METHOD AND APPARATUS FOR MULTIPLE PREAMBLE RANDOM ACCESS POWER CONTROL

1 .- 11 . (canceled)

12 . A method for a user equipment (UE) performing random access in a wireless network, the method comprising:

sending, to the wireless network in a first random access procedure, multiple preambles over respective K 1 and K 2 time-frequency resources at a first transmission power range, wherein a last preamble sent over the K 2 time frequency resources is the last preamble sent in the first random access procedure;

determining a random access response (RAR) including uplink resources has not been successfully received from the wireless network in response to sending the multiple preambles;

updating a preamble power ramping counter; and

sending one or more additional random access preambles over determined time-frequency resources, at an increased second transmission power based on the preamble power ramping counter, until the RAR with the uplink resources is successfully received in a configured window of time or not.

13 . The method of claim 12 , wherein determining the RAR has not been received includes monitoring, in a random access response window, a physical downlink control channel (PDCCH) scrambled by a radio network temporary identifier (RA-RNTI).

14 . The method of claim 12 , wherein the respective K 1 and K 2 time-frequency resources comprise consecutive resources in a time domain that do not overlap.

15 . The method of claim 12 , wherein the increased second transmission power is a maximum output power (PCMAX) of the UE.

16 . The method of claim 12 , wherein the multiple preambles comprises a first preamble and a second preamble sent over K 1 time-frequency resources that do not overlap in a time domain and at least a third preamble sent over K 2 time-frequency resources that do not overlap in the time domain.

17 . The method of claim 16 , wherein the one or more additional preambles are sent over K 3 time-frequency resources that do not overlap in the time domain.

18 . The method of claim 12 , wherein the first transmission power range is based on a first transmission power value and a first target transmission power value.

19 . The method of claim 12 , wherein the multiple preambles are based on a same sequence and wherein the one or more additional preambles are based on a different sequence.

20 . The method of claim 12 , further comprising:

receiving and measuring one or more downlink reference signals (RS); and

selecting the respective K 1 and K 2 time-frequency resources based on the measured one or more downlink RS; and

determining a first power value for the first transmission power range based on a value of a radio resource control (RRC) indication of a preambleReceivedTargetPower.

21 . The method of claim 20 , wherein the one or more downlink RS is any one of a synchronization signal block (SSB) or a channel state information (CSI) RS.

22 . A user equipment (UE) comprising:

a transmitter;

a receiver; and

a processor coupled to the transmitter and the receiver, wherein the transmitter, the processor and the processor are configured to:

send, to the wireless network in a first random access procedure, multiple preambles over respective K 1 and K 2 time-frequency resources at a first transmission power range, wherein a last preamble sent over the K 2 time frequency resources is the last preamble sent in the first random access procedure;

determine a random access response (RAR) including uplink resources has not been successfully received from the wireless network in response to sending the multiple preambles;

update a preamble power ramping counter; and

send one or more additional random access preambles over determined time-frequency resources, at an increased second transmission power based on the preamble power ramping counter, until the RAR including the uplink resources is successfully received. in a configured window of time or not.

23 . The UE of claim 22 , wherein determining the RAR has not been received includes the processor and receiver configured to monitor, in a random access response window, a physical downlink control channel (PDCCH) scrambled by a radio network temporary identifier (RA-RNTI).

24 . The UE of claim 22 , wherein the respective K 1 and K 2 time-frequency resources comprise consecutive resources in a time domain that do not overlap.

25 . The UE of claim 22 , wherein the increased second transmission power is a maximum output power (PCMAX) of the UE.

26 . The UE of claim 22 , wherein the multiple preambles comprise a first preamble and a second preamble sent over the K 1 time-frequency resources that do not overlap in a time domain and at least a third preamble sent over the K 2 time-frequency resources that do not overlap in the time domain.

27 . The UE of claim 26 , wherein the one or more additional preambles are sent over K 3 time-frequency resources that are consecutive in time and do not overlap in the time domain.

28 . The UE of claim 22 , wherein the first transmission power range is based on a first transmission power value and a first target transmission power value.

29 . The UE of claim 22 , wherein the multiple preambles are based on a same sequence and wherein the one or more additional preambles are based on a different sequence.

30 . The UE of claim 22 , wherein the receiver and the processor are further configured to:

receive and measure one or more downlink reference signals (RS); and

select the respective K 1 and K 2 time-frequency resources based on the measured one or more downlink RS; and

determine a first power value for the first transmission power range based on a value of a radio resource control (RRC) indication of a preambleReceivedTargetPower.

31 . The UE of claim 20 , wherein the one or more downlink RS is any one of a synchronization signal block (SSB) or a channel state information (CSI) RS.