the present invention discloses constructs and methods for transmitting a harq re - transmission in an adaptive manner in a wireless communication system . the system of the present invention discloses : scheduling the re - transmission of a data packet , based on decoding results from a receiver ; determining a plurality of parameters for re - transmission in an adaptive manner ; sending an assignment message if required ; using a plurality of fields in the assignment message for re - transmission to indicate the plurality of parameters in the re - transmission ; using a macid field in the assignment message for re - transmission to indicate a target mobile station for the re - transmission ; transmitting a data packet for the re - transmission ; and decoding the data packet at the receiver to determine if a further need of re - transmission exists .