Method of user equipment power savings using groups of cells, and network node thereof

1. A method, comprising:

conducting, by at least one processor of a user equipment (UE), communications with a first group of cells;

receiving, by the at least one processor, a first indicator, the first indicator notifying the UE to enable scheduling with at least one second group of cells;

starting, by the at least one processor, a first inactivity timer associated with the at least one second group of cells based on the first indicator, the first inactivity timer being a shorter duration than a second inactivity timer associated with the at least one group of cells; and

scheduling, by the at least one processor, communications with the at least one second group of cells following the starting of the first inactivity timer,

wherein

the first group of cells is a primary discontinuous reception (P-DRX) group of cells, and

the at least one second group of cells is a secondary discontinuous reception (S-DRX) group of cells,

wherein the scheduling of communications includes,

sending a command to one of more cells, of the at least one second group of cells, to cause the one or more cells to switch from dormant to non-dormant,

the method further comprising:

configuring the UE with DRX mode operation, via the primary group of cells or the secondary group of cells;

setting a location in a DCI format of a wake-up indication bit in a first position, where:

the UE a does not start a DRXOnDuration timer for a next long DRX cycle when a value of a ‘physical downlink control channel (PDCCH) monitoring’ bit is ‘0’, and

the UE a starts the DRXOnDuration for a next long DRX cycle when a value of the ‘PDCCH monitoring’ bit is ‘1’.

2. The method of claim 1 , wherein

a bitmap when the UE is provided a number of groups of configured secondary cells by secondary cell-groups-for-dormancy-outside-active-time occurs when:

a bitmap location is immediately after the ‘PDCCH monitoring’ bit location,

the bitmap size is equal to the number of groups of configured secondary cells where each bit of the bitmap corresponds to a group of configured secondary cells from the number of groups of configured secondary cells,

a ‘0’ value for a bit of the bitmap indicates an active downlink bandwidth part (BWP), provided by a dormant BWP, for the UE for each activated secondary cell in the corresponding group of configured secondary cells, and

a ‘1’ value for a bit of the bitmap indicates an active downlink BWP, provided by first-non-dormant-BWP-ID-for-DCI-outside-active-time, for the UE for each activated secondary cell in the corresponding group of configured secondary cells.

3. The method of claim 2 , wherein the P-DRX group of cells transmits using a lower frequency range relative to the S-DRX group of cells.

4. The method of claim 2 , wherein

the S-DRX group includes a first physical downlink control channel (PDCCH) monitoring scheme with a first repeating discontinuous reception (DRX) cycle, the first repeating DRX cycle including a first uplink/downlink traffic period and a first OnDuration period,

the P-DRX group includes a second physical downlink control channel (PDCCH) monitoring scheme with a second repeating discontinuous reception (DRX) cycle, the second repeating DRX cycle including a second uplink/downlink traffic period and a second OnDuration period, and

the first downlink period and the first OnDuration period is shorter than the second downlink period and the second OnDuration period, respectively.

5. The method of claim 4 , wherein a first length of the first repeating DRX cycle is the same as a second length of the second repeating DRX cycle.

6. The method of claim 2 , wherein the scheduling of the communications includes,

activating one or more cells of the at least one second group of cells.

7. The method of claim 2 , wherein the scheduling of communications includes,

sending a command to one of more cells, of the at least one second group of cells, to cause the one or more cells to switch from dormant to non-dormant.

8. The method of claim 1 , wherein the first inactivity timer is a DRX-inactivity timer for a discontinuous reception (DRX) cycle of the S-DRX group of cells.

9. The method of claim 8 , further comprising:

receiving a second indicator, the second indicator indicating that the at least one second group of cells is dormant; and

stopping the first inactivity timer and a DRX OnDuration timer, based on the receiving of the second indicator.

10. The method of claim 8 , further comprising:

receiving a second indicator, the second indicator indicating that the at least one second group of cells is dormant; and

ensuring that a DRX OnDuration timer is not started, based on the receiving of the second indicator.

11. The method of claim 1 , wherein the first group of cells transmits at a lower frequency range relative to the at least one second group of cells.

