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    • 专利摘要:
    method and apparatus for transmitting and receiving time division duplex frame configuration information in a wireless communication system. a method and apparatus for transmitting and receiving time division duplexing (tdd) configuration information is disclosed. the base station transmits tdd frame configuration information as system information to user equipment via a common control channel in order to dynamically change the tdd frame configuration according to upstream and link traffic conditions to decide. the base station can deliver the same system information to all user equipment in the cell, removing ambiguity in the operation of user equipment (eu) and avoiding interference. compared to an existing method of delivering tdd board configuration information by updating system information, the revealed method enables user equipment to quickly handle traffic changes. moreover, user equipment can receive and apply tdd board configuration information at the same time.
    公开号:BR112013033153B1
    申请号:R112013033153-4
    申请日:2012-06-20
    公开日:2020-09-29
    发明作者:Hyoung Ju Ji；Youn Sun Kim；Young Bum Kim；Joon Young Cho；Seung Hoon Choi
    申请人:Samsung Electronics Co., Ltd；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and apparatus for transmitting and receiving Time Division Duplexing (TDD) configuration information having a dynamic subframe. PREVIOUS TECHNIQUE
    [002] Transmission of Multiplexing by Orthogonal Frequency Division (OFDM) is a scheme of transmission of multiple carriers using multiple carriers for data transmission. In OFDM, a stream of serial input symbols is divided into multiple parallel streams, which are then mapped to multiple orthogonal subcarriers. Each subcarrier is modulated by the corresponding flow with a modulation scheme specified for transmission.
    [003] Multiple carrier modulation was first applied to high frequency military radio in the late 1950s. Although OFDM modulation techniques using multiple orthogonal subcarriers have been developed since the 1970s, practical applications of them have been limited because of the difficulty implementing orthogonal modulation between multiple subcarriers. Significant progress in OFDM applicability was achieved in 1971 (Weinstein and others) when applying Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) for OFDM techniques. Use of DFT and IDFT has made OFDM modulation and demodulation feasible. In addition, the use of safety intervals and insertion of Cyclic Prefix (CP) symbols in safety intervals have significantly reduced negative impacts of multipath reception and delayed spreading in the system.
    [004] Thanks to such technical advances, OFDM techniques have been applied to various digital transmission schemes, such as Digital Audio Broadcast (DAB), Digital Video Broadcast (DVB), Wireless Local Area Network (WLAN) and Mode Wireless Asynchronous Transfer (WATM). That is, use of OFDM techniques was limited in the past because of high hardware complexity, but recent advances in several digital signal processing techniques including Fast Fourier Transform (FFT) and Fast Inverse Fourier Transform (IFFT) have become practical the OFDM implementation.
    [005] Although similar to the existing Frequency Division Multiplexing (FDM), OFDM is highly efficient in high-speed transmission while maintaining orthogonality between multiple tones. Since OFDM exhibits high frequency efficiency and is robust against multipath fading, it can achieve optimum transmission efficiency in high-speed data transmission.
    [006] Additionally, OFDM exhibits high frequency efficiency as it uses frequency spectra in an overlay mode, is robust against frequency selective fading and multipath fading, can reduce Interference Between Symbols (ISI) using a safety interval , can be implemented with an equalizer having a simple hardware structure, and is robust against impulse noise. With these advantages, OFDM is actively used to structure communication systems.
    [007] In wireless communication, adverse channel conditions can prevent high quality data services. Channel conditions in wireless communication can change frequently because of Additive White Gaussian Noise (AWGN), changes in received signal strength because of fading, shading, Doppler effects because of movement and speed changes of user equipment, and interference caused by other users and multipath signals. Consequently, effectively dealing with such adverse channel conditions may be necessary to support high-speed, high-quality data services in wireless communication.
    [008] In OFDM, modulation signals are in a two-dimensional time-frequency resource grid. Time domain features are distinguished by different orthogonal OFDM symbols. Frequency domain features are distinguished by different orthogonal tones. That is, in the time-frequency resource grid, an OFDM symbol on the time axis and a tone on the frequency axis can specify a minimum resource unit that is referred to as a Resource Element (RE). As different resource elements are orthogonal to each other even after passing through frequency selective channels, signals sent through different resource elements can be received on the receiving side without causing interference between them.
    [009] A physical channel is a channel in the physical layer that is used to transmit modulation symbols obtained by modulating one or more encoded bit streams. In an Orthogonal Frequency Division Multiple Access (OFDMA) system, multiple physical channels are created according to the use of information flows to be transmitted or types of receivers. The transmitter and receiver have to make a prior agreement on how to arrange a physical channel on which resource elements (mapping rule).
    [010] A wireless communication system can operate in a Frequency Division Duplexing (FDD) mode or in a TDD mode. In FDD mode, two different frequencies are used for uplink and downlink transmission, and the base station and user equipment can send and receive data at the same time. In TDD mode, the same frequency is used for uplink and downlink transmission, and the base station and user equipment cannot send and receive data at the same time. Consequently, in TDD mode, the base station and user equipment have to make an earlier agreement regarding the transmission time.
    [011] Therefore, there is a need for a method and apparatus for transmitting and receiving TDD frame configuration information in a wireless communication system, in which the base station sends TDD frame configuration information through a pre-defined region. -specified from the common control channel to dynamically change the TDD frame configuration.
