During emergencies or natural disasters, communications can be interrupted, hindering the discovery process
Traditional solutions to this problem already utilize satellite communications and infrastructure. The equipment needed to gain access to satellite communications can be cumbersome.
To address this the paper proposes an integrated satellite-to-ground emergency network. The access points to this network would include ground access points and easy to use portable satellite stations.
The aim of the project is to set up a stable emergency communication network within thirty minutes and support audio, video communication, file transmission, etc.
Geological disasters disrupt ground based communications systems. Destroying infrastructure and adding to confusion when processes rely on ground only communications.
Existing mobile networks can be overloaded by large numbers of people trying to use mobile networks at the same time.
Due to the limited time to save lives, any delay caused by communications will cost lives. Because of this we need a stable portable and easy to use emergency network reconstruction system.
Traditional satellite communications systems rely on singular satellites or a singular portable station. The Limited mobility of the satellite means it can't react to any unforeseen disaster in any part of the world.
The article proposes using ground mesh network to construct a local area network covering the disaster area, the SPS is used to connect the local area network to the external public network. The ground node equipment is designed to access both wired and wireless access functions and can be carried by an individual.
The article suggests the ideal network model is a Mesh network, mainly constructed by several network node devices.
The nodes can be placed in a fixed position or in a mobile state; the topology of them will change as the nodes move.
In terms of user access, in order to improve network performance, the ground Mesh network provides 2.4G band Wi-Fi access function and wired access function.
The second part of the article focuses on the relevant research on how to build this post disaster emergency communication network. They gave a review of the use of Drones, balloons and cloud computing as previously studied.
I won't go into the non-communication satellites solutions, but the main drawbacks is the integrated satellite-ground emergency constructed-network. The third part of the article focuses on the ISG ENC model
To ensure the stability of the network in ISG-ECN, an improved OLSR (Optimized Link State Routing) protocol based on energy perception and multi-constrained Quality of Service is used in the network routing layer to reduce the impact of mobile nodes on network performance.
Fixed network nodes usually need to be deployed in higher terrain. Mesh network nodes can also be deployed in a mobile manner; the weight of the MESH node equipment involved in this article is 1.45 Kg. They can be attached to local power systems to increase longevity. Point to point communications can range from 3.5KM and bandwidth between Mesh network nodes in our network can reach 20Mbps.
In the traditional method, the local area network generally establishes a connection with the public network through network equipment such as routers or switches in this case the satellite network acts as a relay between the Mesh network and the public network
The weight of the portable satellite station in this solution is 19 Kg. The equipment can be deployed and debugged within 30 min.
The ground Mesh network node provides user access functions which support wired and wireless access of multi-user terminals, while the satellite network is used to connect the Mesh network to the public network.
The actual deployment test results show that the emergency communication network in the article can achieve a higher data transmission bandwidth, and can achieve rapid deployment in a shorter time.
https://doi.org/10.1016/j.nhres.2020.12.002
Jianguo Zhou Changjia Zhou Yuqin Kang Shenghui Tu
School of Electronic Information, Wuhan University, Wuhan, 430072, China
Integrated satellite-ground post-disaster emergency communication networking technology