WO2012094930A1 - 反馈信道状态信息的方法和用户设备 - Google Patents
反馈信道状态信息的方法和用户设备 Download PDFInfo
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- WO2012094930A1 WO2012094930A1 PCT/CN2011/083381 CN2011083381W WO2012094930A1 WO 2012094930 A1 WO2012094930 A1 WO 2012094930A1 CN 2011083381 W CN2011083381 W CN 2011083381W WO 2012094930 A1 WO2012094930 A1 WO 2012094930A1
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- feedback
- parameter
- feedback mode
- pmi
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0031—Multiple signaling transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- the present invention relates to the field of mobile wireless communications, and more particularly to a method and user equipment for feedback channel state information for a particular transmission mode in a wireless communication system.
- a base station side for example, an evolved Node B or an eNB
- spatial multiplexing may be used to increase the data transmission rate, that is, the same time-frequency resource is used at the transmitting end.
- Different antenna locations transmit different data
- the receiving end eg, user equipment UE
- the receiving end also uses multiple antennas to receive data.
- resources of all antennas are allocated to the same user. The user occupies the physical resources allocated by the base station side in a single transmission interval.
- This type of transmission is called single-user multiple-input and multiple-out (Single User Multiple- Input Multiple-Out-put (SU-MIMO for short); allocates spatial resources of different antennas to different users in the case of multiple users, and one user and at least one other user share physical resources allocated by the base station side in one transmission interval, sharing
- the mode may be a space division multiple access mode or a space division multiplexing mode.
- the transmission mode is called Multiple User Multiple-Input Multiple-Out-put (MU-MIMO), where the base station side allocates Physical resources refer to time-frequency resources. If the transmission system is to support both SU-MIMO and MU-MIMO, the eNB needs to provide the UE with data in these two modes.
- the eNB When the UE is in the SU-MIMO mode or the MU-MIMO mode, it is necessary to know the rank (Rank) used by the eNB to transmit MIMO data to the UE.
- Rank the rank used by the eNB to transmit MIMO data to the UE.
- all antenna resources are allocated to the same user, and the number of layers used to transmit MIMO data is equal to the rank used by the eNB to transmit MIMO data; corresponding to the layer used by a user for transmission in MU-MIMO mode. The number is less than the total number of layers of MIMO data transmitted by the eNB. If SU-MIMO mode and MU-MIMO handover are to be performed, the eNB needs to notify the UE of different control data in different transmission modes.
- the control signaling required for uplink transmission has a correct/error acknowledgement message (ACK/NACK: Acknowledgement/Negative Acknowledgement) and information reflecting the state of the downlink physical channel (CSI: Channel State).
- ACK/NACK Acknowledgement/Negative Acknowledgement
- CSI Channel State
- CQI Channels quality indication
- PMI Precoding matrix indicator
- RI rank Indicator
- the ACK/NACK response message is transmitted on the physical uplink control channel (PUCCH: Physical Uplink Control Channel) in the format 1/1 a/lb (PUCCH format 1/lal/b), if the terminal (UE: User Equipment)
- PUCCH Physical Uplink Control Channel
- UE User Equipment
- the uplink data is transmitted on the Physical Uplink Shared Channel (PUSCH).
- the feedback of the CQI/PMI and RI may be periodic feedback or non-periodic feedback. The specific feedback is as follows. 1 is shown:
- the cyclic feedback CQI/PMI, RI if the UE does not need to send uplink data, the cyclic feedback CQI/PMI, RI is in the format 2/2a/2b (PUCCH format2/2a/2b) on the PUCCH. Transmission, if the UE needs to send uplink data, then CQI/PMI, RI is transmitted on PUSCH; for non-periodic feedback CQI/PMI, RI is only transmitted on PUSCH.
- the following three types of downlink physical control channels are defined in the Release 8 (Release 8) standard: Physical Control Format Indicator Channel (PCFICH), Physical Hybrid Automatic Repeat Request Direction Channel (Physical Hybrid) The automatic retransmission request indicator channel (PHICH) and the physical downlink control channel (Physical Downlink Control Channel, PDCCH for short).
- the PDCCH is used to carry downlink control information (Downlink Control Information, DCI for short), and includes: uplink and downlink scheduling information, and uplink power control information.
- the DCI format (DCI format) is divided into the following types: DCI format 0, DCI format 1, DCI format 1A, DCI format IB, DCI format 1C, DCI format 1D, DCI format 2, DCI format 2A, DCI format 3, and DCI Format 3A, etc.
