Devices for determining a subframe of reference for reporting feedback and determining a feedback mo

专利摘要:
DEVICES FOR DETERMINING A SUB-FRAME OF REFERENCE FOR REPORTING FEEDBACK AND DETERMINING A MODE OF FEEDBACK. A wireless communication device for determining a subframe of reference is described. The wireless communication device includes a processor and instructions stored in memory that are in electronic communication with the processor. The wireless communication device determines a reporting subframe n. The wireless communication device also determines a subframe of reference based on a threshold and at least one threshold criterion. The wireless communication device additionally generates a report based on the reference subframe if the reference subframe is determined. The wireless communication device additionally sends the report during the reporting subframe if the reference by-product is determined.
公开号:BR112013007300B1
申请号:R112013007300-4
申请日:2011-10-04
公开日:2022-02-15
发明作者:Wanshi Chen；Peter Gaal；Tao Luo；Juan Montojo
申请人:Qualcomm Incorporated；
IPC主号:

专利说明:

[001] This application refers to and claims priority of the U.S. provisional patent application. At the. 61/389,591, filed on October 4, 2010, for “DETERMINING A REFERENCE SUBFRAME”. Technical Field
[002] The present description generally refers to electronic devices. More specifically, the present description relates to devices for determining a subframe of reference and determining a mode. Fundamentals
[003] In the last several decades, the use of electronic devices has become commonplace. In particular, advances in electronic technology have reduced the cost of increasingly complex and useful electronic devices. Cost reduction and consumer demand have proliferated the use of electronic devices so that they are practically indispensable in modern society. As the use of electronic devices has expanded, so has the demand for new and improved accessories for electronic devices. More specifically, electronic devices that perform functions faster, more efficiently, or with higher quality are often sought after.
[004] Some electronic devices (eg cell phones, smart phones, computers etc.) communicate with other electronic devices. For example, a cell phone can communicate wirelessly with a base station by transmitting and receiving electromagnetic signals over the air.
[005] The quality of communications between wireless communication devices depends on the quality of the channel used to transmit and receive signals. For example, channel interference can degrade communication quality. Some electronic devices (eg wireless communication devices) use feedback to improve the quality of communication. For example, a cell phone can send feedback to a base station, indicating measurements that the base station can use to improve link quality. As can be seen from this discussion, systems and methods that improve feedback can be beneficial. summary
[006] A wireless communication device for determining a subframe of reference is described. The wireless communication device includes a processor and instructions stored in memory that are in electronic communication with the processor. The wireless communication device determines a reporting subframe n. The wireless communication device also determines a subframe of reference n - nreference based on a threshold and at least one limiting criterion. The wireless communication device additionally generates a report based on the reference subframe if the reference subframe is determined. The wireless communication device additionally sends the report during the reporting subframe if the reference subframe is determined.
[007] Threshold can be 4 and nreference can be a value less than or equal to the threshold that corresponds to a valid downlink subframe. The at least one limiting criterion may include aperiodic triggering. The at least one limiting criterion may also include an upper limit.
[008] Threshold can be L and nreference can be a smaller value greater than and equal to the threshold that corresponds to a valid downlink subframe. The at least one limiting criterion may include limiting L to a difference between a reporting subframe n and a downlink control information subframe. The at least one limiting criterion may also include an upper limit.
[009] Threshold can be 4 and nreference can be a smaller value greater than or equal to the threshold that corresponds to a valid downlink subframe. The at least one limiting criterion may include limiting nreference to a value that is less than or equal to a difference between the reporting subframe n and a downlink control information subframe.
[0010] Threshold can be 4 and nreference can be a smaller value greater than or equal to the threshold that corresponds to a valid downlink subframe. The at least one delimiting criterion may include limiting nreference to a value such that n-nreference corresponds to a subframe number of downlink control information or corresponds to a predetermined subframe number.
[0011] Threshold can be k and nreference can be the smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe. The at least one delimiting criterion may include limiting the reference to a value that is less than or equal to a difference between the reporting subframe n and a downlink control information subframe. k can be limited to a minimum value.
[0012] Threshold can be k and nreference can be a smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe. The at least one delimiting criterion may include a downlink subframe that includes a channel state information reference signal.
[0013] Threshold can be k1 and nreference can be greater than or equal to threshold and can correspond to a valid downlink first subframe. The at least one limiting criterion may include a channel status information reference signal. The wireless communication device may also determine a second subframe of referencen-nreference2 based on a second threshold. The second threshold can be k2 and nreference2 can be greater than or equal to the second threshold and can correspond to a valid second downlink subframe.
[0014] Threshold can be k and nreference can be the smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe. The at least one delimiting criterion may include a downlink subframe that is a given subframe type.
[0015] Threshold can be k1 and nreference can be a smaller value greater than or equal to the threshold that corresponds to a valid downlink subframe of a given subframe type. The wireless communication device may also determine a second subframe of reference n-n-reference2 based on a second threshold. The second threshold can be k2 and nreference2 can be a value greater than or equal to the second threshold that corresponds to a valid second downlink subframe.
[0016] A base station for determining a mode is also described. The base station includes a processor and instructions stored in memory that are in electronic communication with the processor. The base station determines a feedback mode. The base station sends a feedback mode indicator. The base station also sends a reference signal. The base station additionally receives feedback.
[0017] The reference signal can be a common reference signal (CRS). The reference signal may be a channel state information reference signal (CSI-RS).
[0018] A method of determining a reference subframe in a wireless communication device is also described. The method includes determining a reporting subframe n. The method also includes determining an n-reference subframe based on a threshold and at least one limiting criterion. The method additionally includes generating a report based on the reference subframe if the reference subframe is determined. The method additionally includes sending the report during the reporting subframe if the reference subframe is determined.
[0019] A method of determining a mode on a base station is also described. The method includes determining a feedback mode. The method also includes sending a feedback mode indicator. The method additionally includes sending a reference signal. The method additionally includes receiving feedback.
[0020] An apparatus for determining a reference subframe is also described. The apparatus includes mechanisms for determining a reporting subframe n. The apparatus also includes mechanisms for determining an n-reference subframe based on a threshold and at least one limiting criterion. The apparatus further includes mechanisms for generating a report based on the reference subframe if the reference subframe is determined. The apparatus further includes mechanisms to send report during the reporting subframe if the reference subframe is determined.
[0021] An apparatus for determining a mode is also described. The apparatus includes mechanisms for determining a feedback mode. The apparatus also includes mechanisms for sending a feedback mode indicator. The apparatus additionally includes mechanisms for sending a reference signal. The apparatus additionally includes mechanisms for receiving feedback.
[0022] A computer program product for determining a subframe of reference is also described. A computer program product includes a tangible, non-transient computer-readable medium with instructions. The instructions include code to make a wireless communication device determine a reporting subframe n. The instructions also include code to cause the wireless communication device to determine an n-reference subframe based on a threshold and at least one threshold criterion. The instructions further include code to cause the wireless communication device to generate a report based on the subframe of reference if the subframe of reference is determined. The instructions additionally include a code to cause the wireless communication device to send the report during the reporting subframe if the reference subframe is determined.
[0023] A computer program product for determining a mode is also described. The computer program product includes a tangible, non-transient computer-readable medium with instructions. The instructions include code to have a base station determine a feedback mode. The instructions also include code to make the base station send a feedback mode indicator. The instructions additionally include a code to make the base station send a reference signal. The instructions additionally include a code to make the base station receive feedback. Brief Description of Drawings
[0024] Figure 1 is a block diagram illustrating a configuration of a wireless communication device where systems and methods for determining a subframe of reference can be implemented;
[0025] Figure 2 is a diagram illustrating a series of subframes;
[0026] Figure 3 is a flowchart illustrating a configuration of a method for determining a reference subframe in a wireless communication device;
[0027] Figure 4 is a flowchart illustrating an example of a method for determining a reference subframe;
[0028] Figure 5 is a flowchart illustrating another example of a method for determining a reference subframe;
[0029] Figure 6 is a flowchart illustrating another example of a method for determining a reference subframe;
[0030] Figure 7 is a flowchart illustrating another example of a method for determining a reference subframe;
[0031] Figure 8 is a flowchart illustrating another example of a method for determining a reference subframe;
[0032] Figure 9 is a flowchart illustrating another example of a method for determining a reference subframe;
[0033] Figure 10 is a flowchart illustrating another example of a method for determining a reference subframe;
[0034] Figure 11 is a flowchart illustrating another example of a method for determining a reference subframe;
[0035] Figure 12 is a flowchart illustrating another example of a method for determining a reference subframe;
[0036] Figure 13 is a flowchart illustrating a configuration of a method for determining a mode in a base station;
[0037] Figure 14 is a block diagram illustrating a configuration of a wireless communication device in which the systems and methods for determining a subframe of reference can be implemented;
[0038] Figure 15 illustrates certain components that can be included within a wireless communication device; and
[0039] Figure 16 illustrates certain components that can be included within a base station. Detailed Description
[0040] It should be noted that the systems and methods described here may be described in terms of one or more specifications, such as the 3a Partnership Project. Generation (3GPP) Version 8 (Rel-8), 3GPP Version 9 (Rel-9), 3GPP Version 10 (Rel-10), Long Term Evolution (LTE), Advanced LTE (LTE-A), etc. However, at least some of the concepts described here can be applied to other wireless communication systems. For example, the term User Equipment (UE) may be used to refer to the more general term “wireless communication device”. Additionally, one or more terms Node B, Evolved Node B (eNB), Evolved Domestic Node B (HeNB), etc. may be used to refer to the more general term “base station”.
[0041] In one configuration, the systems and methods described here may describe the determination of a measurement or reference subframe for the Channel Quality Indicator (CQI)/Channel State Information (CSI) (e.g. feedback) reporting in LTE-A. In version 8 and version 9, both periodic and aperiodic Channel Quality Indicator, Precoding Matrix Indicator and/or Ranking Indicator (CQI/PMI/RI) reporting are supported. While the systems and methods may be described in CQI terms for understanding, the systems and methods described here may be similarly applicable to PMI and/or RI.
[0042] Each report is measured against the same reference resource (eg frequency and time feature, for example). From a timing perspective (for a channel quality report in subframe n, for example), the reference resource can be defined or determined by a single n-nreference downlink subframe (e.g. n-nCQI-ref)a , where n is a subframe number. In some configurations, a radio frame can include 10 subframes. According to current specifications, for periodic CQI reporting, nCQI-ref is the smallest value greater than or equal to 4 so that it corresponds to a valid downlink subframe. Additionally, for aperiodic CQI reporting, nCQI-ref is such that the referencing resource is in the same valid downlink subframe as the corresponding CQI request in a downlink control information (DCI) 0 format. Additionally, for aperiodic CQI reporting , nCQI-ref is equal to 4 and the downlink subframe n-nCQI-ref corresponds to a valid downlink subframe, where the downlink subframe n-nCQI-ref is received after the subframe with the corresponding CQI request in a Grant of Response to Random Access.
[0043] In some configurations, a downlink subframe may be considered “valid” if it is configured as a downlink subframe for that wireless communication device (e.g. UE), it is not a Multicast/Broadcast over Single subframe Frequency Network (MBSFN), does not contain a Downlink Pilot Time Partition (DwPTS) field (in this case the DwPTS length is 7680*Ts and less) and is not within a measurement space configured for that device of wireless communication (eg UE). If there is no valid downlink subframe for the CQI reference resource, the CQI report is omitted in uplink subframe n.
[0044] For aperiodic CQI reporting, the corresponding Downlink Control Information (DCI) for Uplink (UL) grants (in DCI format 0, DCI format 4 or any future DCI format introduced in LTE-A for UL grants, for example) may transmit in an invalid subframe. This can occur, for example, for Common Reference Signal (CRS) based reporting, if the subframe is an MBSFN subframe where CRS is not present in the data region. This can also occur, for example, for reports based on Channel State Reference Information Signal (CSI-RS), if the subframe does not contain CSI-RS. In some configurations, however, it should be noted that subframes not containing CSI-RS can also be defined as valid. Additionally or alternatively, interference can be measured in the reference subframe, while the channel can be measured in a more recent CSI-RS subframe. In some configurations, interference and channel can be measured in different subframes. It should be noted that a CSI-RS may include a subset of information used for feedback. For example, a CRS may include information for determining both channel feedback and interference feedback. In one configuration a CSI-RS may include information for determining only interference feedback or channel feedback.
[0045] Alternatively, for aperiodic CQI reporting, corresponding DCI for US grants (e.g. DCI format 0, or any new DCI format introduced in LTE-A for UL grants) may transmit in a subframe that is not suitable for a CQI reference. This can occur, for example, if cross-subframe scheduling is used (where a Physical Downlink Control Channel (PDCCH) scheduling a Physical Uplink Shared Channel (PUSCH) is sent in a subframe with a different timing ratio than from version 8, for example). It should be noted that a subframe other than a PDCCH subframe may be more suitable for a CQI reference.
[0046] The same approaches discussed above may be applicable to periodic reporting. For example, for channel state information reference signal (CSI-RS) based reporting, similar reference subframes can be defined. The systems and methods described herein may be described in terms of aperiodic reporting. However, the same or a similar design may apply to the periodic report. A specific example is provided as follows.
[0047] In a half duplex relay, where a Relay Node (RN) cannot transmit and receive simultaneously, RN must configure MBSFN subframes when receiving the downlink feedback access channel from a donor eNB. In other words, a downlink feedback access channel subframe on the RN must be an MBSFN subframe. In these MBSFN subframes, RN can transmit control on the first one or two control symbols (for UEs directly connected to RN or “access link” UEs, for example), switch from transmit to receive, receive access channel information from Downlink (DL) feedback (control and data) from the donor eNB and switch back from receive to transmit.
[0048] UL programming can be performed in the control region of these MBSFN subframes. If the same aperiodic CQI version 8 reference subframe is defined, aperiodic CQI cannot be reported for DCI sent in those MBSFN subframes. For Time Division Duplexing (TDD), these MBSFN subframes can be intensively used for UL scheduling to maintain the same Hybrid Automatic Repeated Request (H-ARQ) Version 8 timing relationship for the access link UEs. This can be a potentially severe limitation on the ability to have the aperiodic CQI report.
[0049] Various configurations are now described with reference to the figures, where similar numerical references may indicate elements of similar functionality. Systems and methods are generally described and illustrated in the figures here and can be arranged and designed in a wide variety of different configurations. Accordingly, the following more detailed description of various configurations as depicted in the figures should not limit the scope, as claimed, but is merely representative of the systems and methods.
[0050] Figure 1 is a block diagram illustrating a configuration of a wireless communication device 102 (eg UE) where the systems and methods of determining a subframe of reference can be implemented. Wireless communication device 102 can communicate with a base station 122 (e.g. eNB). For example, wireless communication device 102 and base station 122 can communicate with each other by transmitting and/or receiving electromagnetic signals.
[0051] Wireless communication device 102 may include a feedback reporting module 104, encoder/decoder A 108, modem A 110, transceiver A 112 and/or one or more antennas 114a-n. Transceiver A 112 may receive one or more signals (e.g., a signal 116) and/or may transmit one or more signals (e.g., a report 118) using the one or more antennas 114 an. For example, transceiver A 112 can receive, amplify and downconvert a signal 116 from base station 122, which can supply a modem A 110. Transceiver A 112 can also obtain a modulated signal provided by modem A 110. Transceiver A 112 can upconvert, amplify and transmit the modulated signal using the one or more antennas 114a-n.
[0052] Modem A 110 can modulate and/or demodulate signals. For example, modem A 110 may demodulate a signal provided by transceiver A 112 and provide the demodulating signal to encoder/decoder A 108. Modem A 110 may also modulate an encoded signal provided by encoder/decoder A 108, which 100 may supply to transceiver A 112 as a modulated signal.
[0053] Encoder/decoder A 108 can encode and/or decode signals. For example, encoder/decoder A 108 can decode a demodulated signal provided by modem A 110, which 110 can provide to feedback reporting module 104. Encoder/decoder A 108 can also encode a signal provided by feedback reporting module. 104, which 108 can supply to modem A 110.
[0054] Feedback reporting module 104 may generate feedback (e.g. CQI, PMI, RI and/or ACK/NACK) based on signal 116 received from base station 122. For example feedback reporting module 104 can measure one or more channel characteristics (e.g., signal-to-noise ratio (SNR), interference, phase shift, timing, frequency shift, direction, bit error rate, etc.) and generate feedback that is sent as a report 118 to base station 122. In some configurations, report 118 may contain CQI, PMI, RI, ACK/NACK and/or channel state information (CSI) etc.
