Method for preventing a dropped call during a handoff in a...

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/38 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2158114

A method, performed by a mobile station (119), prevents an active call from being dropped when the mobile station (119) suddenly transitions from a first coverage area (121) to a second coverage area (122) in a code division multiple access (CDMA) cellular radiotelephone system (100). The active call is determined (601) to be in danger of being dropped responsive to the mobile station (119) suddenly transitioning from the first coverage area (121) to the second coverage area (122). The first base station (115) is notified (602) that the active call is in danger of being dropped responsive to the step of determining (601). The active call with the first base station (115) is determined (603) to be in the process of being dropped responsive to the step of notifying (602). The active call is established (604) with the second base station (116) in the second coverage area (122) before the active call with the first base station (115) is dropped responsive to the step of determining (603).

Procédure suivie par une station mobile (119) d'un système radiotéléphonique à cellules à accès multiple par code de répartition (AMCR), en vue d'empêcher un appel actif d'être coupé lorsque la station mobile (119) passe rapidement d'une première zone de couverture (121) à une seconde zone de couverture (122). Le système détermine (601) qu'un appel actif risque d'être coupé lorsqu'une station mobile (119) passe soudainement de la première (121) à la deuxième (122) zone de couverture. € la suite de cette étape de détermination (601), un avertissement (602) est envoyé à la première station de base (115). L'appel actif de la première station de base (115) est considéré (603) comme étant en train d'être coupé une fois que l'avertissement a été lancé (602). L'appel actif est pris en charge (604) par la deuxième station de base (116) située dans la seconde zone de couverture (122) avant que l'appel actif établi avec la première station de base (115) ne soit coupé, une fois que le système l'a considéré (603) comme en passe d'être coupé.

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