Channel reservation and power control for improved handoff performance
First Claim
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1. A method of handing off on-going communication from a serving cell to a target cell of a cellular telecommunication network, said method comprising:
- generating a first plurality of communication channels having a first power level at a base station of each of the serving and target cells;
generating a second plurality of communication channels having a second power level higher than the first power level at the base station of each of the serving and target cells;
generating a handoff request at either the base station of the serving cell or the mobile unit during an on-going communication over one of the first communication channels of the serving cell in response to a decrease in the quality of reception of one of the first plurality of communication channels;
switching the on-going communication to one of the second plurality of communication channels in the serving cell having the second power level in response to the handoff request; and
switching the on-going communication from said one of the second plurality of communication channels of the serving cell to one of the first plurality of communication channels of the target cell.
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Abstract
A method and system for handing over on-going communications to a target cell including a plurality of low power channels, for handling ongoing calls, and a plurality of higher power channels for handoff. The ongoing call is switched from a low to a higher power channel upon receiving a handoff request. The on-going call is using the higher power channel until a determination is made that the handoff is necessary or unnecessary. The quality of reception of the serving cell and target cell is compared to determine the necessity.
66 Citations
13 Claims
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1. A method of handing off on-going communication from a serving cell to a target cell of a cellular telecommunication network, said method comprising:
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generating a first plurality of communication channels having a first power level at a base station of each of the serving and target cells; generating a second plurality of communication channels having a second power level higher than the first power level at the base station of each of the serving and target cells; generating a handoff request at either the base station of the serving cell or the mobile unit during an on-going communication over one of the first communication channels of the serving cell in response to a decrease in the quality of reception of one of the first plurality of communication channels; switching the on-going communication to one of the second plurality of communication channels in the serving cell having the second power level in response to the handoff request; and switching the on-going communication from said one of the second plurality of communication channels of the serving cell to one of the first plurality of communication channels of the target cell. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for handing over an on-going communication from a serving cell to a target cell of a cellular communication network having a plurality of base station subsystems (BSS), the BSS portions comprising:
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means for generating a first plurality of communication channels having a first power level at the BSS of each of the serving and target cells; means for generating a second plurality of communication channels having a second power level higher than the first power level at the BSS of each of the serving and target cells; means for switching the on-going communication to one of the second plurality of communication channels in the serving cell having the second power level in response to a decrease in the quality of reception of said assigned one of the plurality of first channels; means for continuing the on-going communication over said one of the plurality of second channels a sufficient length of time to determine whether the handoff is necessary or unnecessary; means for switching the on-going communication from said one of the plurality of second communication channels of the serving cell to one of the first plurality of communication channels of the serving cell in response to an unnecessary determination; and means for switching the on-going communication from said one of the plurality of second communication channels of the serving cell to said one of the first plurality of communication channels of the target cell at times when the determining means determines that the request is necessary. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification