Patent ID: 6208855
Filing Date: 2001-03-27
Classification: H04B,H04W

Abstract:
A method for transmitting data from a base station to a mobile station in a mobile communication system, comprising the steps of:a) preparing a plurality of predetermined frequencies;b) monitoring a received signal strength in at least one side of the base station and the mobile station;c) concurrently transmitting a plurality of radio signals from the base station to the mobile station when the received signal strength reduces to less than a predetermined level, wherein each of the radio signals has a different one of the predetermined frequencies and conveys the same data;d) a transceiver at the mobile station transmits a mobile-to-base radio signal of frequency f.sub.up to the base station and receives a base-to-mobile radio signal of frequency f.sub.D1 from the base station, a receiver at the mobile station receives a base-to-mobile radio signal of frequency f.sub.D2 from the base station and does not transmit a mobile-to-base radio signal, andi. in a normal receive communication mode, power is supplied to the transceiver to perform normal communications with the base station, and power is not supplied to the receiver, andii. when radio communications through the transceiver are impaired, the mobile terminal changes from the normal receive mode to a receive-only mode in which power is supplied to both the receiver and the transceiver to receive the same data from the base station through two different frequency channels, such that base-to-mobile signals of frequencies f.sub.D1 and f.sub.D2 are concurrently received by the transceiver and the receiver.