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Publications

Publications by Manuel Ricardo

2012

Video streaming over multi-radio access networks: An access aggregation approach

Authors
Novo, N; Gomes, A; Neves, P; Ricardo, M; Oliveira, JM;

Publication
2012 20th International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2012

Abstract
Nowadays it's common to find the same place covered by multiple access networks. For that reason, mobile terminals are normally equipped with multiple network interfaces, which allow users to take advantage of the heterogeneity of those networks. This paper presents an architecture capable of using, in a simultaneous way, the multiple network interfaces existent in the mobile terminal for accessing a video streaming service. With this goal in mind, a solution on the session layer was developed, allowing the creation of an abstraction layer for the intervening applications. The purposed solution is composed by two modules, responsible for the division and aggregation of the transmitted data through multiple interfaces. The obtained results show that the developed architecture is not only capable of interconnecting two machines through multiple interfaces in a simultaneous way, but it is also capable of processing a video stream division in an intelligent way, accordingly to the network conditions. © 2012 University of Split.

2012

FRAMEWORK FOR QOS PERFORMANCE ASSESSMENT ON BIOMEDICAL WIRELESS SENSOR NETWORKS

Authors
Abreu, C; Ricardo, M; Mendes, P;

Publication
BIODEVICES: PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON BIOMEDICAL ELECTRONICS AND DEVICES

Abstract
A Biomedical Wireless Sensor Network (BWSN) is a special Wireless Sensor Network (WSN) with a small number of nodes designed for medical applications. These networks must ensure that medical data is delivered reliably and efficiently, M order to fulfil a sel of pre-established Quality of Service (QoS) requirements, In this way, the research community have been proposing new solutions to improve QoS in WSN, namely in routing protocols and power consumption efficiency. However, there slid a need for appropriate QoS guaranties ha BWSN. In this paper, possible QoS requirements of BWSN are discussed, together with a framework to automatically evaluate the performance of such QoS techniques. That framework was used together with simulators and operating systems appropriate for WSN, COOJA and Contiki OS, and proved to be a valuable tool for a proper evaluation of QoS parameters and metrics.

2011

MONITORING QoS OVER WIRELESS SENSOR NETWORKS For Medical Applications

Authors
Abreu, C; Ricardo, M; Mendes, P;

Publication
BIODEVICES 2011

Abstract
Wireless Sensor Networks (WSNs) for medical purposes enables real-time (RT) acquisition of vital signals. In this context the network reliability, data integrity and RT delivery have extreme importance. The network should guarantee an appropriate level of Quality of Service (QoS). This paper presents the QoS parameters and metrics of standard telemedicine and WSNs based Medical Applications (MA), and a strategy, based on QoS monitoring, to prevent QoS degradation in WSNs for MA.

2008

Resource Management in Multi-Radio Renegotiation and Re-allocation calls.

Authors
Del Monego, HI; Oliveira, JM; Ricardo, M;

Publication
ACTAS DE LA III CONFERENCIA IBERICA DE SISTEMAS Y TECNOLOGIAS DE LA INFORMACION, VOL 2

Abstract

2005

Protocol conformance using a progressive test approach

Authors
Mamede, J; Carrapatoso, E; Ricardo, M;

Publication
PROCEEDINGS OF THE SECOND IASTED INTERNATIONAL MULTI-CONFERENCE ON AUTOMATION, CONTROL, AND INFORMATION TECHNOLOGY - COMMUNICATION SYSTEMS

Abstract
The development of communications systems demands testing. This paper presents a framework for testing on-the-fly, which relies on the definition of 3 types of tests and on their sequential execution. The ioco conformance relation was considered in order to assign verdicts. A tool prototype is also presented that supports the proposed framework. This tool, named PROFYT, was developed based on the SPIN verifier, and uses communicating FSMs to describe the specification. The test of Conference Protocol implementations was carried out on-the-fly with PROFYT and enabled us to conclude about the benefits of the test methodology proposed.

2005

MPLS - Multiprotocol Label Switching

Authors
Ruela, J; Ricardo, M;

Publication
The Industrial Information Technology Handbook

Abstract

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