Method and apparatus for providing discontinuous reception (DRX)
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.
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.