A FREQUENCY HOPPING CONTROL CHANNEL IN A RADIO COMMUNICATION SYSTEM

摘要

The invention relates to a method for positioning mandatory time division multiple access (TDMA) frames which are mandatory to be transmitted during discontinuous transmissions (DTX) of TDMA frames in traffic channels (TCH) by a fixed sub-system of a radio communications system. It is assumed that said TDMA frames are transmitted using cyclic frequency hopping with two different frequencies. In order to improve air interface measurement methods in a radio access system, it is proposed that said mandatory TDMA frames are positioned for each sub-channel that can be employed as TCH in a way that said mandatory TDMA frames are always transmitted using both of said two different frequencies in the respective sub-channel within a predetermined number of TDMA frames. The invention equally relates to a corresponding radio communications network, a corresponding base station and mobile terminal and a corresponding subset of mandatory TDMA frames.