D2D通訊在蜂巢網路下基於干擾-信號比門檻之資源配置

Resource Allocation Based on Interference to Signal Ratio Threshold for Device-to-Device Communication Underlying Cellular Networks

鄭坤昌(Kun-Chang Jheng)

指導教授 ： 潘仁義

國立中正大學/工學院/通訊工程學系/碩士(2015年)

摘要

隨著科技的進化演進，近幾年的行動通訊裝置(手機、平板電腦等)已經非常的普及，行動應用服務日益增長，導致行動資料與日俱增，也使基地台頻寬負荷量，而且頻譜資源也是有限的，因此如何在有限的頻譜資源做有效的規劃達到高速率傳輸，成為一個非常重要的議題。裝置間通訊 (Device-to-Device Communication；D2D通訊) 的技術，可以藉由重複使用蜂巢式網路使用者(Cellular User Equipment ; CUE) 的資源，雖然可以有效提升頻譜使用率，可是也會造成D2D與CUE以及D2D與D2D間的干擾問題，所以D2D使用者如何與適合的CUE一起共享資源，才能達到高速率傳輸將是我們將要探討的問題。
在本篇論文中，D2D使用者不像一般的Cellular User Equipment擁有專屬的資源，而是重複使用CUE的上行資源，當D2D跟CUE一起共享資源時，CUE會對D2D接收端造成嚴重的干擾，同時D2D傳輸端為了保證D2D接收端可以聽得清楚，當加大自己傳輸的Power的同時，也造成D2D對於基地台嚴重的干擾。
本篇論文為了減小上述的干擾問題，提出了一種基於干擾-信號比門檻(Interference Signal Ratio;ISR)之資源配置概念以及於干擾-信號比門檻的資源分配演算法，本篇論文提出的方法的吞吐量可以有效地去接近理論的最佳值，並且使CUE及D2D整體效能不會因受到嚴重干擾而大幅下降。

關鍵字

干擾-信號比門檻 ； 干擾管理 ； 資源重用 ； D2D通信系統 ； 蜂巢網路 ； 4G-LTE ； 最佳化

並列摘要

In recent year, mobile communication devices (cell phone, tablet, etc.) have been very popular. The demand of wireless resource increasing heavily comes from more population using mobile communication and high datarate requirement of various mobile applications. Because spectrum resource is quite limited, it is very important to find ways that can fully utilize resources and realize higher speed transmission.
Device-to-Device Communication (D2D) is one of the proximity based communication technology that reuses Cellular User Equipment (CUE) spectrum in 4G Long Term Evolution-Advanced (LTE-A) systems, which can improve system throughput, but also may cause heavy intra-cell interference problem without proper management.
D2D users may not have dedicated resources, so in such a case D2D users can reuse CUE uplink resource. The CUEs possibly cause severe interference to D2D receivers who reuse the CUEs’ resource. On the other hand, D2D transmitters’ raising transmission power can let signal reception more clearly, but this action also causes serious interference to the base station on receiving CUEs’ uplink transmission.
This paper stiudys a resource allocation algorithm which reduces interference problems with interference - signal ratio threshold (Interference Signal Ratio; ISR). The algorithm confines interference from D2D users to a tolerance value at the CUE’s receiver side by allocating D2D transmitters’ power budget, and uses ISR to rule out the D2D users who are strongly interfered by CUEs or seriously interfere other D2D users contributing better throughput.
Finally, we conclude that the proposed scheme can guarantee CUEs’ target SINR and improve throughput of D2D communications while at the same time suppressing their mutual interference.

並列關鍵字

Optimization ； Interference Management ； Resource Allocation ； Device-to-Device (D2D) ； 4G-LTE

參考文獻

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