Patent ID: 8326301

Claim:
A method of supporting mobility between an evolved Universal Mobile Telecommunication System (UMTS) terrestrial radio access network (E-UTRAN) and a cell of a different radio access technology (RAT), the method comprising: receiving cell reselection information and neighbor cell information from a base station (BS) of a present cell, wherein the cell reselection information includes thresholds for determining whether or not a quality of the cell of the different RAT shall be measured, wherein the neighbor cell information includes a frame duration code and a frame number of a downlink frame in the cell of the different RAT, wherein the frame duration code indicates a start preamble of the downlink frame; determining whether or not a mobile station (MS) shall measure the quality of the cell of the different RAT using the thresholds; and measuring the quality of the cell of the different RAT and reselecting a cell or transmitting a measured result to the BS through a measurement report message according to the measured result, if it is determined that the MS shall measure the quality of the cell of the different RAT, wherein transmitting the measured result through the measurement report message comprises adjusting, by the MS, a transmission frequency of the measurement report message using at least a hysteresis parameter or a time-to-trigger parameter, wherein the hysteresis parameter is used when the hysteresis parameter is higher than the thresholds, and wherein the time-to-trigger parameter is used when the quality of the cell of the different RAT is higher than the thresholds and a quality of the present cell is equal to or lower than the thresholds.