基于SDWN的负载感知终端多点关联方案研究

Research on terminal multi-point association scheme based on load-aware in SDWN

软件定义无线网络(SDWN)是一种控制与转发分离的无线网络架构。该架构可以快速获取全局拓扑,并且其可编程性结合资源虚拟化技术可以对网络接入进行动态控制。针对现有WLAN网络接入负载不均衡问题以及移动终端与AP硬关联导致的切换速度较慢的问题,基于SDWN架构提出了一种负载感知终端多点关联方案。该方案对SDWN网络架构下的终端接入算法进行改进,采用多点关联技术,即终端在感知AP负载数据后,可关联多个虚拟AP,达到动态分流并提高网络吞吐量的目的。最后在SDWN的开源Odin平台上验证了方案的可行性。实验表明,相比无缝切换至另一AP,此方案可改变原有终端与AP接入一一对应的接入关系,根据AP负载动态接入能有效提升网络吞吐量。

Software defined wireless network (SDWN) is a wireless network architecture that separates control plane and forward plane. It can get global topology quickly and its programmable combined with resource virtualization technology can control network access dynamically. In order to solve the problem of unbalanced load in existing WLAN and handover problem caused by the hard association between mobile terminal and AP, this paper proposed a terminal multi-point association scheme based on load-aware in SDWN. This scheme improved the seamless handoff algorithm between AP based on traffic load perception. When sensing AP load, the terminal could connect multiple virtual APs to achieve dynamic diversion. Finally, it verified this scheme on an experimental platform. Experiments show that this scheme changes the relationship between the terminal and the AP one by one compared to seamlessly switching to another AP, and it effectively improves the terminal network throughput.