Isabella Cerutti

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In conventional (noncooperative) automatic repeat request (ARQ) protocols for radio networks, the corrupted data frames that cannot be correctly decoded at the destination are retransmitted by the source. In cooperative ARQ protocols, data frame retransmissions may be performed by a neighboring node (the relay) that has successfully overheard the source's(More)
Energy-efficient optical networks are gaining momentum as environmental-friendly solutions with reduced operational costs. Energy-efficiency can be achieved by using devices in sleep mode, i.e., a low-power, inactive state in which devices can be suddenly waken-up upon occurrence of triggering events. This paper advocates a sleep mode option for the optical(More)
Estimates indicate that about 80% of the power consumption of cellular networks must be supplied by operators. It is thus becoming of paramount importance to improve the energy efficiency of cellular networks at the operator side for an economic and environmentally-sustainable traffic growth. The introduction of discontinuous transmission – or sleep mode –(More)
This paper focuses on the problem of ensuring quality of service (QoS) to 4G network users. An adaptive cross-layer (ACL) strategy, that jointly optimizes the parameters of physical (PHY) and medium access control (MAC) layers using queueing theory, is proposed and applied to mobile user communications in an OFDM-based wireless network. PHY and MAC layers(More)
This paper demonstrates that cooperative ARQ protocols have the desirable property of increasing the saturation throughput of fixed multiplexed access radio networks, subject to non-uniform offered traffic. The throughput gain is found to be increasing as the sourceto-destination channel quality deteriorates and the sourceto-relay channel quality(More)
The design of survivable all-optical networks based on self-healing WDM rings (SHR/WDM) to provide 100% protection from any single link failure requires the joint solution of three sub-problems. These are the Ring Cover of the mesh topology (the RC sub-problem), the routing of Working Lightpaths between node pairs to support trafflc demands (the WL(More)
In wavelength-routed networks based on a GMPLS control plane, the resource reservation protocol with traffic engineering extensions (RSVP-TE) allows to establish end-to-end lightpaths. The resource reservation can be blocked due to lack of available resources (forward blocking) or due to resource contentions (backward blocking). In wavelength-routed(More)
The present paper considers a WDM optical packet ring in which multiple wavelengths are operated in a synchronous manner. This architecture attempts to blend packet switching techniques with optical transparency in order to offer a flexible MAN architecture able to accommodate large amounts of traffic demands. This architecture also performs traffic(More)
The interest in the energy consumption of communication networks has risen in the recent years. In an effort to tackle this problem, several approaches have been presented to reduce the power consumed by the entire network infrastructure, including optical transport. Most of the solutions studied and proposed in the literature, however, pay little or no(More)
The evolution of optical technologies has paved the way to the migration from opaque optical networks (i.e., networks in which the optical signal is electronically regenerated at each node) to transparent (i.e., all-optical) networks. Translucent optical networks (i.e., optical networks with sparse opto-electronic regeneration) enable the exploitation of(More)