[0055] Feedback reporting module 104 may include a reference subframe determination module 106. Reference subframe determination module 106 may determine a reference subframe which is used to generate feedback (e.g. CQI, PMI, RI, etc.). For example, a feedback report 118 may be generated by wireless communication device 102 that refers to a particular subframe. In other words, the feedback reporting module 104 can determine the feedback based on a reference subframe which can be determined based on a reporting subframe. This feedback can be used to improve communications (eg, reliability, signal strength, etc.) between wireless communication device 102 and base station 122. Feedback (eg, CQI, PMI, RI) can also be used. be sent to base station 122 in subframes. For example, feedback may be sent to base station 122 in a subframe described as a "report" subframe.
[0056] For example, communication between wireless communication device 102 and base station 122 can be structured according to radio frames and subframes. Each radio frame can include a number of subframes. Each subframe can be defined according to time (eg time length and/or start/end times). Depending on the configuration, various types of subframes can be used, such as uplink subframes, downlink subframes, and special subframes, for example.
[0057] In some configurations, the reference subframe determination module 106 may determine a reference subframe based on a threshold and one or more constraint criteria. For example, the reference subframe determining module 106 may determine a reference subframe based on a threshold and one or more limiting criteria such as reporting subframe (number), one or more thresholds, trigger type (e.g. , periodic or aperiodic), “validity” of a subframe, type of subframe (e.g. type “U” or type “N”, uplink subframe, downlink subframe, DCI subframe, etc.) if a subframe can be used for interference measurement and/or channel measurement, and/or reference signal type (eg, common reference signal (CRS) or channel state information reference signal (CSI-RS)). Additionally or alternatively, the reference subframe determining module 106 may determine or select one of a plurality of ways for determining a reference subframe. In some cases, a mode may be selected based on a signal 116 (e.g., instruction, command, etc.) from base station 122. Examples of some possible configurations regarding the determination of one or more reference subframes according to the systems and methods described here are provided in more detail below.
[0058] Base station 122 may include an operations module 130, encoder/decoder B 128, modem B 126, transceiver B 124 and/or one or more antennas 120a-n. Transceiver B 124 may receive one or more signals (e.g., a report 118) and/or may transmit one or more signals (e.g., a signal 116) using the one or more antennas 120a-n. For example, transceiver B 124 may receive, amplify, and downconvert a signal (e.g., report 118) from wireless communication device 102, which may provide to modem B 126. Transceiver B 124 may also obtain a modulated signal provided by modem B 126. Transceiver B 124 may upconvert, amplify, and transmit the modulated signal using one or more antennas 120a-n.
[0059] Modem B 126 can modulate and/or demodulate signals. For example, modem B 126 may demodulate a signal provided by transceiver B 124 and provide the demodulated signal to encoder/decoder B 128. Modem B 126 may also modulate an encoded signal provided by encoder/decoder B 128, which 126 may supply to transceiver B 125 as a modulated signal.
[0060] Encoder/decoder B 128 can encode and/or decode the signals. For example, encoder/decoder B 128 may decode a demodulated signal provided by modem B 126, which 126 may provide to operations module 130. Encoder/decoder B 128 may also encode a signal provided by operations module 130, which 128 may provide for modem B 126.
[0061] Operations module 130 may perform one or more functions to allow communications between base station 122 and wireless communication device 102. For example, operations module 130 may generate programming messages, reference signals (e.g. example, CRS, CSI-RS) for generating feedback, a mode selection indicator, etc. One or more of these pieces of information may be transmitted to wireless communication device 102. For example, signal 116 may include a reference signal (e.g. CRS, CSI-RS) that wireless communication device 102 may use to generate a feedback report 118. Additionally or alternatively, signal 116 may include a mode selection indicator, which wireless communication device 102 may use to select a mode of determination of a subframe of reference.
[0062] It should be noted that one or more of the elements illustrated as included within the wireless communication device 102 and/or base station 122 may be implemented in hardware, software, or a combination of both. For example, the reference subframe determination module 106a may be implemented in hardware, software, or a combination of both.
[0063] Figure 2 is a diagram illustrating a series of subframes. As described above, a base station 122 (e.g. eNB) and a wireless communication device 102 (e.g. UE) can send data or information in subframes to each other. Each of these subframes may be designated by a subframe number 238. One or more of these subframes may include information or data. It should be noted that a base station 122 may serve multiple wireless communication devices 102. In that case, information in some subframes may correspond to a wireless communication device 102 while information in other subframes may correspond to another wireless communication device. wireless communication. Additionally or alternatively, subframes can be of one or more types (eg uplink, downlink, special, etc.).
[0064] Some subframes may contain control information, such as a downlink control information (DCI) subframe. Some subframes may contain one or more reference signals, such as the common reference signal (CRS) or channel state information reference signal (CSI-RS).
[0065] A wireless communication device 102 can determine a reporting subframe n 236. For example, a wireless communication device 102 can be configured to regularly send feedback reports in a designated subframe (according to the periodic feedback, for example) or can be configured to send feedback reports when requested by base station 122 (according to aperiodic triggering, for example). A reporting subframe 236n may be the subframe where a feedback report 118 is sent to base station 122 from wireless communication device 102. A reporting subframe number 236 may be denoted n.
[0066] Wireless communication device 102 may also determine a reference resource subframe n-reference 234 (which may be referred to as "reference subframe" here). Wireless communication device 102 may base a feedback report on a reference subframe 234. For example, wireless communication device 102 may use data or information contained in reference subframe 234 to generate a CQI, PMI and/or or RI. A reference resource subframe number can be described as the n-nreference reference subframe (eg n-nCQI-ref). In other words, the reference resource subframe number n-reference may be based on and/or described in terms of the reporting subframe number. nreference 232 (e.g. nCQI-ref) may be the difference in subframe number 238 between reporting subframe n 236 and resource subframe n-reference nreference 234.
[0067] It should be noted that subframe number 238 may be cyclic or based on a modular function in some configurations. For example, each radio frame may include subframes with subframe numbers 0-9. That way, if nreference is greater than n, subframe of reference 234 can correspond to a subframe in a previous radio frame. For example, if n is subframe 2 and nreference is equal to 4, then subframe 234 may be subframe 8 in a previous radio frame.
[0068] In some configurations, multiple values of nreference 232 may be used, which may specify the same or different subframes of reference 234. For example, a first and a second nreference 232 may be used (e.g. nreference and nreference2, such as nCQI_ref_intf and nCQI_ref_channel, respectively) to specify the same or different reference subframes 234. The same or different reference subframes can be used to create different types of measurements and/or to generate different types of feedback. For example, n-nCQI_ref_intf can specify a first reference subframe used to measure interference (and generate feedback based on the interference measurement, for example), while n-nCQI_ref_channel can specify a second reference subframe (which can be equal to or different from the first reference subframe) used to measure a channel (and generate feedback based on the channel measurement, for example).
[0069] Fig. 3 is a flowchart illustrating a configuration of a method 300 for determining a subframe of reference in a wireless communication device 102. The wireless communication device 102 may determine 302 a subframe of reporting n. For example, wireless communication device 102 may be configured to send a feedback report 118 within a designated reporting subframe n based on periodic feedback or aperiodic triggering (e.g., when requested by a base station 1220.
[0070] Wireless communication device 102 may determine 304 an n-reference subframe if possible. More specifically, wireless communication device 102 may determine 304 the reference subframe based on a threshold (e.g., 4, k, L) and one or more limiting criteria (in addition to reporting subframe number n, for example), if possible. For example, the threshold can limit the range of possible values for nreference. In one configuration, for example, if the threshold equals 4, then nreference > 4. The limiting criteria may be one or more additional conditions that can be used by the wireless communication device 102 to determine 304 the subframe of reference. For example, the throttling criteria may comprise one or more additional thresholds (e.g., a maximum value, minimum value, or both), whether a subframe is "valid", whether a subframe is a downlink control information (DCI) subframe ), whether periodic feedback or aperiodic triggering (feedback) is used, reference signal type (e.g. CRS or CSI-RS), subframe type, whether wireless communication device 102 is operating on a heterogeneous network ( e.g. HET-NET), if a subframe is assigned to wireless communication device 102, if a subframe falls into a measurement and mode space. In some cases, a reference subframe may not be determined if a subframe is not available that satisfies the threshold and one or more limiting criteria. It should be noted that a number of subframes can correspond to an amount of time (eg delay). Examples of the limit and one or more limiting criteria are described below with reference to figures 4 through 12.
