| 摘要(英) |
LTE-MTC (Machine-Type Communication) is designed for IoT applications, compared to traditional Human-to-Human (H2H); MTC communication has several features, such as: extremely low power consumption, low mobility, lower data transmission, and non-recurring data transmission. MTC devices are more than traditional H2H devices in quantity. When the standards of MTC communication services are used for H2H communication, each layer of the architecture in mobile communication network may face the serious congestion problem.
The main research of this thesis is that a large quantities of random access collisions will occur and cause the impacts on the quality of network service when a large amounts of MTC devices try to connect with the base station at the same time; allocating 64 preambles to compete with different devices through the contention based (devices competition) and contention-free based (base station assignment). By dynamically adjusting preambles to ease the congestion and packet delay to improve the service quality of network. The so-called “dynamic adjustment” is to calculate the usage rate and estimate the carrying capacity through the usage level of preambles in base station. Two-stage and three-stage dynamic methods are proposed to evaluate whether to adjust the preambles dynamically through the carrying capacity. Then, according to the adjusted quantities of preambles, SIB parameters are modified in the base station and eNB broadcasts (pages) to the MTC devices in each cycle. Allocating preambles effectively to let the devices to compete and be assigned, eventually, it could reduce devices collision in order to improve the system performance.
The simulation part utilizes different level of MTC devices and probability of P random access. It is known from the simulation results that proposed dynamic adjustment method can reduce the random access time effectively by more than half of the random access time in which devices without dynamic adjustment. Please refer to Chapter 4 for simulation results and discussion. |
| 參考文獻 |
[1]. 3GPP, “3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Service requirements for Machine-Type Communications (MTC); Stage 1 (Release 14),” 3GPP, Tech. Spec. 3G TS 22.368, Jul. 2017.
[2]. TANET2013 臺灣網際網路研討會, “機器型態通訊於下一代行動通訊網路之挑戰”, 2013.
[3]. 3GPP, “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 15),” 3GPP, Tech. Spec. 3G TS 36.300, Oct. 2018.
[4]. 金輝，深入理解 LTE-A 第二版，2014
[5]. 3GPP, “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial
Radio Access (E-UTRA) ; Overall description; Stage 2 (Release 15),” 3GPP, Tech. Spec. 3G TS 36.321, Sep. 2018
[6]. 林柏志，LTE-A 隨機接入程序，碩士論文，國立台北科技大學電腦與通訊研究所，台北，2013。
[7]. Md Shipon Ali, Ekram Hossain, and Dong In Kim, " LTE/LTE-A Random Access for Massive Machine-Type Communications in Smart Cities," IEEE Trans. on Wireless Comm., Jun 2017.
[8]. 中興通訊，中國國家知識財產局發明專利，CN 102271400 A 一種網絡設備及其傳輸路損功率門限配置的方法，2011.
[9]. Lien, S.-Y., Liau, T.-H., Kao, C.-Y., and Chen, K.-C., "Cooperative Access Class Barring for Machine-to-Machine Communications," IEEE Trans. on Wireless Comm., Vol. 11, No. 1, Jan 2012.
[10]. MATLAB R2018a：https://www.matlab.com/
[11]. 3GPP, “rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); (Release 15),” 3GPP, Tech. Spec. 3G TS 36.331, Jun. 2018. |
[Endnote RIS 格式]
[相關文章]
[文章引用]
[完整記錄]
[館藏目錄]
[檢視]
plurk
funp
live
udn
HD
myshare
netvibes
friend
youpush
delicious
baidu
Google bookmarks
del.icio.us
hemidemi
facebook
twitter
google
reddit