- the transmission mode 5 supporting MU-MIMO utilizes the downlink control information of the DCI format ID, and the downlink power domain (Downlink power offset field) ⁇ power . offset in the DCI format ID is used to indicate the MU-MIMO mode.
- MU-MIMO transmission mode 5 can support the dynamics of SU-MIMO mode and MU-MIMO mode. Switching, but this DCI format supports only one stream transmission for one UE, whether in SU-MIMO mode or MU-MIMO mode, although LTE Release 8 supports single-user transmission of up to two streams in transmission mode 4, but because of the transmission mode The switching between the two can only be semi-static, so in LTE Release 8, dynamic switching of single-user multi-stream transmission and multi-user transmission cannot be achieved.
- a dual-stream beamforming (Beamforming) transmission mode is introduced, defined as transmission mode 9, and downlink control information is added to DCI format 2B to support such transmission.
- DCI format 2B there is a scrambling identity (SCID) identification bit to support two different scrambling code sequences, and the eNB can allocate the two scrambling code sequences to different users, in the same resource. Reuse multiple users.
- SCID scrambling identity
- the new data indication (NDI) bit corresponding to the non-enabled (Transabled) transport block is also used to indicate the antenna port for single layer transmission.
- a new closed-loop spatial multiplexing transmission mode is added, defined as transmission mode 10, which can support single-user MIMO. It can support multi-user MIMO and can support dynamic switching between the two.
- this transmission mode also supports 8-antenna transmission.
- This new transmission mode has determined the Demodulation Reference Signal (DMRS) for demodulation pilots, and the UE needs to obtain the pilot position before channel and interference can be performed on the pilot.
- DMRS Demodulation Reference Signal
- the total number of layers of different transmissions has different pilot patterns. For example, in LTE version number 10, three different patterns (DMRS Pattern) are initially determined. When the total number of layers or rank is 1 or 2, the first one is used.
- DMRS pattern 1 the total number of layers or ranks transmitted is 3 or 4 with the second pattern (DMRS pattern 2 ), and the total number of layers or ranks transmitted is any one of 5 to 8 with a third Pattern (DMRS pattern 3).
- DMRS pattern 2 the total number of layers or ranks transmitted is 3 or 4 with the second pattern
- DMRS pattern 3 the total number of layers or ranks transmitted is any one of 5 to 8 with a third Pattern (DMRS pattern 3).
- the UE is semi-statically set by higher layer signaling to be based on one of the following transmission modes, in accordance with the indication of the PDCCH of the user equipment-specific (UE-Specific) search space.
- PDSCH Physical Downlink Shared Channel
- Mode 1 Single antenna port; Port 0 ( Single-antenna port; port 0 )
- Mode 5 Multi-user Multiple Input Multiple Output (Multi-user MIMO)
- Mode 7 Single antenna port; Port 5 (Single-antenna port; port 5)
- Mode 8 Dual stream transmission, ie dual stream beamforming
- Mode 9 Up to 8 layers of closed loop spatial multiplexing.
- the transmission mode 9 supports the mode 1-1 and the mode 2-1 feedback mode.
- the feedback mode further includes submode 1 and submodule 2, which are distinguished by the high layer configuration signal PUCCH_formatl-1_CSI_report_mode.
- the transmission mode 9 needs to support three feedback modes, namely mode 1-2, mode 2-2 and mode 3-1.
- a transmission mode 9 and a CSI-RS (Channel-State Information - Reference Symbol) are newly added, and a transmission mode 9 is a channel measurement based on a CSI-RS, thereby calculating a CQI.
- Other transmission modes are based on CRS for channel measurement to calculate CQI.
- some CSI-RS parameters have also been added to characterize their properties. Compared to the CRS in R8, some parameters are similar, and some parameters are new. For example, the number of CSI-RS ports also has a similar number of CRS ports in R8, and the CSI-RS subframe configuration period parameters are new.
- the following parameters are cell-specific and configured by higher layer signaling for CSI-RS definition, including: CSI-RS port number, CSI-RS configuration, CSI-RS subframe configuration parameter ICSI-RS, subframe configuration
- CSI-RS port number CSI-RS configuration
- CSI-RS subframe configuration parameter ICSI-RS CSI-RS subframe configuration
- ICSI-RS CSI-RS subframe configuration
- subframe configuration The periodic TCSI-RS, the subframe offset, and the assumption of the UE's reference PDSCH transmit power for CSI feedback are set.
