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Research Article | Open | Published:

Voice and Video Telephony Services in Smartphone

Abstract

Multimedia telephony is a delay-sensitive application. Packet losses, relatively less critical than delay, are allowed up to a certain threshold. They represent the QoS constraints that have to be respected to guarantee the operation of the telephony service and user satisfaction. In this work we introduce a new smartphone architecture characterized by two process levels called application processor (AP) and mobile termination (MT), respectively. Here, they communicate through a serial channel. Moreover, we focus our attention on two very important UMTS services: voice and video telephony. Through a simulation study the impact of voice and video telephony is evaluated on the structure considered using the protocols known at this moment to realize voice and video telephony

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References

  1. 1.

    Ali RB, Pierre S, Lemieux Y: UMTS-to-IP QoS mapping for voice and video telephony services. IEEE Network 2005,19(2):26-32. 10.1109/MNET.2005.1407695

  2. 2.

    Maniatis I, Nikolouzou G, Venieris S: QoS issues in the converged 3G wireless and wired networks. IEEE Communications Magazine 2002,40(8):44-53. 10.1109/MCOM.2002.1024414

  3. 3.

    http://www.camiresearch.com/Data_Com_Basics/RS232_standard.html

  4. 4.

    3GPP TS 26.110 : Codec for circuit switched multimedia telephony service; General description.

  5. 5.

    Cisco Systems : Quality of Service for VoIP. 2001, http://www.cisco.com/universcd/cc/td/doc/cisintwk/qossol/qosvoip.pdf

  6. 6.

    ITU-T H.324 Series H : Audio Visual and Multimedia System Infrastructure of audiovisual service—System and terminal equipment for audiovisual service. Terminal for low bit rate multimedia communication.

  7. 7.

    UMTS 22.72 v 0.0.0 (1999-01) : Universal Mobile Telecommunications System (UMTS); Real-time Multimedia in UMTS.

  8. 8.

    3rd Generation Partenership Project : Technical Specication Group Service and System Aspect; code for circuit switched multimedia telephony service; modifications to H.324.

  9. 9.

    ETSI TS 127007 v 3.12.0 (2002-12) : Digital Cellular Communications System (Phase2+); Universal Mobile Telecommunication System (UMTS).

  10. 10.

    http://www.ncoretech.com/speech/pdf/g7231c54x.pdf

  11. 11.

    3G TS 26.071 v 3.0.1 (1999-08) : Generation Partnership Project; Technical Specification Group Service and System Aspects; mandatory speech codec speech processing functions AMR speech codec; General Description (3G TS 26.071 v 3.0.1).

  12. 12.

    ITU-T Reccomendation H.223 : Multoplexing Protocol for low bit rate multomedia communication.

  13. 13.

    Brady PT: A model for generating on/off speech patterns in two way conversations. Bell System Technical Journal 1969., 48:

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Author information

Correspondence to Valeria Loscri'.

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Keywords

  • Information System
  • Simulation Study
  • Packet Loss
  • System Application
  • Process Level