Data transmission during RRC inactive state in wireless communication
The present application provides a method and device for wireless communications. A first node receives a first paging message; as a response to receiving the first paging message, executes a first procedure, and the behavior of executing a first procedure comprises transmitting a first message; wherein the first paging message instructs a first radio bearer executing data transmission in RRC_INACTIVE state; the first message at least comprises a CCCH message; whether a first condition set is met is used to determine whether a first sub-message is comprised in the first message, when all conditions in the first condition set are met, the first message does not comprise the first sub-message; when any condition in the first condition set is not met, the first message comprises the first sub-message. The present application effectively supports downlink-triggered Small Data Transmission (SDT).
1 . A user equipment (UE) for wireless communications, the UE comprising:
a receiver configured to receive a first paging message indicating the UE and instructing a first radio bearer set to execute data transmission in radio resource control inactive (RRC_INACTIVE) state; and
a processor and a transmitter configured to, as a response to receiving the first paging message, transmit a Common Control Channel (CCCH) message;
wherein a first condition set is used to determine whether the CCCH message comprises a first sub-message, wherein when all conditions in the first condition set are met, the CCCH message does not comprise the first sub-message; wherein, when any condition in the first condition set is not met, the CCCH message comprises the first sub-message; wherein the first condition set comprises that pending uplink data belonging to a radio bearer other than the first radio bearer set does not exist; and radio resources occupied by an initial transmission of the CCCH message are reserved for a small data transmission (SDT) procedure.
2 . The UE according to claim 1 , wherein the first sub-message is a dedicated control channel (DCCH) message; and wherein the SDT procedure is one of a random access (RA)-SDT procedure or a configured grant (CG)-SDT procedure.
3 . The UE according to claim 1 ,
wherein, when all conditions in the first condition set are met, the processor is further configured to resume all radio bearer(s) in the first radio bearer set.
4 . The UE according to claim 1 ,
wherein, when all conditions in the first condition set are met, as the response to receiving the first paging message, the processor is further configured to resume all radio bearer(s) in the first radio bearer set.
5 . The UE according to claim 1 ,
wherein, when any condition in the first condition set is not met, the receiver is further configured to receive a second message, in response to the CCCH message, the second message being used to instruct resuming all radio bearer(s) in the first radio bearer set and all suspended radio bearer(s) other than the first radio bearer set.
6 . The UE according to claim 1 , wherein a radio bearer other than the first radio bearer set is not configured to execute data transmission in the RRC_INACTIVE state, or a radio bearer other than the first radio bearer set is not established.
7 . The UE according to claim 1 , wherein the receiver is further configured to receive a third message before receiving the first paging message, the third message being used to instruct entering into or maintaining the RRC_INACTIVE state; and wherein the third message is used to configure data transmission of the first radio bearer set in the RRC_INACTIVE state.
8 . A base station for wireless communications, the base station comprising:
a transmitter configured to transmit a first paging message indicating a user equipment (UE) and instructing a first radio bearer set to execute data transmission in radio resource control inactive (RRC INACTIVE) state; and
a receiver configured to receive, in response to the first paging message, a Common Control Channel (CCCH) message;
wherein a first condition set is met is used to determine whether the CCCH message comprises a first sub-message, wherein, when all conditions in the first condition set are met, the CCCH message does not comprise the first sub-message; wherein when any condition in the first condition set is not met, the CCCH message comprises the first sub-message; wherein the first condition set comprises that pending uplink data belonging to a radio bearer other than the first radio bearer set does not exist; and radio resources occupied by an initial transmission of the CCCH message are reserved for a small data transmission (SDT) procedure.
9 . The base station according to claim 8 , wherein the first sub-message is a dedicated control channel (DCCH) message; and wherein the SDT procedure is one of a random access (RA)-SDT procedure or a configured grant (CG)-SDT procedure.
10 . The base station according to claim 8 , wherein when all conditions in the first condition set are met, all radio bearer(s) in the first radio bearer set are resumed.
11 . The base station according to claim 8 , wherein when all conditions in the first condition set are met, and as a further response to the first paging message being received, all radio bearer(s) in the first radio bearer set are resumed.
12 . The base station according to claim 8 ,
wherein, when any condition in the first condition set is not met, as the response to receiving the CCCH message, the transmitter is further configured to transmit a second message used to instruct resuming all radio bearer(s) in the first radio bearer set and all suspended radio bearer(s) other than the first radio bearer set.
13 . The base station according to claim 8 , wherein a radio bearer other than in the first radio bearer set is not configured to execute data transmission in the RRC_INACTIVE state, or a radio bearer other than the first radio bearer set is not established.
14 . The base station according to claim 8 ,
wherein the transmitter is further configured to transmit a third message before transmitting the first paging message, wherein the third message is used to instruct the UE into entering or maintaining the RRC_INACTIVE state; and wherein the third message is used to configure the UE for data transmission of the first radio bearer set in the RRC_INACTIVE state.
15 . A method for a user equipment (UE) in wireless communications, comprising:
receiving a first paging message, the first paging message instructing the UE of a first radio bearer set to execute data transmission in radio resource control inactive (RRC_INACTIVE) state; and
as a response to receiving the first paging message, transmitting a Common Control Channel (CCCH) message;
wherein a first condition set is used to determine whether the CCCH message comprises a first sub-message, wherein when all conditions in the first condition set are met, the first message does not comprise the first sub-message; when any condition in the first condition set is not met, the CCCH message comprises the first sub-message; wherein the first condition set comprises that pending uplink data belonging to a radio bearer other than the first radio bearer set does not exist; and radio resources occupied by an initial transmission of the CCCH message are reserved for a small data transmission (SDT) procedure.
16 . The method according to claim 15 , wherein the first sub-message is a dedicated control channel (DCCH) message; and wherein the SDT procedure is one of an RA-SDT procedure or a CG-SDT procedure.
17 . The method according to claim 15 ,
wherein, when all conditions in the first condition set are met, the method includes resuming all radio bearer(s) in the first radio bearer set.
18 . The method according to claim 15 ,
wherein, when all conditions in the first condition set are met, as the response to receiving the first paging message, the method further comprises: resuming all radio bearer(s) in the first radio bearer set.
19 . The method according to claim 15 ,
wherein, when any condition in the first condition set is not met, the method further comprises: receiving a second message in response to the CCCH message, the second message being used to instruct resuming all radio bearer(s) in the first radio bearer set and all suspended radio bearer(s) other than the first radio bearer set.
20 . The method according to claim 15 , wherein a radio bearer other than the first radio bearer set is not configured to execute data transmission in the RRC_INACTIVE state, or a radio bearer other than the first radio bearer set is not established.