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

A real-time service and quality of service technology, applied in FM carrier system, multiplexing communication, communication between multiple stations, etc. It can solve the problems of different QOS indicators, inability to obtain user diversity gain, and reducing system efficiency.

Inactive Publication Date: 2003-12-24
TSINGHUA UNIV
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  • Claims
  • Application Information

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 user

Method used

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

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Embodiment Construction

[0039] Figure 2 gives A system block diagram of the scheduling algorithm is shown, and the system sets up tag queues for real-time services. At each initialization of scheduling, a tag is created in the corresponding business queue for newly arrived data. The DRA creates and maintains a tag queue for each real-time service allowed to access, and records the average transmission rate variable R within a period of time. Each data packet in the data pool corresponds to a label, which records the ID of the corresponding data packet and the data length Len i,j , the remaining delay Delay i,j And according to the importance of the package, the priority evaluation value β obtained by delay jitter and error requirements i,j . This information is updated each time a schedule is completed or new data is generated.

[0040] A mobile station can flexibly establish one or more service queues. After the CAC algorithm allows the access of a service, a separate service queue can be est...

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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 consideredby 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...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04J11/00H04L12/24H04L27/10H04L27/26H04W72/04
Inventor 周世东肖亮姚彦肖立民粟欣
Owner TSINGHUA UNIV
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