRS is multiplexed into a resource block (Nrg") with a bandwidth including the resource block (Nrs ) assigned to the mobile station apparatus UE in the symbol (0-th symbol) of the corresponding subframe, and is transmitted to base station apparatus eNode B together with the PUSCH.
Therefore, in the reference signal transmission method according to the tenth aspect, the SRS is multiplexed into the PUSCH start symbol and transmitted in the subframe specified by the UL scheduling grant including instructions for transmitting SRS. In the case of transmitting the data channel signal (PUSCH) as in the reference signal transmission method according to the ninth aspect, it is possible to suppress the demodulation accuracy deterioration of the data channel signal, while efficiently uses radio resources. Furthermore, in the reference signal transmission method according to the tenth aspect, it is possible to measure the channel quality based on the SRS multiplexed in the resource block (Nrg") with a bandwidth including the resource block ( Nrg) assigned to the mobile station apparatus UE, and thereby it is possible to improve the channel quality accuracy.
In the reference signal transmission methods according to the first to tenth aspects as described above, the mobile station apparatus UE transmits the SRS in response to instructions for transmitting SRS included in the UL scheduling grant. However, as described in a reference signal transmission method according to an eleventh aspect, the station apparatus. Mobile UE may transmit the SRS in response to instructions for transmitting the SRS included in a scheduling grant other than the UL scheduling grant.
- In the reference signal transmission method according to the eleventh aspect, a scheduling grant is provided for SRS, and the mobile station apparatus UE transmits the SRS in response to instructions for transmission of SRS included in the schedule grant - —mentofor SRS.
Fig. 19 contains diagrams for explaining a scheduling grant format configuration (also referred to as an aperiodic SRS grant) for the SRS used in the reference signal transmission method according to the eleventh aspect of the invention. Figure 19A illustrates a schedule grant format configuration in UL, and Figure 19B illustrates a schedule grant format configuration for SRS. The UL Scheduling Grant of Figure 19A has the same configuration as the UL Scheduling Grant of the case where SRS transmission instructions are turned OFF — as shown in Figure 6A. The scheduling grant for SRS as shown in Fig. 19B serves to notify the mobile station apparatus UE of scheduling information to transmit the SRS as specifically described below.
As shown in Figure 19B, the TXBW (TxBandwidth) of the 1st and 2nd bits of the scheduling grant for SRS is an SRS transmission bandwidth.
The 3rd to 7th bit frequency position is a frequency position for transmitting the SRS.
The 8th bit Comb consists of position information from a subframe to transmit the SRS.
The CS (cyclic shift) from the 9th to the 11th bits is a degree of shift of the SRS cyclic shift.
The 12th and 13th bit hopping BW (Bandwidth) is a frequency hopping band.
The duration of the 14th and 15th bits is an SRS transmission period.
The above-mentioned resource information for transmitting the SRS is notified by the RRC signaling in the "principle, because of the restrictions on the amount of information of the scheduling grant in UL, in the methods of transmitting reference information from according to the first to tenth aspects.
In the method of transmitting reference information according to the tenth: first aspect, since the scheduling grant for SRS is provided, it is possible to notify the mobile station apparatus UE of the resource information to transmit the SRS on PDCCH.
In addition, as shown in Figure 19B, the scheduling grant for SRS is capable of including transmission control information (e.g., Extended Transmit Power Control (Extended TPC) information, timing of transmission control information, and transmission (TA), described later, etc.) to control the transmission of not only the SRS, but also the data channel signal (PUSCH). In addition, the scheduling grant for SRS may include the Extended Transmit Power Control (Extended TPC) information or the Transmission Control (TA) timing information described later, or it may include both information.
The 16th to 19th bit Extended TPC of Fig. 19B consists of extended transmit power control information to control the transmit power of the SRS and/or the data channel signal (PUSCH) in the extended control range.
Figure 20 contains diagrams to explain
25/53 ! the Extended Transmit Power Control (Extended TPC) information. Figure 20A shows the content of transmit power control (TPC) information included in the DL scheduling grant of Figure 19A. The 2-bit transmit power control (TPC) information increases and decreases transmit power by 4 levels. However, Figure 20B shows the contents of the Extended Transmit Power Control (Extended TPC) information included in the scheduling grant for SRS of Figure 19B. The 4-bit Extended Transmit Power Control (TPC) information increases and decreases transmit power by 16 levels. According to the Extended Transmit Power Control (Extended TPC) information, r as the number of bits increases from 2 bits to 4 bits, it is possible to control transmit power of the SRS and/or the signal channel of data (PUSCH): in a wider control range than the “15 transmit power” (TPC) control information. In addition, the po- control information. Extended Transmission Power (Extended TPC) are not limited to 4 bits, and can be 3 bits, or 5 bits or more. The TA (Timing Advance) of the 20th to 23rd bits of Fig. 19B is the transmission control information timing to control the transmission timing of the SRS and/or the data channel signal (PUSCH). Furthermore, the timing of transmission control (TA) information is generally included in a RACH response transmitted from base station apparatus eNode B at the time of initial access by a mobile station apparatus UE. The timing of transmission control information (TA) is notified to the mobile station apparatus UE also by granting scheduling to SRS, and in this way it is possible to avoid the occurrence of transmission timing control errors that occur. are caused by the time elapsed since initial access.
A 24th bit of figure 19B is a control bit used in instructions for transmitting SRS. When granting an appointment for SRS, "1" is set indicating the transmission of an SRS request. As previously described, the scheduling grant
26/53 | for SRS is able to include the transmission control information to control the transmission of not only the SRS, but also the data channel signal (PUSCH), in addition to the resource information to transmit the SRS.
In accordance with such scheduling grant for SRS, also
—when the mobile station apparatus UE resumes the transmission of the data channel signal (PUSCH) after suspending it, it is possible to adjust the transmission power and the transmission timing of the data channel signal (PUSCH) accordingly. Referring to Figure 21, a transmission power control and a data channel signal transmission timing control (PUSCH) using the scheduling grant for SRS in the device are described specifically. of station mo-
: vel EU. > Figure 21 is a diagram that serves to explain the transmission power control and transmission timing control of the “15 data channel signal (PUSCH) using the scheduling grant (also referred to as an aperiodic SRS grant) for the SRS transmitted in the reference signal transmission method according to the eleventh aspect.
As shown in figure 21, when there is a data channel signal (PUSCH) transmitted from the
On the uplink UE mobile station, the base station apparatus eNode B transmits a downlink UL scheduling grant.
The mobile station apparatus UE controls the transmit power of the uplink data channel signal (PUSCH) in accordance with the transmit power control (TPC) included in the schedule grant.
—datum in UL.
In Fig. 21 , the UL scheduling grant is transmitted to the mobile station apparatus UE in downlink subframes tm to ftm+2.
