A satellite mobile system integrated with the terrestrial cellular network (original) (raw)
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Integration of mobile satellite and cellular systems
By integrating the ground based infrastructure component of a mobile satellite system with the infrastructure systems of terrestrial 800 MHz cellular service providers, a seamless network of universal coverage can be established. Users equipped for both cellular and satellite service can take advantage of a number of features made possible by such integration, including seamless handoff and universal roaming. To provide maximum benefit at lowest posible cost, the means by which these systems are integrated must be carefully considered. Mobile satellite hub stations must be configured to efficiently interface with cellular Mobile Telephone Switching Offices (MTSO's), and cost effective mobile units that provide both cellular and satellite capability must be developed.
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International Journal of Satellite Communications, 1996
Terrestrial cellular networks and mobile satellite systems are expected to converge towards a future integrated satellite/terrestrial mobile communication network. Besides a system globalization, the integration of terrestrial and satellite mobile systems will lead to the unloading of the fixed part of the mobile network. This paper proposes an integrated satellite/terrestrial mobile communication system and evaluates its performance in terms of the blocking probability for new call attempts, the call dropping probability and the probability of unsuccessful call. This communication system was simulated and its performence compared with that of a stand-alone terrestrial mobile system. In the terrestrial part of the system we have considered fixed channel allocation (FCA) and dynamic channel allocation (DCA) techniques. Satellite channels can have equal or lower priority compared to terrestrial channels. The improvement of the system performance by means of satellite-to-terrestrial handovers was also estimated.
The GSM procedures in an integrated cellular/satellite system
Selected Areas in Communications, …, 1995
In an integrated cellular/satellite system for mobile communications a satellite subsystem cooperates with a terrestrial cellular network for providing user services. The paper addresses the problems related of the reuse of the procedures of the GSM cellular standard in an integrated system, allowing at most changes only at the mobile terminal and/or in the satellite network. The results of the study show that most of the GSM procedures can be reused in an integrated system (in a few cases with limited protocol variations) but some others would require modifications to the cellular network. The results of this study shall also be useful for the suitable definition of the protocols of an integrated satelliteherrestrial system for the next generation of mobile and personal communication services.
13th International Communication Satellite Systems Conference and Exhibit
The current scenario in Europe is of a well defined Pan European digital cellular system together with several proposals for land-mobile satellite systems.The integration of a satellite system with the terrestrial system has obvious advantages.This paper investigates the possible synergy of a land mobile satellite system with the Pan European terrestrial digital cellular system.A possible integrated system architecture using the main functional blocks of the terrestrial system is proposed.Alternative satellite systems have been examined and a likely implementation scenario. based on the foreseeable development in the region,has been suggested.
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The future trends of technologies are to achieve all systems in an integrated global one that offers all the services in a simple way. The proposed mobile communications over satellite is an advanced technology that used the facilities and benefits of both systems to achieve competitive services. The proposed system concentrated on a global system that served the entire world and gives some specialization and privacy for each country. This paper attempts to show how to implement mobile communications over satellite systems in an efficient, flexible, and cost-effective manner.
Network design consideration of a satellite-based mobile communications system
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The concept o f mobile communications via a geosynchronous satellite has been proposed in recent years. Twelve companies have filed applications with the Federal Communications Commission to offer nationwide Mobile Satellite Services (MSS). Chis paper addresses several technical issues related to MSS from the network design point o f view. MSAT-X, which stands for the Mobile Satellite Experiment, is the task assigned to the Jet Propulsion Laboratory by the United States National Aeronautics and Space Administration to develop low-cost, spectral-efficient, satellite-based mobile communications technologies for 1990's. A1 though the discussions and recommendations presented in this paper are 1 imi ted to MSAT-X, technologles developed under MSAT-X may be o f the utmost importance to the first generation MSS. with the National Aeronautics and Space Administration.
A Survey on Mobile Satellite Systems
International Journal of Satellite Communications and Networking, 2010
Satellite systems represent a significant solution to provide communication services to mobile users in under-populated regions, in emergency areas, on planes, trains, and ships. In all these cases, satellite systems have unique capabilities in terms of robustness, wide area coverage, and broadcast/multicast capabilities. This paper surveys current mobile satellite networks and services from different standpoints, encompassing research issues, recent standardization advances (e.g. mobile extension for DVB-S2/-RCS, DVB-SH) and some operational systems (e.g. Globalstar, Inmarsat BGAN, Iridium, and Thuraya). The last part of this paper is devoted to qualitative and quantitative comparisons of the different mobile satellite systems to understand their characteristics in terms of services, capacity, resource utilization efficiency, and user mobility degree.
An integrated voice and data multiple-access scheme for a land-mobile satellite system
Proceedings of the IEEE, 2000
A Land-Mobile Satellite System (LMSS) is a satellite-based corn munications network which provides voice and data communications to mobile users in a vast geographical area. By placing a "relay tower" at a height of 22300 mi, an LMSS can provide ubiquitous radio communication to vehicles roaming in remote or thinly populated area. LMSS is capable of supporting a variety of services, such as two-way alphanumeric service, paging service, full-duplex voice service, and half-duplex dispatch service. A Network Manage ment Center (NMC) will handle the channel requests, channel assignments, and in general the network control functions. A pool of channels is managed at the NMC to be shared by all mobile users. An integrated demandassigned multiple-access protocol has been developed for the experimental LMSS. The pool of channels is divided into reservation channels and information channels. The information channels can be assigned by the NMC to be either voice channels or data channels. Each mobile user must send a request through one of the reservation channels to the NMC via the ALOHA random-access scheme. Once the request is received and processed, the NMC will examine the current traffic condition and assign an information channel to the user. NMC will periodically update the partitions between the reservation channels, voice cham nels, and data channels to optimize system performance. Data channel requests are queued at the NMC while voice channel requests are blocked calls cleared. Various operational scenarios have been investigated. Tradeoffs between the data and voice users for a given delay requirement and a given voice call blocking probability have been studied. In addition, performance impacts of such technological advancements as satellite on-board switching and variable bandwidth assignment are discussed. 'Note that in (1) we have approximated G/S by ezGT. This is correct only if K + m. However, for K 3 15 7 , it is an excellent approximation. The exact expression can be found in 1161. LI A N D Y A N : VOICE A N D DATA ACCESS SCHEME FOR A LAND-MOBILE SATELLITE