Xavier Gelabert's Publications List

Exploiting the Operating Point in Sensing-Based Opportunistic Spectrum Access Scenarios

2010-01-21T11:21:23Z

Spectrum sensing is one key enabler towards opportunistic spectrum access in cognitive radio networks. Such scenarios allow cognitive users (a.k.a. secondary users) to access some licensed spectrum band as long as they do not interfere with the licensed (or primary) users. The main goal is to achieve an efficient and utmost access to the otherwise underutilized spectrum resources while still guara...

X Gelabert, O Sallent, J Pérez-Romero, R Agustí (2009) Communications, 2009. ICC ’09. IEEE International Conference on 1-6

Operating Point Selection for Primary and Secondary Users in Cognitive Radio Networks

2010-01-21T11:15:46Z

This paper addresses the problem of opportunistic access of secondary users to licensed spectrum in cognitive radio networks. In order to avoid interference to the licensed primary users, efficient spectrum detection methods need to be developed. For this purpose, in recent years several sensing techniques have been proposed to monitor and regulate the spectrum access to the shared spectrum resour...

X. Gelabert, I. F. Akyildiz, O. Sallent and R. Agustí (2009) Computer Networks (Elsevier) 53: 8 1158-1170

Radio resource management for heterogeneous wireless access networks

2010-01-21T11:17:28Z

J. Pérez-Romero, X. Gelabert, O. Sallent (2009) Heterogeneous Wireless Access Networks - Architectures and Protocols 460 pp.

Radio Access Congestion in Multiaccess/Multiservice Wireless Networks

2010-01-21T11:16:55Z

This work addresses the problem of radio access congestion control and resource allocation in scenarios where multiple available radio access technologies (RATs) support a wide range of services over a given coverage area. A key issue in these networks is selecting the most appropriate RAT at a call/session establishment according to some specified user/operator criteria. In this sense, a wide ran...

X Gelabert, O Sallent, J Pérez-Romero, R Agustí (2009) Vehicular Technology, IEEE Transactions on 58: 8 4462-4475

Evaluation of Radio Access Congestion in Heterogeneous Wireless Access Networks

2010-01-21T11:21:42Z

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí (2008) IEEE Global Communications Conference (IEEE GLOBECOM 2008)

Erlang Capacity Degradation in Multi-Access/Multi-service Wireless Networks due to Terminal/Coverage Restrictions

2010-01-21T11:30:53Z

The benefits of jointly managing the combined radio resources offered by heterogeneous networks consisting of several Radio Access Technologies (RATs) have been profusely studied and assessed in recent years. Nevertheless, most of the existing work assumes scenarios where all RATs are accessible (provided the RAT is not at full capacity) to all users demanding service. If this is so, the obtained ...

X. Gelabert, O. Sallent, J. Pérez-Romero, R. Agustí (2008) 11th Int. Symposium on Wireless Personal Multimedia Communications (WPMC'08)

A Novel Framework for the Characterization of Dynamic Spectrum Access Scenarios (Invited Paper)

2010-01-21T11:31:15Z

An efficient and utmost utilization of radio spectrum resources has stimulated the introduction of what has been termed dynamic spectrum access methodologies and implementations. While the traditional approach has been based on licensed (or primary) spectrum access, this new communication paradigm enables an opportunistic secondary access to shared spectrum resources provided mutual interference i...

J. Pérez-Romero, X. Gelabert, O. Sallent, R. Agustí (2008) Proc. of the 19th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications 2008 (PIMRC'08)

A Markovian Approach to Radio Access Technology Selection in Heterogeneous Multiaccess/Multiservice Wireless Networks

2008-09-11T00:13:41Z

This paper addresses the problem of Radio Access Technology (RAT) selection in heterogeneous multi-access/multi-service scenarios. For such purpose, a Markov model is proposed to compare the performance of various RAT selection policies within these scenarios. The novelty of the approach resides in the embedded definition of the aforementioned RAT selection policies within the Markov chain. In add...

