Systems and methods for connected mode discontinuous reception on/off determinations

Patent metadata

Field	Value
Publication number	US-12309700-B2
Application number	US-202217933923-A
Country	US
Kind code	B2
Filing date	Sep 21, 2022
Priority date	Sep 21, 2022
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

Systems and methods related to “on/off” determinations regarding the performance of physical downlink control channel (PDCCH) monitoring during connected mode discontinuous reception (CDRX) on duration windows are disclosed herein. In some cases, a radio access network (RAN) predicts whether a downlink (DL) packet for a UE will arrive at a buffer of the RAN prior to an end of a CDRX on duration window of the UE, and sends a downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a power-saving radio network temporary identifier (PS-RNTI) (DCP) for the CDRX on duration window indicating whether or not the UE should perform PDCCH monitoring during the CDRX on duration window based on the prediction. In some cases, a UE determines a current state of DL traffic and adaptively uses DCP monitoring based on the current state of the traffic. Aggregation level adaptation by the RAN is also discussed.

First claim

The invention claimed is:

1. An apparatus of a user equipment (UE), comprising:
one or more processors; and
a memory storing instructions that, when executed by the one or more processors, cause the one or more processors to operate the apparatus to:
monitor a state of periodic traffic that is received at the UE using a defined set of connected mode discontinuous reception (CDRX) on duration windows in order to identify when the state of the periodic traffic has transitioned to an active state during which a volume of the periodic traffic is relatively higher and when the state of the periodic traffic has transitioned to a silent state during which the volume of the periodic traffic is relatively lower;
after identifying that the state of the periodic traffic has transitioned to the silent state, perform downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a power-saving radio network temporary identifier (PS-RNTI) (DCP) monitoring to identify ones of first CDRX on duration windows of the defined set of CDRX on duration windows that occur during the silent state during which to perform physical downlink control channel (PDCCH) monitoring; and
after identifying that the state of the periodic traffic has transitioned to the active state, skip the DCP monitoring and performing the PDCCH monitoring during each of second CDRX on duration windows of the defined set of CDRX on duration windows that occur during the active state.

2. The apparatus of claim 1 , wherein the apparatus identifies that the state of the periodic traffic has transitioned to the silent state by determining that no PDCCH has been detected at the UE for a number of consecutive CDRX on duration windows of the defined set of CDRX on duration windows.

3. The apparatus of claim 1 , wherein the apparatus identifies that the state of the periodic traffic has transitioned to the silent state by determining that a number of consecutive silence insertion description (SID) packets have been received at the UE.

4. The apparatus of claim 1 , wherein the apparatus identifies that the state of the periodic traffic has transitioned to the active state by determining that the UE has received:
a number of consecutive DCPs indicating that PDCCH monitoring is to be performed during corresponding CDRX on duration windows of the defined set of CDRX on duration windows; and
a PDCCH during each of the corresponding CDRX on duration windows.

5. The apparatus of claim 1 , wherein the apparatus identifies that the state of the periodic traffic has transitioned to the active state by determining that the UE has received a number of consecutive active voice packets.

6. A method of a user equipment (UE), comprising:
monitoring a state of periodic traffic that is received at the UE using a defined set of connected mode discontinuous reception (CDRX) on duration windows in order to identify when the state of the periodic traffic has transitioned to an active state during which a volume of the periodic traffic is relatively higher and when the state of the periodic traffic has transitioned to a silent state during which the volume of the periodic traffic is relatively lower;
after identifying that the state of the periodic traffic has transitioned to the silent state, performing downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a power-saving radio network temporary identifier (PS-RNTI) (DCP) monitoring to identify ones of first CDRX on duration windows of the defined set of CDRX on duration windows that occur during the silent state during which to perform physical downlink control channel (PDCCH) monitoring; and
after identifying that the state of the periodic traffic has transitioned to the active state, skipping the DCP monitoring and performing the PDCCH monitoring during each of second CDRX on duration windows of the defined set of CDRX on duration windows that occur during the active state.

7. The method of claim 6 , wherein the UE identifies that the state of the periodic traffic has transitioned to the silent state by determining that no PDCCH has been detected for a number of consecutive CDRX on duration windows of the defined set of CDRX on duration windows.

8. The method of claim 6 , wherein the UE identifies that the state of the periodic traffic has transitioned to the silent state by determining that a number of consecutive silence insertion description (SID) packets have been received.

9. The method of claim 6 , wherein the UE identifies that the state of the periodic traffic has transitioned to the active state by determining that it has received:
a number of consecutive DCPs indicating that PDCCH monitoring is to be performed during corresponding CDRX on duration windows of the defined set of CDRX on duration windows; and
a PDCCH during each of the corresponding CDRX on duration windows.

10. The method of claim 6 , wherein the UE identifies that the state of the periodic traffic has transitioned to the active state by determining that it has received a number of consecutive active voice packets.

11. A non-transitory computer-readable storage medium including instructions that, when executed by a one or more processors of a user equipment (UE), cause the UE to:
monitor a state of periodic traffic that is received at the UE using a defined set of connected mode discontinuous reception (CDRX) on duration windows in order to identify when the state of the periodic traffic has transitioned to an active state during which a volume of the periodic traffic is relatively higher and when the state of the periodic traffic has transitioned to a silent state during which the volume of the periodic traffic is relatively lower;
after identifying that the state of the periodic traffic has transitioned to the silent state, perform downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a power-saving radio network temporary identifier (PS-RNTI) (DCP) monitoring to identify ones of first CDRX on duration windows of the defined set of CDRX on duration windows that occur during the silent state during which to perform physical downlink control channel (PDCCH) monitoring; and
after identifying that the state of the periodic traffic has transitioned to the active state, skip the DCP monitoring and performing the PDCCH monitoring during each of second CDRX on duration windows of the defined set of CDRX on duration windows that occur during the active state.

12. The non-transitory computer-readable storage medium of claim 11 , wherein the UE identifies that the state of the periodic traffic has transitioned to the silent state by determining that no PDCCH has been detected at the UE for a number of consecutive CDRX on duration windows of the defined set of CDRX on duration windows.

13. The non-transitory computer-readable storage medium of claim 11 , wherein the UE identifies that the state of the periodic traffic has transitioned to the silent state by determining that a number of consecutive silence insertion description (SID) packets have been received at the UE.

14. The non-transitory computer-readable storage medium of claim 11 , wherein the UE identifies that the state of the periodic traffic has transitioned to the active state by determining that the UE has received:
a number of consecutive DCPs indicating that PDCCH monitoring is to be performed during corresponding CDRX on duration windows of the defined set of CDRX on duration windows; and
a PDCCH during each of the corresponding CDRX on duration windows.

15. The non-transitory computer-readable storage medium of claim 11 , w

Assignees

• Apple Inc

Inventors

• Zhang Lijie
• Cui Lele
• Tu Xiaolong
• Yang Dongzhou
• Tao Tao
• Zhou Lei
• Xu Zihuan

Classifications

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04L1/0061

  Error detection codes · CPC title

• H04W52/0229

  where the received signal is a wanted signal · CPC title

• H04W52/0216

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• Y02D30/70

  in wireless communication networks · CPC title