In accordance with the transmit power control (TPC) included in the UL scheduling grant, the mobile station apparatus UE controls the transmit power of the transmitted data channel signal (PUSCH) in subframes tn to tn+2 . However, when the transmission of the data channel signal (PUSCH) transmitted from the uplink mobile station device UE is suspended, then
resumed, there is a case where the transmit power and the transmission timing of the data channel signal (PUSCH) are not properly adjusted.
Therefore, as shown in Fig. 21, when the mobile station apparatus UE resumes transmitting the data channel (PUS-CH) signal, the base station apparatus eNode B transmits the scheduling grant for SRS to the base station apparatus eNode B. mobile UE, in response to a Scheduling Request (not shown) received from the mobile station apparatus UE. According to the Extended Transmission Control (Extended TPC) information and the Transmission Timing (TA) information included in the scheduling grant for SRS, the mobile station apparatus UE controls the transmission power and the uplink data channel signal (PUSCH) transmission timing. In Fig. 21, the scheduling grant for SRS is transmitted to the mobile station UE device in a downlink fm+s subframe. According to the Extended Transmission Control (Extended TPC) information and the transmission timing (TA) information included in the scheduling grant for SRS, the mobile station apparatus UE controls the transmission power and transmission timing. data channel signal (PUSCH) of which transmission is resumed in an itn+s+3 subframe. In the present document, the Extended Transmission Control (Extended TPC) information and the Transmission Timing (TA) information are adjusted to appropriate values by the SRS that is transmitted periodically or in response to instructions for SRS transmission after suspending transmission. data channel signal transmission (PUSCH). Also, in the Extended Transmission Control (Extended TPC) information, the transmission power control range is increased. Accordingly, as shown in Fig. 21, also when the mobile station apparatus UE resumes transmitting the data channel signal (PUSCH) after suspending it, the mobile station apparatus UE is able to adjust the transmission power accordingly and the transmission timing. Furthermore, since the instructions for transmission
SRS are included in the scheduling grant for SRS transmitted in the downlink ffm+s subframe, the mobile station apparatus UE transmits the SRS in an uplink tftn+s subframe. specifically, an embodiment of the invention with reference to the accompanying drawings. In the present document, the case of using the base station apparatus and the mobile station apparatus supporting an LTE-A scheme system (LTE-A system) is described.
Referring to Figure 12, there is described a mobile communication system 1 having mobile station apparatus (UEs) 10 and a base station apparatus (eNode B) 20 according to an embodiment of the invention. BR Figure 12 is a diagram which serves to explain a configuration of mobile communication system 1 having mobile station apparatus 10 and a base station apparatus 20 according to an embodiment of the invention. - Furthermore, the mobile communication system 1 as shown in figure 12 is a system that includes, for example, the LTE or SUPER 36 system. Furthermore, the mobile communication system 1 can be called IMT-Advanced or it can be termed as 4G.
As shown in Fig. 12 , mobile communication system 1 includes base station apparatus 20 and a plurality of mobile station apparatus 10 (101, 102, 103,...,10,,, n is an integer number). where n>0) which communicates with the base station apparatus 20. The base station apparatus 20 is connected to an upper station apparatus 30, and the upper station apparatus 30 is connected to a core network 40 Mobile station apparatus 10 communicates with base station apparatus 20 in a cell 50. In addition, for example, the upper station apparatus includes a gateway apparatus, a radio network controller (RNC) , a mobility management entity (DIME), etc., however, 30 is not limited to these.
Each of the mobile station apparatus 10 (101, 102, 103,...,10,) has the same configuration, function and status, and is described as
29/53 | a mobile station apparatus 10 unless otherwise specified in the description below. Furthermore, for the sake of convenience of description, the same is given while the equipment performing radio communication with the base station apparatus 20 is assumed to be the mobile station apparatus i0, and, more generally, the equipment it can be a user equipment (UE) including mobile station handsets and fixed terminal handsets.
In mobile communication system 1, as a radio access scheme, downlink OFDMA (Orthogonal Frequency Division Multiple Access) is applied, while SC-FDMA (Division Multiple Access) is applied. Single Carrier Frequency) or individual OFDM in uplink bundled DFT. OFDMA is a multi-carrier transmission scheme that serves to divide a frequency band into a plurality of narrow frequency bands (subcarriers-"15"), and map data to each subcarrier to perform communication.
- SC-FDMA is a single-carrier transmission scheme that serves to divide the system bandwidth into bands composed of a single or consecutive block of resources for each terminal in such a way that a plurality of terminals use mutually different bands, and hence mode, reducing interference between terminals. Clustered DFT Scattered OFDM is a scheme that serves to assign a group (cluster) of non-continuous clustered subcarriers in a single mobile station UE, apply a DFT scatter OFDM to each cluster, and thereby obtain multiple uplink accesses.
In the present document, communication channels in the LTE system are described. In downlink, the PDSCH shared between the handsets of mobile station 10, and the downlink L1/L2 control channels (PDCCH, PCFICH and PHICH) is used. In the PDSCH, user data, ie normal data signals, are transmitted. The transmission data is included in the user data. Furthermore, the UL scheduling grant that includes the transmission identification bit as described above is notified to the mobile station apparatus 10 on the L1/L2 control channel (PDCCH).
In uplink, the PUSCH shared between the mobile station apparatus 10 is used, and the PUCCH which is an uplink control channel. User data is transmitted in PUSCH.
However, in the PUCCH, the radio quality information (CQ!I: Channel Quality Indicator) is transmitted in the downlink, etc.
Referring to Figure 13, the entire configuration of the mobile station apparatus 10 in accordance with this Embodiment is described. The LTE terminal and the LTE-A terminal have the same configuration as part of the hardware principle, and will not be distinguished in the description. The mobile station apparatus 10 is provided with a transmit/receive antenna 11, an amplification section 12, a transmit/receive section 13, an amplification section 12, a transmit/receive section 13. baseband signal processing section 14, and an application section 15. The receive section is composed of the transmit antenna 15 —are/receive 11, the amplification section 12, the transmit section sound/reception 13, and by a portion of the baseband signal processing section 14.
With respect to downlink data, a radio frequency signal received at the transmit/receive antenna 11 is amplified 20 in the amplification section 12, subjected to frequency conversion in the transmit/receive section 13, and converted into a baseband signal. . the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, etc. in the baseband signal processing section 14. 25 Among the downlink data, the downlink user data is transferred to the application section 15. The application section performs processing referring to layers greater than the physical layer and the MAC layer and the like. In addition, among the downlink data, broadcasting information is also transferred to application section 15. However, application section 15 inserts uplink user data into baseband signal processing section 14.
