Page 112 - Kaleidoscope Academic Conference Proceedings 2022

2022 ITU Kaleidoscope Academic Conference

to achieve the effect of equalized traffic distribution. For cause a continuous timing collision and will not disappear
each device's video stream, the full-speed transmission of the automatically.
network will not introduce additional delay, which can
effectively improve real-time video transmission efficiency Based on two front-end video devices testing data, the
of 5G networks. network data transmission situation when I-frames collide is
shown in Figure 2.
However, the current 5G technical standards mainly focus on
5G network capabilities, and there is a lack of technical
standards that integrate with industry business characteristics
such as video surveillance. To better promote 5G in industry
services, it is necessary to deeply study the integration of 5G
networks and industry services. The development of
standardized technologies combined with business
characteristics to achieve 5G networks truly lands in industry
applications, and network peak control technology for
concurrent transmission of multichannel videos under 5G Figure 2 – I-frame collision of two front-end video
networks is an important one. devices causes the burst of network transmission data to
increase
2. DISCUSSION
Through the random experiment of 7-channel video
2.1 Network peaks generation analysis in single- concurrent transmission, 7-channel cameras are randomly
channel video transmission scenario pulled (I/P frame size ratio is 10:1), 125 operations are
recorded, and the probability of collision of 2/3/4/5/6/7
According to the transmission characteristics of single- channels is generated is shown in Table 1.
channel video, through the analysis of video transmission
technology, it can be found that in real-time video Table 1 – Probability of I-frame collision when 7 devices
monitoring transmission, there is a situation of regularly are concurrently uplinked
sending I-frames (key frames), and the traffic when sending
I-frames will be ordinary P frames [7-9] . Total
Number of Occurrence number of Collision
According to the video surveillance service test, data collision paths detections probability
analysis results show: taking Frames Per Second (FPS) equal None 10 125 8%
to 25 as an example, a video frame is generated every 40ms,
and an I-frame is generated every 2 seconds. The difference 2 35 125 28%
between I-frame and the P frame is large, and the data 3 25 125 20%
volume ratio can reach more than 10 times. The network 4 25 125 20%
transmission data is shown in Figure 1. 5 20 125 16%
6 8 125 6.4%
7 2 125 1.6%

When seven channels of video are transmitted concurrently,
the collision probability of I-frame is about 92%. The larger
I/P frame ratio, the more Internet protocol Cameras (IPCs)
colliding at the same time, resulting in larger data peaks.
With the common 5G base station capability of 150M uplink
bandwidth, the theoretical number of video transmission
Figure 1 – Network transmission characteristics of real- paths (calculated according to the 4M code stream of 1080P)
time streaming video frames is about 36 channels, which is far more than seven channels
concurrently, and the probability of its I-frame collision will
2.2 Network peaks generation analysis in also be greater.
multichannel video concurrent transmission
scenario It is precisely because of the collision of I-frames when
multiple video channels are concurrently transmitted that the
According to the situation of single-channel video peak value of the 5G network fluctuates greatly, and the
transmission, it can be inferred that when multiple channels bandwidth resource requirements of the 5G base station are
of video are transmitted concurrently, I-frames may be sent higher. Under the limited bandwidth, it may even cause
at the same time (I-frame collision), causing severe video freezes, hindering the scale of 5G video surveillance
fluctuations in network peaks. Since the I-frame sending applications.
timing configurations of cameras in the same area are
generally the same, when an I-frame collision occurs, it will

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