Method of selecting a handoff target in a cellular communication system
First Claim
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1. In a cellular communication system, a method of selecting a target cell for a handoff, the method comprising the steps of:
- A) excluding as potential target cells cells which are not adjacent to a serving cell and which do not have an antenna directionally opposing a directional antenna of the serving cellB) identifying the reported RSSI values for potential target cells;
C) calculating a power budget value based upon the reported RSSI values for each of the potential target cells; and
,D) selecting as the target cell a potential target cell providing the largest relative magnitude power budget value.
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Abstract
In a cellular radio-telephone system (50), a method of selecting an appropriate handoff target where the timing advance of a mobile has exceeded a timing advance threshold, the bit error rate has risen above a BER theshold, or the signal level has fallen below an RSSI threshold. The method includes discarding signal measurements of inappropriate base sites or base sites at excessive distance and performing calculations on the remaining measurements to select an appropriate handoff target.
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Citations
10 Claims
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1. In a cellular communication system, a method of selecting a target cell for a handoff, the method comprising the steps of:
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A) excluding as potential target cells cells which are not adjacent to a serving cell and which do not have an antenna directionally opposing a directional antenna of the serving cell B) identifying the reported RSSI values for potential target cells; C) calculating a power budget value based upon the reported RSSI values for each of the potential target cells; and
,D) selecting as the target cell a potential target cell providing the largest relative magnitude power budget value. - View Dependent Claims (2, 3, 4, 5)
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6. In a cellular communication system, an apparatus for selecting a target cell for a handoff, the apparatus comprising:
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A) means for excluding as potential target cells cells which are not adjacent to a serving cell and which do not have an antenna directionally opposing a directional antenna of the serving cell; B) means for identifying the reported RSSI values of potential target cells; C) means for calculating a power budget value based upon the reported RSSI values for each of the potential target cells; and
,D) means for selecting as the target cell a potential target cell providing the largest relative magnitude power budget value. - View Dependent Claims (7, 8, 9, 10)
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Specification