阅读说明：本技术 随机接入规程期间的上行链路发射功率控制 (Uplink transmit power control during random access procedure ) 是由 M·N·*** S·萨布拉马尼安 B·萨迪格 N·阿贝迪尼 于 2018-06-22 设计创作，主要内容包括：在调整上行链路发射功率时,可使用发射波束成形增益和接收波束成形增益。例如,用户装备(UE)可在具有与针对上行链路发射波束的波束成形增益不同的波束成形增益的接收波束上接收来自基站的下行链路通信。该UE可基于这些波束成形增益的差异来调整(例如,用于传送随机接入信道(RACH)的)上行链路发射功率。例如,在确定用于RACH传输的经调整上行链路发射功率时,除最大允许发射功率、目标前置码收到功率和估计路径损耗外,还可使用表示这些波束成形增益的差异的参数。该调整可导致更高或更低的发射功率,这取决于接收波束成形增益和发射波束成形增益的差异。(In adjusting the uplink transmit power, transmit beamforming gain and receive beamforming gain may be used. For example, a User Equipment (UE) may receive downlink communications from a base station on a receive beam having a beamforming gain different from a beamforming gain for an uplink transmit beam. The UE may adjust uplink transmit power (e.g., for transmitting a Random Access Channel (RACH)) based on the differences in the beamforming gains. For example, in determining the adjusted uplink transmit power for RACH transmission, parameters representing differences in these beamforming gains may be used in addition to the maximum allowed transmit power, the target preamble received power, and the estimated path loss. This adjustment may result in higher or lower transmit power depending on the difference in receive and transmit beamforming gains.)

1. A method for wireless communication at a User Equipment (UE), comprising:

determining a transmit beamforming gain for a transmit beam of the UE;

determining a receive beamforming gain for a receive beam of the UE;

determining a transmit power for an uplink random access transmission based at least in part on the determined transmit beamforming gain and the determined receive beamforming gain; and

transmitting the uplink random access transmission using the determined transmit power.

2. The method of claim 1, wherein determining the transmit power comprises:

determining a beamforming gain difference between the transmit beamforming gain and the receive beamforming gain; and

determining the transmit power based at least in part on the determined beamforming gain difference.

3. The method of claim 2, wherein the beamforming gain difference comprises a difference between a minimum beamforming gain for the transmit beam and a maximum beamforming gain for the receive beam.

4. The method of claim 2, wherein the beamforming gain difference comprises a difference between a minimum cross point beamforming gain for a set of transmit beams including the transmit beam and a maximum beamforming gain for a set of receive beams including the receive beam.

5. The method of claim 4, wherein the set of transmit beams comprises all transmit beams of the UE, and wherein the set of receive beams comprises all receive beams of the UE.

6. The method of claim 2, wherein the beamforming gain difference comprises a difference between a fixed beamforming gain for the transmit beam and a fixed beamforming gain for the receive beam.

7. The method of claim 6, further comprising:

receiving, from a base station, an indication of the fixed beamforming gain for the transmit beam, or the fixed beamforming gain for the receive beam, or a combination thereof, wherein the indication is received in a Master Information Block (MIB), or Remaining Minimum System Information (RMSI), or Other System Information (OSI), or a System Information Block (SIB), or Radio Resource Control (RRC) signaling, or a handover command, or a Medium Access Control (MAC) Control Element (CE), or Downlink Control Information (DCI), or a combination thereof.

8. The method of claim 2, wherein the beamforming gain difference comprises a difference between a maximum beamforming gain for the transmit beam and a fixed beamforming gain for the receive beam.

9. The method of claim 8, further comprising:

receiving, from a base station, an indication of the fixed beamforming gain for the receive beam, wherein the indication is received in a Master Information Block (MIB), or Remaining Minimum System Information (RMSI), or Other System Information (OSI), or a System Information Block (SIB), or Radio Resource Control (RRC) signaling, or a handover command, or a Medium Access Control (MAC) Control Element (CE), or Downlink Control Information (DCI), or a combination thereof.

10. The method of claim 2, wherein the beamforming gain difference comprises a difference between a fixed beamforming gain for the transmit beam and a maximum beamforming gain for the receive beam.

11. The method of claim 10, further comprising:

receiving, from a base station, an indication of the fixed beamforming gain for the transmit beam, wherein the indication is received in a Master Information Block (MIB), or Remaining Minimum System Information (RMSI), or Other System Information (OSI), or a System Information Block (SIB), or Radio Resource Control (RRC) signaling, or a handover command, or a Medium Access Control (MAC) Control Element (CE), or Downlink Control Information (DCI), or a combination thereof.

