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Authors
Advisor(s)
Abstract(s)
Nos dias de hoje e no futuro, vai ser cada vez mais importante a necessidade
de existir uma coexistência entre diferentes redes móveis a operarem nas mesmas
bandas, face a reutilização do espetro. Posto isto, algumas operadoras Global
System for Mobile Communications-Railways (GSM-R) notaram limitações operacionais
causadas por interferências provenientes de outras redes móveis o que tende
a aumentar cada vez mais, devido ao crescimento esperado das redes GSM-R e
ao potencial crescimento de redes móveis públicas.
Assim sendo, um dos passos fundamentais no planeamento de uma rede rádio
de comunicações móveis é a escolha das frequências utilizadas dada a necessidade
de coexistência, não só com outros operadores mas com a própria rede. Em
comunicações móveis ferroviárias esta escolha requer uma maior exatidão do que
nas redes públicas, tendo em conta os requisitos de segurança que as abrangem.
Assim, é necessário utilizar algoritmos que estimem a interferência proveniente,
não só das redes ferroviárias, mas também dos operadores públicos, de modo a
obter um melhor planeamento/otimização das redes GSM-R.
Posto isto, o objetivo deste trabalho consiste em demonstrar o impacto que as
redes implementadas pelos operadores públicos têm face às redes dos operadores
ferroviários.
Deste modo, foram realizados algoritmos/software, de modo a testar redes reais,
para comprovar este impacto. Estes algoritmos foram desenvolvidos de modo
a ser integrado com uma ferramenta já existente para o planeamento rádio em
ferrovia denominada por SIGRail. O algoritmo foi validado com a comparação
com medidas reais recolhidas no cenário de estudo. Os resultados permitiram concluir que, para o cenário em estudo, o impacto que
as redes dos operadores públicos têm face ao GSM-R é bastante acentuado, podendo
mesmo, em certas zonas, tornar impraticável o estabelecimento de comunicações
entre terminais móveis GSM-R.
Today and in the future, the need for different mobile networks operating in the same bands to coexist in the face of spectrum reuse will become increasingly important. That said, some GSM-R operators have noticed operational limitations caused by interference from other mobile networks, which is tending to increase more and more due to the expected growth of GSM-R networks and the potential expansion of public mobile networks. Therefore, one of the key steps in planning a mobile radio network is the choice of frequencies used given the need for coexistence not only with other operators but with the network itself. In mobile railway communications this choice requires greater accuracy than in public networks, taking into account the safety requirements covering them. It is therefore necessary to use algorithms that estimate interference not only from railway networks but also from public operators in order to achieve better planning/optimisation of gsmr networks. That said, the objective of this work is to demonstrate the impact that the networks implemented by public operators have on the networks of railway operators. Subsequently, algorithms/software were performed in order to test real networks to prove this impact. These algorithms were developed to be integrated with an existing tool for railway radio planning called SIGRail. The algorithm was validated by comparison with real measurements collected in the study scenario. The results show that, for the scenario under study, the impact of the public operators networks on GSM-R is quite strong and may even, in certain areas, make it impractical to establish communications between gsmr mobile terminals.
Today and in the future, the need for different mobile networks operating in the same bands to coexist in the face of spectrum reuse will become increasingly important. That said, some GSM-R operators have noticed operational limitations caused by interference from other mobile networks, which is tending to increase more and more due to the expected growth of GSM-R networks and the potential expansion of public mobile networks. Therefore, one of the key steps in planning a mobile radio network is the choice of frequencies used given the need for coexistence not only with other operators but with the network itself. In mobile railway communications this choice requires greater accuracy than in public networks, taking into account the safety requirements covering them. It is therefore necessary to use algorithms that estimate interference not only from railway networks but also from public operators in order to achieve better planning/optimisation of gsmr networks. That said, the objective of this work is to demonstrate the impact that the networks implemented by public operators have on the networks of railway operators. Subsequently, algorithms/software were performed in order to test real networks to prove this impact. These algorithms were developed to be integrated with an existing tool for railway radio planning called SIGRail. The algorithm was validated by comparison with real measurements collected in the study scenario. The results show that, for the scenario under study, the impact of the public operators networks on GSM-R is quite strong and may even, in certain areas, make it impractical to establish communications between gsmr mobile terminals.
Description
Dissertação para obtenção do grau de Mestre em Engenharia de Eletrónica e Telecomunicações
Keywords
Qualidade de serviço Quality of service Interferência Interference Comunicações ferroviárias Railway communications Planeamento de frequências Frequency planning Otimização Optimization
Citation
ROUCO, André Miguel Antunes - QoS em comunicações ferroviárias : impacto da interferência de redes públicas. Lisboa: Instituto Superior de Engenharia de Lisboa, 2021. Dissertação de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa