Method and apparatus for activating and reactivating SCell considering currently activated bandwidth part and bandwidth part configuration information in next-generation mobile communication system
The present disclosure relates to a communication method and system for converging a 5 th -Generation (5G) communication system for supporting higher data rates beyond a 4 th -Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of introducing a new dormant bandwidth part (BWP) and operating the dormant BWP in units of BWPs (bandwidth part-level) is provided.
1. A method performed by a terminal in a wireless communication system, the method comprises:
receiving a medium access control (MAC) control element (CE) for a secondary cell (SCell) activation or a deactivation;
identifying whether the SCell is deactivated prior to receiving the MAC CE; and
as a response to the SCell being deactivated prior to receiving the MAC CE: identifying whether a first active downlink bandwidth part (BWP) identifier (ID) for the SCell is set to a dormant BWP; in case that the first active downlink BWP ID for the SCell is not set to the dormant BWP, performing to activate the SCell based on the MAC CE; and in case that the first active downlink BWP ID for the SCell is set to the dormant BWP, stopping a BWP inactive timer.
2. The method of claim 1 , further comprising:
identifying whether an active downlink (DL) BWP is the dormant BWP; and
in case that the active DL BWP is not the dormant BWP, initializing a suspended configured uplink grant of a configured grant Type 1 associated with the SCell.
3. The method of claim 2 , further comprising:
in case that the active DL BWP is not the dormant BWP, triggering a power headroom report (PHR).
4. The method of claim 1 , further comprising:
performing at least one normal SCell operation for the activated SCell.
5. The method of claim 4 , wherein the at least one normal SCell operation comprises:
sounding reference signal (SRS) transmissions on the SCell, a channel state information (CSI) reporting for the SCell,
a physical downlink control channel (PDCCH) monitoring on the SCell,
the PDCCH monitoring for the SCell, and
physical uplink control channel (PUCCH) transmissions on the SCell if configured.
6. A terminal in a wireless communication system, the terminal comprises:
a transceiver; and
at least one processor configured to:
receive, via the transceiver, a medium access control (MAC) control element (CE) for a secondary cell (SCell) activation or a deactivation,
identify whether the SCell is deactivated prior to receiving the MAC CE, and
as a response to the SCell being deactivated prior to receiving the MAC CE: identify whether a first active downlink bandwidth part (BWP) identifier (ID) for the SCell is set to a dormant BWP, in case that the first active downlink BWP ID for the SCell is not set to the dormant BWP, perform to activate the SCell based on the MAC CE, and in case that the first active downlink BWP ID for the SCell is set to the dormant BWP, stop a BWP inactive timer.
7. The terminal of claim 6 , wherein the at least one processor is further configured to:
identify whether an active downlink (DL) BWP is the dormant BWP, and
in case that the active DL BWP is not the dormant BWP, initialize a suspended configured uplink grant of a configured grant Type 1 associated with the SCell.
8. The terminal of claim 7 , wherein the at least one processor is further configured to:
in case that the active DL BWP is not the dormant BWP, trigger a power headroom report (PHR).
9. The terminal of claim 6 , wherein the at least one processor is further configured to:
perform at least one normal SCell operation for the activated SCell.
10. The terminal of claim 9 , wherein the at least one normal SCell operation comprises:
sounding reference signal (SRS) transmissions on the SCell,
a channel state information (CSI) reporting for the SCell,
a physical downlink control channel (PDCCH) monitoring on the SCell,
the PDCCH monitoring for the SCell, and
physical uplink control channel (PUCCH) transmissions on the SCell if configured.