[0071] Wireless communication device 102 may generate 306 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. For example, wireless communication device 102 may generate one or more of CQI, PMI, and/or RI based on subframe reference measurements (e.g., from a common reference signal (CRS) or a channel state information reference (CSI-RS)). In some cases, a subframe of reference may not be able to be determined. For example, the threshold and one or more threshold criteria may not be satisfied by any available subframe. In such a case, a report 118 may not be generated.
[0072] Wireless communication device 102 may send 308 report 118 during report subframe if reference subframe is determined. For example, wireless communication device 102 may send a CQI, PMI and/or RI feedback report 118 to base station 122 during the reporting subframe. However, if a reference subframe is not determined, wireless communication device 102 may not send report 118.
[0073] Figure 4 is a flowchart illustrating an example of a method 400 for determining a reference subframe. For example, Figure 4 may illustrate a specific mode or example of the method 300 illustrated in Figure 3. More specifically, Figure 4 illustrates an example of a method for CQI/PMI/RI reporting based on Common Reference Signal (CRS). ). A wireless communication device 102 may determine 402 a reporting subframe n. In other words, the wireless communication device 102 may determine a subframe in which to send a feedback report (e.g., CQI/PMI/RI) 118 as described above. This can be done using aperiodic triggering, for example. In aperiodic triggering, wireless communication device 102 may receive some timing designation (from a base station 122, where a bit is a timing designation, for example) to determine whether a report 118 is triggered or not.
[0074] Wireless communication device 102 may determine 404 a reference subframe if possible. The subframe of reference to report in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref for aperiodic triggering, where nCQI_ref is a smallest value greater than or equal to 4 so that it corresponds to a valid downlink subframe. More generally, wireless communication device 102 may determine 404 a reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be 4 and nreference (for example, nCQI_ref) is a smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe. In this example, the limiting criteria comprise aperiodic triggering. This can be a similar design to the one used for aperiodic CQI. This can also use the same timing reference for Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD).
[0075] Wireless communication device 102 may generate 406 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example. Wireless communication device 102 may send 408 report 118 during the reporting subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example.
[0076] Figure 5 is a flowchart illustrating another example of a method 500 for determining a reference subframe. For example, Figure 5 may illustrate a specific mode or example of the method 300 illustrated in Figure 3. A wireless communication device 102 may determine 502 a reporting subframe n. This can be done on the basis of periodic feedback or aperiodic triggering (feedback) as described above, for example.
[0077] Wireless communication device 102 may determine 504 a reference subframe if possible. The subframe of reference to report in subframe n may be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref, where nCQI_ref is such that the subframe of reference (including a reference resource) is the first subframe of valid downlink on or before the corresponding CQI request in a DCI subframe. More generally, wireless communication device 102 may determine 504 a reference subframe based on a threshold (e.g., an L value) and at least one threshold criterion if possible. In this example, the threshold can be L and nreference (eg nCQI_ref) is a smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe. In this example, the limiting criteria comprise limiting L to a difference in subframe number between the reporting subframe n and a downlink control information (DCI) subframe.
[0078] This may have potentially different reference timing for FDD and TDD. For FDD, the reference subframe can be the first 4 valid downlink milliseconds (ms) or earlier. The timing between DCI and PUSCH is typically 4 ms. For TDD, the reference subframe can be the first valid downlink X ms or before (where X ms corresponds to the threshold L, for example). The timing between DCI and PUSCH can be X > 4 ms, for example.
[0079] Wireless communication device 102 may generate 506 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example. Wireless communication device 102 may send 508 the report 118 during the reporting subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example.
[0080] It should be noted that the examples illustrated in Figure 4 and Figure 5 may both have the following disadvantages. Upon detection of an aperiodic CQI-triggered DCI, wireless communication device 102 may need to measure a subframe before the DCI subframe. However, wireless communication device 102 may be in Reception Discontinuous (DRX) in the subframes before the DCI subframe. Additionally, wireless communication device 102 may need to store many DL subframes for an aperiodic CQI report. An additional optional limiting criterion that can be applied to the examples illustrated in Figure 4 and Figure 5 is to place an additional upper limit on nreference (eg nCQI_ref). For example, 4 < nreference < Y OR L < nreference < nreference < Y, where Y is the upper bound.
[0081] Figure 6 is a flowchart illustrating another example of a method 600 for determining a reference subframe. For example, Figure 6 may illustrate a specific mode or example of the method 300 illustrated in Figure 3. A wireless communication device 102 may determine 602 a reporting subframe n. This can be done on the basis of periodic feedback or aperiodic triggering (feedback) as described above, for example.
[0082] Wireless communication device 102 may determine 604 a reference subframe if possible. The subframe of reference for reporting in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref, where nCQI_ref is the smallest value greater than or equal to 4 that corresponds to a valid downlink subframe and is such that the reference subframe (eg, reference resource) is the first valid downlink subframe on or after the corresponding CQI request in a DCI format. In other words, the reference subframe can be at least 4 ms earlier (than a reporting subframe, for example) and can be in or after a DCI subframe. This may imply that if the CDI subframe is MBSFN and if the timing between CDI and PUSCH is 4 ms (as in FDD cases and some TDD cases, for example), then aperiodic CQI reporting should not be triggered (or if triggered, then there may not be any significant aperiodic CQI reporting). Otherwise (if the timing is > 4 ms, as in some TDD cases, for example), aperiodic CQI can be triggered if there is at least one valid downlink reference subframe between the DCI subframe and the n-4 subframe.
[0083] More generally, the wireless communication device 102 may determine 604 a reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be 4 and nreference (for example, nCQI_ref) is the smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe that is in or after a DCI subframe. In this example, the limiting criteria comprise placing an additional upper bound L on the nreference, where L is a difference in the number of subframes between the reporting subframe n and a downlink control information (DCI) subframe. For example, 4 < nreference — L.
[0084] Wireless communication device 102 may generate 606 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example. Wireless communication device 102 may send 608 report 118 during the reporting subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example.
[0085] Figure 7 is a flowchart illustrating another example of a method 700 for determining a reference subframe. For example, Figure 7 may illustrate a specific mode or example of the method 300 illustrated in Figure 3. A wireless communication device 102 may determine 702 a reporting subframe n. This can be done on the basis of periodic feedback or aperiodic triggering (feedback) as described above, for example.
[0086] Wireless communication device 102 may determine 704 a reference subframe if possible. The subframe of reference for the report in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref, where nCQI_ref is such that the subframe of reference is (e.g. reference feature is on) the downlink subframe in the corresponding CQI request in a DCI subframe if the subframe is a valid downlink subframe or if nCQI_ref is such that n-nCQI_ref matches a predetermined (e.g. fixed) subframe number (e.g. 0, 5, etc.).
[0087] More generally, wireless communication device 102 may determine 704 a reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be 4 and nreference (e.g. nCQI_ref) is the smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe and the throttling criteria comprise limiting nreference to a value such that n- nreference matches a downlink control information subframe number or matches a predetermined subframe number.
[0088] Wireless communication device 102 may generate 706 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. This can be done as described with respect to Figure 3 above, for example, Wireless communication device 102 can send 708 report 118 during report subframe if reference subframe is determined. This can be done as described with respect to figure 3 above, for example.
[0089] Figure 8 is a flowchart illustrating another example of a method 800 for determining a reference subframe. For example, Figure 8 may illustrate a specific mode or example of method 300 illustrated in Figure 3. This example may be considered an extension of the example illustrated in Figure 6. A wireless communication device 102 may determine 802 a reporting subframe n . This can be done on the basis of periodic feedback or aperiodic triggering (feedback) as described above, for example.
[0090] Wireless communication device 102 may determine 804 a reference subframe if possible. The subframe of reference for reporting in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref, where nCQI_ref is the smallest value greater than or equal to k (where 2 < k < 4, for example) that corresponds to a valid downlink subframe and is such that the reference subframe is (e.g. the reference resource is in) the first valid downlink subframe on or after a corresponding CQI request in a DCI subframe. For example, this allows for relaxed timing between the reference subframe and CQI reporting. Instead of a minimum of 4 ms, for example, a smaller value can be used.
