Method for a radiotelephone to search for higher priority networks
First Claim
1. A method for a radiotelephone to search for higher priority public land mobile networks, each network having a plurality of cells for providing radiotelephone service to a radiotelephone within a corresponding geographic area, each cell having a radio communication coverage area established by fixed site base stations, and each base station operable to send messages to radiotelephones, the method comprising the steps of:
- camping the radiotelephone on a cell of a visited public land mobile network;
uniquely identifying the cell;
searching for public land mobile networks with a higher priority than the visited public land mobile network; and
storing a history of those frequencies found during the scanning step that are not of a higher priority public land mobile network, the history being associated with the uniquely identified cell.
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Accused Products
Abstract
A method for a radiotelephone to search for a high priority, home, or home-equivalent public land mobile network (PLMN) includes a first step of camping the radiotelephone on a cell of visited PLMN. A next step includes uniquely identifying the cell. A next step includes searching for PLMNs with a higher priority than the visited PLMN. A next step includes storing a history of those frequencies found that are not of a higher priority PLMN for the uniquely identified cell. Any subsequent searches for frequencies of higher priority PLMNs performed while camped on that cell includes scanning for available frequencies except for those frequencies listed in the history for the uniquely identified cell in which the radiotelephone is camped.
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Citations
20 Claims
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1. A method for a radiotelephone to search for higher priority public land mobile networks, each network having a plurality of cells for providing radiotelephone service to a radiotelephone within a corresponding geographic area, each cell having a radio communication coverage area established by fixed site base stations, and each base station operable to send messages to radiotelephones, the method comprising the steps of:
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camping the radiotelephone on a cell of a visited public land mobile network;
uniquely identifying the cell;
searching for public land mobile networks with a higher priority than the visited public land mobile network; and
storing a history of those frequencies found during the scanning step that are not of a higher priority public land mobile network, the history being associated with the uniquely identified cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for a radiotelephone to search for higher priority public land mobile networks, each network having a plurality of cells for providing radiotelephone service to a radiotelephone within a corresponding geographic area, each cell having a radio communication coverage area established by fixed site base stations, and each base station operable to send messages to radiotelephones, the method comprising the steps of:
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camping the radiotelephone on a cell of a visited public land mobile network;
giving a list of public land mobile networks to the radiotelephone;
uniquely identifying the cell;
searching for public land mobile networks with a higher priority than the visited public land mobile network;
storing a history of those frequencies found that are not of a higher priority public land mobile network for each of a plurality of cells of the visited public land mobile network, the history being associated with each uniquely identified cell; and
scanning for higher priority public land mobile networks except in those frequencies listed in the history for the uniquely identified cell in which the radiotelephone is camped. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for a radiotelephone to search for higher priority public land mobile networks, each network having a plurality of cells for providing radiotelephone service to a radiotelephone within a corresponding geographic area, each cell having a radio communication coverage area established by fixed site base stations, and each base station operable to send messages to radiotelephones, the method comprising the steps of:
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camping the radiotelephone on a cell of a visited public land mobile network;
giving a list of public land mobile networks to the radiotelephone;
uniquely identifying the cell;
searching for public land mobile networks with a higher priority than the visited public land mobile network;
storing an individual history of those frequencies found that are not of a higher priority public land mobile network for each of a plurality of uniquely identified cells of the visited public land mobile network;
scanning for higher priority public land mobile networks except in those frequencies listed in the history for the uniquely identified cell in which the radiotelephone is camped; and
adding any newly found frequencies that are not of a higher priority public land mobile network to any previously found frequencies of the history. - View Dependent Claims (17, 18, 19, 20)
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Specification