    [012] The information given above is presented as prior information only to assist in an understanding of the present revelation. No determination has been made, and no statement is made, as to whether any of the above may be applicable as prior art with reference to the present invention. DISCLOSURE OF THE INVENTION Technical problem
    [013] Aspects of the present invention are to address at least the problems and / or disadvantages mentioned above and to provide at least the advantages described below. Thus, an aspect of the present invention is to provide a method and apparatus for transmitting and receiving Time Division Duplexing (TDD) configuration information in a wireless communication system, in which the base station sends configuration information. TDD frame rate through a pre-specified region of the common control channel to dynamically change the TDD frame configuration, so that the base station can adaptively handle upstream and downlink and interference link traffic conditions caused by the simultaneous transmission of the base station and user equipment because of an error in receiving the control channel from the user equipment can be prevented. Solution to the Problem
    [014] Aspects of the present invention are to address at least the problems and / or disadvantages mentioned above and to provide at least the advantages described below. Thus, an aspect of the present invention is to provide a method and apparatus for transmitting and receiving Time Division Duplexing (TDD) configuration information in a wireless communication system, in which the base station sends configuration information. TDD frame rate through a pre-specified region of the common control channel to dynamically change the TDD frame configuration, so that the base station can adaptively handle upstream and downlink and interference link traffic conditions caused by simultaneous transmission from the base station can be prevented. In accordance with an aspect of the present invention, a method of transmitting TDD frame configuration information to a base station in a wireless communication system is provided. The method includes determining a TDD frame configuration by assigning a transmission direction to a dynamic subframe in a TDD frame, generating system information based on information in the TDD frame configuration, and transmitting the system information by entering the system information on a common control channel.
    [015] The generation of the system information may include making the size of the system information equal to that of the Descent Link Control Information (DCI) for the common control channel. The generation of system information may also include attaching to the system information a Cyclic Redundancy Check (CRC) sequence scrambled with a Temporary Radio Network Identifier (RNTI) defined for TDD frame configuration information. The generation of system information may additionally include aggregating individual TDD board configuration information from multiple carriers used in the wireless communication system to the system information.
    [016] In accordance with another aspect of the present invention, a method of receiving TDD frame configuration information for user equipment in a wireless communication system is provided. The method includes receiving system information on a common control channel, identifying a TDD frame configuration indicating a transmission direction of a dynamic subframe in a TDD frame when analyzing the system information, and using the dynamic subframe according to the direction transmission.
    [017] The system information can have a size equal to that of DCI for the common control channel. Receiving system information may include conducting blind decoding of the common control channel with an RNTI defined for TDD frame configuration information. The system information can be system information created by aggregating individual TDD frame configuration information from multiple carriers used in the wireless communication system.
    [018] In accordance with another aspect of the present invention, an apparatus for transmitting TDD frame configuration information on a base station of a wireless communication system is provided. The apparatus includes a controller for determining a TDD frame configuration by assigning a transmission direction for a dynamic subframe in a TDD frame, a system information generator for generating system information based on information regarding the TDD frame configuration, and a control channel generator for inserting system information into a common control channel for transmission.
    [019] The system information generator can make the size of the system information equal to that of the DCI for the common control channel. The system information generator can attach to the system information a scrambled CRC sequence with a defined RNTI for TDD frame configuration information. The system information generator can add to the system information individual TDD frame configuration information from multiple carriers used in the wireless communication system.
    [020] In accordance with another aspect of the present invention, an apparatus for receiving TDD frame configuration information in a user equipment of a wireless communication system is provided. The apparatus includes a control channel receiver for receiving system information on a common control channel, a system information analyzer for identifying a TDD frame configuration indicating a transmission direction of a dynamic subframe in a TDD frame when analyzing the system information, and a controller to use the dynamic subframe according to its transmission direction.
    [021] The system information can be the same size as the DCI for the common control channel. The control channel receiver can include a blind decoder that conducts blind decoding of the common control channel with an RNTI defined for TDD frame configuration information. When multiple carriers are used in the wireless communication system, system information can be created by aggregating individual TDD frame configuration information from the multiple carriers.
    [022] Other notable aspects, advantages and features of the invention will become apparent to those skilled in the art from the detailed description below, which, considered in combination with the accompanying drawings, reveals exemplary modalities of the invention. ADVANTAGE EFFECTS OF THE INVENTION
    [023] Aspects of the present invention are to address at least the problems and / or disadvantages mentioned above and to provide at least the advantages described below. Thus, an aspect of the present invention is to provide a method and apparatus for transmitting and receiving Time Division Duplexing (TDD) configuration information in a wireless communication system, in which the base station sends configuration information. TDD frame rate through a pre-specified region of the common control channel to dynamically change the TDD frame configuration, so that the base station can adaptively handle upstream and downlink and interference link traffic conditions caused by the simultaneous transmission of the base station and user equipment because of an error in receiving the control channel from the user equipment can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS
    [024] The above and other aspects, features and advantages of certain exemplary embodiments of the present invention will be most apparent from the description below considered in combination with the accompanying drawings, in which:
    [025] Figure 1 illustrates an overview of a wireless communication system according to an exemplary embodiment of the present invention;
    [026] Figure 2 illustrates a structure of Time Division Duplexing (TDD) frames according to an exemplary embodiment of the present invention;
    [027] Figure 3 illustrates a generic control channel information format according to an exemplary embodiment of the present invention;
    [028] Figure 4 illustrates a control channel information format according to an exemplary embodiment of the present invention;
    [029] Figure 5 represents transmission of TDD frame configuration information according to an exemplary embodiment of the present invention;
    [030] Figure 6 illustrates synchronism relationships between reception and application of TDD frame configuration information according to an exemplary embodiment of the present invention;
    [031] Figure 7 illustrates a control channel format for TDD frame configuration information according to an exemplary embodiment of the present invention;
    [032] Figure 8 illustrates a format of a MAC message used to load TDD frame configuration information according to an exemplary embodiment of the present invention;
    [033] Figure 9 is a flow chart of a transmission procedure to a base station according to an exemplary embodiment of the present invention;
    [034] Figure 10 is a flow chart of a reception procedure for user equipment according to an exemplary embodiment of the present invention;
    [035] Figure 11 is a block diagram of a base station according to an exemplary embodiment of the present invention; and
    [036] Figure 12 is a block diagram of user equipment according to an exemplary embodiment of the present invention.
