Method and apparatus for power savings at a user equipment

Patent metadata

Field	Value
Publication number	US-11297674-B2
Application number	US-201916268300-A
Country	US
Kind code	B2
Filing date	Feb 5, 2019
Priority date	Feb 14, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A method for a user equipment (UE) apparatus to reduce power consumption in response to an outcome of a signal reception. The outcome can indicate whether or not the UE needs to be active at a next discontinuous reception (DRX) cycle. The signal can also provide configurations of parameters for transmissions or receptions during the next DRX cycle and be used by the UE for measurements and to obtain channel state information.

First claim

What is claimed is:

1. A user equipment (UE) comprising:
a transceiver configured to:
receive first information for which secondary cells (SCells) are included in respective groups of first groups of SCells, and
receive first PDCCHs, wherein:
a first PDCCH from the first PDCCHs provides a first downlink control information (DCI) format,
the reception of the first PDCCH is outside an On-duration of any discontinuous reception (DRX) cycle,
the first DCI format includes a first bitmap, and
bits of the first bitmap have a one-to-one mapping with the first groups of SCells; and

a processor operably coupled to the transceiver, the processor configured to:
determine, based on a value of a corresponding bit of the first bitmap, whether or not to instruct the transceiver to receive PDCCHs for scheduling, on SCells in a group of SCells from the first groups of SCells, receptions of physical downlink shared channels (PDSCHs) or transmissions of physical uplink shared channels (PUSCHs); and
determine whether or not to instruct the transceiver to receive PDCCHs, for scheduling receptions of PDSCHs or transmission of PUSCHs, on a primary cell during the On-duration of a next DRX cycle based on a value of a first bit, wherein:
the first bit is included in the first DCI format, and
the first bit is not included in the first bitmap.

2. The UE of claim 1 , wherein:
the transceiver is further configured to receive a configuration for a first bandwidth part (BWP) of a cell from the group of SCells,
when the UE receives PDCCHs in a BWP of the cell, for scheduling receptions of PDSCHs or transmission of PUSCHs, prior to receiving the first DCI format and the value of the corresponding bit indicates to receive PDCCHs, for scheduling receptions of PDSCHs or transmission of PUSCHs, on the cell, the UE receives the PDCCHs in the BWP of the cell, and
when the UE does not receive PDCCHs in any BWP of the cell, for scheduling receptions of PDSCHs or transmissions of PUSCHs, prior to receiving the first DCI format and the value of the corresponding bit indicates to receive PDCCHs, for scheduling receptions of PDSCHs or transmissions of PUSCHs, on the cell, the UE receives the PDCCHs in the first BWP of the cell.

3. The UE of claim 1 , wherein:
the transceiver is further configured to receive second information; and
the processor is further configured to:
determine that the first DCI format is not received before a start of the On-duration of a next DRX cycle, and
determine whether or not to receive PDCCHs for scheduling receptions of PDSCHs, or transmissions of PUSCHs, on a primary cell during the On-duration of the next DRX cycle based on the second information.

4. The UE of claim 1 , wherein the reception of the first PDCCH is on a bandwidth part (BWP) that is same as a BWP at an end of the On-duration of a last DRX cycle for receptions of PDCCHs, for scheduling receptions of PDSCHs or transmissions of PUSCHs, were received on the primary cell.

5. The UE of claim 1 , wherein:
the transceiver is further configured to:
receive second information for second groups of SCells; and
receive a second PDCCH,

the second PDCCH provides a second DCI format,
the second DCI format includes a resource allocation field,
the processor is further configured to determine the second DCI format as:
scheduling a reception of a PDSCH when the resource allocation field does not have a first value; and
providing a second bitmap when the resource allocation field has the first value, bits of the second bitmap have a one-to-one mapping with the second groups of SCells,

the second bitmap is provided by fields in the second DCI format other than the resource allocation field, and
a value of a bit of the second bitmap indicates whether or not to receive PDCCHs, for scheduling receptions of PDSCHs or transmissions of PUSCHs, on a corresponding group of SCells from the second groups of SCells.

6. The UE of claim 1 , wherein:
the transceiver is further configured to:
receive second information for second groups of SCells; and
receive a second PDCCH on a cell,

the second PDCCH provides a second DCI format,
the second DCI format schedules a PDSCH reception or a PUSCH transmission on the cell,
the second DCI format includes a field that provides a second bitmap,
bits of the second bitmap have a one-to-one mapping with the second groups of SCells, and
the processor is further configured to determine whether or not to instruct the transceiver to receive PDCCHs, for scheduling receptions of PDSCHs or transmissions of PUSCHs, on SCells in a group of SCells from the second groups of SCells based on a value of a corresponding bit of the second bitmap.

7. A method for a user equipment (UE) to receive physical downlink control channels (PDCCHs), the method comprising:
receiving first information for which secondary cells (SCells) are included in respective groups of first groups of SCells;
receiving first PDCCHs, wherein:
a first PDCCH from the first PDCCHs provides a first downlink control information (DCI) format,
the reception of the first PDCCH is outside an On-duration of any discontinuous reception (DRX) cycle,
the first DCI format includes a first bitmap, and
bits of the first bitmap have a one-to-one mapping with the first groups of SCells;

determining, based on a value of a corresponding bit of the first bitmap, whether or not to receive PDCCHs for scheduling, on SCells in a group of SCells from the first groups of SCells, receptions of physical downlink shared channels (PDSCHs) or transmissions of physical uplink shared channels (PUSCHs); and
determining whether or not to receive PDCCHs, for scheduling receptions of PDSCHs or transmissions of PUSCHs, on a primary cell during the On-duration of a next DRX cycle based on a value of a first bit, wherein:
the first bit is included in the first DCI format, and
the first bit is not included in the first bitmap.

8. The method of claim 7 , further comprising:
receiving a configuration for a first bandwidth part (BWP) for a cell from the group of SCells, wherein:
when the UE does not receive PDCCHs in any BWP of the cell, for scheduling receptions of PDSCHs or transmissions of PUSCHs, prior to receiving the first DCI format and the value of the corresponding bit indicates to receive PDCCHs, for scheduling receptions of PDSCHs or transmissions of PUSCHs, on the cell, the UE receives the PDCCHs in the first BWP of the cell; and
when the UE receives PDCCHs in a BWP of the cell, for scheduling receptions of PDSCHs or transmissions of PUSCHs, prior to receiving the first DCI format and the value of the corresponding bit indicates to receive PDCCHs, for scheduling receptions of PDCCHs or transmissions of PUSCHs, on the cell, the UE receives the PDCCHs in the BWP of the cell.

9. The method of claim 7 , wherein the reception of the first PDCCH is on a bandwidth part (BWP) that is same as a BWP at an end of the On-duration of a last DRX cycle for receptions of PDCCHs, for scheduling receptions of PDSCHs or transmissions of PUSCHs, on the primary cell.

10. The method of claim 7 , further comprising:
receiving second information;
determining that the first DCI format is not received before a start of the On-duration of a next DRX cycle; and
determining whether or not to receive PDCCHs for scheduling receptions of PDSCHs or transmissions of PUSCHs, on a primary cell during the On-duration of the next DRX cycle based on the second information.

11. The method of claim 7 , further comprising:
receiving second information for second groups of SCells;
receiving a second PDCCH, wherein:
the second PDCCH provides a second DCI format, and
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Assignees

• Samsung Electronics Co Ltd

Inventors

• He Chao
• Papasakellariou Aris

Classifications

• H04W4/70

  Services for machine-to-machine communication [M2M] or machine type communication [MTC] · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04W72/1273

  of downlink data flows · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title