Active Queue Management (AQM): Congestion Control

Thanks to rapid growth in internet traffic, Active Queue Management (AQM) is intensively researched by several experts. Having said that, little is known regarding AQM in satellite networks. In this project report, we will look into the queueing behavior in satellite networks to spot difficulties with using present Active Queue Management AQM methods. A new AQM technique is suggested to get over the difficulties and it is verified using a practical emulation environment and a mathematical model. Three issues which were found during the research are mentioned in this project. The initial issue is oscillatory queueing, that is due to high buffering thanks to Performance Enhancing Proxy (PEP) in satellite networks where congestion control after the PEP buffering doesn’t efficiently control traffic senders. Present Active Queue Management AQMs which can solve this challenge have tail drop queueing which leads to consecutive packet drops (global synchronization) ….

Contents: Active Queue Management (AQM) and Congestion Control

Chapter 1 Introduction
1.1. Internet over Satellite
1.2. Overview of Active Queue Management AQM
1.3. Statement of the Problems
1.3.1. Asynchronous Queueing and Global Synchronization
1.3.2. Fair Bandwidth Sharing
1.3.3. Buffer Flow Control Instability
1.4. Contributions
1.5. Dissertation Organization
Chapter 2 Background and Related Work
2.1. Overview of PEP
2.2. Overview Active Queue Management AQM Methods
2.2.1. RED
2.2.2. SRED
2.2.3. Yellow
2.2.4. CHOKe
2.2.5. VRC
2.2.6. AVQ
2.2.7. VQ-RED
2.2.8. REDFC
2.3. Overview of Active Queue Management AQM Marking Methods
2.4. Summary
Chapter 3 Emulation Framework
3.1. Components and Traffic
3.2. Evaluation Methodologies
3.3. Parameter Settings
Chapter 4 Asynchronous Queueing and Global Synchronization
4.1. Problems
4.2. Solution
4.2.1. Parameter Settings
4.3. Emulation Results
4.3.1. Link Utilization
4.3.2. Queue Size
4.3.3. Packet Drop
4.4. Mathematical Model
4.5. MATLAB Results
4.6. Summary
Chapter 5 Fair Bandwidth Sharing
5.1. Problem
5.2. Solution
5.2.1. Parameter Settings
5.3. Emulation Results
5.3.1. Packet Drops
5.3.2. Per-flow Throughput
5.4. Summary
Chapter 6 Buffer Flow Control Instability
6.1. Problems
6.2. Solution
6.3. Emulation Results
6.3.1. Output Link Utilization
6.3.2. Input Link Utilization
6.3.3. Transmit Queue Size
6.3.4. Marking Probability
6.4. Mathematical Model
6.5. MATLAB Results….

Source: UMD

Leave a Comment