Methods, devices, and medium for communication

Inventors: Da Wang (Beijing, CN); Gang Wang (Beijing, CN)

Assignee: NEC CORPORATION

H04W76/30 H04W76/19 H04W76/20

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Quick Facts

Patent No.: US 12696348
App. No.: 18/575,549
Granted: Jul 28, 2026
Kind: B2

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Abstract

Example embodiments of the present disclosure relate to small data transmission. Although the present disclosure, the stored data is not taken into consideration when calculating data volume for small data transmission, and thus correct data volume value can be obtained thereby. Further, the terminal device may obtain information about volume of new data before calculating data volume for small data transmission. In addition, during small data transmission, the reported buffer status report may indicate an actual state of the remaining small data transmission data. Further, when the terminal device fails to transmit small data transmission data via 4-step random access procedure, the terminal device may fall back to 4-step random access small data transmission properly.

Claims (55)

1 . A method of a User Equipment (UE), the method comprising:

receiving, from a network, a Radio Resource Control (RRC) Release message;

triggering a Packet Data Convergence Protocol (PDCP) entity to perform Service Data Unit (SDU) discard for a Signalling Radio Bearer (SRB) in a case where the RRC Release message is received and a Small Data Transmission (SDT) configuration is included in the RRC Release message; and

determining, after the SDU discard is performed, whether a data volume of pending uplink data for an SDT procedure is less than or equal to a data volume threshold.

2 . The method according to claim 1 , further comprising:

re-establishing a Radio Link Control (RLC) entity for an RLC bearer in the case where the RRC Release message is received and the SDT configuration is included in the RRC Release message.

3 . The method according to claim 2 , comprising:

calculating, after the RLC entity is re-established and the SDU discard is performed, the data volume of pending uplink data for the SDT procedure.

4 . The method according to claim 2 , comprising:

determining, after the RLC entity is re-established and the SDU discard is performed, whether the data volume of pending uplink data for the SDT procedure is less than or equal to the data volume threshold.

5 . The method according to claim 1 , further comprising:

initiating the SDT procedure in the case where the RRC Release message is received and the SDT configuration is included in the RRC Release message.

6 . The method according to claim 1 , further comprising:

initiating the SDT procedure in a case where:

the RRC Release message is received and the SDT configuration is included in the RRC Release message, and

the data volume is less than or equal to the data volume threshold.

7 . A method of a Radio Access Network (RAN) node, the method comprising:

sending, to a User Equipment (UE), a Radio Resource Control (RRC) Release message with a Small Data Transmission (SDT) configuration,

wherein the SDT configuration is configured to cause the UE to trigger a Packet Data Convergence Protocol (PDCP) entity to perform Service Data Unit (SDU) discard for a Signalling Radio Bearer (SRB); and

receiving, from the UE, an RRC Resume message and uplink SDT data,

wherein whether a data volume of the pending uplink data for an SDT procedure is less than or equal to a data volume threshold is determined, after the SDU discard is performed.

8 . The method according to claim 7 ,

wherein the SDT configuration is configured to cause the UE to re-establish a Radio Link Control (RLC) entity for a RLC bearer.

9 . A User Equipment (UE) comprising:

a memory; and

a processor coupled with the memory, wherein the processor is configured to:

receive, from a network, a Radio Resource Control (RRC) Release message,

trigger a Packet Data Convergence Protocol (PDCP) entity to perform Service Data Unit (SDU) discard for a Signalling Radio Bearer (SRB) in a case where the RRC Release message is received and a Small Data Transmission (SDT) configuration is included in the RRC Release message, and

determine, after the SDU discard is performed, whether a data volume of pending uplink data for an SDT procedure is less than or equal to a data volume threshold.

10 . The UE according to claim 9 ,