Method and apparatus for performing idle mode reacquisition and handoff in an asynchronous communication system
First Claim
1. At a terminal in a wireless communication system, a method for processing a plurality of transmissions from a plurality of transmitters, wherein one transmitter is designated as a preferred transmitter from which messages intended for the terminal may be transmitted, the method comprising:
- receiving the plurality of transmissions from the plurality of transmitters;
determining a received power for each of the plurality of transmitters;
determining a timing associated with each of the plurality of transmitters; and
forming a first list of one or more transmitters to evaluate at a subsequent time period based on the determined received power and timing for the plurality of transmitters.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
-
Citations
25 Claims
-
1. At a terminal in a wireless communication system, a method for processing a plurality of transmissions from a plurality of transmitters, wherein one transmitter is designated as a preferred transmitter from which messages intended for the terminal may be transmitted, the method comprising:
-
receiving the plurality of transmissions from the plurality of transmitters;
determining a received power for each of the plurality of transmitters;
determining a timing associated with each of the plurality of transmitters; and
forming a first list of one or more transmitters to evaluate at a subsequent time period based on the determined received power and timing for the plurality of transmitters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 25)
-
-
23. At a terminal in a wireless communication system, a method for processing a plurality of transmissions from a plurality of base stations, wherein one base station is designated as a preferred base station from which messages intended for the terminal may be transmitted and remaining base stations are designated as neighbor base stations, the method comprising:
-
receiving the plurality of transmissions from the plurality of base stations;
determining a received power for each base station;
determining a timing associated with each base station based on a start of a system frame for the base station, wherein the timing for the plurality of base stations are asynchronous with respect to the timing of the preferred base station;
maintaining a timer for each neighbor base station having received power that exceeds a requisite power level, wherein the timer is indicative of an estimated amount of time the associated neighbor base station is received above the threshold power level; and
forming a list of one or more base stations to evaluate at a subsequent time period based on the received power, the timing, and the timer for the base stations.
-
-
24. A receiver processing unit for use in a wireless communication system, comprising:
-
a receiver operative to receive and process a plurality of transmissions from a plurality of transmitters to generate a plurality of streams of samples;
a power measurement unit coupled to the receiver and operative to receive the plurality of streams of samples and determine a received power for each of the plurality of transmitters;
a demodulator coupled to the receiver and operative to receive the plurality of streams of samples and determine a timing associated with each of the plurality of transmitters; and
a controller coupled to the power measurement unit and the demodulator, the controller operative to form a list of one or more transmitters to evaluate at a subsequent time period based on the received power and timing for the transmitters.
-
Specification