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dc.contributor.authorSallent Roig, José Oriol
dc.contributor.authorAgustí Comes, Ramon
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.identifier.citationSallent Roig, J.O; Agustí Comes, R. Adaptive S-ALOHA CDMA as an alternative way of integrating services in mobile environments. IEEE Transactions on Vehicular Technology, 2000, vol. 49, núm. 3, pàg. 936-947
dc.description.abstractCode-division multiple-access (CDMA) schemes appear to be very promising access techniques for coping with the requirements of third-generation mobile systems, mainly because of their flexibility. This paper proposes an adaptive S-ALOHA DS-CDMA access scheme as a method for integrating nonreal-time (i.e., Internet applications) and real-time (i.e., voice) services in a multicell scenario by exploiting the potentials of CDMA under time-varying channel load conditions. The adaptive component makes data terminals autonomously change their transmission rate according to the total (voice+data) channel occupancy, so that the minimum possible data delay, which can be analytically obtained by defining a birth-death process, is almost always achieved. Moreover, by means of a simplified cellular model, the proposed algorithm revealed the same behavior, i.e., it tries to select the most suitable transmission rate at any time slot, when it is affected by intercell interference and even by power control imperfections. Finally, in order to gain more insight into the potentials of such an access strategy, the adaptive S-ALOHA CDMA scheme is then compared to a reservation time-division multiple-access (TDMA)-based protocol (PRMA++), showing the benefits of the CDMA-based solution in terms of capacity, flexibility, and data delay performance.
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils
dc.subject.lcshMobile communication systems
dc.subject.otherAdaptive systems
dc.subject.otherAdaptive S-ALOHA DS-CDMA
dc.subject.otherBirth-death process
dc.subject.otherCellular model
dc.subject.otherCellular radio
dc.subject.otherChannel occupancy
dc.subject.otherCode division multiple access
dc.subject.otherData delay performance
dc.subject.otherData terminals
dc.subject.otherIntegrated voice/data communication
dc.subject.otherIntercell interference
dc.subject.otherMobile environments
dc.subject.otherMulticell system
dc.subject.otherMultiuser channels
dc.subject.otherNonreal-time services
dc.subject.otherPacket reservation multiple access
dc.subject.otherPower control imperfections
dc.subject.otherRadiofrequency interference
dc.subject.otherReal-time services
dc.subject.otherReservation time-division multiple-access
dc.subject.otherServices integration
dc.subject.otherTDMA-based protocol
dc.subject.otherTelecommunication services
dc.subject.otherThird-generation mobile systems
dc.subject.otherTime division multiple access
dc.subject.otherTime-varying channel load
dc.subject.otherTransmission rate
dc.subject.otherVoice services
dc.titleAdaptive S-ALOHA CDMA as an alternative way of integrating services in mobile environments
dc.subject.lemacSistemes de comunicacions mòbils
dc.contributor.groupUniversitat Politècnica de Catalunya. GRCM - Grup de Recerca en Comunicacions Mòbils
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access

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