Call set-up on 800 MHz analog voice channel from 1900 MHZ digital control channel
First Claim
1. In a cellular network having a first cluster of base stations serving a first group of mobile stations over digital RF channels and a second cluster of base stations, collocated with said first cluster, for serving a second group of mobile stations over analog RF channel;
- , wherein some of said base stations in said second cluster have cells which overlap with cells of said first cluster, a method of setting up a call on an analog voice channel of a base station of said second cluster while a mobile station is being served by a digital control channel of a serving base station in said first cluster, comprising the steps of;
receiving at said serving base station of said first cluster, a mobile station service code indicative of an analog voice channel preference;
forwarding said mobile station service code to a mobile switching controller;
instructing said serving base station to set up a call with said mobile station on a digital traffic channel;
determining if a cell of a base station from said second cluster is overlapping a cell which corresponds to said serving base station;
if an overlapping cell is available, determining if an analog voice channel is available on said overlapping cell; and
if an analog voice channel is available, forcing said serving base station and said mobile station to engage in an inter-cell handoff to said analog voice channel on said overlapping cell.
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Accused Products
Abstract
In a cellular network having a first cluster of base stations serving a first group of mobile stations over digital RF channels and a second cluster of base stations, collocated with said first cluster, for serving a second group of mobile stations over analog RF channels, wherein some of the base stations in the second cluster have cells which overlap with cells of the first cluster, a method is disclosed for setting up a call on an analog voice channel of a base station of the second cluster while a mobile station is being served on a digital control channel of a base station in the first cluster.
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Citations
18 Claims
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1. In a cellular network having a first cluster of base stations serving a first group of mobile stations over digital RF channels and a second cluster of base stations, collocated with said first cluster, for serving a second group of mobile stations over analog RF channel;
- , wherein some of said base stations in said second cluster have cells which overlap with cells of said first cluster, a method of setting up a call on an analog voice channel of a base station of said second cluster while a mobile station is being served by a digital control channel of a serving base station in said first cluster, comprising the steps of;
receiving at said serving base station of said first cluster, a mobile station service code indicative of an analog voice channel preference; forwarding said mobile station service code to a mobile switching controller; instructing said serving base station to set up a call with said mobile station on a digital traffic channel; determining if a cell of a base station from said second cluster is overlapping a cell which corresponds to said serving base station; if an overlapping cell is available, determining if an analog voice channel is available on said overlapping cell; and if an analog voice channel is available, forcing said serving base station and said mobile station to engage in an inter-cell handoff to said analog voice channel on said overlapping cell. - View Dependent Claims (2, 3, 4, 5, 6)
- , wherein some of said base stations in said second cluster have cells which overlap with cells of said first cluster, a method of setting up a call on an analog voice channel of a base station of said second cluster while a mobile station is being served by a digital control channel of a serving base station in said first cluster, comprising the steps of;
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7. In a cellular network having a first cluster of base stations serving a first group of mobile stations over digital RF channels and a second cluster of base stations, collocated with said first cluster, for serving a second group of mobile stations over analog RF channels, wherein some of said base stations in said second cluster have cells which overlap with cells of said first cluster, a method of setting up a call on an analog voice channel of a base station of said second cluster while a mobile station is being served by a digital traffic channel of a serving base station in said first cluster, comprising the steps of:
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receiving at said serving base station a mobile station service code indicative that said mobile station is requesting an analog voice channel; forwarding said mobile station service code to a mobile switching controller; determining if a cell of a base station from said second cluster is overlapping a cell which corresponds to said serving base station; if an overlapping cell is available, determining if an analog voice channel is available on said overlapping cell; and if an analog voice channel is available, forcing said mobile station and said serving base station to engage in an inter-cell handoff to said analog voice channel from said digital traffic channel. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of operating a cellular telecommunications network having a plurality of base stations and wherein a cell is associated with each base station, wherein the network is capable of at least two modes of communication, comprising the steps of:
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operating a first set of base stations to communicate in a first mode; operating a second set of base stations to communicate in a second mode; transmitting from a mobile station to a first base station in the first set of base stations a request to communicate in the second mode; detecting whether a second base station in the second set of base stations has a cell associated therewith which overlaps the cell associated with the first base station; and if such overlap is detected, forcing the first base station and the mobile station to engage in an inter-cell hand off to the second base station. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification