Method and apparatus for enhancing discontinuous reception in wireless systems

• US 10,667,211 B2
• Filed: 10/17/2018
• Issued: 05/26/2020
• Est. Priority Date: 10/27/2006
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Sammour, Mohammed, Chandra, Arty, Wang, Jin, Somasundaram, Shankar
• Primary Examiner(s): Tran, Phuc H
• Application Number:
  US16/163,290
• Publication Number:
  US 20190053151A1
• Time in Patent Office: 587 Days
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of discontinuous reception (DRX) in a wireless transmit receive unit (WTRU) includes the WTRU receiving DRX setting information over a radio resource control (RRC) signal, and the WTRU receiving DRX activation information over medium access control (MAC) signal.

Claims

1. A method implemented by a wireless transit/receive unit (WTRU), the method comprising:

the WTRU receiving a radio resource control (RRC) message comprising a discontinuous reception (DRX) configuration, the DRX configuration comprising an indication of a DRX cycle periodicity and an indication of a length of a minimum active period of a DRX cycle;

the WTRU monitoring a control channel during the minimum active period of a first DRX cycle;

the WTRU receiving a data indication signal via the control channel during the minimum active period, the data indication signal indicating that downlink data is to be transmitted to the WTRU;

the WTRU staying awake beyond the minimum active period of the first DRX cycle based on receiving the data indication signal; and

the WTRU determining to resume DRX based on inactivity.

2. The method of claim 1, further comprising the WTRU receiving the downlink data during an active period of the first DRX cycle.

3. The method of claim 1, wherein the DRX configuration further comprises an indication of a DRX active period start position.

4. The method of claim 1, wherein an active period of the first DRX cycle is of variable length depending on an amount of data transmissions sent to the WTRU.

5. The method of claim 1, wherein a medium access control (MAC) message is used to explicitly signal an end of an active period of a second DRX cycle.

6. The method of claim 1, wherein the control channel comprises a Layer 1 (L1) control channel.

7. The method of claim 1, wherein the WTRU goes to sleep at an end of a minimum active period of a second DRX cycle based on the WTRU not receiving any data indication signals during the minimum active period of the second DRX cycle.

8. The method of claim 1, wherein the WTRU transmits a request to resume DRX based on detecting the inactivity, and the WTRU receives a response indicating that the WTRU resume DRX.

9. A wireless transit/receive unit (WTRU) comprising a processor and memory, the WTRU configured to:

receive a radio resource control (RRC) message comprising a discontinuous reception (DRX) configuration, the DRX configuration comprising an indication of a DRX cycle periodicity and an indication of a length of a minimum active period of a DRX cycle;

monitor a control channel during the minimum active period of a first DRX cycle;

receive a data indication signal via the control channel during the minimum active period, the data indication signal indicating that downlink data is to be transmitted to the WTRU;

stay awake beyond the minimum active period of the first DRX cycle based on receiving the data indication signal; and

determine to resume DRX based on inactivity.

10. The WTRU of claim 9, wherein the WTRU is further configured to receive the downlink data during an active period of the first DRX cycle.

11. The WTRU of claim 9, wherein the DRX configuration further comprises an indication of a DRX active period start position.

12. The WTRU of claim 9, wherein an active period of the first DRX cycle is of variable length depending on an amount of data transmissions sent to the WTRU.

13. The WTRU of claim 9, wherein a medium access control (MAC) message is used to explicitly signal an end of an active period of a second DRX cycle.

14. The WTRU of claim 9, wherein the control channel comprises a Layer 1 (L1) control channel.

15. The WTRU of claim 9, wherein the WTRU is configured to go to sleep at an end of a minimum active period of a second DRX cycle based on the WTRU not receiving any data indication signals during the minimum active period of the second DRX cycle.

16. The WTRU of claim 9, wherein the WTRU is configured to transmit a request to resume DRX based on detecting the inactivty, and the WTRU is configured to receive a response indicating that the WTRU resume DRX.

17. A wireless transmit/receive unit (WTRU) comprising a processor and memory, the WTRU configured to:

receive a radio resource control (RRC) message comprising a discontinuous reception (DRX) configuration, the DRX configuration comprising an indication of a DRX cycle periodicity and an indication of a length of a minimum active period of a DRX cycle;

monitor a control channel during the minimum active period of a first DRX cycle;

receive a data indication signal via the control channel during the minimum active period, the data indication signal indicating that downlink data is to be transmitted to the WTRU, wherein an active period of the first DRX cycle is of variable length depending on an amount of data transmissions sent to the WTRU; and

stay awake beyond the minimum active period of the first DRX cycle based on receiving the data indication signal.

18. The WTRU of claim 17, wherein the WTRU is further configured to receive the downlink data during the active period of the first DRX cycle.

19. The WTRU of claim 17, wherein the DRX configuration further comprises an indication of a DRX active period start position.

20. The WTRU of claim 17, wherein a medium access control (MAC) message is used to explicitly signal an end of an active period of a second DRX cycle.

21. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:

the WTRU receiving a radio resource control (RRC) message comprising a discontinuous reception (DRX) configuration, the DRX configuration comprising an indication of a DRX cycle periodicity and an indication of a length of a minimum active period of a DRX cycle;

the WTRU monitoring a control channel during the minimum active period of a first DRX cycle;

the WTRU receiving a data indication signal via the control channel during the minimum active period, the data indication signal indicating that downlink data is to be transmitted to the WTRU, wherein an active period of the first DRX cycle is of variable length depending on an amount of data transmissions sent to the WTRU; and

the WTRU staying awake beyond the minimum active period of the first DRX cycle based on receiving the data indication signal.

22. The method of claim 21, further comprising the WTRU receiving the downlink data during the active period of the first DRX cycle.

23. The method of claim 21, wherein the DRX configuration further comprises an indication of a DRX active period start position.

24. The method of claim 21, wherein a medium access control (MAC) message is used to explicitly signal an end of an active period of a second DRX cycle.