Video multicast transmission method based on TV white frequency band

Abstract

The invention discloses a video multicast transmission method based on a TV white frequency band. The video multicast transmission method comprises the five steps: building a wireless video multicasttransmission network, performing SVC encoding processing on the video by a CR base station, performing spectrum detection and realizing the optimal resource scheduling. The utilization rate of the TVwhite frequency band is improved by using the cognitive radio technology. The SVC technology is applied to encode the video so that the user can obtain the video matching the channel quality. The AMCchannel encoding technology and the video encoding SVC technology are matched in the physical layer to ensure the link quality. The heuristic algorithm of the binary particle swarm optimization algorithm with low complexity is applied to obtain the sub-optimal solution of the optimal resource scheduling and solve the resource scheduling problem based on the maximum proportional fairness as the resource scheduling criterion. The method improves the throughput of the system and the quality of the received video and realizes the purpose of receiving the matching high-quality video according to the user channel quality.

Description

technical field [0001] The invention relates to the technical field of wireless communication technology, in particular to a video multicast transmission method based on TV white frequency band. Background technique [0002] In recent years, with the gradual popularization of portable intelligent terminals such as smartphones and tablet computers, people’s ways of watching videos are not limited to computers and TVs. With the full coverage application of 4G network, mobile video data traffic will occupy a larger proportion in all mobile data traffic. [0003] The development of wireless video services requires a huge amount of bandwidth support. The current spectrum resources are seriously lacking. A large part of the reason comes from the growing mobile multimedia applications. The further popularization of smart electronic products will definitely have a negative impact on the current mobile communication network that is on the verge of collapse. Bigger shock. [0004] I...

AI Technical Summary

Problems solved by technology

[0005] The video unicast transmission method allocates a separate channel resource for each user to transmit video data, consuming a large amount of broadband resources

Therefore, multicast is used to solve the above problems. Wireless video multicast first needs source coding to reduce the amount of data to be transmitted. With the rapid development of video coding technology, H.264 / MPEG-4AVC can provide a good Compression ratio, but the application of these technologies makes video a very demanding application, which is very sensitive to errors such as packet loss and bit errors. The current video coding cannot be directly used for wireless video transmission, because the output of this coding scheme is fixed. In wireless video transmission, the user’s channel quality is different, and the encoding method of fixed bit rate can only choose the bit rate that the user can bear in order to take care of the user with poor channel quality. This method is good for channel quality The current wireless video technology is supported by application layer video coding and physical channel coding, and under the guidance of the protocol layered design idea, the two layers of technology are independently researched and designed. , which also leads to the lack of robustness and scalability of wireless video transmission

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