Method and apparatus for handoff within a communication system

Details Method and apparatus for handoff within a communication system Method and apparatus for handoff within a communication system

H - Electricity

04

K

H04K 1/00 (2006.01) H04K 1/10 (2006.01) H04Q 7/32 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2308754

In a communication system (100) where a remote unit is given a time offset for a base station (102) and hands off to the base station (102) if the remote unit (113) can acquire the base station within a time window surrounding the time offset, a remote unit {113) utilizes the time offset of each base station (supplied by a serving base station (101) via downlink communication signal (116}) and searches for neighboring base stations within the time window surrounding its PN offset. The time window surrounding an individual base station's PN offset is allowed to vary depending upon whether the communication system (100) is time synchronized. In particular, a base station (101) supplies the remote unit {113) with an indication that the communication system (100) is operating in a synchronized or an unsynchronized mode, and the remote unit (i 13) varies the time window (search window) accordingly.

Dans un système de télécommunications (100), dans lequel on donne à une unité distante un décalage de temps pour obtenir une station de base (102) et la possibilité de transferts sur la station de base (102) si l'unité distante (113) peut obtenir la station de base à l'intérieur d'un créneau de temps englobant le décalage de temps. Une unité distante (113) utilise le décalage de temps de chaque station de base (fourni par une station de base serveur (101) via un signal de communication empruntant une liaison descendante) et recherche les stations de base voisines pendant le créneau de temps englobant son décalage de PB. Le créneau de temps englobant le décalage de PB d'une station de base donnée peut varier selon que le système (100) de télécommunications est ou non synchronisé. C'est en particulier une station de base (101) qui fournit à l'unité distante (113) une indication selon laquelle le système (100) de télécommunications fonctionne en mode synchronisé ou non synchronisé, en fonction de quoi l'unité distante (113) modifie le créneau de temps (créneau de recherche).

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