Granted Patent B2

US 12,563,498 · App. 18/352,714 · Granted Feb 24, 2026

Inventors: Jie Cui (San Jose, CA); Yang Tang (San Jose, CA); Qiming Li (Beijing, CN); Manasa Raghavan (Sunnyvale, CA); Xiang Chen (Campbell, CA); Hong He (San Jose, CA); Yuexia Song (Beijing, CN); Rolando E. Bettancourt Ortega (Munich, DE); Dawei Zhang (Saratoga, CA)

Assignee: APPLE INC.

H04W52/0235H04W68/02

Abstract

Claims (78)

1 . A user equipment (UE) comprising:

a low power wake up radio (LP-WUR) and a main radio configured to enable wireless communications with a base station; and

a processor, communicatively coupled to the LP-WUR and the main radio, and configured to:

receive, using the main radio, a legacy reference signal at a first frequency point;

receive, using the LP-WUR, a first low power wake up signal (LP-WUS) from the base station at the first frequency point with a periodicity, wherein the periodicity is:

greater than or equal to a discontinuous reception (DRX) cycle,

greater than or equal to an extended discontinuous reception (eDRX) cycle, or

greater than or equal to a paging occasion (PO) cycle;

determine that the first LP-WUS corresponds to a cell of the UE;

determine that the first LP-WUS indicates powering on the main radio;

turn on the main radio; and

receive, using the main radio, a paging message from the base station.

2 . The UE of claim 1 , wherein the processor is further configured to:

receive, using the main radio, a second legacy reference signal at a first second frequency point,

wherein the first LP-WUS is received at the first frequency point.

3 . The UE of claim 1 , wherein to determine that the first LP-WUS corresponds to the cell of the UE, the processor is further configured to:

determine that the first LP-WUS correlates to a first local sequence, wherein the first local sequence is generated using a physical cell identification (PCI) number of the cell.

4 . The UE of claim 3 , wherein the first local sequence is also generated using a UE ID number.

5 . The UE of claim 1 , wherein to determine that the first LP-WUS indicates powering on the main radio, the processor is further configured to determine that the first LP-WUS correlates to a first local sequence.

6 . The UE of claim 5 , wherein the processor is further configured to:

receive, using the LP-WUR, a second LP-WUS from the base station;

determine that the second LP-WUS correlates to a second local sequence; and

turn the main radio off responsive to the second LP-WUS.

7 . The UE of claim 1 , wherein the processor is further configured to:

in response to turning on the main radio, start a timer;

determine that the timer expires; and

in response to the timer expiration, turn off the main radio.

8 . The UE of claim 1 , wherein to determine that the first LP-WUS indicates powering on the main radio, the processor is further configured to determine that a power level of the first LP-WUS is higher than a power threshold.

9 . The UE of claim 1 , wherein to receive the first LP-WUS, the processor is further configured to:

calculate correlation values between received signals and a local sequence;

determine that a correlation value between a segment of the received signals and the local sequence is higher than a correlation threshold; and

determine that the segment of the received signals includes the first LP-WUS.

10 . The UE of claim 1 , wherein to receive the first LP-WUS, the processor is further configured to:

determine a first resource element (RE) of a second legacy reference signal;

determine an offset value;

determine a second RE of the first LP-WUS based on the first RE and the offset value; and

receive the first LP-WUS in the second RE.

11 . The UE of claim 10 , wherein the processor is further configured to:

receive, using the main radio, a configuration message from the base station,

wherein the configuration message indicates the second legacy reference signal and the offset value.

12 . The UE of claim 1 , wherein to receive the first LP-WUS, the processor is further configured to:

determine a first receiving beam to receive a second legacy reference signal;

determine a quasi co located (QCLed) type D beam relationship between the first receiving beam and a second receiving beam to receive the first LP-WUS;

determine the second receiving beam based on the first receiving beam and the QCLed type D beam relationship; and

receive the first LP-WUS with the second receiving beam.

13 . A method of a user equipment (UE) comprising:

receiving, using a main radio of the UE, a legacy reference signal at a first frequency point;

receiving, using a low power wake up radio (LP-WUR) of the UE, a first low power wake up signal (LP-WUS) from a base station at the first frequency point with a periodicity, wherein the periodicity is:

greater than or equal to a discontinuous reception (DRX) cycle,

greater than or equal to an extended discontinuous reception (eDRX) cycle, or

greater than or equal to a paging occasion (PO) cycle;

determining that the first LP-WUS corresponds to a cell of the UE;

determining that the first LP-WUS indicates powering on a main radio of the UE;

turning on the main radio; and

receiving, using the main radio, a paging message from the base station.

14 . The method of claim 13 , wherein the determining that the first LP-WUS corresponds to a cell of the UE further comprises:

determining that the LP-WUS correlates to a first local sequence, wherein the first local sequence is generated using a physical cell identification (PCI) number of the cell.

15 . The method of claim 13 , further comprising:

in response to turning on the main radio, starting a timer;

determining that the timer expires; and

in response to the timer expiration, turning off the main radio.

16 . The method of claim 13 , wherein the determining that the first LP-WUS indicates powering on the main radio of the UE further comprises determining that a power level of the first LP-WUS is higher than a power threshold.

17 . The method of claim 13 , wherein the receiving the first LP-WUS from the base station further comprises:

calculating correlation values between received signals and a local sequence;

determining that a correlation value between a segment of the received signals and the local sequence is higher than a correlation threshold; and

determining that the segment of the received signals includes the first LP-WUS.

18 . A non-transitory computer-readable medium (CRM) comprising instructions to, upon execution of the instructions by one or more processors of a user equipment (UE), cause the UE to perform operations, the operations comprising:

receiving, using a main radio of the UE, a legacy reference signal at a first frequency point;

receiving, using a low power wake up radio (LP-WUR) of the UE, a first low power wake up signal (LP-WUS) from a base station at the first frequency point with a periodicity, wherein the periodicity is:

greater than or equal to a discontinuous reception (DRX) cycle,

greater than or equal to an extended discontinuous reception (eDRX) cycle, or

greater than or equal to a paging occasion (PO) cycle;;

determining that the first LP-WUS corresponds to a cell of the UE;

determining that the first LP-WUS indicates powering on a main radio of the UE;

turning on the main radio; and

receiving, using the main radio, a paging message from the base station.

19 . The non-transitory CRM of claim 18 , wherein the determining that the first LP-WUS corresponds to a cell of the UE further comprises:

determining that the first LP-WUS correlates to a first local sequence, wherein the first local sequence is generated using a physical cell identification (PCI) number of the cell.

Assignments (1)

Continuity (2)

References Cited (21)