Patent ID: 8045495

Claim:
A method for resource allocation for multicast data in a wireless access system, the method comprising: scheduling multicast packets; dividing a resource allocation message for the scheduled multicast packets into a second multicast resource allocation message including information of a user group using a multicast identification (ID) and a first multicast resource allocation message including information transmitted in common to users of the user group; and transmitting the corresponding message including changed information for a change of information, wherein the second multicast resource allocation message includes at least one of a Header field that indicates the type of the resource allocation message, a Multicast ID field that indicates an index representing a user group receiving the same multicast data, Media Access Control ID (MACID) field that indicates an ID managed by a base station for discrimination between users of the user group, a MACID flag field that represents an indicator for indicating the new allocation or the deallocation of a MACID allocated to a multicast ID, and a Cyclic Redundancy Check (CRC) field that is used to determine if there is a channel decoding error.