软件定义Mesh接入网中带宽敏感数据的传输策略研究

With the widespread use of various smart mobile devices and emerging mobile applications, mobile data especially the bandwidth-sensitive data are growing with explosive speed, thus, great challenges are presented to the wireless mesh access network, which is mainly responsible for data access. However, due to the complex network control and inefficient use of resources, the performance of traditional mesh access networks cannot satisfy the requirement of transmitting the bandwidth-sensitive data. Therefore, it is urgent to reconstruct the architecture and enhance the transmission performance of traditional mesh access network. Software defined networking (SDN) is an effective and viable solution for constructing a novel network control model, configuring the network resource optimally, controlling the network flexibly, and defining the programmable transmission strategies. Unfortunately，the current research on software defined mesh access network is in the stage of exploration and attempt. Facing with such opportunistic, this project mainly focuses on the transmission strategies for bandwidth-sensitive data in software defined mesh access network. First, by constructing the software defined mesh access network architecture, the objective of flexible network control and efficient use of resources can be achieved. Second, the information of network states can be collected by investigating the scheme of network measurement and management. These collected network information can provide the basis for customizing the related transmission strategies. Finally, based on the software defined network architecture and network state information, the network service with QoS/QoE guarantee can be provided for bandwidth-sensitive data through a set of strategies, including software defined transmission scheme, fine-grained network control, centralized optimize and utilize the network resources.

随着移动智能设备的广泛普及，移动数据特别是带宽敏感数据正以爆炸式的速度增长，这对承担主要接入任务的Mesh接入网提出了极大挑战。传统网络架构由于控制复杂、资源利用率低的问题，难以应对带宽敏感数据的需求。采用软件定义网络技术可重构Mesh接入网的控制模式，实现资源的优化配置、网络的灵活控制，及传输策略的软件定义，是一种有效且可行的方案。当前针对软件定义Mesh接入网的研究正处于探索和尝试阶段。面对此研究契机，本项目以软件定义Mesh接入网中带宽敏感数据的传输策略为研究对象。首先，通过建立软件定义的Mesh接入网架构，实现网络的灵活控制及资源的高效利用；然后，通过对网络状态信息测量和管理的研究，实现网络状态信息的收集，为控制层定制相关的传输策略提供依据；最后，基于软件定义的Mesh网架构，提出软件定义的数据传输机制，实现网络的细粒度控制及资源的优化利用，为带宽敏感数据的传输提供保障。

移动智能设备的广泛普及以及移动数据特别是带宽敏感数据正以爆炸式的速度增长，对无线Mesh接入网的性能提出了极大挑战。采用软件定义网络技术可重构Mesh接入网的控制模式，实现资源的优化配置、网络的灵活控制，及传输策略的软件定义，是一种有效且可行的方案。因此，本项目以软件定义Mesh接入网中带宽敏感数据的传输策略为研究对象。具体的，首先在软件定义的无线Mesh接入网架构方面，通过将软件定义网络的思想应用于无线Mesh网络中，从根本上解决了网络操作复杂的问题，并且为网络控制和数据传输提供了灵活高效的编程接口。其次，基于软件定义的Mesh接入网架构，通过SDN控制器来收集网络状态信息，进而设计相关的网络测量与接入管理机制，从而为带宽敏感数据传输提供网络性能支持。最后，基于软件定义的无线网络架构，从不同角度设计了一系列的数据转发策略，为带宽敏感数据传输提供QoS/QoE的保障, 包括路由、接纳控制，信道速率选择，码率自适应，网络编码等等。同时，为了验证上述所涉及的机制或算法的正确性和有效性，除了采用传统的仿真方法以外，本项目还搭建了基于硬件设备的原型系统，并对部分新机制在真实系统下实现、运行的可行性及相关新机制的性能进行了分析和评估。通过上述研究，本项目在软件定义无线Mesh 网络带宽敏感数据传输机制方面取得了一系列成果。