Enviaments recents

  • On the performance of the DQRUMA with different scheduling algorithms for multimedia traffic in an indoor environment for W-ATM networks 

    Verikoukis, Christos; Olmos Bonafé, Juan José (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    The performance of the DQRUMA MAC protocol for multimedia traffic in a realistic indoor environment using the guarantee bandwidth minimising delay (GBMD) scheduling policy is evaluated by simulations. The efficiency of the ...
  • A generic radio channel emulator to evaluate higher layer protocols in a CDMA system 

    Umbert Juliana, Anna; Díaz Romero, M. del Pilar (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    Currently, we are involved in the standardisation process to specify the next mobile system generation. A wideband code division multiple access (WCDMA) system is considered in most of the region versions. It would be very ...
  • Chip level simulation of the downlink in UTRA-FDD 

    Olmos Bonafé, Juan José; Ruiz Boqué, Sílvia (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    The specifications of UMTS Terrestrial Radio Access (UTRA) for the physical layer of the downlink make use of orthogonal variable spreading factor (OVSF) codes to preserve the orthogonality between downlink channels of ...
  • A combined polling and ISMA-DS/CDMA protocol to provide QoS in packet mobile communications systems 

    Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, José Oriol (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    This paper presents a new mechanism that combines the flexibility of an access protocol such as ISMA-DS/CDMA with the ability of a polling mechanism to provide a specific bound for the access delay. This protocol is proposed ...
  • An implementation of UTRAN for WINEGLASS access network emulator 

    Badini, F; SCARRONE, E; Kuehn, E; Casadevall Palacio, Fernando José; Agustí Comes, Ramon (European Commission, 2000)
    Text en actes de congrés
    Accés obert
    3G systems are designed for support of a brand new set of services (like location based services) thus, the capability to evaluate their provision in the laboratory is mandatory for their deployment. The IST WINEGLASS ...
  • Issues on packet transmissioin strategies in a TDD-TD/CDMA scenario 

    Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, José Oriol; Casadevall Palacio, Fernando José (European Commission, 2000)
    Text en actes de congrés
    Accés obert
    This paper presents a packet transmission scheme that deals with the problems of a TDD CDMA scenario with different levels of frame structure asymmetry in adjacent base stations by distributing the users in the slots ...
  • Wireless internet architecture and testbed for wineglass 

    Recker, S; Casadevall Palacio, Fernando José; Drögehorn, O; Heinrichs, B; Lanch, H Y; SCARRONE, E; Schreyer, O; Waldow, P (European Commission, 2000)
    Text en actes de congrés
    Accés obert
    One of the most challenging issues in the area of mobile communication is the deployment of IPbased wireless multimedia networks in public and business environments. The public branch may involve public mobile networks, ...
  • ISMA-DS/CDMA MAC protocol for mobile packet radio networks 

    Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, José Oriol (--, 1999)
    Text en actes de congrés
    Accés obert
    In this paper an ISMA-DS/CDMA MAC protocol for a packet transmission network is presented. The main feature of this protocol is its ability to retain the inherent flexibility of random access protocols while at the same ...
  • Performance analysis of an ISMA DS-CDMA packet data network 

    Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, José Oriol (Institute of Electrical and Electronics Engineers (IEEE), 1999)
    Text en actes de congrés
    Accés obert
    The efficiency of MAC protocols for a packet switching DS-CDMA network strongly depends on the offered traffic statistic. For bursty sources where transmission needs are restricted to short message lengths, a protocol such ...
  • Protocols to enhance tcp performance on mobile systems 

    Díaz Romero, M. del Pilar; Airlie, David; Casadevall Palacio, Fernando José; Nelson, John (1999)
    Text en actes de congrés
    Accés obert

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