| 摘要 |
PURPOSE:To prevent communication efficiency from degrading even when a cell is overlapped by hopping the carrier wave frequency of a radio frame inside the present cell at each base station at prescribed timing based on control information. CONSTITUTION:Five base stations #1-#5 are mutually connected by the backbone, the base station $5 becomes a main base station and transmits an inter-base station control frame to the backbone, and the other four base stations #1-#4 to be the slave base stations received with the control frame hop the carrier frequency synchronously with the main base station. In this case, the base station #5 uses a sub-channel 9 and the other base stations #4-#1 respectively use sub-channels 7, 5, 3 and 1. Each base station switches the sub-channel to be used at prescribed hop timing while selecting the next sub-channel in a clock- wise direction for each frame. The switching of the sub-channel can be simultaneously performed by the plural base stations synchronously with a command from the main base station. |
