A DCCP Congestion Control Mechanism for Wired- cum-Wireless Environments

TL;DR

This paper introduces a new DCCP congestion control mechanism tailored for wired and wireless networks, improving bandwidth efficiency by implicitly distinguishing congestion from wireless losses, with significant performance gains demonstrated through NS-2 simulations.

Contribution

The paper presents the first implementation of an implicit loss discrimination mechanism within DCCP's CCID framework for heterogeneous networks.

Findings

Bandwidth utilization improved by over 30%

Performance gains up to 50% in key scenarios

Effective congestion and wireless loss discrimination

Abstract

Existing transport protocols, be it TCP, SCTP or DCCP, do not provide an efficient congestion control mechanism for heterogeneous wired-cum-wireless networks. Solutions involving implicit loss discrimination schemes have been proposed but were never implemented. Appropriate mechanisms can dramatically improve bandwidth usage over the Internet, especially for multimedia transport based on partial reliability. In this paper we have implemented and evaluated a congestion control mechanism that implicitly discriminates congestion and wireless losses in the datagram congestion control protocol (DCCP) congestion control identification (CCID) framework. The new CCID was implemented as a NS-2 module. Comparisons were made with the TCP-like CCID and showed that the bandwidth utilization was improved by more than 30% and up to 50% in significant setups.