Cooperative Multicast Transmission Method for Multimedia Communication in Cognitive Radio Networks

Abstract

The invention discloses a cooperative multicast transmission method for multimedia communication in a cognitive radio network, the steps of which are as follows: S1 the main network sends parameter information to the cognitive relay; S2 calculates the maximum data bit amount of the multicast group user for partial transmission Self information; S6 judges whether the frame is over, if not, go to S2, otherwise, the data transmission of the frame is over. The invention can effectively improve the system throughput of the main network, increase the transmission opportunity of the cognitive network, has high transmission reliability and strong stability, and can be used in a cognitive radio multimedia cooperative multicast system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a cooperative multicast transmission method for multimedia communication in a cognitive radio network. Background technique [0002] Due to the rapid development of wireless communication technology and various terminal applications, people's demand for wireless spectrum has increased significantly. Under the ever-increasing social demand, people need to centrally present services such as text, graphics, images, audio and video on terminals. In the foreseeable future, people's demand for wireless spectrum will be concentrated in multimedia applications such as video websites, peer-to-peer multimedia networks, and distributed games. However, spectrum resources are very limited and precious resources. Due to the fixed allocation mechanism of existing spectrum management, with the rapid development of various communication services, wireless spectrum has become a scarce resour...

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is that when transmitting multimedia data, the method uses the direct multicast method of the base station. Although the method uses scalable video coding to ensure that the decoded video quality of users with good channel conditions is high, but due to Channel fading and path loss. When the number of users in a multicast group increases, in order to ensure that all users can correctly decode the video data, the transmission rate will inevitably decrease, which limits the system throughput of the entire network.

The shortcomings of this technical solution are as follows: firstly, this method adopts cooperation between users to realize the effective transmission of multicast data, and assumes that users are selfless as relays, but this assumption is unreliable, because users are all selfish and only consider own interests; secondly, this method is not suitable for cognitive radio networks, and cannot fully mobilize the enthusiasm of both primary and secondary users, and the incentive effect is not significant

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