Importance

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Abstract

A dynamic frequency allocation method of a digital, mobile, portable telephone system wherein in communications between a plurality of base stations which are connected to a public telephone network and/or a private branch exchange and which respectively generate synchronization in an independent manner and mobile stations receiving service therefrom, each base station uses a communication signal transmission channel including a frequency and a time slot pair respectively selected from a plurality of frequencies and a plurality of time slots related thereto to implement a multichannel time division multiplex/time division duplex communication. Each of the base and mobile stations receives a communication signal of a different station communicating with synchronization independent of the pertinent station by use of a different time slot at the same frequency of the channel used by the station to receive a communication sent thereto so as to measure an interval or a distance between the time slot used by the different station and the time slot assigned thereto. Based on the measurement result, a chance of a collision between these two time slots is estimated such that depending on the estimation result, the pertinent station detects free channels not being used by any other stations to conduct a channel transition to one of the detected free channels.

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First Claim