Year: 2005
Type: dissertation
Abstract: The Automatic Position Reporting System (APRS) is a well-established packet communication protocol that offers users a graphical position display system and a peer-to-peer textual message service.APRS is used in temporary and mobile networks where rapid deployment of infrastructure is required and limited a priori knowledge of the network topology is available.The APRS protocol can be used for emergencies and public service applications.ARPS, functioning as an access network, was originally designed to require low complexity and support high flexibility of a network.These design directives have limited APRS's performance by resulting in low throughput and poor reliability.In order for APRS to be used in time-critical applications, these limitations would need to be improved.The thesis considers the limitations of ARPS by proposing an improved protocol stack with a substitution of the media access control (MAC) layer.The new protocol is modelled in order to develop a largely platform-independent implementation, which could be efficiently retargeted for different platforms.Lastly, a protocol performance evaluation is done in order to determine the resulting improvements on APRS and the overall viability of the proposal.iiiOpsomming Die Outomatiese Possisie Raporterings Stelsel (ARPS) is 'n gevestige pakkie kommunikasie stelsel en bied gebruikers 'n grafiese possisie vertoning stelsel en 'n gebruikertot-gebruiker teks boodskapdiens.APRS word gebruik in tydelike and mobiele netwerke waar vinnige ontplooing van infrastruktuur vereis word en beperkte a priori inligting van die network topologie beskikbaar is.Die APRS protokol kan gebruik word ten tyde van noodgevalle en vir toepassings in publieke dienste.APRS, wat funksioneer as 'n toegangsnetwerk, is oorspronklik ontwerp om lae kompleksiteit te vereis en hoë buigsaamheid van 'n netwerk te ondersteun.Hierdie ontwerpsvereistes het veroorsaak dat APRS se werkverrigting beperk word deur 'n lae data deurvoer en betroubaarheid.Ten einde APRS se gebruik in tydkritiese toepassings te bevorder, sal hierdie beperkinge verbeter moet word.Hierdie tesis bied 'n voorgestelde verbetering op die beperkinge van APRS deur 'n vervanging van die media toegangsbeheer vlak van die protokol stapel.Die nuwe protokol word dan gemodelleer ten einde 'n relatiewe platform onafhanklike implementering te ontwerp wat doeltreffend vir ander platforms aangepas kan word.Laastens word 'n protokol werkverrigting evaluasie gedoen om die verbetering op APRS te bepaal en die algehele lewensvatbaarheid van die voorstel vas te stel.• My supervisor Sias Mostert for his guidance and inspiration to always see the "big" picture,• The ESL personnel for the organized and sufficient research environment that they provided,• Mr F. Retief for his support with Linux and the C language,• Miss L. Scheepers for her encouragement and wisdom,• My family and friends who supported and encouraged me.v DedicationsThe thesis is dedicated to my Lord and Saviour, Jesus Christ, who is the way, the truth and the life, in whom only is abundant life !
Authors: Van Tonder, Hendrik Petrus
Language: English
Subfield: Computer Networks and Communications
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W281074209