Method and apparatus for improving carrier aggregation in next-generation mobile communication system
Disclosed are a communication scheme and a system thereof for converging an IoT technology and a 5G communication system for supporting a high data transmission rate beyond that of a 4G system. The disclosure can be applied to intelligent services (for example, services related to a smart home, smart building, smart city, smart car, connected car, health care, digital education, retail business, security, and safety) based on 5G communication technology and IoT-related technology. Disclosed is a method of a user equipment (UE) in a wireless communication system. The method includes: receiving a message including secondary cell (SCell) configuration information from a base station; identifying whether a condition for transitioning the SCell to a dormant state is satisfied; and in case that the condition for transitioning the SCell to the dormant state is satisfied, releasing periodic transmission resources for the SCell configured in the UE.
1. A method performed by a terminal in a communication system, the method comprising:
receiving, from a base station, a radio resource control (RRC) message including configuration information associated with at least one bandwidth part (BWP) for a secondary cell (SCell);
receiving, from the base station, downlink control information (DCI) for performing a BWP switching of an active BWP for the SCell among the at least one BWP to a dormant BWP;
performing the BWP switching of the active BWP for the SCell to the dormant BWP based on the DCI; and
based on performing the BWP switching of the active BWP for the SCell to the dormant BWP:
clearing a configured uplink grant type 2 associated with the SCell; and
suspending a configured uplink grant type 1 associated with the SCell.
2. The method of claim 1 , further comprising:
clearing a configured downlink assignment associated with the SCell based on performing the BWP switching of the active BWP for the SCell to the dormant BWP.
3. The method of claim 2 ,
wherein a periodic uplink transmission resource associated with the configured uplink grant type 1 has been provided by the RRC message,
wherein a periodic uplink transmission resource associated with the configured uplink grant type 2 has been provided by first DCI, and
wherein a periodic downlink transmission resource associated with the configured downlink assignment has been provided by second DCI.
4. The method of claim 1 ,
wherein a physical downlink control channel (PDCCH) is not monitored on the dormant BWP.
5. The method of claim 1 ,
wherein data is not transmitted or received on the dormant BWP,
wherein a sounding reference signal (SRS) is not transmitted on the dormant BWP, and
wherein a physical uplink control channel (PUCCH) is not transmitted on the dormant BWP.
6. The method of claim 1 ,
wherein a random access procedure is not performed on the dormant BWP.
7. The method of claim 1 ,
wherein a periodic channel state information (CSI) for the dormant BWP is reported.
8. The method of claim 1 ,
wherein the SCell is not a special cell (SpCell) and the SCell is not configured with a PUCCH.
9. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller configured to:
receive, from a base station via the transceiver, a radio resource control (RRC) message including configuration information associated with at least one bandwidth part (BWP) for a secondary cell (SCell);
receive, from the base station via the transceiver, downlink control information (DCI) for performing a BWP switching of an active BWP for the SCell among the at least one BWP to a dormant BWP;
perform the BWP switching of the active BWP for the SCell to the dormant BWP based on the DCI; and
based on performing the BWP switching of the active BWP for the SCell to the dormant BWP:
clear a configured uplink grant type 2 associated with the SCell; and
suspend a configured uplink grant type 1 associated with the SCell.
10. The terminal of claim 9 , wherein the controller is further configured to:
clear a configured downlink assignment associated with the SCell based on performing the BWP switching of the active BWP for the SCell to the dormant BWP.
11. The terminal of claim 10 ,
wherein a periodic uplink transmission resource associated with the configured uplink grant type 1 has been provided by the RRC message,
wherein a periodic uplink transmission resource associated with the configured uplink grant type 2 has been provided by first DCI, and
wherein a periodic downlink transmission resource associated with the configured downlink assignment has been provided by second DCI.
12. The terminal of claim 9 ,
wherein a physical downlink control channel (PDCCH) is not monitored on the dormant BWP.
13. The terminal of claim 9 ,
wherein data is not transmitted or received on the dormant BWP,
wherein a sounding reference signal (SRS) is not transmitted on the dormant BWP, and
wherein a physical uplink control channel (PUCCH) is not transmitted on the dormant BWP.
14. The terminal of claim 9 ,
wherein a random access procedure is not performed on the dormant BWP.
15. The terminal of claim 9 ,
wherein a periodic channel state information (CSI) for the dormant BWP is reported.
16. The terminal of claim 9 ,
wherein the SCell is not a special cell (SpCell) and the SCell is not configured with a PUCCH.