ENERGY-EFFICIENT PAGING IN WIRELESS NETWORKS

• US 20180054780A1
• Filed: 06/26/2017
• Published: 02/22/2018
• Est. Priority Date: 08/16/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Radulescu, Andrei Dragos, Gorokhov, Alexei Yurievitch, Zhang, Chengjin, Patel, Chirag Sureshbhai, Kadous, Tamer
• Granted Patent: US 10,952,142 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 68/005 Transmission of information for alerting of incoming communication
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/535 based on resource usage policies
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) and a base station operating in unlicensed spectrum may temporarily increase a paging opportunity window (POW) size, or reduce a time between POWs, in order to meet performance metrics or account for time periods when a base station is unable to win access to the wireless medium during a POW. In some cases, a UE may identify a failed listen-before-talk procedure and autonomously update the POW size. In other examples, a base station may initiate a change in POW size or increase a number of paging opportunities in order to meet achieve one or more key performance indicators (KPIs). After a predetermined period, or after a triggering condition is no longer present, the UE and the base station may reset the POW size or the number of paging opportunities to a nominal amount to conserve power.

Claims

1. A method for wireless communication, comprising:

receiving a message that indicates an increased number of paging opportunities for a user equipment (UE), wherein the increased number of paging opportunities is greater than a nominal number of paging opportunities for the UE;

monitoring a cell during one paging opportunity of the increased number of paging opportunities;

identifying a paging opportunity reset condition; and

resetting a discontinuous reception (DRX) cycle or a paging opportunity window (POW) duration based at least in part on identifying the paging opportunity reset condition.

2. The method of claim 1, wherein receiving the message that indicates the increased number of paging opportunities comprises:

receiving a message indicating that system information has changed.

3. The method of claim 1, further comprising:

monitoring the cell during a first subframe and a second subframe of a paging frame; and

transmitting a response to the message, wherein the increased number of paging opportunities is based at least in part on the response.

4. The method of claim 1, wherein the message indicating the increased number of paging opportunities comprises a message indicating that a POW duration is insufficient for a number of user UEs being paged.

5. The method of claim 1, wherein the increased number of paging opportunities comprises a decreased DRX cycle or an increased POW duration, or both.

6. The method of claim 1, wherein identifying the paging opportunity reset condition comprises:

receiving a message indicating the paging opportunity reset condition, wherein the DRX cycle or POW duration is reset based at least in part on receiving the message indicating the paging opportunity reset condition.

7. A method for wireless communication, comprising:

increasing a number of paging opportunities based at least in part on a paging opportunity trigger condition;

transmitting a paging message or a reference signal to one or more user equipments (UEs) during one or more paging opportunities of the increased number of paging opportunities;

identifying a paging opportunity reset condition; and

resetting a discontinuous reception (DRX) cycle or a paging opportunity window (POW) duration based at least in part on the identified paging opportunity reset condition.

8. The method of claim 7, further comprising:

determining that a paging latency exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

9. The method of claim 7, further comprising:

determining that a number of missed paging opportunities exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

10. The method of claim 7, further comprising:

determining that a number of UEs impacted by paging latency or missed paging opportunities exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

11. The method of claim 10, wherein the number of UEs impacted by paging latency or missed paging opportunities is based at least in part on a UE class or service category.

12. The method of claim 7, wherein the paging opportunity trigger condition is based at least in part on a condition of one or more UEs.

13. The method of claim 7, further comprising:

determining that a time between successful listen-before-talk (LBT) procedures for paging opportunities exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

14. The method of claim 7, further comprising:

increasing the number of paging opportunities comprises decreasing the DRX cycle or increasing the POW duration, or both.

15. The method of claim 14, further comprising:

determining that decreasing the DRX cycle is prioritized over increasing the POW duration, wherein decreasing the DRX cycle or increasing POW duration, or both, is based at least in part on the determination.

16. The method of claim 7, further comprising:

transmitting an indication that system information has changed; and

transmitting a system information message indicating the increased number of paging opportunities.

17. The method of claim 7, further comprising:

transmitting a message to at least one idle mode UE during a second subframe of a paging frame; and

receiving a response to the message from the at least one idle mode UE, wherein the number of paging opportunities is increased based at least in part on receiving the response.

18. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

receive a message that indicates an increased number of paging opportunities for a user equipment (UE), wherein the increased number of paging opportunities is greater than a nominal number of paging opportunities for the UE;

monitor a cell during one paging opportunity of the increased number of paging opportunities;

identify a paging opportunity reset condition; and

reset a discontinuous reception (DRX) cycle or a paging opportunity window (POW) duration based at least in part on identifying the paging opportunity reset condition.

19. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to:

monitor the cell during a first subframe and a second subframe of a paging frame; and

transmit a response to the message, wherein the increased number of paging opportunities is based at least in part on the response.

20. The apparatus of claim 18, wherein the increased number of paging opportunities comprises a decreased DRX cycle or an increased POW duration, or both.

21. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to:

identify the paging opportunity reset condition based at least in part on receiving a message indicating the paging opportunity reset condition; and

reset the DRX cycle or POW duration based at least in part on receiving the message indicating the paging opportunity reset condition.

22. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

increase a number of paging opportunities based at least in part on a paging opportunity trigger condition;

transmit a paging message or a reference signal to one or more user equipments (UEs) during one or more paging opportunities of the increased number of paging opportunities;

identify a paging opportunity reset condition; and

reset a discontinuous reception (DRX) cycle or a paging opportunity window (POW) duration based at least in part on the paging opportunity reset condition.

23. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to:

determine that a paging latency exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

24. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to:

determine that a number of missed paging opportunities exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

25. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to:

determine that a number of UEs impacted by paging latency or missed paging opportunities exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

26. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to:

determine that a time between successful listen-before-talk (LBT) procedures for paging opportunities exceeds a threshold, wherein the paging opportunity trigger condition comprises the threshold being exceeded.

27. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to:

increase the number of paging opportunities comprises decreasing the DRX cycle or increasing the POW duration, or both.

28. The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to:

determine that decreasing the DRX cycle is prioritized over increasing the POW duration, wherein decreasing the DRX cycle or increasing POW duration, or both, is based at least in part on the determination.

29. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit an indication that system information has changed; and

transmit a system information message indicating the increased number of paging opportunities.

30. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to:

transmit a message to at least one idle mode UE during a second subframe of a paging frame; and

receive a response to the message from the at least one idle mode UE, wherein the number of paging opportunities is increased based at least in part on receiving the response.