    [037] Throughout the drawings, it should be noted that equal reference numbers are used to represent the same or similar elements, resources and structures. MODES OF THE INVENTION
    [038] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary modalities of the invention as defined by the claims and their equivalences. It includes several specific details to assist in this understanding, but these are to be considered as exemplary only. In this way, persons of ordinary skill in the art will recognize that various changes and modifications to the modalities described in this document can be made without departing from the scope and spirit of the invention. Furthermore, descriptions of well-known functions and constructs may be omitted for clarity and conciseness.
    [039] The expressions and words used in the following description and claims are not limited to bibliographic meanings, and are used by the inventor only to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for purposes of illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalences.
    [040] It is to be understood that the singular forms "one", "one", "o" and "a" include references in the plural unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.
    [041] The term "substantially" means that the characteristic, parameter or reported value does not need to be achieved exactly, but that deviations or variations, including, for example, tolerances, measurement error, limitations of measurement accuracy and other known factors for those skilled in the art, may occur in quantities that do not make it impossible to provide the effect of the characteristic that was intended.
    [042] Figures 1 to 12, discussed below, and the various exemplary modalities used to describe the principles of the present disclosure in this patent document are for illustration only and should not be interpreted in any way that limits the scope of the disclosure. . Those skilled in the art will understand that the principles of the present disclosure can be implemented in any properly arranged communications system. The terms used to describe various modalities are exemplary. It should be understood that these are provided only to assist in understanding the description, and that their uses and definitions in no way limit the scope of the invention. The terms first, second and more are used to differentiate between objects having the same terminology and are not intended in any way to represent a chronological order, except where explicitly reported otherwise. A set is defined as a non-empty set including at least one element.
    [043] The following description focuses on Long Term Evolution (LTE) and Advanced LTE (LTE-A) systems operating in a Time Division Duplexing (TDD) mode. However, exemplary embodiments of the present invention are also applicable to other wireless communication systems supporting base station scheduling and TDD mode operation without significant modification.
    [044] In the LTE system, Multiplexing by Orthogonal Frequency Division (OFDM) is applied for downlink and Multiple Access by Single Carrier Frequency Division (SC-FDMA) is applied for uplink. The LTE system can operate in a Frequency Division Duplexing (FDD) mode or in a TDD mode. During FDD mode, two frequency bands are used for uplink and downlink transmission respectively. During TDD mode, a frequency band is used interchangeably for uplink transmission in one time period and downlink transmission in another time period according to a predefined rule. In TDD LTE mode, radio frames can have seven uplink / downlink configurations. Once the TDD frame configuration is determined in the system, it is rarely changed. To avoid severe interference between uplink transmission and downlink transmission between cells, neighboring cells must have the same TDD frame configuration for synchronization.
    [045] In TDD and FDD modes, a subframe is 1 ms in time and has a wide frequency LTE transmission bandwidth, and includes two time intervals. In the frequency domain, subcarriers (ie, tones) are grouped into Resource Blocks (RBs), which are used as a basic unit for resource allocation. A resource block can include 12 tones in frequency and 14 OFDM symbols in time (interval). Each subframe includes a control channel region for control channel transmission and a data channel region for data channel transmission, and Reference Signals (RSs) for channel estimation are inserted in the control and control channel regions. Dice.
    [046] Since recently, research and development has been conducted on the LTE-A system as an evolved version of the LTE system. In TDD mode of the LTE-A system, similarly to the case of the LTE system, once the TDD frame configuration is determined, it cannot be changed easily, resulting in the inability to dynamically face changes in data traffic. That is, although uplink data traffic will increase significantly over a period of time, unused downlink subframes are not usable for transmitting increased uplink traffic. A problem like this tends to occur in the presence of a cell hierarchy. This is further described with reference to figure 1.
    [047] Figure 1 illustrates an overview of a wireless communication system according to an exemplary embodiment of the present invention. In the wireless communication system, macrocells and picocells are arranged hierarchically in the same area.
    [048] Referring to figure 1, reference numbers 101 and 102 indicate a macrocell and a picocell, respectively. A picocell is typically installed in an area where demand for data traffic is high within the coverage area of a macrocell. In the picocell the transmission power used is less than that used in the macrocell. Even in the same area, demand for data traffic can change dynamically over time. For example, when many users request data reception and Voice over IP (VoIP) reception and transmission, demand for downlink traffic is high and demand for uplink traffic is low. The system then selects a TDD frame configuration that allocates a large number of subframes for the downlink and allocates a small number of subframes for the uplink. Later on, when many users request data transmission and VoIP transmission, there is a rapid increase in demand for the uplink link resource. It is difficult to handle a situation like this with normal system configurations.
    [049] Figure 2 illustrates a TDD frame structure according to an exemplary embodiment of the present invention.
    [050] Referring to figure 2, in a LTE system, a TDD 2 01 radio frame having a length of 10 ms includes two frame halves 202. Each frame half 202 is composed of five subframes 203. Consequently, one TDD radio frame 201 has ten subframes 203, and each subframe 203 is 1 ms in duration. In the LTE system, as shown in Table 1 below, a TDD radio frame can have one of seven configurations according to the number of subframes allocated for the downlink and the uplink.
