Handover management in group calls

Details Handover management in group calls Handover management in group calls

H - Electricity

04

W

H04W 36/08 (2009.01) H04W 4/06 (2009.01)

Patent

CA 2626433

A method of indicating, by a mobile terminal of a digital cellular radiocommunication system that is in the receiving phase in a group call while roaming in a current cell, to a fixed network element of the system, a given destination cell out of a number N of cells adjacent to the current cell, wherein: - the system uses a time and/or frequency division multiple access method, and any modulation method; - the mobile terminal sends an identification sequence of the destination cell in a time slot of an inbound signalling channel which is a contention channel; - the identification sequence comprises a predetermined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer number such that 1<P<= N; and, - the values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals.

L'invention concerne un procédé d'indication, par un terminal mobile d'un système de radiocommunication cellulaire numérique en phase de réception d'un appel de groupe en itinérance dans une cellule courante, à un élément de réseau fixe du système, d'une cellule destinataire donnée parmi un nombre N de cellules adjacentes à la cellule courante, dans lequel: - le système utilise un procédé d'accès multiple par répartition de fréquence et répartition dans le temps, et tout autre procédé de modulation; - le terminal mobile envoie une séquence d'identification de la cellule destinataire dans un intervalle temporel d'un canal de signalisation entrant constituant un canal de contention; - la séquence d'identification comprend un motif d'identification parmi un nombre P déterminé de motifs d'identification de différentes valeurs respectives, P étant un entier tel que 1<P= N; et - les valeurs des motifs d'identification P correspondent à des signaux modulés orthogonaux.

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