Scheduling method for ensuring service quality of real time operation in OFDM

Abstract

The invention includes two steps. In preparing step, the dispatching cycle is fixed. One time of dispatch is carried out for minimal unit of one dispatching resource of sub band composed of the several adjacent sub carrier waves of multiple service queues within a time slot. The method of closed loop feedback is utilized in the system. Based on average S / N ratio of each sub band, the mobile station feeds back the word of data rate control (DRC) obtained by looking up the table. In dispatching step, the method dispatches services considering channel conditions and the requirement of service time delay comprehensively according to the service priority from high to low in turn. In determining the interval of dispatching target value, the limitation of maximum number of sub band is considered by using priorities, and the dispatch is carried out based on sub bands with largest DRC. The invention features the good efficiency, delay performance and fairness.

Description

technical field [0001] The scheduling method for guaranteeing the quality of service of real-time services under OFDM belongs to the resource scheduling technology in the field of wireless communication. Background technique [0002] The development of the Internet and the increase in the public's demand for wireless multimedia services require that the wireless communication system be able to transmit data flexibly and at high speed, and guarantee the service quality requirements (QoS: Quality-of-Service) of various types of services. [0003] The so-called quality of service, from the user's point of view, is the user's satisfaction with the services provided by the network. From the perspective of user services, it can be described as parameters such as bandwidth, time delay, and loss rate provided by the network to services. In a communication network, services can be divided into QoS services and Best-effort services. The best-effort service refers to the service that...

AI Technical Summary

Problems solved by technology

Therefore, first, it cannot reflect the different transmission capabilities of each subcarrier, and cannot obtain user diversity gain on frequency, thereby reducing system efficiency

Second, the OFDM system can transmit data of multiple users at the same time, and there is a multi-server scheduling problem

However, the characteristics of future services will be more flexible and complex, which may lead to different specific QOS indicators corresponding to each label in the queue

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