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Deployment of small cells is one of the most efficient solutions to improve the energy efficiency in mobile communication networks. However, small cell topology has a disadvantage such as frequent handovers of mobile user equipments (UEs). To solve this handover problem for small-cell users in a HetNet environment, we propose a novel handover scheme utilizing a cooperation-based cell clustering scheme...
In heterogeneous networks (HetNets), small cells are overlaid within a large cell in order to increase capacity and coverage beyond the initial deployment of a large cell. Previous studies assumed that small cells are deployed only in the cell edge area of a large cell to support low-SINR users in that area. However, in a future communication environment, we need more small-cells to support much higher...
In order to reduce the power consumption of cellular base stations (BSs), the following BS architectures have been developed: micro cell BSs, and remote radio head (RRH)-based BSs. In this paper, we propose a novel BS power consumption model for comparing the power consumption and energy efficiency of above three different BS architectures. The RRH-based BS architecture outperforms the conventional...
In order to alleviate a mobile data explosion problem, WiFi offloading has been proposed. The key issue is how many access points (APs) are needed to accommodate a proper number of users per WiFi AP without severe performance degradation. Although WiFi networks can provide higher throughput as more and more APs are deployed, it may not be a reasonable solution if we consider an increase in the corresponding...
Energy efficiency in wireless communication systems has recently attracted great interest. Small-sized cell topology is a key idea for energy saving. In this letter, we characterize the scaling laws of energy efficiency related metrics such as base station (BS) transmit power, capacity per user, and energy efficiency per user for varying cell radii in downlink cellular networks by investigating the...
In this paper, we propose a mobile grouping procedure to cooperate, and propose three different cost metrics for grouping: the remaining battery energy, WLAN physical (PHY) data-rate, and the number of MSs in the expected cooperation group. Moreover, we propose three cooperative MS-grouping schemes based on the above three metrics in order to extend the battery lifetime of MSs with both WLAN and Bluetooth...
Most wireless networks adopt power saving mechanisms in order to extend the battery lifetime of mobile devices. In this paper, we investigate the performance of a power saving mechanism in IEEE 802.16m by using a simulator which models the sleep mode operation with a flexible length of listening window specified in IEEE 802.16m standard. Through simulations, we evaluate the proportion of listening...
Future mobile communication systems demand much higher data rates which may require significantly more energy consumption, compared with the current 3G systems. Recently, green radio has attracted worldwide attention. Energy efficiency is considered as a very important factor for designing future communication systems in this green radio environment because reducing energy consumption of base stations...
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