# US 12,120,666 B2 · Cross-carrier scheduling across different DRX groups

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- Number: US 12,120,666 B2
- Document ID: US12120666B2
- Status: Granted
- Kind: B2
- Application number: 17/664,195
- Filed: 2022-05-19
- Published: 2022-12-08
- Granted: 2024-10-15
- Earliest claimed: 2021-06-02
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Ebrahim MolavianJazi; Qiongjie Lin; Aristides Papasakellariou
- Web page: https://patentgrep.com/patent/US12120666B2

## CPC

- H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

Apparatuses and methods for cross-carrier scheduling across different discontinuous reception (DRX) groups. A method includes receiving first information for a first and second sets of values for a first set of DRX timers associated with first and second DRX cell groups, respectively; receiving second information, from a first cell, for scheduling on a second cell; and receiving a physical downlink control channel (PDCCH) on the first cell. The first and second DRX cell groups do not have a common cell. The first and second cells are from the first and second DRX cell groups, respectively. The method further includes determining a first DRX Active time for the first DRX cell group based on the first set of values and the PDCCH reception and determining a second DRX Active time for the second DRX cell group based on the second set of values and the PDCCH reception.

## Claims

### Claim 1

A method comprising:
receiving:
first information for:
a first set of values for a first set of discontinuous reception (DRX) timers associated with a first DRX cell group, and
a second set of values for the first set of DRX timers associated with a second DRX cell group, wherein the first DRX cell group and the second DRX cell group do not have a common cell;
second information for scheduling, from a first cell, on a second cell, wherein:
the first cell is from the first DRX cell group, and
the second cell is from the second DRX cell group; and
a physical downlink control channel (PDCCH) on the first cell, wherein the PDCCH schedules a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) on the second cell;
receiving the PDSCH or transmitting the PUSCH on the second cell; and
determining:
a first DRX Active time for the first DRX cell group based on the first set of values and the PDCCH reception, and
a second DRX Active time for the second DRX cell group based on the second set of values and the PDCCH reception.

### Claim 2 (depends on 1)

The method of claim 1, wherein determining the first DRX Active time and the second DRX Active time comprises extending first DRX timers, from the first set of DRX timers, for the first DRX cell group and the second DRX cell group in response to the PDCCH reception.

### Claim 3 (depends on 1)

The method of claim 1, wherein determining the first DRX Active time and the second DRX Active time comprises:
starting or restarting:
a first drx-InactivityTimer on the first DRX cell group with a first value in a first symbol after an end of the PDCCH reception, and
a second drx-InactivityTimer on the second DRX cell group with a second value in the first symbol after the end of the PDCCH reception, wherein:
the PDSCH reception or the PUSCH transmission includes a new transport block,
the first value is from the first set of values, and
the second value is from the second set of values.

### Claim 4 (depends on 1)

The method of claim 1, wherein determining the first DRX Active time and the second DRX Active time comprises:
extending first DRX timers, from the first set of DRX timers, for the first DRX cell group in response to the PDCCH reception, and
maintaining the first DRX timers for the second DRX cell group in response to the PDCCH reception.

### Claim 5 (depends on 1)

The method of claim 1, wherein determining the first DRX Active time and the second DRX Active time comprises:
starting or restarting a first drx-InactivityTimer on the first DRX cell group with a first value in a first symbol after an end of the PDCCH reception,
maintaining a second drx-InactivityTimer on the second DRX cell group in the first symbol after the end of the PDCCH reception, wherein:
the PDSCH reception or the PUSCH transmission includes a new transport block, and
the first value is from the first set of values.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
identifying third information for a third value of a second DRX timer corresponding to the second cell, wherein the second DRX timer is not included in the first set of DRX timers; and
determining a third DRX Active time for the second cell based on one of:
the second DRX timer, or
the first set of DRX timers and the second DRX timer, wherein the third DRX Active time is different from the second DRX Active time.

### Claim 7 (depends on 6)

The method of claim 6, further comprising:
identifying fourth information for time units with values m1 and m2;
starting the second DRX timer m1 time units before a first symbol of the PDSCH reception or PUSCH transmission; and
stopping the second DRX timer m2 time units after a last symbol of the PDSCH reception or PUSCH transmission.

### Claim 8

A user equipment (UE) comprising:
a transceiver configured to:
receive first information for:
a first set of values for a first set of discontinuous reception (DRX) timers associated with a first DRX cell group, and
a second set of values for the first set of DRX timers associated with a second DRX cell group, wherein the first DRX cell group and the second DRX cell group do not have a common cell;
receive second information for scheduling, from a first cell, on a second cell, wherein:
the first cell is from the first DRX cell group, and
the second cell is from the second DRX cell group;
receive a physical downlink control channel (PDCCH) on the first cell, wherein the PDCCH schedules a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) on the second cell; and
receive the PDSCH or transmit the PUSCH on the second cell; and
a processor operably coupled to the transceiver, the processor configured to determine:
a first DRX Active time for the first DRX cell group based on the first set of values and the PDCCH reception, and
a second DRX Active time for the second DRX cell group based on the second set of values and the PDCCH reception.

