Abstract
One aspect of the teachings presented herein provides advantages for sending precoder selection feedback (44) from a transceiver (12) to another transceiver (10) for use by the other transceiver (10) as precoding recommendations. The transceiver (12) generates two types of precoder selection feedback (44) where one type uses a smaller signaling payload than the other and therefore provides a distinct reduction in the signaling overhead associated with reporting precoding recommendations. The transceiver (12) uses the reduced-overhead type of reporting when reporting at certain times or on certain channels or in response to control signaling (48). In one example a UE (86) in an LTE network (80) sends precoder information to an eNodeB (84) on the PUCCH by sending smaller-range index values (56) that index only a subset (54) of precoders (28) but sends full-range index values (52) when reporting on the PUSCH which index a larger set (50) of precoders (28).
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Specification Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Resource configuration Channel Status Information(CSI) Reporting Multiple-Input Multiple-Output(MIMO)/Massive MIMO
Product
User Equipment (UE/Terminal)Base Station (eNB/gNB)
Use Cases
Wireless communication
Services
Data processing
Claim
1. A method (500) in a second wireless communication transceiver (12) of providing precoder selection feedback (44) to a first wireless communication transceiver (10), as precoding information for said first transceiver (10), wherein said method includes determining (502) channel conditions at the second transceiver (12) and is characterized by:', 'when operating in a first feedback mode, selecting a precoder (28) from a predetermined set (50) of precoders (28) based on said channel conditions, sending a full-range index value (52), with the ability to indicate any of the precoders in the predetermined set, for the selected precoder to said first transceiver (10) as said precoder selection feedback (44);', 'when operating in a second feedback mode, selecting a precoder (28) from a smaller, predetermined subset (54) of precoders (28) contained within the predetermined set (50) of precoders (28) based on said channel conditions, and sending a smaller-range index value (56), with the ability to only indicate precoders within the predetermined subset of precoders, for the selected precoder to said first transceiver (10) as said precoder selection feedback (44); and using a smaller signaling payload for sending smaller-range index values (56) as compared to the signaling payload used to send full-range index values (54).
2. The method (500) of claim 1 , wherein the second transceiver (12) sends the precoder selection feedback (44) at certain first times on a control channel and at certain second times the transceiver (12) on a data channel, and wherein the method is further characterized by selecting said first feedback mode when sending the precoder selection feedback (44) multiplexed together with data on the same physical channel and selecting said second feedback mode when sending the precoder selection feedback (44) on the control channel.
3. The method (500) of claim 2, further characterized in that the first and second', 'transceivers (10, 12) operate in accordance with Long Term Evolution, LTE, air interface standards, and wherein said control channel comprises the LTE Physical Uplink Control Channel, PUCCH, and said data channel comprises the LTE Physical Uplink Shared Channel, PUSCH.
4. The method (500) of any of claims 1-3, further characterized in that using the smaller signaling payload to send the smaller-range index values (56) as compared to the signaling payload used to send the full-range index values (52) comprises using a smaller number of bits to represent the smaller-range index values as compared to the number of bits used to represent the full-range index values.
5. The method (500) of claim 1 or 2, further characterized by dynamically selecting either the first or the second feedback modes responsive to receiving control signaling (48) from the first transceiver (10).
6. The method (500) of any of claims 1-5, wherein the predetermined set (50) of precoders (28) comprises a predetermined set of DFT-based precoders providing a first spatial resolution for beam forming at the first transceiver ( 0), and wherein the predetermined subset (54) of precoders (28) contained within the predetermined set (50) comprises a subset of the same DFT-based precoders providing a second spatial resolution for said beam forming at the first transceiver (10), said second spatial resolution being lower than said first spatial resolution.
7. The method (500) of any of claims 1-6, further characterized in that the predetermined set (50) of precoders (28) includes a number of DFT-based precoders representing a total of N DFT-based beams for transmission beamforming, and wherein the predetermined subset (54) of precoders (28) represents a total of M DFT-based beams for transmission beamforming and corresponds to every R-th one of said N DFT-based beams, where N, M, and R are integer values and M < N.
8. The method of claim 7, further characterized in that at least some of the precoders (28) in the predetermined set (50) of precoders are based on a factorized precoder design comprising a conversion precoder and a tuning precoder, such that said at least some of the precoders (28) in the predetermined set (50) of precoders (28) correspond to a set of N different conversion precoders and a set of tuning precoders, and wherein each said conversion precoder comprises a block diagonal matrix in which each block comprises a DFT-based precoder that defines N different DFT-based beams for a subgroup in a group of NT transmit antenna ports at the first transceiver (10), and the predetermined subset of precoders represents every R-\ one of said N DFT-based beams.
