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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65538


    Title: Study of Radio Resource Reallocation for Hotspots in LTE Network
    Authors: 蔡甫源;Chuan,Fu-yuan
    Contributors: 通訊工程學系
    Keywords: LTE;蜂窩式網路;LTE-Advanced;Frequency Reuse;軟體定義網路;資源分配;LTE;Cellular Network;LTE-Advanced;Frequency Reuse;Software-Defined Networking;Resource Reallocation
    Date: 2014-08-14
    Issue Date: 2014-10-15 17:03:09 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 在Open Networking Foundation提出了軟體定義網路(Software Defined Network, SDN)系統,在其架構下可配合多變的需求,提供彈性的頻寬管理以提升系統效率。SDN的主要概念在分離控制與資料傳送,透過緊密的集中控制,除可提供更有效率之網路安全管理外,亦能配合需求動態的調整整體網路資源,讓系統資源的使用達到最大化。
    於本篇的論文中我們著重於在LTE-Advanced 系統下利用SDN的方式提高蜂巢式網路的吞吐量,針對其有限頻段提出了平均調整(Average Allocation)以及集中調整(Focus Allocation)兩種方式進行調整Resource Block的資源分配方法以及調整前排除干擾的方法。本論文通過兩種不同的Frequency Reuse Factor ,分別是 1/7與1/12 的蜂巢式網路類型做資源分配的情境模組去驗證所提出的方法的有效性。透過模擬的方式驗證出在hotspots 數不同與負載不平衡的情況地下將會被影響。
    最後我們將會透過所架設的情境模擬的方式來證明所提出來的方法能夠有效提高系統吞吐量,並且於兩種方法中以平均調整的方法最能提高系統吞吐量,相對集中調整的方法來說,平均調整處理的繁雜度較高,所以在Hotspots數量較少的情況下,集中調整方法就能夠滿足系統吞吐量的需求。
    ;The Software Defined Network (SDN) architecture, which is defined by Open Networking Foundation (ONF), can provide flexible bandwidth management for changeable demands to achieve high efficiency in resource utilization. The basic concept of SDN is to separate the control plane and data plane. By using the tightly and centralized control, the SDN can not only provide effective network security management, but also dynamically adjust the network resource according to the requirement to maximize the system through.

    In this thesis we bring forward LTE-Advanced system by using SDN concept to improve cellular network throughput. Both of Average Allocation(AA) and Focus Allocation(FA) methods are proposed to proceed reallocated Resource Block(RB) under the avoidance of subcarrier interference. Two examples with frequence reuse factor 1/7 and 1/12 were adopted to examine the efficiency of the proposed methods. The performance impacts of different numbers of hotspot cells with unbalanced traffic load scenarios were examined through simulations.

    The simulation results illustrate that both methods can improve the system throughput in above scenarios. And the AA method can improve the throughput of hotspot cells more as compared with the FA method. However, the reallocation process of AA is more complex than that of the FA method.
    Appears in Collections:[通訊工程研究所] 博碩士論文

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