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研究生： 王聖元
Wang, Sheng-Yuan
論文名稱： 針對上行鏈路高可靠低延遲服務基於非正交多重存取的使用者分群與排程方法
NOMA-Based User Grouping and Scheduling for Uplink URLLC Services
指導教授： 高榮駿
Kao, Jung-Chun
口試委員: 趙禧綠
Chao, Hsi-Lu
楊舜仁
Yang, Shun-Ren
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 資訊工程學系
Computer Science
論文出版年： 2022
畢業學年度： 111
語文別： 英文
論文頁數： 61
中文關鍵詞： 高可靠低延遲 、配置授權 、無競爭 、非正交多重存取 、連續干擾消除 、資源分配 、資源排程
外文關鍵詞： URLLC, Configured-grant, Contention-free, NOMA, SIC, Resource allocation, Resource scheduling
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    • 高可靠低延遲傳輸 (URLLC) 是由第五代 (5G) 行動通訊網路新無線技術 (NR) 提出的一種有展望的服務。為了在滿足 URLLC 場景下嚴格要求的同時，增強行動網路的表現，這篇論文提出了一種基於非正交多重存取 (NOMA) 的資源配置方式。在上行方向 (UL) 無競爭 (contention-free) 配置授權 (configuredgrant) 傳輸的系統中，使用者無須再花向基地台請求資源 (scheduling request) 的排程時間，以及競爭資源造成傳輸失敗的可能性，且我們假設基地台 (BS) 利用連續干擾消除 (SIC) 的機制來解出訊號，確保傳輸的高可靠度。這篇論文中提出兩個階段：使用者分組機制以及組別排程機制。使用者分組機制的目的是想要在使用相同的無線時頻資源下，服務最大量的使用者。換句話說，要讓所有使用者都能被服務的情況下，使用最少量的無線時頻資源。在發揮最大資源共享效益的同時，我們也顧及到每位使用者的服務品質 (QoS) 。組別排程機制的目標是想要最小化使用者等待資源的時間，也就是盡可能地去縮短當任一位使用者出現傳輸的需求，到它能取得資源的這一段時間。模擬結果展現出我們的機制在滿足 URLLC 要求的使用者數量比現存方法多出不少，在等待時間方面也比較出色，相對在資源使用量以及系統容量的表現也只有稍稍損失甚至持平。

    Ultra-reliable low-latency communications (URLLC) is one of the envisioned services offered by fifth generation (5G) mobile network new radio (NR). We propose a non-orthogonal multiple access (NOMA)-based resource allocation method to enhance performance of mobile networks while still satisfying the stringent requirements of URLLC scenario in the uplink direction (UL). We assume signal is decoded by the successive interference cancellation (SIC) technique and then we focus on contention-free configured-grant NOMA-based transmission. NOMA allows more than one users to share a resource unit simultaneously, improving throughput and spectrum efficiency of overall networks compared with orthogonal multiple access (OMA). Our method consists of two parts: user grouping and group scheduling. The goal of user grouping is to maximize the number of users that can share the same resource unit and satisfy their quality of service (QoS) simultaneously. The aim of grouping scheduling is to schedule groups in an efficient way such that the response time of every user is minimized. Simulation results show that our method outperforms the existing methods in terms of reliability and latency.

    Abstract....................................................i 中文摘要.....................................................ii Contents....................................................iii List of Figures.............................................v 1 Introduction..............................................1 1.1 URLLC...................................................3 1.2 Configured-grant (CG)...................................6 1.3 Concept of NOMA.........................................7 2 Related Work..............................................12 3 System Model..............................................15 3.1 Resource block..........................................16 3.2 Modulation scheme.......................................18 3.3 Turnaround time and response time.......................21 4 User Grouping.............................................23 4.1 Modulation scheme decision..............................23 4.2 Interference margin calculation.........................29 4.3 Candidate selection.....................................33 5 Group Scheduling..........................................36 6 Simulation................................................42 6.1 Simulation settings.....................................42 6.2 Compared methods........................................43 6.2.1 2-NOMA scheme.........................................44 6.2.2 OMA scheme............................................45 6.3 Simulation results......................................46 6.3.1 The number of resource blocks.........................46 6.3.2 Turnaround time.......................................47 6.3.3 The number of satisfied user equipment................48 6.3.4 Response time.........................................49 6.3.5 Throughput............................................50 6.4 Time complexity.........................................51 7 Conclusion................................................53 A Inter-cell Interference...................................54 Reference...................................................56

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