### Claim 9 (depends on 8)

The UE of claim 8, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to extend first DRX timers, from the first set of DRX timers, for the first DRX cell group and the second DRX cell group in response to the PDCCH reception.

### Claim 10 (depends on 8)

The UE of claim 8, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to start or restart:
a first drx-InactivityTimer on the first DRX cell group with a first value in a first symbol after an end of the PDCCH reception, and
a second drx-InactivityTimer on the second DRX cell group with a second value in the first symbol after the end of the PDCCH reception, wherein:
the PDSCH reception or the PUSCH transmission includes a new transport block,
the first value is from the first set of values, and
the second value is from the second set of values.

### Claim 11 (depends on 8)

The UE of claim 8, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to:
extend first DRX timers, from the first set of DRX timers, for the first DRX cell group in response to the PDCCH reception, and
maintain the first DRX timers for the second DRX cell group in response to the PDCCH reception.

### Claim 12 (depends on 8)

The UE of claim 8, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to:
start or restart a first drx-InactivityTimer on the first DRX cell group with a first value in a first symbol after an end of the PDCCH reception,
maintain a second drx-InactivityTimer on the second DRX cell group in the first symbol after the end of the PDCCH reception, wherein:
the PDSCH reception or the PUSCH transmission includes a new transport block, and
the first value is from the first set of values.

### Claim 13 (depends on 8)

The UE of claim 8, wherein the processor is further configured to:
identify third information for a third value for a second DRX timer corresponding to the second cell, wherein the second DRX timer is not included in the first set of DRX timers, and
determine a third DRX Active time for the second cell based on one of:
the second DRX timer, or
the first set of DRX timers and the second DRX timer, wherein the third DRX Active time is different from the second DRX Active time.

### Claim 14 (depends on 13)

The UE of claim 13, wherein the processor is further configured to:
identify fourth information for time units with values m1 and m2,
start the second DRX timer m1 time units before a first symbol of the PDSCH reception or PUSCH transmission, and
stop the second DRX timer m2 time units after a last symbol of the PDSCH reception or PUSCH transmission.

### Claim 15

A base station comprising:
a transceiver configured to:
transmit first information for:
a first set of values for a first set of discontinuous reception (DRX) timers associated with a first DRX cell group, and
a second set of values for the first set of DRX timers associated with a second DRX cell group, wherein the first DRX cell group and the second DRX cell group do not have a common cell;
transmit second information for scheduling, from a first cell, on a second cell, wherein:
the first cell is from the first DRX cell group, and
the second cell is from the second DRX cell group;
transmit a physical downlink control channel (PDCCH) on the first cell, wherein the PDCCH schedules a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) on the second cell; and
transmit the PDSCH or receive the PUSCH on the second cell; and
a processor operably coupled to the transceiver, the processor configured to determine:
a first DRX Active time for the first DRX cell group based on the first set of values and the PDCCH transmission, and
a second DRX Active time for the second DRX cell group based on the second set of values and the PDCCH transmission.

### Claim 16 (depends on 15)

The base station of claim 15, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to extend first DRX timers, from the first set of DRX timers, for the first DRX cell group and the second DRX cell group in response to the PDCCH transmission.

### Claim 17 (depends on 15)

The base station of claim 15, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to start or restart:
a first drx-InactivityTimer on the first DRX cell group with a first value in a first symbol after an end of the PDCCH transmission, and
a second drx-InactivityTimer on the second DRX cell group with a second value in the first symbol after the end of the PDCCH transmission, wherein:
the PDSCH transmission or the PUSCH reception includes a new transport block,
the first value is from the first set of values, and
the second value is from the second set of values.

### Claim 18 (depends on 15)

The base station of claim 15, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to:
extend first DRX timers, from the first set of DRX timers, for the first DRX cell group in response to the PDCCH transmission, and
maintain the first DRX timers for the second DRX cell group in response to the PDCCH transmission.

### Claim 19 (depends on 15)

The base station of claim 15, wherein to determine the first DRX Active time and the second DRX Active time, the processor is further configured to:
start or restart a first drx-InactivityTimer on the first DRX cell group with a first value in a first symbol after an end of the PDCCH transmission,
maintain a second drx-InactivityTimer on the second DRX cell group in the first symbol after the end of the PDCCH transmission, wherein:
the PDSCH transmission or the PUSCH reception includes a new transport block, and
the first value is from the first set of values.

### Claim 20 (depends on 15)

The base station of claim 15, wherein the processor is further configured to determine:
third information for a third value for a second DRX timer corresponding to the second cell, wherein the second DRX timer is not included in the first set of DRX timers, and
a third DRX Active time for the second cell based on one of:
the second DRX timer, or
the first set of DRX timers and the second DRX timer, wherein the third DRX Active time is different from the second DRX Active time.