[0091] More generally, the wireless communication device 102 can determine 804 a reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be k and nreference (for example, nCQI_ref) is a smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe that is in or after a DCI subframe. In this example, the limiting criteria comprise placing an additional upper bound L on nreference, where L is a difference in the number of subframes between the reporting subframe n and a downlink control information (DCI) subframe. For example, k < nreference < L.
[0092] Wireless communication device 102 may generate 806 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example. Wireless communication device 102 may send 808 report 118 during the reporting subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example.
[0093] The examples illustrated in figures 4 to 8 can be summarized as illustrated in Table (1).


[0094] Figure 9 is a flowchart illustrating another example of a method 900 for determining a reference subframe. For example, Figure 9 may illustrate a specific mode or example of the method 300 illustrated in Figure 3. In that example, a single reference subframe may be used for both channel and interference determination. A wireless communication device 102 may determine 902 a reporting subframe n. This can be done on the basis of periodic feedback or aperiodic triggering (feedback) as described above, for example.
[0095] Wireless communication device 102 may determine 904 a reference subframe if possible. The subframe of reference for reporting in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref, where nCQI_ref is the smallest value greater than or equal to k that corresponds to a valid downlink subframe that includes a channel state information reference signal (CSI-RS). For example, a downlink subframe can be considered valid if it includes a CSI-RS.
[0096] In one example, both channel (for PMI feedback, for example) and interference (for CQI feedback, for example) can be measured via a channel state information reference signal (CSI-RS). A reference subframe can be a more recent subframe including a CSI-RS. The reference subframe can be defined as valid if it is a downlink subframe, and is not in a measurement space and contains a CSI-RS.
[0097] More generally, wireless communication device 102 may determine 904 a reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be k and nreference (for example, nCQI_ref) is the smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe. In this example, the throttling criteria comprises a downlink subframe that includes a CSI-RS.
[0098] Wireless communication device 102 may generate 906 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example. Wireless communication device 102 may send 908 the report 118 during the reporting subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example.
[0099] Figure 10 is a flowchart illustrating another example of a method 1000 for determining a reference subframe. For example, Figure 10 may illustrate a specific mode or example of method 300 illustrated in Figure 3. In that example, the same or different reference subframes may be used for channel and interference determination. A wireless communication device 102 may determine 1002 a reporting subframe n. This can be done on the basis of periodic feedback or aperiodic triggering (feedback) as described above, for example.
[00100] Wireless communication device 102 may determine 1004 a first subframe of n-reference (e.g. n-nCQI_ref_intf) if possible. The first subframe of reference for reporting in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref_intf, where nCQI_ref_intf is a value greater than or equal to ki (e.g. ki < 4), so that it matches a valid downlink first subframe.
[00101] More generally, wireless communication device i02 can determine i004 a first reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be ki and nreference (eg nCQI_ref_intf) is a value greater than or equal to the threshold that corresponds to a valid downlink first subframe. Additionally, the limiting criteria comprise the use of the subframe for interference measurement. For example, n-nreference can specify a downlink subframe that can be used to measure interference (for CQI feedback, for example).
[00102] Wireless communication device i02 can assign i006 a second subframe of reference n-n-ref2 (eg n-nCQI_ref_channel ) if possible. The second subframe of reference to report in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref_channel, where nCQI_ref_channel is a value greater than or equal to k2 (e.g. k2 < 4), from so that it matches a second valid downlink subframe.
[00103] More generally, wireless communication device 102 may determine 1006 a second reference subframe based on a threshold (and optionally based on at least one threshold criterion, for example) if possible. In this example, a second threshold can be k2 and nref2 (e.g. nCQI_ref_channel) if a value greater than or equal to the second threshold that corresponds to a second valid downlink subframe (which can be equal to or different from the first valid downlink subframe). In some configurations, the throttling criteria may additionally comprise using the second valid downlink subframe for channel metering. For example, n-nreference2 (eg n-nCQI_ref_channel) can specify a downlink subframe that can be used to measure a channel (for PMI feedback, for example).
[00104] Wireless communication device 102 can measure 1008 interference in the first subframe of reference if the first subframe of reference is determined (for example, if a subframe is available and satisfies the conditions described above). For example, wireless communication device 102 may measure 1008 interference using a signal (e.g., received and/or unreceived data or information) in the first reference subframe. Wireless communication device 102 may measure 1010 a channel in the second reference subframe if the second reference subframe is determined (e.g., if a subframe is available and satisfies the conditions described above). For example, wireless communication device 102 may measure 1010 a channel using a signal (e.g., received and/or not received data or information) in the second reference subframe.
[00105] In one example, a channel can be measured through CSI-RS and interference can be measured through CRS. For example, a first subframe of reference can be defined based on CRS. More specifically, one of the previously described nreference values (with respect to figure 4, figure 5, figure 6, figure 7, figure 8 or that has been described with respect to version 8 options above, for example) can be applied. A reference subframe can be valid if it is a downlink subframe, not in a measurement space, possibly not DwPTS and/or not MBSFN. A second reference subframe may be based on CSI-RS, where it corresponds to a more recent CSI-RS subframe and is not in a measurement space.
[00106] In another example, a channel can be measured through CSI-RS, while interference can be measured through CRS. In another example, both channel and interference can be measured using CRS. In another example, both channel and interference can be measured via CSI-RS.
[00107] Wireless communication device 102 may generate 1012 a report (feedback) 118 based on the first reference subframe if the first reference subframe is determined and/or based on the second reference subframe if the second reference subframe is determined. For example, wireless communication device 102 may generate one or more of a CQI, a PMI and/or an RI based on information received (or not received) in the reference subframes. Wireless communication device 102 may then send 1014 the report during the reporting subframe if the first reference subframe is determined and/or if the second reference subframe is determined. More specifically, wireless communication device 102 may send a CQI, PMI and/or RI feedback report to base station 122 during the reporting subframe if possible.
[00108] Fig. 11 is a flowchart illustrating another example of a method 1100 for determining a reference subframe. For example, Figure 10 may illustrate a specific mode or example of the method 300 illustrated in Figure 3. The method illustrated in Figure 11 may use the same or different types of subframes. For example, a reference subframe can be determined based on the subframe type. For example, in Heterogeneous Networks (HetNets), there can be different types of subframes. Each type can represent a certain amount of intercellular interference on average from the perspective of the wireless communication device 102. For example, a subframe of type N can be a subframe that has a high amount of interference for a wireless communication device. in particular 102. For example, an N-type subframe may include interference greater than the average for a subframe. In some cases, an N-type subframe may generally be considered useless (although it can still be used in some cases). A U-type subframe can be a subframe that has less interference. For example, a U-type subframe may include less than average interference for a subframe. In some cases, a U-type subframe may be considered usable. A PDCCH can be transmitted selectively in certain subframes (and/or subframe types). Cross subframe programming can also be used. For example, the timing between a PDCCH and PUSCH may no longer be based on version 8, but may be different (e.g. greater than) version 8.
[00109] In an example illustrated in Figure 11, the same reference subframe can be used for both channel and interference determinations. Additionally, this method may be applicable to both CRS and CSI-RS configurations. A wireless communication device 102 may determine 1102 a reporting subframe n. In other words, wireless communication device 102 may determine 1102 a subframe in which to send a feedback report (e.g., CQI/PMI/RI) 118 based on periodic feedback or aperiodic triggering (feedback) as described above.
[00110] Wireless communication device 102 may determine 1104 an n-n-reference subframe (eg n-nCQI_ref) if possible. The subframe of reference for reporting in subframe n can be determined as (e.g. defined by) a single downlink subframe n- nCQI_ref, where nCQI_ref is a value greater than or equal to k (e.g. k < 4), so that corresponds to a valid downlink subframe of a given subframe type.
[00111] For example, one of the examples (eg n-reference values) described above with respect to figure 4, figure 5, figure 6, figure 7, figure 8, figure 9, figure 10 or version 8 can be applied subject to a certain type of subframe. It should also be noted that the subframe type of the reference subframe and the reporting subframe can be the same or different, which can be controlled by a base station 122 (e.g. eNB). In other words, the subframe type for a referenced subframe can be implicitly or explicitly defined.