- the present invention provides a method for feeding back channel state information, the method comprising:
- PMI precoding matrix indication
- RI rank indication
- the user equipment feeds back channel state information according to the determined feedback mode. Determining, by the user equipment, a second parameter y of the feedback mode according to the number of ports of the CSI-RS, where the second parameter y of the feedback mode is 0 if the number of ports of the CSI-RS is 1.
- the number of ports of the CSI-RS is greater than 1, and the second parameter y of the feedback mode is greater than 0;
- the transmission mode of the high-level signaling configuration is the transmission mode 9; in the step of the user equipment feeding back the channel state information according to the determined feedback mode, if the second parameter y of the feedback mode is 0, the user equipment does not feedback PMI and RI, if the second parameter y of the feedback mode is greater than 0, the user equipment feeds back PMI and RI.
- the second parameter y of the feedback mode Determining, by the user equipment, the second parameter y of the feedback mode according to the number of ports of the CSI-RS and the indication information, where: if the number of ports of the CSI-RS is 1, the second parameter of the feedback mode If the number of ports of the CSI-RS is greater than 1, and the indication information indicates that the PMI and the RI are not fed back, the second parameter y of the feedback mode is 0;
- the second parameter y of the feedback mode is greater than 0;
- the transmission mode of the high layer signaling configuration is a transmission mode 9;
- the user equipment In the step of the user equipment feeding back the channel state information according to the determined feedback mode, if the second parameter y of the feedback mode is 0, the user equipment does not feed back PMI and RI, if the second parameter y of the feedback mode If it is greater than 0, the user equipment feeds back PMI and RI. Determining, by the user equipment, the second parameter y of the feedback mode according to the number of ports of the CSI-RS and the indication information, where: if the indication information indicates that the PMI and the RI are not fed back, the second parameter of the feedback mode y is
- the second parameter y of the feedback mode is 0;
- the indication information indicates that the PMI and the RI are fed back and the number of ports of the CSI-RS is greater than 1, the second parameter y of the feedback mode is greater than 0;
- the transmission mode of the high layer signaling configuration is a transmission mode 9;
- the step of the user equipment feeding back channel state information according to the determined feedback mode if the second parameter y of the feedback mode is 0, the user equipment does not feed back PMI and RI, if the feedback mode The second parameter y of the formula is greater than 0, and the user equipment feeds back PMI and RI.
- the step of determining the feedback mode according to the transmission mode of the high layer signaling configuration, the first parameter X of the feedback mode, and the second parameter y of the feedback mode includes:
- the feedback mode is determined respectively.
- the transmission mode of the high-level signaling configuration is the transmission mode 9, and the first parameter X of the feedback mode is respectively 1 or 2
- the feedback mode is determined to be mode 1-1 or mode 2-1, respectively.
- the step of determining the feedback mode according to the transmission mode of the high layer signaling configuration, the first parameter X of the feedback mode, and the second parameter y of the feedback mode includes:
- the transmission mode of the higher layer signaling configuration is the transmission mode 9, and the first parameter X of the feedback mode is 1, 2 or 3, then determining The feedback mode is mode 1-0, mode 2-0 or mode 3-0; if the second parameter y of the determined feedback mode is greater than 0, the transmission mode of the higher layer signaling configuration is transmission mode 9, and the feedback The first parameter X of the mode is 1, 2 or 3 respectively, and then the feedback mode is determined to be mode 1-2, mode 2-2 or mode 3-1, respectively.
- the invention also provides a user equipment, comprising:
- a second parameter determining module configured to: the number of ports of the channel state indication reference signal (CSI-RS) configured according to the high layer signaling or the number of ports according to the CSI-RS and whether to indicate a precoding matrix indication (PMI) And the indication information of the rank indication (RI) determines a second parameter y of the feedback mode;
- the feedback mode determining module is configured to be configured according to the transmission mode of the high layer signaling, the first parameter X of the feedback mode, and the feedback mode The second parameter y determines the feedback mode;
- a feedback module configured to: feedback feedback channel state information determined by the module according to the feedback mode determining module.
- the second parameter determining module is configured to determine, when the second parameter y of the feedback mode is determined according to the number of ports of the CSI-RS, if the number of ports of the CSI-RS is 1, determine the The second parameter y is 0. If the number of ports of the CSI-RS is greater than 1, the feedback mode is determined. The second parameter y is greater than 0; the feedback module is configured to feed back channel state information by: when the transmission mode of the high layer signaling configuration is the transmission mode 9, if the second parameter y of the feedback mode If it is 0, PMI and RI are not fed back. If the second parameter y of the feedback mode is greater than 0, PMI and RI are fed back.
