IP Library › Granted Patent US 12707528
Granted Patent B2
US 12707528 · App. 18/280,519 · Granted Aug 11, 2026

Method and apparatus for updating RNA during SDT in wireless communication system

Inventor: Anil Agiwal (Suwon-si, KR)
Assignee: Samsung Electronics Co., Ltd.
H04W76/27H04W76/38
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Quick Facts
Patent No.
US 12707528
App. No.
18/280,519
Granted
Aug 11, 2026
Kind
B2
Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system is provided. The method may include: receiving, from a base station, a radio resource control (RRC) release message including a parameter indicating a timer that triggers a radio access network based notification area (RNA) update; transitioning to an RRC inactive state and starting the timer, based on the RRC release message; in case that criteria for small data transmission (SDT) are met while the timer is running, transmitting, to the base station, an RRC resume request message for the SDT, wherein the timer is not stopped when the RRC resume request message is transmitted; and in case that the timer expires while the SDT is ongoing, setting a variable indicating whether the RNA update is pending, to a true value.

Claims (46)

1 . A method performed by a terminal in a wireless communication system, the method comprising:

receiving, from a base station, a radio resource control (RRC) release message including timer related information associated with a radio access network based notification area (RNA) update procedure;

starting a timer T380, based on the timer related information, wherein the timer T380 is associated with triggering the RNA update procedure;

in case that criteria for a small data transmission (SDT) procedure are met while the timer T380 is running, transmitting, to the base station, an RRC resume request message for the SDT procedure,

wherein the timer T380 is not stopped when the RRC resume request message is transmitted;

in case that the timer T380 expires, identifying whether the SDT procedure is ongoing;

in case that the SDT procedure is ongoing, setting a variable pendingRNA-Update to true, wherein the variable pendingRNA-Update indicates whether there is a pending RNA update procedure or not; and

in case that the SDT procedure is terminated, initiating an RRC connection resume procedure with resumeCause set to rna-Update, based on the variable pendingRNA-Update being set to true.

2 . The method of claim 1 , further comprising:

in case that an RRC message or dedicated control channel (DCCH) service data unit (SDU) is received from the base station during the SDT procedure and the variable pendingRNA-Update is set to true, setting the variable pendingRNA-Update to false.

3 . The method of claim 1 , wherein the SDT procedure corresponds to a random access (RA)-SDT, and

wherein an RA procedure is initiated for the RA-SDT.

4 . The method of claim 3 , further comprising:

in case that the RA procedure is completed and the variable pendingRNA-Update is set to true, setting the variable pendingRNA-Update to false.

5 . The method of claim 3 , further comprising:

in case that a physical downlink control channel (PDCCH) addressed to a cell-radio network temporary identifier (C-RNTI) corresponding to the terminal is received from the base station and the variable pendingRNA-Update is set to true, setting the variable pendingRNA-Update to false.

6 . The method of claim 1 , wherein the SDT procedure corresponds to a configured grant (CG)-SDT, and

wherein one or more uplink (UL) packets are transmitted to the base station by using a CG resource during the CG-SDT.

7 . The method of claim 6 , further comprising:

in case that an acknowledgement message is received after a first UL packet, among the one or more UL packets, is received from the base station, and the variable pendingRNA-Update is set to true, setting the variable pendingRNA-Update to false.

8 . The method of claim 6 , further comprising:

in case that a first PDCCH addressed to a C-RNTI or an SDT-RNTI corresponding to the terminal is received from the base station and the variable pendingRNA-Update is set to true, setting the variable pendingRNA-Update to false.

9 . A terminal in a wireless communication system, the terminal comprising:

at least one transceiver;

at least one processor communicatively coupled to the at least one transceiver; and

at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor to cause the terminal to:

receive, from a base station, a radio resource control (RRC) release message including timer related information associated with a radio access network based notification area (RNA) update procedure;

start a timer T380, based on the timer related information, wherein the timer T380 is associated with triggering the RNA update procedure;

in case that criteria for a small data transmission (SDT) procedure are met while the timer T380 is running, transmit, to the base station, an RRC resume request message for the SDT procedure,

wherein the timer T380 is not stopped when the RRC resume request message is transmitted;

in case that the timer T380 expires, identify whether a small data transmission (SDT) procedure is ongoing;

in case that the SDT procedure is ongoing, set a variable pendingRNA-Update to true, wherein the variable pendingRNA-Update indicates whether there is a pending RNA update procedure or not; and

in case that the SDT procedure is terminated, initiate an RRC connection resume procedure with resumeCause set to rna-Update, based on the variable pendingRNA-Update being set to true.

10 . The terminal of claim 9 , wherein the at least one processor terminal is further caused to:

in case that an RRC message or dedicated control channel (DCCH) service data unit (SDU) is received from the base station during the SDT procedure and the variable pendingRNA-Update is set to true, set the variable pendingRNA-Update to false value.

11 . The terminal of claim 9 , wherein the SDT procedure corresponds to a random access (RA)-SDT, and

wherein an RA procedure is initiated for the RA-SDT.

12 . The terminal of claim 11 , wherein the terminal is further caused to:

in case that the RA procedure is completed and the variable pendingRNA-Update is set to true, set the variable pendingRNA-Update to false.

13 . One or more non-transitory computer-readable storage media storing computer-executable instructions that, when executed by at least one processor of a terminal, cause the terminal to perform operations, the operations comprising:

receiving, from a base station, a radio resource control (RRC) release message including timer related information associated with a radio access network based notification area (RNA) update procedure;

starting a timer T380, based on the timer related information, wherein the timer T380 is associated with triggering the RNA update procedure;

in case that criteria for a small data transmission (SDT) procedure are met while the timer T380 is running, transmitting, to the base station, an RRC resume request message for the SDT procedure, wherein the timer T380 is not stopped when the RRC resume request message is transmitted;

in case that the timer T380 expires, identifying whether the SDT procedure is ongoing;

in case that the SDT procedure is ongoing, setting a variable pendingRNA-Update to true, wherein the variable pendingRNA-Update indicates whether there is a pending RNA update procedure or not; and

in case that the SDT procedure is terminated, initiating an RRC connection resume procedure with resumeCause set to rna-Update, based on the variable pendingRNA-Update being set to true.