Method and arrangement for reducing the number of handoff requests in a cellular mobile communications system
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United States of America Patent
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Jul 25, 1995
Grant Date -
N/A
app pub date -
Jul 19, 1993
filing date -
Jul 17, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In order to effectively control a time interval of issuing a handoff request from a land site in a mobile communications system, a strength of a signal which is transmitted from a mobile unit located in a service area of said land site, is measured at the land side. A level crossing rate is measured based on the signal transmitted from the mobile unit. A first handoff request is generated if the signal strength falls below a predetermined handoff threshold. Following this, a timer is rendered active for counting an elapsed time after the first handoff request is generated. If the signal strength is detected below the predetermined handoff threshold, a time interval is determined based on the level crossing rate. The relationship between the time interval and the level crossing rate has been previously determined. Thereafter, a second handoff request is generated if the time interval determined in the above exceeds the elapsed time. subsequently, the timer is reset and then the above operations are repeated.
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