- the second parameter determining module is configured to, when determining a second parameter y of the feedback mode according to the number of ports of the CSI-RS and the indication information,
- the second parameter y of the feedback mode is 0; If the number of ports of the CSI-RS is 1, determining that the second parameter y of the feedback mode is 0; if the number of ports of the CSI-RS is greater than 1, and the indication information indicates that PMI and RI are not fed back, determining feedback The second parameter y of the mode is 0;
- the feedback module is configured to feed back channel state information by: when the transmission mode of the high layer signaling configuration is the transmission mode 9, if the second parameter y of the feedback mode is 0, the PMI and the RI are not fed back. If the second parameter y of the feedback mode is greater than 0, the PMI and the RI are fed back.
- the second parameter determining module is configured to set a second parameter y of the feedback mode according to the number of ports of the CSI-RS and the indication information,
- the indication information indicates that the PMI and the RI are fed back and the number of ports of the CSI-RS is 1, determining that the second parameter y of the feedback mode is 0;
- the indication information indicates feedback PMI and RI and the number of ports of the CSI-RS is greater than 1, determining that the second parameter y of the feedback mode is greater than 0;
- the feedback module is configured to feed back channel state information by: when the transmission mode of the high layer signaling configuration is the transmission mode 9, if the second parameter y of the feedback mode is 0, the PMI and the RI are not fed back. If the second parameter y of the feedback mode is greater than 0, the PMI and the RI are fed back.
- the feedback mode determining module is configured to determine the feedback mode by: In the case of periodic feedback, if the second parameter y of the feedback mode is 0, the transmission mode of the high-level signaling configuration is the transmission mode 9, and the first parameter X of the feedback mode is 1 or 2, the feedback mode is determined to be Mode 1-0 or mode 2-0; if the second parameter y of the feedback mode is greater than 0, the transmission mode of the high layer signaling configuration is transmission mode 9, and the first parameter X of the feedback mode is 1 or 2 respectively , determining that the feedback mode is mode 1-1 or mode 2-1;
- the transmission mode of the high-level signaling configuration is the transmission mode 9
- the first parameter X of the feedback mode is 1, 2 or 3
- the feedback is determined.
- the mode is respectively mode 1-0, mode 2-0 or mode 3-0; if the second parameter y of the feedback mode is greater than 0, the transmission mode of the higher layer signaling configuration is transmission mode 9, and the mode of the feedback mode If a parameter X is 1, 2 or 3 respectively, then the feedback mode is determined to be mode 1-2, mode 2-2 or mode 3-1, respectively.
- the present invention determines whether a feedback PMI/RI is needed according to the number of CSI-RS ports configured by higher layer signaling or according to the number of ports of the CSI-RS and indication information indicating whether to feed back a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI). Therefore, transmission mode 9 can support switching of two feedback mode types, improving system flexibility, performance, and reducing feedback overhead.
- PMI Precoding Matrix Indicator
- RI Rank Indicator
- FIG. 1 is a schematic diagram of a method of feeding back channel state information according to the present invention.
- FIG. 2 is a block diagram showing the structure of a user equipment of the present invention. Preferred embodiment of the invention
- the present invention determines whether a feedback PMI/RI is needed according to the number of CSI-RS ports configured by higher layer signaling or according to the number of ports of the CSI-RS and indication information indicating whether to feed back a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI). Therefore, transmission mode 9 can support switching of two feedback mode types, improving system flexibility, performance, and reducing feedback overhead.
- PMI Precoding Matrix Indicator
- RI Rank Indicator
- the method for feeding back channel state information according to the present invention includes:
- Step 101 The user equipment determines the feedback mode according to the number of ports of the CSI-RS configured according to the high layer signaling or according to the number of ports of the CSI-RS and indication information indicating whether to feed back a precoding matrix indication (PMI) and a rank indication (RI).
- Second parameter y The base station configures parameters of the CSI-RS through the high layer signaling, including the number of ports of the CSI-RS; and the user equipment determines the number of ports of the current CSI-RS according to the configured high layer signaling.
- the feedback mode is represented by the mode xy.
- X is the first parameter of the feedback mode
- Step 102 The user equipment determines a feedback mode according to the transmission mode of the high layer signaling configuration, the first parameter X of the feedback mode, and the second parameter y of the feedback mode.
- the current transmission mode and the value of X can be directly determined.
- the transmission mode of the high-level signaling configuration is the transmission mode 9, and when the first parameter X of the feedback mode is 1 or 2, it is determined.
