Research And Implementation Of Embedded IOT Gateway And Ad Hoc Network

A perception network based on low-cost,high-efficiency,medium-and short-distance communication technologies can make up for the shortcomings of high-cost telecommunications networks.The IOT(Internet of Things,IOT)gateway with strong computing capability can cooperate with the sensor network nodes to make the network have the capabilities of calculation,control,acquisition,and execution.The mobile ad hoc network of the gateway nodes is of great significance to realize the local subnet connection and expand the coverage of the medium and short distance in Internet of Things.This thesis designs an embedded IOT gateway and studies the self-organizing network technology of the WIFI gateway?Due to the limited computing power and energy of the embedded platform,the routing protocol is the key to whether the IOT gateway can efficiently network.The thesis analyzes and optimizes the on-demand distance vector routing protocol to improve the networking ability of the IOT gateway.The main work of the thesis is as follows:1.Based on OSD3358 microprocessor,an IOT gateway is designed and the AODV routing module is implemented on the gateway platform.The embedded gateway includes a microprocessor module,a wireless module,a data acquisition and processing module,a storage module,a power module and other parts.The WIFI connection of the gateway is realized based on the WL1835MOD wireless module.Under the Linux operating system,the AODV routing protocol is cross-compiled and transplanted to complete the networking test.2.In order to improve the performance of the routing protocol,the AOMDV routing protocol based on AODV extended is studied and simulated.The simulation of AODV protocol and AOMDV protocol is realized by the network simulator platform.Simulation results show that the AOMDV protocol has lower network delay and route initiation frequency than the AODV protocol,and when the network topology changes rapidly,the AOMDV protocol has obvious advantages in packet delivery rate.3.An optimized protocol E-AOMDV for on-demand multi-path distance vector routing in wireless ad hoc network considering node energy is proposed.In view of the fact that AOMDV protocol does not consider the routing consumption caused by the energy of mobile nodes,a node energy model is added to the routing protocol to balance the energy consumption of each node in the network through an energy control strategy.Simulation results show that the end-to-end delay,network overhead,and route initiation frequency of E-AOMDV routing are significantly improved.