[00112] More generally, wireless communication device 102 may determine 1104 a reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be e nreference (for example, nCQI_ref) is the smallest value greater than or equal to the threshold that corresponds to a valid downlink subframe. In this example, the throttling criteria comprise a downlink subframe that is a certain type of subframe (eg, “N” or “U”).
[00113] Wireless communication device 102 may generate 1106 a report (feedback) 118 based on the reference subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example. Wireless communication device 102 may send 1108 the report 118 during the reporting subframe if the reference subframe is determined. This can be done as described with respect to figure 3 above, for example.
[00114] Fig. 12 is a flowchart illustrating another example of a method 1200 for determining a reference subframe. For example, Fig. 12 may illustrate a specific mode or example of method 300 shown in Fig. 3. The example shown in Fig. 12 may use the same type of subframe or a different type of subframe. For example, a reference subframe can be determined based on the type of subframe (eg, "U" or "N" as described above). Each type can represent a certain amount of intercellular interference on average from the perspective of wireless communication device 102. A PDCCH can be selectively transmitted in certain subframes (and/or subframe types). Cross-subframe programming can also be used. For example, the timing between PDCCH and PUSCH may no longer be based on version 8, but may be different (e.g. greater than) version 8.
[00115] In the example illustrated in Figure 12, different reference subframes can be used for channel and interference determinations in some cases. Additionally, this example may be applicable to both CRS and CSI-RS configurations. A wireless communication device 102 may determine 1202 a reporting subframe n. In other words, wireless communication device 102 may determine 1202 a subframe in which to send a feedback report (e.g., CQI/PMI/RI) 118 as described above.
[00116] Wireless communication device 102 may determine 1204 a first subframe of n-reference (e.g. n-nCQI_ref_intf) if possible. The first subframe of reference to report in subframe n can be determined as (e.g. defined by) a single downlink subframe, n-nCQI_ref_intf, where , n-nCQI_ref_intf is a value greater than or equal to ki (e.g. ki < 4 ) to match a valid first downlink subframe of a given subframe type.
[00117] More generally, wireless communication device i02 can determine i204 a first reference subframe based on a threshold and at least one threshold criterion if possible. In this example, the threshold can be ki and nreference (for example, n-nCQI_ref_intf) is a value greater than or equal to the threshold that corresponds to a valid first downlink subframe. Additionally, the limiting criteria comprise the use of a subframe of a certain type of subframe (eg, "U" or "N"). For example, n-nreference can specify a downlink subframe of a certain type that can be used to measure interference (for CQI feedback, for example).
[00118] Wireless communication device i02 can assign i206 a second subframe of reference n-n-ref2 (eg n-nCQI_ref_channel ) if possible. The second subframe of reference to report in subframe n can be determined as (e.g. defined by) a single downlink subframe n-nCQI_ref_channel, where nCQI_ref_channel is a value greater than or equal to k2 (e.g. k2 < 4), so so that it corresponds to a second valid downlink subframe (of a given subframe type, for example).
[00119] More generally, wireless communication device 102 may determine 1206 a second reference subframe based on a threshold (and optionally based on at least one threshold criterion, for example), if possible. In this example, a second threshold can be k2 and nreference2 (e.g. nCQI_ref_channel) is a value greater than or equal to the second threshold that corresponds to a valid second downlink subframe (which can be a subframe equal to or different from the first downlink subframe valid). In some configurations, the throttling criteria may additionally comprise using the second valid downlink subframe of a given subframe type. For example, n-nreference2 (eg n-nCQI_ref) can specify a downlink subframe of a certain type of subframe that can be used to measure a channel (for PMI feedback, for example).
[00120] Wireless communication device 102 can measure 1208 interference in the first reference subframe if the first reference subframe is determined (for example, if a subframe is available and satisfies the conditions described above). For example, wireless communication device 102 may measure 1208 interference using a signal (e.g., received and/or unreceived data or information) in the first reference subframe. Wireless communication device 102 may measure 1210 a channel in the second reference subframe if the second reference subframe is determined (e.g., if a subframe is available and satisfies the conditions described above). For example, wireless communication device 102 may measure 1210 a channel using a signal (e.g., received and/or not received data or information) in the second reference subframe.
[00121] Wireless communication device 102 may generate 1212 a report (feedback) 118 based on the first reference subframe if the first reference subframe is determined and/or based on the second reference subframe if the second reference subframe is determined. For example, wireless communication device 102 may generate one or more CQI, PMI and/or RI based on information received (or not received) in the reference subframes. Wireless communication device 102 may then send 1214 the report during the reporting subframe if the first reference subframe is determined and/or if the second reference subframe is determined. More specifically, wireless communication device 102 may send a CQI, PMI and/or RI feedback report to base station 122 during the reporting subframe if possible.
[00122] In this way, several alternative reference subframes for CQI/CSI reporting in subframe n can be used. In one example, the reference subframe can (always) be based on the DCI subframe, if the subframe is valid. The measurement delay may be longer than 4 ms, although this may not be desirable. In another example, the reference subframe may be based on a valid subframe (eg n-k, where k > 2, k > 4, etc.) or earlier but not earlier than the DCI subframe. The measurement delay can be well controlled. In another example, the reference subframe may be based on a valid subframe (e.g. nk, where k > 2, k > 4, etc.) or earlier of the same subframe type as the DCI subframe, m,but not before the DCI subframe. In this example, the measurement delay can be well controlled. A wireless communication device 102 can be semi-statically configured for either option. Other variations discussed above may apply as well.
[00123] Several points should be noted. Interference can always be measured in the defined reference subframe. In one example, a reference subframe type (eg U type/N type) can be controlled with DCI timing. In another example, the reference subframe type can be controlled with a Layer 3 (L3) CSI configuration. In another example, the reference subframe type can be controlled with DCI code points. A valid subframe for interference may be the most recent subframe of the requested type that satisfies one of the alternative conditions described above. The channel can be measured in the most recent suitable subframe. A suitable subframe may be a U subframe (for the serving cell, for example). Under light interference conditions, any subframe may be suitable for channel measurement. For example, strict definition of subframes may not be necessary unless CRS or CSI-RS power variations are allowed.
[00124] It should also be noted that a wireless communication device 102 may be configured to use one or more of the examples described above. For example, a wireless communication device 102 can be configured so that it can determine the subframe of reference using one or more of the examples (e.g., "modes") illustrated in Figures 4 to 12. For example, a wireless communication device wireless communication 102 can determine which one of the methods would be most beneficial (eg, depending on channel conditions) and can therefore select and use that method. Additionally or alternatively, a base station 122 may designate a wireless communication device 102 to select one of several available modes for determining a subframe of reference.
[00125] Additionally, for a wireless communication device 102, different design options can be applied to different types of channel feedback. For example, for an R1 (which is typically sent less frequently), a wireless communication device 102 may not follow the same specific subframe type (eg, “U” or “N” type subframes) as for CQI and/or PML. RI may be reported by always referring to U subframes in some configurations. In that case, PMI and CQI for N subframes can be unified and independent of the RI reported for U subframes. In other words, base station 122 (e.g. eNB) can interpret the classification in N subframes differently from U subframes. Alternatively, RI may be reported individually for two or more subframe types (e.g. one for U subframes and one for “N” subframes).
[00126] Fig. 13 is a flowchart illustrating a configuration of a method 1300 for determining a mode at a base station 122. More specifically, Fig. 13 illustrates a method 1300 for optionally determining a subframe determination mode. A base station 122 may optionally determine 1302 a reference subframe determination mode. For example, base station 122 may determine a mode that a wireless communication device 102 may use to determine a reference subframe. For example, base station 122 may select one of the modes (e.g. examples) described above. Base station 122 may then optionally send 1304 a feedback mode indicator. For example, base station 122 may send an indicator to wireless communication device 102 that specifies a particular reference subframe determination mode for use.
[00127] Base station 122 may send 1306 a reference signal. For example, base station 122 may send one or more reference signals such as a common reference signal (CRS) and/or a channel status information reference signal (CSI-RS). Base station 122 may receive feedback 1308 (e.g., a feedback report 118). For example, base station 122 may receive CQI, PMI and/or RI from wireless communication device 102.
