| 摘要(英) |
The fifth generation mobile communication (5G) is becoming more and more mature. The International Telecommunication Union (ITU) defines the application of 5G as three scenarios: Ultra-reliable and Low Latency Communications (uRLLC), Enhanced Mobile Broadband (eMBB) and Massive Machine Type Communications (mMTC). uRLLC emphasizes low-latency and highly reliable transmission. eMBB focuses on the number of transmissions and the amount of data transmitted. How to allocate resources to make each other have better performance when two different types of devices coexist is a key point. When the devices has data to upload it will need to go through random access procedure. The fetch program is connected to the base station. but the number of Preambles that a base station can provide is limited. Therefore, when a large number of devices random access at the same time.Collisions will occur and the transmission performance will be affected.
This paper divides the Preambles into three groups and proposes three different methods of dynamically adjusting the number of Preambles: uRLLC Priority Dynamic Allocation, eMBB Priority Dynamic Allocation and Reserved Dynamic Allocation. Observes the use of Preambles by different devices in the system at regular intervals and adjust them in the next period of time. Allocating and adjusting the number of Preambles in each group to improve the transmission performance of different types by dynamically.
From the simulation results, it can be seen that the uRLLC Priority Dynamic Allocation method can more effectively utilize the Preamble of each group and improve the success rate of the devices. eMBB Priority Dynamic Allocation causes the performance of the uRLLC device to drop significantly due to the priority processing of the eMBB device. Reserved Dynamic Allocation proves that in an environment where two different device types coexist, it is necessary to properly reserve resources for uRLLC devices. |
| 參考文獻 |
[1] "Study on Scenarios and Requirements for Next Generation Access Technologies," 3GPP TR 38.913 (Rel.16), 07 2020.
[2] ITU-R, "M.2083 : IMT Vision - Framework and overall objectives of the future development of IMT for 2020 and beyond," 9 2015.
[3] "Technical Specification Group Radio Access Network ; NR;Physical channels and modulation," 3GPP TS 38.211 (Rel.16), 1 2021.
[4] [Online]Available:https://www.sharetechnote.com/html/5G/5G_FrameStructure.html
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[6] "NR and NG-RAN Overall description; Stage-2," 3GPP TS 38.300 (Rel.16), 1 2021.
[7] "Radio Resource Control (RRC);Protocol specification," 3GPP TS 38.331(Rel.15), 1 2020.
[8] [Online]Available:https://github.com/wjhgh04/lte_study/blob/master/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3LTE-A.pdf
[9] Yan Liu, Yansha Deng, Maged Elkashlan, Arumugam Nallanathan, and George K. Karagiannidis, "Analyzing Grant-Free Access for uRLLC Service," IEEE Journal on Selected Areas in Communications, vol. 39, no. 3, March, 2021.
[10] Jayashree Thota and Adnan Aijza, "On Performance Evaluation of Random Access Enhancements for 5G uRLLC", 2019 IEEE Wireless Communications and Networking Conference (WCNC)
[11] Yifan Chen, Guohui Wang, Huiyue Yi, Wuxiong Zhang, "Priority-based Distributed Queuing Random Access Mechanism for mMTC/uRLLC Terminals Coexistence", 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring)
[12] Seokjae Moon and Jang-Won Lee, "Integrated Grant-Free Scheme for uRLLC and mMTC," IEEE 5G World Forum (5GWF), 2020.
[13] Jie Liu, Mamta Agiwal, Miao Qu, Hu Jin, "Online Control of Preamble Groups With Priority in Massive IoT Networks", IEEE Journal on Selected Areas in Communications, vol. 39, no. 3, March 2021. |
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