Apparatus and method for idle mode uplink transmission in wireless communication system
The disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-generation (4G) communication system such as long term evolution (LTE). Embodiments of the disclosure provide a method and device for RRC idle mode uplink transmission. The method may include: receiving a parameter and resource configuration for RRC idle mode uplink transmission; and, transmitting, in a RRC idle mode, uplink data according to preconfigured at least one of a parameter or a resource. The method can improve system transmission efficiency and reduce user equipment power consumption.
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving configuration information associated with a preconfigured uplink resource (PUR) from a base station (BS);
identifying that the configuration information includes a parameter ImplicitReleaseAfter, while the UE is in a radio resource control (RRC) idle mode; and
if a number of consecutive occasions for the PUR have been skipped, releasing the configuration information associated with the PUR,
wherein the parameter ImplicitReleaseAfter indicates the number of consecutive occasions for the PUR that can be skipped before the releasing of the configuration information.
2. The method of claim 1 , wherein the receiving of the configuration information associated with the PUR comprises:
receiving the configuration information associated with the PUR in an RRC connected mode; and
storing the configuration information associated with the PUR when an RRC connection is released.
3. The method of claim 2 , wherein the receiving of the configuration information associated with the PUR comprises:
receiving at least one of a parameter or a resource configuration for an RRC idle mode uplink transmission via user equipment (UE) specific RRC signaling in the RRC connected mode.
4. The method of claim 3 , further comprising:
monitoring activation signaling in the RRC idle mode, the activation signaling being used to activate configured resources for the RRC idle mode uplink transmission; and
transmitting uplink data in the RRC idle mode on the activated configured resources.
5. The method of claim 2 , further comprising:
receiving a timing advance (TA) in the RRC connected mode; and
storing the TA when the RRC connection is released, for use in transmitting uplink data in the RRC idle mode.
6. The method of claim 1 , wherein the receiving of the configuration information associated with the PUR comprises:
requesting the PUR via a random access procedure.
7. The method of claim 6 , wherein the requesting of the PUR via the random access procedure comprises:
transmitting request information which is carried by a random access message 3; and
receiving the configuration information associated with the PUR which is carried by a random access message 4.
8. The method of claim 6 , wherein the requesting of the PUR via the random access procedure comprises:
transmitting request information which is carried by a random access message 3;
receiving the configuration information associated with the PUR which is carried by a random access message 4; and
receiving a resource configuration for the RRC idle mode which is carried by downlink control information (DCI) of a random access message 5.
9. The method of claim 6 , further comprising:
receiving information indicating that the BS refuses to pre-configure the PUR for the RRC idle mode, which is carried by a random access message 4.
10. The method of claim 6 , further comprising:
falling back to establish or resume an RRC connection, when the request is rejected during the random access procedure.
11. The method of claim 6 , further comprising:
receiving a TA for the RRC idle mode which is carried by a random access message 2; or
receiving a TA for the RRC idle mode which is carried by DCI.
12. The method of claim 1 , further comprising:
releasing a resource for the RRC idle mode.
13. The method of claim 1 , wherein the releasing of the configuration information associated with the PUR comprises one of:
releasing the configuration information associated with the PUR after a timing alignment timer for managing a timing advance (TA) expires; or
releasing the configuration information associated with the PUR after receiving release signaling from the BS.
14. The method of claim 1 , further comprising:
falling back to a random access procedure to establish or resume an RRC connection, after a predetermined number of transmissions on the RRC idle mode have failed.
15. The method of claim 1 , wherein the PUR is semi-statically configured.
16. A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
a controller coupled with the transceiver, and configured to:
receive configuration information associated with a preconfigured uplink resource (PUR), from a base station (BS),
identify that the configuration information includes a parameter ImplicitReleaseAfter, while the UE is in a radio resource control (RRC) idle mode, and
if a number of consecutive occasions for the PUR have been skipped, release the configuration information associated with the PUR,
wherein the parameter ImplicitReleaseAfter indicates the number of consecutive occasions for the PUR that can be skipped before the releasing of the configuration information.