System and method for reduced network information handovers
First Claim
1. A handoff system for controlling mobile terminal handoffs between network systems, said handoff system comprising:
- a first base station within a first network system, a mobile terminal being in wireless communication with said first base station;
a second base station within a second network system;
a mobile packet data switch connected to said first base station, said mobile packet data switch containing mobility management information about said mobile terminal;
packet switching means, connected to said first and second base stations and said mobile packet data switch, said first and second base stations and said mobile packet data switch intercommunicating through said packet switching means;
distance measuring means for measuring the distance of said mobile terminal from said first base station and, when said mobile terminal becomes outside the range of said first network system, measuring the distances of said mobile terminal from a second and a plurality of other network systems adjacent said first network system, the closest of said network systems being said second network system, andhandoff means for handing off said mobile terminal from said first base station within said first network system to said second base station within said second network system, said mobility management information about said mobile terminal remaining within said mobile packet data switch, said second network system accessing said mobility management information about said mobile terminal at said mobile packet data switch through said packet switching means.
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Accused Products
Abstract
A system and method for reducing or eliminating the transference of mobile terminal mobility management information caused by temporary signal interferences blocking communications is disclosed. When the distance of a mobile terminal from a base station servicing a first network system exceeds a threshold value, the mobile terminal'"'"'s distances from other base stations (servicing other network systems) are determined and the shortest distance, corresponding to a second network system, is selected and control transferred. The mobility management information for the mobile terminal, however, resident within the first network system, remains within the first network system after the control transference, the information being accessible by the second network system via a packet switch interconnecting the first and second network systems.
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Citations
26 Claims
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1. A handoff system for controlling mobile terminal handoffs between network systems, said handoff system comprising:
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a first base station within a first network system, a mobile terminal being in wireless communication with said first base station; a second base station within a second network system; a mobile packet data switch connected to said first base station, said mobile packet data switch containing mobility management information about said mobile terminal; packet switching means, connected to said first and second base stations and said mobile packet data switch, said first and second base stations and said mobile packet data switch intercommunicating through said packet switching means; distance measuring means for measuring the distance of said mobile terminal from said first base station and, when said mobile terminal becomes outside the range of said first network system, measuring the distances of said mobile terminal from a second and a plurality of other network systems adjacent said first network system, the closest of said network systems being said second network system, and handoff means for handing off said mobile terminal from said first base station within said first network system to said second base station within said second network system, said mobility management information about said mobile terminal remaining within said mobile packet data switch, said second network system accessing said mobility management information about said mobile terminal at said mobile packet data switch through said packet switching means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling handoffs of a mobile terminal between network systems, said method comprising the steps of:
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measuring the position of said mobile terminal in relation to a first network system; calculating the distance of said mobile terminal from a first base station within said first network system, mobility management information about said mobile terminal being stored within said first network system; determining if said distance is greater than a distance threshold associated with said first network system; if said distance exceeds said distance threshold, calculating a plurality of other distances of said mobile terminal from a plurality of other base stations in a plurality of other network systems, the closest of said other distances from the other network systems being a second base station in a second network system; selecting said second base station of said second network system for handoff; and handing off said mobile terminal from said first base station within said first network system to said second base station within said second network system, said mobility management information about said mobile terminal remaining within said first network system. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification