Preliminary assessment on the performance of long distance wireless data transmission for disaster early warning system

The coverage of network infrastructure in the form of transmitters in Indonesia is not evenly distributed and has not yet reached remote areas. This creates difficulties in the implementation of Early Warning System (EWS) since data transmission between sensors and control center is required. A proper communication system is also needed to broadcast news to communities in the disaster prone regions. A practical solution to this is to use WiFI, which can also be utilized as a repeater to an internet access network. This study analyses the performance of the remote network that will be employed to transmit data from sensors to control centers and, finally, to the affected communities. Since WiFi uses CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance), its ability to transfer data will decrease when accessed by multiple users. In this study, the process of sending data from the client to server is performed at a distance of 30 km and is carried out every second for 24 hours. Data acquisition is done when there is a decrease in work units due to an increase in the number of users. After performing this long distance data transmissions, we can conclude that there are indeed busy hours in the afternoons and 'low net usage' hours during the early mornings.