Cross-layer optimization schemes based on HARQ for Device-to-Device communication

The introduction of device-to-device(D2D) technology into LTE system could bring such mutual interferences between cellular users and D2D users that the instantaneous channel quality become worse in D2D communication. In this paper, with the purpose to make up for the link loss that caused by serious interferences and to optimize the performance of Device-to-Device communication, we consider a cross-layer framework which combines hybrid automatic repeat request(HARQ) protocol at the data link layer with the adaptive modulation and coding(AMC) technique at physical layer under the prescribed packet rate and average delay. At the same time, we compare the three types HARQ schemes in terms of throughput. Numerical simulation results illustrate that the application of type III HARQ could achieve the highest throughput and the performance of overall system is better than conventional scheme.