Virginia Corvino

A Novel Distributed Interference Mitigation Technique using Power Planning

This paper introduces a new method for distributed interference mitigation in full spectral-reuse OFDMA cellular networks. This considers the use of pre-defined frequency-domain power profiles helping make the interference more predictable across the subcarriers. We propose a method for computing the power profiles so as to maximize the capacity of the system in case of maximum throughput scheduling, and a simple linear model implemented also in presence of a fairness-oriented scheduler. We prove that our idea of power planning gives substantial improvements in terms of outage capacity in case of fairness-oriented scheduling. The advantage of our method over previously proposed approaches for interference mitigation based on power control is that our algorithm is fully distributed and does not require any exchange of signaling between the different cells.

Cross-layer radio resource allocation: The journey so far and the road ahead

The cross-layer concept originated almost ten years ago with the aim of taking the most advantage from the difficult wireless media to break the barriers imposed by the layered transmission. One of the domains where cross-layer design has been more investigated is Radio Resource Allocation, since current and future networks need to provide wireless connectivity to heterogeneous users, offering many different data traffic types. Nonetheless, new paradigms are emerging in the field of wireless communications, like cognitive radios, wireless systems with relays and Multiple Input Multiple Output (MIMO) systems, where the potential advantages of cross-layer scheduling are still largely unknown. Moreover, in spite of a large literature on cross-layer, in the most cases different focuses and perspectives, biased by the application(s), are addressed, thus, there is lack of a general framework. The main goal of this paper is not to provide a state of the art on cross-layer scheduling and resource allocation, since this would result maybe in a heterogeneous list of scientific contributions. Rather, we are interested in performing a cataloguing of the work so far, trying to identify common tools and general frameworks used for cross-layer resource allocation, justify them by means of specific network examples and highlight open issues and challenges to be faced. Nevertheless, a preliminary objective of this work is to introduce a set of definitions which can be hopefully agreed by the scientific community.

Cross-Layer Resource Allocation for MC-CDMA

In this work we investigate the behaviour of a cross- layer resource assignment scheme for a multi-carrier code division multiple access cellular system composed of two separate stages named Resource Allocation and Scheduling, air interface- aware and unaware respectively. More precisely, we consider different combinations of three scheduling and three resource allocation strategies in the presence of mixed realistic traffic (video and FTP). A channel- and application-aware scheduling strategy implementing a real cross-layer approach is proposed and compared with the traditional Maximum Throughput and the Wireless Fair Service algorithms. We show that the performance of the scheduling policies are seriously influenced by the implemented resource allocation strategy and, in case of heavily traffic loaded system, the proposed adaptive scheduler outperforms the other techniques.

Position-based power planning for fair resource allocation in LTE-A

This paper considers the use of predefined frequency-domain power profiles in downlink LTE-A aiming at making interference predictable across the Physical Resource Blocks, to be combined with fair resource allocation. In particular, the power profile structure is defined depending on the position of the users and fairness-oriented scheduling strategies are considered. Evaluations of the throughput and fairness achieved in the system depending on different scheduling algorithms are reported, as well as a comparison with scheduling strategies implementing power control techniques at similar complexity. Results show that, when resource allocation is SINR-based and focuses on cell-edge users, the highest sum rate and average per user rate is achieved without significant loss from the optimum fairness.

Cross-Layer Scheduling for Multiple Video Streams over a Hierarchical Emergency-Deployed Network

Wireless ad hoc networks attract raising interest in research due to flexibility of application and deployment. Moreover, cross-layer design is emerging as one of the most appealing approaches in network design. In this paper we focus on cross-layer scheduling of video traffic over a wireless hierarchical ad hoc network, where nodes are equipped with a camera device and are deployed over an endangered indoor area, transmitting video streams to a special node, namely the sink. This node is enroled to collect, elaborate and send them to a control unit which takes decisions accordingly. In particular, we address the problem of the multiple access in the transmission from the nodes equipped with camera devices to the sink. The scheduling strategy proposed takes into account information coming from both the physical layer and the application level. Results show that the cross-layer strategy significantly outperforms the maximum throughput in case of heavily loaded systems and performs like the maximum throughput in case of fully loaded system.

Cross‐layer scheduling over a heterogeneous opportunistic emergency‐deployed wireless network

Purpose – The purpose of this paper is to study the radio resource assignment problem in the context of a heterogeneous ad hoc network, composed of 1EEE802.15.4 sensor devices, their coordinators, mobile terminals conveying vldeo streams, and sinks. This scenario also fits to the paradigm of opportunistic networks.Design/methodology/approach – In such hierarchical heterogeneous opportunistic networks, the focus is on cross‐layer scheduling of the video and sensor traffics toward the sink. The scheduling strategy proposed takes into account information coming from both physical and application layers. Evaluations are performed via simulations.Findings – Results show that the proposed cross‐layer strategy significantly outperforms the maximum throughput scheduling, used as a benchmark, in case of video traffic, while preseruing the same performance for 802.15.4 traffic.Practical implications – The architecture and the relevant algorithms proposed could be used in realistic emergency‐deployed networks compos...