US 7,680,071 B2 · Method and apparatus for managing power during a discontinuous reception mode

Abstract

A method and apparatus for managing power during discontinuous reception (DRX) mode are disclosed. A DRX mode is defined for a wireless transmit/receive unit (WTRU) for reducing power consumption of the WTRU. During the DRX mode, the WTRU enters into a sleep state and periodically wakes up for processing paging blocks for detecting a paging indication for the WTRU and a corresponding paging message. If the WTRU is paged the WTRU terminates the DRX mode. If the WTRU is not paged, the WTRU reenters the sleep state. For power management during the DRX mode, a synchronization update period is defined. The synchronization update period is a period for performing automatic frequency correction and/or frame time correction.

Claims40

Dependent claims

A method for power management of a wireless transmit/receive unit (WTRU) during a discontinuous reception (DRX) mode comprising a plurality of DRX cycles, the method comprising:

entering a sleep state in accordance with a DRX cycle of the plurality of DRX cycles;
waking up responsive to a start of a synchronization update block for the WTRU to perform at least one of an automatic frequency correction (AFC) and frame time correction (FTC) during the DRX cycle, the synchronization update block comprising a plurality of frames designated for the WTRU performing the at least one of the AFC and the FTC,
receiving a beacon signal in the synchronization update block;
extracting midamble signal from the beacon signal;
and
performing the at least one of the AFC and the FTC using the extracted midamble signal during the plurality of frames designated for the WTRU performing the at least one of the AFC and the FTC during the DRX cycle.

3 more elements

A wireless transmit/receive unit (WTRU) for power management during a discontinuous reception (DRX) mode comprising a plurality of DRX cycles, the WTRU comprising:

a plurality of power-consuming components;
a controller configured to:
turn off power to at least one of the power-consuming components in accordance with a DRX cycle of the plurality of DRX cycles and restore the power to the at least one of the power-consuming components responsive to a start of a synchronization update block for the WTRU during the DRX cycle to perform at least one of an automatic frequency correction (AFC) and frame time correction (FTC);
at least one of an AFC unit configured to perform the AFC during a synchronization update block after the controller has restored the power to the at least one of the power-consuming components, and
a FTC unit configured to perform the FTC during a synchronization update block after the controller has restored the power to the at least one of the power-consuming components,
the synchronization update block being a time period comprising a plurality of frames designated for the WTRU performing the at least one of the AFC and the FTC, and
at least one of the AFC and the FTC being performed using a midamble signal extracted from a beacon signal received in the synchronization update block during the plurality of frames designated for the WTRU performing the at least one of the AFC and the FTC during the DRX cycle.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for managing power during a discontinuous reception mode

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Method and apparatus for managing power during a discontinuous reception mode

Life of this patent

Abstract

Claims40