Discontinuous reception operations among multiple bandwidth parts
A method for a DRX operation is provided. The method includes receiving a first DCI indicating a first location in a first BWP for receiving DL data corresponding to a HARQ process and a second location in a second BWP for transmitting a HARQ feedback corresponding to reception of the DL data; receiving the DL data at the first location; transmitting the HARQ feedback at the second location; starting a first timer in a first symbol of the first BWP immediately after the HARQ feedback to indicate a first time period during which monitoring a PDCCH for the HARQ process is not required; and starting a second timer in a first symbol of the first BWP immediately after expiration of the first timer to indicate a second time period during which monitoring the PDCCH for receiving a second DCI indicating a retransmission of the DL data is required.
1. A method for a discontinuous reception (DRX) operation performed by a user equipment (UE), the method comprising:
receiving first downlink control information (DCI) indicating a first location in a first bandwidth part (BWP) for receiving downlink (DL) data corresponding to a hybrid automatic repeat request (HARQ) process and a second location in a second BWP for transmitting a HARQ feedback corresponding to reception of the DL data;
receiving the DL data at the first location of the first BWP;
transmitting the HARQ feedback at the second location of the second BWP;
starting a first timer in a symbol of the first BWP that is immediately after the HARQ feedback, the first timer indicating a first time period during which the UE is not required to monitor a physical downlink control channel (PDCCH) for the HARQ process; and
starting a second timer in another symbol of the first BWP that is immediately after expiration of the first timer, the second timer indicating a second time period during which the UE is required to monitor the PDCCH for receiving second DCI indicating a retransmission of the DL data.
2. The method of claim 1 , wherein the first time period is represented in a number of symbols of the first BWP.
3. The method of claim 1 , wherein the second time period is represented in a number of slots of the first BWP.
4. The method of claim 1 , wherein the first timer is a downlink DRX HARQ round-trip time timer (drx-HARQ-RTT-TimerDL) and the second timer is a downlink DRX retransmission time timer (drx-RetransmissionTimerDL).
5. The method of claim 1 , wherein the first BWP comprises a DL BWP and the second BWP comprises a UL BWP.
6. The method of claim 1 , wherein receiving the first DCI comprises receiving the first DCI in a third BWP different from the first and second BWPs.
7. The method of claim 1 , wherein receiving the first DCI comprises receiving the first DCI in the first BWP.
8. A user equipment (UE), comprising:
one or more non-transitory computer-readable media storing one or more computer-executable instructions for performing a discontinuous reception (DRX) operation; and
at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the one or more computer-executable instructions to:
receive first downlink control information (DCI) indicating a first location in a first bandwidth part (BWP) for receiving downlink (DL) data corresponding to a hybrid automatic repeat request (HARQ) process and a second location in a second BWP for transmitting a HARQ feedback corresponding to reception of the DL data;
receive the DL data at the first location of the first BWP;
transmit the HARQ feedback at the second location of the second BWP;
start a first timer in a symbol of the first BWP that is immediately after the HARQ feedback, the first timer indicating a first time period during which the UE is not required to monitor a physical downlink control channel (PDCCH) for the HARQ process; and
start a second timer in another symbol of the first BWP that is immediately after expiration of the first timer, the second timer indicating a second time period during which the UE is required to monitor the PDCCH for receiving second DCI indicating a retransmission of the DL data.
9. The UE of claim 8 , wherein the first time period is represented in a number of symbols of the first BWP.
10. The UE of claim 8 , wherein the second time period is represented in a number of slots of the first BWP.
11. The UE of claim 8 , wherein the first timer is a downlink DRX HARQ round-trip time timer (drx-HARQ-RTT-TimerDL) and the second timer is a downlink DRX retransmission time timer (drx-RetransmissionTimerDL).
12. The UE of claim 8 , wherein the first BWP comprises a DL BWP and the second BWP comprises a UL BWP.
13. The UE of claim 8 , wherein receiving the first DCI comprises receiving the first DCI in a third BWP different from the first and second BWPs.
14. The UE of claim 8 , wherein receiving the first DCI comprises receiving the first DCI in the first BWP.