基于信息年龄优化的多信道无线网络调度方法

信息年龄(AoI)是近年来针对时间敏感类应用所提出的一种描述数据交付及时性的度量标准,它是从网络中目标节点的角度出发,衡量其最新收到的数据包的新鲜程度.在信道资源受限的多信道无线网络场景中,基于信息年龄的链路调度问题需要考虑信道资源和链路冲突的约束.针对上述问题,该文提出一种逐时隙调度链路进行数据传输的调度方法,以最小...

Scheduling Method for Multi-channel Wireless Networks Based on Optimization of Age of Information

Age of Information (AoI) is a novel metric that describes the timeliness of data delivery for time-sensitive applications, which measures the freshness of the most recently received packet from the perspective of destination node. In the multi-channel wireless network scenario with limited channel resources, the constraints of channel resources and link conflicts should be considered in the link scheduling with respect to AoI. To address this issue, in this paper, a time slot based scheduling method for data transmission to minimize the average AoI in the network is proposed. In this method, the optimization problem of AoI is first formulated into a Lyapunov optimization problem. Then the multi-channel conflict problem is converted to find the maximum matching policy of bipartite graph, which is solved by Kuhn-Munkres (KM) algorithm. Thus, a scheduling policy under constraints is obtained. The simulation results demonstrate that the proposed method optimizes effectively the average AoI and improves the freshness of data in the network.