9. The method (500) of any of claims 1-4 and 6-8, further characterized by selecting said second feedback mode when sending precoder selection feedback (44) as an unscheduled transmission, and selecting said first feedback mode when sending precoder selection feedback (44) as a scheduled transmission
10. A wireless communication transceiver (12) configured to provide precoder selection feedback (44) to another wireless communication transceiver (10) as precoding information for said other transceiver (10), said transceiver (12) comprising a receiver (32) configured to receive signals (46, 48) from said other transceiver (10) and a channel estimator (38) configured to estimate channel conditions at said transceiver (12) with respect to signals received from said other transceiver (10), and wherein said transceiver (12) is characterized by:', 'a transmitter (32) configured to transmit signals to said other transceiver (10), including signals conveying said precoder selection feedback (44); and', 'a precoding feedback generator (42) configured to determine whether to operate in a first feedback mode or a second feedback mode and further configured to:', 'when operating in the first feedback mode, select a precoder (28) from a predetermined set (50) of precoders (28) based on said channel conditions and send a full-range index value (52), with the ability to indicate any of the precoders in the predetermined set, for the selected precoder to said other transceiver (10) as said precoder selection feedback (44); and', 'when operating in the second feedback mode, select a precoder (28) from a', 'predetermined subset (54) of precoders (28) contained in said predetermined set (50) of precoders (28) based on said channel conditions and send a smaller-range index value (56), with the ability to only indicate precoders within the predetermined subset of precoders, for the selected precoder to said other transceiver (10) as said precoder selection feedback (44);', 'wherein said precoding feedback generator (42) is configured to use a smaller signaling payload for sending smaller-range index values (56) as compared to the signaling payload used to send full-range index values (54)
11. The transceiver (12) of claim 10, further characterized in that the transceiver (12) is configured to send precoder selection feedback (44) at certain first times on a control channel and at certain second times on a data channel, and wherein the precoding feedback generator (42) is configured to select said first feedback mode when sending the precoder selection feedback (44) multiplexed together with data on the same physical channel and to select said second feedback mode when sending the precoder selection feedback (44) on the control channel
12. The transceiver (12) of claim 11 , further characterized in that the transceiver (12) and said other transceiver (10) are configured to operate in accordance with Long Term Evolution, LTE, air interface standards, and wherein said control channel comprises the LTE Physical Uplink Control Channel, PUCCH, and said data channel comprises the LTE Physical Uplink Shared Channel, PUSCH
13. The transceiver (12) of claims 10-12, further characterized in that the transceiver (12) is configured to use the smaller signaling payload for sending the smaller-range index values (56) as compared to sending the full-range index values (52) based on being configured to use a smaller number of bits to represent the smaller-range index values (56) as compared to the number of bits used to represent the full-range index values (52).14. The transceiver (12) of claim 10 or 11, further characterized in that said transceiver (12) is configured to dynamically select either the first or the second feedback mode in response to receiving control signaling (48) from said other transceiver (10).15. The transceiver (12) of any of claims 10-14, further characterized in that the', 'predetermined set (50) of precoders (28) comprises a predetermined set of DFT-based precoders providing a first spatial resolution for beam forming at said other transceiver (10), and wherein the predetermined subset (54) of precoders (28) contained within the predetermined set (50) comprises a subset of the same DFT-based precoders providing a second spatial resolution for said beam forming at said other transceiver (10), said second spatial resolution being lower than said first spatial resolution.16. The transceiver (12) of any of claims 10-15, further characterized in that the', 'predetermined set (50) of precoders (28) includes a number of DFT-based precoders representing a total of N DFT-based beams for transmission beamforming, and wherein the predetermined subset (54) of precoders (28) represents a total of M DFT-based beams for transmission beamforming and corresponds to every R-th one of said N DFT-based beams, where N, M, and R are integer values and M < N.17. The transceiver (12) of claim 16, further characterized in that at least some of the precoders (28) in the predetermined set (50) of precoders are based on a factorized precoder design comprising a conversion precoder and a tuning precoder, such that said at least some of the precoders (28) in the predetermined set (50) of precoders (28) correspond to a set of N different conversion precoders and a set of tuning precoders, and wherein each said conversion precoder comprises a block diagonal matrix in which each block comprises a DFT-based precoder that defines N different DFT-based beams for a subgroup in a group of NT transmit antenna ports at the first transceiver (10), and the predetermined subset of precoders represents every R-t one of said N DFT-based beams.18. The transceiver (12) of any of claims 10-13 and 15-17, further characterized in that said transceiver (12) is configured to select said second feedback mode when sending precoder selection feedback (44) as an unscheduled transmission, and to select said first feedback mode when sending precoder selection feedback (44) as a scheduled transmission.19. A method (600) at a first wireless communication transceiver (10) of determining a precoder recommendation from a second wireless communication transceiver (12), said method characterized by:', 'receiving (602) precoder selection feedback (44) from the second transceiver (12); determining (604) whether the precoder selection feedback (44) comprises a first type of precoder selection feedback including a full-range index value (52), or a second type of precoder selection feedback including a smaller-range index value (56) that is signaled by the second transceiver (12) using a lower signaling overhead as compared to that used for signaling full-range index values;', 'if the precoder selection feedback (44) is the first type of precoder selection feedback, identifying (606) the precoder recommendation by identifying a precoder (28) from a', 'predetermined set (50) of precoders (28) indexed by the full-range index value (52) included in the precoder selection feedback (44);', 'if the precoder selection feedback (44) is the second type of precoder selection feedback, identifying (608) the precoder recommendation by identifying a precoder (28) from a predetermined subset (54) of precoders (28) indexed by the smaller-range index value (56) included in the precoder selection feedback (44), said predetermined subset (54) of precoders (28) contained within the predetermined set (50) of precoders (28); and', 'determining (610) a precoding operation for precoding a transmission (46) to the second transceiver (12) based at least in part on the precoder recommendation.
