NB-IoT隨機存取方法及其資源調適性配置之研究

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姓名

薛貫一(Guan-Yi Xue) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

NB-IoT隨機存取方法及其資源調適性配置之研究
(Study of Random Access Scheme and Its Resource Adaptive Allocation in NB-IoT Network)

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摘要(中)

為因應物聯網的應用，第三代合作夥伴計畫(3rd Generation Partnership Project, 3GPP)於Release 13中提出了窄頻物聯網(Narrowband Internet of Things, NB-IoT)技術，將原先LTE的上行排程加以改善，以子載波與時槽數目決定排程的長短，設計出更符合物聯網多裝置、短資料特性的傳輸需求，Release 14更進一步開放在非錨載波(non-anchor carrier)上使用隨機存取排程的功能，如此一來可舒緩所有UE都透過錨載波(anchor carrier)參與隨機存取競爭造成壅塞的情形。
然而一旦將non-anchor carrier用於隨機存取通道排程就壓縮了Narrowband Physical Uplink Shared Channel(NPUSCH)資源排程的空間，因此eNB該如何安排non-anchor carrier排程使其能在對資料通道影響最小的情況下提高隨機存取成功率，將成為一重要議題。
本論文所設計演算法根據UE回報的碰撞情形進行統計與分析，在不同UE數量下可動態配置對應的隨機存取通道資源大小，在盡量節省資源的情況下同時保持UE隨機存取成功機率。

摘要(英)

3rd Generation Partnership Project (3GPP) proposed NB-IoT for IoT application in Release 13. It improves the scheduling for uplink from original LTE which determines the length of NPUSCH (Narrowband Physical Uplink Shared Channel) by the number of subcarriers and slots in NB-IoT. This design supports the IoT scenario which have the feature of massive devices and short data transmission. In Release 14, 3GPP also proposes that random access procedures can be supported in non-anchor carriers which can ease the congestion if all the UE used random access resource by anchor carrier.
However, if eNB schedules NPRACH (Narrowband Physical Random Access Channel) in non-anchor carrier then it also compresses the resource that NPUSCH can use. So how to use non-anchor carrier resource efficiently would be an important issue.
In this paper, we propose an algorithm which dynamic allocates non-anchor carrier resource adaptive according to the collision report send by UE. Finally, we try to strike a balance between keeping the random access successful rate and saving non-anchor carrier resource as far as possible.

關鍵字(中)

★ 窄頻物聯網
★ 非錨載波
★ 隨機存取

關鍵字(英)

★ NB-IoT
★ Non-Anchor Carrier
★ Random Access

論文目次

摘要 I
ABSTRACT II
目錄 IV
圖目錄 VI
表目錄 X
1. 第一章緒論 1
1.1. 研究背景 1
1.2. 研究動機與目的 1
1.3. 章節概要 2
2. 第二章相關研究背景 3
2.1. NB-IoT基本介紹 3
2.1.1. 佈署模式 3
2.1.2. 訊框架構 4
2.1.3. 通道設計 4
2.1.4. 上行通道與資源 5
2.1.5. 下行通道與資源 6
2.1.6. 錨載波(anchor carrier)與非錨載波(non-anchor carrier) 7
2.1.7. 其他相關技術介紹 8
2.2. 相關文獻 10
2.2.1. 上行隨機存取議題 10
2.2.2. 下行排程議題 14
2.2.3. 3GPP標準制訂演進 17
3. 第三章研究方法 20
3.1. 系統架構 20
3.2. UE之Collision Report Flag(CRF)夾帶 21
3.3. eNB端CRF演算法 24
3.3.1. 系統參數 24
3.3.2. CRF演算法流程 25
3.3.3. 競爭與免競爭運作方式 27
4. 第四章模擬結果與討論 29
4.1. 模擬環境 29
4.2. 模擬結果分析 31
4.2.1. 系統參數門檻值之分析 31
4.2.2. Rf 分布分析 34
4.2.3. CRF競爭方式與固定carrier之效能分析 36
4.2.4. CRF同時採用競爭、免競爭方式下之效能比較 42
4.2.5. 使免競爭方式具優勢之環境討論 60
5. 第五章結論 67
6. 參考文獻 68

參考文獻

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指導教授

陳彥文(Yen-Wen Chen)

審核日期

2018-8-14

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