RADIO TELECOMMUNICATION SYSTEM, BASE STATION AND MOBILE SUBSCRIBER TERMINAL WHICH EXCHANGE RADIO SIGNALS IN ACCORDANCE WITH A FREQUENCY HOPPING SEQUENCE

摘要

Radio telecommunication systems are known which comprise at least one base station as well as mobile subscriber terminals and with which radio signals are transmitted and received in different time and frequency slots. The radio signals are transmitted in accordance with a predetermined frequency hopping sequence on both the user and signaling channels. According to the invention the base station and the subscriber terminals have control means (CTR) for controlling the change in the frequency slot which do not generate a frequency hopping series for the first part of the time-slot pattern but provide a fixed frequency (f0) and which for at least one other part of the time-slot pattern generate a pseudo-random frequency hopping sequence (THS) using an iterative method (LGNR). The base station sends an input value (CW) to the subscriber terminals for calculation of the pseudo-random frequency hopping sequence. The control means for registering the subscriber terminals control the frequency change in accordance with this pseudo-random frequency hopping sequence. This means that already for the transmission of registration signals a calculated frequency hopping sequence is used, i.e. a frequency hopping sequence which is developed on the basis of the input value and does not have to memorized in full.