Cooperative Network Coded ARQ Strategies for Two Way Relay Channel

TL;DR

This paper introduces novel cooperative ARQ strategies with network coding for two-way relay channels, significantly improving throughput over traditional methods, especially in slow to moderate fading channels, by reducing retransmissions.

Contribution

It proposes new cooperative ARQ methods integrating network coding, analyzing their performance with correlated channel models, and demonstrating throughput improvements over existing approaches.

Findings

Network coding enhances ARQ throughput.

Correlation impacts cooperative ARQ performance.

Proposed methods outperform traditional ARQ.

Abstract

In this paper, novel cooperative automatic repeat request (ARQ) methods with network coding are proposed for two way relaying network. Upon a failed transmission of a packet, the network enters cooperation phase, where the retransmission of the packets is aided by the relay node. The proposed approach integrates network coding into cooperative ARQ, aiming to improve the network throughput by reducing the number of retransmissions. For successive retransmission, three different methods for choosing the retransmitting node are considered. The throughput of the methods are analyzed and compared. The analysis is based on binary Markov channel which takes the correlation of the channel coefficients in time into account. Analytical results show that the proposed use of network coding result in throughput performance superior to traditional ARQ and cooperative ARQ without network coding. It is also observed that correlation can have significant effect on the performance of the proposed cooperative network coded ARQ approach. In particular the proposed approach is advantageous for slow to moderately fast fading channels.