在LTE時間頻率架構下 之D2D廣播與單播裝置發現

在傳統通訊方式通訊時，行動裝置與其他裝置通訊時都必須經過大型基地台（eNB）中繼（Relay）的幫助下，才得以將訊息資料送至給接收端接收，但如果傳送端裝置與接收端裝置都在同一個基地台的網路覆蓋下，這種轉傳的傳統通訊方式則顯得浪費時間。因此3GPP標準組織制定的第四代通訊網路( Long Term EvolutionAdvanced , LTE-Advanced )中，提出了近距離裝置對裝置（Proximity D2D Communications）通訊這項技術，且此技術在近年來已經被認為可以提昇無線資源利用，增進通訊速度，卸載細胞通訊負載，增加通訊容量的有效方法。利用因為距離近的特性，而得到相對好的訊號品質增加整體環境的功率與頻率使用效益。本論文，將針對裝置間通訊前的裝置發現來做研究，裝置發現分成兩種，單播發現以及廣播發現。單播發現的部分著重在於通道品質要好以及發現成功率要高，且單播發現需要兩UE互相發現，所以傳送端需要發送Request、接收端回傳Response，論文也針對單播發現提出了增加單播發現訊號重傳次數的機制還有節省電池能量損耗的訊號功率控制，希望藉由上述的方法可以有效提升系統效能。而廣播發現著重在於能發現越多裝置越好，此部分重點就是要減少發現訊號碰撞的機率，所以提出了eNB對廣播訊號排程的方法，藉由eNB的幫助來降低廣播訊號發生碰撞的情況。

關鍵字

裝置發現；干擾控制；訊號重傳

並列摘要

In the traditional telecommunication, mobiles communicate with other devices have to go through an eNodeB. With the help of eNodeB, communication data are able to transmite to the receivers. However, if the transmitters and receivers are in the same network coverage, the traditional way seems to be waste resources. Therefoe, the 3GPP standard organization has developed the fourth-generation communication system (Long Term Evolution Advanced , LTE-Advanced).In the 4G LTE system, Proximity D2D Communications was proposed. This communication technology could raise the radio resource utilization, increase communication speed, offload the cell communication load, and increase communication capacity. With the short distance feature, user equipments can recive the better signal quality to increase power and frequency efficiency. In this thesis, we focus on user equipments discovery. There are two types of discovery: Unicast discovery and Broadcast discovery. In the unicast discovery, we focus on the better channel quality and the higher discovery success ratio. In the unicast discovery, UEs have to discovery each other. Transmitter transmits the request signal to receiver, and the receiver transmits the response signal back to transmitter. We consider four factors that could affect system performance, including request retransmitted times, transmition power, DRU selection, transmision power control. In the Broadcast discovery, we focus on the discovered devices as much as possible. We consider two resource scheduling mechanisms in this discovery type. In particular the coordinating schedule can reduce the probability of collision with the eNodeB help.

並列關鍵字

3GPP LTE-advanced ； D2D discovery ； Interference management ； Power control ； Signal Retransmit

參考文獻

[8] 潘泰為, “基於基因演算法下封閉式極微小基地台對資源區塊及傳送功率的自我組態,”國立中正大學, 碩士論文, 2012.

[3] 3GPP TS 36.321: “Evolved Universal Terrestrial Radio Access （E-UTRA）; Medium Access Control （MAC） protocol specification （Release 12）”

[6] 3GPP TS 36.211: “Evolved Universal Terrestrial Radio Access （E-UTRA）; Physical channels and modulation （Release 12）”

[13] Fernando Sanchez Moya, Venkatkumar Venkatasubramanian, et al. “D2D mode selection and resource allocation with flexible UL/DL TDD for 5G deployments”,IEEE ICCW,2015.

[14] Khajonpong Akkarajitsakul, Phond Phunchongharn, et al.”Mode Selection for Energy-Efficient D2DCommunications in LTE-Advanced Networks: ACoalitional Game Approach”,IEEE ICCS,2012.

國際替代計量

在LTE時間頻率架構下之D2D廣播與單播裝置發現

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