    [051] In Table 1, 'D' indicates a subframe allocated to the downlink, 'U' indicates a subframe allocated to the downlink, and 'S' indicates a special subframe. For example, in configuration 0, subframes 0 and 5 (marked with 'D') are used for downlink transmission, subframes 2, 3, 4, 7, 8 and 9 (marked with 'U') are used for uphill link transmission, and subframes 1 and 6 (marked with 'S') are special subframes. As indicated by reference number 204, a special subframe consists of three fields: DwPTS, Guard Period (GP) and UpPTS. The DwPTS field is used for downlink transmission, the GP field is not used for transmission, and the UpPTS field is used for uphill link transmission. In a special subframe, as the UpPTS field is small, it is used only to transmit the Physical Random Access Channel (PRACH) and Reference Sound Signal (SRS) and is not used for data or control channel transmission. The GP field is used to guarantee a protection time used to switch from downlink transmission to uplink transmission. Table 1


    [052] Referring to Table 1, some subframes are always used for the same purpose regardless of configuration. For example, subframes 0, 1, 2, 5, 6 and 7 do not change at the 'D', 'S' or 'U' markings for all configurations. Other subframes can change in the 'D', 'S' or 'U' markings according to configuration. In a typical LTE system, once the TDD frame configuration is determined, it does not change easily according to changes in data traffic. At least 80 ms may be required to change the TDD frame configuration as opposed to interference with neighboring cells. This 80 ms time is a time that is required by the user equipment to receive system update information sent by the base station and to update the system information without any reception error. In fact, it can take 100 ms to several seconds to change the TDD frame configuration. Consequently, a scheme to dynamically change the TDD frame configuration must be developed. In a TDD frame, subframes that can dynamically change in descent link / ascent link designation (ie dynamic subframes) are subframes 3, 4, 8, and 9, or subframes 3 and 4.
    [053] To switch the transmission direction in a specific subframe, the user equipment must be notified of the transmission direction in the subframe at a predefined point in time. For downlink link transmission, downlink link scheduling information is effective for the same subframe in which it is transmitted. Consequently, downlink scheduling information indicating that a given subframe is used for downlink transmission can be transmitted in the given subframe. For uphill link transmission, received uphill link scheduling information applies to uphill link transmission at least four subframes later. Consequently, uphill link scheduling information indicating that a given subframe is used for uphill link transmission must be transmitted at least four subframes before the given subframe. Consequently, transmission direction switching can be accomplished by specifying a control channel carrying scheduling information and a subframe to which scheduling information is to be applied.
    [054] However, switching the subframe direction by staggering can cause a problem. A user equipment that is not staggered repeatedly may attempt to control channel decoding on each downlink subframe even when a control channel assigned to the user equipment is not present. This can cause a channel decoding error, which can result in simultaneous transmission by the base station and user equipment at the same time. Consequently, the communication performance of the base station and user equipment may be degraded.
    [055] In an exemplary embodiment of the present invention, TDD frame configuration information indicating subframe directions is sent as part of system information transmitted on the control channel, so that each user equipment can be readily aware of the direction switching subframe. This helps prevent link interference and facilitates rapid system configuration changes.
    [056] Figure 3 illustrates a generic control channel information format according to an exemplary embodiment of the present invention.
    [057] Generally speaking, control channels have the same basic structure independent of common control channels and User Equipment (UE) specific control channels. Referring to figure 3, the control channel information includes a Downlink Control Information (DCI) part 301 and a Cyclic Redundancy Check (CRC) part 302. Here, part DCI 301 is a region for real control channel information, and the CRC 302 part is a region for an error detection sequence. DCI part 301 includes fields 303, 304 and 305 for resource allocation information, channel coding information and for other information. In the case of a common control channel, any user equipment can receive system information in a data channel region indicated by information contained in fields 303 and 304. Here, part CRC 302 contains a CRC value scrambled with a Temporary Identifier Radio Network (RNTI) known to all user equipment, so that any user equipment can receive control channel information. In the case of a specific UE control channel, a specific user equipment can receive a data channel indicated by information contained in fields 303 and 304. Here, part CRC 302 contains a CRC value scrambled with an RNTI known only to one private user equipment, so that only the user equipment can receive the control channel information. As previously described, generic control channel information is transmitted independently of common control channels and UE-specific control channels, and is information used to receive a data channel carrying actual information. Consequently, to deliver updated TDD configuration information in a generalized way, the base station performs data channel scaling on the common control channel and user equipment obtains system information through data channel decoding.
    [058] Figure 4 illustrates a control channel information format according to an exemplary embodiment of the present invention. Here, system information containing TDD frame configuration information is sent on the common control channel.
    [059] Referring to figure 4, differently from the typical control channel information, real system information is sent in the control channel information region. The common control channel information includes a system information part 401 and a CRC 402 part. The system information part 401 includes a TDD configuration field 403 and a reserved field 404. The size of the system information part 401 is set to that of the DCI part 301. The reserved field 404 is used in such a way that system information in the system information part 401 is always the same size. When the size of the 401 system information portion is the same as that of other common control channel information, the user equipment can perform blind control channel decoding by means of CRC verification without too many decryption attempts. Since the DCI 1C format is used to transmit the common control channel in the LTE system, the size of the system information portion 401 is set to the size of the DCI 1C format. In the CRC 402 part, a new RNTI is used to distinguish the proposed control channel information from other control channel information. Table 2 below illustrates RNTIs used in the LTE system. Table 2


    [060] Referring to Table 2, M-RNTI, P-RNTI and SI-RNTI are used for common control channel transmission using the DCI 1C format. In an exemplary embodiment of the present invention, to transmit system information of TDD configuration, one of the FFF4 - FFFC values is assigned to a new TD-RNTI. As shown in Table 3 below, 'FFFC' is designated for TD-RNTI. Table 3

    [061] An exemplary embodiment of the present invention concerns both the transmission of TDD configuration information and control channels delivering system information directly to user equipment without using data channels.
