A handoff system where handoff requests are initiated not only by a home or serving base station, but also by neighboring base stations. As in conventional handoff, a serving base station may initiate a handoff request when the signal strength of one of its mobile stations falls below a predetermined...http://www.google.de/patents/US5175867?utm_source=gb-gplus-sharePatent US5175867 - Neighbor-assisted handoff in a cellular communications system
