Relay selection method giving consideration to channel conditions and traffic states in cooperative communication system

Abstract

A relay selection method giving consideration to channel conditions and traffic states in multi-user cooperative communication is characterized by introducing a traffic arrival model which can embody traffic burstiness and self-similar characteristic to each user of the network, then comprehensively considering the different QoS requirements of each user traffic, and selecting the direct transmission mode when the channel conditions meet the threshold of signal to noise ratio corresponding to the minimal transmission rate requirement according to the current real-time channel condition and the traffic state; and based on the principles of proportional fairness and user satisfaction, selecting a cooperative partner as the relay user to participate in cooperative transmission when the channel conditions are less than the threshold of signal to noise ratio corresponding to the minimal transmission rate requirement and the cache region at the relay end is not full according to the multi-optimization objective of relay selection, so as to reduce the outage probability of the source user and the influence on the traffic transmission of the relay user, improve the traffic transmission performance of the source user, minimize the influence on the traffic transmission performance of the cooperative user, ensure the different QoS requirements of the user traffics and improve the communication reliability of the cooperative relay system.

Description

technical field [0001] The present invention relates to a new wireless relay selection method, to be more precise, relates to a multi-user cooperative communication network in which multiple services have different service quality requirements, and a relay selection method that takes into account channel conditions and service states, and belongs to The technical field of wireless communication. Background technique [0002] Since the future communication system uses a variety of advanced technologies, the system has very powerful functions to support more complex service transmission platforms. Therefore, supporting multi-service or mixed services will become the main function of the future communication system. After breaking through and overcoming the technical difficulties of specific realization, the practicability of the future communication system will largely depend on the needs of user services in the network. Therefore, in order to meet the needs of users, scienti...

AI Technical Summary

Problems solved by technology

In a wireless relay network, the above factors are not the only factors that affect node selection, but also factors such as the service arrival time of each user and the buffer space capacity. If only the above factors are considered, it will bring many problems and eventually affect to the improvement of overall system performance and user satisfaction

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