    [062] TDD configuration information in the TDD 403 configuration field notifies user equipment about subframe directions as follows. Table 4 below illustrates an exemplary mode using two bits, which indicate directions for subframes 3 and 4 or subframes 8 and 9 (that is, dynamic subframes described above). For example, information bits '00' may indicate that subframes 3 and 4 or subframes 8 and 9 are used for uphill link transmission. The inverted values of the bit patterns defined in Table 4 can also be used in the same way. As a control channel is indicated by a maximum of two subframes, a period of 5 ms or a multiple of it can be used for TDD mode operation. Table 4

    [063] Table 5 below indicates switching the subframe direction from the up link to the down link. In Table 5, configuration / interval means number / TDD configuration interval. For example, 0/1 indicates TDD setting 0 / odd range, and 0/2 indicates TDD setting 0 / even range. In Table 5, as the number of uphill link subframes differs depending on TDD configurations, the information field can have different numbers of bits. The user equipment identifies the number of bits based on current configuration information. Table 5

    [064] Table 6 below indicates switching from subframe direction from downlink to uplink. In Table 6, as in Table 5, setting / interval means number / setting range TDD. Table 6


    [065] Table 7 below illustrates a scheme indicating subframe directions using four bits. In the case of using 4 bits, a period of 10 ms or a multiple of it can be used for TDD mode operation. Table 7

    [066] When a 4-bit information field as in Table 7 is used twice, a total of 8 bits can be used to indicate directions for eight subframes excluding subframes 0 and 5. In this case, TDD reconfiguration of frame 10 can be performed in a 10 ms period.
    [067] Table 8 below illustrates a scheme using three bits to directly indicate TDD configuration indexes instead of indicating subframe directions. In table 8, the information field indicates a TDD configuration and subframe directions 15 are the same as in Tables 4 to 7. Table 8
    Figure 5 represents transmission of control channel for TDD configuration information according to an exemplary embodiment of the present invention.
    [068] Referring to figure 5, the directions of subframes 3, 4, 8 and 9 can change frequently according to TDD frame configurations, and subframes 3, 4, 8 and 9 are not suitable for transmission channel. common control. Among the remaining subframes, subframes 0, 10 1, 5 and 6 can be used for downlink link control channel transmission. In the case of using a 5 ms period, as indicated by reference number 511 in figure 5, the user equipment must receive the control channel in subframe 0 indicated by reference number 15 501 and in subframe 5 indicated by the number of reference 502. To allow other control channel transmissions using limited common control channel resources, as indicated by reference number 521, TDD configuration information can be transmitted in subframe 1 indicated by reference number 503 and subframe 6 indicated by reference number 504. In an exemplary embodiment of the present invention, as indicated by reference number 531, subframes 0, 1, 5 and 6, indicated by reference numbers 505, 506, 507 and 508, respectively, can be pre-specified as candidates and the user equipment is directed to try to receive the new control channel in the pre-specified subframes. In another exemplary embodiment of the present invention, a period and displacement are provided so that the user equipment is allowed to receive the new control channel only in one of the subframes 0, 1, 5 and 6, indicated by reference numbers 505, 506, 507 and 508, respectively. When the period is 10 ms and the offset, indicated by reference number 509, is 3, as indicated by reference number 541, TDD configuration information can be transmitted in subframe 6 indicated by reference number 510 between the four subframes available.
    [069] Figure 6 illustrates synchronism relationships between reception and application of TDD frame configuration information according to an exemplary embodiment of the present invention.
    [070] Referring to figure 6, as indicated by reference number 601, when a direction switching indication is received in subframe 0 or 1, indicated by reference number 604, direction switching can be performed later for transmission of both the downlink and the uplink, as indicated by reference number 605. This takes into account the time required for the user equipment to receive actual scheduling information after receiving the corresponding switching indication. That is, a direction switching indication received in a subframe is made in a dynamic subframe at least four subframes later.
    [071] In another exemplary embodiment of the present invention, as indicated by reference number 602, a direction switching indication, indicated by reference number 606, can be carried out at a later time for a link subframe descent, indicated by reference number 607, and can be carried out later for an uphill link subframe, indicated by reference number 608. A descent link subframe can be switched to an uphill link subframe immediately after direction switching indication since scheduling information is not required, and an uplink subframe can be switched to a downlink subframe at least four subframes in a row since scheduling information is required. That is, switching from downlink to uplink is performed in a dynamic subframe close to the subframe in which the corresponding indication is received, and switching from uplink to downlink is performed in a dynamic subframe of at least four more subframes. late from the subframe in which the corresponding indication is received.
    [072] In another exemplary embodiment of the present invention, as indicated by reference number 603, when a direction switching indication, indicated by reference number 609, is transmitted in subframe 0 or 5, it can be applied to a uphill link subframe being the last subframe in the same frame half while allowing a delay of at least four subframes, as indicated by reference number 611. This corresponds to the earlier application of the switching indication, as indicated by the number of reference 610. That is, switching from the downlink to the uplink is performed from a dynamic subframe within the time of the four subframes from the subframe in which the corresponding indication is received, and switching from the uplink to the downlink is from a dynamic subframe at least four subframes later from the subframe in which the corresponding indication is received.
