Over The Top live streaming of ultra-high definition television video – Proof of Concept 5
SPEED-5G project member Rohde & Schwarz has successfully tested Over The Top (OTT) live streaming of ultra-high definition television video (UHDTV) with the newest compression standard HEVC (High efficiency video coding) on the extended Dynamic Spectrum Access (eDSA) framework developed by the SPEED-5G project.
Because video streaming is seen as a main use case for future mobile networks, a video measurement system was designed to demonstrate the efficiency and usability of the developed eDSA test network.
The video quality measurements have verified the enhancements and demonstrated the quality of service (QoS) and the quality of experience (QoE) in the various conducted test scenarios.
In particular, these tests included:
- Load balancing on aggregated radio access technologies (LTE and WiFi)
- Channel switching controlled by hierarchical radio resource management (RRM)
These tests run on a setup outlined in the picture above. The video server provided the video content in the required data rate and the video client, including the monitoring function, consumes the video continuously. Video interruptions or interfered pictures, transmitted through the developed eDSA test network, – if any – are logged and the log gives evidence of the achieved performance.
Preparatory work to these tests was the development of an OTT live streaming server for UHD (4k) video with H.265 (HEVC) compression supporting the new Common Media Application Format (CMAF) and the Dynamic Adaptive Streaming over HTTP (DASH) combined to the classic broadcast signal with the Transport Stream over Internet Protocol (TSoverIP). For the receiving side, a video client was developed to receive the broadcast signal and to pull the video content from the streaming server in the use case of OTT live streaming. For the received video a HEVC decoder was integrated and adapted to the modified picture analysis and monitoring module. With these added functions, continuous monitoring and QoS/QoE determination is possible. Due to the generally modular software based design of both base instruments with their powerful processing capability, both systems could be easily enhanced with the new functions and requirements.
Such a system is useful to evaluate the usability and key performance indicators of a test network, because it is able to adapt to the actual conditions and it is working independently. This means that the test setup enables to measure without any external interference from the internet, providing reliable results.