Multimedia communication cooperative multicast transmission method in cognitive radio network

Abstract

The present invention discloses a multimedia communication cooperative multicast transmission method in a cognitive radio network. The method comprises a first step that a main network sends parameter information to a cognitive relay; a second step that a maximum data bit amount of users in a multicast group is calculated; a third step that the main network determines whether the bit amount of a basic layer meets requirements, if not, a fourth step is carried out, if yes, a fifth step is carried out; the fourth step that the main network combines a cooperative transmission time proportion and a cooperative power that are determined finally, a main user uses a front alpha i part to transmit basic layer data, and a cognitive user uses the left (1-alpha i) part to transmit its own information; the fifth step that the main user uses a front alpha j part to transmit basic layer data, and the cognitive user uses left (1-alpha j) part to transmit its own information; and a sixth step that whether the frame is finished is determined, if not, the second step is carried out, if yes, transmission of the frame data is finished. Through adoption of the method, the system throughput of the main network can be improved effectively, the cognitive network transmission opportunities are increased, the transmission reliability and stability are high, and the method can be applied to 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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