    [073] Figure 7 illustrates a control channel format for TDD frame configuration information according to an exemplary embodiment of the present invention. Here, TDD frame configuration information for multiple cells is aggregated.
    [074] Referring to figure 7, a scheme is shown in which TDD configuration changes of different cells are notified by a cell. A user device can use multiple carriers, which are treated as separate cells. When carriers are sufficiently separated in frequency, cells can have different TDD frame configurations and can change TDD frame configurations individually. However, to allow user equipment to dynamically obtain configuration information, a cell may need to transmit configuration information from other cells. In figure 7, reference number 701 indicates a piece of system information, in which TDD configuration information 703 to 705 of multiple cells is linked in the order of installed cells. In this case, the size of the system information part 701 must be equal to the total size of the common control channel, that is, the size of the DCI 1C format, as indicated by reference number 707, in the LTE system. The reserved field 706 and the CRC 702 part are formed in the same way as in figure 4.
    [075] In another exemplary embodiment of the present invention, the base station can send a MAC header containing TDD frame configuration information to user equipment via a data channel. During data channel scheduling, the base station can transmit a MAC header containing the information field described above, and a user device can identify a new TDD frame configuration or subframe direction if it successfully receives the data channel. staggered data.
    [076] A MAC header containing TDD frame configuration information can be contained not only in a data channel that is sent by the base station to the user equipment, but also in a data channel that is sent by the user equipment to the base station. Consequently, information regarding the current TDD frame configuration of the user equipment can be sent back to the base station. This can complement information transmission through the common control channel, where it is difficult for the base station to determine whether the information sent is successfully received by all user devices involved. That is, the base station can use this scheme to ensure that all user equipment involved uses a new TDD frame configuration.
    [077] Figure 8 illustrates a format of a MAC message used to load TDD frame configuration information according to an exemplary embodiment of the present invention.
    [078] Referring to figure 8, the MAC message for a data channel includes a MAC header 801 at the beginning. The MAC header 801 includes multiple subheadings 809. A subheader 809 can have a Reserved field (R) 811, an extension field (E) 813 and a Logical Channel Identifier (LCID) field 815 for indicating the type of subheader. The LCID 815 field has a size of 5 bits for uplink and downlink.
    [079] In addition to the MAC header 801, the MAC message includes the MAC 803 control elements (that is, corresponding in sequence and number to subheadings 809 in the MAC header 801), the MAC 805 SDUs and the padding 807. A MAC message can contain information to be transmitted in a sub-header and associated MAC control element. Consequently, TDD frame reconfiguration information can be sent to the user equipment via a MAC header. Table 9 below illustrates LCID values for downlink transmission. Here, the LCID value "11010" is designated for TDD reconfiguration information. Table 9


    [080] When the base station requests information regarding the current TDD configuration of a user device, the user device can send current TDD configuration information to the base station via a MAC message. Table 10 below illustrates LCID values for uphill link transmission. Here, an LCID value of "11000" is assigned for TDD configuration reporting. Table 10


    [081] As shown in figure 8, a MAC control element having a size of 1 byte, as indicated by reference number 817, can be used for transmitting TDD frame configuration information. A MAC control element like this can contain an 8-bit information field, as indicated by reference number 819, indicating directions for subframes 1, 2, 3, 4, 6, 7, 8 and 9 (excluding subframes 0 and 5).
    [082] Figure 9 is a flow chart of a transmission 10 procedure to a base station according to an exemplary embodiment of the present invention.
    [083] Referring to figure 9, the base station transmits TDD frame configuration information as system information to the user equipment in step 902. The base station then creates a system information element having a size equal to size of DCI 1C format to contain TDD frame reconfiguration information in step 903. In step 904, the base station attaches a scrambled CRC sequence with TD-RNTI to the system information element. The base station transmits the system information element together with the CRC sequence by allocating the proposed control channel in the common control channel region of a subframe determined according to a predefined period and offset or other rule in step 905. The station base performs subframe direction switching considering a synchronism relationship between the reconfiguration indication and its application, scaling down link transmission and up link transmission according to subframe direction switching, delivers the scheduling information to the user equipment, and performs data channel transmission and reception to and from the user equipment in step 906.
    [084] In other words, the base station determines a TDD frame configuration. Here, the base station determines directions for dynamic subframes in the TDD frame according to traffic conditions. The base station generates system information based on the TDD frame configuration information. Here, the size of the system information is made equal to the size of the DCI 1C format by adding an appropriate number of reserved bits. The base station attaches a scrambled CRC sequence with TD-RNTI to the system information. If necessary, TDD frame configuration information from multiple carriers can be added to the system information. The base station transmits the system information by inserting the system information into the common control channel. The base station then communicates with user equipment according to the updated TDD frame configuration.
    [085] Figure 10 is a flow chart of a reception procedure for user equipment according to an exemplary embodiment of the present invention.
    [086] Referring to figure 10, the user equipment receives TDD frame configuration information as system information from the corresponding base station in step 1002. To achieve this, the user equipment attempts blind decoding, using TD-RNTI, in the common control channel region of a subframe determined according to a predefined period and offset or other rule in step 1003. The user equipment identifies TDD frame configuration information from successfully decoded data in step 1004. The user equipment performs data channel control and reception or performs uphill link data channel transmission considering the indication time and application time of the configuration information in step 1005.
