Ricardo Matos | Pontifícia Universidade Católica do Rio de Janeiro (original) (raw)

Papers by Ricardo Matos

Telecommunication Systems

Wireless Mesh Networks (WMNs) have gained increasing attention as an attractive means to provide ... more Wireless Mesh Networks (WMNs) have gained increasing attention as an attractive means to provide connectivity in complement to access as offered by regular Internet Service Providers (ISPs). Such a grass-root technique, however, often suffers from detrimental operating conditions and poor quality. Network virtualization, on the other hand, has been widely advocated as a possibility to overcome what has often been referred to as the ossification of the Internet. Combining the concept of network virtualization with WMN technology, therefore, appears to be promising and desirable. It is envisioned that well managed multiple Virtual Networks (VNs) may overcome shortcomings of WMNs on the one hand, and extend the reach of the Internet beyond its current confinement into the realm and control of the user on the other hand. In this paper, we argue for a context-based approach for an effective means to extend multi-VNs from the Internet domain into WMN environments. We describe both mobility and preferences as context models in order to create virtualized WMNs based on these types of context models. As a result, it is envisioned to achieve a comprehensive connectivity coverage, accompanied by high assurance in network quality. We further present a distributed solution to manage multi-VNs, and a mobility-aware context use case to demonstrate the usefulness of our approach.

Wireless Mesh Networks (WMNs) have already shown high-potential to deal with the huge heterogenei... more Wireless Mesh Networks (WMNs) have already shown high-potential to deal with the huge heterogeneity of user requirements and network resources, due to the flexibility and self-organization capabilities of their infrastructure. In this scope, we provide a novel context-based multi-virtual architecture, to be applied to wireless-friendly mesh networking, and to support user requirements on demand by the deployment of several adaptable Virtual Networks (VNs) for different context-aware purposes. In this paper, we present an analytical model for the proposed multi-VN architecture. Our envisioned goal is the provisioning, allocation and distribution of the total bandwidth of mesh links onto the available context-based VNs. We aim to provide and define the limits of our multi-VN approach, in terms of the number of VNs, attached mesh clients, and virtual nodes per VN, in order to accomplish feasible delays for different communication requirements, based on a correct provisioning of the required VN bandwidth.

The anticipated deployment of IEEE 802.16-based wireless metropolitan area networks (WMANs) will ... more The anticipated deployment of IEEE 802.16-based wireless metropolitan area networks (WMANs) will usher a new era in broadband wireless communications. The adoption of the WiMAX technology for remote areas, for example, can address challenging scenarios in a cost-effective manner. While WiMAX Forum documents describe an architecture that inherently supports Quality of Service and mobility, several areas are left uncovered. We present an architecture which integrates WiMAX, Quality of Service and mobility management frameworks over heterogeneous networks, developing mechanisms for seamless handovers. Our approach takes into consideration the expected deployment of, on the one hand, the IEEE 802.21 (Media Independent Handover)

Wireless Mesh Networks (WMNs) have shown a high-potential to fulfill the requirements of the Next... more Wireless Mesh Networks (WMNs) have shown a high-potential to fulfill the requirements of the Next Generation Networks (NGNs). Although mobility management is crucial to develop large-scale WMNs, the heterogeneity of today’s Internet will imply a context-aware architecture in the future to optimize the users’ experience. Network virtualization, as a mean to share and isolate resources, can be used as an element to construct different types of virtual networks (overlays), each one optimized for a specific set of contexts: security, mobility, Quality of Service (QoS), cost, preferences. In this paper, we present a context-aware multi-overlay architecture that enables a user to connect to the WMN that best fits its requirements and approaches. We concentrate on how to build such an architecture: how a user can move maintaining its requirements through the re-configuration of overlays, and how context can be mapped, organized and distributed in the network nodes. We also discuss the entities and the complexity of this architecture.

1 -Broadband Wireless Access technologies are expected to play a central role in next generation ... more 1 -Broadband Wireless Access technologies are expected to play a central role in next generation networks. WiMAX, based on the IEEE 802.16 standard, has the potential to form the foundation upon which operators will deliver ubiquitous Internet access in the near future. It is also widely anticipated that the next generation wireless networks will handle an exponentially growth of audio/visual content. In order to evaluate the QoS performance over WiMAX, it is important to test the WiMAX system with real time services, such as VoIP and video streaming. This paper presents an evaluation of the WiMAX QoS performance using these services.

Abstract Although IEEE 802.16 has emerged as one of the major candidates for next generation netw... more Abstract Although IEEE 802.16 has emerged as one of the major candidates for next generation networks, it is also clear that in the near future the combination of several technologies will be required. In this sense, the support of mobility in heterogeneous environments, addressing broadband wireless, is one of the main requirements in next generation networks. This paper evaluates an architecture based on the recently standardized IEEE 802.21 framework, integrating both mobility and quality of service (QoS ...

