Method and apparatus for enhancing discontinuous reception in wireless systems

• US 8,228,829 B2
• Filed: 10/25/2007
• Issued: 07/24/2012
• Est. Priority Date: 10/27/2006
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Somasundaram, Shankar, Sammour, Mohammed, Chandra, Arty, Wang, Jin
• Primary Examiner(s): TRAN, PHUC H
• Application Number:
  US11/924,484
• Publication Number:
  US 20080101268A1
• Time in Patent Office: 1,734 Days
• Field of Search: 370/311, 370/350, 455/574
• US Class Current: 370/311
• 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 for discontinuous reception (DRX) in a wireless transmit receive unit (WTRU), the method comprising:

the WTRU receiving DRX configuration information in a radio resource control (RRC) message, the DRX configuration information comprising a DRX cycle periodicity;

while in a RRC_CONNECTED state, the WTRU receiving an indication during DRX active time that data is to be transmitted to the WTRU;

responsive to receiving the indication, the WTRU remaining in active time; and

the WTRU resuming DRX using the received DRX configuration information in response to receiving a DRX activation signal in a medium access control (MAC) message.

2. The method as in claim 1 further comprising grouping the DRX configuration information into a DRX profile.

3. The method as in claim 2 further comprising determining a DRX profile index associated with the DRX profile.

4. The method as in claim 3 further comprising the WTRU receiving the DRX profile over RRC signaling.

5. A method of discontinuous reception (DRX) in a wireless communication system, the method comprising:

a wireless transmit receive unit (WTRU) receiving DRX configuration information in a radio resource control (RRC) message, wherein the DRX configuration information comprises a DRX cycle periodicity and a minimum active period;

the WTRU receiving a data indication signal from an e Node-B (eNB) during the minimum active period;

responsive to receiving the data indication signal, the WTRU staying awake; and

the WTRU resuming DRX using the received DRX configuration information in response to receiving a DRX activation signal in a medium access control (MAC) message.

6. The method as in claim 5 further comprising the WTRU transmitting a signal to the eNB, wherein the signal comprises a request to enter DRX.

7. The method as in claim 6 further comprising the WTRU transmitting the signal to the eNB based on a trigger.

8. The method as in claim 6 further comprising the eNB responding to the signal with a second signal, wherein the second signal comprises further DRX configuration information.

9. The method as in claim 5 wherein the DRX configuration information comprises a DRX start time.

10. The method as in claim 5 wherein the DRX configuration information comprises a DRX minimum activation time and a DRX start time.

11. The method as in claim 5 further comprising

the WTRU resuming DRX operation at a start of a regular DRX cycle with the received DRX cycle periodicity.

12. The method as in claim 5 wherein the data indication signal comprises a data transmission start time and an indication of a temporal length of the data transmission.

13. A method of discontinuous reception (DRX) and discontinuous transmission (DTX) in a wireless communication system, the method comprising:

a wireless transmit receive unit (WTRU) receiving DRX configuration information in a radio resource control (RRC) message, wherein the DRX configuration information comprises a DRX cycle periodicity;

the WTRU receiving an indication that data is to be transmitted to the WTRU;

responsive to receiving the indication, the WTRU staying awake; and

the WTRU resuming DRX using the received DRX configuration information in response to receiving a DRX activation signal in a medium access control (MAC) message.

14. The method as in claim 13 further comprising the WTRU discontinuing DRX based on a serving cell strength falling below a threshold.

15. The method as in claim 13 further comprising determining a separate DRX cycle periodicity for certain services, wherein the certain services comprise at least one of voice-over-IP (VoIP) and web browsing.

16. A wireless transmit receive unit (WTRU), comprising:

a transceiver configured to receive discontinuous reception (DRX) configuration information in a radio resource control (RRC) message in an RRC_CONNECTED state, wherein the DRX configuration information comprises a DRX cycle periodicity;

the transceiver further configured to receive an indication during DRX active time that data is to be transmitted to the WTRU;

a processor configured to, responsive to receiving the indication, remain in DRX active time

the transceiver further configured to receive a DRX activation signal in a medium access control (MAC) message; and

the processor further configured to resume DRX using the received DRX configuration information in response to receiving the DRX activation signal.

17. The WTRU as in claim 16 wherein the

DRX configuration information comprises a DRX start time.

18. The WTRU as in claim 17 wherein the processor is further configured to

resume DRX at a start of a regular DRX cycle with the received DRX cycle periodicity.

19. The WTRU as in claim 16 wherein the transceiver is further configured to transmit a signal to the eNB, wherein the signal comprises a request to enter DRX.

20. The WTRU as in claim 19 wherein the transceiver is further configured to transmit the signal to the eNB based on a trigger.

21. The WTRU as in claim 16 wherein the transceiver is further configured to:

measure an inactivity time following reception of data; and

determine DRX operation start based on the inactivity time.

22. The WTRU as in claim 16 wherein the transceiver is further configured to:

remain in DRX operation for a minimum active period.