Abstract
In this paper, we present two spectrum sharing techniques for a multisystem, incorporating an integrated satellite-mobile system and an autonomous terrestrial-mobile system (iSMS/aTMS), namely orthogonal spectrum sharing (OSS) and non-orthogonal spectrum sharing (nOSS) techniques. aTMS consists of numerous small cells deployed in several buildings, and iSMS consists of a satellite station integrated with complementary ground component (CGC) stations deployed within buildings. By exploiting the high external wall penetration loss of a building, the iSMS spectrum is shared with small cells per building in OSS, and small cells per 3-dimensional (3D) cluster per building in nOSS. An interference management scheme, to avoid interference in apartments with collocated CGC stations and small cells, was developed and an optimal number of almost blank subframes (ABSs) per ABS pattern period (APP) was defined. System-level capacity, spectral efficiency, and energy efficiency performance metrics were derived. Furthermore, we present an algorithm for both OSS and nOSS techniques. With extensive simulation and numerical analysis, it is shown that the proposed nOSS significantly outperforms OSS in terms of spectral efficiency and energy efficiency, and both techniques can meet the expected spectral efficiency and energy efficiency requirements for the fifth-generation (5G) mobile networks.
Highlights
We considered an ideal scenario for the mobility of satellite spot-beams so that there was no impact of the type of satellite spot-beam cells on the capacity of autonomous terrestrial-mobile system (aTMS)
We presented two spectrum sharing techniques, namely orthogonal spectrum sharing (OSS) and non-orthogonal spectrum sharing, for a multisystem consisting of an integrated satellite-mobile system and an autonomous terrestrial-mobile system
We developed an interference management strategy to avoid co-channel interference and deduced an optimal number of almost blank subframes (ABSs) per ABS pattern period (APP) to ensure a fair allocation of time resources in apartments with collocated complementary ground component (CGC) stations and small cells
Summary
Spectrum sharing between space-satellite systems (SPSs) and terrestrial-mobile systems (TMSs) is considered as a crucial and viable option, for the future fifth-generation (5G) mobile system. With this consideration, many countries such as Japan have allocated 5G spectra to four mobile network operators including 3.7 GHz, 4.5 GHz, and 28 GHz [1]. Along with serving a high indoor data traffic demand with the shared satellite spectrums, both the system-level spectral efficiency and energy efficiency of a mobile system can be improved, which necessitate developing techniques to share the spectrum of a satellite system with the in-building small cells of a mobile system
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