    [087] In other words, the user equipment receives system information on the common control channel. To achieve this, the user equipment performs blind decoding on the common control channel using TD-RNTI defined for TDD configuration system information. Here, the size of the system information is the same as that of the DCI 1C format, and multi-carrier TDD frame configuration information can be added to the system information. The user equipment identifies a TDD frame configuration by analyzing the system information. The user equipment determines transmission directions for dynamic subframes in the TDD frame. The user equipment communicates with the base station according to the updated TDD frame configuration. Here, dynamic subframes are used according to their transmission directions.
    [088] Figure 11 is a block diagram of a base station according to an exemplary embodiment of the present invention.
    [089] Referring to figure 11, the base station includes a TDD 1101 radio frequency (RF) unit, a dynamic TDD switch 1102, a transmission manipulator 1103, a receiving manipulator 1104, a controller 1105, a channel generator control 1106, a system information attacher 1107, a system information generator 1108, a control information generator (s) 1109 and a control information attacher 1110.
    [090] The RF TDD 1101 unit performs radio communication to the base station. The TDD 1101 RF unit performs downlink transmission or uplink reception. The dynamic TDD switch 1102 controls the RF TDD unit 1101 to switch between uplink and downlink operations according to predefined escalation times. Transmission manipulator 1103 processes a signal to be transmitted by means of downlink transmission. The reception handler 1104 processes a signal received by means of uphill link reception. Controller 1105 determines a TDD frame configuration. Here, controller 1105 determines transmission directions (i.e., up link or down link) from dynamic subframes.
    [091] Controller 1105 controls radio communication according to the TDD frame configuration. Here, controller 1105 determines whether to switch transmission directions of dynamic subframes in the TDD frame, and controls switching of transmission direction of dynamic subframes.
    [092] System information generator 1108 generates system information using TDD board configuration information. Here, the size of the system information is made equal to that of the DCI 1C format. The system information generator 1108 can generate system information by aggregating TDD frame configuration information from multiple carriers. The system information attacher 1107 attaches a scrambled CRC sequence with TD-RNTI to the system information. The control information generator (s) 1109 generates DCI. The control information attacher 1110 attaches a scrambled CRC sequence with RNTI to the downlink control information. The control channel generator 1106 generates a control channel using system information and downlink control information. That is, the control channel generator 1106 sends system information and downlink link information by inserting them into the common control channel.
    [093] Figure 12 is a block diagram of user equipment according to an exemplary embodiment of the present invention.
    [094] Referring to figure 12, the user equipment includes a control channel receiver 1201, a blind decoder 1202, a system information analyzer 1203, a control information analyzer 1210, an RNTI storage 1204, a controller 1205, an RF TDD unit 1206, a dynamic TDD switch 1207, a transmission handler 1208 and a receive handler 1209.
    [095] The RF TDD 1206 unit performs radio communication to the user equipment. That is, the TDD 1206 RF unit performs downlink reception or uplink transmission. The dynamic TDD switch 1207 controls the RF TDD unit 1206 to switch between uplink and downlink operations according to predefined escalation times. Transmission manipulator 1208 processes a signal to be transmitted by means of uphill link transmission. Reception handler 1209 processes a signal received by way of downlink reception. Controller 1205 determines whether to switch transmission directions (i.e., up link or down link) of dynamic subframes in the TDD frame based on TDD frame configuration information. Controller 1205 controls radio communication according to the TDD frame configuration, and controls transmission direction switching of dynamic subframes in the TDD frame.
    [096] Control channel receiver 1201 performs control channel reception. The blind decoder 1202 receives the common control channel and UE-specific control channel by blindly decoding the control channel using RNTIs. The blind decoder 1202 receives system information on the common control channel using TD-RNTI, and receives downlink control information on the common control channel using other RNTIs. Here, the system information and downlink control information are the same size. The RNTI 1204 store stores various types of RNTIs. The system information analyzer 1203 analyzes system information to identify a TDD frame configuration, and determines transmission directions (i.e., up link or down link) from dynamic subframes. The control information analyzer 1210 analyzes downlink control information to identify scheduling information.
    [097] In an exemplary embodiment of the present invention, the method and apparatus for transmitting and receiving TDD frame configuration information enables the base station to send TDD frame configuration information as system information via the common control channel. In this way, the base station can dynamically change the TDD frame configuration according to changes in uplink and downlink traffic conditions. In addition, it is possible to prevent interference between user equipment uplink transmission and base station downlink transmission.
    [098] Although the invention has been described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in shape and detail can be made to it without departing from the spirit and scope of the present invention as defined in the claims annexes and their equivalences.
    权利要求:
    Claims (26)
    [0001]
    1. Method of transmitting Time Division Duplexing (TDD) configuration information to a base station in a wireless communication system, the method characterized by the fact that it comprises: identifying a Temporary Radio Network Identifier (RNTI) for TDD configuration information; generate a Descent Link Control Information (DCI) comprising the TDD configuration information; and attach a Cyclic Redundancy Check (CRC) sequence scrambled with RMTI for DCI; and transmitting control information generated based on the DCI on a common control channel, where the TDD configuration information indicates a radio frame including a downlink subframe, an uplink subframe and a special subframe.
    [0002]
    2. Method according to claim 1, characterized by the fact that the DCI comprises 3-bit information to indicate one of a plurality of up / down link configurations.
    [0003]
    3. Method according to claim 1, characterized by the fact that a DCI format corresponds to a DCI 1C format.
    [0004]
    4. Method according to claim 1, characterized by the fact that a DCI size corresponds to a size of the DCI 1C format.
    [0005]
    5. Method, according to claim 1, characterized by the fact that generating the DCI additionally comprises multiplexer multiple TDD configuration indicators in a DCI to indicate individual TDD configuration information for multiple carriers.
