Effect of Proxy Nodes on the Performance of TCP-Based Transport Layer Protocols in Wireless Sensor Networks

TL;DR

This paper investigates how proxy nodes near sinks can enhance TCP performance in Wireless Sensor Networks, showing significant improvements in throughput and packet delivery ratio despite increased delay.

Contribution

It introduces the use of proxy nodes near sinks to improve TCP-based transport protocol performance in WSNs, a novel approach not extensively studied before.

Findings

Throughput increased by 20-50% with proxy nodes

Packet delivery ratio improved significantly

Average message delay roughly doubled

Abstract

Wireless Sensor Networks have recently attracted many researchers attentions due to their wide range of applications. Even though a plethora of studies have been carried out on characteristics, special conditions, and various aspects of WSNs, transport protocol which is compatible with conditions of Wireless Sensor Networks has not been considerably addressed. Wireless Sensor Networks have limitations such as storage space, energy resources, and wireless communication issues. Accordingly, widely-used transport protocols like Transmission Control Protocol (TCP) may not enjoy sufficient efficiency in such networks. In this paper, we study the characteristics of WSNs leading to design transport layer protocol for WSNs and aim at evaluating the efficiency of TCP and its dependent protocols (TCP variables), which are introduced to wireless networks. We propose to employ proxy nodes near sinks to improve the performance of transport layer. Our NS-2 simulation results indicate that throughput and packet delivery ratio are improved from 20 to 50 percent after employing proxy nodes, while the average message delay is almost increased twice.