12. A user equipment, comprising:

a memory containing computer-readable instructions; and

at least one processor configured to read and execute the computer-readable instructions, in order to,

conduct communications with a first group of cells,

receive a first indicator, the first indicator notifying the network node to enable scheduling with at least one second group of cells,

start a first inactivity timer associated with the at least one second group of cells based on the first indicator, the first inactivity timer being a shorter duration than a second inactivity timer associated with the at least one group of cells, and

schedule communications with the at least one second group of cells following the starting of the first inactivity timer,

wherein

the first group of cells is a primary discontinuous reception (P-DRX) group of cells, and

the at least one second group of cells is a secondary discontinuous reception (S-DRX) group of cells,

wherein the scheduling of communications includes,

sending a command to one of more cells, of the at least one second group of cells to cause the one or more cells to switch from dormant to non-dormant,

the at least one processor further configured to read and execute the computer-readable instructions, in order to:

configure the UE with DRX mode operation, via the primary group of cells or the secondary group of cells;

set a location in a DCI format of a wake-up indication bit in a first position, where:

the UE a does not start a DRXOnDuration timer for a next long DRX cycle when a value of a ‘physical downlink control channel (PDCCH) monitoring’ bit is ‘0’, and

the UE a starts the DRXOnDuration for a next long DRX cycle when a value of the ‘PDCCH monitoring’ bit is ‘1’.

13. The user equipment of claim 12 , wherein

a bitmap when the UE is provided a number of groups of configured secondary cells by secondary cell-groups-for-dormancy-outside-active-time occurs when:

a bitmap location is immediately after the ‘PDCCH monitoring’ bit location,

the bitmap size is equal to the number of groups of configured secondary cells where each bit of the bitmap corresponds to a group of configured secondary cells from the number of groups of configured secondary cells,

a ‘0’ value for a bit of the bitmap indicates an active downlink bandwidth part (BWP), provided by a dormant BWP, for the UE for each activated secondary cell in the corresponding group of configured secondary cells, and

a ‘1’ value for a bit of the bitmap indicates an active downlink BWP, provided by first-non-dormant-BWP-ID-for-DCI-outside-active-time, for the UE for each activated secondary cell in the corresponding group of configured secondary cells.

14. The user equipment of claim 13 , wherein the P-DRX group of cells transmits using a lower frequency range relative to the S-DRX group of cells.

15. The user equipment of claim 13 , wherein

the S-DRX group includes a first physical downlink control channel (PDCCH) monitoring scheme with a first repeating discontinuous reception (DRX) cycle, the first repeating DRX cycle including a first uplink/downlink traffic period and a first OnDuration period,

the P-DRX group includes a second physical downlink control channel (PDCCH) monitoring scheme with a second repeating discontinuous reception (DRX) cycle, the second repeating DRX cycle including a second uplink/downlink traffic period and a second OnDuration period, and

the first downlink period and the first OnDuration period is shorter than the second downlink period and the second OnDuration period, respectively.

16. The user equipment of claim 15 , wherein a first length of the first repeating DRX cycle is the same as a second length of the second repeating DRX cycle.

17. The user equipment of claim 13 , wherein the at least one processor is further configured to schedule the communications by,

activating one or more cells of the at least one second group of cells.

18. The user equipment of claim 13 , wherein the at least one processor is further configured to schedule the communications by,

sending a command to one of more cells, of the at least one second group of cells, to cause the one or more cells to switch from dormant to non-dormant.

19. The user equipment of claim 12 , wherein the first inactivity timer is a DRX-inactivity timer for a discontinuous reception (DRX) cycle of the S-DRX group of cells.

20. The user equipment of claim 19 , wherein the at least one processor is further configured to:

receive a second indicator, the second indicator indicating that the at least one second group of cells is dormant, and

stop the first inactivity timer and a DRX OnDuration timer, based on the receiving of the second indicator.

21. The user equipment of claim 19 , wherein the at least one processor is further configured to:

receive a second indicator, the second indicator indicating that the at least one second group of cells is dormant, and

ensure that a DRX OnDuration timer is not started, based on the receiving of the second indicator.

22. The user equipment of claim 12 , wherein the first group of cells transmits at a lower frequency range relative to the at least one second group of cells.