基于车载异构网络的接入选择策略研究

发布时间：2018-01-04 23:20

  本文关键词：基于车载异构网络的接入选择策略研究　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： VHN 接入选择 定价策略 合作博弈理论

【摘要】：随着车载网络的迅速普及以及配备无线通信技术的车辆数据的增加,道路中的数据交换变得越来越值得关注。车载异构网络(VHN,Vehicular Heterogeneous Network)作为无线车载网络中特殊的一种,既具有一般车载网络的特点,同时也具有一般无线异构网络的特征。因此,在车载异构网络中,节点选择接入网络的策略十分重要。现有的车载异构网络节点接入网络的方式,通常都是采用自主下载的方式,通过对周围网络的探测和评估,选择最符合自己需求的网络,然后通过切换技术接入到所选定的网络进行数据下载。但在实际应用中,同一段道路中的车辆往往可以通过合作的方式共同下载所需的应用,以达到降低接入代价的目标。本文针对车载异构网络中节点通过合作方式进行数据下载的情况,提出了两种接入选择策略:独付式接入选择策略和分摊式接入选择策略。独付式接入选择策略主要针对有且仅有需求节点有数据下载的需求的场景,该策略包括了基于合作博弈理论中夏普利公式的定价策略和选择接入节点的接入节点确认机制。而分摊式接入选择策略则是针对需求节点的周围节点同样有该数据下载的需求的场景,该策略中的成交价格是根据各个车辆自主接入时的代价占总代价的比例来进行定价的,而接入节点确认机制与独付式接入选择策略相似,综合考虑成交价格和性价比这两种参数,选择出最符合自己需求的节点与之合作,完成数据的下载,从而以较低的价格获得有质量的服务。本研究通过MATLAB仿真工具,首先分别比较了独付式接入选择策略和分摊式接入选择策略中价格参数和性价比参数的比例调整对接入节点确认机制的性能的影响情况,然后将两种接入选择策略分别与现有的垂直切换策略在成交价格和性价比方面进行了比较,最后考虑当需求节点的周围节点同时存在对应用感兴趣和不感兴趣的节点,即独付式接入选择策略和分摊式接入选择策略同时被使用的情况,比较不感兴趣的节点比例的变化对成交价格和性价比的影响。实验结果表明,车载异构网络独付式接入选择策略和分摊式接入选择策略都能够在保证服务质量的同时降低接入成本,同时,为了尽可能的降低成交价格和提高服务质量,需求节点会尽可能的选择采用分摊式接入选择策略的周围节点合作下载数据。
[Abstract]:With the rapid popularization of vehicle network and increase vehicle data equipped with wireless communication technology, road data exchange becomes more and more worthy of attention. On heterogeneous networks (VHN, Vehicular Heterogeneous Network) is a kind of special wireless vehicular networks, both the characteristics of general vehicle network, but also has the general characteristics of wireless heterogeneous in vehicle network. Therefore, heterogeneous network, access network node selection strategy is very important. The existing vehicle heterogeneous network nodes, usually using independent download mode, through the detection and assessment of the surrounding network, choose the most in line with the needs of their own network, and then through the switch to access technology the selected network to download the data. But in practical application, the same section of the road in the vehicle can often through the way of cooperation and common under the load required The application, in order to reduce the access cost target. According to the vehicle nodes in heterogeneous network to download data by way of cooperation, put forward two kinds of access selection strategy: single type access selection strategy and allocation type access selection strategy. The type of access selection strategy for and only needs node demand data download the scene, the strategy includes the access node in the cooperative game theory formula of Shapley pricing strategy and choice of access node confirmation mechanism based on sharing type. Access selection strategy is for the nodes around the node also needs the demand for data download of the scene, the price strategy is based on each vehicle autonomous access when the cost of the total cost of the proportion of pricing, and the access node and the payment confirmation mechanism access selection strategy is similar to that of considering the transaction The price and cost of these two parameters, choose the most in line with the needs of their cooperation with the node, data download, so as to obtain quality service at low prices. This research by MATLAB simulation tools, first compare the single type of access selection strategy and pricing strategy in the selection of parameters and the parameters of price points the adjustment of the ratio of share access to the access node confirm the mechanism of the influence of performance, and then two kinds of access selection strategy and Vertical Handoff Strategy Existing in the price and the price are compared, finally consider when demand nodes around the nodes exist at the same time node for the application is interested in and are not interested in, i.e. only pay access selection strategy and allocation type access selection strategy is used at the same time, changes in node proportion are not interested in the comparison of the price and the price. The experimental results show that the single type vehicle heterogeneous network access selection strategy and allocation type access selection strategy can reduce the cost of access, in ensuring the quality of service at the same time at the same time, in order to reduce prices and improve the quality of service, the node needs to choose will make possible the use of shared access selection strategy around node cooperation download the data.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
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本文编号：1380556