A METHOD FOR IMPROVING THE RELIABILITY OF A HANDOVER AND CALL ESTABLISHMENT, AND A CELLULAR RADIO SYSTEM

摘要

The present invention relates to a method for improving the reliability of a handover and call establishment in a cellular radio system which comprises at least one base station (100) in each cell, and a group of subscriber terminal equipments (108-112) which communicate with one or more base stations, which base stations measure the total interference level of signals they have received from the terminal equipments, and transmit a pilot signal with a known transmit power, and which terminal equipments measure the power levels of pilot signals received from different base stations, and in which system at least some transceivers (100, 108-112) comprise means (220, 226) for estimating, by means of the pilot signals, the path loss between the terminal equipment and the base stations. To improve the reliability of the handover and call establishment, at least some transceivers (100, 108-112) in the system of the invention estimate the signal to noise ratio between the terminal equipment and the base station in the uplink transmission direction on the basis of the total interference measured at the base station, the path loss and the terminal equipment transmit power.