Design and Implementation of a Bandwidth Control Mechanism for Personal Wireless Routers
Date Issued
2014
Date
2014
Author(s)
Lin, Yu-cheng
Abstract
Due to the development of smartphones and tablets, the population of smart handheld grows up with a numerous speed in the passing years. Many other mobile Internet devices, such as wearable devices and sensors, have also appeared constantly. The number of mobile Internet devices per person is observed to follow an ascending trend, and various applications are under development. One of the current important issues is how to use the bandwidth resources more effectively to improve user experience when all devices compete for the scarce resource.
In this thesis, we focus on the network architecture with a personal wireless router as the center of personal devices that offers Internet access over a wireless small area network. We aim to resolve related QoS problems by implementing bandwidth control mechanism on the personal wireless router. We made careful assessments and tests on key items of this architecture, including operating system on mobile devices, technologies of traffic control, bandwidth estimation and some measurement tools. The concept, methods and setup we choose to use in this thesis will be described, and testing results of every component are illustrated.
We designed a mechanism called Dynamic Bandwidth Sharing Mechanism for Multiple Devices (MD-DBS) and implemented it on Android devices. MD-DBS consists of three major components: Event Triggers, Bandwidth Estimation and Traffic Control. The Event Triggers detect specific events of each mobile device and deliver necessary information to the router. The router can start or terminate the mechanism, and even reset the parameters dynamically, then it uses Bandwidth Estimation based on modified WBest to measure the available bandwidth. WBest was the chosen probing technology based on the packet pairs approach. The outputs of Bandwidth Estimation, instant information and QoS Tables were used for calculating proper parameters for controlling the bandwidth. Finally, we use the proposed Traffic Control mechanism based on the Hierarchical Token Bucket algorithm to effectively control the bandwidth.
The proposed mechanism, MD-DBS, was evaluated under several usage scenarios and environments. We also compared the results with those under the default setting. By measurement results, we could observe that MD-DBS could improve user experiences and make applications work better. In addition, there was almost no significant computation overhead for devices using MD-DBS.
Subjects
頻寬控制
個人無線路由器
安卓
網路電話
Type
thesis
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