Method and device used in communication node for wireless communication

Patent metadata

Field	Value
Publication number	US-2025150993-A1
Application number	US-202519008672-A
Country	US
Kind code	A1
Filing date	Jan 3, 2025
Priority date	Jul 5, 2022
Publication date	May 8, 2025
Grant date	—

Abstract

The present application provides a method and a device in a communication node for wireless communications. A communication node receives an Absolute Timing Advance Command MAC CE in a first random access procedure; as a response to the Absolute Timing Advance Command MAC CE being received, determines starting or restarting a first timer or a second timer according to whether at least a first inactive procedure is ongoing; the behavior of determining starting or restarting a first timer or second timer according to at least whether a first inactive procedure is ongoing includes: if the first inactive procedure is ongoing, starting or restarting the first timer; if the first inactive procedure is not ongoing, starting or restarting the second timer; both the first timer and the second timer are used to maintain uplink time alignment; the first timer and the second timer are different.

First claim

What is claimed is:

1 . A first node for wireless communications, comprising:
the first processor, receiving an Absolute Timing Advance Command MAC (Medium Access Control) CE (Control Element) in a first random access procedure; as a response to the Absolute Timing Advance Command MAC CE being received, determining starting or restarting a first timer or a second timer according to whether at least a first inactive procedure is ongoing; wherein the behavior of determining starting or restarting a first timer or second timer according to at least whether a first inactive procedure is ongoing includes: if the first inactive procedure is ongoing, starting or restarting the first timer; if the first inactive procedure is not ongoing, starting or restarting the second timer; both the first timer and the second timer are used to maintain uplink time alignment; the first timer and the second timer are different.

2 . The first node according to claim 1 , wherein the first timer is a cg-SDT (Small Data Transmission)-TimeAlignmentTimer; the second timer is a timeAlignmentTimer; the first timer is associated with a first TAG (Timing Advance Group); the second timer is associated with the first TAG; wherein the first TAG is a PTAG (Primary TAG), or an index of the first TAG is equal to 0.

3 . The first node according to claim 1 , wherein the first timer is used to determine how long a MAC entity considers CG-SDT to be uplink time aligned; the second timer is used to determine how long a MAC entity considers all serving cells in the first TAG to be uplink time aligned.

4 . The first node according to claim 1 , wherein the Absolute Timing Advance Command MAC CE comprises a Timing Advance Command field.

5 . The first node according to claim 1 , wherein the first inactive procedure is a CG-SDT procedure.

6 . The first node according to claim 1 , wherein the “if the first inactive procedure is ongoing, starting or restarting the first timer; if the first inactive procedure is not ongoing, starting or restarting the second timer” can be replaced with: if the first inactive procedure is ongoing, starting or restarting the first timer; otherwise, starting or restarting the second timer.

7 . The first node according to claim 1 , wherein the first random access procedure is a contention-based random access procedure; the first random access procedure is a 2-step random access procedure; when the first random access procedure is initialized, set RA (Random Access)_TYPE to 2-step RA.

8 . The first node according to claim 1 , comprising:
the first processor, receiving a first signaling and a first MAC PDU (Protocol Data Unit) in the first random access procedure, the first signaling indicating scheduling information of a PDSCH (Physical Downlink Shared Channel), the PDSCH being used to bear the first MAC PDU, the first MAC PDU comprising at least the Absolute Timing Advance Command MAC CE; wherein a CRC (Cyclic redundancy check) of the first signaling is scrambled by a first RNTI, and the first RNTI is used to identify the first node.

9 . The first node according to claim 8 , comprising:
the first processor, transmitting a first random access preamble and a second MAC PDU in the first random access procedure, the second MAC PDU comprising at least a first C (Cell)-RNTI (Radio Network Temporary Identifier) MAC CE, the first C-RNTI MAC CE comprising the first RNTI; wherein PUSCH (Physical Uplink Shared Channel) resources associated with the first random access preamble are used to bear the second MAC PDU.