    [0006]
    6. Method, according to claim 1, characterized by the fact that it further comprises: generating configuration information comprising subframe information to receive the DCI; and transmitting the configuration information to a user device, where the subframe information is associated with a DCI monitoring period.
    [0007]
    7. Method of receiving Time Division Duplexing (TDD) configuration information for user equipment in a wireless communication system, the method characterized by the fact that it comprises: identifying a Temporary Radio Network Identifier (RNTI) for TDD configuration information; receive Descent Link Control Information (DCI) attached with a Cyclic Redundancy Check (CRC) sequence scrambled with the RNTI on a common control channel, the DCI comprising TDD configuration information; identify TDD configuration information; and transmitting or receiving data according to the TDD configuration information, wherein the TDD configuration information indicates a radio frame including a downlink subframe, an uplink subframe and a special subframe.
    [0008]
    8. Method, according to claim 7, characterized by the fact that receiving the DCI additionally comprises conducting a blind decoding of the common control channel with the RNTI.
    [0009]
    9. Method according to claim 7, characterized by the fact that the DCI comprises information of 3 bits to indicate one of a plurality of up / down link configurations.
    [0010]
    10. Method according to claim 7, characterized in that a DCI format corresponds to a DCI 1C format.
    [0011]
    11. Method according to claim 7, characterized in that a DCI size corresponds to a size of the DCI 1C format.
    [0012]
    12. Method according to claim 7, characterized by the fact that the DCI comprises multiple TDD configuration indicators to indicate individual TDD configuration information for multiple carriers.
    [0013]
    13. Method according to claim 7, characterized by the fact that it further comprises: receiving configuration information comprising subframe information to receive the DCI, wherein the subframe information is associated with a DCI monitoring period.
    [0014]
    14. Base station for transmitting Time Division Duplexing (TDD) configuration information in a wireless communication system, the base station characterized by the fact that it comprises: a transceiver; and a controller coupled to the transceiver and configured to: identify a Temporary Radio Network Identifier (RNTI) for TDD configuration information, generate Descent Link Control Information (DCI) comprising TDD configuration information, attach a sequence of the Cyclic Redundancy Check (CRC) scrambled with the RNTI to the DCI, and transmit control information generated based on the DCI on a common control channel, where the TDD configuration information indicates a radio frame including a subframe downlink link, an uplink subframe and a special subframe.
    [0015]
    15. Base station according to claim 14, characterized by the fact that the DCI comprises 3-bit information to indicate one of a plurality of up / down link configurations.
    [0016]
    16. Base station according to claim 14, characterized by the fact that a DCI format corresponds to a DCI 1C format.
    [0017]
    17. Base station according to claim 14, characterized by the fact that a size of the DCI corresponds to a size of the DCI 1C format.
    [0018]
    18. Base station, according to claim 14, characterized by the fact that the controller is configured to multiplex multiple TDD configuration indicators in a DCI to indicate individual TDD configuration information from multiple carriers.
    [0019]
    19. Base station, according to claim 14, characterized by the fact that the controller is configured to generate configuration information comprising subframe information to receive the DCI and to transmit the configuration information to a user equipment, in which the Subframe information is associated with a DCI monitoring period.
    [0020]
    20. User equipment for transmitting Time Division Duplexing (TDD) configuration information in a wireless communication system, the user equipment characterized by the fact that it comprises: a transceiver; a controller coupled to the transceiver and configured to: identify a Temporary Radio Network Identifier (RNTI) for TDD configuration information, receive Downlink Control Information (DCI) attached with a Cyclic Redundancy Check (CRC) sequence ) scrambled with the RNTI on a common control channel, the DCI comprising the TDD configuration information, identifying the TDD configuration information, and transmitting or receiving data according to the TDD configuration information, in which the configuration information of TDD TDD indicates a radio frame including a downlink subframe, an uplink subframe and a special subframe.
    [0021]
    21. User equipment according to claim 20, characterized by the fact that the controller is configured to conduct blind decoding of the control channel common with the RNTI.
    [0022]
    22. User equipment according to claim 20, characterized by the fact that the DCI comprises 3-bit information to indicate one of a plurality of up / down link configurations.
    [0023]
    23. User equipment according to claim 20, characterized by the fact that a DCI format corresponds to a DCI 1C format.
    [0024]
    24. User equipment according to claim 20, characterized in that a DCI size corresponds to a size of the DCI 1C format.
    [0025]
    25. User equipment according to claim 20, characterized by the fact that the DCI comprises multiple TDD configuration indicators to indicate individual TDD configuration information for multiple carriers.
    [0026]
    26. User equipment according to claim 20, characterized in that the controller is configured to receive configuration information comprising subframe information to receive DCI, in which the subframe information is associated with a monitoring period of the DCI.
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-08-04| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-08-04| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 27/26 , H04B 7/26 , H04L 1/00 Ipc: H04B 7/26 (2006.01), H04L 27/26 (2006.01), H04L 1/ |
    2020-09-29| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/06/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    KR10-2011-005972|2011-06-20|
    KR20110059727|2011-06-20|
    KR1020120049056A|KR102031031B1|2011-06-20|2012-05-09|Method and apparatus for transmitting and receiving time division duplex frame configuration information in wireless communication system|
    KR10-2012-0049056|2012-05-09|
    PCT/KR2012/004858|WO2012177037A2|2011-06-20|2012-06-20|Method and apparatus for transmitting and receiving time division duplex frame configuration information in wireless communication system|
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