Compensation for mobile assisted handoff measurement inaccuracies
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Dec 31, 1996
filing date -
Dec 31, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A mobile assisted handoff (MAHO) signal strength measurement is ordered by the cellular telephone system for not only the currently used traffic channel and the reference (control) channels of neighboring cells, but also for the reference (control) channel of the current cell. These MAHO measurements are reported to the system where a compensation factor is determined which accounts for the use of different modulation schemes and or hyperbands by system traffic and control channels. The compensation factor is calculated by subtracting the MAHO measurement made on the reference channel of the current cell from the MAHO measurement made on the traffic channel of the current cell. The calculated compensation factor is then added to each of the MAHO measurements made on the reference channels for each of the neighboring cells to generate compensated signal strength measurements. The compensated measurements are then compared to the MAHO measurement made on the traffic channel (in view of a predetermined hysteresis) to determine whether a handoff to one of the neighboring cells should be made.
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