Enhancing congestion control to address link failure loss over mobile ad-hoc network

TL;DR

This paper proposes a transport-layer algorithm to detect link failure losses and improve congestion control in mobile ad-hoc networks, reducing unnecessary retransmissions and idle times.

Contribution

It introduces an end-to-end threshold-based algorithm that classifies link failure losses and adjusts RTO without cross-layer feedback, enhancing MANET performance.

Findings

Effective loss classification using ROTT and queue estimation.

Improved RTO adjustment for new routes after link failure.

Reduced retransmission overhead and idle time.

Abstract

Standard congestion control cannot detect link failure losses which occur due to mobility and power scarcity in multi-hop Ad-Hoc network (MANET). Moreover, successive executions of Back-off algorithm deficiently grow Retransmission Timeout (RTO) exponentially for new route. The importance of detecting and responding link failure losses is to prevent sender from remaining idle unnecessarily and manage number of packet retransmission overhead. In contrast to Cross-layer approaches which require feedback information from lower layers, this paper operates purely in Transport layer. This paper explores an end-to-end threshold-based algorithm which enhances congestion control to address link failure loss in MANET. It consists of two phases. First, threshold-based loss classification algorithm distinguishes losses due to link failure by estimating queue usage based on Relative One-way Trip Time (ROTT). Second phase adjusts RTO for new route by comparing capabilities of new route to the broken route using available information in Transport layer such as ROTT and number of hops.