具有时延QoS约束的OFDMA系统比例公平调度分析

S. Ahn, Seokwon Lee, Kyungho Kim, D. Hong
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引用次数: 2

摘要

提出了用户复用条件下OFDMA系统比例公平调度的吞吐量-延迟权衡分析模型。为此,我们提出了基于二维频域和时域资源划分的简单有效的资源分配方案。基本上,频域划分是由频率分集度决定的,而时域划分是由复用度决定的,复用度是指在一个帧的子信道中要服务的用户数量。我们的方法旨在通过为给定的频率分集程度选择适当的多路复用程度来最大化延迟约束的吞吐量。通过分析OFDMA系统的有效容量,研究了复用度和频率分集对延迟QoS性能的影响,并提出了一种用渐近逼近法求最优复用度的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of proportional fair scheduling in OFDMA systems with delay QoS constraints
We present an analytical model of throughput-delay tradeoff of the proportional fair scheduling of OFDMA Systems in context of user multiplexing. For this purpose, we propose simple and efficient resource allocation schemes which are based on 2-dimensional resource partitioning in frequency and time domain. Basically, frequency-domain partitioning is determined by degree of frequency diversity and time-domain partitioning is determined by degree of multiplexing which is number of users to be served in a sub-channel of a frame. Our approach is aimed at maximizing the delay constrained throughput by choosing the appropriate degree of multiplexing for a given degree of frequency diversity. We investigate the effect of degree-of-multiplexing and frequency diversity on delay QoS performance of OFDMA system by analyzing the effective capacity, and then develop an approach to finding the optimal degree of multiplexing by the asymptotic approximation.
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