Method and apparatus for enhancing discontinuous reception in wireless systems

Patent metadata

Field	Value
Publication number	US-10165606-B2
Application number	US-201615336258-A
Country	US
Kind code	B2
Filing date	Oct 27, 2016
Priority date	Oct 27, 2006
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

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.

First claim

What is claimed:

1. A method implemented by a wireless transmit receive unit (WTRU), the method comprising:
the WTRU receiving a radio resource control (RRC) message, the 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 DRX minimum active period;
the WTRU receiving a data indication signal during the DRX minimum active period of a DRX cycle, the data indication signal indicating that downlink data is to be sent to the WTRU;
the WTRU receiving the downlink data;
the WTRU receiving a medium access control (MAC) message comprising a DRX activation message; and
the WTRU resuming DRX operation based on receiving the MAC message comprising the DRX activation message.

2. The method as in claim 1 , wherein the MAC message comprising the DRX activation message indicates that the WTRU can go to sleep until the start of a subsequent DRX cycle.

3. The method as in claim 1 , wherein the MAC message comprising the DRX activation message indicates that the WTRU can go to sleep for a predetermined period of time.

4. The method as in claim 1 , wherein the WTRU performs DRX in accordance with the DRX configuration while in an RRC_CONNECTED state.

5. The method as in claim 1 , wherein the data indication signal is received via a Layer 1 control channel.

6. The method as in claim 5 , further comprising the WTRU monitoring the Layer 1 control channel during the minimum active period of the DRX cycle.

7. The method as in claim 6 , wherein the WTRU goes to sleep at the end of the minimum active period of the DRX cycle on condition that no data indication signal is received during the minimum active period of the DRX cycle.

8. The method as in claim 7 , wherein the WTRU goes to sleep until a start of a next DRX cycle.

9. The method as in claim 1 , wherein the DRX configuration comprises an indication of a DRX cycle start time.

10. The method as in claim 9 , wherein the minimum active period of a DRX cycle begins at a time indicated by the DRX cycle start time.

11. A wireless transmit receive unit (WTRU), the WTRU comprising a processor and memory, the WTRU configured to:
receive a radio resource control (RRC) message, the 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 DRX minimum active period;
receive a data indication signal during the DRX minimum active period of a DRX cycle, the data indication signal indicating that downlink data is to be sent to the WTRU;
receive the downlink data;
receive a medium access control (MAC) message comprising a DRX activation message; and
resume DRX operation based on receiving the MAC message comprising the DRX activation message.

12. The WTRU as in claim 11 , wherein the MAC message comprising the DRX activation message indicates that the WTRU can go to sleep until the start of a subsequent DRX cycle.

13. The WTRU as in claim 11 , wherein the downlink data is received via a downlink shared channel.

14. The WTRU as in claim 11 , wherein the WTRU is configured to perform DRX in accordance with the DRX configuration while in an RRC_CONNECTED state.

15. The WTRU as in claim 11 , wherein the data indication signal is received via a Layer 1 control channel.

16. The WTRU as in claim 15 , wherein the WTRU is configured to monitor the Layer 1 control channel during the minimum active period of the DRX cycle.

17. The WTRU as in claim 16 , wherein the WTRU is configured to go to sleep at the end of the minimum active period of the DRX cycle on condition that no data indication signal is received during the minimum active period of the DRX cycle.

18. The WTRU as in claim 11 , wherein the DRX configuration comprises an indication of a DRX cycle start time.

19. The WTRU as in claim 18 , wherein the minimum active period of a DRX cycle begins at a time indicated by the DRX cycle start time.

20. A device comprising a processor and memory, the device configured to:
send a radio resource control (RRC) message to a wireless transmit receive unit (WTRU), the 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 DRX minimum active period;
send a data indication signal, the data indication signal indicating that downlink data is to be sent to the WTRU;
send the downlink data; and
send a medium access control (MAC) message comprising a DRX activation message, the MAC message comprising the DRX activation message indicating indication that the WTRU can resume DRX operation.

Assignees

• Interdigital Tech Corp

Inventors

• Sammour Mohammed
• Chandra Arty
• Wang Jin
• Somasundaram Shankar

Classifications

• H04W52/0206 Primary

  in access points, e.g. base stations · CPC title

• H04W52/0216

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

• H04W76/28

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

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W76/20

  Manipulation of established connections · CPC title