Method and system for effecting handoff in a cellular communication system
First Claim
1. A method of handing off an on-going communication of a mobile unit from a serving cell to a neighboring cell of a cellular communication system, comprising:
- handing off the communication to a neighboring cell at times when the scanning receiver signal strength of the mobile unit at the neighboring cell is greater than a determined cell selection threshold for the neighboring cell; and
determining the cell selection threshold using the current attenuation level of the mobile unit, a minimum permissible attenuation level permitted by the serving cell, and a minimum permissible attenuation level permitted by the neighboring cell.
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Accused Products
Abstract
A method and system for handing off an on-going communication from a serving cell to a neighboring cell of a cellular communication system having scanning receivers associated with each base transceiver station. A dynamic threshold is calculated for effecting the handoff in accordance with various operating conditions. The current mobile minimum attentuation level, (MT) the minimum permissible attenuation level of a serving (MS) cell and a neighboring cell (MN), together with the RF signal strength of the mobile unit at the neighboring cell (RSSI-NBR) and the serving cell (RSSI-SRV) are used in calculating a dynamic threshold (RSSI-THP).
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Citations
22 Claims
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1. A method of handing off an on-going communication of a mobile unit from a serving cell to a neighboring cell of a cellular communication system, comprising:
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handing off the communication to a neighboring cell at times when the scanning receiver signal strength of the mobile unit at the neighboring cell is greater than a determined cell selection threshold for the neighboring cell; and determining the cell selection threshold using the current attenuation level of the mobile unit, a minimum permissible attenuation level permitted by the serving cell, and a minimum permissible attenuation level permitted by the neighboring cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for effecting handoff of a mobile telephone communication from a serving cell to a neighboring cell of a cellular communication system having a plurality of mobile switching centers coupled to a telephone network, a plurality of base station controllers coupled to each mobile switching center, and a plurality of base transceiver stations, each defining an individual cell, and a plurality of scanning receivers for each base transceiver station for scanning neighboring cells, the system comprising:
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means for handing off the communication to a neighboring cell at times when the scanning receiver signal strength of the mobile unit at the neighboring cell is greater than a cell selection threshold for the neighboring cell; and means for determining the cell selection threshold in accordance with a current attenuation level of the mobile unit, as compared to a minimum attenuation level permitted by the serving cell and a minimum attenuation level permitted by the neighboring cell. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification