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The aim of mobility management is to track the location of user equipment (UE). Many location management methods have been proposed and they could be classified into several categories: the distance based method, time based method, and movement based method. These methods only consider the mobility of UEs. When the telephonic traffic increases, the performance of these methods may decrease significantly...
Since user equipment (UE) has to obtain the cell identification (cell ID) and timing information to start the communication with base station, cell search is the initial step in cellular systems. The research of 5G has been started to improve the performance of wireless communication. A new scenario named ultra-dense network (UDN) has been introduced and there will be more access nodes per unit area...
Wireless broadcasting systems employ multiple retransmissions to guarantee the correct reception of each packet. Traditional hybrid automatic retransmission request (HARQ) protocol retransmits one packet per slot. Hence, a large amount of retransmissions are required to correctly receive all the packets, which lead to low spectrum efficiency. In this paper, we propose a Max-Degree Network Coding (MDNC)...
Heterogenous networks (HetNets) consisting of both macrocells and small cells are capable of improving system capacity and user throughput significantly. However, the deployment of various small cells may result in frequent handover between the macrocell and small cells, and between small cells, and the possible handover failure (HoF) may severely affect system performance and user quality of service...
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