RESOURCE DIMENSIONING OF BROADBAND SATELLITE RETURN NETWORKS AFFECTED BY RAIN FADE

The use of Ka-band in satellite links has made rain attenuation a major concern in satellite network design. Fade mitigation techniques come at the expense of higher satellite resource consumption, such as bandwidth and power. An accurate estimation of this consumption is essential for the satellite service providers' business case, product strategy, and overall service pricing. However, the spatial correlation of rain fade introduces a high level of model complexity, and no method is currently available to compute its impact on resource consumption. Focusing on the return link of satellite broadband networks, this dissertation proposes a satellite resource dimensioning process that accounts for such a correlation in several scenarios, depending on the network's adaptability to rain fade. Firstly, we investigate nonadaptive network scenarios and answer the following question: how can the long-term bandwidth requirement of the network be minimized, given a set of ground terminals, modulations and codings, and discrete bandwidths? We formally define the long-term carrier allocation problem and analyze current practical solutions. We subsequently investigate two other potential solutions, found to be more bandwidth-efficient: one based on heuristics and another based on mixed integer linear programming. Finally, we look at the impact of several parameters on the performance of those three methods. Overall, we observe marginal reductions in bandwidth, however, significant (>10%) gains are reached for networks with small return links with low committed information rates. Secondly, we investigate semi-adaptive network scenarios with the introduction of adaptive coding and modulation. However, these technologies come at the cost of higher complexity when designing the network's carrier plan and user terminals. Taking into account those issues is even more important when the satellite link uses frequencies in Ka-band and above, where rain attenuation is a major concern. To consider such phenomena, we reformulate the previously presented solutions to factor in spatially correlated attenuation time series, in the form of a mixed integer linear programming optimization problem. The numerical results for a test scenario in Europe show significant bandwidth improvements. Lastly, we investigate fully-adaptive network scenarios and introduce multibeam aspects. We formulate a quantile estimation problem based on the broadband service level agreements. Then, we solve this problem for a given confidence relative interval using spatially correlated rain fade sample generators. Finally, we provide numerical results for residential and enterprise broadband satellite scenarios, allowing us to determine the underestimation and overestimation of satellite resource consumption made by optimistic (independent) and pessimistic (fully correlated) rain fade assumptions, respectively. Results show that for both assumptions, the satellite resource consumption can be significantly underestimated or overestimated, thus proving the importance of considering the spatial correlation of rain fade in the satellite resource dimensioning problem.Resource dimensioning of broadband satellite return networks affected by rain fade9. Industry, innovation and infrastructur

Proceedings of the Fifth International Mobile Satellite Conference 1997

Satellite-based mobile communications systems provide voice and data communications to users over a vast geographic area. The users may communicate via mobile or hand-held terminals, which may also provide access to terrestrial communications services. While previous International Mobile Satellite Conferences have concentrated on technical advances and the increasing worldwide commercial activities, this conference focuses on the next generation of mobile satellite services. The approximately 80 papers included here cover sessions in the following areas: networking and protocols; code division multiple access technologies; demand, economics and technology issues; current and planned systems; propagation; terminal technology; modulation and coding advances; spacecraft technology; advanced systems; and applications and experiments

Propagation forecasting for EHF and SHF systems

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Efficient Management of Multicast Traffic in Directional mmWave Networks

Multicasting is becoming more and more important in the Internet of Things (IoT) and wearable applications (e.g., high definition video streaming, virtual reality gaming, public safety, among others) that require high bandwidth efficiency and low energy consumption. In this regard, millimeter wave (mmWave) communications can play a crucial role to efficiently disseminate large volumes of data as well as to enhance the throughput gain in fifth-generation (5G) and beyond networks. There are, however, challenges to face in view of providing multicast services with high data rates under the conditions of short propagation range caused by high path loss at mmWave frequencies. Indeed, the strong directionality required at extremely high frequency bands excludes the possibility of serving all multicast users via a single transmission. Therefore, multicasting in directional systems consists of a sequence of beamformed transmissions to serve all multicast group members, subgroup by subgroup. This paper focuses on multicast data transmission optimization in terms of throughput and, hence, of the energy efficiency of resource-constrained devices such as wearables, running their resource-hungry applications. In particular, we provide a means to perform the beam switching and propose a radio resource management (RRM) policy that can determine the number and width of the beams required to deliver the multicast content to all interested users. Achieved simulation results show that the proposed RRM policy significantly improves network throughput with respect to benchmark approaches. It also achieves a high gain in energy efficiency over unicast and multicast with fixed predefined beams.acceptedVersionPeer reviewe

Satellite Communications

This study is motivated by the need to give the reader a broad view of the developments, key concepts, and technologies related to information society evolution, with a focus on the wireless communications and geoinformation technologies and their role in the environment. Giving perspective, it aims at assisting people active in the industry, the public sector, and Earth science fields as well, by providing a base for their continued work and thinking

Efficient Management of Multicast Traffic in Directional mmWave Networks

Multicasting is becoming more and more important in the Internet of Things (IoT) and wearable applications (e.g., high definition video streaming, virtual reality gaming, public safety, among others) that require high bandwidth efficiency and low energy consumption. In this regard, millimeter wave (mmWave) communications can play a crucial role to efficiently disseminate large volumes of data as well as to enhance the throughput gain in fifth-generation (5G) and beyond networks. There are, however, challenges to face in view of providing multicast services with high data rates under the conditions of short propagation range caused by high path loss at mmWave frequencies. Indeed, the strong directionality required at extremely high frequency bands excludes the possibility of serving all multicast users via a single transmission. Therefore, multicasting in directional systems consists of a sequence of beamformed transmissions to serve all multicast group members, subgroup by subgroup. This paper focuses on multicast data transmission optimization in terms of throughput and, hence, of the energy efficiency of resource-constrained devices such as wearables, running their resource-hungry applications. In particular, we provide a means to perform the beam switching and propose a radio resource management (RRM) policy that can determine the number and width of the beams required to deliver the multicast content to all interested users. Achieved simulation results show that the proposed RRM policy significantly improves network throughput with respect to benchmark approaches. It also achieves a high gain in energy efficiency over unicast and multicast with fixed predefined beams.acceptedVersionPeer reviewe

Proceedings of the Third International Mobile Satellite Conference (IMSC 1993)

Satellite-based mobile communications systems provide voice and data communications to users over a vast geographic area. The users may communicate via mobile or hand-held terminals, which may also provide access to terrestrial cellular communications services. While the first and second International Mobile Satellite Conferences (IMSC) mostly concentrated on technical advances, this Third IMSC also focuses on the increasing worldwide commercial activities in Mobile Satellite Services. Because of the large service areas provided by such systems, it is important to consider political and regulatory issues in addition to technical and user requirements issues. Topics covered include: the direct broadcast of audio programming from satellites; spacecraft technology; regulatory and policy considerations; advanced system concepts and analysis; propagation; and user requirements and applications