Future Mobile Communications
Future Mobile Communications
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未来移动通信
DOI：
10.1007/978-3-658-00808-6
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发表时间：
2012
影响因子：
10.4
通讯作者：
Y. Zaki
中科院分区：
文献类型：
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作者：
Y. Zaki
在以成本有效的方式优化LTE网络的同时提供QoS是非常具有挑战性的。因此，无线电调度是移动的宽带网络中最重要的功能之一。移动的网络无线调度器的设计需要满足几个目标，例如：调度器需要通过有效地分配有限的无线资源来最大化无线性能，因为运营商的收入依赖于它;此外，调度器必须保证用户在服务质量（QoS）方面的需求。因此，设计一个有效的调度程序是一项相当复杂的任务。在这篇论文中，作者提出了一个无线电调度器的设计，优化QoS保证和系统性能优化。提出的调度器被称为“优化服务感知调度器”（OSA）。OSA调度器在几种情况下进行了测试和分析，并与其他已知的调度器进行了比较。本文还提出了一种新的无线网络虚拟化框架。该框架针对在3GPP长期演进（LTE）系统内应用的无线虚拟化的概念。LTE代表了刚刚进入市场的新的移动的通信系统之一。因此，LTE被选为案例研究，以证明所提出的无线虚拟化框架。该框架在LTE网络模拟器中实现并进行了分析，突出了虚拟化过程可以实现的许多优势和潜在收益。分析了在LTE系统中使用网络虚拟化可能产生的两种潜在增益场景：来自频谱共享的复用增益和多用户分集增益。本文设计并开发了几种基于连续时间马尔可夫链的LTE无线电分析模型。这些模型针对三种不同时域无线电收发器的建模：最大吞吐量（MaxT）、盲等吞吐量（BET）和优化服务感知吞吐量（OSA）。模型用于获得更快的结果（即，在非常短的时间段内，大约几秒到几分钟），相比之下，模拟结果可能需要相当长的时间段，例如几小时或者有时甚至几天。模型结果也与仿真结果进行了比较，结果表明，它提供了一个很好的匹配。因此，它可以用于快速无线电尺寸的目的。
Providing QoS while optimizing the LTE network in a cost efficient manner is very challenging. Thus, radio scheduling is one of the most important functions in mobile broadband networks. The design of a mobile network radio scheduler holds several objectives that need to be satisfied, for example: the scheduler needs to maximize the radio performance by efficiently distributing the limited radio resources, since the operator’s revenue depends on it. In addition, the scheduler has to guarantee the user’s demands in terms of their Quality of Service (QoS). Thus, the design of an effective scheduler is rather a complex task. In this thesis, the author proposes the design of a radio scheduler that is optimized towards QoS guarantees and system performance optimization. The proposed scheduler is called “Optimized Service Aware Scheduler” (OSA). The OSA scheduler is tested and analyzed in several scenarios, and is compared against other known schedulers. A novel wireless network virtualization framework is also proposed in this thesis. The framework targets the concepts of wireless virtualization applied within the 3GPP Long Term Evolution (LTE) system. LTE represents one of the new mobile communication systems that is just entering the market. Therefore, LTE was chosen as a case study to demonstrate the proposed wireless virtualization framework. The framework is implemented in the LTE network simulator and analyzed, highlighting the many advantages and potential gain that the virtualization process can achieve. Two potential gain scenarios that can result from using network virtualization in LTE systems are analyzed: Multiplexing gain coming from spectrum sharing, and multi-user diversity gain. Several LTE radio analytical models, based on Continuous Time Markov Chains are designed and developed in this thesis. These models target the modeling of three different time domain radio schedulers: Maximum Throughput (MaxT), Blind Equal Throughput (BET), and Optimized Service Aware Scheduler (OSA). The models are used to obtain faster results (i.e., in a very short time period in the order of seconds to minutes), compared to the simulation results that can take considerably longer periods, such as hours or sometimes even days. The model results are also compared against the simulation results, and it is shown that it provides a good match. Thus, it can be used for fast radio dimensioning purposes.