[00128] Fig. 14 is a block diagram illustrating a configuration of a wireless communication device 1402 where the systems and methods of determining a subframe of reference can be implemented. Wireless communication device 1402 may be an example of wireless communication device 102 described above. Wireless communication device 1402 may include an application processor 1450. Application processor 1450 generally processes instructions (e.g., runs programs) to perform functions on wireless communication device 1402. Application processor 1450 may be coupled to a Audio encoder/decoder (codec) 1448.
[00129] Audio codec 1448 may be an electronic device (eg, integrated circuit) used to encode and/or decode audio signals. Audio codec 1448 may be coupled to one or more speakers 1440, a headset 1442, an output jack 1444, and/or one or more microphones 1446. Speakers 1440 may include one or more electro-acoustic transducers that convert signals electrical or electronic signals into acoustic signals. For example, 1440 speakers can be used to play music or send a loudspeaker conversation, etc. The 1442 headset can be another loudspeaker or electro-acoustic transducer that can be used to send acoustic signals (eg, speech signals) to a user. For example, the 1442 headset can be used so that only one user can reliably hear the acoustic signal. Output jack 1444 can be used to couple other devices to wireless communication device 1042 to send audio, such as headphones. Speakers 1440, headphone 1442, and/or output jack 1444 may generally be used to output an audio signal from audio codec 1448. The one or more microphones 1446 may be one or more acoustic-electrical transducers that convert an acoustic signal (such as a user's voice) into electrical or electronic signals that are supplied to the 1448 audio codec.
[00130] The 1450 application processor can also be coupled to a 1456 power management circuit. An example of a 1456 power management circuit is a power management integrated circuit (PMIC), which can be used to manage consumption of electrical power from the wireless communication device 1402. The power management circuit 1456 may be coupled to a battery 1458. The battery 1458 may generally supply electrical power to the wireless communication device 1402.
[00131] Application processor 1450 may be coupled to one or more input devices 1460 to receive the record. Examples of 1460 input devices include infrared sensors, image sensors, accelerometers, touch sensors, keyboards, etc. Input devices 1460 may allow user interaction with wireless communication device 1402. Application processor 1450 may also be coupled to one or more output devices 1462. Examples of output devices 1462 include printers, projectors, displays , haptic devices, etc. Output devices 1462 may allow wireless communication device 1402 to produce output that can be experienced by a user.
[00132] Application processor 1450 may be coupled to application memory 1464. Application memory 1464 may be any electronic device that can store electronic information. Examples of 1464 application memory include dual data rate synchronized dynamic random access memory (DDRAM), synchronized dynamic random access memory (SDRAM), flash memory, etc. Application memory 1464 may provide storage for application processor 1450. For example, application memory 1464 may store data and/or instructions for operating programs that run on application processor 1450.
[00133] Application processor 1450 may be coupled to a display controller 1466, which in turn may be coupled to a monitor 1468. The display controller 1466 may be a block of hardware that is used to generate images on the display. 1468 monitor. For example, the 1466 monitor controller can translate the instructions and/or data of the 1450 application processor into images that can be displayed on the 1468 monitor. Examples of the 1468 monitor include liquid crystal display (LCD) panels, emitting diode (LED) displays, cathode ray tube (CRT) displays, plasma displays, etc.
[00134] Application processor 1450 may be coupled to a baseband processor 1452. Baseband processor 1452 generally processes communication signals. For example, baseband processor 1452 can demodulate and/or decode received signals. Additionally or alternatively, baseband processor 1452 may encode and/or modulate signals in preparation for transmission.
[00135] The baseband processor 1452 may include a reference subframe determination module 1406. The reference subframe determination module 1406 illustrated in Fig. 14 may be an example of the reference subframe determination module in Fig. 106 illustrated in Figure 1. The reference subframe determination module 1406 may be configured to perform one or more of the methods 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300 described above.
[00136] Baseband processor 1452 may be coupled to baseband memory 1470. Baseband memory 1470 may be any electronic device capable of storing electronic information, such as SDRAM, DDRAM, flash memory, etc. Baseband processor 1452 may read information from (e.g., instructions and/or data) and/or write information to baseband memory 1470. Additionally or alternatively, baseband processor 1452 may use instructions and/or data stored in baseband memory 1470 to perform communication operations.
[00137] The baseband processor 1452 may be coupled to a radio frequency (RF) transceiver 1412. The RF transceiver 1412 may be coupled to a power amplifier 1454 and to one or more antennas 1414. RF 1412 can transmit and/or receive radio frequency signals. For example, RF transceiver 1412 may transmit an RF signal using a power amplifier 1454 and one or more antennas 1414. RF transceiver 1412 may also receive RF signals using one or more antennas 1414.
[00138] Figure 15 illustrates certain components that may be included in a wireless communication device 1502. One or more of the wireless communication devices 102, 1402 described above may be configured similarly to the wireless communication device 1502 which is illustrated in Figure 15. Wireless communication device 1502 includes a processor 1588. Processor 1588 may be a general purpose multi-chip or single chip microprocessor (e.g., an ARM), a special-purpose microprocessor (e.g., a digital signal processor (DSP)), a micro controller, a programmable gate assembly, etc. The 1588 processor may be referred to as a central processing unit (CPU). Although only a single processor 1588 is illustrated in the wireless communication device 1502 of Figure 15, in an alternative configuration, a combination of processors (eg, an ARM and DSP) can be used.
[00139] Wireless communication device 1502 also includes memory 1572 in electronic communication with processor 1588 (i.e., processor 1588 can read information from and/or write information to memory 1572). The 1572 memory can be any electronic component capable of storing electronic information. 1572 memory can be random access memory (RAM), read-only memory (ROM), magnetic disk storage media, optical storage media, flash memory devices in RAM, built-in memory included with the processor, read-only memory programmable only (PROM), erasable programmable read-only memory (EPROM), electrically erasable PROM (EEPROM), registers, and so on, including any combination thereof.
[00140] Data 1574a and instructions 1576a may be stored in memory 1572. Instructions 1576a may include one or more programs, routines, subroutines, functions, procedures, etc. 1576a instructions can include a single computer-readable statement or many computer-readable statements. Instructions 1576a may be executable by processor 1588 to implement one or more of the methods that have been described above. Executing instructions 1576a may involve using data 1574a that is stored in memory 1572. Fig. 15 illustrates some instructions 1576b and data 1574b being loaded into processor 1588.
[00141] Wireless communication device 1502 may also include a transmitter 1584 and a receiver 1586 to allow the transmission and reception of signals between the wireless communication device 1502 and a remote location (e.g., a base station or other device). wireless communication). Transmitter 1584 and receiver 1586 may collectively be referred to as a transceiver 1582. An antenna 1580 may be electrically coupled to transceiver 1582. Wireless communication device 1502 may also include (not shown) multiple transmitters, multiple receivers, multiple transceivers, and /or multiple antennas.
[00142] The various components of the wireless communication device 1502 may be coupled together by one or more buses, which may include a power bus, a control signal bus, a status signal bus, a data bus, etc. For simplicity, the various buses are illustrated in figure 15 as a 1578 bus system.
[00143] Figure 16 illustrates certain components that may be included within a base station 1622. The base station 122 described above may be configured similarly to the base station 1622 illustrated in Figure 16. The base station 1622 includes a processor 1607. The 1607 processor can be a general-purpose single-chip or multiple-chip microprocessor (e.g., an ARM), a special-purpose microprocessor (e.g., a digital signal processor (DSP)), a microcontroller, a set of programmable port etc. Processor 1607 may be referred to as a central processing unit (CPU). Although only a single processor 1607 is illustrated in the base station 1622 of Figure 16, in an alternative configuration, a combination of processors (eg, an ARM and DSP) can be used.
[00144] Base station 1622 also includes memory 1690 in electronic communication with processor 1607 (i.e., processor 1607 can read information from and/or write information to memory 1690). The 1690 memory can be any electronic component capable of storing electronic information. 1690 memory can be random access memory (RAM), read-only memory (ROM), magnetic disk storage media, optical storage media, flash memory devices in RAM, built-in memory included with the processor, read-only memory programmable only (PROM), programmable and erasable read-only memory (EPROM), the electrically erasable PROM (EEPROM), registers and so on, including combinations thereof.
