Investigation into the optimization of low speed communication protocols for narrow band networks

[摘要] ENGLISH ABSTRACT: In this thesis, the investigation into the optimization of low speed communication protocols for narrow band networks willbe presented. The main focus will be on analysing commonly used low speed communication protocols and investigate analternative to these protocols to provide an optimized low speed narrow band network that provides better performance athigh and low channel utilization. A study of existing low speed communication networks within the field of water supplyhas been used to identify the most appropriate protocols to be included in the analysis. The analysis of each protocoldiscussed includes the development of a simulation and theoretical model, with parameters based on those obtainedfrom implemented communication networks focusing on the parameters used within the Namib water supply scheme ofNamWater in Namibia.Of the currently implemented contention protocols, the non-persistent Carrier Sense Multiple Access (CSMA) protocolis implemented the most. Current models used for modelling these protocols make use of various assumptions. Thesemodels have been expanded to provide a more accurate representation of the non-persistent CSMA model. The RoundRobin Polling (RRP) protocol is another well known protocol used within the telemetry industry and has also beenmodelled as an alternative to the non-persistent CSMA model.The Adaptive Tree Walk (ATW) protocol has been identified as the limited contention protocol to be modelled as apossible alternative to the conventional methods used. A new model has been developed for modelling this protocol bymaking use of the same strategies and tools used in the modelling of the non-persistent CSMA and RRP protocols.The Simulation modelling has been developed by making use of DESMO-J, an Object Orientated Simulation API based inJava, developed by the Faculty of Informatics at the University of Hamburg. DESMO-J has been chosen as an alternative tothe more traditional simulation languages due to its complete documentation, support structures, ease of use and flexibility.All theoretical models have been implemented in Matlab.

[发布机构] Stellenbosch University