Comparative analysis of file transfer protocols in low-bandwidth radionetworks

Abstract

The use of modern digital ultra and very high frequency (UHF/VHF) radio stations in the construction of digital governmental automated control systems (ACS) of the low echelon management level has led to the creation of protocols and standards that allow data transmission in low-bandwidth communication networks. However, none of these standards provide recommendations for file transfer in communication networks facing low speed, long delay and high probability of data loss. This work investigates QoS parameters and performs comparative analysis of FTP, TFTP, SCP, SFTP, ETFTP protocols for file transfer in low-bandwidth communication networks based on UHF/VHF radio stations. A model of two Harris RF-7850M-HH radio stations connected by an attenuator and coaxial cables was used to measure the QoS parameters. The characteristics including the bandwidth, jitter and average time of data transmission depending on the operating modes of radio stations and the level of attenuation in the radio communication channel have been obtained. The time of file transfer and the actual size of the transmitted data when using these protocols was measured. The recommendations for use of file transfer protocols in radio communication channels depending on the operating mode of the radio station are given. The obtained results allow to rationally choosing the mechanism and algorithm of file transfer when building governmental ACS of the low echelon management level based on low-bandwidth communication networks to increase the efficiency of bandwidth use in radio networks.