Communication control method, radio terminal, apparatus and base station
A communication control method used in a user equipment, a user equipment, an apparatus for controlling a user equipment, and a base station that communicates with user equipment. The user equipment performs a predetermined data transmission in which it transmits uplink user data in an RRC idle state. When the user equipment is in an RRC connected state, it transmits an RRC message to a base station indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode. The base station receives, from user equipment when the user equipment is in an RRC connected state, the RRC message indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode.
1. A communication control method used in a user equipment for performing a predetermined data transmission in which the user equipment transmits uplink user data in an RRC idle state, the communication control method comprising:
when the user equipment is in an RRC connected state, transmitting an RRC message to a base station, the RRC message indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode.
2. The communication control method according to claim 1 , further comprising:
after transmitting the RRC message, receiving from the base station, an RRC connection release message causing the user equipment to transition to the RRC idle state; and
in response to receiving the RRC connection release message, transitioning to the RRC idle mode, wherein
the RRC connection release message includes information indicating a NCC (next Hop Chaining Count) used for the predetermined data transmission.
3. The communication control method according to claim 2 , further comprising:
transmitting the uplink user data when the user equipment is in the RRC idle state by using an RRC Connection Resume Request message.
4. A user equipment that performs a predetermined data transmission in which the user equipment transmits uplink user data in an RRC idle state, the user equipment comprising a processor and a memory, wherein
the processor is configured to transmit an RRC message to a base station when the user equipment is in an RRC connected state, the RRC message indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode.
5. An apparatus for controlling a user equipment that performs a predetermined data transmission in which the user equipment transmits uplink user data in an RRC idle state, the apparatus comprising a processor and a memory, wherein
the processor is configured to transmit an RRC message to a base station when the user equipment is in an RRC connected state, the RRC message indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode.
6. A base station that communicates with a user equipment that performs a predetermined data transmission in which the user equipment transmits uplink user data in an RRC idle state, the base station comprising a processor and a memory, wherein
the processor is configured to receive an RRC message from the user equipment when the user equipment is in an RRC connected state, the RRC message indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode.