Buffer-aided and weight-based non-orthogonal network coding for wireless broadcasting

Abstract

Buffer-aided network coding (NC) has been proposed as an effective method to improve retransmission efficiency. In this way, the correctly received undecodable NC combined retransmission packets are waited in the buffer for a future network decoding opportunity rather than delete. However, existing buffer-aided approaches fail to consider the buffer status and the latest feedback in the next round of network encoding and therefore are unable to achieve the optimal performance. In this paper, a buffer-aided and weight-based non-orthogonal network coding scheme for wireless broadcasting (BWNNC) has been proposed, wherein the sender makes full use of all the known information to conduct non-orthogonal network coding retransmissions. Simulation results show that our proposed algorithm indeed outperforms previous works in reducing the retransmission times.