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Energy Efficient Hybrid Satellite Terrestrial 5G Networks with Software Defined Features
Jiaxin Zhang,Xing Zhang,Muhammad Ali Imran,Barry G. Evans,Yan Zhang,Wenbo Wang 한국통신학회 2017 Journal of communications and networks Vol.19 No.2
In order to improve the manageability and adaptabilityof future 5G wireless networks, the software orchestration mechanism,named software defined networking (SDN) with controland user plane (C/U-plane) decoupling, has become one of themost promising key techniques. Based on these features, the hybridsatellite terrestrial network is expected to support flexibleand customized resource scheduling for both massive machinetype-communication (MTC) and high-quality multimedia requestswhile achieving broader global coverage, larger capacity and lowerpower consumption. In this paper, an end-to-end hybrid satelliteterrestrial network is proposed and the performance metrics, e. g., coverage probability, spectral and energy efficiency (SE andEE), are analysed in both sparse networks and ultra-dense networks. The fundamental relationship between SE and EE is investigated,considering the overhead costs, fronthaul of the gateway(GW), density of small cells (SCs) and multiple quality-ofservice(QoS) requirements. Numerical results show that comparedwith current LTE networks, the hybrid system with C/U split canachieve approximately 40% and 80% EE improvement in sparseand ultra-dense networks respectively, and greatly enhance thecoverage. Various resource management schemes, bandwidth allocationmethods, and on-off approaches are compared, and theapplications of the satellite in future 5G networks with softwaredefined features are proposed.
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