Method and apparatus for hard handoff in a cdma system

Details Method and apparatus for hard handoff in a cdma system Method and apparatus for hard handoff in a cdma system

H - Electricity

04

Q

H04Q 7/38 (2006.01)

Patent

CA 2256425

In a communications network, a network user communicates through a remote unit (30) with another user via at least one base station (100). The communications network includes a first mobile switching center (MSC-I) which controls communications through a first set of base stations including a first base station (100). The remote unit (30) stores a list of active base stations which has an entry corresponding to each base station with which active communication is established. The first base station (100) has an entry on the list of active base stations. The first base station (100) measures a round trip delay of an active communication signal between the first base station (100) and the remote unit (30). A handoff of the active communication signal is initiated if the round trip delay of the active communication exceeds a threshold if the first base station (100) is designated as a reference base station. Alternatively, the remote unit (30) also stores a list of candidate base stations comprising an entry corresponding to each base station through which active communication may be possible but is not established. A handoff of the active communication signal is initiated if the list of candidate base stations comprises an entry corresponding to a triggering pilot signal.

Dans un réseau de télécommunications, un abonné communique au moyen d'une unité éloignée (30) avec un autre abonné par l'intermédiaire d'au moins une station de base (100). Ledit réseau comporte un premier centre de commutation (MSC-1) qui régit les communications via un premier groupe de stations de base comprenant une première station de base (100). L'unité éloignée (30) détient une liste de stations de base active présentant une entrée pour chacune des stations de base avec laquelle une communication active est établie. La première station de base (100) possède une entrée sur la liste des stations de base actives. La première station de base (100) mesure le temps de propagation AR d'un signal de communication active entre la première station de base (100) et l'unité éloignée (30). Un transfert du signal de communication active a lieu si le temps de propagation AR dépasse un certain seuil alors que la première station de base (100) est désignée comme étant la station de base de référence. Dans une variante, l'unité éloignée (30) peut également détenir une liste de stations de base candidates comportant une entrée pour chacune des stations de base par l'intermédiaire desquelles une communication active est possible, mais non établie. Le transfert du signal de communication active a lieu si la liste des stations de base candidates comporte une entrée correspondant à un signal pilote de déclenchement.

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