Role Of Satellite Communications Research Articles

Role of Satellite Communications in 5G and Challenges

Role of Satellite Communications in 5G and Challenges

Satellite multi-beam multicast support for an efficient community-based CDN

The design and implementation of an efficient end-to-end IP-based infrastructure for the delivery of multimedia content is of paramount importance in current public networks, dominated by the constant growth of video streaming traffic. Content Delivery Networks (CDNs) represent the main technological solution to manage the huge volumes of traffic involved, by guaranteeing high quality levels to applications and low impact to the core networks, thanks to the efficient distribution of content among edge caches that are located as close as possible to end-users. Nonetheless, the hierarchical data distribution associated with CDNs can be in principle subject to inefficiencies, as well as performance limitations in case of congested segments along the end-to-end delivery path. In this context, we propose the exploitation of satellite multicast capabilities offered by modern high throughput satellite (HTS) platforms, in a virtualized-compatible model, to compensate for flaws of terrestrial networks. The role of satellite communication is to offer multicast support (as a complement to landline connectivity) with wide geographical service areas based on the available satellite beams, enabling a popularity-based content distribution support. In addition, multi-beam satellite technology allows for a more fine-grained approach to popularity evaluation based on user location. The proposed service and the related network configuration are described in the paper, in relation with current and future SatCom platforms. We then present the results of the proposed CDN caching algorithms in a simulated environment, showing promising results associated with a preliminary performance evaluation.

Preliminary analysis of rain attenuation and frequency scaling method for satellite communication

Rain attenuation plays a significant role in satellite communications in the Ka band. The paper studied the rain attenuation using empirical formulations of the prominent models like ITU-R P.618-13, ITU-R P.838-3, Moupfouma, and Garcia Lopez. At a rain rate of 47.6 mm/hr, measured by Indian Meteorological Department for 2018 for Gadanki, near Tirupati, India, the attenuation values were calculated. The measured data, acquired by Ka band digital beacon receiver, is compared with the calculated data at the frequency of 20.2 GHz for both horizontal and vertical polarizations. The value of parameters viz. relative error, root-mean-square error, standard deviation error, and Chi-square error were calculated. Frequency scaling for the frequency of 30.5 GHz was calculated with the help of ITU-R P.618-13 method.

The Role of Satellite Communications in the Smart Grid

The dramatic drop in the price of equipment and services and the increase in efficiency have made satellite communications (SATCOM) an interesting choice for the deployment of major smart grid scenarios. As a matter of fact, SATCOM providers are offering more and more services dedicated to machine-to-machine communications, and they expect actors in the smart grid domain to be among the main users. However, to fruitfully integrate these communication technologies into smart grids, it is of utmost importance to understand the strengths and limits of the available satellite features in light of smart grid communication requirements and recent advancements in the SATCOM arena. Starting with a review of the latest trends in the satellite market for machine-to-machine communications, relevant smart grid requirements are classified and mapped to the most significant smart grid applications. Then, various features and trends of SATCOM are discussed to take stock of their suitability and to outline future challenges for the exploitation of SATCOM systems in smart grids.

Recent Japanese R&D in Satellite Communications

Current trend in telecommunications is “broadband” and “ubiquitous.” To achieve this goal, satellite communications systems are expected to play an important role in cooperation with terrestrial communications systems. Along with the advancement of optical fiber transmission systems, the role of satellite communications was dramatically changed from long distance transmission to various applications utilizing unique features of satellite communications. This paper overviews recent Japanese R&D in satellite communications.

Role of Satellite Communication and Remote Sensing in Rural Development

The advances in Satellite Communication and Remote sensing has led to the development of solutions for various national development programs like National Natural Resource Management (NNRMS), disaster management, tele-education and e-Health care using telemedicine. The advances in sensor technologies and image processing have resulted in sensors with increased spatial, spectral and radiometric resolutions and provide images with rich details for remote sensing applications.India is a vast country with 29 states and 6 union territories with more than 1 billion population, which is predominantly rural and distributed at distant geographical locations apart from the high-density urban areas. Ensuring basic minimum health care to masses living in remote rural areas is a top priority for any government. Tele-medicine using the satellite communication as well as Fiber Optic communications is playing an important role to address health care requirements of people living in remote areas, rural areas, soldiers in battlefields etc. The Image processing techniques and advances in Database management of images and text made it possible to create 3D virtual images of human organs by using imaging techniques from MRI, CT & Ultrasound.The universalisation of education has become the top priority, especially for the developing countries. But the extension of quality education to remote and rural regions becomes a Herculean task for a large country like India with multi-lingual and multi-cultural population separated by vast geographical distances, and, in many instances, inaccessible terrain. Satellites can establish the connectivity between urban educational institutions with adequate infrastructure imparting quality education and the large number of rural and semiurban educational institutions that lack the necessary infrastructure.This paper describes utilization of Satellite Communication and Remote sensing with advanced techniques in providing solutions to areas of primary importance in rural development such as harnessing of natural resources, education and healthcare.

