Communication transfer in a cellular radiotelephone system

Details Communication transfer in a cellular radiotelephone system Communication transfer in a cellular radiotelephone system

H - Electricity

04

B

H04B 7/26 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2070916

During the handoff of a mobile unit (225) between a serving or source base-site (200) and a selected target base-site, (205 or 210) the target base-site (205 or 210) is directed to tune to and monitor the mobile unit's in progress call on a serving base-site channel frequency in order to verify target cell selection immediately before the handoff. Thereafter, the mobile unit (225) is directed to tune to a selected target base-site channel by the target base-site. Next, the target base-site (205 or 210) re-tunes itself to the selected target channel frequency and continues to transmit. Upon the arrival of the mobile unit onto the selected target channel, the serving base-site channel is released.

Durant le transfert d'une unité mobile (225) entre un site de base serveur ou source (200) et un site de base cible (205 ou 210) sélectionné, ce site de base cible (205 ou 210) est contraint à se syntoniser sur l'appel en cours de l'unité mobile et à surveiller cet appel sur une fréquence de site de base serveur pour vérifier la sélection de la cellule cible immédiatement avant le transfert. Par la suite, l'unité mobile (225) est contrainte par le site de base cible sélectionné à se syntoniser sur l'un des canaux de ce dernier. Le site de base cible (205 ou 210) se resyntonise ensuite sur la fréquence du canal cible sélectionnée et poursuit l'émission. Quand l'unité mobile arrive sur le canal cible sélectionné, le canal du site de base serveur est libéré.

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