Patent ID: 7733897

Claim:
A channel allocating method for random access, comprising: setting up a first type channel area (I c ) dedicated for a new access attempt among random access channels of a prescribed frame (t); allowing a specific mobile terminal to attempt a new access to an access point via a prescribed random access channel within the first type channel area (I c ), wherein the first type channel area (I c ) is not used for an access re-attempt; and allowing the specific mobile terminal to re-attempt the access to the access point via a second type channel area (R c ′) set up to be used for the access re-attempt at a frame (t+1) next to the frame (t) except a first type channel area (I c ′) dedicated for a new access attempt among the random access channels at the frame (t+1) if the specific mobile terminal fails in the access attempt at frame (t), wherein a random access channel of a frame (t+1+δ) delayed by a prescribed time δ is allocated to the specific mobile terminal which fails in the access attempt at the frame (t) if the second type channel area (R c ′) at frame (t+1) cannot be allocated to the specific mobile terminal for the access re-attempt, and wherein the random access channel of the frame (t+1+δ) corresponds to a first type channel area (I c ″) to be dedicated for the new access attempt among random access channels at the frame (t+1+δ).