20. The method (600) of claim 19, further characterized by receiving said first type of precoder selection feedback on a data channel and receiving said second type of precoder selection feedback on a control channel.
21. The method (600) of claim 20, further characterized in that the first and second transceivers (10, 12) operate in accordance with Long Term Evolution, LTE, air interface standards, and wherein said control channel comprises the LTE Physical Uplink Control Channel, PUCCH, and said data channel comprises the LTE Physical Uplink Shared Channel, PUSCH.
22. The method (600) of claim 19, further characterized by sending control signaling (48) to the second transceiver (12) to control whether the second transceiver (12) sends the first type or the second type of precoder selection feedback (44).
23. The method (600) of any of claims 19-22, further characterized in that the predetermined set (50) of precoders (28) comprises a predetermined set of DFT-based precoders providing a first spatial resolution for beam forming at said first transceiver (10), and wherein the predetermined subset (54) of precoders (28) contained within the predetermined set (50) comprises a subset of the same DFT-based precoders providing a second spatial resolution for said beam forming at said first transceiver (10), said second spatial resolution being lower than said first spatial resolution.
24. The method (600) of any of claims 19-23, further characterized in that the predetermined set (50) of precoders (28) represents a total of N DFT-based beams for transmission beamforming by said transceiver (10), and wherein the predetermined subset 54 of precoders (28) represents a total of M DFT-based beams for transmission beamforming and corresponds to every R-th one of said N DFT-based beams, where N, M, and R are integer values and M < N.
25. The method (600) of claim 24, further characterized in that said M precoders are selected from the N precoders to minimize distances on a Grassmanian manifold between the M precoders.
26. A wireless communication transceiver (10) configured to determine a precoder recommendation from another wireless communication transceiver (12), said transceiver (10) characterized by:', 'a receiver (16) configured to receive precoder selection feedback (44) from the other transceiver (12);', 'a feedback processor (22) configured to determine whether the precoder selection feedback (44) comprises a first type of precoder selection feedback including a full-range index value (52), or a second type of precoder selection feedback including a smaller-range index value (56) that is signaled by the other transceiver (12) using a lower signaling overhead as compared to that used for signaling full-range index values;', 'said feedback processor (22) configured to:', 'if the precoder selection feedback (44) is the first type of precoder selection feedback, identify the precoder recommendation by identifying a precoder (28) from a predetermined set (50) of precoders (28) indexed by the full-range index value (52) included in the precoder selection feedback (44); and', 'if the precoder selection feedback (44) is the second type of precoder selection feedback, identify the precoder recommendation by identifying a precoder (28) from a predetermined subset (54) of precoders (28) indexed by the smaller-range index value (56) included in the precoder selection feedback (44), said predetermined subset (54) of precoders (28) contained within the predetermined set (50) of precoders (28); and wherein said feedback processor (22) or an associated precoding controller (20) is configured to determine a precoding operation for precoding a transmission (46) to the other transceiver (12) based at least in part on the precoder recommendation.
27. The transceiver (10) of claim 26, further characterized in that said transceiver (10) is configured to receive the first type of precoder selection feedback over a data channel between the transceivers (10, 12), and is configured to receive the second type of precoder selection feedback over a control channel between the transceivers (10, 12).
28. The transceiver (10) of claim 27, further characterized in that said transceiver (10) is an eNodeB configured for operation a wireless communication network based on 3GPP Long Term Evolution (LTE) standards, and wherein the data channel comprises the LTE Physical Uplink Shared Channel, PUSCH, and the control channel comprises the LTE Physical Uplink Control Channel (PUCCH).
29. The transceiver (10) of any of claims 26-28, further characterized in that the', 'predetermined set (50) of precoders (28) comprises a predetermined set of DFT -based precoders providing a first spatial resolution for beam forming at said transceiver (10), and wherein the predetermined subset (54) of precoders (28) contained within the predetermined set (50) comprises a subset of the same DFT-based precoders providing a second spatial resolution for said beam forming at said transceiver (10), said second spatial resolution being lower than said first spatial resolution.
30. The transceiver (10) of any of claims 26-29, further characterized in that the', 'predetermined set (50) of precoders (28) represents a total of N DFT-based beams for transmission beamforming by said transceiver (10), and wherein the predetermined subset 54 of precoders (28) represents a total of M DFT-based beams for transmission beamforming by said transceiver (10) and corresponds to every R-Vn one of said N DFT-based beams, where N, M, and R are integer values and M < N, and wherein said other transceiver (12) uses said smaller- range index values (56) to indicate precoder selections from among the M precoders (28) in the predetermined subset (54) and uses said full-range index values (52) to indicate precoder selections from among the N precoders (28) in the predetermined set (50).']
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ClaimChart-WO2011126445A1-STO
Patent number:WO2011126445A1
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