How to get good TCP performance over asymmetric networks

11/17/99


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Table of Contents

How to get good TCP performance over asymmetric networks

Motivation

When is a network asymmetric?

Why is this a problem for TCP?

TCP Overview

TCP Dynamics

Typical Performance

Bandwidth Asymmetry

Problems

Hybrid Wireless Cable

Latency Asymmetry: Packet Radio Networks

MAC Protocol Interactions

Problem: Large Round-Trip Time Variations

Solutions

ACK Filtering (AF)

ACK Congestion Control (ACC)

ACK Congestion Control (ACC)

ACK Congestion Control (ACC)

ACK Congestion Control (ACC)

Sender Adaptation (SA)

ACK Reconstruction (AR)

Performance: Bandwidth Asymmetry

Multihop Wireless Simulations

Single TCP Transfer

Concurrent Transfers

Combining Technologies

Status

Cross-layer optimizations

Summary

 Author: Hari Balakrishnan

Email: hari@lcs.mit.edu

Home Page: http://wind.lcs.mit.edu/

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