METHOD AND APPARATUS FOR ENHANCING DISCONTINUOUS RECEPTION IN WIRELESS SYSTEMS

• US 20080101268A1
• Filed: 10/25/2007
• Published: 05/01/2008
• 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
• Granted Patent: US 8,228,829 B2
• Time in Patent Office: Days
• 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 of discontinuous reception (DRX) in a wireless transmit receive unit (WTRU), the method comprising:

the WTRU receiving DRX setting information over a radio resource control (RRC) signal; and

the WTRU receiving DRX activation information over a medium access control (MAC) signal.

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

3. The method as in claim 2 further comprising determining a DRC 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) in a DRX minimum active period receiving a data indication signal from an e Node-B (eNB); and

the WTRU remaining in an active period based on the data indication signal.

6. The method as in claim 5 further comprising:

the WTRU discontinuing DRX operation based on the data indication signal; and

the WTRU resuming DRX operation based on a received signal from an eNB after data reception.

7. 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 mode.

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

9. The method as in claim 7 further comprising the eNB responding to the signal with a second signal, wherein the second signal comprises DRX settings information.

10. The method as in claim 5 wherein the data indication signal comprises a DRX start time.

11. The method as in claim 5 wherein the data indication signal comprises a DRX cycle time, a DRX minimum activation time, and a DRX start time.

12. The method as in claim 5 further comprising:

the WTRU discontinuing DRX operation based on the data indication signal; and

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

13. 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.

15. The method as in claim 5 wherein a DRX measurement cycle is dependent on a distance of a WTRU from a cell edge.

14. A method of discontinuous reception and discontinuous transmission in a wireless communication system, the method comprising coordinating DRX and discontinuous transmission (DTX) cycles such that the DRX and DTX cycles coincide.

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

17. The method as in claim 14 further comprising determining a separate DRX cycle for certain services, wherein the certain services comprise voice-over-IP (VOIP) and web browsing.

18. A wireless transmit receive unit (WTRU) configured to:

receive discontinuous reception (DRX) setting information in an radio resource control (RRC) signal; and

receive DRX activation information in a medium access control (MAC) signal.

19. The WTRU as in claim 18 wherein the WTRU is further configured to:

receive a data indication signal from an e Node-B (eNB) while the WTRU is in a DRX minimum active period; and

remain in an active period based on the data indication signal.

20. The WTRU as in claim 18 wherein the WTRU is further configured to:

discontinue DRX operation based on the data indication signal; and

resume DRX operation based on a received signal from an eNB after data reception.

21. The WTRU as in claim 18 wherein the WTRU is further configured to transmit a signal to the eNB, wherein the signal comprises a request to enter DRX mode.

22. The WTRU as in claim 21 wherein the WTRU is further configured to transmit the signal to the eNB based on a trigger.

23. The WTRU as in claim 18 wherein the WTRU is further configured to:

discontinue DRX operation based on the data indication signal; and

resume DRX operation at a start of a regular DRX cycle.

24. The WTRU as in claim 18 wherein the WTRU is further configured to:

measure an inactivity time following reception of data; and

determine DRX operation start based on the inactivity time.

25. The WTRU as in claim 18 wherein the WTRU is further configured to:

remain in DRX operation for a minimum active period.