Entity

Time filter

Source Type

Aveiro, Portugal

Goncalves D.,PT Comunicacoes | Amaral A.,PT Inovacao | Costa A.,University of Minho | Sousa P.,University of Minho
Telecommunication Systems | Year: 2015

IP networks are currently the major communication infrastructure used by an increasing number of applications and heterogeneous services, including voice services. In this context, the session initiation protocol (SIP) is a signaling protocol widely used for controlling multimedia communication sessions such as voice or video calls over IP networks, thus performing vital functions in an extensive set of public and enterprise solutions. However, the SIP protocol dissemination also entails some challenges, such as the complexity associated with the testing/validation processes of IMS/SIP networks. As a consequence, manual IMS/SIP testing solutions are inherently costly and time consuming tasks, being crucial to develop automated approaches in this specific area. In this perspective, this article presents an experimental approach for automated testing/validation of SIP scenarios in IMS networks. For that purpose, an automation framework is proposed allowing to replicate the configuration of SIP equipment from the production network and submit such equipment to a battery of tests in the testing network. The proposed solution allows to drastically reduce the test and validation times when compared with traditional manual approaches, also allowing to enhance testing reliability and coverage. The automation framework comprises of some freely available tools which are conveniently integrated with other specific modules implemented within the context of this work. In order to illustrate the advantages of the proposed automated framework, a real case study taken from a PT Inovação customer is presented comparing the time required to perform a manual SIP testing approach with the one time required when using the proposed automated framework. The presented results clearly corroborate the advantages of using the presented framework. © 2015 Springer Science+Business Media New York Source


Cruz T.,University of Coimbra | Simoes P.,University of Coimbra | Bastos F.,PT Inovacao | Monteiro E.,University of Coimbra
Proceedings of the 2010 International Conference on Network and Service Management, CNSM 2010 | Year: 2010

Presently there is a lack of remote desktop management solutions for domestic and SOHO users connected to broadband access networks. This contrasts with the enterprise LAN environment, where there are several standards, resources and frameworks for PC or thin-client management. Among these, one specific remote boot technology - the Preboot eXecution Environment (PXE) [1] - is now the basis for a wide array of LAN-wide desktop management applications. In this context, integrating PXE-based solutions into broadband access networks would allow novel management paradigms, targeting not just domestic end-users but also telecommuters working from their homes and small businesses which are too small for local deployment of full-fledged enterprise desktop management platforms. In this paper we propose a solution that brings the benefits of managed desktop computing to home users, telecommuters and small businesses by integrating PXE technologies into broadband access network environments. In addition, we also propose a desktop services delivery model capable of efficiently providing a secure and quality managed desktop experience to domestic and SOHO end-users, using a PXE-based thin-client platform for broadband environments that can replace a full-fledged PC whilst maintaining most of its benefits. © 2010 IEEE. Source


Llorente R.,Polytechnic University of Valencia | Morant M.,Polytechnic University of Valencia | Pellicer E.,Polytechnic University of Valencia | Herman M.,Towercom a.s. | And 12 more authors.
Optics Express | Year: 2014

In this paper the on-the-field performance of a WDM-PON optical access providing quintuple-play services using orthogonal frequency division multiplexing (OFDM) modulation is evaluated in a real fiber-tothe- home (FTTH) network deployed by Towercom operator in Bratislava (Slovakia). A bundle of quintuple-play services comprising full-standard OFDM-based signals (LTE, WiMAX, UWB and DVB-T) and an ad-hoc OFDM-GbE signal is transmitted in coexistence per single user. Both downstream and upstream transmission performances are evaluated in different on-the-field long-reach optical link distance configurations. Four wavelength multi-user transmission of quintuple-play OFDM services is demonstrated exceeding 60.8 km reach in standard single mode fiber. © 2014 Optical Society of America. Source


Azevedo J.,INESC Porto | Pereira R.L.,INESC Porto | Chainho P.,PT Inovacao
Proceedings of the 1st Workshop on All-Web Real-Time Systems, AweS 2015 - In Conjunction with EuroSys 2015 | Year: 2015

Today we use smartphones and personal computers everywhere to communicate in ways made possible by the ubiquity of the Internet: we exchange emails and instant messages, make voice and video calls and participate in social media. WebRTC furthers the possibilities of audio and video communications and true peer-to-peer communications as it brings these capabilities also to an universal platform: the browser. But communication is more than just audio or video sharing, communication is about providing features capable of filling the distance void. Today we have sensors that can provide data to enrich communication by enabling the usage of information about the context of the remote peer, e.g.: providing temperature information, speed or acceleration. Mobile devices, being equipped with a range of sensors, such as accelerometers, gyroscopes and magnetometers are prime terminals to enrich communications with context data, but all types of devices can make use of external sensing devices or even reach out to sensor networks. As the browser becomes a fundamental platform, sensor data is also relevant to non WebRTC web applications. In this paper, we present an API proposal to enable web applications to access sensor data and an extension to WebRTC to enable peer-to-peer exchange of sensor data, bringing nearby sensor streams to web applications and multimedia communication over the web. Telemedicine, Meteorology or Seismology are prime examples of the applicability of this technology, that also enables new types of context-aware and context-based applications and communications. Copyright © 2015 ACM. Source


Oliveira N.,PT Inovacao | Rocha J.G.,University of Minho
Proceedings of CUPUM 2013: 13th International Conference on Computers in Urban Planning and Urban Management - Planning Support Systems for Sustainable Urban Development | Year: 2013

The 3D city models play a major role in urban management. Several commercial solutions are being provided by major software vendors with limited success. Major improvements must be made at several levels, from data capturing to visualization, to further improve 3D usage. Standards are necessary to support the integration of several different tools from different providers, to fully support 3D. In this paper we describe our first experience with the open source implementation of the Web 3D Service (W3DS) proposed standard on Geoserver. We want to assess W3DS functionality in a real case scenario and its interoperability with other tools. The W3DS was used within the context of city management of telecommunications infrastructures. Some remarks are presented from the lessons learned. Source

Discover hidden collaborations