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標題: | 異質網路下使用用戶設備端干擾消除技術之下行排程策略 Downlink Scheduling Policies in Heterogeneous Networks with User Equipment Side Interference Cancellation |
作者: | Chen-Yu Wei 魏振宇 |
指導教授: | 廖婉君(Wanjiun Liao) |
關鍵字: | 細胞範圍擴大,合作式排程,異質網路,干擾消除,聯合解碼,功率控制,公平比例排程,碼率控制, cell range expansion,cooperative scheduling,heterogeneous network,interference cancellation,joint decoding,network-assisted interference cancellation,power control,proportional fair,rate control, |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | 異質網路是一種能增加無線網路吞吐率的技術。然而在共通道佈建的二層式異質網路中,層間的干擾大幅地減低了它所帶來的好處。由於大細胞基地台傳輸功率較高,在其周遭的微微細胞基地台會受到嚴重的干擾。這種干擾使得微微細胞基地台的資源未被充分利用。因此有像細胞範圍擴大 (cell range expansion) 與增強式細胞間干擾消除 (enhanced inter-cell interference cancellation) 等網路端的解決方案被提出,並且在第三代合作夥伴計畫 (3GPP) 的第八至十一版本中被標準化。 本研究中考慮了在用戶設備端消除這種強干擾的方法。相對於傳統將干擾視為噪訊 (interference as noise) 之解碼技術,這需要使用聯合解碼 (joint decoding) 來完成。然而若沒有網路端的合作式排程及碼率控制,聯合解碼無法將它的潛能發揮得淋漓盡致。 我們提出了三種在異質網路下的合作式排程方法及大細胞基地台之碼率與功率控制機制。這三種方法不同之處在於它們的計算複雜度、回程線路 (backhaul) 控制訊號量,以及對延遲之要求。藉由控制大細胞基地台的傳輸碼率及功率,那些被嚴重干擾的微微細胞用戶設備或者能夠更好地消除干擾,或者能夠感受到較低的未消除干擾功率。我們的模擬結果顯示,藉由這些排程方法,網路吞吐量能夠大幅增加,尤其對於那些較靠近大細胞基地台的微微細胞基地台而言。 Heterogeneous network (HetNet) is a promising technique in improving the network throughput. In co-channel deployed two-tier HetNets, however, the inter-tier interference largely limits the benefit. Since macrocell base stations often transmit with high power, the nearby picocell base stations suffer from severe interference. This interference problem makes picocells underutilized. Therefore, network-side solutions like cell range expansion (CRE) together with enhanced inter-cell interference coordination (eICIC) are proposed and standardized in 3GPP Release 8-11. In this work, we consider the approach to cancel the strong interference on the user equipment (UE) side. This is done by joint decoding as opposed to the traditional decoding method which treats interference as noise. However, without network-side cooperative scheduling and rate coordination, the potential of joint decoding cannot be exploited. We propose three cooperative scheduling methods together with macrocell rate and power control mechanisms for HetNets. These three methods differ in their computational complexity, backhaul signaling amount, and delay requirement. Through controlling the transmission rate and power of macrocells, those highly interfered picocell edge UEs can either have better chance to cancel the interference, or suffer from less un-cancelled interference. Our simulation shows that with the proposed methods, the total network throughput is improved, especially for those picocells nearer to macrocell base stations. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52351 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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