Patent ID: 6356540
Filing Date: 2002-03-12
Classification: H04L,H04W

Abstract:
A frequency carrier allocating method for a cellular system, said cellular system including plural base stations and plural mobile stations, said cellular system having two frequency bands each in which plural frequency carriers each divided into plural time slots are arranged and in which frequencies are not overlapped, each of said plural base stations allocating a downstream frequency carrier and a time slot in a down stream for transmission from a base station to a mobile station according to a communication request with said mobile station and allocating an upstream frequency carrier and a time slot in an up stream for transmission from said mobile station to said base station according to a communication request with said mobile station, so that said cellular system performs bi-directional communications between said base station and said mobile station, said method comprising the steps of:dividing said plural base stations into two groups including a first group (BSG1) and a second group (BSG2); allocating said upstream frequency carrier used in an up stream from a first frequency band (FB1) from one of said two frequency bands in one of said plural base stations belonging to said second group (BSG2), and allocating a downstream frequency carrier used in a down stream from a second frequency band (FB2) from one of said two frequency bands in said one base station belonging to said second group (BSG2); and allocating an upstream frequency carrier used in an up stream from the second frequency band (FB2) from one of said two frequency bands in another of said plural base stations belonging to said first group (BSG1), and allocating a downstream frequency carrier used in a down stream from the first frequency band (FB1) from one of said two frequency bands in said another base station belonging to said first group (BSG1).