Granted Patent B2

US 12,610,420 · App. 18/107,025 · Granted Apr 21, 2026

Inventors: Qiaoling Yu (Shanghai, CN); Xiaobo Zhang (Shanghai, CN)

Assignee: Apogee 5G Global, LLC

H04W76/19H04W76/20H04W76/30

Abstract

Claims (34)

1 . A user equipment (UE) configured for wireless communications, the UE comprising:

a transceiver; and

a processor, wherein:

the transceiver is configured to receive information indicating a value of a first timer, wherein the first timer is a timer related to small data transfer (SDT);

the processor is configured to start the first timer based on a first message, wherein the first message is used to request transmitting data through a data radio bearer (DRB) in a radio resource control (RRC) inactive state; and

the processor is configured to determine whether to execute an RRC connection re-establishment procedure based on at least a target condition being satisfied and a state of the first timer, wherein the target condition is a condition in a condition set, wherein the condition set comprises: receiving a random access problem indication from a master cell group (MCG) medium access control (MAC) and a state of at least a plurality of second timers.

2 . The UE of claim 1 , wherein the plurality of second timers comprises: T300, T301, T304, T311 and T319.

3 . The UE of claim 1 , wherein the processor is configured to determine to execute the RRC connection re-establishment procedure in response to: receiving the random access problem indication from the MCG MAC, the first timer not running, and the plurality of second timers not running.

4 . The UE of claim 1 , wherein the processor is configured to determine to not execute the RRC connection re-establishment procedure in response to: not receiving the random access problem indication from MCG MAC, the first timer is running, or at least one of the plurality of second timers is running.

5 . The UE of claim 1 , wherein the condition set comprises receiving an indication of a number of radio link control (RLC) retransmissions reaching a maximum value from a MCG RLC.

6 . The UE of claim 1 , wherein the condition set comprises receiving an indication of continuous uplink listen before talk (LBT) failures from a MCG MAC.

7 . The UE of claim 1 , wherein the transceiver is configured to, in response to a determination to execute the RRC connection re-establishment procedure, transmit a second message requesting the RRC connection re-establishment.

8 . The UE of claim 1 , wherein the transceiver is configured to transmit the first message in an RRC inactive state.

9 . The UE of claim 1 , wherein the processor is configured to enter into an RRC idle state in response to a determination to not execute the RRC connection re-establishment procedure.

10 . The UE of claim 9 , wherein the processor is configured to, before entering into RRC idle state: reset a MAC; and indicate an RRC connection release to a higher layer.

11 . A method for use in a user equipment (UE) configured for wireless communications, the method comprising:

receiving information indicating a value of a first timer, wherein the first timer is a timer related to small data transfer (SDT);

starting the first timer based on a first message, wherein the first message is used to request transmitting data through a data radio bearer (DRB) in a radio resource control (RRC) inactive state; and

determining whether to execute an RRC connection re-establishment procedure based on at least a target condition being satisfied and a state of the first timer, wherein the target condition is a condition in a condition set, wherein the condition set comprises: receiving a random access problem indication from a master cell group (MCG) medium access control (MAC) and a state of at least a plurality of second timers.

12 . The method of claim 11 , wherein the plurality of second timers comprises: T300, T301, T304, T311 and T319.

13 . The method of claim 11 , further comprising:

determining to execute the RRC connection re-establishment procedure in response to: receiving the random access problem indication from the MCG MAC, the first timer not running, and the plurality of second timers not running.

14 . The method of claim 11 , further comprising:

determining to not execute the RRC connection re-establishment procedure in response to: not receiving the random access problem indication from MCG MAC, the first timer is running, or at least one of the plurality of second timers is running.

15 . The method of claim 11 , wherein the condition set comprises receiving an indication of a number of radio link control (RLC) retransmissions reaching a maximum value from a MCG RLC.

16 . The method of claim 11 , wherein the condition set comprises receiving an indication of continuous uplink listen before talk (LBT) failures from a MCG MAC.

17 . The method of claim 11 , further comprising:

in response to a determination to execute the RRC connection re-establishment procedure, transmitting a second message requesting the RRC connection re-establishment.

18 . The method of claim 11 , further comprising:

transmitting the first message in an RRC inactive state.

19 . The method of claim 11 , further comprising:

entering into an RRC idle state in response to a determination to not execute the RRC connection re-establishment procedure.

20 . The method of claim 19 , further comprising:

before entering into RRC idle state: resetting a MAC; and indicating an RRC connection release to a higher layer.

Assignments (3)

Priority Claims (1)

Continuity (1)

References Cited (19)