Avoidance of service interruptions in visited public land mobile network (VPLMNs)
First Claim
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1. A method in a user equipment of selecting among available public land mobile networks (PLMNs), each PLMN including at least one cell, comprising the steps of:
- scanning for available PLMNs;
picking an available PLMN;
reading system information of at least one cell in the picked available PLMN;
evaluating a cell selection criterion based on the read system information;
repeating the picking, reading, and evaluating steps for remaining available PLMNs; and
selecting an available PLMN having a highest priority and having a cell fulfilling the cell selection criterion.
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Abstract
By evaluating a cell selection criterion S during scans for available public land mobile networks (PLMNs), a user equipment (UE) can avoid network service interruptions by not selecting PLMNs for which there exist no suitable cells. The cell selection criterion can be evaluated based on cell parameters either read during the PLMN selection procedure or locally stored before the PLMN selection procedure. It is possible to reduce the time required for PLMN scans and UE power consumption.
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Citations
21 Claims
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1. A method in a user equipment of selecting among available public land mobile networks (PLMNs), each PLMN including at least one cell, comprising the steps of:
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scanning for available PLMNs;
picking an available PLMN;
reading system information of at least one cell in the picked available PLMN;
evaluating a cell selection criterion based on the read system information;
repeating the picking, reading, and evaluating steps for remaining available PLMNs; and
selecting an available PLMN having a highest priority and having a cell fulfilling the cell selection criterion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus in a user equipment for selecting among available public land mobile networks (PLMNs), each PLMN including at least one cell, comprising a processor configured to scan for available PLMNs;
- to pick an available PLMN;
to read system information of at least one cell in the picked available PLMN;
to evaluate a cell selection criterion based on the read system information;
to repeat the picking, reading, and evaluating for remaining available PLMNs; and
to select an available PLMN having a highest priority and having a cell fulfilling the cell selection criterion. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- to pick an available PLMN;
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15. A computer-readable medium containing a computer program for causing a receiver to select among available public land mobile networks (PLMNs), each PLMN including at least one cell, the computer program implementing the steps of:
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scanning for available PLMNs;
picking an available PLMN;
reading system information of at least one cell in the picked available PLMN;
evaluating a cell selection criterion based on the read system information;
repeating the picking, reading, and evaluating steps for remaining available PLMNs; and
selecting an available PLMN having a highest priority and having a cell fulfilling the cell selection criterion. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification