Cell extender with timing alignment for tdma systems

H - Electricity – 04 – B

Patent

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Details

H04B 7/26 (2006.01) H04J 3/06 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2185002

A cell extender (100) for use in digital cellular telephone systems (102) comprises a control module (134), a scanning module (132), and several traffic modules (130's). The control module (134) bidirectionally repeats the donor cell site (110) control channels. Voice modules therein bidirectionally repeat selected donor traffic channels for mobiles (112). The voice module amplifies and translates the Reverse Digital Traffic Channel (RDTC) (164) (transmitted by the mobile (112)). The voice module reframes the Forward Digital Traffic Channel (166), and advances its timing such that RDTC signals transmitted by the mobile (112) and repeated by the cell extender (100) arrive at the donor (110) with the correct timing alignment. The timing advance compensates for RF path propagation delay between the donor (110) and the cell extender (100), and for any additional delay through the cell extender (100). If the voice module determines that the mobile (112) is leaving the cell extender coverage area, it sends a hand-off message returning the mobile (112) to the assigned donor traffic channel.

Un dispositif (100) d'extension de cellule destiné à être utilisé dans des systèmes (102) de téléphone cellulaire numérique comprend un module de commande (134), un module de balayage (132) et plusieurs modules de trafic (130). Le module de commande (134) reproduit de manière bidirectionnelle les canaux de commande du site de la cellule de base (110). Les modules vocaux incorporés reproduisent de manière bidirectionnelle les canaux sélectionnés de trafic de la cellule de base pour les unités mobiles (112). Le module vocal amplifie et traduit le canal de trafic numérique de retour (CTNR) (164) (envoyé par l'unité mobile (112)). Le module vocal reverrouille la trame du canal de trafic numérique d'aller (166) et avance sa synchronisation de sorte que les signaux CTNR envoyés par l'unité mobile (112) et répétés par le dispositif (100) d'extension de cellule arrivent à la cellule de base (110) avec l'alignement correct de la synchronisation. L'avance de la synchronisation compense le retard de la propagation du trajet radioélectrique entre la cellule de base (110) et le dispositif (100) d'extension de cellule, et tout autre retard supplémentaire intervenant dans ce dernier (100). Si le module vocal détermine que l'unité mobile (112) quitte la zone de couverture du dispositif d'extension de cellule, il transmet un message de transfert qui renvoie l'unité mobile (112) au canal de trafic attribué à la cellule de base.

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