Robust Buffer Management Mechanism in Quality of Service Routers

Active queue management （AQM） is essentially a router buffer management strategy supporting TCP congestion control. Since existing AQM schemes exhibit poor performance and even instability in time delay uncertain networks, a robust buffer management （RBM） mechanism is proposed to guarantee the quali...

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Bibliographic Details
Published inShanghai jiao tong da xue xue bao Vol. 16; no. 4; pp. 452 - 458
Main Author 汪浩 成敏娟 田作华
Format Journal Article
LanguageEnglish
Published Heidelberg Shanghai Jiaotong University Press 01.08.2011
Subjects
Algorithms
Architecture
Buffers
Computer Science
Controllers
Delay
Electrical Engineering
Engineering
Life Sciences
Management
Materials Science
Networks
Routers
TCP (protocol)
congestion control
Smith predictor
active queue management (AQM)
TP 393
buffer management
quality of service (QoS)
Online AccessGet full text
ISSN1007-1172
1995-8188
DOI10.1007/s12204-011-1173-9

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Summary:Active queue management （AQM） is essentially a router buffer management strategy supporting TCP congestion control. Since existing AQM schemes exhibit poor performance and even instability in time delay uncertain networks, a robust buffer management （RBM） mechanism is proposed to guarantee the quality of service （QoS）. RBM consists of a Smith predictor and two independent controllers. The Smith predictor is used to compensate for the round trip time （RTT） delay and to restrain its negative influence on network performance. The main feedback controller and the disturbance rejection controller are designed as proportionalintegral （PI） controller and proportional （P） controller by internal model control （IMC） and frequency-domain analysis respectively. By simulation experiments in Netwrok-Simulator-2 （NS2）, it is demonstrated that RBM can effectively manage the buffer occupation around the target value against time delay and system disturbance. Compared with delay compensation-AQM algorithm （DC-AQM）, proportional-integral-derivative （PID） algorithm and random exponential marking （REM） algorithm, the RBM scheme exhibits the superiority in terms of stability, responsiveness and robustness.
Bibliography:31-1943/U
WANG Hao, CHENG Min-juan, TIAN Zuo-hua （1. Department of Automation, Shanghai Jiaotong University, Shanghai 200240, China; 2. School of Electronic and Information Enginering, Shenzhen Polytechnic, Shenzhen 518055, Guangdong, China）
Active queue management （AQM） is essentially a router buffer management strategy supporting TCP congestion control. Since existing AQM schemes exhibit poor performance and even instability in time delay uncertain networks, a robust buffer management （RBM） mechanism is proposed to guarantee the quality of service （QoS）. RBM consists of a Smith predictor and two independent controllers. The Smith predictor is used to compensate for the round trip time （RTT） delay and to restrain its negative influence on network performance. The main feedback controller and the disturbance rejection controller are designed as proportionalintegral （PI） controller and proportional （P） controller by internal model control （IMC） and frequency-domain analysis respectively. By simulation experiments in Netwrok-Simulator-2 （NS2）, it is demonstrated that RBM can effectively manage the buffer occupation around the target value against time delay and system disturbance. Compared with delay compensation-AQM algorithm （DC-AQM）, proportional-integral-derivative （PID） algorithm and random exponential marking （REM） algorithm, the RBM scheme exhibits the superiority in terms of stability, responsiveness and robustness.
congestion control, buffer management of service （QoS）
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ISSN:1007-1172
1995-8188
DOI:10.1007/s12204-011-1173-9