Lluís Gutierrez

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Even if Passive Optical Networks (PONs) have proven to be more energy-efficient that other access solutions, energy consumption minimization is becoming an important research target also in PON. In particular, to sustain the increased bandwidth demand of emerging applications in the access section of the network, new hybrid PON solutions employing WDM/TDM(More)
Ethernet-based passive optical networks (EPON) are being considered as the best candidates for the next generation broadband access networks. Several algorithms for dynamic bandwidth allocation in EPON have been proposed, as this is an open issue that was left out of the scope of the standard IEEE 802.3ah. Very few of those works address the possibilities(More)
One of the main challenges of Passive Optical Networks (PONs) is the resource (bandwidth and wavelength) management. Since it has been shown that access networks consume a significant part of the overall energy of the telecom networks, the resource management schemes should also consider energy minimization strategies. To sustain the increased bandwidth(More)
Future metropolitan and access networks are expected to comprise heterogeneous optical and broadband wireless technologies. The growing demand of users for transparent, ubiquitous access to diverse communication services poses several challenges. We envision a future metro-access architecture that comprises Optical Burst Switching networks that feed(More)
The Next Generation Access Networks (NGAN) are the new step forward to deliver broadband services and to facilitate the integration of different technologies. The real challenge faced by 10GEPON new standard IEEE 803.3av is to upgrade the channel capacity for both upstream and downstream channels gracefully, while maintaining the logical layer intact(More)
The access network infrastructure plays an important role in the overall performance of the network, next generation access networks (NGA) must be able to access diverse services, and should incorporate adequate architectures that include mechanisms for the integration of different technologies. New optical access technologies trends are: WDM, 10 Gb/s, and(More)
Random Multi-access Protocols has been used as the MAC protocol over Multi-access channels. They are specially recommended when there are a large population of users with low and bursty traffic as for example it will be in HFC (Hybrid Fiber-Coax) networks with multimedia services, we should be sure that the access to the network copes with the QoS. each(More)
CANDLE (Cooperative And Network Distributed Learning Environment) is a new European project supported by European Telecommunications Schools members of EUNICE, and others partners as: BT, IOE, Siemens,. .. The project is supported by the EC within the IST Program. The objective of this project is to use the Internet to improve the quality and reduce the(More)
CANDLE (Cooperative And Network Distributed Learning Environment) is a new European project supported by European Telecommunications Schools members of EUNICE, and others partners as: BT, IOE, Siemens, . . . The project is supported by the EC within the IST Program. The objective of this project is to use the Internet to improve the quality and reduce the(More)
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