Xavier Pérez Costa

Future Smartphones R&D (LTE/WLAN)

The project consists in evaluating different functionality options for future NEC's LTE/WLAN smartphone devices, design proprietary algorithms and provide optimal configuration parameters for selected use cases.

 

LTE and LTE-A Base Stations R&D

The objective of this project is the design and evaluation of efficient Radio Resource Management and Admission Control solutions for NEC's LTE Node-Bs as well as future LTE-A eNode-Bs.

 

WiMAX PasoWings Base Station BS202 (2.5 GHz)

The project consisted in the design and evaluation of efficient Radio Resource Management and Admission Control solutions for NEC's WiMAX PasoWings Base Station BS202 in the 2.5 GHz band.

 

 

N906iL - Third NEC Dual-Mode Mobile Phone

The project consisted in the optimization of the WLAN part of NEC's third dual-mode terminal (3G/WLAN), N906iL, with a special focus on QoS and power saving performance.

 

 

WiMAX PasoWings Base Station (3.5 GHz)

The project consisted in the design and evaluation of efficient Radio Resource Management and Admission Control solutions for NEC's WiMAX PasoWings Base Station in the 3.5 GHz band.

 

 

N902iL - Second NEC Dual-Mode Mobile Phone

The project consisted in the optimization of the WLAN part of NEC's secondt dual-mode terminal (3G/WLAN), N902iL, with a special focus on QoS and power saving performance.

 

 

WiMAX PasoWings Base Station (2.5 GHz)

The project consisted in the design and evaluation of efficient Radio Resource Management and Admission Control solutions for NEC's WiMAX PasoWings Base Station in the 2.5 GHz band .

 

 

N900iL - First NEC Dual-Mode Mobile Phone

The project consisted in the optimization of the WLAN part of NEC's first dual-mode terminal (3G/WLAN), N900iL, with a special focus on QoS and power saving performance.

 

 

WiMAX-WiFi Interworking

The objective of this project was the analysis of different WiMAX-WiFi interworking scenarios focusing on the design and evaluation of solutions for guaranteeing end-to-end QoS.

 

 

IP-based UMTS Radio Access Networks

The project focused on the design of solutions to provide the required QoS in IP-based UMTS Terrestial Radio Access Networks (UTRANs) while minimizing the signaling overhead required for IP services. Several proposals were designed and evaluated.

 

QoS for Wireless LANs (IEEE 802.11e)

The goal of the project was to contribute to the standardization process of QoS features in the IEEE 802.11 Enhancements Task Group (802.11e). We proposed our own approach to Task Group ‘E’, in line with IETF’s Differentiated Services architecture, and evaluated it analytically and via simulation.

FLAVIA -FLexible Architecture for Virtualizable wireless future Internet Access-

European Project, FP7 Call 5, Objective 1.1: The Network of the Future

Wireless networks importance for the Future Internet is raising at a fast pace as mobile devices increasingly become its entry point. However, today's wireless networks are unable to rapidly adapt to evolving contexts and service needs due to their rigid architectural design. We believe that the wireless Internet’s inability to keep up with innovation directly stems from its reliance on the traditional layer-based Internet abstraction. Especially, the Link Layer interface appears way too abstracted from the actual wireless access and coordination needs. FLAVIA fosters a paradigm shift towards the Future Wireless Internet: from pre-designed link services to programmable link processors. The key concept is to expose flexible programmable interfaces enabling service customization and performance optimization through software-based exploitation of low-level operations and control primitives, e.g., transmission timing, frame customization and processing, spectrum and channel management, power control, etc. FLAVIA’s approach is based on three main pillars: i) lower the interface between hardware-dependent layers and upper layers, ii) apply a hierarchical decomposition of the MAC/PHY layer functionalities, and iii) open programmable interfaces at different abstraction levels. To prove the viability of this new architectural vision, FLAVIA will prototype its concept on two wireless technologies currently available, 802.11 and 802.16, representing today’s two main radio resource allocation philosophies: contention-based and scheduled. Moreover, FLAVIA will assess the applicability of the proposed architecture concepts to the emerging 3GPP standards. FLAVIA’s concept will allow boosting innovation and reducing the cost of network upgrades. Operators, manufacturers, network designers, emerging third-party solution developers, and even spontaneous end users, will be able to easily and rapidly optimize and upgrade the wireless network operation, quickly prototype and test their new protocols, and adapt the wireless access operation to emerging scenarios or service needs.

 

CARMEN – CARrier grade MEsh Networks-

European Project, FP7 Call 1, Objective 1.1: The Network of the Future

CARMEN, CARrier grade MEsh Networks, studies and specifies a wireless mesh network supporting carrier grade triple-play services for mobile/fixed network operators. Future operator networks will be comprised of a common core network and several access networks, and the CARMEN access network will complement other access technologies by providing a low cost and fast deployment mesh network access technology. The project proposes the integration of heterogeneous wireless technologies in a multi-hop fashion to provide scalable and efficient ubiquitous quad-play carrier services. To address the integration complexity of heterogeneous radio technologies, CARMEN introduces a layer 2.5 located between the subnet layer and the routing layer (the abstract interface in the architecture figure below), in order to abstract technology specific issues into a common set of events and commands. Upper layers will use the abstract interface of layer 2.5 to dynamically adapt functions such as routing, mobility and monitoring. One relevant issue is that CARMEN will provide capacity handling algorithms to exploit specific features of the mesh networks such as the availability of multiple links between two peers (i.e. multipath) or the use of radio broadcast instead of unicast to alleviate the load of broadcast services (e.g. video) in the mesh network. CARMEN will focus on three planes: technology, message transfer, and self-configuration and management, to provide a complete solution for setting up and maintaining a cost-effective carrier grade wireless mesh access network.

 

Moby Dick -Mobility and Differentiated Services in a Future IP Network-

European Project, FP5, Objective 5.2: Terrestrial Wireless System and Networks

In order to continue to evolve 3rd Generation mobile and wireless infrastructure towards the Internet - targeting IST 2000 IV 5.2 "Terrestrial Wireless System and Networks", the Moby Dick project defined, implemented, and evaluated an IPv6-based mobility-enabled end-to-end QoS architecture starting from the current IETF's QoS models, Mobile-IPv6, and AAA framework. A representative set of interactive and distributed multimedia applications served to derive system requirements for the verification, validation, and demonstration of the Moby Dick architecture in a testbed comprising UMTS, 802.11 Wireless LANs and Ethernet. When the existing applications or the underlying architectures did not provide what was required, the necessary modification were undertaken.