Method and apparatus for multi-transmission/reception point power headroom reporting in a wireless communication system
地域：
Taipei
摘要
A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives an uplink (UL) grant. The UL grant is indicative of a first Physical Uplink Shared Channel (PUSCH) transmission on a first Transmission/Reception Point (TRP) of a first cell. The UL grant is not indicative of a PUSCH transmission on a second TRP of the first cell. The UE transmits a Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element (CE). Based on the UL grant, the PHR MAC CE is indicative of a first power headroom (PH), associated with the first TRP, based on a real PUSCH transmission, and is indicative of a second PH, associated with the second TRP, based on a reference PUSCH transmission.
說明書
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The present Application claims the benefit of U.S. Provisional Patent Application Ser. No. 63/130,551 filed on Dec. 24, 2020, the entire disclosure of which is incorporated herein in its entirety by reference. The present Application also claims the benefit of U.S. Provisional Patent Application Ser. No. 63/131,142 filed on Dec. 28, 2020, the entire disclosure of which is incorporated herein in its entirety by reference.
This disclosure generally relates to wireless communication networks, and more particularly, to a method and apparatus for multi-Transmission/Reception Point (TRP) power headroom reporting in a wireless communication system.
With the rapid rise in demand for communication of large amounts of data to and from mobile communication devices, traditional mobile voice communication networks are evolving into networks that communicate with Internet Protocol (IP) data packets. Such IP data packet communication can provide users of mobile communication devices with voice over IP, multimedia, multicast and on-demand communication services.
An exemplary network structure is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The E-UTRAN system can provide high data throughput in order to realize the above-noted voice over IP and multimedia services. A new radio technology for the next generation (e.g., 5G) is currently being discussed by the 3GPP standards organization. Accordingly, changes to the current body of 3GPP standard are currently being submitted and considered to evolve and finalize the 3GPP standard.
權(quán)利要求
The invention claimed is:1. A method of a User Equipment (UE), the method comprising:receiving a configuration, by the UE and from a network, indicating whether to report two power headrooms (PHs) for a first cell; receiving, by the UE, an uplink (UL) grant, wherein:the UL grant is indicative of a first Physical Uplink Shared Channel (PUSCH) transmission on a first Transmission/Reception Point (TRP) of the first cell; and the UL grant is not indicative of a second PUSCH transmission on a second TRP of the first cell; determining, by the UE and based on the configuration received by the UE and from the network, to indicate a first Type 1 PH and a second Type 1 PH for the first cell in a single Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element (CE) for both the first TRP and the second TRP; and transmitting, by the UE, the single PHR MAC CE, for both the first TRP and the second TRP and having Type 1 PHs for both the first TRP and the second TRP, in a second slot, wherein in response to the determination to indicate the first Type 1 PH and the second Type 1 PH for the first cell, the single PHR MAC CE is generated to indicate:the first Type 1 PH, wherein the first Type 1 PH is for the first TRP of the first cell and is computed based on the first PUSCH transmission indicated by the UL grant when the first PUSCH transmission is performed in a first slot that overlaps with the second slot; and the second Type 1 PH, wherein the second Type 1 PH is for the second TRP of the first cell and is computed based on a reference PUSCH transmission of the UE when the UL grant is not indicative of the second PUSCH transmission on the second TRP of the first cell. 2. The method of claim 1 , wherein the single PHR MAC CE is indicative of:a first UE maximum transmit power for the first TRP and a second UE maximum transmit power for the second TRP; or a single UE maximum transmit power for both the first TRP and the second TRP. 3. The method of claim 1 , wherein:the UE is configured with a first PUSCH power control adjustment state for the first TRP and a second PUSCH power control adjustment state for the second TRP; and the first PUSCH power control adjustment state for the first TRP is different from the second PUSCH power control adjustment state for the second TRP. 4. The method of claim 1 , wherein:there is no transmission, associated with the second TRP, that overlaps in time domain with the second slot for transmitting the single PHR MAC CE. 5. The method of claim 1 , wherein:transmitting the single PHR MAC CE comprises transmitting the single PHR MAC CE for both the first TRP and the second TRP to the first cell or to a second cell. 6. The method of claim 1 , wherein:triggering a PHR, associated with the single PHR MAC CE, after receiving the UL grant. 7. The method of claim 1 , comprising:determining a difference between a reference UE maximum transmit power and a power for the reference PUSCH transmission; and determining, based on the difference, the second Type 1 PH indicated in the single PHR MAC CE for the second TRP of the first cell. 8. The method of claim 1 , comprising:determining the first Type 1 PH based on a difference between a UE maximum transmit power and an estimated power for the first PUSCH transmission. 