Method for processing hard handoff in a digital communication sy

Details Method for processing hard handoff in a digital communication sy Method for processing hard handoff in a digital communication sy

1998-12-07

2000-10-31

Vo, Nguyen

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455442, 455443, 455439, H04Q 720

Patent

active

061415545

ABSTRACT:
Method for processing hard handoff to prevent unnecessary frequent hard handoffs using specific parameters after the first handoff is performed. The method includes the steps of establishing a Guard.sub.-- Time period during which handoff is not performed when a mobile station moves slowly in an area in which the cell coverages of the serving and target base stations are overlapped; and establishing a Guard.sub.-- Level value so that handoff is performed independent of the Guard.sub.-- Time if the strength of the radio wave for the moving mobile station is less than the Guard.sub.-- Level during said Guard.sub.-- Time. The Guard Time period prevents hard handoff even when a base station controller receives a request for handoff based on information received from the moving mobile station. Although the base station controller prevents the hard handoff dependent on the Guard.sub.-- Time, the base station controller permits soft handoff and softer handoff to occur normally. The Guard.sub.-- Time and Guard.sub.-- Level are set up according to the base station, the base station controller and the characteristics of the coverage area. The Guard.sub.-- Time is set up by a system-operator and the Guard.sub.-- Level is used in relation with the value of T.sub.-- DROP.

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