Patent ID: 6359867
Filing Date: 2002-03-19
Classification: H04W

Abstract:
A method of allocating a channel in a mobile telephone system, in a radio interface of which transmission and reception take place at different carrier wave frequencies and a transmission frame and a reception frame comprise several time slots, whereby a time slot and frequency form a channel, on which a traffic signal is transmitted as bursts, comprising:forming at least one message containing information about a base station, transmitting formed messages continuously from the base station via a pilot signal, wherein the frequency of the pilot signal is a same frequency as a carrier wave frequency but the signal level of the pilot signal is lower than the signal level of the traffic signal, the band width of the pilot signal is the same as that of the traffic signal, and wherein each individual message is located in the pilot signal within a period which corresponds to a transmission time slot in terms of time, so that when the message is located in time slots where no traffic signal is transmitted, the signal level of the pilot signal is at a first amplitude lower than the traffic signal and above an input resolution for detection of the pilot signal, and when the message is located in time slots where a traffic signal is being transmitted, the signal level of the pilot signal is but above the first amplitude of the pilot signal where no traffic signal is transmitted lower than the traffic signal level, and after a mobile has received the pilot signal, handover is performed when required to a free channel indicated in the message.