The baseband signal processing section 14 performs transmission processing of retransmission control (H-ARQ (Hybrid ARQ)), channel encoding, DFT processing, IFFT processing, and so on. in the data to transfer to the transmit/receive section 13. The transmit/receive section 13 performs frequency conversion processing which serves to convert the baseband signal emitted from the baseband signal processing section 14 into a signal with a radio frequency band, and then the signal is amplified in the amplification section 12, and transmitted from the transmit/receive antenna
11.
Referring to Figure 14, the entire configuration of base station apparatus 20 in accordance with this embodiment is described below. THE . base station apparatus 20 is provided with a transmit/receive antenna 21, an amplification section 22, a transmit/receive section 23, a baseband signal processing section. 24, a call processing section 25, and a transmit path interface 26. The transmit section is composed of the transmit/receive antenna 21, the amplifier section 22, the transmit/receive section 23, and by a portion of the baseband signal processing section 24.
User data transmitted from base station apparatus 20 to downlink mobile station apparatus 10 is fed to baseband signal processing section 24 via transmission path interface 26 from upper station device 30 positioned higher than base station device 20.
The baseband signal processing section 24 performs PDCP layer processing, user data segmentation and concatenation, RLC (Radio Link Control) layer transmission processing, such as RLC relay control transmission, a MAC (Medium Access Control) relay control, e.g. a HARQ (Hybrid Automatic Repeat Request) transmission processing, scheduling,
transmission format selection, channel encoding, Inverse Fast Fourier Transform (IFFT) processing, and pre-encoding processing on the data. Furthermore, for the Physical Downlink Control Channel signals that consist of a downlink control channel, transmission processing is performed, such as channel encoding and a Fast Inverse Fourier Transform, and the result is transferred to the transmit/receive section
23. The transmit/receive section 23 performs frequency conversion processing that serves to convert the baseband signal emitted from the baseband signal processing section 247 into a signal with a radio frequency band, and then the signal is amplified in the amplification section 22 and transmitted from the transmit/receive antenna 21. "5 However, in relation to the signals transmitted from the mobile station apparatus 10 up to the uplink base station apparatus 20, a radio frequency signal received at the transmit/receive antenna 21 is amplified in the amplification section 22. Then, the signal undergoes frequency conversion in the transmit/receive section. reception 23, thereby converted to a baseband signal, and fed to the baseband signal processing section 24.
The baseband signal processing section 24 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC and RLC layer reception processing. PDCP layer on the user data included in the input baseband signal, and transfers the result to the upper station apparatus 30 via the transmission path interface 26. The call processing section 25 performs call processing. call, such as setting and releasing the communication channel, managing base station 20 handset status, and managing radio resources.
33/53 | Fig. 15 is a functional block diagram of the baseband signal processing section 14 that mobile station apparatus 10 has in accordance with this Embodiment. Furthermore, for convenience in description, in the baseband signal processing section 14 as shown in Fig. 15, only the configuration related to the reference signal transmission methods according to the invention is shown, however, section 14 is assumed to be provided with a configuration provided in a normal baseband processing section.
Furthermore, in the following description, "Dynamic SRS" is assumed to refer to an SRS of which the transmission timing is dynamically controlled by the reference signal transmission method according to the invention, and that the "Semi-static SRS" refers to an SRS (ie the SRS in the LTE system) that is periodically transmitted without being dynamically controlled.
"15 An uplink scheduling grant transmitted from the downlink base station apparatus is inserted into a scheduling grant demodulation/decoding section 140, and is demodulated and decoded. Then, the demodulation/decoding result of the uplink scheduling grant is output to a data channel signal generation section 146 and a PUSCH mapping section 148, described later. UL scheduling includes uplink resource block assignment information, mobile station 10 device ID, data size, modulation scheme, uplink transmit-power information, and DMRS information. Reference Signal Transmission According to the fourth aspect of the invention, the UL scheduling grant of the format configuration as shown in Fig. 6A or 6B is decoded. At this point, an interpretation of a portion of control bits is switched, based on whether the instructions for transmitting SRS are "0" (OFF) or "1" (ON). When the instructions for transmitting SRS are "0" (OFF), the control bits are identified in the same interpretation as in LTE.
However, when SRS transmission instructions are "1" (ON), control bits indicative of a DMRS offset degree in LTE are interpreted as control bits indicative of a offset degree (Cyclic offset : 3 bits) of SRS. i As a result of demodulating and decoding the UL scheduling grant, when the UL scheduling grant includes instructions for transmitting Dynamic SRS, the PE result is notified to a Dynamic SRS signal generation section 141. In addition, the presence or absence of instructions for transmitting Dynamic SRS is determined by the presence or absence of the transmission identification bit mentioned above.
Also, when granting scheduling at UL in- Include SRS multiplexing information, the multiplexing information. of SRS are sent to a Dynamic SRS mapping section 142. Furthermore, when the SRS multiplexing information is notified “15 by the RRC signaling, the SRS multiplexing information is also sent to the Dynamic SRS mapping section 142 In the reference signal transmission method according to the fourth aspect of the invention, the transmissible subframe information of SRS is pre-submitted to an RRC signaling, and is provided to the section “mapping of Dynamic SRS 142. However, in the case of receiving a UL scheduling grant without including instructions for transmitting Dynamic SRS, that is, a UL scheduling grant in the LTE system, the result is notified to a signal generation section. 143. In addition, when the SRS multiplexing information is notified by the RRC signaling, the SRS multiplexing information is output to the semi-static SRS mapping section 144 The Dynamic SRS signal generation section 141 generates the Dynamic SRS in response to instructions for transmission included in the UL scheduling grant.
The Dynamic SRS mapping section 142 maps the Dynamic SRS generated in the Dynamic SRS signal generation section 141 to radio resources, based on the multiple-frequency information.
35/53 | SRS xation notified by DL scheduling grant, or SRS multiplexing information notified by RRC signaling. The Dynamic SRS mapping section 142 constitutes the multiplexing section. The Dynamic SRS is multiplexed into a predetermined symbol being mapped to the radio resources by the Dynamic SRS mapping section 142. Then, the Dynamic SRS mapped to the radio resources is output to an Inverse Fast Fourier Transform (IFFT) section 145.
