cellular mobile radio system having at least two base stations , and at least one mobile unit arranged to communicate with the base stations via a radio medium is provided . each base station includes apparatus for detecting the power of received signals , apparatus for generating a power control signalling bit for controlling the amplitude of a power signal , and apparatus for transmitting the power signal to the mobile unit . the mobile unit includes apparatus for receiving the power control bits , and apparatus means for monitoring the power control bits to identify the base station sending a greater number of control bits over a transmit frame , indicating that base station has received the higher average power signal over the transmit frame .