A method and apparatus for testing a base station in a time...

Details A method and apparatus for testing a base station in a time... A method and apparatus for testing a base station in a time...

H - Electricity

04

Q

H04Q 7/34 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2154281

In a base station of a mobile cellular telephone system of the type having time division multiple access (TDMA) channels, a radio frequency test loop is established between a predetermined downlink channel of a base station transmitter and a predetermined uplink channel of a base station receiver. The test loop is in real time, thereby eliminating the time offset of the radio channels used for communications. The radio frequency test loop includes a circuit for transposing the frequency of the carrier signal from the transmitter to a frequency that can be received by the receiver. The signal having the transposed frequency is used in tests for determining values such as bit error rate (BER), transmission signal level, or reception sensitivity.

Dans une station de base d'un système de téléphonie cellulaire mobile de type AMRT (accès multiples à répartition dans le temps), on établit une boucle d'essais en radio-fréquences entre un canal descendant prédéterminé d'un émetteur de station de base et un canal montant prédéterminé d'un récepteur de station de base. Cette boucle d'essais fonctionne en temps réel, ce qui élimine le décalage temporel des canaux radio utilisés pour ces communications. La boucle d'essais en radio-fréquences comporte un circuit qui transpose la fréquence du signal de la porteuse provenant de l'émetteur en une fréquence pouvant être reçue par le récepteur. Le signal à fréquence transposée sert lors d'essais permettant de déterminer les valeurs telles que le taux d'erreur binaire, le niveau de signal d'émission ou la sensibilité de réception.

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