Method for the overlayed operation of two radio communication systems with reduced intersystem interference, and a radio communication system for overlayed use

摘要

In the overlayed operation of two cellular radio systems one of the two systems is a small-scale or indoor system and the other is a large- scale or outdoor system. The indoor system monitors the operation of the outdoor system and detects, which part of the available radio resources are temporarily not in use in the outdoor system. The indoor system dynamically selects an unused outdoor channel for indoor operation. The indoor radio traffic is divided into cyclically occurring time slots and some of the slots are used for monitoring the existing radio communication on other outdoor channels so that fast changes according to changing traffic and interference conditions are possible.