Patent ID: 6031863
Filing Date: 2000-02-29
Classification: H04B,H04W

Abstract:
A wireless LAN system having a plurality of cells each comprising a base-station device and one or more radio terminals serving under the base-station device and wherein said base-station device and said one or more radio terminals in each of said plurality of cells perform mutual communications using a low-speed frequency hopping/spread spectrum system while frequencies are hopped at regular intervals by said cells and individual base-station devices in said cells are mutually connected to one another, each base-station device comprising:means for assigning inherent hopping patterns at each cell;means for generating a cue for providing synchronization between base-stations devices from a hopping timing;synchronism control means for enabling communications between the respective base-station devices in the cells in accordance with the cue, generated by said means for generating the cue, thereby providing hopping synchronization between the base-station devices:wherein each base-station device further comprises means for communicating with other base-station devices to divide said respective base-station devices in said plurality of cells into a single master base-station device and base-station devices other than said master base-station into slave base-station devices;wherein with respect to said master base-station device, said synchronism control means of said master base-station device provides the hopping synchronization between said master base-station device and said one or more radio terminals serving under said master base-station device in accordance with the cue generated by said means for generating the cue and notifies a hopping synchronous request to said each slave base-station device; andwherein with respect to said slave base-station device, said synchronism control means provides the hopping synchronization between said slave base-station device and said one or more radio terminals serving under said slave base-station device in response to the hopping synchronous request notified from said master base-station device.