Wired and wireless hybrid Internet of Things system and clustering method

Abstract

The invention belongs to the technical field of wireless communication network, and discloses a wired and wireless hybrid Internet of Things system and a clustering method. The method comprises the steps of initializing a network, clustering terminal nodes, determining the size of a time block occupied by each cluster, determining the size of a tie slot, and updating data by the terminal nodes. The quantity of the conflicted terminal nodes is reduced by the way of distributing a period of specific time slot for each cluster, through clustering in combination with a network optimization methodaccording to the quantity of the terminal nodes in the network, the data sizes needing to be uploaded by the terminal nodes, and the condition of channels from the terminal nodes to a convergence node; the deficiency that the uploading rate of the terminal node in the network is affected due to the fact that a standard LoRaWAN protocol provided by a current LoRa alliance does not consider that thefrequent conflicts are caused by simultaneous uploading of the lots of terminal nodes is overcome, and the uploading rates from the terminal nodes to the convergence node in the wired and wireless hybrid Internet of Things are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication networks, and in particular relates to a wired and wireless hybrid networking system and a clustering method. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: Facing the rapid development needs of the Internet of Things, LPWAN (Low-Power Wide-AreaNetwork , Low Power Wide Area Network) is also rapidly emerging. NB-IoT and LoRa are typical representatives among them, and they are also the two most promising low-power wide-area network communication technologies. First of all, NB-IoT needs to work in the licensed frequency band. Under the premise of high frequency license cost, compared with LoRa, NB-IoT requires a higher cost, which is why NB-IoT is generally used by telecom operators. Compared with NB-IoT, LoRa IoT technology works on unlicensed spectrum. The LoRaWAN protocol standard developed by the LoRa Alliance, w...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the number of terminal nodes supported by the building operation data collection method does not exceed 100, and it cannot be applied to large-scale building operation data collection.

The disadvantage of this system is: the method of determining the interval time for sensor components to upload data to the LoRa gateway is not clear, so that when there are many sensor components in the system that want to upload data to the LoRa gateway, conflicts will occur, seriously affecting the upload rate

[0004] (1) The number of terminal nodes supported by the prior art one building operation data collection method does not exceed 100, which cannot be applied to large-scale building operation data collection

The reason why it is not applicable is simply to use the wireless LoRa method. Regardless of whether the terminal nodes upload data by dividing time slots or through competition, in order to ensure the upload rate of terminal nodes uploading data to the gateway, each gateway can only serve a certain number of terminal nodes.

Although it is an option to increase the gateway, the current market gateway price is high, which is not conducive to saving costs and cannot maintain market advantages

[0005] (2) Prior art 2 does not clarify the method for determining the interval time for sensor components to upload data to the LoRa gateway, so that when there are many sensor components to upload data to the LoRa gateway in the system, conflicts will occur, seriously affecting the upload rate

[0006] (3) In the large-scale Internet of Things network, the upload rate is low when the terminal node uploads data to the aggregation node

[0008] It is difficult to solve the above technical problems: Due to the limitation of the upload data rate of LoRa terminal nodes to the gateway, the number of terminal nodes that each gateway can serve will be very limited, which cannot adapt to a large number of LoRa terminal nodes in the large-scale Internet of Things to access the gateway requirements, and the upload rate of LoRa terminal nodes cannot be guaranteed

If LoRa terminal nodes upload data by completely dividing time slots, although no upload conflicts can be guaranteed, very strict time synchronization and timing strategies are required, which will be very difficult in large-scale Internet of Things, and may even be due to time synchronization. disorder, complete system paralysis

If all terminal nodes upload data to the sink node in a random manner, it will cause serious conflicts, which will also seriously affect the upload rate of terminal nodes

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