研究生: |
彭思穎 Ssu-Ying Peng |
---|---|
論文名稱: |
感知無線電網路對於次要用戶採用緩衝器 與頻譜租用之連結允入控制研究 A Study on Call Admission Control with Buffer and Spectrum Leasing for Secondary Users in Cognitive Radio Networks |
指導教授: |
鍾順平
Shun-Ping Chung |
口試委員: |
鍾順平
王乃堅 林永松 |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電機工程系 Department of Electrical Engineering |
論文出版年: | 2019 |
畢業學年度: | 107 |
語文別: | 英文 |
論文頁數: | 220 |
中文關鍵詞: | 感知無線電網路 、連結允入控制 、頻譜租用 、緩衝器 、次要用戶阻塞機率 、次要用戶中斷機率 、成功送達率 |
外文關鍵詞: | Cognitive radio network, preemptive priority, spectrum leasing, buffer, call admission control,, SU blocking probability, SU dropping probability |
相關次數: | 點閱:349 下載:0 |
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隨著越來越多的裝置追求無線化和行動化的時代來臨,無線頻譜的需求急劇的增加。然而,由於無線頻譜資源有限,並且通常需要官方授權,因此用戶需要支付較高的成本來使用無線頻譜。另一方面,並非所有用戶的資料都需要高度即時性傳輸。為了提高頻譜的利用率,學界提出了感知無線電網路(CRN)的概念,並且定義用戶成兩種類型,即主要用戶(PU)和次要用戶(SU)。主要用戶是頻譜的擁有者,而次要用戶不是頻譜擁有者,如果主要用戶不使用頻譜,則會允許次要用戶來使用無線頻譜的服務。由於主要用戶對於次要用戶具有佔先的優先權,因此我們利用頻譜租用方案來改善次要用戶的服務品質。具體的來說,我們將無線頻譜的一部分分配為租用頻譜。在該租用頻譜中,主要用戶和次要用戶具有相同的優先權,並且次要用戶被中斷的機率降低。此外,系統配有緩衝器以容納被阻塞的次要用戶和被中斷服務的次要用戶,因此次要用戶有更多機會去使用無線傳輸服務。另外,為了增加次要用戶的成功送達率,我們應用三種連結允入控制(CAC)方案以允許SU執行通道聚合。我們分析了不同CAC方案對主要用戶和次要用戶的效能指標的影響。我們重視的效能指標包括主要用戶/次要用戶阻塞機率和次要用戶中斷機率。最後但並非最不重要的是,為了驗證解析結果的準確性,我們使用Visual Studio 2013以C ++編寫電腦模擬程式,以便用於比較解析結果和模擬結果。
As more and more equipment and devices are pursuing the usage of wireless and mobile networks, the demand for wireless spectrum has increased dramatically. However, as the wireless spectrum is limited resource and usually needs a license issued by the authorities, users need to pay a high cost to use the spectrum. On the other hand, not all users’ data require highly immediacy. For the purpose of improving spectrum utilization, the concept of Cognitive Radio Network (CRN) is proposed, and two types of users, namely the primary user (PU) and secondary user (SU) are defined. A PU is the owner of the licensed spectrum, while an SU is not a spectrum owner that is allowed to use the services of the wireless spectrum if the PU is not using it. Since a PU has a preemptive priority over an SU, spectrum leasing is utilized to improve the quality of service of SUs. Specifically, a part of the wireless spectrum is allocated as the leased spectrum. In this leased spectrum, PUs and SUs have the same priority, and the probability of SU being interrupted is reduced. In addition, the system is equipped with a buffer to accommodate the blocked SUs and the preempted SUs, so that the SUs have more opportunities to use the wireless transmission service. Furthermore, in order to increase the SU throughput, three CAC schemes are applied to allow SU to perform channel aggregation. The performance impacts of different CAC schemes on the performance measures of PUs and SUs are analyzed. The performance measures of interest include PU/SU blocking probability and SU dropping probability. Last but not least, to verify the accuracy of the analytical results, a computer simulation program is written in C++ with Visual Studio 2013 for comparing the above measurements between the analytical model and the simulation model.
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