Satellite systems for personal communication networks

The paper addresses some issues related to Satellite Personal Communication Networks (S-PCNs). The role of satellite communications in that scenario is discussed, and some characteristics of S-PCNs are identified. In addition, the problem of the integration of S-PCNs with the Universal Mobile Telecommunication System (UMTS) is considered. In this respect an original methodology for accomplishing such integration is proposed; such methodology aims at avoiding complex protocol conversions at the interfaces between the terrestrial and the satellite segment. The paper is partly based upon the work performed by the authors in the framework of the European Community INSURED Project “INtegrated Satellite UMTS Real Environment Demonstrator”.

Satellite systems for personal communication networks

The paper addresses some issues related to Satellite Personal Communication Networks (S-PCNs). The role of satellite communications in that scenario is discussed, and some characteristics of S-PCNs are identified. In addition, the problem of the integration of S-PCNs with the Universal Mobile Telecommunication System (UMTS) is considered. In this respect an original methodology for accomplishing such integration is proposed; such methodology aims at avoiding complex protocol conversions at the interfaces between the terrestrial and the satellite segment. The paper is partly based upon the work performed by the authors in the framework of the European Community INSURED Project “INtegrated Satellite UMTS Real Environment Demonstrator”.

Hybrid satellite and terrestrial networks

AbstractThe role of satellite communications in networks that provide new services, such as frame relay and multimedia, is investigated. Both passive and active (on‐board switching/processing) satellite systems are considered. Novel techniques are developed for each system to demonstrate, via detailed analysis and simulation, how the communications bandwidth agility of multipoint/broadcast satellite channels, and the on‐board switching/processing, makes it feasible to provide these new services via hybrid satellite and terrestrial networks in a resource‐efficient manner.

The Role of Satellite Communications in National Development: Future Trends

This paper firstly describes the progress of satellite technologies and services, the development of the Asia-Pacific region and the role of satellite communication in national development. Then, the author briefly discusses the role of satellite communications in the development of Indonesia. Finally, he highlights the future trends in satellite technology and its use.

The role of satellite communication in the ISDN era

AbstractSatellite communications can play an important role in provisioning the next‐generation telecommunications services and networks, provided that the protocols specifying these services and networks are satellite‐compatible. After a brief discussion of narrowband circuit and packet mode integrated service digital network (ISDN) services, the paper focuses on emerging standards in frame relay, broadband ISDN (BISDN) and universal personal telecommunications (UPT). The specific parameters and procedures of frame relay and BISDN protocols which are affected by a satellite delay are identified, and congestion and resource management functions for frame relay and BISDN are discussed in detail. Specific ground functions and possible on‐board functions are identified as potential candidates for implementation via neural network technology. Finally, the implication of UPT standards on satellite networks is discussed.

Role of Earth Stations in Clock Synchronization via Satellite

Several techniques exist by which one can transfer instant of time or epoch from one place to another.This paper deals with the role of earth stations in synchronizing clocks via satellite. Attempts were made to synchronize distant clocks located at Ahmedabad, Delhi and Madras via symphonie satellite, during STEP experiment. Later on, similar experiment was conducted between Delhi Earth Station and Raisting Earth Station (West Germany).Earth Stations play a very important role in Satellite communications. In this paper, an attempt has been made to highlight the parametres involved to get the best possible synchronization of distant clocks with an ideal system and band-limited system.Finally, experience gained during these experiments and further prospects with APPLE and INSAT Satellite are highlighted.

NASA's revitalized role in satellite communications

The early efforts of NASA in space communications development strengthened the general level of confi. dence in the use of satellite technology for telecommunications. Soon afterward, the formation of organizations such as INTELSAT and the Comsat Corporation and their subsequent progress brought reliable communications via satellite at affordable rates. These capabilities have grown worldwide through new industries that are fostering the principles of the 1958 Space Act to exploit the peaceful benefits of space for the betterment of mankind. As a result of this recognized success arid the pressures of budget cutting, NASA's role in this pioneering effort was slowed in 1973. The flight projects then under development, the Applications Technology Satellite Six (ATS-6) and the Communications Technology Satellite (CTS) were allowed to continue but the research projects were reduced to a small ground-based effort directed toward long-term high-risk components and techniques. Now, as we enter the 1980's, the situation is reversed. The principal NASA spacecrafts are retired, but the program for research and development and flight experiments is revived.

The future impact of telecommunications on information science

A brief review is first made of present telecommunication methods as used in today's information systems. Limitations are outlined and explained. An ideal system as it might be conceived now is postulated, compared with present technol ogy and with what will probably be available within the next ten years. Increasing role of satellite communications is emphasised. It is suggested that one of today's obstacles to worldwide systems, i.e. acceptance of standards, will no longer remain a problem, and the multistandard systems will be common. All speeds up to 9.6 Kbit/s will be used in some wideband transmission at 1 to 2 Mbit/s will not be unusual. By the end of the first year period, the hardware in use for the various component elements of the total system will have fundamentally changed and improved almost beyond recognition. A new leap-frogging process will follow in the techniques of transmission. Satellite systems will be in wide- scale use and optical fibre technology will already be replac ing standard transmission lines on a fairly large scale. By the year 2001, obsolescence of most of today's transmission equipment will have ensured almost total replacement, and noise problems will virtually have disappeared. Newspapers will also probably disappear at the same time, and contrary to Orwell's 1984 predictions, the era of the total information society will be in full swing.