Method and apparatus for providing discontinuous reception (DRX)

• US 9,167,546 B2
• Filed: 03/22/2007
• Issued: 10/20/2015
• Est. Priority Date: 03/24/2006
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Wang, Jin, Chen, John S., Sammour, Mohammed, Terry, Stephen E., Chandra, Arty, Zhang, Guodong
• Primary Examiner(s): Brandt, Christopher M
• Application Number:
  US11/689,771
• Publication Number:
  US 20070230394A1
• Time in Patent Office: 3,134 Days
• Field of Search: 4553431-3436, 455/13.4, 455/522, 455/572, 455/127.5, 455/574, 370/311
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 92/10 between terminal device and access point, i.e. wireless air interface
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Providing discontinuous reception (DRX) is disclosed. In DRX mode a wireless transmit/receive unit (WTRU) may periodically wake up, in relation to a DRX interval, to check for a paging message. The WTRU may reenter the DRX mode if there is no paging message. The WTRU may receive another specified DRX interval, in connection with a broadcast message, based on the activity of the WTRU. The another DRX interval may be increased as inactivity of the WTRU increases.

Claims

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

receiving, by the WTRU, discontinuous reception (DRX) control information indicating a predetermined time interval that the WTRU checks a physical downlink control channel for an identifier associated with the WTRU;

entering, by the WTRU, a DRX mode such that the WTRU periodically wakes up according to the predetermined time interval to check for a paging message and wherein the WTRU reenters the DRX mode based at least in part on there being no paging message associated with the WTRU;

monitoring, by the WTRU, activity of the WTRU; and

increasing, by the WTRU, the DRX interval as inactivity of the WTRU increases.

2. The method of claim 1 wherein the DRX interval is increased exponentially.

3. The method of claim 1 further comprising:

providing, by the WTRU to the wireless network, whether the WTRU is powered by a battery or a constant power supply to set the DRX interval.

4. The method of claim 1 further comprising:

providing, by the WTRU to the wireless network, its current battery capacity so that the DRX interval is set based on the current battery capacity.

5. The method of claim 1 wherein battery consumption of the WTRU is reduced when the DRX interval is increased as the inactivity increases.

6. The method of claim 1, further comprising:

receiving uplink channel allocation information indicating periodic subframes available for the WTRU to send channel quality indicator (CQI) information.

7. The method of claim 6, further comprising:

determining whether a flag bit is set in response to receiving uplink scheduling information on the physical downlink control channel having the identifier associated with the WTRU.

8. The method of claim 7, further comprising:

transmitting a CQI on an uplink shared channel in response to the flag bit being set.

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

circuitry configured to receive an indication of a discontinuous reception (DRX) interval from a wireless network;

circuitry configured to enter a discontinuous reception (DRX) mode in accordance with the DRX interval; and

circuitry configured to monitor activity of the WTRU, wherein the circuitry is configured to increase the DRX interval as inactivity of the WTRU increases.

10. The WTRU of claim 9 wherein the DRX interval is increased exponentially.

11. The WTRU of claim 9 wherein the WTRU provides the wireless network with information whether the WTRU is powered by a battery or a constant power supply and the wireless network sets the DRX interval based on the information.

12. The WTRU of claim 9 wherein the WTRU informs the wireless network about its current battery capacity so that the DRX interval is set based on the current battery capacity.

13. The WTRU of claim 9 wherein battery consumption of the WTRU is reduced when the DRX interval is increased as the inactivity increases.

14. The WTRU of claim 9, wherein the circuitry is configured to:

receive uplink channel allocation information indicating periodic subframes available for the WTRU to send channel quality indicator (CQI) information.

15. The WTRU of claim 14, wherein the circuitry is configured to:

determine whether a flag bit is set in response to receiving uplink scheduling information on the physical downlink control channel having the identifier associated with the WTRU.

16. The WTRU of claim 15, wherein the circuitry is configured to:

transmit a CQI on an uplink shared channel in response to the flag bit being set.