For example, when the Dynamic SRS is generated according to the reference signal transmission method according to the first aspect, the Dynamic SRS is multiplexed into the last symbol of the same subframe as the PUSCH as the scheduling grant in UL including , instructions for transmission instructs to transmit. Also, when the SRS . Dynamic is generated according to the reference signal transmission method according to the second aspect, the Dynamic SRS is multiplexed-"15 owns the last symbol of a subframe immediately before the subframe . of the PUSCH that the scheduling grant in UL including instructions for transmission instructs to transmit. In addition, when the Dynamic SRS is generated according to the reference signal transmission method according to the third aspect, the Dynamic SRS is multiplexed into the last symbol of a previous subframe by the predetermined number of subframes before the PUSCH subframe that the UL scheduling grant including instructions for transmission instructs to transmit. Still additionally, when the Dynamic SRS is generated according to the reference signal transmission method according to the fourth aspect, with reference to an earlier (or later) subframe by the predetermined number of subframes before (or after) the subframe of the PUSCH granting it s- are UL scheduling including instructions for transmit instructs to transmit, the Dynamic SRS is multiplexed into the last symbol of a first transmittable subframe of SRS from the reference subframe. SRS —transmittable subframes are subject to RRC signaling beforehand. Furthermore, when the Dynamic SRS is generated according to the reference signal transmission method according to the fifth aspect, the Dynamic SRS is overlay multiplexed with the DMRS of the corresponding subframe. In addition, when Dynamic SRS is generated according to the reference signal transmission method according to | as a sixth aspect, the Dynamic SRS is overlay multiplexed with the PUSCH of the corresponding subframe. Still further, when the Dynamic SRS is generated according to the reference signal transmission method according to the seventh aspect, the Dynamic SRS is overlay multiplexed with the PUSCH and in the DMRS of the corresponding subframe. Furthermore, when the Dynamic RS is generated according to the reference signal transmission method according to the eighth aspect, the Dynamic F SRS is multiplexed into a resource block different from the resource block assigned to the mobile station apparatus 10 in the corresponding subframe. Furthermore, when Dynamic SRS is generated in accordance with the “15 reference signal transmission method in accordance with the ninth aspect, the . Dynamic SRS is multiplexed into a PUSCH start symbol in the corresponding subframe. Furthermore, when the Dynamic SRS is generated according to the reference signal transmission method according to the tenth aspect, the Dynamic SRS is overlay multiplexed with a PUSCH start symbol in the corresponding subframe. The semi-static SRS signal generating section 143 generates a semi-static SRS in response to the UL scheduling grant. The semi-static SRS mapping section 144 maps the semi-static SRS based on the SRS multiplexing information notified by the RRC signaling. In this case, the semistatic SRS is mapped to a last symbol of a last subframe for 4 subframes after receiving notification of the UL scheduling grant. Then, the semi-static SRS mapped to the radio resources is output to the Inverse Fast Fourier Transform (IFFT) 145 section. data channel signal
146. The data channel signal generation section 146 generates an uplink data channel signal (PUSCH) based on the information included in the uplink scheduling grant.
The data channel signal undergoes channel coding in a channel coding/modulation section, not shown, and is output to a Discrete Fourier Transform (DFT) section 147. Then, the signal is subjected to a discrete Fourier transform in the DFT section 147, thus transformed into the frequency domain signal from the time series signal, and is output to the PUSCH mapping section 148. The PUSCH mapping section 148 performs a data channel signal mapping (PUSCH) based on the allocation information resource block included in the uplink A-link scheduling grant.
Then, the mapped data channel (PUSCH) signal is output. to the Inverse Fast Fourier Transform (IFFT) section 145. In the IFFT section 145, in relation to the data channel signal a “15 —from the PUSCH mapping section 1481 and the semi-static SRS a . From the semistatic SRS mapping section 144 or the Dynamic SRS from the Dynamic SRS mapping section 142, the signals are subjected to a fast inverse Fourier transform, thus transformed into the time series signal from of the signals in the frequency domain, and are output to a cyclic prefix addition section 149. The cyclic prefix addition section 149 adds a cyclic prefix to the time series transmission signal.
The transmit signal having a cyclic prefix is sent to the transmit/receive section 13. The transmit signal input to the transmit/receive section 13 is transmitted to the base station apparatus 20 in uplink via the amplification section 12. and transmit/receive antenna 11. Therefore, in mobile station apparatus 10 in accordance with this Embodiment, as the Dynamic SRS is multiplexed into a particular subframe in response to a UL scheduling grant including instructions for transmitting the Dynamic SRS , it is possible to dynamically control a subframe to multiplex the Dynamic SRS, and therefore, as compared to the case of multiplexing the SRS periodically independently.
aware of the presence or absence of PUSCH, it is possible to use efficiently | radio resources used in Dynamic SRS transmission. Fig. 16 is a functional block diagram of the baseband signal processing section 24 that the base station apparatus 20 has in accordance with this Embodiment. Furthermore, for convenience of description, in the baseband signal processing section 24 as shown in Fig. 16, only the configuration related to the reference signal transmission methods according to the invention is shown, however, section 24 is assumed to have a configuration provided in a normal baseband processing section. In a receive signal inserted to the baseband signal processing section 24, a cyclic prefix added to the receive signal. is removed in a CP removal section 240, and the signal is subjected to a Fourier transform in a fast Fourier transform (FFT) section 241, and is transformed into the signal in the frequency domain. Among - the reception signals transformed into the signals in the frequency domain, the reception signal referring to the PUSCH is sent to a demapping section of PUSCH 242, and is demapped in the frequency domain in the demapping section of PUSCH 242.
The receive signal demapped in the PUSCH demapping section 242 is output to an Inverse Discrete Fourier Transform (IDFT) section 245. The Inverse Discrete Fourier Transform (IDFT) section 245 performs Inverse Discrete Fourier Transform (IDFT) processing on the reception signal, and restores the signal in the frequency domain to the signal in the time domain. Then, the receive signal which is the signal in the time domain is demodulated and decoded in a data channel demodulation/decoding section 246, based on the transmission format (encoding rate, encoding scheme). modulation), and the playback data is played.
However, among the reception signals transformed into the information in the frequency domain in the fast Fourier transform section 241, the reception signal referring to the semistatic SRS is output at
39/53 | a semi-static SRS demapping section 243, and the receive signal referring to the Dynamic SRS is sent to a Dynamic SRS demapping section 244. In this case, the receive signal referring to the semi-static SRS is received when the station apparatus mobile 10 is an LTE terminal. Meanwhile, the reception signal referring to the Dynamic SRS is received when the mobile station apparatus 10 is an LTE-A terminal to which the reference signal transmission method according to the invention is applied.
The receive signal referring to the semistatic SRS is demapped from the frequency domain in the semistatic SRS demapping section 243, and is output to a channel quality measurement section on uplink 247. Similarly, the reception signal referring to the SRS .:Dynamic is demapped into the frequency domain in the Dynamic SRS demapping section 244. In the reference signal transmission method according to the fourth aspect of the invention, the information of SRS transmissible subframe are provided to the Dynamic SRS demapping section 244, and the SRS that has been multiplexed into the SRS transmissible subframe is demapped. The demapped SRS is sent to the channel quality measurement section uplink channel quality 247. The uplink channel quality measurement section 247 measures the uplink channel quality based on the receive signal referring to the frequency domain-mapped Semi-Static SRS or Dynamic SRS. Measured channel quality statements are issued to an uplink scheduler 248. The uplink scheduler 248 performs a schedule for the mobile station apparatus 10 to transmit a PUSCH, based on the channel quality information. The scheduling information determined in the uplink scheduler 248 is sent to a scheduling grant signal generation section 249.
