Method and system for calculating neighborhood 2g-3g for automatic handover between 2G and 3G systems.

摘要

A method of calculating the proximity or neighborhood 2G-3G in order to allow parameterization of an automatic handover between systems different generation when a mobile radio terminal dual mode or bimodal, moves between such systems, which is practiced in a cellular radiotelephone network by computer equipment (1), and comprising a prior modeling step (50) comprising fractionating the network (4) in a plurality of radio cells generated by means transmission / reception (41) of base stations (40) of the network (1), so that fractionation distinguishes the frequency bands used in each of the cells, the computer equipment (1) memorizes in storage means (10) coverage data in every point of the network, characterized by comprising a step (51) called hierarchical structure or hierarchy, using the coverage data to produce, in hierarchy tables (T), for each frequency band within the fragmented network (4), data best server cell (C1) and at least best second server cell (C2) respectively representative of an index which provides a repertoire of zones (a) of radio cells corresponding to the best coverage level or, respectively, the second best coverage level, such that the method further comprises: - one step configuration (52) comprising storing a configuration file (104) of calculation parameters, - a step (53) for determining the area (a) of radio cells and the frequency band "source "used in a first system by the mobile radio terminal double mode, followed by a selection step (54) in the hierarchy tables, of at least one cell corresponding starting to this area (a) and the frequency band determined "source" - a a generation step (55), from the hierarchy tables, a list of cells known as candidates belonging to a second system and neighboring said starting cell (21, 22), - a selection step (56) in the candidate list, at least one arrival cell according to at least one selection criterion.