Mobile telephone intrasystem and intersystem enhanced handoff method and apparatus for limiting trunk switching connections
First Claim
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1. A method for minimizing tandem trunk connections as a result of a succession of handoffs of a mobile radiotelephone in a cellular telephone system,comprising the steps of:
- including with an MTSO an available connection list of trunk connections to other MTSOs.compiling a cumulative tandem connection list of successive MTSOs connected in tandem in a succession of consecutive handoffs of a continuous cell of a mobile radiotelephone,comparing the available connection list of a target MTSO in a handoff with the cumulative tandem connection list of a serving MTSO,identifying a pivot MTSO by selecting an MTSO common to both lists that minimizes a number of tandem connections,handoff the mobile radiotelephone to the target MTSO, and directly connect the target MTSO to the pivot MTSO.
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Abstract
A method and apparatus to minimze the number of connecting trunks and MTSOs is operative to minimize the number of tandem MTSOs involved in handing the call by determining if the target MTSO has inter MTSO trunk connections with at least one of the MTSOs in the chain of existing tandem connections that may be utilized to minimize the total number of tandem MTSO connections involved in handling the call. This is operative without the target MTSO being in the direct chain of tandem MTSO connections.
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Citations
9 Claims
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1. A method for minimizing tandem trunk connections as a result of a succession of handoffs of a mobile radiotelephone in a cellular telephone system,
comprising the steps of: -
including with an MTSO an available connection list of trunk connections to other MTSOs. compiling a cumulative tandem connection list of successive MTSOs connected in tandem in a succession of consecutive handoffs of a continuous cell of a mobile radiotelephone, comparing the available connection list of a target MTSO in a handoff with the cumulative tandem connection list of a serving MTSO, identifying a pivot MTSO by selecting an MTSO common to both lists that minimizes a number of tandem connections, handoff the mobile radiotelephone to the target MTSO, and directly connect the target MTSO to the pivot MTSO. - View Dependent Claims (2, 3, 4, 5)
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6. A cellular telephone system, comprising:
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a plurality of mobile telephone switching offices (MTSO), each controlling a plurality of cell sites with antennas for communicating with mobile radiotelephones, communication trunks connected between ones of the mobile telephone switching offices, apparatus for facilitating a handoff of a mobile radiotelephone from one cell site antenna to another cell site antenna and from one MTSO to another MTSO and operative for permitting extended handoffs in which the land connections include a plurality of MTSOs in tandem connection, means for compiling a list of the tandem connections included in a call connection, means for identifying available trunk connections between a target MTSO and MTSOs identified in the list of tandem connections, and means for directly establishing a trunk connection between the target MTSO and a pivot MTSO to minimize the number of tandem connections and disconnecting a portion of the trunk connection of the MTSOs included in the list of the tandem connections. - View Dependent Claims (7, 8, 9)
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Specification