基于跨层设计的矿山物联网感知层协作网络寿命优化

摘要

In order to meet the requirements of mine Internet of things( IoT)perception layer QoS,a wireless cooperative communication mechanism based on cross-layer design is proposed. In Nakagami-m fading channel, through cross-layer design of physical layer adaptive modulation coding( AMC)and link layer HARQ protocol, HARQ cooperation mechanism of wireless communication network is studied,and the total energy consumption expression of the cooperative transmission system is deduced,a cross-layer optimization model is established. A network lifetime maximizing power allocation algorithm( NLMPAA ) based on greedy strategy is proposed, optimize the power matrix under the premise of ensuring the bit error rate index and in range of maximum power constraint,maximize network lifetime. Simulation results show that the lifetime of network based on the cooperation mechanism is significantly better than that of the non cooperative network,the NLMPAA proposed in this paper can extend the network lifetime more than 20%.%为了满足矿山物联网感知层服务质量（ QoS）的要求，采用一种基于跨层设计的无线协作通信机制，在Nakagami-m衰落信道中，通过物理层自适应调制编码（ AMC）和链路层混合自动重传请求（ HARQ）协议跨层设计，研究无线通信网络的HARQ协作机制，推导出协作传输系统的总能耗表达式，建立跨层优化模型。基于贪婪策略的思想，提出一种网络寿命最大化的功率分配算法（ NLMPAA），在保证误码率指标的前提下，在最大功率的约束范围内，对功率矩阵进行优化，使网络寿命最大化。仿真结果表明：基于协作机制的网络寿命明显优于非协作机制网络，本文提出的NLMPAA可以延长网络寿命20%以上。