Design And Implementtation Of Integrated Access Gateway Based On Internet Of Things

With the rapid development of the Internet of Things and the rapid advancement of science and technology,various devices have the demand of accessing the network.Before the advent of low-power wide area network technology,IoT devices are in a well-established LAN range,Through the local area network Zigbee,Bluetooth or wifi access to the gateway,and then through the gateway access to the 4G network,to achieve long-distance communications,but such communications network there are complex transmission process,the Network transmission rate is relative low,the transmission distance short and other issues.With the emergence of low-power wide area networks,long-distance communications and low power consumption can be achieved at the same time,but also saves the cost of additional repeaters.As long as the IoT devices connect to the low-power WAN,they can connect directly to low Power WAN base station,the current low-power wide-area network long-range wireless communications solutions are LoRa,NB-IOT and eMTC and other.Today's IoT devices are all connected to the network through one of LoRa,NB-IOT,or eMTC protocols.An IoT device that does not support an NB-IoT device can choose to connect to a LoRa network base station via the LoRa protocol or access the eMTC protocol eMTC network base station.Such IoT devices have poor scalability and interoperability with different IoT transport protocols can be significantly hampered.To solve the above problems,we first studied the network access gateway that can support various Internet of things protocols,and designed an Internet of things integrated access gateway module which can support three network connections of NB-IOT,LoRa and eMTC protocol.Network devices with network requirements can be connected to one of the IOT network,LoRa network or eMTC network through this integrated gateway module.Based on the realization of a gateway that supports a variety of IoT protocols,this paper studies the problem of access selection of heterogeneous networks in IoT.In a heterogeneous wireless network environment,the existing network resources need to be reasonably utilized,and at the same time,Structure wireless network selection algorithm,the user can be based on the network environment and user needs of the network,select a reasonable network access.Through the research of the existing heterogeneous wireless network selection algorithm,a heterogeneous wireless network selection algorithm combining multiple AHP and TOPSIS by multiplicative weighted aggregation operator is proposed in this paper.Thus avoiding the problem that the AHP algorithm alone is too subjective and the TOPSIS algorithm is too objective.The algorithm can take into account the results of the selection of the two algorithms to get a more reasonable network selection structure.According to the simulation structure,it shows that using the algorithm proposed in this paper,in certain scenarios,the delay jitter of the selected network,as well as the data indicators such as network speed and price are optimized.