Handover control method, mobile station and communication control apparatus
First Claim
1. A handover control method used in a mobile communication system which includes communication apparatuses having functions of base stations, a mobile station and a communication control apparatus which controls connections between said communication apparatuses and said mobile station, wherein said mobile station switches a communication apparatus of a communication partner to another communication apparatus when a communication quality value between said communication apparatus of said communication partner and said mobile station falls below a first threshold which is better than a limitation value by which communication is available, said handover control method comprising the steps of:
- said communication control apparatus;
receiving a handover history from the mobile station, said handover history identifying origination and destination base stations of previous successful handovers of the mobile station;
selecting at least a handover destination candidate communication apparatus from among communication apparatuses surrounding said communication apparatus of said communication partner based at least on the received handover history;
reserving wireless resources of said at least a handover destination candidate communication apparatus which is selected;
notifying said mobile station of a handover destination candidate communication apparatus for which wireless resources are reserved in said at least a handover destination candidate communication apparatus; and
said mobile station switching said communication apparatus of said communication partner to said handover destination candidate communication apparatus which is notified by said communication control apparatus when said communication quality value falls below said first threshold.
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Accused Products
Abstract
When a handover standby threshold falls below a received power of perch channel from a base station 150-1 of a communication partner, a mobile station 110 sends a handover standby operation request to a base station control apparatus 130, and notifies of history of movement of itself and receives powers of perch channels from base stations 150-2–150-4 surrounding the communication partner (mobile station information). The base station control apparatus 130 compares the mobile station information with history of mobile station information so that a handover destination candidate base station is selected and sent to the mobile station 110. The mobile station 110 switches the communication partner to the handover destination candidate base station when received power of the perch channel from the base station 150-1 falls below a handover threshold.
25 Citations
10 Claims
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1. A handover control method used in a mobile communication system which includes communication apparatuses having functions of base stations, a mobile station and a communication control apparatus which controls connections between said communication apparatuses and said mobile station, wherein said mobile station switches a communication apparatus of a communication partner to another communication apparatus when a communication quality value between said communication apparatus of said communication partner and said mobile station falls below a first threshold which is better than a limitation value by which communication is available, said handover control method comprising the steps of:
said communication control apparatus; receiving a handover history from the mobile station, said handover history identifying origination and destination base stations of previous successful handovers of the mobile station; selecting at least a handover destination candidate communication apparatus from among communication apparatuses surrounding said communication apparatus of said communication partner based at least on the received handover history; reserving wireless resources of said at least a handover destination candidate communication apparatus which is selected; notifying said mobile station of a handover destination candidate communication apparatus for which wireless resources are reserved in said at least a handover destination candidate communication apparatus; and said mobile station switching said communication apparatus of said communication partner to said handover destination candidate communication apparatus which is notified by said communication control apparatus when said communication quality value falls below said first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication control apparatus in a mobile communication system which includes communication apparatuses having functions of base stations, a mobile station and said communication control apparatus which controls connections between said communication apparatuses and said mobile station, said communication control apparatus comprising:
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a switching part for allowing said mobile station to switch a communication apparatus of a communication partner to another communication apparatus when a communication quality value between, said communication apparatus of said communication partner and said mobile station falls below a first threshold which is better than a limitation value by which communication is available, the switching part having; a part for receiving a handover history from the mobile station, said handover history identifying origination and destination base stations of previous successful handovers of the mobile station a part for selecting at least a handover destination candidate communication apparatus from among communication apparatuses surrounding said communication apparatus of said communication partner based at least on the received handover history; a part for reserving wireless resources of said at least a handover destination candidate communication apparatus which is selected; and a part for notifying said mobile station of a handover destination candidate communication apparatus for which wireless resources are reserved in said at least a handover destination candidate communication apparatus.
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Specification