QoS-sensitive data transmission method and system based on dynamic cooperation

Abstract

The invention provides a QoS-sensitive data transmission method and system based on dynamic cooperation. The method includes the steps that firstly, a cognitive user sends a cooperation request to all master users in the transmission radius; secondly, the master users determine a cooperation scheme; thirdly, the cognitive user selects one master user according to the cooperation scheme; fourthly, in a time slot t, the selected master user broadcasts master user data to a cognitive relay, and meanwhile the cognitive user sends cognitive user data by using a master user frequency band; fifthly, in a time slot 1-t, the selected master user and the cognitive relay send the master user data to a master user receiver, and meanwhile the cognitive user sends the cognitive user data by using the master user frequency band; sixthly, allocation of bandwidths in the next time slot is decided according to the degree of satisfaction. According to the method, when the QoS of the cognitive user cannot be guaranteed, the cognitive user cooperates with the master users in a mutual selection mode, the QoS of the cognitive user is guaranteed, and the transmission quality of the master users is not influenced.

Description

technical field [0001] The present invention relates to a cooperative transmission method of cognitive radio, in particular to a QoS (Quality of Service, Quality of Service) sensitive data transmission method and system based on dynamic cooperation. Background technique [0002] Under the current spectrum management mechanism of wireless sensor networks, most of the spectrum resources are allocated to the primary user (PU, Primary User) through authorization. Since the licensed spectrum cannot be used by cognitive users (SU, Secondary User), Therefore, the available bandwidth resources of cognitive users cannot be guaranteed. Unlike the severe situation where unlicensed spectrum resources are increasingly scarce, there is a large surplus of licensed spectrum in practical applications. According to the survey report of the Federal Communications Committee (FCC, Federal Communication Committee), in New York, the actual utilization rate of the 30MHz-3GHz frequency band is only...

AI Technical Summary

Problems solved by technology

[0005] In the current technical background, in order to ensure the QoS of the primary user, the primary user usually selects the cognitive user for cooperation. The cognitive user improves the QoS of the primary user by consuming its own spectrum resources and power, but this method ignores the transmission quality

Most cognitive users also have QoS transmission requirements. When the lower limit of QoS cannot be met, the current mainstream solution is to find available nodes for cooperative transmission. However, when no available channels can be found within the transmission radius of cognitive nodes , the existing technical solutions are helpless

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