异构网络中的分层并发传输技术研究

Multi-RAT concurrent transmission technology can efficiently merge multiple network resources to guarantee the quality of service of data-hungry applications, which is the critically important basis for the future 5th generation mobile communication system. Firstly, starting with analyses the deficiencies of current single layer concurrent transmission network, we combine the multi-layer and dense deployment characteristics of the next generation mobile communication system, propose the hierarchical multi-node concurrent transmission theory, establish the cascaded queuing network model, and analyze the performance bound theoretically. Following the above fundamental research, we study the optimal decision making conditions for concurrent transmission，analyze the data splitting threshold for multiple parameters integration in the hierarchical multi-node concurrent transmission structure, jointly adjust data rate and radio resource allocation and attains the optimized coupling. Furthermore, we design the flexible data splitting scheme to guarantee the correct order for the end to end packets, propose the concurrent transmission mechanism which is transparent to transport layer protocol, and handle the service problem of data hungry application in the hierarchical multi-node concurrent transmission network. Finally, we develop simulation test platform and emulation systems, and evaluate and verify our proposed innovative theory and algorithms. This project will provide valuable theoretical foundation and technique reference for the hierarchical multi-node concurrent transmission in the next generation mobile communication system.

网络并发传输技术可有效聚合多种网络资源来保障大容量业务的服务质量，是未来5G通信系统的关键技术支撑。本项目首先从分析现有单层并发传输网络结构的缺陷入手，结合下一代移动网络多层、密集布设的特点，提出分层多点并发传输理论，建立级联的排队网络模型，分析其理论性能界；在此基础上，研究并发传输最佳启动条件问题，分析基于多点分层并传构架下多参数融合的分流门限，实现业务速率与资源分配的联动和优化耦合；更进一步地，设计保证端到端分组一致性的灵活数据分流策略，完成对传输层协议透明的并发传输机制，解决多点分层并传网络中的大容量业务传输问题；最后，开发仿真测试平台和实验验证系统，对所提理论和新型算法进行评估验证。本项目的研究为面向下一代网络的多点分层并发传输提供理论和技术支撑。

针对异构无线网络分层并发传输问题，本项目通过联合最优化理论和排队理论，对异构蜂窝网络和多跳异构无线自组织网络场景中的分层并发传输问题进行了建模和分析；利用多网络并传分级增益，分别研究了终端能效最优化理论、多网络干扰转移理论，和分层多跳网络中大容量业务的并传策略问题；进一步，针对研究中发现的多用户接入问题，提出了基于功率域的新型多址接入技术；并在此基础上研究了多用户并传的资源分配及用户调度问题，提出了最优功率层映射策略；最终，基于软件无线电平台的实验数据和软件仿真结果表明，本项目提出的异构网络中分层并发传输技术有效的提高了网络传输性能，为下一代网络中大容量业务服务质量保证提供了理论依据。本项目在国际重要期刊和会议上发表论文9篇，其中2篇属于中科院分区1区论文；申请发明专利7项，其中授权专利2项。综上所述，项目的研究成果为异构分层网络并发传输技术的规模化应用提供了理论基础和技术支撑。