Methods, apparatus and systems for performing a random access procedure in a wireless communication

Patent metadata

Field	Value
Publication number	US-2021219349-A1
Application number	US-202117214039-A
Country	US
Kind code	A1
Filing date	Mar 26, 2021
Priority date	Sep 27, 2018
Publication date	Jul 15, 2021
Grant date	—

Abstract

Methods, apparatus and systems for performing a random access procedure in a wireless communication are disclosed. In one embodiment, a method performed by a wireless communication node is disclosed. The method comprises: receiving, from a wireless communication device, a first message comprising a preamble and a payload for an access to the wireless communication node; and transmitting, to the wireless communication device, a second message in response to the first message.

First claim

1 . A method performed by a wireless communication node, the method comprising:
receiving, from a wireless communication device, a first message comprising a preamble and a payload for an access to the wireless communication node; and transmitting, to the wireless communication device, a second message in response to the first message, wherein the second message is for the wireless communication device to distinguish between a 2-step random access channel (RACH) and a 4-step RACH based on a fixed offset defined in a protocol and added in a calculation of random access radio network temporary identifier (RA-RNTI) for transmitting the second message in the 2-step RACH compared to the 4-step RACH.

2 . The method of claim 1 , further comprising:
configuring a mapping between a first transmission resource for the preamble and a second transmission resource for the payload, wherein the preamble and the payload are received based on the first transmission resource and the second transmission resource, respectively.

3 - 33 . (canceled)

34 . The method of claim 1 , wherein:
a modulation coding scheme (MCS) is configured for the payload.

35 . The method of claim 1 , further comprising:
receiving, from the wireless communication device, a third message, wherein the third message is transmitted, in response to receiving a fallback indication, before a contention resolution timer is started by the wireless communication device.

36 . The method of claim 1 , wherein the second message comprises information related to:
a contention resolution identifier (ID), a cell radio network temporary identifier (C-RNTI), and a time advance (TA) command; or an uplink (UL) grant that comprises subsequent resources for subsequent UL transmissions, and a fallback random access response (RAR).

37 . A method performed by a wireless communication device, the method comprising:
transmitting, to a wireless communication node, a first message comprising a preamble and a payload for an access to the wireless communication node; and receiving, from the wireless communication node, a second message in response to the first message, wherein the second message is for the wireless communication device to distinguish between a 2-step random access channel (RACH) and a 4-step RACH based on a fixed offset defined in a protocol and added in a calculation of random access radio network temporary identifier (RA-RNTI) for transmitting the second message in the 2-step RACH compared to the 4-step RACH.

38 . The method of claim 37 , further comprising:
determining a configuration of a mapping between a first transmission resource for the preamble and a second transmission resource for the payload, wherein the preamble and the payload are transmitted based on the first transmission resource and the second transmission resource, respectively.

39 . The method of claim 37 , wherein:
the wireless communication device is capable of selecting a random access (RA) procedure between a 2-step RACH and a 4-step RACH based on information related to a comparison between a reference signal received power (RSRP) measurement result and a threshold.

40 . The method of claim 37 , wherein the second message comprises information related to:
a contention resolution identifier (ID), a cell radio network temporary identifier (C-RNTI), and a time advance (TA) command; or an uplink (UL) grant that comprises subsequent resources for subsequent UL transmissions, and a fallback random access response (RAR).

41 . The method of claim 37 , further comprising:
selecting, by the wireless communication device, the preamble; and selecting, by the wireless communication device, the payload according to the selected preamble.

42 . The method of claim 37 , wherein:
a modulation coding scheme (MCS) is configured for the payload.

43 . The method of claim 37 , wherein:
In response to a number of failure transmission attempt of the first message reaching a pre-defined threshold, the wireless communication device is configured as a 4-step RACH, wherein the pre-defined threshold is transmitted to the wireless communication device in a radio resource control (RRC) signaling.

44 . The method of claim 37 , further comprising:
in response to receiving a fallback indication, transmitting, by the wireless communication device, a third message and starting a contention resolution timer.

45 . A wireless communication node comprising:
a memory storing instructions; and a processor in communication with the memory, wherein, when the processor executes the instructions, the processor is configured to cause the wireless communication node to:
receive, from a wireless communication device, a first message comprising a preamble and a payload for an access to the wireless communication node, and
transmit, to the wireless communication device, a second message in response to the first message,
wherein the second message is for the wireless communication device to distinguish between a 2-step random access channel (RACH) and a 4-step RACH based on a fixed offset defined in a protocol and added in a calculation of random access radio network temporary identifier (RA-RNTI) for transmitting the second message in the 2-step RACH compared to the 4-step RACH.

46 . The wireless communication node of claim 45 , wherein, when the processor executes the instructions, the processor is configured to further cause the wireless communication node to:
configure a mapping between a first transmission resource for the preamble and a second transmission resource for the payload, wherein the preamble and the payload are received based on the first transmission resource and the second transmission resource, respectively.

47 . The wireless communication node of claim 45 , wherein the second message comprises information related to:
a contention resolution identifier (ID), a cell radio network temporary identifier (C-RNTI), and a time advance (TA) command; or an uplink (UL) grant that comprises subsequent resources for subsequent UL transmissions, and a fallback random access response (RAR).

48 . The wireless communication node of claim 45 , wherein, when the processor executes the instructions, the processor is configured to further cause the wireless communication node to:
receive, from the wireless communication device, a third message, wherein the third message is transmitted, in response to receiving a fallback indication, before a contention resolution timer is started by the wireless communication device.

49 . A wireless communication device comprising:
a memory storing instructions; and a processor in communication with the memory, wherein, when the processor executes the instructions, the processor is configured to cause the wireless communication device to:
transmit, to a wireless communication node, a first message comprising a preamble and a payload for an access to the wireless communication node, and
receive, from the wireless communication node, a second message in response to the first message,
wherein the second message is for the wireless communication device to distinguish between a 2-step random access channel (RACH) and a 4-step RACH based on a fixed offset defined in a protocol and added in a calculation of random access radio network temporary identifier (RA-RNTI) for transmitting the second message in the 2-step RACH compared to the 4-step RACH.

50 . The wireless communication device of claim 49 , wherein, when the processor executes the instruct

Assignees

• Zte Corp

Inventors

• Huang He

Classifications

• H04W74/002 Primary

  Transmission of channel access control information · CPC title

• H04W74/0836

  with 2-step access · CPC title

• H04W74/0833 Primary

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

• H04W74/008

  Electricity · mapped topic

• H04W74/0838 Primary

  using contention-free random access [CFRA] · CPC title