Method for a radio telephone to search for higher priority networks
First Claim
1. A method for a radiotelephone to search for higher priority public land mobile networks comprising:
- camping the radiotelephone on a cell of a visited public land mobile network and registering on the 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 while registered on the visited public land mobile network and camped on the uniquely identified cell;
storing a history of those frequencies found during the searching step, while camped on the uniquely identified cell, that are not of a higher priority public land mobile network, the history being associated with the uniquely identified cell;
periodically searching, at a slow rate so as not to consume much battery power, for higher priority public land mobile networks in all radio access technologies and frequencies supported by the radiotelephone; and
if a history already exists for the uniquely identified cell, then updating the history with any new frequencies found that are not of a higher priority public land mobile network to any previously found frequencies in the history.
3 Assignments
0 Petitions
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 registering and camping (300) the radiotelephone on a cell of visited PLMN. A next step includes uniquely identifying (302) the cell. A next step includes searching (304) for PLMNs with a higher priority than the visited PLMN while registered and camped on the uniquely identified cell. A next step includes storing (306) 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 registered and camped on that cell includes scanning (308) for available frequencies except for those frequencies listed in the history for the uniquely identified cell in which the radiotelephone is registered and camped.
51 Citations
17 Claims
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1. A method for a radiotelephone to search for higher priority public land mobile networks comprising:
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camping the radiotelephone on a cell of a visited public land mobile network and registering on the 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 while registered on the visited public land mobile network and camped on the uniquely identified cell; storing a history of those frequencies found during the searching step, while camped on the uniquely identified cell, that are not of a higher priority public land mobile network, the history being associated with the uniquely identified cell; periodically searching, at a slow rate so as not to consume much battery power, for higher priority public land mobile networks in all radio access technologies and frequencies supported by the radiotelephone; and if a history already exists for the uniquely identified cell, then updating the history with any new frequencies found that are not of a higher priority public land mobile network to any previously found frequencies in the history. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for a radiotelephone to search for higher priority public land mobile networks comprising:
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camping the radiotelephone on a cell of a visited public land mobile network and registering on the 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 while registered on the visited public land mobile network and camped on the uniquely identified cell; storing a history of those frequencies found while camped on the uniquely identified cell 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; periodically 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 while it is registered; periodically searching, at a slow rate so as not to consume much battery power, for higher priority public land mobile networks in all radio access technologies and frequencies supported by the radiotelephone; if a history already exists for the uniquely identified cell, then updating the history with any new frequencies found that are not of a higher priority public mobile network to any previously found frequencies in the history. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for a radiotelephone to search for higher priority public land mobile networks comprising:
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camping the radiotelephone on a cell of a visited public land mobile network and registering on the 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 while registered on the visited public land mobile network and camped on the uniquely identified cell; storing an individual history of those frequencies found during the searching step while camped on the uniquely identified cell 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; periodically 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 while it is registered; and periodically searching, at a slow rate so as not to consume much battery power, for higher priority public land mobile networks in all radio access technologies and frequencies supported by the radiotelephone; if a history already exists for the uniquely identified cell, then adding any newly found frequencies that are not of a higher priority public land mobile network to any previously found frequencies of the history to update the history previously found frequencies with any new frequencies found that are not of a higher priority public land mobile network. - View Dependent Claims (15, 16, 17)
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Specification