Method and apparatus for selecting a cellular system for communication with a cellular telephone in a roaming area
First Claim
1. A method for selecting a cellular system for communication with a cellular telephone in a roaming area, said cellular telephone having a home cellular system in a home service area, said method comprising the steps of:
- said cellular telephone transmitting a system access message to a default cellular system;
when the default cellular system that receives the system access message is a visited cellular system in the roaming area and the cellular telephone is not registered with the visited cellular system, said visited cellular system registering the presence of the cellular telephone in the roaming area with the home cellular system;
said home cellular system sending a response including a selection indication to the cellular telephone through the visited cellular system, said selection indication containing selection information for controlling selection of a cellular system for communication with said cellular telephone in the roaming area, wherein said selection information includes one of a negative SID indication, and a retune indication; and
said cellular telephone selecting a cellular system for communication in the roaming area in accordance with said one of the negative SID indication and the retune indication.
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Accused Products
Abstract
Methods and apparatus for selecting a system for communication with a personal station, such as a cellular telephone or a PCS station, in a roaming area. The personal station transmits a system access message to a default system. When the default system that receives the system access message is a visited system in the roaming area and the personal station is not registered with the visited system, the visited system registers the presence of the personal station in the roaming area with a home system for the personal station. The home system sends a response including a selection indication to the personal station through the visited system. The selection indication contains selection information for controlling selection of a system for communication with the personal station in the roaming area. The personal station selects a system for communication in the roaming area in accordance with the selection information.
94 Citations
10 Claims
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1. A method for selecting a cellular system for communication with a cellular telephone in a roaming area, said cellular telephone having a home cellular system in a home service area, said method comprising the steps of:
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said cellular telephone transmitting a system access message to a default cellular system; when the default cellular system that receives the system access message is a visited cellular system in the roaming area and the cellular telephone is not registered with the visited cellular system, said visited cellular system registering the presence of the cellular telephone in the roaming area with the home cellular system; said home cellular system sending a response including a selection indication to the cellular telephone through the visited cellular system, said selection indication containing selection information for controlling selection of a cellular system for communication with said cellular telephone in the roaming area, wherein said selection information includes one of a negative SID indication, and a retune indication; and said cellular telephone selecting a cellular system for communication in the roaming area in accordance with said one of the negative SID indication and the retune indication. - View Dependent Claims (2, 3)
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4. A method for selecting a system for communication with a personal station in a roaming area, said personal station having a home system in a home service area, said method comprising the steps of:
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said personal station transmitting a system access message to a default system; when the default system that receives the system access message is a visited system in the roaming area and the personal station is not registered with the visited system, said visited system registering the presence of the personal station in the roaming area with the home system; said home system sending a response including a selection indication to the personal station through the visited system, said selection indication containing selection information for controlling selection of a system for communication with said personal station in the roaming area, wherein said selection information includes one of a negative SID indication, and a retune indication and said personal station selecting a system for communication in the roaming area in accordance with said one of the negative SID indication and the retune indication. - View Dependent Claims (5, 6, 7)
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8. In a cellular telephone associated with a home cellular system in a home service area, apparatus for selecting a cellular system for communication with the cellular telephone in a roaming area comprising:
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means for transmitting a system access message to a default cellular system; means for receiving a response including a selection indication from the default cellular system, said selection indication containing selection information for controlling selection of a cellular system for communication with said cellular telephone in the roaming area, wherein said selection information includes one of a negative SID indication, and a retune indication; and means for selecting a cellular system for communication in the roaming area in accordance with said one of the negative SID indication and the retune indication. - View Dependent Claims (9, 10)
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Specification