Method and an apparatus for handing off mobile station from a first to a second channel in a mobile communication system
First Claim
1. In a mobile communication system, a method for handing off a mobile station from a first channel on a serving base station to a second channel on a target base station, transmissions from the mobile station occurring on first time slot on the first channel and on a second time slot on the second channel, comprising the steps of:
- determining, at the target base station prior to communication over the second channel, a relative time offset between the first time slot and the second time slot, andshifting the transmission time slot of the mobile station by the determined relative time offset to communicate on the second channel.
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Abstract
In a mobile communication system, a method and an apparatus for handing off a mobile station from a first channel on a serving base station to a second channel on a target base station, the mobile station transmitting at a first transmission phase on the first channel, the second channel being ready to take over the communication with the mobile station transmitting at a second transmission phase. A device for determining a time offset is provided in the target base station and is adapted to tune in to the mobile station for determining, prior to a handoff, the time offset between the first transmission phase and the second transmission phase. Also, a device is provided for shifting, upon handoff, the transmission phase of the mobile station by the determined time offset relative to the first transmission phase.
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Citations
10 Claims
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1. In a mobile communication system, a method for handing off a mobile station from a first channel on a serving base station to a second channel on a target base station, transmissions from the mobile station occurring on first time slot on the first channel and on a second time slot on the second channel, comprising the steps of:
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determining, at the target base station prior to communication over the second channel, a relative time offset between the first time slot and the second time slot, and shifting the transmission time slot of the mobile station by the determined relative time offset to communicate on the second channel. - View Dependent Claims (2, 3, 4, 5)
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6. In a mobile communication system, an apparatus for handing off a mobile station from a first channel on a serving base station to a second channel on a target base station, the mobile station transmitting on a first time slot on the first channel and transmitting on a second time slot on the second channel, comprising:
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means, provided in the target base station for determining, prior to communication over the second channel, a relative time offset between the first time slot and the second time slot, and means for shifting, upon handoff, the transmission time slot of the mobile station by the relative time offset to communicate on the second channel. - View Dependent Claims (7, 8, 9, 10)
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Specification