9. The method of claim 1 , wherein:the first TRP, for which the first Type 1 PH is determined to be indicated in the single PHR MAC CE, is associated with a first Sounding Reference Signal (SRS) resource set of the first cell; and the second TRP, for which the second Type 1 PH is determined to be indicated in the single PHR MAC CE, is associated with a second SRS resource set of the first cell. 10. A User Equipment (UE), comprising:a control circuit; a processor installed in the control circuit; and a memory installed in the control circuit and operatively coupled to the processor, wherein the processor is configured to execute a program code stored in the memory to perform operations, the operations comprising:receiving a configuration, by the UE and from a network, indicating whether to report two power headrooms (PHs) for a first cell; receiving an uplink (UL) grant, wherein:the UL grant is indicative of a first Physical Uplink Shared Channel (PUSCH) transmission on a first Transmission/Reception Point (TRP) of the first cell; and the UL grant is not indicative of a second PUSCH transmission on a second TRP of the first cell; determining, based on the configuration received by the UE and from the network, to indicate a first Type 1 PH and a second Type 1 PH for the first cell in a single Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element (CE) for both the first TRP and the second TRP; and transmitting the single PHR MAC CE, for both the first TRP and the second TRP and having Type 1 PHs for both the first TRP and the second TRP, in a second slot, wherein in response to the determination to indicate the first Type 1 PH and the second Type 1 PH for the first cell, the single PHR MAC CE is generated to indicate:the first Type 1 PH, wherein the first Type 1 PH is for the first TRP of the first cell and is computed based on the first PUSCH transmission indicated by the UL grant when the first PUSCH transmission is performed in a first slot that overlaps with the second slot, wherein the first Type 1 PH is based on a real PUSCH transmission; and the second Type 1 PH, wherein the second Type 1 PH is for the second TRP of the first cell and is computed based on a reference PUSCH transmission of the UE when the UL grant is not indicative of the second PUSCH transmission on the second TRP of the first cell. 11. The UE of claim 10 , wherein the single PHR MAC CE is indicative of:a first UE maximum transmit power for the first TRP and a second UE maximum transmit power for the second TRP; or a single UE maximum transmit power for both the first TRP and the second TRP. 12. The UE of claim 10 , wherein:the UE is configured with a first PUSCH power control adjustment state for the first TRP and a second PUSCH power control adjustment state for the second TRP; and the first PUSCH power control adjustment state is different from the second PUSCH power control adjustment state. 13. The UE of claim 10 , wherein:there is no transmission, associated with the second TRP, that overlaps in time domain with the second slot for transmitting the single PHR MAC CE. 14. The UE of claim 10 , wherein:transmitting the single PHR MAC CE comprises transmitting the single PHR MAC CE to the first cell or to a second cell. 15. The UE of claim 10 , wherein:the first TRP is associated with a first Sounding Reference Signal (SRS) resource set of the first cell; and the second TRP is associated with a second SRS resource set of the first cell. 16. The UE of claim 10 , wherein:triggering a PHR, associated with the single PHR MAC CE, after receiving the UL grant. 17. A non-transitory computer-readable medium comprising processor-executable instructions that when executed by a User Equipment (UE) cause performance of operations, the operations comprising:receiving a configuration, by the UE and from a network, indicating whether to report two power headrooms (PHs) for a first cell; receiving, by the UE, an uplink (UL) grant, wherein:the UL grant is indicative of a first Physical Uplink Shared Channel (PUSCH) transmission on a first Transmission/Reception Point (TRP) of the first cell; and the UL grant is not indicative of a second PUSCH transmission on a second TRP of the first cell; determining, by the UE and based on the configuration received by the UE and from the network, to indicate a first Type 1 PH and a second Type 1 PH for the first cell in a single Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element (CE) for both the first TRP and the second TRP; and transmitting, by the UE, the single PHR MAC CE, for both the first TRP and the second TRP and having Type 1 PHs for both the first TRP and the second TRP, in a second slot, wherein in response to the determination to indicate the first Type 1 PH and the second Type 1 PH for the first cell, the single PHR MAC CE is generated to indicate:the first Type 1 PH, wherein the first Type 1 PH is for the first TRP of the first cell and is computed based on the first PUSCH transmission indicated by the UL grant when the first PUSCH transmission is performed in a first slot that overlaps with the second slot; and the second Type 1 PH, wherein the second Type 1 PH is for the second TRP of the first cell and is computed based on a reference PUSCH transmission of the UE when the UL grant is not indicative of the second PUSCH transmission on the second TRP of the first cell.
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