Patent ID: 6122515
Filing Date: 2000-09-19
Classification: H04W

Abstract:
A fixed unit situated in a physical area of a cellular communication system wherein the physical area is divided into a plurality of cells, each cell comprising a base unit and being assigned one of a plurality of communication channel groups employed in said cellular communication system, such that at least those of the communication channel groups which are assigned to adjacent ones of the cells are different from each other, and radio communication is performed between the base units of the cells and a mobile unit moving in the physical area by using communication channels of the communication channel groups, said fixed unit comprising:a wired communication circuit configured for signal transmission/reception with a communication network via a wired line;a control circuit for sequentially receiving signals transmitted via communication channels included in communication channel groups assigned to cells of the cellular communication system, identifying, on the basis of the reception results, the one of the communication channel groups which is assigned to the one of the cells in which a fixed unit is situated, selecting, on the basis of the identification results, those of the communication channel groups which are not assigned to the one cell in which the fixed unit is situated, and storing the selected communication channel groups;a radio communication circuit configured to select a communication channel to be used, on the basis of the communication channel groups stored in said control circuit, and to perform signal transmission/reception with the mobile unit via the selected communication channel; anda communication control circuit configured to connect the wired communication circuit and the radio communication circuit in the case of performing communication between the communication network and the mobile unit.