Communication transfer in a cellular radiotelephone system
First Claim
1. In a cellular radio telephone communication system requiring a communication transfer from a source or serving base-site to a selected target base-site, said base-sites operating under the direction and control of a mobile telephone switching office (MTSO), a method for performing mobile unit handoffs, comprising the steps of:
- directing the target base-site to tune a transceiver circuit to and monitor the mobile unit'"'"'s in progress call on the serving base-site'"'"'s channel frequency;
the target base-site directing the mobile unit to tune to a selected target base-site channel frequency;
the target base-site re-tunning said transceiver circuit to the selected target channel frequency to commence communication with the mobile unit; and
releasing the serving base-site channel upon arrival of the mobile unit onto the selected target channel frequency.
1 Assignment
0 Petitions
Accused Products
Abstract
During the handoff of a mobile unit (225) between a serving or source base-site (200) and a selected target base-site, (205 or 210) the target base-site (205 or 210) is directed to tune to and monitor the mobile unit'"'"'s in progress call on a serving base-site channel frequency in order to verify target cell selection immediately before the handoff. Thereafter, the mobile unit (225) is directed to tune to a selected target base-site channel by the target base-site. Next, the target base-site (205 or 210) re-tunes itself to the selected target channel frequency and continues to transmit. Upon the arrival of the mobile unit onto the selected target channel, the serving base-site channel is released.
39 Citations
18 Claims
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1. In a cellular radio telephone communication system requiring a communication transfer from a source or serving base-site to a selected target base-site, said base-sites operating under the direction and control of a mobile telephone switching office (MTSO), a method for performing mobile unit handoffs, comprising the steps of:
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directing the target base-site to tune a transceiver circuit to and monitor the mobile unit'"'"'s in progress call on the serving base-site'"'"'s channel frequency; the target base-site directing the mobile unit to tune to a selected target base-site channel frequency; the target base-site re-tunning said transceiver circuit to the selected target channel frequency to commence communication with the mobile unit; and releasing the serving base-site channel upon arrival of the mobile unit onto the selected target channel frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a cellular radio telephone communication system requiring a communication transfer from a source or serving base-site to a target base-site, said base-sites operating under the direction and control of a mobile telephone switching office (MTSO), a method for performing mobile unit handoffs, comprising the steps of:
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determining that a mobile unit handoff is required; identifying a target base-site to hand the mobile unit to; directing the target base-site to tune a transceiver circuit to a serving base-site channel frequency and monitor the mobile unit'"'"'s in progress call to verify signal quality; and aborting the handoff when the target base-site cannot provide the mobile unit with quality service;
elsethe target base-site directing the mobile unit, via said transceiver circuit, to tune to a selected target base-site channel frequency different from the serving base-site channel frequency; the target base-site re-tunning said transceiver circuit to the selected target channel frequency to commence communication with the mobile unit; and releasing the serving base-site channel upon arrival of the mobile unit onto the selected target base-site channel. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A cellular radiotelephone system requiring a communication transfer from a serving base-site to a selected target base-site, said base-sites operating under the direction and control of a mobile telephone switching office (MTSO), comprising:
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means, for directing the target base-site to tune a target channel transceiver circuit to and monitor the mobile unit'"'"'s in progress call on a serving base-site channel to verify signal quality; said target channel transceiver circuit, in communication with the mobile unit via the serving base-site channel, for directing the mobile unit to tune to a selected target base-site channel; means, coupled to the target base-site, for directing the target base-site to re-tune said target channel transceiver circuit to the selected target channel after transmitting directions to the mobile unit; and means, coupled to the serving base-site, for releasing the serving base-site channel upon arrival of the mobile unit onto the selected target channel. - View Dependent Claims (17)
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18. A cellular radiotelephone system requiring a communication transfer from a serving base-site to a selected target base-site, said base-sites operating under the direction and control of a mobile telephone switching office (MTSO), comprising:
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means for determining that a mobile unit handoff is required; means for identifying a target base-site to hand the mobile unit to; means, coupled to the serving and the target base-sites, for switching audio to both the serving and the target base-sites; means, coupled to the target base-site, for directing the target base-site to tune a target channel transceiver circuit to and monitor the mobile unit'"'"'s in progress call on a serving base-site channel to verify signal quality; said target channel transceiver circuit, in communication with the mobile unit via the serving base-site channel, for directing the mobile unit to tune to a selected target base-site channel different from the serving base-site channel; means, coupled to the target base-site, for directing the target base-site to re-tune said target channel transceiver circuit to the selected target channel after transmitting directions to the mobile unit; and means, coupled to the serving base-site, for releasing the serving base-site channel upon the arrival of the mobile unit onto the selected target base-site channel.
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Specification