System and method for supporting beamformed sounding reference signals
地域：
TX
TX Plano
摘要
A method for operating a user equipment (UE) includes receiving, by the UE from a transmit-receive point (TRP), a sounding reference signal (SRS) configuration for a SRS resource, determining, by the UE, at least one transmit beam for transmitting a SRS, wherein the at least one transmit beam is determined in accordance with TRP receive beam information and the SRS configuration, and transmitting, by the UE, the SRS on the SRS resource using the at least one transmit beam in accordance with the SRS configuration.
說明書
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This application claims the benefit of U.S. Provisional Application No. 62/532,177, filed on Jul. 13, 2017, entitled “System and Method for Supporting Beamformed Sounding Reference Signals,” which application is hereby incorporated herein by reference in its entirety.
The present disclosure relates generally to a system and method for digital communications, and, in particular embodiments, to a system and method for supporting beamformed sounding reference signals.
Future wireless communications systems are operating at ever higher carrier frequencies in a quest to find greater bandwidth and less interference. These wireless communications systems may operate at frequencies of 6 GHz and above. In order to fully utilize the greater bandwidth available in the wireless communications systems, transmission-reception points (TRPs) may require more bandwidth and less latency than what is afforded in existing backhaul or fronthaul connections. Furthermore the density of the TRPs is likely to be much higher than current deployments and the cost of laying wireline high capacity backhaul connections to all of these TRPs can be prohibitive. Additionally, in certain situations some TRPs may be temporal in nature or mobile and may not be able to support a wireline connection.
Reference signals are commonly used to assist communications devices to make measurements. As an example, channel state information reference signals (CSI-RSs) are transmitted by TRPs to allow user equipments (UEs) to measure downlink channels, while sounding reference signals (SRSs) are transmitted by UEs to allow TRPs to measure uplink channels.
權(quán)利要求
What is claimed is:1. A computer implemented method for operating a user equipment (UE), the method comprising:receiving, by the UE from a transmit-receive point (TRP), a sounding reference signal (SRS) configuration for a SRS resource, the SRS configuration indicating a specific TRP beam listened to for reception of a SRS by the TRP; determining, by the UE, a specific UE beam for transmitting a SRS by the UE based on the specific TRP beam listened to for reception of a SRS by the TRP; and transmitting, by the UE, the SRS on the SRS resource using the specific UE beam determined by the UE. 2. The method of claim 1 , wherein the specific UE beam is further determined in accordance with downlink channel measurements made by the UE. 3. The method of claim 1 , further comprising:determining, by the UE, the specific UE beam further in accordance with previously-received TRP receive beam information. 4. The method of claim 1 , further comprising:determining, by the UE, the specific UE beam further in accordance with a continuation indicator and previously-received TRP receive beam information. 5. The method of claim 1 , further comprising:determining, by the UE, the specific UE beam further in accordance with a persistence indicator and previously-received TRP receive beam information. 6. The method of claim 1 , wherein the SRS configuration includes at least two message types for each SRS resource. 7. The method of claim 6 , wherein a first message type conveys information about a receive beam at the TRP associated with a SRS resource. 8. The method of claim 7 , wherein a second message type conveys information about whether the receive beam has changed with respect to the first message type. 9. The method of claim 7 , wherein a second message type conveys information about a persistence window for the receive beam. 10. The method of claim 1 , wherein the SRS configuration includes an uplink reference signal resource indicator previously transmitted by the UE and received using a receive beam associated with the SRS resource as specified in the SRS configuration. 11. The method of claim 1 , wherein the SRS configuration includes a downlink reference signal resource indicator previously transmitted by the UE and received with spatial filtering associated with a receive beam associated with the SRS resource as specified in the SRS configuration. 12. The method of claim 1 , wherein the SRS configuration includes an uplink data signal resource indicator previously transmitted by the UE and received using a receive beam associated with the SRS resource as specified in the SRS configuration. 13. A user equipment (UE) comprising:a non-transitory memory storage comprising instructions; and one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to:receive, from a transmit-receive point (TRP), a sounding reference signal (SRS) configuration for a SRS resource, the SRS configuration indicating a specific TRP beam listened to for reception of a SRS by the TRP; determine a specific UE beam for transmitting a SRS, wherein the specific UE beam is based on the specific TRP beam listened to for reception of a SRS by the TRP; and transmit the SRS on the SRS resource using the specific UE beam determined by the UE. 14. The UE of claim 13 , wherein the one or more processors further execute the instructions to determine the specific UE beam in accordance with downlink channel measurements made by the UE. 15. The UE of claim 13 , wherein the one or more processors further execute the instructions to determine the specific UE beam further in accordance with previously-received TRP receive beam information. 16. The UE of claim 13 , wherein the one or more processors further execute the instructions to determine the specific UE beam further in accordance with a continuation indicator and previously-received TRP receive beam information. 17. The UE of claim 13 , wherein the one or more processors further execute the instructions to determine the specific UE beam further in accordance with a persistence indicator and previously-received TRP receive beam information. 18. The UE of claim 13 , wherein the SRS configuration includes an uplink reference signal resource indicator previously transmitted by the UE and received using a receive beam associated with the SRS resource as specified in the SRS configuration. 19. The UE of claim 13 , wherein the SRS configuration includes a downlink reference signal resource indicator previously transmitted by the UE and received with spatial filtering associated with a receive beam associated with the SRS resource as specified in the SRS configuration. 20. The UE of claim 13 , wherein the SRS configuration includes an uplink data signal resource indicator previously transmitted by the UE and received using a receive beam associated with the SRS resource as specified in the SRS configuration. 21. The UE of claim 13 , wherein the SRS configuration includes at least two message types for each SRS resource. 22. A non-transitory computer-readable medium storing computer instructions, that when executed by one or more processors, cause the one or more processors to perform steps to:receive, from a transmit-receive point (TRP), a sounding reference signal (SRS) configuration for a SRS resource, the SRS configuration indicating a specific TRP beam listened to for reception of a SRS by the TRP; determine a specific UE beam for transmitting a SRS, wherein the specific UE beam is based on the specific TRP beam listened to for reception of a SRS by the TRP; and transmit the SRS on the SRS resource using the specific UE beam determined by the UE. 23. The non-transitory computer-readable medium of claim 22 , wherein the one or more processors further execute the instructions to determine the specific UE beam in accordance with downlink channel measurements made by a user equipment (UE). 24. The non-transitory computer-readable medium of claim 22 , wherein the one or more processors further execute the instructions to determine the specific UE beam further in accordance with previously-received TRP receive beam information. 25. The non-transitory computer-readable medium of claim 22 , wherein the one or more processors further execute the instructions to determine the specific UE beam further in accordance with a continuation indicator and previously-received TRP receive beam information. 26. The non-transitory computer-readable medium of claim 22 , wherein the one or more processors further execute the instructions to determine the specific UE beam further in accordance with a persistence indicator and previously-received TRP receive beam information. 27. The non-transitory computer-readable medium of claim 22 , wherein the SRS configuration includes at least two message types for each SRS resource.
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