VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2024-03-29T13:51:03ZEPrintshttp://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/2017-11-15T01:59:53Z2017-12-12T08:24:05Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2654This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26542017-11-15T01:59:53ZChannel Reallocation for Reducing Power Consumption in Femtocell Mobile NetworksFuture mobile networks are known to deploy a two-tier architecture of macrocell – femtocell [1]. In the two-tier architecture, femtocell downlink channels can cause strong co-channel interference to downlink transmission of macrocell users (MUs) which use the same frequency. The co-channel downlink interference to the MU might cause the MU’s QoS degradation. To maintain the QoS of the MU’s connection, the serving macro base station (MBS) has to increase the transmission power of the macrocell downlink. The power increment will also cause more co-channel interference to other MUs of the neighbor MBSs thus results in increasing downlink transmission power of the macrocell subsystem. In this paper, we analyze the co-channel downlink interference and then propose downlink channel reallocation schemes, denoted as MBS-sensing and CFAP-sensing schemes, in order to reduce the power consumption of the macrocell subsystem. Simulation results prove that using channel reallocation schemes provide much better downlink power consumption efficiency than the case when the channel reallocation is not deployed. In general, the CFAP-sensing scheme has better performance than the MBS-sensing scheme. However, when femtocells have long coverage radius, the MBS-sensing scheme is the better solution because it is less complex and has similar performance.Xuan Bac Nguyenngxbac.dt@gmail.comNam Hoang Nguyenhoangnn@vnu.edu.vnTakahiko Sabasaba@cs.it-chiba.ac.jp2017-11-13T12:37:31Z2017-12-13T01:58:21Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2631This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/26312017-11-13T12:37:31ZFemtocell Selection Scheme for Reducing Unnecessary Handover and Enhancing Downlink QoS in Cognitive Femtocell NetworksFemtocell networks have been proposed for
indoor communications as the extension of cellular networks
for enhancing coverage performance. Because femtocells have
small coverage radius, typically from 15 to 30 meters, a
femtocell user (FU) walking at low speed can still make
several femtocell-to-femtocell handovers during its connection.
When performing a femtocell-to-femtocell handover, femtocell
selection used to select the target handover femtocell has to
be able not only to reduce unnecessary handovers and but
also to support FU’s quality of service (QoS). In the paper,
we propose a femtocell selection scheme for femtocell-tofemtocell handover, named Mobility Prediction and Capacity
Estimation based scheme (MPCE-based scheme), which has
the advantages of the mobility prediction and femtocell’s
available capacity estimation methods. Performance results
obtained by computer simulation show that the proposed
MPCE-based scheme can reduce unnecessary femtocell-tofemtocell handovers, maintain low data delay and improve
the throughput of femtocell users.Dong Hoang Nhuddonghoang93@gmail.comHoang Nguyen Namhoangnn@vnu.edu.vnMinh Hoang Tronghoangtrongminh@yahoo.comTakahiko Sabasaba@cs.it-chiba.ac.jp