基于缓存数据的LTE-A中继系统自适应下行调度算法

doi:10.3969/j.issn.1000-3428.2016.09.008

摘要/Abstract

摘要：

对于LTE-A中继下行链路,现有调度算法只进行优先级排序,不能根据系统需求自适应调节。为此,基于缓存数据提出一种LTE-A中继系统自适应下行调度算法。在修正的最大加权时延优先算法基础上,对其瞬时速率分式进行调整。以原算法的瞬时速率分式为底,添加对系统缓存数据量进行量化后得到的指数因子,使瞬时速率分式的权重跟随缓存区数据量变化,从而实现算法根据系统吞吐量需求的自适应调节。仿真结果表明,该算法在业务时延、频谱效率和公平性方面表现良好,可提高系统吞吐量、降低丢包率。

关键词: 自适应, 缓存数据, 修正的最大加权时延优先算法, 调度, 权重

Abstract:

This paper proposes an adaptive downlink scheduling algorithm for LTE-Advanced(LTE-A) relay downlink based on the buffer data,aiming at the problem that existing scheduling algorithms just simply perform priority ranking and cannot adaptively adjust according to the requirements of system.This algorithm adjusts its instantaneous rate fraction on the basis of the Modified Largest Weighted Delay First(M-LWDF) algorithm.In order to make the weight of instantaneous rate parameter follow the buffer data of change and the algorithm adaptive adjust according to the requirements of system,the algorithm increases the index factor acquired by the quantization of buffer data on the basis of the original instantaneous rate fraction.Simulation results show that the proposed algorithm can improve the performance of service delay,spectrum effectiveness and fairness.It can also improve system throughput and reduce the packet loss rate.

Key words: adaptive, buffer data, Modified Largest Weighted Delay First(M-LWDF) algorithm, scheduling, weight

中图分类号:

TN929.5

孙发帅,金杰,苏寒松,刘高华. 基于缓存数据的LTE-A中继系统自适应下行调度算法[J]. 计算机工程, doi: 10.3969/j.issn.1000-3428.2016.09.008.

SUN Fashuai,JIN Jie,SU Hansong,LIU Gaohua. Adaptive Downlink Scheduling Algorithm Based on Buffer Data for LTE-A Relay System[J]. Computer Engineering, doi: 10.3969/j.issn.1000-3428.2016.09.008.

http://www.ecice06.com/CN/Y2016/V42/I9/43

参考文献

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