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí (2008) IEEE Transactions on Mobile Computing 7: 10 1257-1270

Gestión Integrada de Redes de Acceso Radio Celulares 2G, 2.5G y 3G [in Spanish]

2010-01-21T11:32:05Z

Common Radio Resource Management (CRRM) represents a key functionality in heterogeneous Beyond 3G scenarios where several radio access technologies coexist. In this context, this paper presents a general CRRM functional model, accompanied by different splits of functionalities between the involved entities. This paper also introduces several principles for the Radio Access Technology (RAT) selecti...

O. Sallent, J. Pérez-Romero, X. Gelabert, J. Nasreddine, R. Agustí, F. Casadevall, A. Umbert, J. Olmos (2007) XXII Simpósium Nacional de la Unión Científica Internacional de Radio de 2007, URSI2007

On Managing Multiple Radio Access Congestion Events in B3G Scenarios

2010-01-21T11:31:37Z

Among the common radio resource management (CRRM) functions that are responsible for the proper allocation of resources in a multi-access network, congestion control is the one devoted to overcome potential QoS failures due to the inherent dynamics of the network. In this paper we address the problem of congestion control in a scenario considering the GSM/EDGE radio access network (GERAN) and the ...

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí (2007) Proc. 65th Semi-annual IEEE Vehicular Technology Conference Spring (VTC-Spring'07)

A 4-Dimensional Markov Model for the Evaluation of Radio Access Technology Selection Strategies in Multiservice Scenarios

2010-01-21T11:33:24Z

In order to support the conceptual development of Common Radio Resource Management (CRRM) algorithms, this paper provides an analytical approach to the performance evaluation of Radio Access Technology (RAT) selection procedures in a multi-RAT/multiservice environment. In particular, a 4-Dimensional (4D) Markovian model is devised so as to consider the allocation of voice and data services in a GE...

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí (2006) Proc. 64th Semi-annual IEEE Vehicular Technology Conference Fall (VTC-Fall'06)

Congestion Control Strategies in Multi-Access Networks

2010-01-21T11:32:59Z

This paper addresses the problematic of congestion control in the radio access interface when considering the allocation of voice and data services over several radio access technologies (RATs). In particular, the GSM/EDGE radio access network (GERAN) and the UMTS terrestrial radio access network (UTRAN) are considered for the evaluation of congestion control strategies. After a congestion situati...

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí (2006) 3rd International Symposium of Wireless Communication Systems (ISWCS 06)

Radio Resource Management in Heterogeneous Networks

2010-01-21T11:33:48Z

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí, F. Casadevall (2005) Proceedings of the International Working Conference on Performance Modelling and Evaluation of Heterogeneous Networks (HET-NETs’05)

On the Impact of Multimode Terminals in Heterogeneous Wireless Access Networks

2010-01-21T11:34:19Z

Beyond 3G (B3G) networks will encompass, among other features, a wide range of radio access technologies (RATs) providing users with a flexible and efficient access to the increasing pool of demanding services. This will allow users to get connected using the access technology that is most suitable according to some specified criteria. Consequently, to take full advantage of B3G networks, mobile t...

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí, (2005) Second International Symposium of Wireless Communication Systems 2005 (ISWCS’05) 39- 43

On the Suitability of Load Balancing Principles in Heterogeneous Wireless Access Networks

2010-01-21T11:37:48Z

Initial RAT selection is a key Common RRM strategy, where users requiring service are to be efficiently allocated in the existing and available RATs. Although load balancing is a possible guiding allocation principle, sometimes it may not be convenient. This paper evaluates and compares a load balancing and a service-class RAT selection policy in order to discuss the suitability of the former in s...

X. Gelabert, J. Pérez-Romero, O. Sallent, R. Agustí (2005) Int. Symposium on Wireless Personal Multimedia Communications (WPMC’05)

Synchronization Strategies in STDMA Tactical Radio Access Networks

2008-09-11T00:51:51Z

Future military tactical communication networks must be highly mobile, survivable and recongurable. Distributed multi-hop packet radio architectures have been adopted, combining robustness and autonomous operation. In order to meet the requirements for Quality of Service (QoS) and delay guarantees, Spatial Time Division Multiple Access (STDMA) schemes have been proposed. Key problems in STDMA are:...

X. Gelabert (2003)