软件定义的VANET下流表用量感知的QoS路由机制  

A Flow Table Usage-Aware QoS Routing Mechanism in Software Defined VANET

作　　者：付彬 查理佳[1,2] 李仁发 肖雄仁 

机构地区：[1]湖南大学信息科学与工程学院,长沙410082 [2]嵌入式与网络计算省重点实验室(湖南大学),长沙410082

出　　处：《计算机研究与发展》2017年第11期2628-2638,共11页Journal of Computer Research and Development

基　　金：国家自然科学基金项目(61502162);中央高校基本科研业务费专项资金项目(531107040289)~~

摘　　要：VANET可以提供各类安全和非安全相关的服务,但现有的VANET难以保障应用服务的QoS需求.软件定义网络(software defined networking,SDN)以系统化的灵活控制网络的方式出现,其分离的数据与控制平面为网络带来了可编程性.因此首先设计了一种面向异构多网接入的软件定义的VANET架构;接着提出一种流表用量感知的动态QoS保障框架,允许使用模块化的方式管理网络,并支持业务流的动态加入和退出;最后建立了多业务流多约束条件下流表用量感知的QoS路由模型,该模型不仅考虑了丢包、时延和吞吐量等链路参数,还考虑了业务需求和流表使用情况,从而为VANET应用服务提供并发的QoS路由.实验表明:流表用量感知的动态QoS路由机制不仅能够满足多业务对各自丢包、时延和吞吐量的要求,还能够感知流表用量,从而避免流表溢出对QoS路由机制的影响,进一步提高了网络QoS保障的性能.VANET can provide a wide range of security and nonsecurity related services. However, the existing VANET is difficult to guarantee the QoS of these services. Software defined networking （SDN）, which appears in a systematic way, can control network flexibly and separate the data from the control plane, bringing programming ability to the network. Firstly, this paper designs a software defined VANET architecture for heterogeneous multi network access. Secondly, a flow table usageaware dynamic QoS provisioning framework is proposed, which allows us to manage the network in a modular way and supports the dynamic entering and exiting of the service flows. Finally, this paper establishes a flow table usageaware QoS routing model with multiservice flows and multiconstraints. The model considers not only the parameters of link state such as packet loss, delay and throughput, but also the service requirements and the flow table usage, and provides VANET application services for a concurrent dynamic QoS routing. Experiments show that QoS routing mechanism proposed in this paper can meet not only the service requirements of their packet loss, latency and throughput, but also the capable of perceiving the usage of flow table so as to avoid the influence of flow table overflow for QoS routing mechanism, which further improves the performance of network QoS.

关 键 词：软件定义网络 车辆自组织网络 服务质量 路由模型 流表 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]