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To reduce energy waste in future cellular networks, the most effective and reliable method is to close idle base stations when not needed, but how to find the proper and optimal method to control the target cell and the adjacent ones are still blank according to recent researches. In this work, we extend our research in cooperative scheme, and figure out a heuristic control method of eNodeBs in GREEN...
Study on energy consumption in wireless systems becomes attractive recently. The worldwide organization 3GPP has established a series of standards to help reduce energy consumption in wireless systems. However, the utilization of green related techniques is still in theoretical way. To reduce energy consumption in cellular networks, the effective and common method is to shut down idle base stations...
Energy waste problems have become critical in modern industry society. In wireless communication systems, there are many possible improvements to reduce electricity consumption, which is effective to reduce energy waste. Traditional on-off scheme is proved to be effective to reduce energy consumption, but such operations are restricted by system parameters and assumptions, e.g. the non-ideal distribution...
Energy consumption problem in mobile personal communications recently becomes popular. Generally, the design and construction of mobile networks are appropriate for peak data traffic, so at leisure time and regions, base station resources will be wasted. Previous researches always tried to reduce the energy consumption of base stations, which takes up about 60% of the total consumption in WCDMA networks...
Due to the demand of higher throughput and lower latency of mobile users, network operators have established more and more service nodes to fulfill the needs. However, the constructions of service nodes lead to another problem of energy waste in some time intervals and regions. Aimed at the tendency of deploying heterogeneous networks, how to make full use of every access point and reduce energy consumption...
Energy consumption in current cellular communication systems becomes more and more critical with the demand for higher throughput and explosive growth of terminal equipment. However, the consumption is evitable in low traffic load time or area, e.g. in late-night. In order to reduce system energy consumption, power off low load base stations is an easy and effective way to reduce energy consumption,...
Energy consumption problem gradually becomes serious with rapid demand of higher throughput and more reliable QoS. The operation that shut down idle base stations is effective to reduce network energy consumption as a conclusion. However, the shut down operation will cause the problem of losing coverage of system users. In order to maintain coverage after shut down base stations, operations of adjacent...
With the rapid development of wireless personal communications, demand for higher rates and bandwidth becomes more and more significant. In order to satisfy the need, network providers tried to deploy more and more access points such as the RRHs, which can effectively increase spectrum efficiency and ensure reliable QoS to users. In fact, demand for resources in uplink and downlink is not equal in...
In order to achieve higher data rates and more reliable QoS, coordinated multipoint transmission/ reception (CoMP) is raised in 3GPP release 10 and beyond. Cooperative transmission can effectively improve the performance of cell-edge users with the cost of exchange load between service eNodeB and cooperative eNodeB. Previous work of 3GPP release 11 has noticed the modeling of cooperative backhaul...
With the rapid development process of LTE-Advanced standardization, 8 × 8 and even higher transmission mode are proposed to support higher transmission rate and flexible transmission scheme. However, transmission environment for mobile communications is complicated and diversified, that means the spatial gain will not always increase with the increase of antenna numbers. How to make full use of spatial...
Recently, the standardization of LTE-Advanced is in rapid process and more and more people concentrate on the system performance of special transmission scenarios and make improvement in current architectures because studies on both system throughput and capacity in physical layer are nearly saturated. The standardization of 3GPP LTE-Advanced release 11 has been opened in the early 2011 and Distributed...
In Release 11 of the LTE-Advanced specification, 8×8 transmission mode is raised to support higher transmission rate. But due to different channel conditions, spatial gain will not always increase with the increasement of antennas. How to make full use of spatial resources is a problem in LTE related areas. In this paper, an adaptive substream selection method is given which is used in 8 × 8 MIMO...
Limited spectrum resource restricts the concerned performance such as spectrum efficiency, data rate and system capacity in wireless communications. To address above issues and explore potential higher frequency spectrum together, we propose a cross-band cooperation architecture in this paper. Then, we apply this architecture to some typical user cooperation scenarios: intra-cell and inter-cell cooperation,...
Coordinated multipoint transmission/reception (CoMP) is widely used to increase the cell-edge user performance in 3GPP LTE and its related workgroups. However, the standardization of CoMP has been freezed in around 2009 and researches on CoMP HARQ process have not come to any conclusions. In this paper, we studied the Single-User (SU) CoMP downlink Hybrid-ARQ (HARQ) process in non-coherent CoMP mode,...
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