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基于 TDMA 的网络层和 MAC 层车载自组织网络跨层设计研究
Thesis Advisor杨柳青
Degree Grantor中国科学院研究生院
Place of Conferral北京
      其次,针对车载自组织网络MAC层协议,本文提出基于无干扰图的MAC层调度方案(IG-TDMA)。该方案采用基于TDMA的中心式调度方法,由路边单元(RSU) 统一管理无线信道资源。在方案设计时,为充分利用空间资源,本文提出基于顶点权重的链路选择算法。该算法可以在有效的干扰控制下,实现多通信链路的同时传输。IG-TDMA方案可以减少数据包碰撞和拥塞,并且避免由竞争型MAC协议引起的暴露终端和隐藏终端问题,因而可以明显提高网络的吞吐量,改善网络性能。
Other Abstract
    The vehicular ad hoc network (VANET) is a type of mobile ad hoc networks consisting of vehicles and roadside units with onboard wireless communication equipment. VANET is an important part of intelligent transportation systems. Besides the benefits in terms of traffic safety and traffic congestion alleviation etc., real-time inter-vehicle communications can also provide entertainment services. Because of the promising future of the applications of VANETs, it has been attracting significant interest from both the industry and academia all around the world. Channel access on the media access control (MAC) layer and routing on network layer are key technologies in VANETs, which play decisive roles in improving the overall performance of the network. However, in the traditional layered protocols, information sharing between layers is strictly confined, hindering the improvement of network performance. Therefore, this paper is devoted to the studies on MAC layer protocols and network-MAC cross-layer design in VANETs. The more detailed research activities include:
    Firstly, analyses on existing VANETs protocols are conducted, including the MAC-layer protocols in the WAVE protocol stack, the existing network-MAC cross-layer design in the literature. Important problems and possible solutions of the current research are pointed out subsequently.
    Secondly, an interference-free graph based TDMA scheduling protocol (IG-TDMA) is proposed for VANETs. In this protocol, a TDMA-based centralized scheduling scheme is adopted, in which the wireless channel resources are allocated by the RSU. In this protocol, to better exploit the spatial resources, we propose a link section algorithm based on vertex weights in the interference-free graph. In this algorithm interference between these links is limited and simultaneous transmission of multiple communication links is implemented. IG-TDMA can mitigate packet collision and packet congestion. Moreover, it can avoid the problems of exposed terminals and hidden terminals. Therefore, this scheduling protocol can significantly improve the network throughput.
     Thirdly, the design of network-MAC cross-layer protocols is studied and aTDMA-based centralized network-MAC cross-layer design is proposed. Because in traditional layered protocols, the network layer can only interact with the MAC layer through specific interfaces, which impairs the traditional network layer routing schemes' capability to exploit MAC layer channel access characteristics, data transmission performance is restricted. Therefore, a joint routing and scheduling (JoRS) algorithm is proposed in this paper, in which routing on the network layer and scheduling on the MAC layer are jointly optimized. The performance of the proposed centralized cross-layer design is evaluated by simulations. Results demonstrate that it outperforms representative schemes in both categories of the centralized layered schemes and the distributed cross-layer schemes.
Document Type学位论文
Recommended Citation
GB/T 7714
朱燕燕. 基于 TDMA 的网络层和 MAC 层车载自组织网络跨层设计研究[D]. 北京. 中国科学院研究生院,2017.
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