| 摘要 |
PROBLEM TO BE SOLVED: To provide a cellular system with an improved availability of frequencies. SOLUTION: A base station 1 is provided with 6 directivity antennas each converting 60 degrees to cover the range of 360 degrees, and a slave station 2 is provided with a slave station antenna 20 with a sharp angle of, e.g. 10 degrees. A hexagonal service area A0 has areas S1-S6 interfered with each base station 1 in 6 adjacent service areas A1-A6 and the base station 1 in the service area A0 registers in advance slave stations 2 belonging to the interference areas S1-S6. When the base station 1 receives a signal from one of the slave stations 2 registered in advance, the base station 1 makes a request to base stations interfering with the slave station 2 not to use antennas in the interfering directions or the interrupt communication when the antennas is already in use. |