For example, when Dynamic SRS is transmitted from mobile station apparatus 10 according to the reference signal transmission method according to the first or second aspect, the uplink channel quality measurement section 247 measures the channel quality based on the Dynamic SRS multiplexed successively (subsequent/before) the PUSCH, and based on the measurement result, the uplink scheduler 248 performs the scheduling. Therefore, it is possible to measure the channel quality in a timing at which the PUS-CH is actually transmitted, and in this way it is possible to perform a schedule- | ment while reflecting the actual channel state. Further, when the Dynamic SRS is transmitted from the mobile station apparatus 10 according to the reference signal transmission method according to the third aspect, the uplink channel quality measuring section 247 measures the quality. It is based on the Dynamic SRS multiplexed before the PUSCH, and based on the measurement result, the uplink scheduler 248 performs a schedule. Therefore, it is possible to measure channel quality at a timing that approximates the timing at which the PUSCH is actually transmitted, while reflecting the scheduling content in a subsequent UL scheduling grant including instructions for Furthermore, when the Dynamic SRS is transmitted from the mobile station apparatus 10 according to the reference signal transmission method according to the fourth aspect, since the SRS is transmitted only in a limited subframe in advance that it does not collide with broadcast information, RRC control information and the like, it is possible to reliably prevent the SRS from colliding with broadcast information, RRC control information and the like.
Further, when the Dynamic SRS is transmitted from the mobile station apparatus 10 in accordance with the reference signal transmission method in accordance with the fifth to eighth aspects, the uplink channel quality measurement section 247 measures the channel quality based on Dynamic SRS multiplexed into a plurality of symbols, and based on the measurement result, the uplink scheduler 248 performs a schedule. Therefore, as compared to the case of multiplexing the SRS on the last symbol only, the
base station 20 is able to properly receive the Dynamic SRS, and is able to properly perform a schedule based on the Dynamic SRS. Still further, when the Dynamic SRS is transmitted to — from the mobile station apparatus 10 in accordance with the reference signal transmission method in accordance with the ninth or tenth aspect, the uplink channel quality measurement section 247 measures channel quality based on Dynamic SRS multiplexed into a symbol in which demodulation accuracy may deteriorate when a data channel signal is transmitted, and based on the measurement result, the uplink scheduler 248 performs an appointment. Therefore, it is possible to efficiently use radio resources while suppressing deterioration in demodulation accuracy of the data channel signal. Particularly when the Dynamic SRS is transmitted from the mobile station apparatus 10 according to the reference signal transmission method according to the tenth aspect, since it is possible to measure the quality Based on the SRS multiplexed in the resource block (Nrg") with a bandwidth including the resource block (Nm) assigned to the mobile station apparatus 10, it is possible to improve the channel quality measurement accuracy.
The scheduling grant signal generation section 249 constitutes the generation section, and based on the scheduling information input from the uplink scheduler 248, generates a UL scheduling grant signal including instructions (schedule identification bit). transmission) for Dynamic SRS transmission. However, when the mobile station apparatus 10 is a terminal supporting the LTE system, the scheduling grant signal generation section 249 generates a UL scheduling grant signal that does not include instructions (transmission identification bit) for Dynamic SRS transmission. Furthermore, the scheduling grant signal generation section 249 is capable of including a part of the SRS multiplexing information in the UL scheduling grant signal. In the signal transmission method of
42/53 | In accordance with the fourth aspect of the invention, section 249 generates a UL scheduling grant indicated by the format as shown in figure 6A or 6B. The UL schedule grant signal generated in the schedule grant signal generation section 249 is transmitted to the mobile station apparatus 10 in downlink via the transmit/receive section 23, the amplification section 22 and the antenna. transmit/receive section 21. Furthermore, the transmit section are comprised of the transmit/receive section 23, the amplification section 22 and the transmit/receive antenna 21.
Therefore, at the base station apparatus 20 in accordance with this Embodiment, since a UL scheduling grant including "instructions for transmitting Dynamic SRS is transmitted to the BR apparatus mobile station 10, it is possible to provide instructions for transmitting Dynamic SRS by the UL scheduling grant, in this way, it is possible “15 —to dynamically control a subframe to multiplex the Dynamic SRS, and therefore it is possible to efficiently use the radio resources used in the SRS transmission.
In addition, the base station apparatus measures channel quality based on the Dynamic SRS multiplexed into a particular subframe in response to the UL scheduling grant including instructions for transmission, performs a PUSCH transmission schedule on the mobile station apparatus 10, thus, is able to measure channel quality at a timing at which the PUSCH is actually transmitted or at a timing close to the timing, and thus is able to perform a schedule while reflecting the actual channel state.
Furthermore, when the Dynamic SRS is multiplexed into a plurality of symbols in a particular subframe, as compared to the case of multiplexing the SRS on the last symbol only, the base station apparatus 20 is able to properly receive the Dynamic SRS, and is capable of performing high-precision scheduling associated with channel quality based on Dynamic SRS.
A modification of the modality of the invention is described below.
tion focused on the difference of the above-mentioned Modality. This modi- | cation is related to transmit power control and ! data channel signal transmission timing (PUSCH) using the scheduling grant for transmitted SRS in the reference signal transmission method according to the eleventh aspect. Furthermore, in this modification, it is assumed that "aperiodic SRS" refers to an SRS of which the transmission timing is dynamically controlled, and that "periodic SRS" refers to an SRS that is periodically transmitted without being dynamically controlled. The "Aperiodic SRS" may be the same as the "Dynamic SRS" of the aforementioned Embodiment, and the "Periodic SRS" may be the same as the "Semi-static SRS" of the aforementioned Embodiment. Furthermore, in this modification, the "grant of SRS.:Aperiodic" is assumed to refer to a scheduling grant for SRS which is transmitted in the reference signal transmission method according to the eleventh aspect. . Fig. 22 is a functional block diagram of the baseband signal processing section 14 that the mobile station apparatus 10 has according to the modification. Furthermore, for convenience of description, in the baseband signal processing section 14 as shown in Fig. 22, only the configuration related to the reference signal transmission method according to the eleventh aspect of the In the invention, however, the section 14 is supposed to be provided with a configuration provided in a normal baseband processing section.
As shown in Fig. 22, a scheduling grant demodulation/decoding section 1400 demodulates and decodes a scheduling grant transmitted from the base station apparatus 20. More specifically, the demodulation section Scheduling Grant Decoding/Decoding 1400 switches the method of interpreting the scheduling grant based on whether or not the demodulated scheduling grant includes instructions for transmitting Aperiodic SRS.
