from    
to    
search  

 


第473期“工物学术论坛”:超构表面近远场电磁波前调控方法与应用
学堂班系列讲座:“气相分子和团簇化学键”
清华工业生物催化论坛-真菌多样性与国门生物安全
世纪物理情系列讲座(第27讲):A deep variational free energy approach to dens...
报告题目:
Acknowledgment (ACK) Pace for Maximum Throughput over
 报告人:
Ruhai Wang (王如海)
Department of Electrical Engineering
Lamar University
Beaumont, Texas, USA
报告时间:
2007-01-10 10:30
报告地点:
信息大楼(FIT)1区312
主办单位:
信息学院
  简介:

        The acknowledgement (ACK) strategy of Transmission Control Protocol (TCP) has been modified to delay the ACKs for a configurable period of time that is related to the round-trip time (RTT) to improve its performance over asymmetric links such as in space communications. A general relationship between the asymmetric channel ratio and the optimal ACK frequency to achieve maximum throughput is not available. In this talk, we discuss the optimal ACK frequency with respect to the channel RTT to achieve the maximum throughput over various asymmetric space communication links using a test-bed. We found that when the asymmetric channel ratio is as high as about 100/1, the optimal ACK frequency must be increased with an increase in asymmetric ratio to complement the impact of the reduction of ACK channel rate. As a rule of thumb, every two-fold increase in asymmetric ratio requires the optimal ACK frequency to be increased by one ACK per RTT. A regression model was built to reflect the relationship between the optimal ACK frequency and the asymmetric channel ratio and has been validated.

Dr. Wang has served as an Assistant Professor in Department of Electrical Engineering at Lamar University, Texas, USA, since 2002. He received his PhD in Electrical Engineering from New Mexico State University, USA, in 2001. Dr. Wang’s research interests are in computer networks and communication systems with emphases on wireless and space Internet, design/testing of Internet architecture and protocols, network modeling and performance evaluation. He has published about 40 papers in international journals and conferences proceedings. He currently serves as an editor for a few international journals. He has also served as one of the TPC co-chairs for IEEE ICC 2007 Wireless Communications Symposium.

 

Selected Recent Publications Related to the Talk

1.        S. Horan and R. Wang, “Design of a space channel simulator using virtual instruments software,” IEEE Transactions on Instrumentation and Measurement, vol. 51. No. 5, October 2002.

2.        R. Wang and S. Horan, “The impact of Van Jacobson Header Compression on TCP/IP throughput performance over lossy space channels,” IEEE Transactions on Aerospace and Electronic Systems, vol. 41, No. 2, April 2005.

3.        R. Wang, B. Gutha, S. Horan, Y. Xiao, and Bo Sun, “Which transmission mechanism is best for space Internet: window-based, rate-based, or a hybrid of the two?” IEEE Wireless Communications, vol. 12, No. 6, December 2005.

4.        R. Wang, S. Horan, and B. Tian, “Optimal acknowledgement frequency for maximum throughput over asymmetric space-Internet links,” IEEE Transactions on Aerospace and Electronic Systems, vol. 42, No. 4, October 2006.

5.        R. Wang, B. Gutha, and Paradesh Kumar Rapet, “Comparative analysis of window-based and rate-based transmission control mechanisms over point-to-point space communication links,” IEEE Transactions on Aerospace and Electronic Systems, December 2007 (to appear).

 

 

今日相关信息
Extraction and Application of Geometr...
Molecular dynamics simulations of nan...
侧观互联网
 
同类别相关信息
Identity, Privacy and Security in t...
金涌院士学术活动报告会:从诺贝尔奖谈创...
Interband Cascade Lasers and Relate...
请注意活动取消!Mixture sampling, s...
Interband Casecade Lasers and Relat...
学术活动