Apparatus and method for allocating a harq channel identifier in a wireless access system

Herein is control information in a wireless access system, a method for allocating HARQ channel identifier (ACID), via a base station and a dynamic service process, indicating the initial ACID (initial HARQ channel identifier) ​​value that is mapped to a particular service flow a first message includes receiving from the base station; Receiving a second message indicating the fixed resource allocation from the base station, the second message comprises an initial value and ACID ACID number information used in fixed resource allocation, and; Comparing the control information with the initial ACID values ​​included in the second message included in the first message; And including the step of allocating, if the initial ACID value contained in the control information and the second message included in the comparison, the first message are the same, the ACID value used for the fixed resources assigned to said particular service flow achieved.