Telecommunication Systems

Wireless Mesh Networks (WMNs) have gained increasing attention as an attractive means to provide ... more Wireless Mesh Networks (WMNs) have gained increasing attention as an attractive means to provide connectivity in complement to access as offered by regular Internet Service Providers (ISPs). Such a grass-root technique, however, often suffers from detrimental operating conditions and poor quality. Network virtualization, on the other hand, has been widely advocated as a possibility to overcome what has often been referred to as the ossification of the Internet. Combining the concept of network virtualization with WMN technology, therefore, appears to be promising and desirable. It is envisioned that well managed multiple Virtual Networks (VNs) may overcome shortcomings of WMNs on the one hand, and extend the reach of the Internet beyond its current confinement into the realm and control of the user on the other hand. In this paper, we argue for a context-based approach for an effective means to extend multi-VNs from the Internet domain into WMN environments. We describe both mobility and preferences as context models in order to create virtualized WMNs based on these types of context models. As a result, it is envisioned to achieve a comprehensive connectivity coverage, accompanied by high assurance in network quality. We further present a distributed solution to manage multi-VNs, and a mobility-aware context use case to demonstrate the usefulness of our approach.

Wireless Mesh Networks (WMNs) have already shown high-potential to deal with the huge heterogenei... more Wireless Mesh Networks (WMNs) have already shown high-potential to deal with the huge heterogeneity of user requirements and network resources, due to the flexibility and self-organization capabilities of their infrastructure. In this scope, we provide a novel context-based multi-virtual architecture, to be applied to wireless-friendly mesh networking, and to support user requirements on demand by the deployment of several adaptable Virtual Networks (VNs) for different context-aware purposes. In this paper, we present an analytical model for the proposed multi-VN architecture. Our envisioned goal is the provisioning, allocation and distribution of the total bandwidth of mesh links onto the available context-based VNs. We aim to provide and define the limits of our multi-VN approach, in terms of the number of VNs, attached mesh clients, and virtual nodes per VN, in order to accomplish feasible delays for different communication requirements, based on a correct provisioning of the required VN bandwidth.

The anticipated deployment of IEEE 802.16-based wireless metropolitan area networks (WMANs) will ... more The anticipated deployment of IEEE 802.16-based wireless metropolitan area networks (WMANs) will usher a new era in broadband wireless communications. The adoption of the WiMAX technology for remote areas, for example, can address challenging scenarios in a cost-effective manner. While WiMAX Forum documents describe an architecture that inherently supports Quality of Service and mobility, several areas are left uncovered. We present an architecture which integrates WiMAX, Quality of Service and mobility management frameworks over heterogeneous networks, developing mechanisms for seamless handovers. Our approach takes into consideration the expected deployment of, on the one hand, the IEEE 802.21 (Media Independent Handover)

Wireless Mesh Networks (WMNs) have shown a high-potential to fulfill the requirements of the Next... more Wireless Mesh Networks (WMNs) have shown a high-potential to fulfill the requirements of the Next Generation Networks (NGNs). Although mobility management is crucial to develop large-scale WMNs, the heterogeneity of today’s Internet will imply a context-aware architecture in the future to optimize the users’ experience. Network virtualization, as a mean to share and isolate resources, can be used as an element to construct different types of virtual networks (overlays), each one optimized for a specific set of contexts: security, mobility, Quality of Service (QoS), cost, preferences. In this paper, we present a context-aware multi-overlay architecture that enables a user to connect to the WMN that best fits its requirements and approaches. We concentrate on how to build such an architecture: how a user can move maintaining its requirements through the re-configuration of overlays, and how context can be mapped, organized and distributed in the network nodes. We also discuss the entities and the complexity of this architecture.

1 -Broadband Wireless Access technologies are expected to play a central role in next generation ... more 1 -Broadband Wireless Access technologies are expected to play a central role in next generation networks. WiMAX, based on the IEEE 802.16 standard, has the potential to form the foundation upon which operators will deliver ubiquitous Internet access in the near future. It is also widely anticipated that the next generation wireless networks will handle an exponentially growth of audio/visual content. In order to evaluate the QoS performance over WiMAX, it is important to test the WiMAX system with real time services, such as VoIP and video streaming. This paper presents an evaluation of the WiMAX QoS performance using these services.

Abstract Although IEEE 802.16 has emerged as one of the major candidates for next generation netw... more Abstract Although IEEE 802.16 has emerged as one of the major candidates for next generation networks, it is also clear that in the near future the combination of several technologies will be required. In this sense, the support of mobility in heterogeneous environments, addressing broadband wireless, is one of the main requirements in next generation networks. This paper evaluates an architecture based on the recently standardized IEEE 802.21 framework, integrating both mobility and quality of service (QoS ...