Method for synchronizing a terminal with a frequency of a radio-communications network, corresponding computer software product, storage means and terminal

摘要

A method and apparatus are provided for synchronizing a terminal with a frequency from an ordered initial sequence of frequencies of a radio-communications network. An available power spectrum associates to each frequency of the initial sequence a power value representing the power with which the frequency is received by the terminal. At least one first range of consecutive frequencies is determined within the initial sequence, having a power variation below a first predetermined threshold. The terminal attempts at least one first synchronization with a frequency of the first range. If each first synchronization fails, the terminal obtains a modified sequence by modifying the position of the frequency or frequencies of the at least one first range of the initial sequence or by eliminating the at least one first range. The terminal then attempts a second synchronization with at least one of the frequencies of the modified sequence.

主权项

1. A method for synchronizing a terminal with a frequency from among an ordered initial sequence of frequencies indexed within a frequency table of a radio-communications network, the terminal having available a power spectrum associating to each frequency of the initial sequence a power value representing the power with which the frequency is received by the terminal, wherein the method comprises:
detecting at least one part of the power spectrum that presents a power variation below a first predetermined threshold; determining, within the initial sequence, at least one first range of consecutive indexes of consecutive frequencies of the frequency table, which is associated with said at least one part of the power spectrum; attempting at least one first synchronization of the terminal with a frequency of said at least one first range; in the event of failure of each of said at least one first synchronization, obtaining a modified sequence by modifying the consecutive indexes of the consecutive frequencies of said at least one first range within the initial sequence; and attempting a second synchronization of the terminal with at least one of the frequencies of the modified sequence.