Patent ID: 8200241

Claim:
A terminal random access method for a cellular radio communications system, comprising the following steps: a terminal already knowing a usable random access time slot, and combining location information of the random access time slot in a radio frame and that in the frequency domain to generate an expected group identifier; the terminal sending a random access preamble message to a base station in the random access time slot in the radio frame; the base station combining location information of the random access time slot in the radio frame and that in the frequency domain to generate a group identifier, and after adding the group identifier and an individual identifier that corresponding to the random access preamble message to a random access response message, sending the random access response message to the terminal; and the terminal determining whether the random access response message that corresponding to the sent random access preamble is received, by determining whether the group identifier in the received random access response message is the expected group identifier, and whether the individual identifier in the received random access response message is an expected value of the individual identifier, wherein the expected value of the individual identifier is the identification number of the random access preamble sent by the terminal.