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宽带蜂窝网中基于认知无线电频谱使用优化的研究

作　者: 马胜利
导　师: 郭滨
学　校: 长春理工大学
专　业: 信息与通信工程
关键词: spectrum usage cognitive radio spectrum mobility femtocell
分类号: TN925
类　型: 硕士论文
年　份: 2013年
下　载: 1次
引　用: 0次
阅　读: 论文下载

内容摘要

The rapid growth of cellular networks raises enormous constraints to mobile operators, especially due to the limited frequency spectrum allocated to cellular networks. Due to the tremendous increase of mobile equipments like smart phones and the compelling services that offer broadband mobile, frequency reuse that characterizes cellular networks is not sufficient to overcome these issues. The recent discovery of white spaces in the spectrum becomes an open field full of new challenges. Here, the most challenging issue is to use the spare spectrum in a way to allow flexibility between licensed and unlicensed users. In fact, with the discovery of white spaces, licensed users have the preemptive right to access the spectrum when unlicensed users use the idleness of the spectrum to transmit. Cognitive radio technique brings opportunities to the spectrum management. In this thesis, we propose an analysis on the improvement of the spectrum usage. We consider the case of broadband cellular networks in cognitive radio. Our study will bench on three important axis. The first consist on the review of the cognitive radio cycle to make it more dynamic. We will design a cognitive cycle joined to the Radio Resource Management (RRM) to fit with the rapid changes in the spectrum. That will lead us to the second axis, where we will study the spectrum mobility as an important way to optimize spectrum usage. Here, we will concentrate on the spectrum handoff. During that analysis, we will propose a new spectrum handoff sequence based on the PRP M/G/1queuing network model. We will then introduce a new metric that allows better understanding of spectrum handoff sequences. On the third axis we will discuss the FEMTOCELL examining the contributions of FEMTOCELL to actual cellular networks, while minimizing interruptions between them. Additionally, we will analyze present contributions and evaluate the limitations they face. Finally we will propose a discussion topic based on the frequency reuse in FEMTOCELL and cognitive radio capabilities.

全文目录

Abstract  4-5
Table of Contents  5-7
Introduction  7-8
1 Broadband Cellular Networks  8-12
  1.1 Survey on Broadband Cellular Networks  8-10
    1.1.1 Cellular Networks  8
    1.1.2 Basic Concepts  8
    1.1.3 Generations of Cellular Networks  8-9
    1.1.4 Frequency Reuse in Cellular Networks  9-10
  1.2 On The Broadband  10-11
    1.2.1 Mobile Broadband  10
    1.2.2 Cellular Broadband  10
    1.2.3 Generations  10-11
  1.3 Summary  11-12
2 Dynamique Spectrum Usage  12-21
  2.1 Problem Statement  12
  2.2 Cognitive Radio to Manage Spare Spectrum  12-15
    2.2.1 Definitions  12-13
    2.2.2 Cognitive Radio Networks Architecture  13-14
    2.2.3 Opportunities and Challenges  14-15
    2.2.4 Cognitive Cycle  15
  2.3 Cognitive Radio Joined to RRM  15-18
    2.3.1 Background  15-16
    2.3.2 RRM in Cognitive Radio Networks  16-18
  2.4 Spectrum Mobility to Optimize Spectrum Usage  18-19
  2.5 Summary  19-21
    2.5.1 Analyzing Network Model  19
    2.5.2 Spectrum Handoff Sequences  19-20
    2.5.3 Analyzing metrics  20-21
3 The PRP M/G/1 Queuing Network Model  21-25
  3.1 Background of Queuing Models  21
  3.2 Queuing Mechanisms  21-23
    3.2.1 First-In,First-Out(FIFO)Queuing  22
    3.2.2 Priority Queuing(PQ)  22
    3.2.3 Fair Queuing(FQ)  22-23
  3.3 Examples of Queuing Models  23
  3.4 Summary  23-25
4 Spectrum Handoff Sequences(SHS)  25-26
  4.1 The Always-Leaving Sequence  25
  4.2 The Always-Staying Sequence  25
  4.3 Proposed Novel SHS  25-26
    4.3.1 Definition  25-26
5 The EDDT Lifetime to Analyze SHSs  26-32
6 Femtocell To Optimize Spectrum Efficiency  32-39
  6.1 Femtocell Technology  32-34
    6.1.1 Why Femtocell  32-34
    6.1.2 History  34
  6.2 Femtocell and Cellular Networks  34-36
    6.2.1 Femtocell and Macrocell  34-35
    6.2.2 Limitations  35-36
  6.3 Proposed Ideas  36-38
    6.3.1 Proposed Cognitive Radio Architecture  37-38
    6.3.2 Related Work and Proposed Idea on Frequency Reuse  38
  Third Conclusion  38-39
Conclusion  39-40
References  40-42

宽带蜂窝网中基于认知无线电频谱使用优化的研究

内容摘要

全文目录

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