Internet-of-Things communication system and construction method thereof

Abstract

The invention relates to the field of Internet of Things, and provides an Internet-of-Things communication system and a construction method thereof. The Internet-of-Things communication system comprises a first-layer network and a second-layer network, wherein the first-layer network is a multi-hop network which is constructed by a central gateway and a cluster head node and takes the central gateway as a root node; the second-layer network is a point-to-multipoint single-hop cellular network constructed by the cluster head node and the terminal node; and the cluster head node is generated byelecting from the terminal node according to a preset rule and is used for converging and forwarding data sent by the terminal node. In the networking initialization process of the terminal nodes, thecluster head node is elected according to the preset rule, it is guaranteed that the number of multi-hop levels from the center gateway of the first-layer network to the cluster head node is as smallas possible, the end-to-end time delay is reduced, and the throughput and the network transmission efficiency of the network are improved. The second-layer network is a point-to-multipoint single-hopcellular network, so that the communication requirement of low time delay during high-frequency concurrent data transmission of a large number of terminal nodes can be met.

Description

technical field [0001] The present invention relates to the field of the Internet of Things, in particular to an Internet of Things communication system and a construction method of the Internet of Things communication system. Background technique [0002] With the development of the Internet of Things, the demand for wireless Internet of Things communication is getting wider and wider. The current low-power wide-area network (LPWAN) networking structure is mainly a point-to-multipoint single-hop star network. The central node (gateway) performs wireless resource reception and scheduling for terminal nodes, which is not conducive to large-scale networking. When there are a large number of It is difficult to meet the high-frequency and low-latency communication requirements when the Internet of Things nodes are connected. For example, the networking structure of a personal area network (PAN) using Zigbee technology is mainly a tree network or mesh network with multi-hop char...

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Problems solved by technology

For another example, using the networking structure of LoRa Internet of Things technology, the LoRa gateway adopts frequency division multiple access mode (code division multiple access is not supported), and when multiple end users transmit data concurrently, the efficiency is low; moreover, the LoRa terminal adopts carrier detection The MAC layer access mechanism of listening to conflict detection can meet the low-frequency data transmission requirements of end users, but the time delay is large when end users upload data frequently, and the network transmission efficiency is greatly reduced

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