本项目研究使用LTE协助实现车联网中多媒体通信，通过对LTE、eMBMS和D2D等技术在车联网中的合理扩展，有效克服当前主流车联网协议在多媒体传输领域存在的缺陷。首先，通过细化车联网中多媒体服务种类并分析车对交通基础设施（V2I）和车对车（V2V）通信的特点，将车联网中多媒体传输归纳为V2I单播、V2I组播、V2V单播和V2V广播四种模式。接着，通过对各种传输模式下QoS主要影响因素的研究与分析，提出基于QoS驱动的智能调度算法，并采用系统级LTE模拟器进行仿真验证。本课题提出的调度算法具有三点优势：1)在延迟限制条件下实现小区内多媒体的可靠传输；2)通过对LTE网络硬切换和车联网频繁跨区切换的特殊处理，实现车辆跨区时的无缝切换；3)通过干扰避让资源调度算法实现V2I和V2V通信的频带资源共享。本课题的研究为车联网多媒体QoS传输的研发、实用化和标准制定提供理论依据、算法实现和实验验证。

With the world-wide deployment of LTE networks and its advanced technologies (e.g., eMBMS and D2D), LTE-assisted vehicular infrastructure has become a promising solution for broadband multimedia transmission over vehicular networks with the golden opportunity to overcome the drawbacks of the current WAVE/DSRC-based vehicular infrastructure. In this project, we aim at developing new scheduling mechanisms in order to provide QoS-aware multimedia services in LTE-assisted vehicular networks. We first summarize the multimedia transmission into four categories based on the user’s service requests and the characteristics of vehicular-to-infrastructure (V2I) and vehicle-to-vehicle (V2V) communication. Then we explore the major QoS metrics of multimedia delivery in each mode, and propose QoS-driven smart scheduling algorithms for multimedia transmission over LTE-assisted vehicular networks. In particular, the proposed scheduling algorithms can provide three-fold benefits: 1) QoS assured multimedia service with thorough consideration of multimedia delay constraints; 2) Seamless handover of multimedia services when a vehicle crosses the border of one LTE cell to another; 3) Proactive interference avoidance between V2I and V2V communications. The proposed project can provide a valuable guidance to the theory exploration, algorithm derivation and evaluation of QoS-oriented multimedia transmission over vehicular networks. In addition, the proposed framework and scheduling algorithms can be considered as references to the research and development, real-world implementation, and standardization of future smart vehicular networks.