| 摘要 |
PROBLEM TO BE SOLVED: To significantly reduce the radio wave interference when the same hopping pattern is selected and used between the radio base stations by setting plural different radio frequencies to form a hopping pattern and also setting a constant hopping sequence at least at one of plural base stations and performing the communication between the base stations by means of the switching time of each set and changed radio frequency. SOLUTION: A pattern selection means 15P selects one of hopping patterns which are previously decided at every radio base station 20. At the same time, plural radio frequencies forming a hopping pattern are set at the station 20 together with a constant hopping sequence. Then a switching time setting/ changing means 15t selects and changes the switching time (ti) of each radio frequency, and the radio communication means 11 and 12 communicate with every radio slave station by defining every radio frequency switching time as the set/changed switching time. Thus, the probability of occurrence of the radio wave interference can be significantly reduced between the radio base stations which selected the same hopping pattern. |
