Continuous interference assessment and avoidance in a land...

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/36 (2006.01) H04Q 7/30 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2217812

In a land mobile radio system including at least one base site having a system for interconnecting a plurality of radio channel units with a plurality of directional antennas and/or antenna beams, the base site further includes interference avoidance means for controlling communications between each radio channel unit of the base site and mobile radio units communicating with the base site so as to avoid causing potential interference at the operating frequency of each radio channel unit at other base sites. The interference avoidance means includes means for monitoring potential interference at the operating frequency of each radio channel unit on each antenna beam. If potential interference exists on an antenna beam determined to be the antenna beam best suited for transmitting and receiving signals at the operating frequency of the radio channel unit, a determination is made if adjacent antenna beams have reduced chance of potential interference and sufficient signal strength for communication and therefore are better suited for transmitting signals at the operating frequency of the radio channel unit. To further enhance interference avoidance, a comparison is made of the signal strength of received signals at the operating frequency of the radio channel unit with one or more threshold values to assess the proximity of the mobile radio unit to the base site, and the transmission signal strength for signals transmitted from the radio channel unit to the mobile radio unit are controlled based on the proximity assessment.

L'invention est un système radio mobile terrestre comportant au moins un site de base doté d'un dispositif servant à interconnecter une pluralité d'unités radio fixes avec une pluralité d'antennes directives. Ce site de base est de plus doté d'un dispositif antibrouillage servant à contrôler les communications entre chacune de ses unités radio fixes et les unités radio mobiles en communication avec lui afin d'éviter le brouillage à la fréquence de travail de chaque unité radio fixe des autres sites de base. Ce dispositif antibrouillage comporte une unité de surveillance du brouillage possible à la fréquence de travail de chaque unité radio fixe sur chaque faisceau d'antenne. S'il existe une possibilité de brouillage sur le faisceau d'antenne le plus approprié à l'émission et à la réception de signaux à la fréquence de travail de l'unité radio fixe, le dispositif antibrouillage détermine si la possibilité de brouillage est moindre sur les faisceaux d'antenne adjacents et si l'intensité des signaux y est suffisante pour les communications et, par conséquent, si ces faisceaux sont plus appropriés à la transmission des signaux à la fréquence de travail de l'unité radio fixe. Pour améliorer les mesures antibrouillage, l'intensité des signaux reçus à la fréquence de travail de l'unité radio fixe est comparée avec une ou plusieurs valeurs de seuil afin d'évaluer la proximité de l'unité radio mobile par rapport au site de base et l'intensité des signaux transmis de l'unité radio fixe à l'unité radio mobile est contrôlée à l'aide de l'évaluation de proximité.

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