針對LTE TDD模式，設計以流量為基礎之整合式省電機制

Load-Based Power Saving Integrating Real-Time and Non-Real-Time Traffic in LTE TDD

潘政穎(Zheng-Ying Pan)

指導教授 ： 楊峻權

國立暨南國際大學/科技學院/資訊工程學系/碩士(2015年)

https://doi.org/10.6837/NCNU.2015.00034

摘要

Long Term Evolution (LTE)是目前4G標準中最被看好的一種無線網路接取技術。在LTE架構之下，規範了行動用戶(User Equipment, UE)如何透過無線訊號與LTE核心網路(Evolved Packet Core, EPC)的基地台(E-UTRAN NodeB, eNB)連線並進行無線通訊；其中LTE TDD (Time-Division Duplex )是LTE的一種分時多工的實作模式，根據不同的TDD configuration在支援非對稱的服務上具有一定的靈活性。此外，由於越來越多的服務在UE上執行，但是電池的技術卻沒有重大的突破，因此，省電的方式一直是眾多無線網路研究中的一大重點。
本文探討如何在LTE TDD的網路中，使用以流量為基礎的省電機制。分析在LTE TDD網路上執行流量為基礎的省電機制之問題後，根據分析結果本文提出以虛擬時間軸和對應方法的修改方案，並整合real-time traffic與non-real-time traffic到修改方案中，分別提出LTE-TDD-Aggr、LTE-TDD-Split與LTE-TDD-Merge三種機制，模擬結果顯示所提的機制，相較於標準的DRX，最多可提升90%的省電效能。

關鍵字

長期演進分時多工模式 ； 非連續接收模式 ； 以流量為基礎之省電機制 ； 省電機制 ； 即時傳輸 ； 非即時傳輸

並列摘要

Long Term Evolution (LTE) is one of radio access technology standards, and it is the most promising 4G mobile data transmission technology at present. Connections establishment and wireless communications between mobile users (User Equipment, UE) and base stations (eNB) of LTE core network are standardized in LTE. TDD (Time-Division Duplex) is one of implementing modes in LTE. By adopting different TDD configurations, LTE asymmetric services have achieved more flexibility. In addition, there are more and more services performed on the UE, but battery technology don't have major improvement. Therefore, power saving becomes one of research issues in wireless networks.
This thesis investigates implementation Load-Based Power Saving (LBPS) mechanisms in LTE TDD. By analyzing the problem of load-based power saving mechanism which is performed on LTE TDD network, new modified mechanisms including virtual timeline and mapping methods are developed. Three mechanisms, namely LTE-TDD-Aggr, LTE-TDD-Split and LTE-TDD-Merge, that integrating real-time and non-real-time traffic are proposed in the thesis. The simulation study shows that the proposed mechanisms have up to 90% enhancement for power efficiency compared to the DRX standard.

並列關鍵字

LTE TDD ； DRX ； LBPS ； Power Saving ； Real-Time-Traffic ； Non-Real-Time Traffic

參考文獻

[1] S. Sesia, I. Toufik and M.P.J. Baker, LTE – The UMTS Long Term Evolution: From Theory to Practice, Wiley, Apr. 2009.

[2] 3GPP TS 36.321, “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification,” Rel. 8, v8.0.0, Dec. 2007

[3] S. Fowler, G. Baravdish, and Y. Di, “Numerical Analysis of an Industrial Power Saving Mechanism in LTE,” IEEE International Conference on Communications (ICC), 10-14 Jun. 2014, pp. 1748-1753, Sydney, NSW

[4] H.-C. Wang, C.-C. Tseng, G.-Y. Chen, F.-C. Kuo, and K.-C. Ting, “Power Saving by LTE DRX Mechanism Using A Mixture of Short and Long Cycles,” IEEE TENCON Region 10 Conference, 22-25 Oct. 2013, pp. 1-6, Xi’an

[5] R.-S. Bhamber, S. Fowler, C. Braimiotis, and A. Mellouk, “Analytic Analysis of LTE/LTE-Advanced Power Saving and Delay with Bursty Traffic,” IEEE International Conference on Communications (ICC), 9-13 Jun. 2013, pp. 2964-2968, Budapest