44/53 | For example, when the schedule grant that is demodulated and decoded does not include instructions for transmitting Aperiodic SRS (i.e. "Aperiodic SRS request" is set to "0" as shown in Figure 19A) and the format DCI indicated in a first bit is "0", the scheduling grant demodulation/decoding section 1400 interprets the scheduling grant as the UL scheduling grant shown in Figure 19A, and acquires resource allocation information (resource block assignment and hop resource allocation), modulation/coding scheme information (MCS and RV), relay information (NDI), transmit power control (TPC) information , etc. The demodulation/decoding section of . 1400 schedule grant inserts the schema information. modulation/coding (MCS and RV) and retransmission information (ND!) acquired in a data channel signal generation section "15 1406, insert the radio resource allocation information (assignment of . resource block and hop resource allocation) into a PUSCH 1408 mapping section, and inserts the transmit power control (TPC) information into a transmit power control section
1411.
However, when the schedule grant that is demodulated and decoded includes instructions for transmitting Aperiodic SRS (i.e. "Aperiodic SRS request" is set to "1" as shown in Figure 19B), the demodulation section /schedule grant decoding 1400 interprets the scheduling grant as an Aperiodic SRS grant shown in Fig. 19B , and acquires the transmission bandwidth (TxBW), frequency position, subframe position information (Comb), the degree of cyclic shift (CS), the Extended Transmit Power Control Information (Extended TPC), the Transmission Control Information (TA) Timing, etc.
Scheduling grant demodulation/decoding section 1400 outputs cyclic shift (CS) degree to an Aperiodic SRS signal generation section 1401 outputs transmission bandwidth
45/53 | (TxBW), frequency position, subframe (Comb) position information, and similar to an Aperiodic SRS mapping section 1402, sends the transmission control (TA) timing information to a timing control section of 1410, and sends the Extended Transmit Power Control (Extended TPC) information to a 1411 transmit power control section.
When the degree of cyclic shift (CS) and the like included in the Aperiodic SRS grant is entered from the scheduling grant demodulation/decoding section 1400, the Aperiodic SRS signal generation section 1401 generates the SRS Aperiodic.
The Aperiodic SRS mapping section 1402 maps the 'Aperiodic SRS generated in the signal generation section of Aperiodic SRS: 1401 to radio resources, according to the information included in the Aperiodic SRS grant entered from the demodulation section." 15 —schedule granting/decoding 1400. The Aperiodic SRS mapping section 1402 outputs the Aperiodic SRS mapped to the radio resources to an Inverse Fast Fourier Transform (IFFT) section 1405.
A Periodic SRS signal generating section 1403 generates the Periodic SRS at predetermined intervals. A Periodic SRS mapping section 1404 maps the Periodic SRS generated in the Periodic SRS 1403 signal generation section to radio resources. The Periodic SRS 1404 mapping section emits the Periodic SRS mapped to radio resources to the IFFT 1405 section.
The data channel signal generation section 1406 generates the channel signal! uplink data packet (PUSCH) for transmitting transmission data entered from the upper layer, based on information included in the UL scheduling grant entered from the scheduling grant demodulation/decoding section 1400, and outputs the generated data channel signal to a discrete Fourier transform (DCT) section 1407.
The DCT 1407 section performs transformation processing.
of discrete Fourier in the data channel signal (PUSCH) input from the data channel signal generating section 1406. The DFT section 1407 outputs the data channel signal in the transform frequency domain. from the time domain to the PUSCH mapping section 1408. i The PUSCH mapping section 1408 maps the data channel signal inserted from the DFT section 1407 to the radio resources indicated by the UL scheduling grant input from the scheduling grant demodulation/decoding section 1400. The PUSCH mapping section 1408 outputs the data channel signal mapped to radio resources to the IFFT section 1405. Regarding the channel signal of data inserted from the PUSCH 1408 mapping section r, the Periodic SRS inserted from the Periodic 1404 SRS mapping section, and the Aperiodic SRS inserted from the Aperiodic 1402 SRS mapping section, the section IFFT “15 1405 performs inverse fast Fourier transform processing on . signal.
The IFFT section 1405 outputs the data channel (PUSCH), Periodic SRS or Aperiodic SRS signal in the time domain transformed from the frequency domain to a CP (Cyclic Prefix) addition section 1409 as a transmit signal.
The CP addition section 1409 adds a cyclic prefix to the transmission signal in the time domain inserted from the IFFT section 1405 to send to the transmission timing control section 1410. The transmission timing control section 1410 controls the transmission timing of the transmission signal emitted from the addition section of CP 1409, in accordance with the transmission control information (TA) timing. In the present document, the transmission control information (TA) timing consists of information indicative of the transmission timing of the transmission signal, and is included in a RACH response transmitted from the base station apparatus20 at the time of the initial access of the mobile station apparatus 10. In addition, the timing of transmission control information (TA) is also included in the Aperiodic SRS grant which is transmitted from
47/53 | tir from the base station apparatus 20 at inconstant intervals. When the transmission control information (TA) timing included in the Aperiodic SRS grant is entered from the scheduling grant demodulation/decoding section 1400, the transmission timing control section 1410 controls the transmission timing. are from the transmission signal, according to the transmission control information (TA) timing included in the Aperiodic SRS grant. The transmit power control section 1411 controls the transmit power of the transmit signal, according to the transmit power control (TPC) information or Extended transmit power control (TPC) information. . In the present document, as described above, the transmission power (TPC) control information is the 2-bit information included in the UL scheduling grant, and serves to increase or decrease the “15 transmit power in 4 levels” However, as described above, the Extended Transmit Power Control (Extended TPC) information is the 4-bit information included in the Aperiodic SRS grant, and serves to increase or decrease the transmit power by 16 levels.
More specifically, the transmit power control section 1411 controls the transmit power of the transmit signal in timing | according to the equation below.
Ppuscu(i>amintP, 10/0910, (Meusca(i))+Po puscn(I)+a.PL+Atr (1)+(9i) In this document, P cmax is the maximum transmit power, Meuscu( i) is a transmission bandwidth at timing ii, Po puscn(i) is the target receive power at timing i when the propagation loss is assumed to be equal to "0", a is a pon factor - deration of a fractional TPC, PL is a propagation loss measurement value, Arr (i) is an offset in timing i dependent on the MCS (Modulation and Coding Scheme), and f (() is a correction value at timing i by the above-mentioned transmit power control (TPC) information or by the extended transmit power control (Extended TPC) information. | The transmit power control section 1411 increases ' or decreases the correction value f ( i) in timing i in 4 levels as shown in figure 20A, when the transmission power control (TPC) information included in the concession are entered from the schedule grant demodulation/decoding section 1400. However, the transmit power control section 1411 increases or decreases the correction value f(i) at timing i by 16 levels as shown in Figure 20B, when the Extended Transmit Power Control (Extended TPC) information included in the Aperiodic SRS grant is entered from the Scheduling Grant demodulation/decoding section 1400.
