05175867 is referenced by 262 patents and cites 11 patents.

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 threshold. In addition, neighboring base stations monitor the signal strength of neighboring mobile stations and request that a neighboring mobile station be handed off when that signal strength reaches a predetermined level. Thus, a handoff request may come from the serving base station because of a poor call connection or from a neighboring base station because of a possible strong call connection.

Title
Neighbor-assisted handoff in a cellular communications system
Application Number
7/670237
Publication Number
5175867
Application Date
March 15, 1991
Publication Date
December 29, 1992
Inventor
Claes Andersson
Stockholm
SE
Anna M Wejke
Stockholm
SE
Agent
Burns Doane Swecker & Mathis
Assignee
Telefonaktiebolaget L M Ericsson
SE
IPC
H04Q 9/00
H04Q 7/00
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