本项目以下一代异构无线局域网中的性能优化为核心问题，围绕理论建模与分析，性能优化与服务质量保证，多接入点网络场景干扰研究和软件定义无线局域网原型系统四个方面进行研究。首先，采用创新的建模思想，提出对无线节点报文队列首报文完整行为进行建模，针对基于IEEE 802.11e EDCA和最新的IEEE 802.11aa/ac标准的异构无线局域网建立统一理论模型；其次，深入研究最大化网络吞吐量，满足目标服务区分要求和提供多样化服务质量保证等关键性能优化问题；再次，面向多接入点网络场景，研究在相邻基本服务集交叠节点互相干扰下，如何通过多接入点的协作机制进行全局网络优化；最后，设计和实现软件定义无线局域网原型系统，评测所提出的性能优化理论。本项目可望为实现可优化、可协作、可提供服务质量保证的下一代异构无线局域网的网络架构和协议设计提供理论指导。

In this project, we propose to study the performance optimization issues of the next-generation heterogeneous wireless local area networks (WLANs), including the analytical modeling, the performance optimization and quality-of-service guarantee, the interference analysis under multiple-access-point network scenarios and the prototype system of software defined WLANs. First of all, we plan to adopt a novel modeling methodology and model the entire behavior of the head-of-line packet in each node’s queue. Based on this methodology, a unified analytical model will be established for the heterogeneous IEEE 802.11e EDCA networks and the latest IEEE 802.11aa/ac networks. Secondly, a series of key performance optimization problems will be further studied, including how to properly adjust the system parameters to achieve the maximum network throughput, to maintain target service differentiation requirement, and to provide quality-of-service guarantee among various prioritized traffic flows. Moreover, we plan to extend our analysis to multiple-access-point WLAN scenarios, and discuss how to optimize the network performance globally with interfering nodes in overlapping basic service sets by access point cooperation. Finally, we plan to design and implement a software defined WLAN prototype, and examine the feasibility and accuracy of our performance optimization analysis. Our research may provide insights into the network configuration and protocol design of the next-generation heterogeneous WLANs with performance optimization, access point cooperation and quality-of-service guarantee.