A Software Defined Multi-Path Traffic Offloading System for Heterogeneous LTE-WiFi Networks
A Software Defined Multi-Path Traffic Offloading System for Heterogeneous LTE-WiFi Networks
复制标题
适用于异构 LTE-WiFi 网络的软件定义多路径流量卸载系统
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
M. Gerla
中科院分区：
文献类型：
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作者：
Pengyuan Du;Qi Zhao;M. Gerla
不断增长的移动的用户、设备和应用导致当今巨大的移动的网络流量。当前的蜂窝网络基础设施正面临着缺乏足够带宽的问题。许多现有的工作提出通过将移动的业务卸载到无线局域网来解决这个问题。然而，传统的单路径通信由于用户移动性引起的网络切换而限制了业务卸载性能。为了进一步探索异构移动的网络中流量分流的优势和潜力，本文提出了一种基于软件定义和多路径的LTE-WiFi流量分流网络聚合系统。我们的系统依赖于多路径TCP和软件定义网络技术：前者运行在移动的设备上，通过多个网络连接创建TCP子流，而后者则通过集中控制器引导这些子流，以正确使用网络带宽。为了获得适当的带宽分配，我们制定流量卸载作为一个网络优化问题。此外，控制器配置每个无线电接入网络中的子流的速率以优化负载均衡和公平性的目标。所设计的控制器还可以响应网络状态的变化，集中式的设计有利于网络资源管理和策略制定。我们的流量卸载系统的原型实现使用网络仿真器Mininet-WiFi。仿真结果证明了该算法在异构LTE-WiFi网络中吞吐量最大化、公平性和服务连续性方面的有效性。
Ever growing mobile users, devices and applications lead to tremendous volume of mobile network traffic nowadays. Current cellular network infrastructure is facing the problem of lacking sufficient bandwidth. Many existing works propose to solve this issue by offloading mobile traffic to wireless local area network. However, traditional single path communications limit the traffic offloading performance due to the network handoff caused by user mobility. To further explore the benefits and potential of traffic offloading in heterogeneous mobile networks, we develop a software-defined and multipath-based network aggregation system specifically for LTE-WiFi traffic offloading in this paper. Our system relies on Multipath TCP and Software-Defined Networking technologies: the former is run on mobile devices to create TCP subflows over multiple network connections, while the latter is leveraged to direct those subflows for proper usage of network bandwidth via a centralized controller. To obtain the appropriate bandwidth allocation, we formulate traffic offloading as a network optimization problem. Furthermore, the controller configures the rate of subflows in each radio access network to optimize the objective of load balancing and fairness. The devised controller is also responsive to network status change, and the centralized design facilitates network resource management and policy making. A prototype of our traffic offloading system is implemented using network emulator Mininet-WiFi. Emulation results prove its efficiency in throughput maximization, fairness, and service continuity in heterogeneous LTE-WiFi networks.