. The transmit signal with the transmit power controlled in the transmit power control section 1411 is fed to the transmit/receive section 13 of figure 13, and is transmitted to the base station 20 through the amplification section. 12 and the transmit/receive antenna 11.
Therefore, in the mobile station apparatus 10 according to the modification, when the transmission of the data channel signal (PUSCH) is suspended and then resumed, the mobile station apparatus 10 is able to properly adjust the transmit power of the data channel signal (PUSCH) after a predetermined time lapse, according to the Extended Transmit Power Control (Extended TPC) information included in the Aperiodic SRS grant transmitted from the station set base 20. Similarly, the mobile station apparatus 10 is able to properly adjust the transmission timing of the data channel signal (PUSCH) after a predetermined time lapse, in accordance with the timing of transmission control information ( TA) included in the Aperiodic SRS grant transmitted from the base station apparatus20.
Fig. 23 is a functional block diagram of the baseband signal processing section 24 that the base station apparatus 20 has. Furthermore, for reasons of convenience of description, in the pro- | baseband signal termination 24 as shown in Fig. 23, | only the configuration related to the reference signal transmission method according to the eleventh aspect of the invention is shown, however, it is assumed that section 24 is provided with a configuration provided in a data processing section. normal baseband.
A CP stripping section 2400 removes a cyclic prefix of an input signal from the baseband signal processing section 24 of Fig. 14 to output to a fast Fourier transform (FFT) section 2401. A The FFT section 2401 performs a fast Fourier transform processing on the reception signal inserted from the reception section of CP 2400. Among the reception signals in the frequency domain transformed from the time domain, the FFT section 2401 sends the receive signal referring to the PUSCH to a demapping section of -PUSCH 2402, sends the receive signal referring to the Periodic SRS to a demapping section of Periodic SRS 2403, and sends the receive signal referring to the Periodic SRS the Aperiodic SRS to an Aperiodic SRS demapping section 2404. The PUSCH demapping section 2402 demaps the receive signal referring to the PUSCH inserted from the FFT section 2401 into | frequency domain. The PUSCH demapping section 2402 outputs the demapped receive signal to an inverse discrete Fourier transform (IDFT) section 2405. The IDFT section 2405 performs inverse discrete fourier transform processing on the input signal input from from the PUSCH demapping section 2402. The IDFT section 2405 sends the time domain receive signal transformed from the frequency domain to a data channel demodulation/decoding section
2405. Data channel demodulation/decoding section 2406 performs demodulation processing and decoding processing.
reception signal input from IDFT section 2405 based on transmission format (modulation scheme, encoding rate). Receive data is reproduced by demodulation processing and decoding processing. i The Periodic SRS demapping section 2403 demaps the receive signal referring to the Periodic SRS inserted from the FFT section 2401 into the frequency domain. The Periodic SRS demapping section 2403 outputs the demapped receive signal to an uplink channel quality measurement section 2407. The Aperiodic SRS demapping section 2404 demaps the receive signal referring to the Aperiodic SRS inserted from there. of section : of FFT 2401 in the frequency domain. The Aperiodic SRS' demapping section 2404 sends the demapped receive signal to the uplink channel quality measurement section 2407. The uplink channel quality measurement section. tooth 2407 measures the uplink channel quality, based on the reception signal referring to the Periodic SRS or the reception signal referring to the Aperiodic SRS. The uplink channel quality measuring section 2407 outputs the measured uplink channel quality to a transmit power/transmit timing control section 2410.
The transmit power control/transmit timing section 2410 generates the transmit power control (TPC) information, the extended transmit power control (Extended TPC) information, and the transmission timing information. transmission control (TA), based on the uplink channel quality entered from the uplink channel quality measurement section 2407. The transmit power control (TPC) information serves to control the power transmission of the uplink data channel (PUSCH) signal at 4 levels based on the uplink channel quality. However, the Extended Transmit Power Control (Extended TPC) information serves to control the transmit power of the Aperiodic SRS and the uplink data channel (PUSCH) signal over an extended control range (e.g., 16 levels) wider than transmit power control (TPC) information, based on uplink channel quality, and are generated when an Aperiodic SRS grant transmit trigger is detected. Like the Aperiodic SRS grant transmit trigger, for example, there is an event in which a scheduling grant signal generation section 2409 receives a scheduling request from the mobile station apparatus 10 after a lapse of time. predetermined time since the last scheduling request (i.e., mobile station apparatus 10 resumes data channel signal suspended transmission (PUSCH)). In addition . transmission control information (TA) timing serves to control the transmission timing of the uplink data channel (PUSCH) signal transmission based on the uplink channel quality. downstream, and is generated when the Aperiodic SRS grant broadcast trigger is detected. Furthermore, the transmit power/transmit timing control section 2410 constitutes the transmit power control section and the transmit timing control section.
An uplink scheduler 2408 performs a schedule for the mobile station apparatus 10 to transmit a PUSCH, based on the uplink channel quality measured in the uplink channel quality measurement section 2407. uplink 2408 outputs the scheduling information determined by the schedule, and the transmit power control (TPC) information, the extended transmit power control (Extended TPC) information, and the timing of transmission control information (TA) determined in the transmit power/transmit timing control section 2410 to the schedule grant signal generation section 2409.
The Scheduling Grant Signal Generation section
2409 constitutes the generation section, and based on the scheduling information entered from the uplink scheduler 2408, generates a scheduling grant.
More specifically, the scheduling grant signal generation section 2409 generates a UL scheduling grant as shown in Fig. 19A, in response to a scheduling request from the mobile station apparatus 10. ! However, the scheduling grant signal generation section 2409 generates an Aperiodic SRS grant as shown in Fig. 19B, when the transmit trigger of the Aperiodic SRS grant as described above is detected.
The UL schedule grant signal or the Aperiodic SRS grant signal generated in the - schedule grant signal generation section 2409 is transmitted. the downlink mobile station apparatus 10 via the transmit/receive section 23, the amplification section 22 and the transmit/receive antenna "15" 21. In addition, the transmit/receive section 23, the amplification 22 and the transmit/receive antenna 21 constitute the transmit section. | Therefore, the base station apparatus 20 according to the modification is capable of measuring the uplink channel quality based on the Periodic SRS which is transmitted periodically from the mobile station apparatus 10, even during a period in which there is no data channel signal (PUSCH) transmitted from the mobile station apparatus 10. Accordingly, the base station apparatus 20 is capable of adjusting the Extended Transmit Power Control (Extended TPC) information, or the Transmission Control (TA) information timing, while reflecting the closest channel state timing at which the station mobile 10 resumes transmitting the data channel signal (PUSCH). Furthermore, the base station apparatus 20 is able to adjust the Extended Transmit Power Control (Extended TPC) information with the increased control range of transmit power, and therefore also when the mobile station apparatus 10 resume the suspended transmission of the data channel signal (PUSCH) (i.e. also when the uplink channel state is significantly different from that of the last transmission of the data channel signal (PUSCH)), is capable of properly adjust the transmit power of the data channel signal (PUSCH) over a wider control range.
