US 8,527,014 B2Granted

Sleep mode for wireless communication device during out of service operation

AssigneeQUALCOMM Incorporated

InventorsMessay Amerga, Bhupesh Umatt, Vineet Mittal

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Abstract

The disclosure is directed to techniques for performing service signal searches with reduced power consumption when a wireless communication device is operating out of service. The techniques include placing the wireless communication device in a “deep sleep” mode when the wireless communication device is not in service. When operating in the deep sleep mode, the wireless communication device reduces power consumption by not looking for paging signals or searching for service signals. The wireless communication device then may periodically enter a wake-up period during which power consumption is increased to perform signal searches in one or more frequency bands. The wireless communication device returns to the deep sleep mode when the signal searches are unsuccessful.

Claims41

Dependent claims

A method comprising:

placing a wireless communication device in a deep sleep mode, in which the wireless communication device does not search for service signals;
periodically increasing power in the wireless communication device to initiate one or more wake-up periods;
performing a service signal search in one or more frequency bands supported by the wireless communication device during the wake-up periods, wherein performing the signal service search during the wake up periods comprises:
performing an acquisition database scan for a service signal supporting the wireless communication device, the acquisition database scan comprising a database scan of preloaded channels and dynamically learned channels, wherein dynamically learned channels comprise channels added and updated by the wireless communication device on which the wireless communication device previously received service;
and
when the acquisition database scan is unsuccessful in locating signal service, performing a limited full frequency scan;
and
returning the wireless communication device to the deep sleep mode when the service signal search is unsuccessful;
wherein the limited full frequency scan comprises performing a full frequency scan of frequency bands supported by the wireless communication device when less than a predetermined number of service requests for supported frequency bands has been received, and in situations when both:
a quantity equal to or greater than the predetermined number of service requests for supported frequency bands has been received;
and
a full frequency timer has expired.

9 more elements

A non-transitory computer-readable medium comprising instructions that cause a processor to:

place a wireless communication device in a deep sleep mode, in which the wireless communication device does not search for service signals;
periodically increase power in the wireless communication device to initiate one or more wake-up periods;
perform a service signal search in one or more frequency bands supported by the wireless communication device during the wake-up periods, the service signal search comprising:
performing an acquisition database scan of preloaded channels and dynamically searched channels for a service signal supporting the wireless communication device, the acquisition database scan comprising a database scan of preloaded channels and dynamically learned channels, wherein dynamically learned channels comprise channels added and updated by the wireless communication device on which the wireless communication device previously received service;
and
when the acquisition database scan is unsuccessful in locating signal service, performing a limited full frequency scan;
and
return the wireless communication device to the deep sleep mode when the service signal search is unsuccessful;
wherein the limited full frequency scan comprises performing a full frequency scan of frequency bands supported by the wireless communication device when less than a predetermined number of service requests for supported frequency bands has been received, and in situations when both:
a quantity equal to or greater than the predetermined number of service requests for supported frequency bands has been received;
and
a full frequency timer has expired.

9 more elements

A wireless communication device comprising a controller that:

places a wireless communication device in a deep sleep mode, in which the wireless communication device does not search for service signals;
periodically increases power in the wireless communication device to initiate one or more wake-up periods;
performs a service signal search in one or more frequency bands supported by the wireless communication device during the wake-up periods, the service signal search comprising:
performing an acquisition database scan of preloaded channels and dynamically searched channels for a service signal supporting the wireless communication device, the acquisition database scan comprising a database scan of preloaded channels and dynamically learned channels, wherein dynamically learned channels comprise channels added and updated by the wireless communication device on which the wireless communication device previously received service;
and
when the acquisition database scan is unsuccessful in locating signal service, performing a limited full frequency scan;
and
returns the wireless communication device to the deep sleep mode when the service signal search is unsuccessful;
wherein the limited full frequency scan comprises performing a full frequency scan of frequency bands supported by the wireless communication device when less than a predetermined number of service requests for supported frequency bands has been received, and in situations when both:
a quantity equal to or greater than the predetermined number of service requests for supported frequency bands has been received;
and
a full frequency timer has expired.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/283,100Filed 6 Mar 2006 · us provisional application
Priority: 8 Aug 2005
Published: US 2007/0207841 A16 Sep 2007
Granted: 3 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04W 52/287
Using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission: when the channel is in stand-by
H04W 52/0229
Using monitoring of external events, e.g. the presence of a signal: where the received signal is a wanted signal
Y02D 30/70
Reducing energy consumption in communication networks: in wireless communication networks
H04W
Wireless communication networks