Power management mechanism for unlicensed wireless communication systems
View Patent ↗A method is disclosed. The method includes a mobile station (MS) operating on a licensed communication network via a first radio, the MS switching operation from the licensed communication network to operating on an unlicensed communication network via a second radio and deactivating the first radio upon switching operation to the unlicensed communication network.
1. A method comprising:
operating a mobile station (MS) on a licensed communication network via a first radio;
determining whether a camping cell associated with the licensed communication network is available;
when a camping cell associated with the licensed communication network is available, at the MS, storing system information of the camping cell;
switching the MS from operating on the licensed communication network to operating on an unlicensed communication network via a second radio;
detaching, at the MS, a radio resource (RR) protocol sub-layer associated with the licensed communication network from a plurality of upper protocol layers;
at the MS, shutting down a layer 1 protocol layer associated with the licensed communication network prior to deactivating the first radio; and
deactivating the first radio after the MS has switched operation to the unlicensed communication network.
2. The method of claim 1 further comprising detecting a condition.
3. The method of claim 2 wherein the condition occurs when the MS changes access points as a result of roving or handover.
4. The method of claim 2 wherein the condition occurs when the MS detects that rove-out or handover-out is necessary due to deterioration of unlicensed radio link condition.
5. The method of claim 2 wherein the condition occurs when the MS detects that rove-out or handover-out is necessary due to other conditions not directly related to unlicensed radio link condition.
6. The method of claim 2 further comprising activating the RR protocol sub-layer associated with the licensed communication network in response to detecting the condition.
7. The method of claim 6 further comprising restoring previously stored system information after a frequency/time synchronization is done.
8. The method of claim 6 further comprising activating the first radio.
9. A mobile station (MS) comprising:
a licensed component comprising a licensed radio, a layer 1 protocol layer, and a radio resource (RR) licensed sub-layer to operate on a licensed network; and
an unlicensed component to operate on an unlicensed network, wherein the licensed component is deactivated whenever the MS has switched operation to the unlicensed network, said deactivation comprising the MS detaching the RR licensed sub-layer from a plurality of upper protocol layers and deactivating the licensed radio, wherein the layer 1 protocol layer is shut off and the RR licensed sub-layer is detached prior to deactivating the licensed radio.
10. A system comprising:
a licensed network;
an unlicensed network; and
a mobile station (MS) including:
a licensed component comprising a licensed radio and a radio resource (RR) licensed sub-layer to operate on the licensed network; and
an unlicensed component to operate on the unlicensed network, wherein the licensed component is deactivated whenever the MS has switched operation to the unlicensed network, said deactivation comprising the MS detaching the RR licensed sub-layer from a plurality of upper protocol layers and deactivating the licensed radio, wherein the RR licensed sub-layer is detached prior to deactivating the licensed radio.
11. A method comprising:
deactivating, at a mobile station (MS), a licensed radio after the MS has switched operation from a licensed communication network to an unlicensed communication network;
detecting a condition by the MS for reactivating the licensed radio;
determining whether the MS has stored a copy of information of a camping cell prior to deactivating the licensed radio;
when the MS has stored the information of the camping cell, the MS performs an instant wakeup comprising:
tuning to an absolute radio frequency channel number (ARFCN) of a target cell;
searching for a frequency correction channel (FCCH) and a synchronization channel (SCH) of the target cell;
determining whether the MS has synchronized to the FCCH and SCH of the target cell; and
restoring the information the MS stored prior to deactivating the licensed radio;
determining whether the target cell is found;
when the target cell is found, the MS moving a radio resource protocol sub-layer into a detached cell reselection mode; and
when the target cell is not found, the MS initiating normal licensed cell selection procedures.
12. The method of claim 11 , wherein the detached cell reselection mode comprises a radio resource (RR) licensed sub-layer performing traditional cell selection and cell reselection procedures, wherein the RR licensed sub-layer is detached from an access mode switch and not servicing a set of protocol layers above the RR licensed sub-layer.
13. The method of claim 12 , wherein the RR licensed sub-layer is not informing a mobility management (MM) protocol layer of selection of a new cell or a change of system information of a current camping cell.
14. The method of claim 11 , wherein the MS continues to operate in the unlicensed communication network via the unlicensed radio after performing the instant wakeup.
15. The method of claim 11 , wherein when the MS has not stored the information of the camping cell, the MS initiating normal licensed cell selection procedures.