700MHz is known as the golden band, with wide coverage and strong diffraction ability, which is very suitable for deployment in vast rural and remote areas, and can greatly reduce the construction cost; With the proposal of the national "double carbon" goal, as an important field to achieve the "double carbon" goal, the State Grid of China has put forward new requirements for the construction of new power systems; The digitalization and intellectualization of the power industry put forward higher requirements for the delay, bandwidth and reliability of the communication system; The features of 5G technology, such as low latency, high reliability and Dalian connection, just meet the requirements of the above features; At present, the deployment planning of 700MHz network is still in the exploration stage. This paper combines the actual deployment and test of power 5G service, and provides a reference basis for a large number of deployment of 700MHz band terminals and base stations in the power system through the actual test data.
In the Internet of Things (IoT) environment, embedded IoT devices have limited computing and storage resources. Their data lacks encryption protection. To solve this problem, this paper proposes a lightweight encryption algorithm based on SM4. First, this paper analyzed the encryption and decryption principle of SM4 algorithm. Then the S-box used in the encryption and decryption process was extended from high-order domain to low-order domain. The S-box component is constructed by a few logic gates to realize the lightness of the algorithm. Finally, the optimized SM4 module was embedded in the 5G communication terminal for testing. The results show that the lightweight encryption algorithm for IoT device can adapt to the data encryption of resource-constrained devices well. It is helpful to avoid the data leakage.
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