- the feedback mode is mode 1-0 or mode 2-0; if the determined feedback mode second parameter y is greater than 0, the transmission mode of the higher layer signaling configuration is transmission mode 9, and the first parameter X of the feedback mode If they are 1 or 2 respectively, the determined feedback modes are mode 1-1 or mode 2-1, respectively.
- the transmission mode of the high-level signaling configuration is the transmission mode 9, and when the first parameter X of the feedback mode is 1, 2 or 3, it is determined.
- the feedback mode is mode 1-0, mode 2-0 or mode 3-0; if the determined feedback mode is second The parameter y is greater than 0, the transmission mode of the high-level signaling configuration is the transmission mode 9, and the first parameter X of the feedback mode is 1, 2 or 3 respectively, and the determined feedback modes are mode 1-2, mode 2, respectively. -2 or mode 3-1.
- periodic feedback is provided if the physical uplink control channel (PUCCH) is fed back, and aperiodic feedback is provided if the physical uplink shared channel (PUSCH) feedback is used.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- the user equipment determines whether to feed back the PMI/RL according to the number of CSI-RS ports.
- Step 103 The user equipment feeds back corresponding channel state information according to the determined feedback mode.
- the user equipment determines the second parameter y of the feedback mode according to the number of ports of the CSI-RS, an example is shown in Embodiments 1 and 2 below.
- the feedback is as follows:
- the transmission mode of the high-level signaling configuration is the transmission mode 9
- the second parameter y of the feedback mode is 0, and the user equipment does not feed back the precoding matrix indication.
- PMI precoding matrix indication
- RI rank indication
- the following two implementation schemes are:
- the transmission mode of the high-level signaling configuration is the transmission mode 9, where:
- the second parameter y of the feedback mode is 0, and the user equipment does not feed back PMI and RI. In this case, y is determined regardless of the content of the indication information. 0;
- the second parameter y of the feedback mode is 0, and the user equipment does not feed back the PMI and the RI;
- the second parameter y of the feedback mode is greater than 0, and the user equipment feeds back PMI and RI.
- the transmission mode of the high-level signaling configuration is When the mode is 9, where:
- the second parameter y of the feedback mode is 0, and the user equipment does not feed back the PMI and the RI. In this case, whether the number of ports is 1, the y is determined. Is 0;
- the indication information indicates that the PMI and the RI are fed back and the number of ports of the CSI-RS is 1, the second parameter y of the feedback mode is 0, and the user equipment does not feed back the PMI and the RI;
- the indication information indicates that the PMI and the RI are fed back and the number of ports of the CSI-RS is greater than 1, the second parameter y of the feedback mode is greater than 0, and the user equipment feeds back the PMI and the RI.
- the feedback report is also different when the determined feedback modes are different, and the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
- the base station configures a UE with transmission mode 9
- the UE's PDSCH transmission strategy supports up to 8 layers of closed-loop spatial multiplexing.
- the base station configures eight CSI-RS ports for the UE, and the CSI-RS port numbers are 15, 16, 17, 18, 19, 20, 21, and 22.
- the process for the user equipment to feed back channel state information includes the following steps:
- the user equipment determines that the number of ports of the CSI-RS is 8 according to the high-level signaling, and determines whether there is PMI/RI feedback according to the number of CSI-RS ports. Specifically, the number of ports of the current CSI-RS is equal to 8, which is obviously greater than 1, so Select the feedback mode with PMI/RI, so there is y>0. ;
- the user determines the current transmission mode according to the high layer signaling, and the current transmission mode is 9; the user equipment determines the current feedback mode according to the y determined by the number of ports in the high layer signaling, the number of ports of the CSI-RS, and the current transmission mode;
- the UE can directly determine X according to the high layer signaling, and determine y>0 according to the number of CSI-RS ports, according to the obtained
- the x and y select a mode from the mode 1-1, mode 2-1 feedback mode, and the feedback mode is the mode xl.
- X is equal to 1 or 2.
- This feedback is the pattern x0-y0.
- the user equipment determines that there is PMI/RI feedback according to whether the number of CSI-RS ports is equal to 8 whether the high-level signaling is configured with or without PMI/RI indication signaling;
- the user equipment feeds back channel state information according to the determined feedback mode.
- the PUCCH_formatl-1-CSI-report_mode (PUCCH mode 1-1 channel state information reporting sub-mode distinguishing parameter) is further used in the higher layer signaling.
- the UE will feed back two reports, one carrying the RI and the first PMI joint coding index information, and the other report carrying the broadband second PMI and wideband CQI information.
- sub-mode 2 the UE will feed back two reports, the first one including the RI information, and the second one including the first PMI of the broadband, the second PMI of the broadband, and the wideband CQI.
