Transmission performance of 4K high resolution real-time video streaming signal for a local 5G uplink
Hideaki Matsue, Takamasa Nishizima, Hiroki Urasawa, Ryota Bairaku, Hayato Soya, Kazihiro Mamaguchi · 2023
For a local 5G uplink, we newly created an environment in which packet errors can be stably and deliberately controlled by adding a load to the transmission path, and conducted 4K high resolution video transmission experiments. When there is no load and the decoder cache time is 0 ms, the Round Trip Time (RTT) for both Real-time Transport Protocol (RTP) and Secure Reliable Transport (SRT) were approximately 40-90 ms larger when using a local 5G transmission path than when using Ethernet. In addition, when there was no load and the decoder cache time increased from 0 to 300 ms, the RTT did not increase by the same amount, but only by approximately 150-200 ms for RTP and 210-220 ms for SRT. When the decoder cache time increased from 0 to 300 ms under overload conditions, the RTT increased by approximately 100-140 ms for RTP and by approximately 200-330 ms for SRT, showing that the increase for SRT can be larger than the cache time increase. In addition, examining the video transmission speed and frame transmission speed in the decoding output and performing a subjective evaluation of video quality, indicated no difference between the two protocols under no load and no overload conditions, indicating that RTP is superior to SRT from the viewpoint of RTT. However, it was revealed that SRT is a better video transmission protocol than RTP in terms of continuation of video playback, although a constant value of RTT is required under overload.