A practical HARQ scheme with network coding for LTE-A broadcasting system

In order to improve broadcasting efficiency in LTE-A system, a novel HARQ scheme with network coding (NC) technology is presented in this paper. The implementation level of XORing NC is selected based on LTE system, and an XORing NC Combined (XNCC) strategy is developed to perform combined retransmission. The main idea of proposed scheme is to retransmit lost packets for multiple receivers simultaneously utilizing NC technology. Moreover, we extend the proposed scheme to relay broadcasting system. The simulation results illustrate that compared with traditional retransmission scheme, the average number of transmissions of the proposed NC-HARQ scheme can be sharply decreased, and the coding gains can be attributed to the potential advantage of NC technology.