在LTE-A網路下整合RN及UE之省電機制

Integrated Power Saving for Relay Node and User Equipment in LTE-A

劉諧樺(Hsieh-Hua Liu)

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(2014年)

https://doi.org/10.6837/NCNU.2014.00318

摘要

LTE-Advanced (LTE-A)是目前4G標準的無線網路接取技術，在LTE-A提供了100MHz的頻寬，並且當使用者靜止時下載速度可達1Gbps，在高速移動的情況下也可達100Mbps的傳輸速度，但由於LTE-A為了要支援更大的訊號覆蓋範圍以及更快的傳輸速度，但卻又不想架設成本較高的基地台，所以LTE-A網路中加入了訊號中繼的概念，Relay Node (RN)設備能夠做為訊號的延伸，RN的優勢在於不需要實體線路，因此能將RN建置於室內或是都市熱點，以提升基地台訊號覆蓋範圍以及降低建築物所產生之遮蔽問題，但由於RN可能是依靠電池提供電力，所以要如何延長RN的電池壽命以及符合現代環保的概念，省電(Power Saving)成為一個非常重要的議題。
我們實驗室先前的研究提出了LTE中以流量為基礎的省電機制LTE-LBPS，但由於LTE-A中RN加入，除了RN本身也要省電以外，在排程上也需要把backhaul link也考慮進來，因此我們提出分別以UE及RN效能為考量之省電機制UE-1st以及RN-1st的兩種角度來設計省電機制，再UE-1st有三種作法LBPS-Aggr、LBPS-Split、LBPS-Merge以及RN-1st中的LBPS-Split、LBPS-Merge兩種作法，並由模擬結果顯示在UE-1st三種作法中能同時使UE及RN有空間進入sleep mode，並比傳統DRX有著更好的PSE，在RN-1st中也能使RN的PSE滿足事先給定的門檻值。

關鍵字

長期演進升級版 ； 非連續接收模式 ； 以流量為基礎之省電機制 ； 省電機制 ； 中繼節點

並列摘要

LTE-Advanced (LTE-A) is one of the radio access technology standards developed by the 3GPP organization, and it is also the standard of 4G mobile data transmission technology at present. LTE-A provides up to 100MHz system bandwidth and 1Gbps transmission rate when users are static. In the high mobility environment, it can still provide 100Mbps transmission rate. In order to extend the coverage area and provide higher data transmission rates , the concept of Relay Node (RN) which is more flexible than eNB was proposed. RN acts as a signal forwarder to extend coverage and does not need physical wired connection with DeNB, so it can be deployed at any place to provide larger coverage and reduce shadowing issues arising form building. Same as other wireless networking devices, RN maybe rely on batteries for power supply. Without proper power management, the energy required to keep RN connected to the DeNB maybe quickly dissipate after a period of time. Therefore, power saving for LTE-A has been an important issue in recent years.
Our previous work has been working on the issue of power saving in LTE. The idea of Load-Based Power Saving (LBPS) in LTE was proposed to adaptively schedule the sleep time of the user equipments based on the current network load. In this thesis, due to RN need extra subframe for backhaul link to receive data is taken into consideration. The previously proposed LTE-LBPS related schemes are extended to integrate both UE and RN in sleep scheduling. Two strategies of integrated power saving LTE-LBPS schemes, namely UE-1st and RN-1st, are proposed in the thesis. The simulation study shows that the proposed UE-1st scheme can effectively achieve higher power saving efficiency for both RN and UE. Moreover, proposed RN-1st scheme can also achieve the predefined power saving threshold.

並列關鍵字

LTE-A ； DRX ； LBPS ； Power Saving ； Relay Node

參考文獻

Reference

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

[2] 3GPP TS 36.300, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN),” Rel. 10, v10.3.0, March 2011.

[3] Z. Ma, Y. Zhang, K. Zheng, W. Wang and M. Wu, “Performance of 3GPP LTE-Advanced Networks with Type I Relay Nodes,” Proceedings, International ICST Conference on Communications and Networking in China (CHINACOM), Aug. 2010 , pp. 1-5.

[4] O. Teyeb, F. Frederiksen, V.V. Phan and B. Raaf, “User Multiplexing in Relay Enhanced LTE-Advanced Networks,” Proceedings, IEEE Vehicular Technology Conference (VTC), May 2010, pp. 1-5.