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Method and apparatus for performing idle mode reacquisition and handoff in an asynchronous communication system
| Details |
Inventors: New, Wen Jing; Levin, Mark; Hughes, Robbin D.;
Assignee: Qualcomm, Incorporated (San Diego, CA)
Primary Examiner: Vo; Nguyen T.
Assistant Examiner: Nguyen; Simon
Attorney, Agent or Firm: Wadsworth; Philip R., Brown; Charles D., Pappas; George C.
Techniques to efficiently process paging channels in an asynchronous wireless communication system. In one aspect, if the base stations are not synchronized with each other and a remote terminal's designated page time is different from base station to base station, the remote terminal can wake up based on the earliest base station in a reacquisition search list that includes candidate base stations to which the remote terminal may be handed off. In another aspect, the criteria to select base stations for evaluation as reacquisition targets may be based on the received power of the base stations as well as their timing, both of which may be made relative to that of a preferred base station. In yet another aspect, the remote terminal may wake up multiple times in a particular paging cycle (i.e., a frame cycle or a DRX cycle) if there are one or more candidates base station to which the remote terminal may be handed off. |
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DETAILED DESCRIPTION The invention provides various techniques to efficiently process paging channels in an asynchronous wireless communication system.
In accordance with one aspect of the invention, if the base stations are not synchronized with each other and a remote terminal's assigned paging time is different from base station to base station (from the remote terminal's perspective), the remote terminal wakes up based on the earliest base station (from the remote terminal's point of view) in a "reacquisition search" list.
This list includes the preferred base station as well as neighboring base stations to which the remote terminal may be handed off at a subsequent wake-up interval.
This allows the remote terminal to perform reacquisition searches and reacquisition handoff and avoid missing pages.
In accordance with another aspect of the invention, the criteria to select base stations for the reacquisition search list may be based on the base station timing as well as the measured signal strength of the base stations, both of which may be made relative to that of the preferred base station.
In an embodiment, if, from the remote terminal's point of view, a neighboring base station's timing is in close proximity of the preferred base station's timing, and if the neighboring base station's signal is measured strong enough before entering the inactive state, then this neighboring base station is added to the reacquisition search list, together with the preferred base station.
The next scheduled wake-up time (or active state) is then based on the earliest of the preferred and neighboring base stations in the list.
In this manner, the preferred and neighboring base stations will be searched and evaluated, and the paging information from the base station with strongest signal is decoded, at the next active state.
Otherwise, if a neighboring base station's timing is outside the proximity of the preferred base station's timing, and if the neighboring base station's signal is measured sufficiently stronger than the preferred base station before entering the inactive state, then this neighboring base station is added to the reacquisition search list, together with the preferred base station
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