TCP Throughput Improvement over Vertical Handover between 3G LTE and WLAN

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• 作者：Sujin Park (1) sulgician@lg-ericsson.com
  Ju-Wook Jang (2) jjang@sogang.ac.kr
• 关键词：3G LTE &#8211 ; Vertical handover &#8211 ; throughput optimization
• 刊名：Lecture Notes in Computer Science
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：6935
• 期：1
• 页码：64-71
• 全文大小：408.3 KB
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• 作者单位：1. Graduate School of Information and Technology, Sogang University, Shinsu-dong, Mapo-gu, Seoul, 121-742 Korea2. Department of Electronic Engineering, Sogang University, Shinsu-dong, Mapo-gu, Seoul, 121-742 Korea
• 刊物类别：Computer Science
• 刊物主题：Artificial Intelligence and Robotics
  Computer Communication Networks
  Software Engineering
  Data Encryption
  Database Management
  Computation by Abstract Devices
  Algorithm Analysis and Problem Complexity
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1611-3349

文摘

We address TCP throughput degradation over vertical handover between 3G-LTE and WLAN. 3G-LTE link layer tries to recover packet loss and deliver recovered packets in-order. This may involve link layer holding packets before later arriving packets arrive, causing spurious timeout. A state-of-the-art scheme holds fast retransmit/recovery for one RTT waiting for packets arriving at TCP layer out of order. We show this wait is unnecessary and costs TCP throughput. Our scheme is also able to improve TCP throughput by loss differentiation with parameters adapted to new network on vertical handover, considering link layer characteristics of 3G LTE which supports in-order delivery. Simulation result shows improved TCP throughput under various scenarios with TCP Reno and TCP SACK.