Patent ID: 8559959

Claim:
A handoff access method based on random access channel, for handoff access of a mobile terminal of a cellular mobile communication system, comprising the steps of: Step a, sending a handoff request message to a target base station (BS) by a source BS, the handoff request message is used to request switching a mobile terminal that the source BS serves to the target BS; Step b, sending a handoff response message to the source BS by the target BS, then forwarding a handoff command with the content of the handoff response message to the mobile terminal by the source BS, wherein a sequence number of a reserved character code allocated by the target BS to the mobile terminal and a random access sub-channel that the reserved character code is located in are contained in the handoff command message, and the reserved character code is a part of random access character codes reserved for the handoff access mobile terminal in advance; Step c, after receiving the handoff command message by the mobile terminal, determining the handoff command message includes the sequence number of the reserved character code and then selecting the reserved character code and the random access sub-channel that the reserved character code is located in, by the mobile terminal; and Step d, initiating a handoff access procedure on the random access sub-channel by the target BS and the mobile terminal.