10 . The first node according to claim 9 , wherein the first C-RNTI MAC CE is a C-RNTI MAC CE; the first RNTI is a C-RNTI of the first node in a PCell (Primary Cell); the first random access preamble is used to indicate that a type of the first random access procedure is 2-step random access.

11 . The first node according to claim 9 , wherein in a running period of msgB-ResponseWindow, the first signaling and the first MAC PDU are received; in the first random access procedure, the first random access preamble being transmitted is used to determine a start of the msgB-Response Window;
wherein the first MAC PDU comprises only one MAC subPDU, the MAC subPDU consists of the Absolute Timing Advance Command MAC CE and a MAC subheader corresponding to the Absolute Timing Advance Command MAC CE; or, the first MAC PDU comprises multiple MAC subPDUs, and one of the multiple MAC subPDUs consists of the Absolute Timing Advance Command MAC CE and a MAC subheader corresponding to the Absolute Timing Advance Command MAC CE.

12 . The first node according to claim 8 , comprising:
the first processor, receiving a first message, the first message comprising a first configuration uplink grant and a maximum value of the first timer; as a response to the first message being received, starting the first timer; in RRC (Radio Resource Control)_INACTIVE state, as a response to a first condition set being satisfied, initiating the first inactive procedure; in the first inactive procedure, transmitting a second message, the second message being used to request performing a data transmission in the RRC_INACTIVE state; receiving a target signaling, the target signaling being used to determine that the second message is successfully transmitted; wherein the first message indicates entering or maintaining the RRC_INACTIVE state; the target signaling is scrambled by the first RNTI; the first condition set includes: the first timer is running; the first random access procedure is initiated after the target signaling; when the Absolute Timing Advance Command MAC CE is received, the first inactive procedure is ongoing.

13 . The first node according to claim 12 , wherein the first message is a suspendConfig in an RRCRelease message; the second message is an RRCResumeRequest message or an RRCResumeRequest1 message; in the first inactive procedure, start a timer T 319 a ; the target signaling is a DCI; the target signaling is addressed to the first RNTI, and the target signaling is a response to an initial transmission of the first inactive procedure, the initial transmission comprising the second message.

14 . The first node according to claim 12 , wherein the “performing a data transmission in the RRC_INACTIVE state” refers to: SDT;
or,
the “performing a data transmission in the RRC_INACTIVE state” refers to: MO-SDT;
or,
the “performing a data transmission in the RRC_INACTIVE state” refers to: MT-SDT.

15 . The first node according to claim 12 , comprising:
the first processor, receiving a first RAR (Random Access Response) in a second random access procedure; transmitting a third MAC PDU according to the first RAR, the third MAC PDU comprising at least a second C-RNTI MAC CE, the second C-RNTI MAC CE comprising the first RNTI; as a response to the third MAC PDU being transmitted, receiving a second signaling; as a response to the first RAR being received, starting or restarting the second timer; as a response to a contention resolution for the second random access procedure being considered successfully, stopping the second timer, and starting or restarting the first timer; wherein the second signaling is scrambled by the first RNTI; the second random access procedure is initiated after the target signaling; a contention solution for the second random access procedure is considered successful, the first inactive procedure is ongoing.

16 . The first node according to claim 15 , wherein the first RAR is a MAC RAR; or, the first RAR is a fallbackRAR.

17 . The first node according to claim 15 ,

Assignees

• Yu Qiaoling
• Zhang Xiaobo
• Shanghai Tuiluo Communication Tech Partnership Limited Partnership

Inventors

• Yu Qiaoling
• Zhang Xiaobo

Classifications

• H04W74/0833 Primary

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

• H04W56/0045

  compensating for timing error by altering transmission time · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04W56/00

  Synchronisation arrangements · CPC title

• H04W74/085

  collision avoidance · CPC title