異質性無線網路之基地台間干擾控制技術

Abstract

在第三代合作夥伴計劃-長期演進技術的環境下，為了提供更高的資料傳輸速率以及提高頻譜使用效率，多基地台間合作式傳輸以及接收技術被視為可以有效地提供效益。在本篇論文中，在異質性無線網路之下，大基地台間以及大基地台範圍內布建的小基地台，都有光纖互相連結傳輸，我們提出在此系統下，可以結合各個大基地台間的合作，以及大基地台跟微小基地台間的合作傳輸技術。 由於要讓各個基地台間合作，在使用者手機端中需要去回饋通道資訊才能完成傳輸並且保持傳輸量，回饋到基地台的資訊會造成當接收完成後，通道情形已經改變，所以我們將這樣的延遲效應考慮進來，去比較延遲對系統效能的影響。在論文中，我們針對結合各種基地台間合作，提出一種可以有效改善頻譜效率的合作式傳輸技術；此外，再將提出的傳輸技術應用到不同的基地台架構下，也找出最適合的這項技術的架構。

Since there are more demands for high data rates, the 3rd Generation Partnership Project (3GPP) has already published many researches and contributions about increasing the spectral efficiency. We have seen a lot of studies on coordinated multipoint transmission and reception techniques for the LTE-A systems. The main perspectives of these approaches aim at mitigating the inter-cell interference and also increasing the system performance. Recently, several coordinated multipoint (CoMP) transmission techniques have already been investigated. This thesis presents a joint cooperation design based on CoMP operations. Our design will combine cooperation between intra-site with remote radio head and inter-site with available backhaul. The gaol of this thesis is to evaluate the improvement by a joint design method and provide a better strategy when combining the cooperation of both sites. Since we try to extend CoMP region from intra-site to inter-site, we have to exchange more channel state information and data between devices. This will increase the feedback time to complete reception. We consider that the delay effect should be included and evaluated. In addition, we will discuss the effects upon the system performance which are caused by different cell architectures. Several CoMP transmission techniques are operated in heterogeneous network. We use different ones in inter-site cooperation to compare the system performance of spectrum efficiency. Compared with other transmission schemes, the proposed scheme is a feasible method to enhance spectral efficiency.