12. The method of claim 2, further comprising:

determining the transmit power further based at least in part on a target preamble received power, an estimated path loss, and a maximum transmit power of the UE.

13. The method of claim 12, wherein determining the transmit power further comprises:

adding the determined beamforming gain difference to a sum of the target preamble received power and the estimated path loss.

14. The method of claim 12, wherein determining the transmit power further comprises:

subtracting the determined beamforming gain difference from a sum of the target preamble received power and the estimated path loss.

15. The method of claim 1, wherein the transmit beamforming gain comprises a transmit array gain, or a first antenna element gain, or a combination thereof, and wherein the receive beamforming gain comprises a receive array gain, or a second antenna element gain, or a combination thereof.

16. The method of claim 15, wherein the transmit beamforming gain comprises a summation of the transmit array gain and the first antenna element gain, and wherein the receive beamforming gain comprises a summation of the receive array gain and the second antenna element gain.

17. The method of claim 1, further comprising:

determining a beam correspondence status indicating a correspondence between one or more uplink transmit beams including the transmit beam and one or more downlink receive beams including the receive beam, wherein adjusting the transmit power is based on the determined beam correspondence status.

18. The method of claim 17, further comprising:

identifying one of a plurality of adjustment procedures to be used to adjust the transmit power for the uplink random access transmission based at least in part on the determined transmit beamforming gain and the determined receive beamforming gain; and

adjusting the transmit power based on the identified adjustment procedure.

19. The method of claim 17, further comprising:

receiving an instruction from a base station to adjust the transmit power based at least in part on the determined beam correspondence state, wherein the instruction is received in a Master Information Block (MIB), or Remaining Minimum System Information (RMSI), or Other System Information (OSI), or a System Information Block (SIB), or Radio Resource Control (RRC) signaling, or a handover command, or a Medium Access Control (MAC) Control Element (CE), or Downlink Control Information (DCI), or a combination thereof.

20. The method of claim 17, wherein receiving an indication of a power offset from a base station, wherein determining the transmit power for the uplink random access transmission comprises:

applying the power offset based at least in part on the determined beam correspondence state.

21. The method of claim 1, wherein the uplink random access transmission comprises a message transmitted on a Physical Random Access Channel (PRACH) during a random access procedure.

22. A method for wireless communications at a base station, comprising:

identifying a User Equipment (UE) having a transmit beam and a receive beam; and

transmit, to the UE, instructions for the UE to adjust a transmit power for an uplink random access transmission of the UE based at least in part on a transmit beamforming gain of the transmit beam for the UE and a receive beamforming gain of the receive beam for the UE, or a beam correspondence state at the UE, or a combination thereof.

23. The method of claim 22, further comprising:

identifying an estimated interference level, wherein the instruction is selected based at least in part on the estimated interference level.

24. The method of claim 22, further comprising:

transmitting a power value for a beamforming gain to the UE.

25. The method of claim 24, wherein the UE applies a power offset value to the transmit power for the uplink random access transmission based at least in part on the beam correspondence state at the UE.

26. The method of claim 24, wherein the power value indicates a power offset for the UE to use to estimate a difference between the transmit beamforming gain and the receive beamforming gain, the UE using the estimated difference to adjust the transmit power for the uplink random access transmission.

27. The method of claim 22, further comprising:

identifying an interference level associated with communication with the UE;

determining that the identified interference level is above or below a predetermined threshold;

identifying a power offset based at least in part on the determination; and

transmitting the instruction based at least in part on the identified interference level, wherein the instruction comprises an indication for the UE to add or subtract the power offset when calculating the transmit power.

28. The method of claim 22, wherein transmitting the instruction to the UE comprises:

the instructions are transmitted in a Master Information Block (MIB), or Remaining Minimum System Information (RMSI), or Other System Information (OSI), or System Information Block (SIB), or Radio Resource Control (RRC) signaling, or a handover command, or a Medium Access Control (MAC) Control Element (CE), or Downlink Control Information (DCI), or a combination thereof.

29. An apparatus for wireless communication, comprising:

means for determining a transmit beamforming gain for a transmit beam of the device;

means for determining a receive beamforming gain for a receive beam of the device;

means for determining a transmit power for an uplink random access transmission based at least in part on the determined transmit beamforming gain and the determined receive beamforming gain; and

means for transmitting the uplink random access transmission using the determined transmit power.

30. An apparatus for wireless communication, comprising:

means for identifying a User Equipment (UE) having a transmit beam and a receive beam; and

means for transmitting, to the UE, instructions for the UE to adjust a transmit power for an uplink random access transmission of the UE based at least in part on a transmit beamforming gain for the transmit beam of the UE and a receive beamforming gain for the receive beam of the UE, or a beam correspondence state at the UE, or a combination thereof.