[00145] Data 1692a and instructions 1694a may be stored in memory 1690. Instructions 1694a may include one or more programs, routines, subroutines, functions, procedures, etc. 1694a instructions can include a single computer-readable statement or many computer-readable statements. Instructions 1694a may be executable by processor 1607. Execution of instructions 1694a may involve the use of data 1692a that is stored in memory 1690. Fig. 16 illustrates some instructions 1694b and data 1692b being loaded into processor 1607.
[00146] Base station 1622 may also include a transmitter 1601 and a receiver 1603 to allow transmission and reception of signals between the base station 1622 and a remote location (eg, a wireless communication device). Transmitter 1601 and receiver 1603 may collectively be referred to as a transceiver 1698. An antenna 1696 may be electrically coupled to transceiver 1698. Base station 1622 may also include (not shown) multiple transmitters, multiple receivers, multiple transceivers, and/or multiple antennas.
[00147] The various components of base station 1622 may be coupled by one or more buses, which may include a power bus, a control signal bus, a status signal bus, a data bus, etc. For simplicity, the various buses are illustrated in figure 16 with a 1605 bus system.
[00148] In the description above, numerical references were sometimes used in connection with various terms. Where a term is used in relation to a numerical reference, it may refer to a specific element that is illustrated in one or more of the figures. Where a term is used without a numerical reference, this may refer generally to the term without limitation to any particular figure.
[00149] The term “determining” encompasses a wide variety of actions, and therefore “determining” may include calculating, computing, processing, deriving, investigating, querying (e.g., querying a table, database, or other data structure). data), determining and the like. Furthermore, "determining" may include receiving (eg, receiving information), accessing (eg, accessing data in a memory), and the like. Also, "determining" may include resolving, selecting, choosing, establishing, and the like.
[00150] The phrase “based on” does not mean “based on only”, unless expressly specified otherwise. In other words, the phrase “based on” describes both “based only on” and “based on at least”.
[00151] The functions described here can be stored as one or more instructions on a processor-readable or computer-readable medium. The term “computer-readable medium” refers to any available medium that can be accessed by a computer or processor. By way of example, and not limitation, such medium may comprise RAM, ROM, EEPROM, flash memory, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store desired program code in the form of instructions or data structures that can be accessed by a computer. Floppy disk and disk, as used herein, include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk, and Blu-ray® disk where floppy disks normally play the data magnetically, while the discs play the data optically with lasers. It should be noted that a computer-readable medium can be tangible and not transitory. The term “computer program product” refers to a computing device or processor in combination with code or instructions (eg, a “program”) that can be executed, processed or computerized by the computing device or processor. As used herein, the term "code" may refer to software, instructions, code, or data that are executable by a computing device or processor.
[00152] Software or instructions can also be transmitted via a transmission medium. For example, if the software is transmitted from a network site, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of a transmission medium.
[00153] The methods described here comprise one or more steps or actions to achieve the method described. Method and/or action steps may be interchanged with one another without departing from the scope of claims. In other words, unless a specific order of steps or actions is required for the proper operation of the method being described, the order and/or use of specific steps and/or actions can be modified without departing from the scope of the claims.
[00154] It should be understood that the claims are not to be limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made to the arrangement, operation, and details of the systems, methods, and apparatus described herein without departing from the scope of the claims.

权利要求:
Claims (15)
[0001]
1. Method for determining a subframe of reference in a wireless communication device, comprising: determining (302) a subframe of reporting n; determining (304) a subframe of reference n-reference based on a threshold and at least at least one limiting criterion, where nreference is a difference in the number of subframes between the reporting subframe and the reference subframe, where the threshold limits a range of values for nreference, where the at least one limiting criterion is a or more additional conditions that are used to determine the reference subframe, wherein the at least one limiting criterion comprises: limiting the limit to a difference between the reporting subframe n and a downlink control information subframe; limiting nreference to a value that is less than or equal to a difference between the reporting subframe n and a downlink control information subframe; limit nreference to a value such that n -nreference matches a downlink control information subframe number or corresponding to a predetermined subframe number; a downlink subframe comprising a channel state information reference signal; or a downlink subframe which is a determined subframe type; generating (306) a report based on the reference subframe if the reference subframe is determined; and send (308) the report during the reporting subframe if the reference subframe is determined.
[0002]
Method according to claim 1, characterized in that the at least one limiting criterion additionally comprises aperiodic triggering.
[0003]
Method according to claim 2, characterized in that the at least one limiting criterion additionally comprises an upper limit.
[0004]
Method according to claim 1, characterized in that the threshold is L and that nreference is a smaller value greater than or equal to the threshold that corresponds to a valid downlink subframe, and at least one limiting criterion comprises limiting L to the difference between the reporting subframe and the downlink control information subframe.
[0005]
Method according to claim 4, characterized in that at least one limiting criterion additionally comprises an upper limit.
[0006]
Method according to claim 1, characterized in that the threshold is 4 and in that nreference is a smaller value greater than or equal to the threshold corresponding to a valid downlink subframe, and at least one limiting criterion comprises limiting nreference to the value which is less than or equal to the difference between the reporting subframe and the downlink control information subframe.
[0007]
Method according to claim 1, characterized in that the threshold is 4 and in that nreference is a smaller value greater than or equal to the threshold corresponding to a valid downlink subframe, and at least one limiting criterion comprises limiting nreference to the value such that n-reference corresponds to the subframe number of downlink control information or corresponds to the predetermined number of subframe.
[0008]
Method according to claim 1, characterized in that the threshold is k and nreference is a smaller value greater than or equal to the threshold corresponding to a valid downlink subframe, and at least one limiting criterion comprises limiting nreference to the value that is less than or equal to the difference between the reporting subframe and the downlink control information subframe.
[0009]
Method according to claim 8, characterized in that k is limited to a minimum value.
[0010]
Method according to claim 1, characterized in that the threshold is k and nreference is a smaller value greater than or equal to the threshold that corresponds to a valid downlink subframe, and at least one limiting criterion comprises the downlink subframe that comprises the channel state information reference signal.
[0011]
Method according to claim 1, characterized in that the threshold is ki and that nreference is greater than or equal to the threshold and corresponds to a valid first downlink subframe, and at least one threshold criterion comprises the information reference signal of channel state, and by the method further comprising determining a second subframe of reference n-nreference2 based on a second threshold, by the second threshold being k2 and by nreference2 being greater than or equal to the second threshold and corresponding to a second valid downlink subframe .
[0012]
Method according to claim 1, characterized in that the threshold is k and nreference is a smaller value greater than or equal to the threshold that corresponds to a valid downlink subframe, and at least one limiting criterion comprises the downlink subframe that is the given subframe type.
[0013]
Method according to claim 1, characterized in that the threshold is ki and in that nreference is the smallest value greater than or equal to the threshold corresponding to a valid downlink subframe of the given subframe type, and at least one limiting criterion comprising using the downlink subframe of the given type, and the method further comprising determining a second subframe of reference n-n-reference2 based on a second threshold, in that the second threshold is k2 and by nreference2 is a value greater than or equal to the second threshold that corresponds to a second valid downlink subframe.
[0014]
14. Apparatus for determining a subframe of reference, comprising: mechanisms for determining (302) a subframe of reporting n; mechanisms for determining (304) a subframe of n-reference based on a threshold and at least one limiting criterion, where nreference is a difference in the number of subframes between the reporting subframe and the reference subframe, where the threshold limits a range of values for nreference, where the at least one limiting criterion is one or more additional conditions that are used to determine the reference subframe, wherein the at least one limiting criterion comprises: limiting the limit to a difference between the reporting subframe n and a downlink control information subframe; limiting nreference to a value that is less than or equal to a difference between the reporting subframe n and a downlink control information subframe; limit nreference to a value such that n - nreference corresponds to a number downlink control information subframe ro or corresponds to a predetermined number of subframes; a downlink subframe comprising a channel state information reference signal; or a downlink subframe which is a given subframe type; mechanisms for generating (306) a report based on the subframe of reference if the subframe of reference is determined; mechanisms for sending (308) the report during the reporting subframe if the reference subframe is determined.
[0015]
15. Memory characterized by comprising instructions which, when executed, cause at least one computer to perform a method as defined in any one of claims 1 to 13.

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法律状态:
2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2022-02-15| 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 04/10/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |

优先权:

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申请号 | 申请日 | 专利标题

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US38959110P| true| 2010-10-04|2010-10-04|

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