COORDINATED UPLINK TRANSMISSION IN LTE DRX OPERATIONS FOR A WIRELESS TRANSMIT RECEIVE UNIT

• US 20090232118A1
• Filed: 03/12/2009
• Published: 09/17/2009
• Est. Priority Date: 03/14/2008
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Wang, Jin, Zhang, Guodong, Olvera-Hernandez, Ulises
• Granted Patent: US 8,249,004 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for discontinuous reception (DRX) operation in a wireless transmit receive unit aligns uplink and downlink transmissions with a DRX cycle. The transmission may be a channel quality indicator report, a sounding reference signal, or a silence descriptor among other downlink and uplink transmissions.

Claims

1. A method implemented by a wireless transmit receive unit (WTRU) for aligning uplink transmissions with a discontinuous reception (DRX) cycle, comprising:

receiving from an eNodeB a request for an uplink transmission;

determining that the DRX cycle configuration is for a DRX cycle of a first length;

receiving an uplink channel allocation for the uplink transmission, the allocation having timing aligned with a DRX on duration period or a DRX active time period of the DRX cycle of the first length; and

sending the uplink transmission during the DRX on duration period or the DRX active time period.

2. The method as in claim 1, wherein the uplink transmission is aperiodic.

3. The method as in claim 1, wherein the uplink transmission is a channel quality indicator (CQI) report.

4. The method as in claim 3, further comprising receiving an allocation of a physical uplink shared channel (PUSCH) for the CQI report for the DRX cycle of the first length, on the condition that the DRX cycle is shorter than a configured threshold.

5. The method as in claim 3, further comprising receiving a CQI request from an eNB and starting an inactivity timer.

6. The method as in claim 3, further comprising setting the DRX active time period to a length sufficient for transmitting the CQI report and receiving a request and allocation for an aperiodic CQI report.

7. The method as in claim 1, wherein the uplink transmission is periodic.

8. The method as in claim 7, wherein the uplink transmission a sounding reference symbol (SRS) transmission.

9. The method as in claim 8, further comprising comparing the length of the DRX cycle of the first length to the SRS transmission period and sending the SRS transmission on a condition that a the SRS transmission period is greater than or equal to the length of the DRX cycle of the first length.

10. The method as in claim 7, further comprising configuring a DRX cycle of a second length that is longer than the first length, determining the SRS transmission period and aligning SRS with the DRX cycle of the second length, and sending the SRS transmission during a DRX active time period on a condition that the SRS transmission period equals an integer multiple of the length of the DRX cycle of the second length.

11. A method for aligning a DRX cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:

receiving a plurality of SID packets during a VoIP silent period;

activating a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and

aligning the long DRX cycle with subsequently received SID packets in a downlink signal.

12. A method for aligning a DRX cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:

sending a scheduling request for an uplink SID transmission, the scheduling request sent during a DRX on duration or a DRX active time period of a DRX cycle;

receiving an allocation for the uplink SID transmission during the DRX on duration or the DRX active time period;

activating a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and

aligning the long DRX cycle with subsequently sent uplink SID transmission.

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

a processor configured to receive a request for an uplink transmission;

determine that a discontinuous reception (DRX) cycle configuration is for a DRX cycle of a first length;

receive an uplink channel allocation for the uplink transmission, the allocation having timing aligned with a DRX on duration period or a DRX active time period of th DRX cycle of the first length; and

send the uplink transmission during the DRX on duration period or the DRX active time period.

14. The WTRU as in claim 13, wherein the uplink transmission is aperiodic.

15. The WTRU as in claim 13, wherein the uplink transmission is a channel quality indicator (CQI) report.

16. The WTRU as in claim 15, further comprising receiving an allocation of a physical uplink shared channel (PUSCH) for the CQI report for the DRX cycle of the first length, on the condition that the DRX cycle length is shorter than a configured threshold.

17. The WTRU as in claim 15, further comprising receiving a CQI request from an eNB and starting an inactivity timer.

18. The WTRU as in claim 15, further comprising setting the DRX active time period to a length sufficient for transmitting the CQI report and receiving a request and allocation for an aperiodic CQI report.

19. The WTRU as in claim 13, wherein the uplink transmission is periodic.

20. The WTRU as in claim 19, wherein the uplink transmission a sounding reference symbol (SRS) transmission.

21. The WTRU as in claim 20, wherein the processor is further configured to determine a SRS transmission period, compare the DRX cycle length to the SRS transmission period, and send the SRS transmission on a condition that the DRX cycle length is greater than or equal to the SRS transmission period.

22. The WTRU as in claim 18, wherein the processor is further configured to configure a DRX cycle of a second length, determine the SRS transmission period and align the SRS with the DRX cycle, and transmit the SRS during a DRX active time period on a condition that the SRS transmission period equals an integer multiple of the length of the DRX cycle of the second length.

23. A WTRU for aligning a DRX cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:

a processor configured to receive a plurality of SID packets during a VoIP silent period;

activate a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and

align the long DRX cycle with subsequently received SID packets in a downlink signal.

24. A WTRU for aligning a DRX cycle with a silence identifier (SID) packet transmission of a wireless communication, comprising:

a processor configured to send a scheduling request for an uplink SID transmission, the scheduling request sent during a DRX on duration or a DRX active time period of a DRX cycle;

receive an allocation for the uplink SID transmission during the DRX on duration or the DRX active time period;

activate a long DRX cycle on a condition that a DRX on duration timer or a DRX inactivity timer has expired; and

align the long DRX cycle with subsequently sent uplink SID transmission.