# An Overview of Emergency Communication Networks
## 5 Sea Ad Hoc Network (SANET)
### Summary of Network Development Status
#### 3.2.4 5G Networks  
5G network technology [117] includes network slicing technology, ultra-dense heterogeneous network technology, and multi-access edge computing technology. In emergency rescue work, the network slicing technology can be used to realize the interconnection of various devices, thus comprehensively improving the efficiency of emergency rescue command and promoting the development of rescue work [118]. With the support of 5G network technology, all regions need to speed up the construction of emergency rescue communication equipment, especially that used for the network control center, satellite ground station, and converged communication platform. At the same time, it is also necessary to use emergency communication equipment to expand network coverage and promote the development of emergency rescue work. [PERSON] et al. [119] discussed the application prospect of 5G technology in coal mine intellectualization and analyzed the feasibility and necessity of intelligent application of 5G in a coal mine. [PERSON] et al. [118] studied the composition and networking mode of a 5G wireless communication system for mining, and proposed the application scenario of 5G technology in coal mines. [PERSON] et al. [120] studied a new super-intensive networking technology for emergency communication based on the 5G network as the traditional networking technology, and using data positioning technology to control network data so as to reduce the distance of the base station in the process of network construction. In view of the current 4G situation of \"one network and one station\" in coal mines, [PERSON] [121] proposed the network architecture of 4G and 5G integration in coal mines based on NSA. The network not only has the functions of continuous 4G base station coverage and wireless high-speed transmission across the whole mine, but also makes full use of the advantages of the 5G network to realize the intelligent application of 5G in underground coal mines and promote the construction of intelligent mines. [PERSON] et al. [122] proposed an action plan for search and rescue using a multi-rotor UAV under a 5G communication network based on the sea surface coverage model of the 5G network. The efficiency of maritime search and rescue was greatly improved using a network communication model and a UAV-related load. [PERSON]. [PERSON]. [123] designed an efficient C-V2X network with 5G communication. In recent years, ZTE has also made significant progress in the research and development of ultra-high-definition network cameras for the search and rescue of lost people, 5G video conferencing terminals, and 5G integrated command platforms. In Europe, the European Commission and the European ICT industry are currently fostering 5G research and innovation across different vertical integrations through their joint 5G infrastructure. In view of the problems faced by existing emergency communication systems, such as low rate, high delay, insufficient bandwidth, and poor interoperability, [PERSON] et al. [124] proposed a technical route of integrating a 5G and UAV emergency communication system. [PERSON] et al. [125] proposed a technical route of integrating a 5G mobile communication network and a satellite communication network. In the future, the coverage of communication networks will not be limited by the surface, and the world will enter a new era of broadband Internet. SANSA proposed dynamic spectrum sharing and ground ad hoc network research for satellite and 5G network fusion. The SATis5 project was proposed in March 2017 and launched in August 2018, and is a platform designed to demonstrate, evaluate, and verify 5G + integrated satellite communication networks. In 2020, VestaSpace, an Indian company, released a satellite constellation with 5G network and IoT functions.