Method for detecting random access of user equipment

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, dividing a correlation peak window from the corresponding correlation result window, or dividing a correlation peak window and the front-side and rear-side windows at both sides of the correlation peak window from the correlation result window;
• D. selecting one or more thresholds, considering the correlation results in every correlation peak window or every correlation peak window and its front-side and rear-side windows larger than said one or more thresholds as conditions, and performing one or more comparisons related to the corresponding conditions, 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.