- the determined feedback mode is mode 1-2
- the first ⁇ of the feedback wideband the second ⁇ of the subband of each subband, and the CQI of the wideband.
- aperiodic feedback if the determined feedback mode is mode 2-2, the first PMI of the wideband is fed back, the second PMI of the wideband and the CQI of the wideband, and the second PMI of the M subbands and the CQI of the M subbands.
- the determined feedback mode is mode 3-1, the first PMI of the wideband is fed back and the second PMI of the wideband is calculated, and a wideband CQHi (ie, a wideband CQI index, 4 bits) is calculated and fed back for each codeword, Each subband calculates and feeds back a subband CQI value, which is assumed to be used on all subbands when calculating the CQI.
- a wideband CQHi ie, a wideband CQI index, 4 bits
- the base station configures a UE with transmission mode 9
- the UE's PDSCH transmission strategy supports up to 8 layers of closed-loop spatial multiplexing.
- the base station configures only one CSI-RS port for the UE, and the CSI-RS port number is 15.
- the process for the user equipment to feed back channel state information includes the following steps:
- the user equipment determines that the number of ports of the CSI-RS is 1 according to the high-level configuration signaling.
- the user determines the current transmission mode according to the high layer configuration signaling, and the current transmission mode is 9, determining the current feedback mode according to the y determined by the number of ports in the high layer signaling, the number of ports of the CSI-RS, and the current transmission mode;
- the user equipment determines whether there is no PMI/RI feedback according to whether the number of CSI-RS ports is equal to 1 whether the high-level signaling is configured with or without PMI/RI indication signaling;
- This feedback mode is mode x-0. Where ⁇ is equal to 1 or 2.
- ⁇ is equal to 1 or 2 or 3.
- the user equipment feeds back channel state information according to the determined feedback mode.
- the UE During periodic feedback, if the determined feedback mode is mode 1-0, the UE will feed back the wideband CQI information; if the determined feedback mode is mode 2-0, the UE will feed back the wideband CQI and the selected subband CQI.
- the determined feedback mode is mode 1-0, feedback the wideband CQI; if the determined feedback mode is mode 2-0, feedback the wideband CQI and M subband CQI; if the determined feedback mode is mode 3-0, Calculate and feed back a wideband CQI value (ie, wideband CQI index, 4 bits) for each codeword, and calculate and feed back a subband CQI value for each subband.
- a wideband CQI value ie, wideband CQI index, 4 bits
- the user equipment determines the second parameter of the feedback mode according to the number of ports of the CSI-RS.
- the user equipment determines the second parameter y of the feedback mode according to the number of ports of the CSI-RS and the indication information.
- the base station configures a UE with transmission mode 9
- the UE's PDSCH transmission strategy supports up to 8 layers of closed-loop spatial multiplexing.
- the base station configures eight CSI-RS ports for the UE, and the CSI-RS port numbers are 15, 16, 17, 18, 19, 20, 21, and 22.
- the process for the user equipment to feed back channel state information includes the following steps:
- the user equipment determines, according to the high-level signaling, that the number of ports of the CSI-RS is 8, and determines whether to feed back PMI/RI according to the number of CSI-RS ports and indication information, specifically, when the indication information indicates feedback PMI/RI, and because CSI- If the number of RS ports is greater than 1, then the feedback mode of PMI/RI is selected regardless of the scheme 1 or scheme 2 above, and y>0 is determined. ;
- the user determines the current transmission mode according to the high layer signaling, and the current transmission mode is 9; the user equipment determines the current according to the number of x in the high layer signaling, the number of ports of the CSI-RS, the y determined by the high layer signaling, and the current transmission mode.
- Feedback mode
- the UE can directly determine X according to the high layer signaling, according to the number of CSI-RS ports and the high layer signaling. Let y>0, select a mode from mode 1-1 and mode 2-1 feedback mode according to the obtained x and y. This feedback mode is mode xl. Where X is equal to 1 or 2.
- the user equipment feeds back channel state information according to the determined feedback mode.
- the PUCCH_formatl-1-CSI-report_mode (PUCCH mode 1-1 channel state information reporting sub-mode distinguishing parameter) is further used in the higher layer signaling.
- the UE will feed back two reports, one carrying the RI and the first PMI joint coding index information, and the other report carrying the broadband second PMI and wideband CQI information.
- sub-mode 2 the UE will feed back two reports, the first one including the RI information, and the second one including the first PMI of the broadband, the second PMI of the broadband, and the wideband CQI.
