Mobile Satellite Service System Research Articles

Enabling LTE Services Under Interference from Mobile Satellite Service System

In order to meet the ever-increasing demand for the throughput of 5G mobile communications, more and more frequency bands are defined for the LTE system. However, some parts of the bands have been used by satellite services. When an LTE system in one country is within the footprint of a satellite service owned by another country, to prevent the interference from the satellite services, the LTE system will avoid using the overlapped frequency bands. In order to make use of the overlapped LTE bands, a Downlink Only Frame Structure (DOFS) approach is proposed in this paper. It treats the interfered band as a secondary carrier of a licensed primary carrier and employs a standard frame structure to transmit only downlink traffic on the band. The feasibility of the proposed DOFS approach is evaluated by both considering practical implementation parameters and using a popular commercial simulation tool at an interfered spot. The results reveal that, for most part of the evaluated zone, the SINR is good enough for 64QAM modulation.

Special issue on ‘integrated mobile satellite service systems and technologies’ ‐ guest editorial message

Special issue on ‘integrated mobile satellite service systems and technologies’ ‐ guest editorial message

Analysis of interference and availability between satellite and ground components in an integrated mobile‐satellite service system

SummaryAn integrated mobile‐satellite service (MSS) system is one of the most promising infrastructures for the efficient use of satellite frequency, and the satellite coverage can be extended by reusing the satellite frequency in its ground components. However, the co‐channel interferences caused by the frequency reusing technique may lead to the performance degradation. This paper presents the interference analysis for an integrated MSS system that is composed of a multi‐beam satellite, complementary ground components (CGCs), and mobile earth stations, by using statistical simulations. These statistical results are then used to evaluate the availability of the system. Our simulation results reveal that the satellite frequency reuse in the CGCs of the integrated MSS system can increase efficiency of satellite spectrum utilization with a tradeoff between CGC network capacity and intra‐system interferences. Copyright © 2015 John Wiley & Sons, Ltd.

Coexistence studies on the interference performance between mobile satellite system and LTE network

The interference coexistence performance between the systems of a Long Term Evolution (LTE) network and Mobile Satellite Service (MSS) system, both of which work around the frequency of approximately 2 GHz according to the bandwidth allocation in China, is proposed in this article. The related background of an MSS system and the common terminologies are introduced. Further, the coexistence scenarios of different coverage situations shared by the two systems are discussed. The interference impact of an MSS transmission on an LTE system is evaluated using a specific Monte Carlo method. Finally, simulation results show that although no crucial issues for the coexistence of an LTE downlink and the MSS are observed, the LTE uplink suffers a considerable amount of interference from the MSS transmission. Given the insufficient isolation between LTE and MSS existing networks, and the rapid advance in the field of LTE, problems may emerge in the near future. Further, this article can be of significance in providing reference for frequency spectrum planning in the existing LTE networks.

Feasibility of Coexistence of Mobile-Satellite Service and Mobile Service in Cofrequency Bands

Interference scenarios and methodologies between a terrestrial mobile service (MS) system and mobile-satellite service (MSS) system in a co-channel environment are established. Taking into account a practical deployment situation for both systems, we perform computational simulation of interference in terms of carrier-to-interference ratio (C/I) and interference-to-noise ratio (I/N) to evaluate the cofrequency interference from an MS system into an MSS system, and from an MSS system into an MS system, respectively. The methodology and results can be used as a guide when planning the deployment of MSS and MS systems with no unacceptable interference impact between them.

Evaluation of Co-Frequency Interference with IMT System Caused by Mobile-Satellite Service System

Interference scenarios involving and a methodology for a terrestrial international mobile telecommunication(IMT) system and mobile-satellite service(MSS) system in a co-channel environment are established. Taking into account a practical deployment situation for both systems, a computational simulation of interference in terms of the ratio of interference power to thermal noise(I/N) is performed in order to evaluate the co-frequency interference with the IMT system caused by the MSS system. The methodology and results could be used for planning an IMT deployment without an unacceptable interference impact caused by the MSS system.

Coexistence of mobile-satellite service system with mobile service system in shared frequency bands

Interference scenarios and a methodology between mobile-satellite service (MSS) system and terrestrial mobile service (MS) system in a co-frequency environment are established. Taking into account a practical deployment situation for both systems, computational simulation of interference in terms of the percentage increase in equivalent satellite link noise temperature (DeltaT/T) and the ratio of carrier power to interference power (C/I) is performed to evaluate the co-frequency interference from the MS system into the MSS system. The methodology and results could be used for planning an MSS deployment without an unacceptable interference impact from MS.

A model for interference studies relating to multisatellite non‐geostationary systems in the mobile satellite service

AbstractAn option being considered by current and prospective mobile satellite service (MSS) operators is the use of constellations of non‐geostationary orbit (NGSO) satellites to provide global personal communications. The scarcity of free spectrum, together with the bandwidth typically required, means that any new MSS system must consider sharing spectrum with other systems and services. Spectrum sharing must be based on defined interference criteria being satisfied. When multiple NGSO satellites are considered there is no accepted method for assessing interference. This paper describes a model used as the basis for a computer simulation of interference scenarios involving MSS, fixed service (FS) and fixed satellite service (FSS) systems. The simulation includes NGSO dynamics, constellations of MSS satellites with multi‐spot antennas, multiple geostationary FSS satellites and multiple hop FS links. Interference events are based on C/I calculations, and statistics, such as the percentage of time that the C/I falls below a required protection ratio, are calculated. More generally C/I cumulative distribution functions are produced.