Method and apparatus for transmitting a signal in wireless communication system

Patent metadata

Field	Value
Publication number	US-2022116999-A1
Application number	US-201917419593-A
Country	US
Kind code	A1
Filing date	Dec 30, 2019
Priority date	Dec 29, 2018
Publication date	Apr 14, 2022
Grant date	—

Abstract

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure provides a method for operating a user equipment (UE) in wireless communication system. The method includes: receiving, from a base station, configuration information for a two-step random access transmission; determining a resource configuration for transmitting a first message of the two-step random access transmission based on the obtained configuration information for the two-step random access transmission, wherein the first message comprises a preamble and data; transmitting, to the base station, the first message according to the determined resource configuration; detecting a second message from the base station as a feedback of the first message; and performing a subsequent operation according to the detected second message.

First claim

1 - 15 . (canceled)

16 . A method of operating a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station (BS), a radio resource control (RRC) message or a reference signal; determining a random access (RA) type between a 2-step RA and a 4-step RA based on the received RRC message or a reference signal received power (RSRP) of the received reference signal; and transmitting, to a base station (BS), a first message including a preamble for an RA based on the determined RA type.

17 . The method of claim 16 ,
wherein, if the RA type is determined based on the RRC message:
in case the RRC message indicates the 2-step RA, the RA type is determined as the 2-step RA, or
in case the RRC message does not indicate the 2-step RA, the RA type is determined as the 4-step RA.

18 . The method of claim 16 ,
wherein, if the RA type is determined based on the RSRP:
in case the RSRP is above a configured threshold, the RA type is determined as the 2-step RA, or
in case the RSRP is not above the configured threshold, the RA type is determined as the 4-step RA.

19 . The method of claim 16 , further comprising:
after transmitting the first message, detecting a second message of random access response (RAR) within an RAR window, wherein, in case the first message includes a first radio network temporary identifier (RNTI), the second message includes the first RNTI, and wherein, in case the first message does not include the first RNTI, the second message includes a second RNTI.

20 . The method of claim 16 ,
wherein, if the RA type is determined as the 2-step RA:
after transmitting the first message, receiving, from the BS, a second message of random access response (RAR); and
in case a random access preamble identifier included in the second message corresponds to a preamble index included in the first message, and the second message is associated with a fallback operation, and an uplink (UL) grant is received, transmitting, to the BS, a message 3 (msg3) of the 4-step RA including a medium access control protocol data unit (MAC PDU) included in the first message.

21 . The method of claim 16 ,
wherein, if the RA type is determined as the 2-step RA, the method further comprises:
transmitting, to the BS, a physical uplink shared channel (PUSCH) associated with the first message including the preamble; and
in response to transmitting the PUSCH associated with the first message including the preamble, detecting a second message from the BS within a configured window, and
wherein the window starts at an earliest control resource set (CORESET) after a configured time unit from a last symbol associated with transmitting the PUSCH.

22 . The method of claim 16 ,
wherein, if the RA type is determined as the 2-step RA, the method further comprises:
transmitting, to the BS, a physical uplink shared channel (PUSCH) associated with the first message including the preamble, and
wherein a same spatial filter is used for a transmission of the preamble and a transmission of the PUSCH.

23 . A method of operating a base station (BS) in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE), a radio resource control (RRC) message or a reference signal; and receiving, from a UE, a first message including a preamble for a random access (RA) based on a RA type, wherein the RA type is one of a 2-step RA and a 4-step RA based on the transmitted RRC message or a reference signal received power (RSRP) of the transmitted reference signal.

24 . The method of claim 23 ,
wherein, if the RA type is based on the RRC message:
in case the RRC message indicates the 2-step RA, the RA type is selected as the 2-step RA, or
in case the RRC does not indicate the 2-step RA, the RA type is selected as the 4-step RA.

25 . The method of claim 23 ,
wherein, if the RA type is based on the RSRP:
in case the RSRP is above a configured threshold, the RA type is selected as the 2-step RA, or
in case the RSRP is not above the configured threshold, the RA type is selected as the 4-step RA.

26 . The method of claim 23 , further comprising:
after receiving the first message, transmitting, to the UE, a second message of random access response (RAR) within a RAR window, wherein, in case the first message includes a first radio network temporary identifier (RNTI), the second message includes the first RNTI, and wherein, in case the first message does not include the first RNTI, the second message includes a second RNTI.

27 . The method of claim 23 ,
wherein, if the RA type is the 2-step RA, the method further comprises:
after receiving the first message, transmitting, to the UE, a second message of random access response (RAR); and
in case a random access preamble identifier included in the second message corresponds to a preamble index included in the first message, and the second message is associated with a fallback operation, and an uplink (UL) grant is transmitted, receiving, from the UE, a message 3 (msg3) of the 4-step RA including a medium access control protocol data unit (MAC PDU) included in the first message.

28 . The method of claim 23 ,
wherein, if the RA type is the 2-step RA, the method further comprises:
receiving, from the UE, a physical uplink shared channel (PUSCH) associated with the first message including the preamble; and
in response to receiving the PUSCH associated with the first message including the preamble, transmitting a second message to the UE within a configured window, and
wherein the window starts at an earliest control resource set (CORESET) after a configured time unit from a last symbol associated with transmitting the PUSCH.

29 . The method of claim 23 ,
wherein, if the RA type is the 2-step RA, the method further comprises:
receiving, from the UE, a physical uplink shared channel (PUSCH) associated with the first message including the preamble, and
wherein a same spatial filter is used for a transmission of the preamble and a transmission of the PUSCH.

30 . A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and at least one processor coupled to the transceiver, and configured to:
determine a random access (RA) type between a 2-step RA and a 4-step RA based on a received radio resource control (RRC) message or a reference signal received power (RSRP) of a received reference signal; and
transmit, to a base station (BS), a first message including a preamble for a RA based on the determined RA type.

31 . The UE of claim 30 ,
wherein, if the RA type is determined based on the RRC message:
in case the RRC message indicates the 2-step RA, the RA type is determined as the 2-step RA, or
in case the RRC message does not indicate the 2-step RA, the RA type is determined as the 4-step RA.

32 . The UE of claim 30 ,
wherein, if the RA type is determined based on the RSRP:
in case the RSRP is above a configured threshold, the RA type is determined as the 2-step RA, or
in case the RSRP is not above the configured threshold, the RA type is determined as the 4-step RA.

33 . The UE of claim 30 , wherein the at least one processor is further configured to:
in response to the transmitting first message, detect a second message of random access response (RAR) including a radio network temporary identifier (RNTI) within a RAR window, and wherein a number of possible types for the RNTI is 2.

34 . The UE of claim 30

Assignees

• Samsung Electronics Co Ltd

Inventors

• Xiong Qi
• Yu Bin
• Sun Feifei
• Wang Yi

Classifications

• H04L5/0051 Primary

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W74/0836

  with 2-step access · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04L1/1861

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title