- the determined feedback mode is mode 1-2
- the first ⁇ of the wideband is fed back, the second ⁇ of the subband of each subband, and the CQI of the wideband.
- the determined feedback mode is mode 2-2
- the first PMI of the wideband, the second PMI of the wideband, and the CQI of the wideband are fed back, and the second PMI of the M subbands and the CQI of the M subbands.
- the determined feedback mode is mode 3-1
- the first PMI of the wideband is fed back and the second PMI of the wideband is calculated
- a wideband CQHi ie, a wideband CQI index, 4 bits
- Each subband calculates and feeds back a subband CQI value, which is assumed at all when calculating the CQI
- the previously selected PMI is used on the subband.
- the base station configures a UE with transmission mode 9
- the UE's PDSCH transmission strategy supports up to 8 layers of closed-loop spatial multiplexing.
- the base station configures eight CSI-RS ports for the UE, and the CSI-RS port numbers are 15, 16, 17, 18, 19, 20, 21, and 22.
- the process for the user equipment to feed back channel state information includes the following steps:
- the user determines the current transmission mode according to the high-level configuration signaling, and the current transmission mode is 9. According to the number of ports in the high-level signaling, the number of ports of the CSI-RS, the y determined by the high-level signaling, and the current transmission mode determine the current Feedback mode
- ⁇ is equal to 1 or 2.
- This feedback is the mode x-0.
- ⁇ is equal to 1 or 2 or 3.
- the user equipment feeds back channel state information according to the determined feedback mode.
- the UE During periodic feedback, if the determined feedback mode is mode 1-0, the UE will feed back the wideband CQI information; if the determined feedback mode is mode 2-0, the UE will feed back the wideband CQI and the selected subband CQI.
- the determined feedback mode is mode 1-0, feedback the wideband CQI;
- the feedback mode is mode 2-0, feedback wideband CQI and M subband CQI;
- the determined feedback mode is mode 3-0, calculate and feed back a wideband CQI value for each codeword (ie wideband CQI index, 4bit ), calculate and feed back a subband CQI value for each subband.
- the present invention further provides a user equipment, where the user equipment includes: a second parameter determining module configured to set a port number of a CSI-RS according to high layer signaling or a port according to the CSI-RS The number and the indication information indicating whether to feed back the precoding matrix indication (PMI) and the rank indication (RI) determine the second parameter y of the feedback mode;
- a second parameter determining module configured to set a port number of a CSI-RS according to high layer signaling or a port according to the CSI-RS The number and the indication information indicating whether to feed back the precoding matrix indication (PMI) and the rank indication (RI) determine the second parameter y of the feedback mode;
- a feedback mode determining module configured to determine a feedback mode according to a transmission mode of the high layer signaling configuration, a first parameter X of the feedback mode, and a second parameter y of the feedback mode;
- a feedback module configured to feed back corresponding channel state information according to the feedback mode.
- the second parameter determining module determines a second parameter y of the feedback mode according to the number of ports of the CSI-RS, and when the transmission mode of the high layer signaling configuration is the transmission mode 9, if the CSI-RS If the number of ports is 1, the second parameter y of the feedback mode determined by the second parameter determining module is 0, and the feedback module does not feed back a precoding matrix indication (PMI) and a rank indication (RI); if the CSI- The number of ports of the RS is greater than 1, and the second parameter y of the feedback mode determined by the second parameter determining module is greater than 0, and the feedback module feeds back a precoding matrix indication (PMI) and a rank indication (RI).
- PMI precoding matrix indication
- RI rank indication
- the second parameter determining module determines the second parameter y of the feedback mode according to the number of ports of the CSI-RS and the indication information, and when the transmission mode of the high layer signaling configuration is the transmission mode 9, where:
- the second parameter y of the feedback mode determined by the second parameter determining module is 0, and the feedback module does not feed back PMI and RI;
- the second parameter y of the feedback mode determined by the second parameter determining module is 0, and the feedback module does not feed back the PMI.
- RI RI
- the second parameter y of the feedback mode determined by the second parameter determining module is greater than 0, and the feedback mode The block feeds back PMI and RI.
- the second parameter determining module determines the second parameter y of the feedback mode according to the number of ports of the CSI-RS and the indication information, and when the transmission mode of the high layer signaling configuration is the transmission mode 9, where:
- the second parameter y of the feedback mode determined by the second parameter determination module is 0, and the feedback module does not feed back the PMI and the RI;
- the second parameter y of the feedback mode determined by the second parameter determination module is 0, and the feedback module does not feed back the PMI and RI;
- the second parameter y of the feedback mode determined by the second parameter determining module is greater than 0, and the feedback module feeds back the PMI and the RI. .
