Patent ID: 6137783
Filing Date: 2000-10-24
Classification: H04B,H04L,H04W

Abstract:
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.