Apparatus and method for selecting a handoff base station in a wireless network
First Claim
1. For use in a wireless mobile station capable of communicating with a wireless network, an apparatus for selecting at least one target base station for a handoff of said wireless mobile station, said apparatus comprising:
- a handoff controller capable of selecting said at least one target base station based on pilot signal strength information of at least two candidate base stations and one of;
a location of said wireless mobile station;
a velocity of said wireless mobile station; and
a direction of motion of said wireless mobile station,wherein said handoff controller is capable of calculating a distance of said wireless mobile station to at least one candidate base station and creating a preferential order of candidate base stations to which to hand off said wireless mobile station based on said pilot strength information of said at least one target base station and position location information of said wireless mobile station.
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Accused Products
Abstract
An apparatus and method is disclosed for selecting a handoff target base station in a wireless network. The apparatus comprises a handoff controller within a wireless mobile station that selects an optimal target base station for handoff based on pilot signal strength measurements of at least two candidate base stations and one of: a location of the wireless mobile station, a velocity of the wireless mobile station, and a direction of motion of the wireless mobile station. The present invention uses more than just pilot strength measurements to select an optimal target base station for handoff. Incorporating position location information in the handoff decision causes the handoff decision to be more reliable. This reduces the number of unnecessary handoffs and results in better system performance.
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Citations
20 Claims
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1. For use in a wireless mobile station capable of communicating with a wireless network, an apparatus for selecting at least one target base station for a handoff of said wireless mobile station, said apparatus comprising:
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a handoff controller capable of selecting said at least one target base station based on pilot signal strength information of at least two candidate base stations and one of; a location of said wireless mobile station; a velocity of said wireless mobile station; and a direction of motion of said wireless mobile station, wherein said handoff controller is capable of calculating a distance of said wireless mobile station to at least one candidate base station and creating a preferential order of candidate base stations to which to hand off said wireless mobile station based on said pilot strength information of said at least one target base station and position location information of said wireless mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless mobile station comprising:
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an apparatus for selecting at least one target base station for a handoff of said wireless mobile station, said apparatus comprising; a handoff controller capable of selecting said at least one target base station based on pilot signal strength information of at least two candidate base stations and one of; a location of said wireless mobile station; a velocity of said wireless mobile station; and a direction of motion of said wireless mobile station, wherein said handoff controller is capable of calculating a distance of said wireless mobile station to at least one candidate base station and creating a preferential order of candidate base stations to which to hand off said wireless mobile station based on said pilot strength information of said at least one target base station and position location information of said wireless mobile station. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. For use in a wireless mobile station in a wireless network capable of communicating with wireless mobile stations located in a coverage area of the wireless network, a method for selecting at least one target base station for a handoff of a wireless mobile station, said method comprising the steps of:
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receiving within a handoff controller within said wireless mobile station pilot signal strength information of at least two candidate base stations; receiving within said handoff controller one of;
a location of said wireless mobile station, a velocity of said wireless mobile station, and a direction of motion of said wireless mobile station;selecting said at least one target base station based on said pilot signal strength information of said at least two candidate base stations and one of;
said location of said wireless mobile station, said velocity of said wireless mobile station, and said direction of motion of said wireless mobile station;calculating in said handoff controller a distance of said wireless mobile station to at least one candidate base station; and creating a preferential order of candidate base stations to which to hand off said wireless mobile station based on said pilot strength information of said at least two candidate base stations and said position location of said wireless mobile station. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification