Communications system

摘要

A cellular communications system is provided in which a user device selects a cell with which to register based on whether or not a candidate cell can provide an emergency call service. This determination is preferably determined having reference to a radio access technology associated with the candidate cell and, where the cell is an E-UTRA cell, having reference to information provided in system information output by the cell.

主权项

1. A communications device comprising a processor with a cell selection module configured to:
identify an acceptable cell on which the communications device may camp; determine the Radio Access Technology, RAT, supported by the cell; when the determined RAT is a RAT that supports cells that can provide a circuit switched (CS) emergency call service, select the cell, as a cell on which to camp; and when the determined RAT is a RAT that supports cells that cannot provide a CS or packet switched (PS) emergency call service, reject the cell, as a cell on which to camp; and wherein when said cell selection module determines that the radio access technology is E-UTRA, the cell selection module obtains cell system information output by the cell and processes the cell system information to determine the cell can perform an emergency call service without redirection.