Multipath Based Adaptive Concurrent Transfer for Real-Time Video Streaming Over 5G Multi-RAT Systems

5G systems use multiple radio access technology (multi-RAT) to provide broadband, low latency, and high reliability services. Multi-RAT is effective when multipath transmission is used over multichannels. This is why multipath based transmission is one of the key technologies that can improve the throughput and reliability of real-time video streaming over 5G networks. This paper proposes two multipath based concurrent transfer techniques; fast concurrent transfer (FCT) and reliable concurrent transfer (RCT). FCT aims to minimize the round trip time (RTT) required for frame transmission by arranging each of the packets constituting a frame to be sent over multiple channels. In an environment where there are multiple channels, RCT performs redundant transmission of packets, so that even if a packet is lost in one path, the lost packet can be received safely over another path. FCT aims at securing the reliability of data transmission. In addition, a multipath based adaptive concurrent transmission (MACT) scheme is proposed which controls the ratio of FCT and RCT adaptively considering the state of the receiver buffer, inflow throughput, and decoding rate to enhance the reliability and throughput performance. The simulation results show that the proposed MACT scheme results in a better performance compared to the conventional transmission schemes in various network channel conditions.