5 documents found, page 1 of 1
Experimental System Level Platform for B3G Scenarios
Monteiro, Valdemar; Bastos, Joaquim; Cabral, Orlando Manuel Brito; Velez, Fernando J.; Rodriguez, JonathanThis paper provides a complete specification of the packet based cellular wireless system level simulator that addresses a beyond 3G scenario involving heterogeneous wireless systems interconnected via an IP backbone network. Important aspects as the Link layer design (including the MAC layer) are specified, as well as the C++ object oriented simulation architecture. Since the IP level and the physical layer as...
Optimal load suitability based RAT selection for HSDPA and IEEE 802.11e
Cabral, Orlando; Velez, Fernando J.; Rodriguez, Jonathan; Monteiro, Valdemar; Gameiro, Atilio; Prasad, Neeli R.Networks of the future envisage a network-of-wireless networks that provide the end user the means to connect to the best available network at anytime and at any place. However, equally challenging for the operators is to provide these services at low cost in an era where spectral resources are a premium. This paper investigates cooperation between networks based Radio Access Technology (RAT) selection algorith...
HSDPA/WiFi RAT Selection Based on Load Suitability
Monteiro, Valdemar; Cabral, Orlando; Rodriguez, Jonathan; Velez, Fernando José; Gameiro, AtílioRadio access technologies (RATs) selection algorithms have been studied in the literature and nowadays equipment with several RATs incorporated into it is already common. The major goal of this work is to measure the gain obtained by using WiFi as a backup network for HSDPA, allowing for preventing from quality of service (QoS) deterioration when in a low mobility scenario. Since IEEE 802.11e already supports Q...
Highlights from the Workshop Pervasive Broadband Wireless Access: Toward Long-T...
Velez, Fernando J.; Cabral, Orlando Manuel Brito; Monteiro, Valdemar; Rodriguez, JonathanThe Final Workshop of the CROSSNET (Cross-Layer Design and Network Planning for B3G Systems, http://www.e-projects.ubi.pt/crossnet/) project took place on February 19, 2008, at Instituto de Telecomunicações, Portugal. There were 133 participants, 31 percent from academia, 22 percent from R&D laboratories, 15 percent from telecommunication services and maintenance, 11 percent from manufacturers, 11 percent from ...
Simulador de comunicação com modulação Spread Spectrum
Monteiro, Valdemar; Matos, João NunoIn this paper we present the description of the design of a spread spectrum communication simulator to analyse the system performance. The Spread Spectrum system that will be simulated is the CDMA - DS/SS BPSK. The performance will be evaluated by the probability of biterror in the communication simulation.; Neste artigo descreve-se a construção de um simulador de comunicações com modulação Spread Spectrum...