- the transmission mode of the high-level signaling configuration is the transmission mode 9, and when the first parameter X of the feedback mode is 1 or 2, it is determined.
- the feedback mode is mode 1-0 or mode 2-0; if the determined feedback mode second parameter y is greater than 0, the transmission mode of the higher layer signaling configuration is transmission mode 9, the first parameter X of the feedback mode If they are 1 or 2 respectively, the determined feedback modes are mode 1-1 or mode 2-1, respectively.
- the transmission mode of the higher layer signaling configuration is the transmission mode 9
- the first parameter X of the feedback mode is 1, 2 or 3
- the determined feedback mode is mode 1-0, mode 2-0, or mode 3-0, respectively; if the determined feedback mode second parameter y is greater than 0, the transmission mode of the high layer signaling configuration is transmission mode 9,
- the first parameter X of the feedback mode is 1, 2 or 3 respectively, and the determined feedback modes are mode 1-2, mode 2-2 or mode 3-1, respectively.
- the indication information described above may be information directly indicating whether to feed back PMI and RI, It may also be information indicating a feedback mode type (a feedback mode type that is divided into a feedback PMI/RI and a feedback mode type that does not feed back PMI/RI), which is not limited by the present invention.
- the present invention uniquely determines the current feedback mode by using the number of CSI-RS ports configured by the high-level signaling or according to the number of ports of the CSI-RS and indication information indicating whether to feed back a precoding matrix indication (PMI) and a rank indication (RI).
- PMI precoding matrix indication
- RI rank indication
- the present invention provides a method for determining the y of the mode xy, which solves the problem of determining the feedback mode, and ensures that the correct channel state information can be selected for feedback during single layer transmission and TDD. Improve system flexibility, performance and reduce feedback overhead. On the other hand, the present invention does not add any system complexity and signaling overhead, and effectively uses the parameters of the CSI-RS in R10, maintaining good compatibility.
- Mode 9 can support switching between two feedback mode types, improving system flexibility, performance, and reducing feedback overhead.
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Description
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Priority Applications (6)
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| KR1020137021009A KR101709960B1 (ko) | 2011-01-12 | 2011-12-02 | 채널 상태 정보의 피드백 방법 및 사용자 장비 |
| ES11855774T ES2886341T3 (es) | 2011-01-12 | 2011-12-02 | Método y equipo de usuario para retroalimentar información de estado de canal |
| EP11855774.3A EP2665220B1 (en) | 2011-01-12 | 2011-12-02 | Method and user equipment for feeding back channel state information |
| KR1020157020354A KR101760357B1 (ko) | 2011-01-12 | 2011-12-02 | 채널 상태 정보의 피드백 방법 및 사용자 장비 |
| JP2013548721A JP5722461B2 (ja) | 2011-01-12 | 2011-12-02 | チャネル状態情報のフィードバック方法及びユーザー装置 |
| US13/979,406 US8929476B2 (en) | 2011-01-12 | 2011-12-02 | Method and user equipment for feeding back channel state information |
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| CN201110005922.8 | 2011-01-12 | ||
| CN201110005922.8A CN102111246B (zh) | 2011-01-12 | 2011-01-12 | 反馈信道状态信息的方法和用户设备 |
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| US (1) | US8929476B2 (zh) |
| EP (1) | EP2665220B1 (zh) |
| JP (1) | JP5722461B2 (zh) |
| KR (2) | KR101709960B1 (zh) |
| CN (1) | CN102111246B (zh) |
| ES (1) | ES2886341T3 (zh) |
| WO (1) | WO2012094930A1 (zh) |
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| ES2886341T3 (es) | 2021-12-17 |
| JP2014507853A (ja) | 2014-03-27 |
| KR20130118365A (ko) | 2013-10-29 |
| EP2665220A4 (en) | 2017-06-21 |
| CN102111246A (zh) | 2011-06-29 |
| KR101760357B1 (ko) | 2017-07-21 |
| CN102111246B (zh) | 2017-03-29 |
| KR101709960B1 (ko) | 2017-02-24 |
| JP5722461B2 (ja) | 2015-05-20 |
| EP2665220A1 (en) | 2013-11-20 |
| US8929476B2 (en) | 2015-01-06 |
| US20130315337A1 (en) | 2013-11-28 |
| EP2665220B1 (en) | 2021-09-01 |
| KR20150091537A (ko) | 2015-08-11 |
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