一個 OFDMA 下行鏈路 MRU 分配方案以最大化 IEEE 802.11be WLAN 效能

An OFDMA Downlink MRU Allocation Scheme to Maximize Throughput for IEEE 802.11be WLANs

黃聖哲(Sheng-Che Huang)

指導教授 ： 石貴平

淡江大學/工學院/資訊工程學系碩士班/碩士(2024年)

https://doi.org/10.6846/tku202400739

摘要

本論文針對無線區域網路(Wireless Local Area Network ,WLANs)中的Orthogonal Frequency Division Multiple Access (OFDMA) 產生的資料單元(Resource Units, RU)分配問題，提出了有效的解決方案。在下一代IEEE 802.11be 協議為OFDMA機制引入了新的資料型態，稱為Multiple Resource Units(MRU)，該型態支持將多個RU分配給單個使用者，使得頻寬利用率提升，RU分配的模式變得更加靈活。但是該資料型態有著嚴格的位置限制，使得分配MRU變成一個難題。我們發現RU在未經分配的狀態下，很可能會導致頻寬浪費的問題，這會使得總體吞吐量下降。在本文所提出的方案中不僅透過MRU分配策略改善了回合傳輸時間，還針對MRU擺放問題進行了優化，考慮不同的MRU組合為效能帶來的影響。最終根據模擬結果，本文所提的方案在傳輸時間、吞吐量上都優於其他方案。

關鍵字

IEEE 802.11be ； WLANs ； OFDMA ； 資源分配 ； 服務品質

並列摘要

This paper addresses the issue of Resource Unit (RU) allocation in Wireless Local Area Networks (WLANs) using Orthogonal Frequency Division Multiple Access (OFDMA). In the next-generation IEEE 802.11be standard, a new data type called Multiple Resource Units (MRUs) is introduced for the OFDMA mechanism. MRUs allow multiple RUs to be allocated to a single user, enhancing bandwidth utilization and providing more flexible RU allocation patterns. However, MRUs come with strict placement restrictions, making their allocation a challenging problem. We found that unallocated RUs can lead to bandwidth waste, which in turn decreases overall throughput. The solution proposed in this paper not only improves transmission time through an optimized MRU allocation strategy but also addresses the MRU placement issue, considering the impact of different MRU combinations on performance. Simulation results demonstrate that the proposed solution outperforms other schemes in terms of transmission time and throughput.

並列關鍵字

IEEE 802.11be ； OFDMA ； Resource Allocation ； QoS ； WLANs

參考文獻

[1]. Y. -C. Chen and C. -Y. Liao, "A study of QoS feedback schemes on WiFi multicast for media streaming services," 2016 Third International Conference on Digital Information Processing, Data Mining, and Wireless Communications (DIPDMWC), Moscow, Russia, 2016, pp. 278-283.

[2]. J. Kim, A. Deep and C. -h. Hahm, "An improvement of audio transfer QoS over 802.11 WiFi Network environment," The 18th IEEE International Symposium on Consumer Electronics (ISCE 2014), Jeju, Korea (South), 2014, pp. 1-2.

[3]. B. Bellalta, "IEEE 802.11ax: High-efficiency WLANS," in IEEE Wireless Communications, vol. 23, no. 1, pp. 38-46

[4]. J. -C. Chen and K. -W. Cheng, "EDCA/CA: Enhancement of IEEE 802.11e EDCA by Contention Adaption for Energy Efficiency," in IEEE Transactions on Wireless Communications, vol. 7, no. 8, pp. 2866-2870.

[5]. J. He, B. Tan and Y. Gao, "Reinforcement Learning based Downlink OFDMA Scheduling for Time-Sensitive WiFi Networks," 2023 IEEE/CIC International Conference on Communications in China (ICCC), Dalian, China, 2023, pp. 1-6.