Cross-layer analysis of wireless TCP/ARQ systems over correlated channels

Abstract

In this paper we present a cross-layer analysis of wireless TCP systems over correlated channels. The effects of error correlation on the behavior of link retransmission strategy and the end-to-end throughput of TCP layer are investigated. Based on the cross-layer analysis, an efficient refinement of link layer protocol is proposed by consciously utilizing the information of channel correlations, which leads to the performance improvement of wireless TCP systems.

Modeling TCP SACK performance over wireless channels with semi-reliable ARQ/FEC

“…It was shown that the throughput of the wireless channel is an increasing function of the persistency of ARQ. In [17], the authors analyzed TCP throughput over a wireless channel with a NAK-based SR ARQ scheme in the presence of correlated errors at the physical layer. They observed that the TCP throughput mainly depends on the throughput limit of the wireless data link layer, the residual packet loss rate after data link layer retransmissions, and the correlation degree of residual losses.…”

“…An analytical model, capturing the joint effect of SR ARQ and FEC on TCP performance over a correlated Rayleigh wireless channel, was presented in [18]. One of the main advantages of this model is that it uses wireless channel related characteristics (the signal to noise ratio and the Doppler shift) to parameterize the service process of the wireless channel, while the other models [15][16][17] require the frame error rate to be given.…”

Modeling TCP SACK performance over wireless channels with completely reliable ARQ/FEC

“…It was shown that the throughput of the wireless channel is an increasing function of the persistency of ARQ. In [15], the authors analyzed the TCP throughput over a wireless channel with NAK-based SR ARQ in the presence of correlated errors at the physical layer. They observed that the TCP throughput mainly depends on the throughput limit of the wireless data link layer, the residual error probability after data link layer retransmissions, and the correlation degree of the residual errors.…”

“…An analytical model, capturing the joint effect of SR ARQ and FEC on TCP performance over a correlated Rayleigh wireless channel, was presented in [16]. One of the main advantages of the model is that it uses wireless channel-related characteristics (the signal to noise ratio and the Doppler shift) to parameterize the service process of the wireless channel, while the other models [13][14][15] require the frame error rate to be given.In this paper, we consider the performance of a TCP SACK connection running over a wireless channel with completely reliable ARQ/FEC as a function of the bit error rate (BER), the normalized autocorrelation function of bit error observations at lag 1 (lag-1 NACF), the strength of the FEC code, the use of ARQ, the size of protocol data units at different layers, the raw data rate of the wireless channel, and the bottleneck link buffer size. The wireless channel characteristics are assumed to be covariance-stationary and modeled by a homogenous Markov process.…”

“…An analytical model, capturing the joint effect of SR ARQ and FEC on TCP performance over a correlated Rayleigh wireless channel, was presented in [16]. One of the main advantages of the model is that it uses wireless channel-related characteristics (the signal to noise ratio and the Doppler shift) to parameterize the service process of the wireless channel, while the other models [13][14][15] require the frame error rate to be given.…”