In the above-mentioned descriptions, the present invention is specifically described using the above-mentioned Embodiment, however, | it is obvious to a person skilled in the art that the invention is not limited to the Embodiment described in the Description.
The invention is capable of being practiced as modified and altered aspects without departing from the subject matter and scope of the invention defined by the descriptions of the scope of the claims.
Accordingly, the descriptions of the Description are intended for illustrative explanation, and do not have any meaning restrictive to the invention.
The present application is based on Japanese Patent Application "15 —No.2010-030372 filed on February 15, 2010, on Japanese Patent Application No.2010-087380 filed on April 5, 2010, on Application for Japanese Patent No.2010-105940 filed April 30, 2010, and Japanese Patent Application No.2010-141019 filed June 21, 2010, the contents thereof being expressly incorporated herein by reference.

权利要求:
Claims (11)
[1]
1. A method of transmitting a reference signal comprising the steps of: transmitting an uplink scheduling grant including an instruction for transmitting an SRS (Sound Reference Signal) from a base station apparatus; and transmitting an SRS from a mobile station apparatus, in response to instructions for transmitting SRS included in the uplink scheduling grant, wherein the mobile station apparatus transmits the SRS, in a subframe of a PUSCH (Shared Channel of Physical Uplink) that the uplink scheduling grant instructs to transmit in a first SRS-transmittable subframe between the last subframes for a predetermined number of subframes after the PUSCH subframe.
[2]
A reference signal transmission method according to claim 1, wherein the mobile station apparatus transmits the SRS in a subframe immediately preceding the subframe of the PUSCH that the uplink scheduling grant instructs to transmit.
[3]
A reference signal transmission method according to claim 1, wherein the mobile station apparatus transmits the SRS in a previous subframe for the predetermined number of subframes before the PUSCH subframe that the uplink scheduling grant instructs to to transmit.
[4]
4. The reference signal transmission method according to claim 1, wherein the base station apparatus notifies the mobile station apparatus of the resource information for multiplexing the SRS using both uplink scheduling grant and bed signaling - from the top.
[5]
A reference signal transmission method according to claim 1, wherein when the base station apparatus notifies, using the uplink scheduling grant, the mobile station apparatus gives a part of the resource information to multiplexing the SRSs from a plurality of mobile station apparatus including the mobile station apparatus into a same symbol, the resource information portion being notified using another control bit constituting the uplink scheduling grant.
[6]
6. A mobile station apparatus comprising: a receiving section configured to receive an uplink scheduling grant including an instruction for transmitting a Sound Reference Signal (SRS) from a base station apparatus; a transmission section configured to transmit the SRS in a subframe of a Physical Uplink Shared Channel (PUSCH) that the uplink scheduling grant instructs to transmit, or in a first SRS-transmittable subframe of the last subframes for a predetermined number of subframes after the PUSCH subframe.
[7]
A mobile station apparatus according to claim 6, wherein the SRS is multiplexed into a last symbol in the subframe of the PUS-CH that the uplink scheduling grant instructs to transmit.
[8]
A mobile station apparatus according to claim 6, wherein the SRS is multiplexed into a last symbol in a subframe immediately before the PUSCH subframe that the uplink scheduling grant instructs to transmit.
[9]
9. A base station apparatus, comprising: a transmit section configured to transmit an uplink scheduling grant including an instruction for transmitting a Sound Reference Signal (SRS) to a mobile station apparatus; and a receiving section configured to receive the SRS transmitted from the mobile station apparatus in response to the instruction for transmission, wherein the SRS is transmitted from the mobile station apparatus in a subframe of a Shared Channel of Physical Uplink (PUS-CH) that the uplink scheduling grant instructs to transmit either in a first SRS-transmittable subframe among the last subframes for a predetermined number of subframes after the PUSS-CH subframe.
[10]
10. The base station apparatus according to claim 9, wherein the transmit section is configured to transmit resource information for multiplexing the SRS to the mobile station apparatus using both uplink scheduling grant and layer signaling. from the top.
[11]
11. A radio communication system comprising: a base station apparatus having: a transmit section configured to transmit an uplink scheduling grant including an instruction for transmitting a Sound Reference Signal (SRS); and a receiving section configured to receive the SRS transmitted from the mobile station apparatus in response to the instruction for transmission; and a mobile station apparatus having: a receiving section configured to receive an uplink scheduling grant from the base station apparatus; a transmission section configured to transmit the SRS in a subframe of a Physical Uplink Shared Channel (PUSCH) that the uplink scheduling grant instructs to transmit, or in a first subframe transmittable by SRS among the last subframes by a predetermined number - swimming of subframes after the PUSCH subframe.

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法律状态:
2020-09-01| B08F| Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]|Free format text: ARQUIVADO O PEDIDO DE PATENTE, NOS TERMOS DO ARTIGO 86, DA LPI, E ARTIGO 10 DA RESOLUCAO 113/2013, REFERENTE AO NAO RECOLHIMENTO DA 9A RETRIBUICAO ANUAL, PARA FINS DE RESTAURACAO CONFORME ARTIGO 87 DA LPI 9.279, SOB PENA DA MANUTENCAO DO ARQUIVAMENTO CASO NAO SEJA RESTAURADO DENTRO DO PRAZO LEGAL, CONFORME O DISPOSTO NO ARTIGO 12 DA RESOLUCAO 113/2013. |

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2020-12-22| B08K| Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]|Free format text: EM VIRTUDE DO ARQUIVAMENTO PUBLICADO NA RPI 2591 DE 01-09-2020 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDO O ARQUIVAMENTO DO PEDIDO DE PATENTE, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013. |

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2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|

优先权:

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申请号 | 申请日 | 专利标题

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JP2010030372|2010-02-15|

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JP2010-030372|2010-02-15|

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JP2010-087380|2010-04-05|

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JP2010087380|2010-04-05|

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JP2010-105940|2010-04-30|

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JP2010-141019|2010-06-21|

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PCT/JP2011/053079|WO2011099613A1|2010-02-15|2011-02-15|Reference signal transmitting method, mobile station apparatus and base station apparatus|

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