System and method for transmitting/receiving resource allocation information in a communication system

The present invention in a communication system, the first information and the length information of the first information which the base station includes the downlink resource allocation information necessary for supporting the first mode to a first mode supported by the base station It transmits the second information including. In addition, the terminal if after the notification receiving the first information and the second information from the base station to notify the second mode in which the own terminal supported by the base station, and, when the first mode and the second mode different from , and skips without decoding as much downlink resource allocation information of a length corresponding to the length information. HARQ DL MAP IE, Length, Duration, N.ACK channel, the sub-burst IE