An efficient retransmission scheme for data sharing in D2D assisted cellular networks

System performance of cellular networks could be improved by D2D communication. A retransmission scheme within D2D group is proposed for the case of data sharing. When all the D2D UEs failed to get data packet from BS by cellular links, retransmission is still carried out within the group. Because of the enhancement of receiving SNR, a UE could decode the data with a higher probability. Analysis and simulation indicates that the proposed scheme could save the resource of cellular links with a little bit more D2D link resource consumption.