Granted Patent B2

US 12,256,436 · App. 17/441,181 · Granted Mar 18, 2025

Inventors: Yushu Zhang (Beijing, CN); Gang Xiong (Portland, OR); Hong He (Sunnyvale, CA); Sergey Sosnin (Zavolzhie, RU)

Assignee: Apple Inc.

H04W74/0833H04W52/16H04W52/362H04W72/1268

Abstract

Claims (44)

1. A method of operating a user equipment (UE) in a wireless network, the method comprising:

determining a first transmission power of a physical random access channel (PRACH) preamble to be used during a 2-step random access channel (RACH) procedure;

determining a second transmission power of a physical uplink shared channel (PUSCH) transmission to be used during the 2-step RACH procedure, wherein the second transmission power of the PUSCH transmission is based on the first transmission power of the PRACH preamble;

performing the 2-step RACH procedure based on the first transmission power of the PRACH preamble and the second transmission power of the PUSCH transmission, to establish a connection to the wireless network;

switching to a 4-step RACH procedure from the 2-step RACH procedure based on a determination that the PRACH preamble was successfully detected and the PUSCH transmission was falsely detected; and

performing the 4-step RACH procedure based on the first transmission power of the PRACH preamble.

2. The method of claim 1 , wherein the performing the 2-step RACH procedure comprises transmitting, to a base station (BS), a MsgA including the PRACH preamble and the PUSCH transmission, wherein the PRACH preamble is set to the first transmission power and the PUSCH transmission is set to the second transmission power.

3. The method of claim 2 , further comprising re-transmitting the MsgA, the re-transmitting comprising:

first power ramping of the first transmission power of the PRACH preamble; and

second power ramping of the second transmission power of the PUSCH transmission,

wherein the second power ramping has a different power step size than the first power ramping.

4. The method of claim 1 , wherein the first transmission power of the PRACH preamble is predefined based on a Third Generation Partnership (3GPP) standard.

5. The method of claim 1 , wherein the determining the second transmission power of the PUSCH transmission comprises applying a power offset to the first transmission power of the PRACH preamble to determine the second transmission power of the PUSCH transmission.

6. The method of claim 5 , wherein the power offset is based on relative bandwidths allocated for the PRACH preamble and the PUSCH transmission.

7. The method of claim 5 , wherein the power offset is determined by higher layer signaling received from a base station (BS).

8. A user equipment (UE), comprising:

radio front end circuitry configured to perform wireless communication over a wireless network; and

processor circuitry, coupled to the radio front end circuitry, configured to:

determine a transmission power of a physical uplink shared channel (PUSCH) transmission based on a transmission power of a physical random access channel (PRACH) preamble that is associated with the PUSCH transmission during a 2-step random access channel (RACH) procedure;

perform, using the radio front end circuitry, the 2-step RACH procedure based on the transmission power of the PRACH preamble and the determined transmission power of the PUSCH transmission to establish a connection to the wireless network;

switch to a 4-step RACH procedure from the 2-step RACH procedure based on a determination that the PRACH preamble was successfully detected and the PUSCH transmission was falsely detected; and

perform the 4-step RACH procedure based on the transmission power of the PRACH preamble.

9. The UE of claim 8 , wherein to perform the 2-step RACH procedure, the processor circuitry is further configured to:

transmit, to a base station (BS), a MsgA including the PUSCH transmission having the determined transmission power and the associated PRACH preamble, wherein the transmission power of the PRACH preamble is predefined based on a Third Generation Partnership (3GPP) standard.

10. The UE of claim 9 , wherein to re-transmit the MsgA, the processor circuitry is further configured to:

ramp the transmission power of the PRACH preamble according to a first power step size; and

ramp the transmission power of the PUSCH transmission according to a second power step size that is different from the first power step size.

11. The UE of claim 8 , wherein the processor circuitry is further configured to determine the transmission power of the PUSCH transmission by applying a power offset to the transmission power of the PRACH preamble.

12. The UE of claim 11 , wherein the power offset is based on relative bandwidths allocated for the PRACH preamble and the PUSCH transmission.

13. The UE of claim 11 , wherein the power offset is determined by higher layer signaling received from a base station (BS).

14. A non-transitory computer readable medium having instructions stored thereon that, when executed by one or more processors of a user equipment (UE), cause the UE to perform operations, the operations comprising:

determining a first transmission power of a physical random access channel (PRACH) preamble to be used during a 2-step random access channel (RACH) procedure;

determining a second transmission power of a physical uplink shared channel (PUSCH) transmission to be used during the 2-step RACH procedure, wherein the second transmission power of the PUSCH transmission is based on the first transmission power of the PRACH preamble;

performing the 2-step RACH procedure, based on the first transmission power of the PRACH preamble and the second transmission power of the PUSCH transmission, to establish a connection to a wireless network;

switching to a 4-step RACH procedure from the 2-step RACH procedure based on a determination that the PRACH preamble was successfully detected and the PUSCH transmission was falsely detected; and

performing the 4-step RACH procedure based on the first transmission power of the PRACH preamble.

15. The non-transitory computer readable medium of claim 14 , wherein the performing the 2-step RACH procedure comprises transmitting, to a base station (BS), a MsgA including the PRACH preamble and the PUSCH transmission, wherein the PRACH preamble is set to the first transmission power and the PUSCH transmission is set to the second transmission power.

16. The non-transitory computer readable medium of claim 15 , the operations further comprising re-transmitting the MsgA, the re-transmitting comprising:

first power ramping of the first transmission power of the PRACH preamble; and

second power ramping of the second transmission power of the PUSCH transmission, wherein the second power ramping has a different power step size than the first power ramping.

17. The non-transitory computer readable medium of claim 14 , wherein the first transmission power of the PRACH preamble is predefined based on a Third Generation Partnership (3GPP) standard.

18. The non-transitory computer readable medium of claim 14 , wherein the determining the second transmission power of the PUSCH transmission comprises applying a power offset to the first transmission power of the PRACH preamble to determine the second transmission power of the PUSCH transmission.

19. The non-transitory computer readable medium of claim 18 , wherein the power offset is based on relative bandwidths allocated for the PRACH preamble and the PUSCH transmission.

20. The non-transitory computer readable medium of claim 18 , wherein the power offset is determined by higher layer signaling received from a base station (BS).

Continuity (2)

References Cited (21)

Cited By (2)

US 12,389,340 US 12,507,285