WSN中层次型拓扑控制与网络资源配置联合设计方法

综合考虑异构无线传感器网络中节点速率分配、簇的划分规则和链路层网络频带资源占用情况, 提出一种基于拓扑控制与资源优化分配的层次型路由算法. 在网络层, 该算法根据成员节点和簇首节点的速率分配机制建立节点流量平衡模型. 在链路层, 分析无线传感器网络频谱共享行为, 研究邻近用户间访问冲突的规避抑制模型, 重构网络频带资源. 通过引入带宽比例因子将可用频带划分成若干子带, 提高网络频带资源的利用效率. 本文基于跨层联合设计思路, 建立一个混合整数非线性规划问题,对异构无线传感器网络中拓扑控制和网络资源分配问题联合设计, 得到最优的分簇结果和资源分配方案. 最后, 在设定网络拓扑中评估性能, 仿真结果证实该算法在网络频带资源充分利用的同时, 可实现最优的簇首匹配和路由建立结果.

A Joint Design Method of Hierarchical Topology Control and Network Resource Allocation for Wireless Sensor Networks

Considering flow routing rate, clustering rules, and resource consumption of network bandwidth, in this paper, we propose a routing algorithm based on topology control and resource allocation in heterogeneous wireless sensor networks. The algorithm establishes a model on flow rate balance in the network layer according to the rate allocation mechanism of the cluster heads and member nodes. In the link layer, an interference model is applied to analyze the sharing spectrum behavior and the resource reconfiguration. By introducing a bandwidth scaling factor ρ, the band is re-divided into several sub-bands, aiming at maximizing the utilization efficiency of frequency band resource. Based on the cross-layer design framework, we develop a mixed-integer nonlinear programming optimization problem to obtain the optimal clustering results and resource allocation scheme, while considering the networks topology and resource allocation. We evaluate the performance in a given network topology. The results show that the proposed routing algorithm can obtain the optimum match results and the optimal route while utilizing spectrum efficiently.