Method performed by user equipment, and user equipment
Provided in the present invention are a method performed by user equipment, and user equipment. The method performed by user equipment includes: in the case that the user equipment is in an inactive state and needs to perform small data transmission, triggering a radio resource control (RRC) connection resumption procedure; and in the RRC connection resumption procedure, using, by the user equipment, a predefined default configuration for a data radio bearer (DRB), and restoring configurations in RRC configurations for the DRB other than the default configuration. Therefore, in the case that user equipment is in an inactive state and needs to perform small data transmission, additional signaling overhead can be avoided, and power consumption can be reduced, thereby improving communication efficiency and reliability of a wireless communication system.
1 . A method performed by user equipment, comprising:
receiving a Radio Resource Control (RRC) message includes data radio bearer (DRB) identities for DRBs configured for small data transmission (SDT), wherein one of the DRB identities identifies a DRB configured for SDT and used for data transmission in an RRC connected state,
initiating an RRC resumption procedure for SDT in a case that the following condition (1) and condition (2) are fulfilled:
the condition (1) is that data provided by an upper layer for transmission is from the DRBs configured for SDT, and
the condition (2) is that the upper layer requests resumption of an RRC connection,
in a case that the RRC resumption procedure for SDT is triggered, restoring configurations for the DRBs configured for SDT,
re-establishing Packet Data Convergence Protocol (PDCP) entities for the DRBs configured for SDT,
resuming the DRBs configured for SDT, and
submitting an RRC Resume Request message for transmission to lower layers.
2 . User equipment, comprising:
a processor; and
a memory in electronic communication with the processor,
wherein instructions stored in the memory are executable to:
receive a Radio Resource Control (RRC) message includes data radio bearer (DRB) identities for DRBs configured for small data transmission (SDT), wherein one of the DRB identities identifies a DRB configured for SDT and used for data transmission in an RRC connected state,
initiate an RRC resumption procedure for SDT in a case that the following condition (1) and condition (2) are fulfilled:
the condition (1) is that data provided by an upper layer for transmission is from the DRBs configured for SDT, and
the condition (2) is that the upper layer requests resumption of an RRC connection,
in a case that the RRC resumption procedure for SDT is triggered, restore configurations for the DRBs configured for SDT,
re-establish Packet Data Convergence Protocol (PDCP) entities for the DRBs configured for SDT,
resume the DRBs configured for SDT, and
submit an RRC Resume Request message for transmission to lower layers.