Data transmission method and user equipment
AssigneeSharp Kabushiki Kaisha
InventorsFangYing Xiao, Renmao Liu
Life of this patent
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Abstract
A data transmission method, wherein when small data arrives, user equipment (UE) in a radio resource control inactive state RRC_INACTIVE can establish a communication with a base station without entering an RRC connected state, so as to perform small data transmission (SDT). An RNAU timer for controlling a periodic radio access network (RAN) based notification area update is set for the base station. For the SDT, an SDT timer for SDT small data transmission is set. A small data transmission data radio bearer (DRB) is configured for the user equipment. When an RRC resume procedure is triggered by arrival of data at the DRB, a high layer triggering small data transmission, or the like, the user equipment starts the SDT timer.
Claims2
A method performed by a user equipment (UE), the method comprising:
- initiating a Radio Resource Control (RRC) resume procedure, wherein, based on a determination that a first timer expires but a second timer is not running, the RRC resume procedure is initiated for RAN-based Notification Area update (RNAU);
- transmitting an RRCResumeRequest message or an RRCResumeRequest1 message when the RRC resume procedure is initiated;
- starting the second timer after the RRC resume procedure is initiated;
- and
- causing an RRC layer of the UE to perform operations of entering RRC_IDLE based on a determination, during running of the second timer, that the RRC layer receives an indication from a radio link control (RLC) layer that the maximum number of retransmissions has been reached, wherein
- the first timer is a timer T380 that triggers a periodic RNAU procedure, and
- the second timer is a timer defined for small data transmission (SDT) which starts upon transmission of the RRCResumeRequest message or the RRCResumeRequest1 message when the RRC resume procedure is initiated for the SDT.
A user equipment (UE), comprising:
- a processor;
- and
- a memory storing instructions,
- wherein the processor is configured by the instructions to cause the UE to:
- initiate a Radio Resource Control (RRC) resume procedure, wherein, based on a determination that a first timer expires but a second timer is not running, the RRC resume procedure is initiated for RAN-based Notification Area update (RNAU);
- transmit an RRCResumeRequest message or an RRCResumeRequest1 message when the RRC resume procedure is initiated;
- start the second timer after the RRC resume procedure is initiated;
- and
- cause an RRC layer of the UE to perform operations of entering RRC_IDLE based on a determination, during running of the second timer, that the RRC layer receives an indication from a radio link control (RLC) layer that the maximum number of retransmissions has been reached,
- the first timer is a timer T380 that triggers a periodic RNAU procedure, and
- the second timer is a timer defined for small data transmission (SDT) which starts upon transmission of the RRCResumeRequest message or the RRCResumeRequest1 message when the RRC resume procedure is initiated for the SDT.
Dependencies are inferred from the claim text.