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The overlaid cell structure, in which a large number of small cells are deployed in a macro-cell coverage area, is considered to be a promising approach in order to accommodate rapidly increasing mobile data traffic. In the overlaid cell structure, eICIC (enhanced Inter-Cell Interference Coordination) is an essential technique to avoid the interference between the macro cells and the small cells when...
In deploying co-channel heterogeneous networks, which use the same frequency band for both macro and small cells, it is essential to avoid mutual interference. This can be achieved by enhanced Inter-Cell Interference Coordination (eICIC), in which some of the downlink transmitted signals are muted in order to reduce the interference from a macro-cell base station to small cells or vice versa. Because...
3D cell structure, where small cells are three- dimensionally deployed on macro cells, is considered as one of the effective cell structures to accommodate data traffic growing rapidly in recent years. In this cell structure, inter-cell interference among small cells is one of the major issues. As a technique for mitigating inter-cell interference among small cells, we propose a network coordinated...
The overlaid cell structure, in which a large number of small cells are deployed in a macro-cell coverage area, is attracting much attention recently as a promising approach to cope with rapidly increasing mobile data traffic. In the overlaid cell structure with co-channel deployment, in which the same frequency band is used in both macro and small cells, it is essential to avoid the mutual interference...
The overlaid cell structure, in which a large number of small cells are deployed in a macro-cell coverage area, is considered to be a promising approach in order to accommodate rapidly increasing mobile data traffic. When co-channel deployment is used in the overlaid cell structure, the interference between macro and small cells becomes an issue and it needs to be solved in order to increase system...
The layered cell structure, in which a large number of small cells overlay each macro cell to increase network capacity is attracting much attention. In the layered cell structure, eICIC is essential to avoid the interference between the macro cells and the small cells when co-channel deployment is used. Because eICIC conducts interference coordination in the time domain, accurate timing synchronization...
3D cell structure, where small cells are threedimensionally deployed on macro cells, is considered as one of the effective cell structures to accommodate data traffic growing rapidly in recent years. In this cell structure, inter-cell interference among small cells is one of the major issues. As a technique for mitigating inter-cell interference among small cells, we propose a network coordinated...
Most current cellular mobile communication systems employ 1-cell frequency reuse to achieve high spectrum efficiency. With 1-cell frequency reuse, the co-channel interference among cells remains a critical barrier to achieving further improvements in the spectrum efficiency. Vertical plane beam control at the base station is one approach to mitigating the co-channel interference. The conventional...
Most current cellular mobile communication systems employ 1-cell frequency reuse to achieve high spectrum efficiency. With 1-cell frequency reuse, the co-channel interference among cells remains as a critical barrier to achieving further improvement in the spectrum efficiency. Vertical plane beam control at base station is one approach to mitigating the co-channel interference. As a conventional method...
Most current cellular mobile communication systems employ 1-cell frequency reuse to achieve high spectrum efficiency. With 1-cell frequency reuse, the co-channel interference among cells remains as a critical barrier to achieving further improvement in the spectrum efficiency. Vertical plane beam control at base station is one approach to mitigating the co-channel interference. As a conventional method...
Multiple base station cooperation techniques have been attracting much attention for the improvement in cell-edge throughput recently. In 3GPP, such techniques are referred to as CoMP and studied actively. Joint transmission is a promising technique in CoMP. In CoMP JT, previous studies have mainly focused on intra-eNB CoMP because it is relatively easy to implement. The intra-eNB CoMP JT in combination...
The multiple base station cooperation approach has been attracting much attention recently. In 3GPP, this approach is referred to as CoMP. The promising techniques in CoMP are joint transmission and dynamic cell selection. They improve cell-edge UE throughput through the cooperation of eNBs, however, the signal-processing burden or the technical difficulties to realize the accurate synchronous transmission...
Inter-cell interference coordination (ICIC) is attracting attention recently. In ICIC, mutual interference among cells are coordinated to mitigate strong interference to UEs, while the exchange of data signal is not necessary among eNBs, which results in lower signal processing and networking burdens compared to coordinated multi-point (CoMP) transmission. In ICIC, the interference from an eNB to...
Inter-Cell Interference Coordination (ICIC) is attracting attention recently. In ICIC, cell-edge throughput can be improved by preventing BSs from transmitting signals (hereafter, muting BSs), and the information exchange among BSs is little because each UE is only served by a BS at any instant. However, when a BS is muted, no radio resource is allocated to UEs belonging to the muted BS while UEs...
Inter-cell interference coordination (ICIC) is attracting attention recently. This is a technique mainly improving cell-edge throughput by coordinating scheduling and signal transmission of multiple BSs. Different from joint transmission (JT), in which the desired signals for a user equipment (UE) are simultaneously transmitted from multiple BSs, the burdens of information exchange among BSs and its...
CoMP (Coordinated Multiple Point transmission) is being discussed in 3GPP (3rd Generation Partnership Project) to improve the cell edge performance as well as the total cell throughput of mobile systems. In this paper, we focus on the control architecture to realize downlink CoMP JT (joint transmission) with inter eNB (evolved NodeB) coordination. We have designed the control architecture with a distributed...
Multi-cell cooperative transmission is attracting much attention. This technology improves the cell-edge throughput since multiple base stations cooperate with each other in transmitting signals to the cell-edge user. One basic implementation of multi-cell cooperative transmission is inter-sector cooperation, in which a base station with three sectors uses its own equipment to realize multi-cell cooperative...
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