# US 12,193,104 B2 · Method and apparatus for power savings at a user equipment

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- Number: US 12,193,104 B2
- Document ID: US12193104B2
- Status: Granted
- Kind: B2
- Application number: 17/654,228
- Filed: 2022-03-09
- Published: 2022-06-30
- Granted: 2025-01-07
- Earliest claimed: 2018-02-14
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Chao He; Aris Papasakellariou
- Web page: https://patentgrep.com/patent/US12193104B2

## CPC

- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 52/0235: {where the received signal is a power saving command}
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 76/15: Setup of multiple wireless link connections
- Y02D 30/70: in wireless communication networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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

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.

## Claims

### Claim 1

A method for a user equipment (UE) to receive first physical downlink control channels (PDCCHs), the method comprising:
receiving:
information for groups of secondary cells (SCells) and for indexes of SCells in each group of SCells from the groups of SCells,
information for a search space set for receptions of second PDCCHs on a primary cell, outside an On-duration of any discontinuous reception (DRX) cycle on the primary cell, according to a common search space,
information for a time offset, and
the second PDCCHs starting from the time offset before a start of On-duration for a next DRX cycle, wherein a PDCCH from the second PDCCHs provides a first downlink control information (DCI) format and wherein:
the first DCI format does not schedule transmission or reception of a channel that provides data information,
the first DCI format includes a bitmap, and
bits of the bitmap have a one-to-one mapping with the groups of SCells; and
determining, based on a value of a bit of the bitmap, whether or not to receive the first PDCCHs, wherein:
the bit of the bitmap maps to a group of SCells from the groups of SCells, and
the first PDCCHs provide DCI formats that schedule receptions of physical downlink shared channels (PDSCHs) or transmissions of physical uplink shared channels (PUSCHs), on an SCell in the group of SCells.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first DCI format does not schedule reception of a PDSCH or transmission of a PUSCH.

### Claim 3 (depends on 1)

The method of claim 1, wherein the PDCCH reception is on a primary cell.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
determining to receive the first PDCCHs; and
receiving:
information, by higher layer signaling, for a downlink bandwidth part (BWP) of the SCell,
the first PDCCHs, and
a PDSCH on the downlink BWP of the SCell.

### Claim 5 (depends on 1)

The method of claim 1, wherein:
the bit of the bitmap indicates a dormant state or a non-dormant state for the SCell, and
an active bandwidth part (BWP) of the SCell is a dormant BWP or a non-dormant BWP.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
receiving information for:
a first radio network temporary identifier (RNTI) that scrambles cyclic redundancy check (CRC) bits of the first DCI format, and
a second RNTI that scrambles CRC bits of the DCI formats that schedule the receptions of the PDSCHs or the transmissions of the PUSCHs.

### Claim 7

A user equipment (UE) comprising:
a transceiver configured to receive:
information for groups of secondary cells (SCells) and for indexes of SCells in each group of SCells from the groups of SCells,
information for a search space set for receptions of second physical downlink control channels (PDCCHs) on a primary cell, outside an On-duration of any discontinuous reception (DRX) cycle on the primary cell, according to a common search space,
information for a time offset, and
the second PDCCHs starting from the time offset before a start of On-duration for a next DRX cycle, wherein a PDCCH from the second PDCCHs that provides a first downlink control information (DCI) format and wherein:
the first DCI format does not schedule transmission or reception of a channel that provides data information,
the first DCI format includes a bitmap, and
bits of the bitmap have a one-to-one mapping with the groups of SCells; and
a processor operably coupled to the transceiver, the processor configured to determine, based on a value of a bit of the bitmap, to instruct the transceiver whether or not to receive first PDCCHs, wherein:
the bit of the bitmap maps to a group of SCells from the groups of SCells, and
the first PDCCHs provide DCI formats that schedule receptions of physical downlink shared channels (PDSCHs) or transmissions of physical uplink shared channels (PUSCHs), on an SCell in the group of SCells.

### Claim 8 (depends on 7)

The UE of claim 7, wherein the first DCI format does not schedule reception of a PDSCH or transmission of a PUSCH.

### Claim 9 (depends on 7)

The UE of claim 7, wherein the PDCCH reception is on a primary cell.

### Claim 10 (depends on 7)

The UE of claim 7, wherein:
the processor is further configured to instruct the transceiver to receive the first PDCCHs; and
the transceiver is further configured to receive:
information, by higher layer signaling, for a downlink bandwidth part (BWP) of the SCell,
the first PDCCHs, and
a PDSCH on the downlink BWP of the SCell.

### Claim 11 (depends on 7)

The UE of claim 7, wherein:
the bit of the bitmap indicates a dormant state or a non-dormant state for the SCell, and
an active bandwidth part (BWP) of the SCell is a dormant BWP or a non-dormant BWP.

### Claim 12 (depends on 7)

The UE of claim 7, wherein:
the transceiver is further configured to receive information for:
a first radio network temporary identifier (RNTI) that scrambles cyclic redundancy check (CRC) bits of the first DCI format, and
a second RNTI that scrambles CRC bits of the DCI formats that schedule the receptions of the PDSCHs or the transmission of the PUSCHs.

### Claim 13

A base station comprising:
a transceiver configured to transmit:
information for groups of secondary cells (SCells) and for indexes of SCells in each group of SCells from the groups of SCells,
information for a search space set for receptions of second physical downlink control channels (PDCCHs) on a primary cell, outside an On-duration of any discontinuous reception (DRX) cycle on the primary cell, according to a common search space,
information for a time offset, and
the second PDCCHs starting from the time offset before a start of On-duration for a next DRX cycle, wherein a PDCCH from the second PDCCHs provides a first downlink control information (DCI) format and wherein:
the first DCI format does not schedule transmission or reception of a channel that provides data information,
the first DCI format includes a bitmap, and
bits of the bitmap have a one-to-one mapping with the groups of SCells;
a processor operably coupled to the transceiver, the processor configured to determine, based on a value of a bit of the bitmap, to instruct the transceiver whether or not to transmit first PDCCHs, wherein:
the bit of the bitmap maps to a group of SCells from the groups of SCells, and
the first PDCCHs provide DCI formats that schedule transmissions of physical downlink shared channels (PDSCHs) or receptions of physical uplink shared channels (PUSCHs), on an SCell in the group of SCells.

### Claim 14 (depends on 13)

The base station of claim 13, wherein the first DCI format does not schedule transmission of a PDSCH or reception of a PUSCH.

### Claim 15 (depends on 13)

The base station of claim 13, wherein the PDCCH transmission is on a primary cell.

### Claim 16 (depends on 13)

The base station of claim 13, wherein:
the processor is further configured to instruct the transceiver to transmit the first PDCCHs; and
the transceiver is further configured to transmit:
information, by higher layer signaling, for a downlink bandwidth part (BWP) of the SCell,
the first PDCCHs, and
a PDSCH on the downlink BWP of the SCell.

### Claim 17 (depends on 13)

The base station of claim 13, wherein:
the bit of the bitmap indicates a dormant state or a non-dormant state for the SCell, and
an active bandwidth part (BWP) of the SCell is a dormant BWP or a non-dormant BWP, respectively.