Methods for data transmission and user equipment using the same
A method performed by a user equipment (UE) for data transmission is provided. The method includes transmitting, in radio resource control (RRC) inactive state, an RRC message to a base station for requesting an RRC state transition on an uplink (UL) resource of a configured grant (CG) configuration; transmitting first uplink data to the base station on an UL resource of the CG configuration; starting a timer upon transmitting on an UL resource of the CG configuration; and monitoring a response from the base station while the timer is running. The timer is configured to stop in response to at least one stop condition, and the at least one stop condition includes the response that responds to the RRC message for requesting the RRC state transition is received. In addition, a UE using the method is also provided.
1. A method performed by a User Equipment (UE) for data transmission, the method comprising:
transmitting a radio resource control (RRC) message to a base station for requesting an RRC state transition, the RRC message transmitted on a first uplink (UL) resource of a configured grant (CG) configuration;
transmitting first uplink data to the base station on a second UL resource of the CG configuration;
starting a timer upon transmitting the first uplink data on the second UL resource of the CG configuration;
monitoring a physical downlink control channel (PDCCH) for a response from the base station while the timer is running;
stopping the timer in response to at least one stop condition being satisfied; and
restarting the timer in response to at least one restart condition being satisfied,
wherein:
the at least one stop condition comprises receiving the response, and
the at least one restart condition comprises retransmitting the first uplink data on a physical uplink shared channel (PUSCH) scheduled by the PDCCH or transmitting second uplink data on a third UL resource of the CG configuration.
2. The method of claim 1 , further comprising, before transmitting the RRC message:
receiving an RRC release message comprising the CG configuration; and
transitioning from an RRC connected state to an RRC inactive state after receiving the RRC release message.
3. The method of claim 1 , wherein monitoring the PDCCH for the response from the base station while the timer is running comprises:
receiving information, via the PDCCH, scheduling a physical downlink shared channel (PDSCH); and
monitoring the PDSCH for receiving the response.
4. The method of claim 1 , wherein the at least one stop condition further comprises:
receiving an uplink grant via the PDCCH, the uplink grant indicating a new transmission.
5. The method of claim 1 , wherein the response comprises at least one of an RRC resume message, an RRC release message, an RRC setup message, or an RRC reject message.
6. The method of claim 1 , wherein the RRC message for requesting the RRC state transition comprises an RRC resume request message.
7. The method of claim 1 , further comprising:
determining that the transmission of the first uplink data on the second UL resource of the CG configuration corresponding to the timer has failed in a case that the timer expires.
8. A User Equipment (UE), comprising:
at least one processor; and
at least one non-transitory computer-readable medium storing one or more computer-executable instructions that, when executed by the at least one processor, cause the UE to:
transmit a radio resource control (RRC) message to a base station for requesting an RRC state transition, the RRC message transmitted on a first uplink (UL) resource of a configured grant (CG) configuration;
transmit first uplink data to the base station on a second UL resource of the CG configuration;
start a timer upon transmitting the first uplink data on the second UL resource of the CG configuration;
monitor a physical downlink control channel (PDCCH) for a response from the base station while the timer is running;
stop the timer in response to at least one stop condition being satisfied; and
restart the timer in response to at least one restart condition being satisfied,
wherein:
the at least one stop condition comprises receiving the response, and
the at least one restart condition comprises retransmitting the first uplink data on a physical uplink shared channel (PUSCH) scheduled by the PDCCH or transmitting second uplink data on a third UL resource of the CG configuration.
9. The UE of claim 8 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the UE to, before transmitting the RRC message:
receive an RRC release message comprising the CG configuration; and
transition from an RRC connected state to an RRC inactive state after receiving the RRC release message.
10. The UE of claim 8 , wherein monitoring the PDCCH for the response from the base station while the timer is running comprises:
receiving information, via the PDCCH, scheduling a physical downlink shared channel (PDSCH); and
monitoring the PDSCH for receiving the response.
11. The UE of claim 8 , wherein the at least one stop condition further comprises:
receiving an uplink grant via the PDCCH, the uplink grant indicating a new transmission.
12. The UE of claim 8 , wherein the response comprises at least one of an RRC resume message, an RRC release message, an RRC setup message, or an RRC reject message.
13. The UE of claim 8 , wherein the RRC message for requesting the RRC state transition comprises an RRC resume request message.
14. The UE of claim 8 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the UE to:
determine that the transmission of the first uplink data on the second UL resource of the CG configuration corresponding to the timer has failed in a case that the timer expires.