Patent ID: 7554955

Claim:
A method for detecting random access of user equipment (UE), applicable to a mobile communication system consisting of at least one base station (BS) and a group of UEs, wherein said BS and said group of UEs use a set of N (N is a positive integer) orthogonal or quasi-orthogonal pseudo-random sequence codes for the random access of UE, and by detecting the pseudo-random sequence code selected by each randomly accessed UE, BS implements a simultaneous detection of the random access of UEs, the method comprising: A. BS making a correlation operation of the random access signal received at one moment from UE containing information of the pseudo-random sequence codes selected by the accessing UE with a pseudo-random sequence code from the local pseudo-random sequence code set of the BS, and obtaining a corresponding correlation result window, wherein said correlation operation starts from any pseudo-random sequence code of the pseudo-random sequence code set and ends when operations with all the N pseudo-random sequence codes are completed; B. finding the maximum correlation peak value point in every correlation result window; C. based on the position of each correlation peak value point, finding a correlation peak window in the corresponding correlation result window, or finding a correlation peak window and the front-side and rear-side windows at both sides of the correlation peak window in the correlation result window; D. selecting one or more thresholds, comparing the correlation results in every correlation peak window or every correlation peak window and its front-side and rear-side windows with said one or more thresholds in one or more conditions respectively, if all the conditions are satisfied, determining that the pseudo-random sequence code taking part in the correlation operation in Step A is the pseudo-random sequence code selected by a UE accessing at that moment.