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Integration of Satellite and Terrestrial OCS (Digest No: 1997/152), IEE Colloquium on

Date 7 Apr 1997

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Displaying Results 1 - 8 of 8
  • New mobility management and call routing protocols for dynamic satellite personal communication networks

    Page(s): 5/1 - 5/7
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (516 KB)  

    The aim of the paper is to present suitable mobility management and call routing protocols for a non-GEO based satellite personal communications network. These new protocols take into account the dynamic connectivity and power limitation of satellites. The impact of these protocols on a GSM integration scenario is highlighted and solutions proposed. Two future satellite constellations are used as examples in this paper; these are Globalstar and ICO-like systems View full abstract»

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  • Facing the challenge of developing test solutions for dual mode, satellite and terrestrial mobile systems

    Page(s): 6/1 - 6/5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    Racal Instruments Limited has been involved in the development and manufacture of test equipment for digital radio communications systems since the inception of the Global System for Mobile communications (GSM) in the late 1980s. Involvement in satellite mobile communication systems began with the development of production and service test equipment for the American Mobile Satellite Corporation (AMSC) system in 1992. Racal Instruments has also been involved in the development of test equipment for the Asia Cellular Satellite System (ACeS). This paper discusses the experience of Racal Instruments Limited in developing test equipment for testing dual mode satellite mobile terminals particularly for the ACeS system. The topics covered include: (1) the test equipment requirements of the dual mode handset developers; (2) specific issues faced by test equipment developers; (3) how Racal Instruments Limited has responded to the requirements and issues; and (4) how test equipment may evolve to meet future requirements View full abstract»

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  • Dual-mode satellite-cellular phones

    Page(s): 7/1 - 7/5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    Several mobile-satellite systems will be in commercial operation in the next 5 years. These systems will co-exist with terrestrial cellular systems augmenting their coverage and providing wide area roaming via the use of dual-mode (satellite-cellular) phones. The realization of dual-mode satellite-cellular handheld phones that are competitive in size and features with cellular phones is very dependent on the system design. This paper provides a perspective on the requirements and challenges in the design of such phones View full abstract»

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  • Digital communications protocols in the satellite environment

    Page(s): 4/1 - 4/7
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    Examines why terrestrial protocols suffer so badly in the satellite environment and offers suggestions as to what might be done to overcome the problems. The paper considers the issues with respect to TCP/IP and looks also at the intense interaction observed between some popular end user applications, the protocol and the satellite environment. The lesson to be learnt is that no element of the system may be viewed in isolation. To do so will inevitably result in a catastrophic reduction in performance. The paper first briefly examines the TCP/IP protocol and looks at the performance of the protocol over a typical VSAT link without any optimisation being made for the VSAT environment. We then look at two possible approaches to improving the situation. In the first we find that significant improvements may be made by tuning some of the protocol parameters to suit the satellite link, a simple step, but one that is often ignored and may be difficult if the end users are not within your control. The second step, more along the lines of a gedanken experiment, involves making slight modifications to the TCP/IP protocol. Since it is unlikely that the Internet Engineering Task Force, who control the evolution of the TCP/IP protocol, would ever consider making changes to the TCP/IP protocol stack solely for the benefit of satellite users, this remains a tantalising impossibility. Finally we look at what might be achieved by means of protocol encapsulation, protocol spoofing, protocol enhancement etc., which give valuable pointers to the possibilities (and problems) of integrating terrestrial/satellite protocols View full abstract»

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  • An integrated system architecture for GSM and satellite PCN

    Page(s): 3/1 - 3/9
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (608 KB)  

    This paper aims at designing an optimised GSM-satellite integration system architecture by minimising the signalling load generated by the inter-segment location update procedure. Dual-mode mobile terminal location management scenarios are introduced for various integration levels. The GSM location update signalling procedure has been taken as a reference. Both inter-segment signalling load and total signalling load on terrestrial links have been taken into account View full abstract»

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  • Development of a GSM-derived regional mobile satellite communication system

    Page(s): 1/1 - 111
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (696 KB)  

    In this paper, we describe the development of a GSM-derived regional mobile satellite communication system. We first discuss the market needs of a regional mobile communication system, and stress the technical requirements for such a system to be successful in the commercial world. We then point out the advantages of deriving such a system from the popular GSM standard and discuss the similarities and differences between the two systems. We then describe a system designed by Lockheed Martin Corp., known as ACeS, which serves the telecommunication needs of Asia. The ACeS system works in both the cellular and satellite environments and is designed to make optimal use of the similarities and differences to the GSM system. We end the paper by discussing some challenges in the evolving area of mobile satellite communication systems View full abstract»

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  • IEE Colloquium on Integration of Satellite and Terrestrial PCS (Ref. No.1997/152)

    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (52 KB)  

    The following topics were dealt with: GSM-derived regional mobile satellite communication system; GSM and satellite PCN integrated architecture; digital communications protocols; mobility management and call routing protocols; dual-mode satellite-cellular phones; software radios View full abstract»

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  • The application of software radios to integrated satellite/terrestrial communications

    Page(s): 8/1 - 8/6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (620 KB)  

    This paper details some of the problems of reconfigurable and adaptable hardware, along with a critical analysis of the basic approaches to software radio design, concentrating on the receiver architecture in particular. The European Commission ACTS FIRST project, along with significant research underway at the University of Bristol, is focused on addressing these issues. Work is also underway to enable cooperation with the ACTS SINUS project, which is examining the inter-operation of satellite and terrestrial communications systems. A genuine software radio is undoubtedly the ideal solution to this problem, but it remains to be seen if it is commercially and technologically realistic View full abstract»

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