Method and apparatus of power saving for discontinuous reception
A method of power saving for a user equipment (UE) is provided. The method includes the following actions. A beam failure recovery configuration is received by a UE from a first base station. Whether a beam failure is detected by the UE. When the beam failure is detected during a discontinuous reception (DRX) off period, a beam recovery request is transmitted by the UE to the first base station when the UE transitions from the DRX off period to a DRX on period. A beam recovery response is received by the UE from the first base station.
1. A method of power saving for a user equipment (UE), comprising:
receiving a first indicator from a first base station during a first discontinuous reception (DRX) off-period that is configured for a first cell group, the first cell group being managed by the first base station;
determining, based on the first indicator, whether to stop monitoring at least one first downlink control channel of at least one first active cell of the first cell group during at least one first DRX on-period that is configured for the first cell group, the at least one first DRX on-period being subsequent to the first DRX off-period;
receiving a beam failure recovery configuration from the first base station;
determining whether a beam failure is detected;
when the beam failure is detected during the first DRX off-period:
transmitting a beam recovery request to the first base station when the UE transitions from the first DRX off-period to the at least one first DRX on-period, the beam recovery request being generated in response to a special cell coupled to the first base station; and
receiving a first beam recovery response including the first indicator from the first base station;
determining whether at least one secondary cell is configured to be active or inactive in response to the first indicator; and
transmitting a secondary beam recovery request corresponding to the at least one secondary cell to the first base station when the beam failure is detected on the at least one secondary cell and the at least one secondary cell is configured to be active.
2. A method for power saving of a base station, comprising:
configuring an active or inactive state of at least one secondary cell;
generating a first indicator in response to the active or inactive state of the at least one secondary cell, the first indicator indicating to a user equipment (UE) whether to stop monitoring at least one first downlink control channel of at least one first active cell of a first cell group during at least one first discontinuous reception (DRX) on-period that is configured for the first cell group, the at least one first DRX on-period being subsequent to a first DRX off-period;
transmitting the first indicator to the UE during the first DRX off-period that is configured for the first cell group, the first cell group being managed by the base station;
transmitting a beam failure recovery configuration to the UE;
receiving a beam recovery request from the UE when the UE transitions from the first DRX off-period to the at least one first DRX on-period, the beam recovery request being generated in response to the beam failure recovery configuration;
transmitting a beam recovery response including the first indicator to the UE; and
receiving a secondary beam recovery request corresponding to the at least one secondary cell when a beam failure is detected on the at least one secondary cell and the at least one secondary cell is configured to be active.
3. The method of claim 2 , wherein the beam failure recovery configuration is associated with a primary cell in a Master Cell Group (MCG) or a primary secondary cell in a Secondary Cell Group (SCG).
4. A user equipment (UE), comprising:
a processor configured to perform instructions for:
receiving a beam failure recovery configuration from a first base station;
determining whether a beam failure is detected;
when the beam failure is detected during a first discontinuous reception (DRX) off-period:
transmitting a beam recovery request to the first base station when the UE transitions from the first DRX off-period to at least one first DRX on-period, the beam recovery request being generated in response to a special cell coupled to the first base station; and
receiving a first beam recovery response including a first indicator from the first base station during the first DRX off-period that is configured for a first cell group, the first cell group being managed by the first base station;
determining, based on the first indicator, whether to stop monitoring at least one first downlink control channel of at least one first active cell of the first cell group during the at least one first DRX on-period that is configured for the first cell group, the at least one first DRX on-period being subsequent to the first DRX off-period;
determining whether at least one secondary cell is configured to be active or inactive in response to the first indicator; and
transmitting a secondary beam recovery request corresponding to the at least one secondary cell to the first base station when the beam failure is detected on the at least one secondary cell and the at least one secondary cell is configured to be active.
5. A base station, comprising:
a processor configured to perform instructions for:
configuring an active or inactive state of at least one secondary cell;
generating a first indicator in response to the active or inactive state of the at least one secondary cell;
transmitting a beam recovery response including the first indicator to a user equipment (UE);
transmitting a first indicator configuration to the UE during a first discontinuous reception (DRX) off-period that is configured for a first cell group, the first cell group being managed by the base station;
wherein the first indicator indicates the UE whether to stop monitoring at least one first downlink control channel of at least one first active cell of the first cell group during at least one first DRX on-period that is configured for the first cell group, the at least one first DRX on-period being subsequent to the first DRX off-period;
transmitting a beam failure recovery configuration to the UE;
receiving a beam recovery request from the UE when the UE transitions from the first DRX off-period to the at least one first DRX on-period, the beam recovery request being generated in response to the beam failure recovery configuration; and
receiving a secondary beam recovery request corresponding to the at least one secondary cell when a beam failure is detected on the at least one secondary cell configured to be active.
6. The base station of claim 5 , wherein the beam failure recovery configuration is associated with a primary cell in a Master Cell Group (MCG) or a primary secondary cell in a Secondary Cell Group (SCG).