簡易檢索 / 詳目顯示
| 研究生： |
郝珮伶 Pei-Ling Hao |
|---|---|
| 論文名稱： |
5G物聯網環境下之分群隨機存取演算法研究 Study of Group Based Random Access Algorithms in 5G IoT Environment |
| 指導教授： | 陳彥文 |
| 口試委員: | |
| 學位類別： |
碩士 Master |
| 系所名稱： |
資訊電機學院 - 通訊工程學系 Department of Communication Engineering |
| 論文出版年： | 2023 |
| 畢業學年度： | 111 |
| 語文別： | 中文 |
| 論文頁數： | 72 |
| 中文關鍵詞： | 隨機存取 、分群 、MTCD 、Preamble |
| 外文關鍵詞： | Random Access, Cluster, MTCD, Preamble |
| 相關次數： | 點閱：15 下載：0 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
為了支援物聯網以及機器對機器（M2M）應用不斷增長的需求， M2M設備的數量大幅增加，但隨之而來會造成嚴重的隨機接入網路（Random Access Network, RAN）壅塞，因此緩解隨機存取通道（RACH）中的接入壅塞和支援大量MTCD被認為是未來行動通訊中重要的需求。
本篇論文主要是想要解決基地台的接入壅塞問題，因此將大量的MTCD分群以減少參與隨機存取的對象，從而提高隨機存取的成功率；當MTCD有封包產生時，便會根據封包延遲的時間來計算自己的權重，並且基地台會定期廣播一門檻值，讓到達門檻值的MTCD可以參與競爭。
基地台會在一個Frame的時間內觀察系統Preamble的使用情形，根據Preamble成功、碰撞、空閒的比例，來調整下一個Frame的門檻值。
最後透過模擬的方式來驗證所提出來的方法可以提高系統的隨機存取成功率，並且還調整了各種變因來研究在何種狀況下，比較適合本論文的方法。
To support the growing demand for Internet of Things (IoT) and Machine-to-Machine (M2M) applications, there has been a significant increase in the number of M2M devices. However, this growth also brings the potential for severe congestion in the Random Access Network (RAN). Therefore, mitigating access congestion in the Random Access Channel (RACH) and supporting a large number of Machine Type Communication Devices (MTCDs) are considered crucial requirements in future mobile networks.
This paper aims to address the access congestion issue in base stations by grouping a large number of MTCDs to reduce the contention for random access, thereby improving the probability of successful contention. When an MTCD generates a packet, it calculates its priority based on packet delay time, and the gNB periodically broadcasts a threshold value, allowing MTCDs reaching the threshold to participate in contention.
The gNB observes the usage of preambles in the system within a frame duration and adjusts the threshold value for the next frame based on the ratio of successful preambles, collisions, and idle slots.
Finally, we validate the proposed method through simulations, demonstrating its effectiveness in improving the system's random access success rate. We also adjusted various factors to study under which conditions the method presented in this paper is suitable.
[1]"RAN Improvements for Machine-type Communications," 3GPP TR 37.868 (Rel.11), 10 2011.
[2]W. Sun, J. Liu and H. Zhang, "When smart wearables meet intelligent vehicles: Challenges and future directions", IEEE Wireless Commun., vol. 24, no. 3, pp. 58-65, Jun. 2017.
[3]D. Niyato, L. Xiao and P. Wang, "Machine-to-machine communications for home energy management system in smart grid", IEEE Commun. Mag., vol. 49, no. 4, pp. 53-59, Apr. 2011.
[4]A. Laya, L. Alonso and J. Alonso-Zarate, "Is the random access channel of LTE and LTE-A suitable for M2M communications? A survey of alternatives", IEEE Commun. Surveys Tuts, vol. 16, no. 1, pp. 4-16, 2014.
[5] "Technical Specification Group Radio Access Network ; NR;Physical channels and modulation," 3GPP TS 38.211 (Rel.17), 1 2023.
[6]"5G/NR-FrameStructure" [Online]. Available: https://www.sharetechnote.com/html/5G/5G_FrameStructure.html. [Accessed 07 2023].
[7]"Study on New Radio (NR) access technology", 3GPP TR 38.912 (Rel.17) 3 2022.
[8]"Technical Specification Group Radio Access Network; NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone version 17.9.0," 3GPP TS 38.101-1 (Rel.17), 3 2023.
[9]"NR and NG-RAN Overall description; Stage-2," 3GPP TS 38.300 (Rel.17), 4 2023.
[10]"UL small data transmission use cases and requirements",3GPP R2-1708447, Veolia, RAN2#99.
[11]N. Li, Y. He, C. Wang, Y. Chen and J. Xu, "Energy-efficient power allocation for massive M2M communication over LTE-A cellular uplink", J Wireless Com Network, no. 259 (2018) , pp.1-11, Nov. 2018.
[12]J. Huang, W. Zhan, X. Sun, P. Liu and D. Kong, "Cluster-based Group Paging Scheme with Preamble Reuse for mMTC in 5G Networks", GLOBECOM 2020 - 2020 IEEE Global Communications Conference, pp.1-6, Taipei, Taiwan, Dec. 2020.
[13]Y. Chen, G, Wang, H. Yi and W. Zhang, "Priority-based Distributed Queuing Random Access Mechanism for mMTC/uRLLC Terminals Coexistence", 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring), pp. 1-6, Helsinki, Finland, Apr. 2021.
[14]L. Liang, L. Xu, B. Cao and Y. Jia, "A cluster-based congestion-mitigating access scheme for massive M2M communications in internet of things" , IEEE Internet Things J., vol. 5, no. 3, pp. 2200-2211, Jun. 2018.
[15]S. Xu, J. Li and X. Qin, "Grouping Based Uplink Resource Allocation for Massive M2M Communications over LTE-A", 2017 IEEE 86th Vehicular Technology Conference (VTC2017-Fall), Toronto, ON, Canada, pp. 1-5, Sep. 2017.
[16]W. Lee, J. Kim "Performance Evaluation of OCW Control Algorithm in IEEE 802.11ax Networks", 2022 13th International Conference on Information and Communication Technology Convergence (ICTC), Jeju Island, Korea, pp. 1-3, Oct. 2022.
