Subscriber authentication for radio local loop system

H - Electricity – 04 – M

Patent

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H04M 1/66 (2006.01) H04Q 7/38 (2006.01) H04Q 7/20 (2006.01)

Patent

CA 2198800

The network security of a radio local loop system is highly desirable to avoid fraudulent use of the network by unauthorised users with appropriate subscriber equipment. For fixed subscribers, the propagation delay between base station (1) and subscriber unit (3) will also remain fixed and, provided this is measured with sufficient accuracy, the distance from the subscriber to the base station can bedetermined. This can be used as an aid to the authentication of a subscriber. Other signal characteristics which are indicative of the physical location of a purported subscriber can be used, such as directional information. In a system in which propagation delay has to be monitored anyway, for other purposes, such as orthogonal CDMA code synchronisation, or for a TDM system, added security can be obtained without great extra cost.

Il est très souhaitable d'assurer la sécurité d'un système radio local afin d'en éviter l'utilisation frauduleuse par des utilisateurs non autorisés au moyen de l'équipement d'abonné voulu. Pour des abonnés fixes, le temps de propagation entre la station de base (1) et l'unité d'abonné (3) demeure également fixe de sorte que, pourvu que ce temps soit mesuré avec assez de précision, on peut déterminer la distance séparant l'abonné de la station de base. Cela peut faciliter l'authentification d'un abonné. D'autres caractéristiques des signaux qui indiquent l'emplacement réel d'un abonné supposé peuvent être utiles, par exemple l'information directionnelle. Dans un système où le temps de propagation doit être contrôlé de toute façon à d'autres fins, par exemple pour la synchronisation des codes AMRC orthogonaux, ou dans le cas d'un système TDM, la sécurité peut être améliorée sans grands frais supplémentaires.

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