Performance Modeling of Wireless Voice over IP

  • Abhishek Roy
  • Kalyan Basu
  • Sajal K. Das
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2571)


The recent popularity of voice over IP (VoIP) services in the Internet world lies in the fact that in VoIP, voice packets are carried over the shared packet-switched network (the Internet) rather than on dedicated circuit-switched telephony network. This phenomenon reduces the cost of carrying the voice packets substantially. We propose that the concept of VoIP over wireless GPRS (General Packet Radio Service) also reduces the complexity of the GSM/GPRS architecture. Currently, the existing GSM (Global System for Mobile Communications) network carries the voice packets in the air link and converts it to circuit-switched PCM (Pulse Code Modulation) signal by using the voice transcoder. A 64 Kbps circuit-switched connection is then established through the existing PSTN (Public Switch Telephone Network). Wireless data packets on the other hand, share the same physical air link, but are carried through the GPRS packet-switched network. If we carry the voice on the same packet-switched network rather than on a separate circuit-switched network, then integration of data and voice would alleviate the necessity of circuit-switched components. However, maintaining the voice quality offers significant challenges. In this paper we propose a method of implementing the VoIP in GPRS network using H.323 protocol, and also identify the additional architecture requirements that will address some of the performance impediments of current GPRS VoIP implementation. The performance results for control message signals demonstrate the possibility of maintaining call set-up delay within the current delay standards. Analytical modeling of the voice traffic shows that significant improvements in terms of voice traffic capacity is possible with the help of a silent-detection scheme.


Medium Access Control Session Initiation Protocol Voice Quality Frame Error Rate General Packet Radio Service 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    G. Bao, “Performance Evaluation of TCP/IP Protocol Stack over CDMA Wireless Link”, Wireless Networks, Vol.3, No. 2, pp. 229–237, 1996.CrossRefGoogle Scholar
  2. 2.
    A. T. Campbell, J. Gomez, S. Kim, A. G. Valko, C.-Y. Wan and Z. R. Turáni, “Design, implementation and evaluation of Cellular IP,” IEEE Personal Communications, vol. 7, no. 4, August 2000, pp. 42–49.CrossRefGoogle Scholar
  3. 3.
    S. K. Das, E. Lee, K. Basu, N. Kakani and S. Sen, “Performance Optimization of VoIP Calls Over Wireless Links Using H.323 Protocol”, IEEE INFOCOM, Vol. 3, pp. 1386–1394, 2002.Google Scholar
  4. 4.
    S. Das, A. McAuley, A. Dutta, A. Misra, K. Chakraborty and S. K. Das, “IDMP: An Intra-domain Mobility Management Protocol for Next Generation Wireless Networks,” IEEE PCS, Spl. Issue on Mobile and Wireless Internet: Architectures and Protocols, 2002.Google Scholar
  5. 9.
    T. Kwon, M. Gerla, S. Das, and S. K. Das, “Mobility Management for VoIP Service: Mobile IP vs. SIP,” IEEE Wireless Communications (Special Issue on IP Multimedia in Next Generation Mobile Networks, Guest Eds: S. Apostolis and L. Merakos), Oct 2002.Google Scholar
  6. 10.
    A. Lakaniemi and J. Parantainenj, “On Voice Quality of IP Voice over GPRS”, IEEE International Conference on Multimedia, ICME, vol. 2, 2000.Google Scholar
  7. 11.
    R. Ramjee, T. F. La Porta, L. Salgarelli, S. Thuel, K. Varadhan and L. Li, “IPbased access network infrastructure for next-generation wireless data networks,” IEEE Personal Communications, vol. 7, no. 4, August 2000, pp. 34–41.CrossRefGoogle Scholar
  8. 12.
    M. Handley et al., “SIP: Session Initiation Protocol”, RFC 2543 Internet Engineering Task Force, March, 1999.Google Scholar
  9. 13.
    S. K. Sen, J. Jawanda, K. Basu, N. K. Kakani and S. K. Das, “A Call Admission Control Scheme for TCP/IP based CDMA Voice/Data Networks”, ACM International Conference on Mobile Computing and Networking (MobiCom), pp. 276–283, Dallas, 1998.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Abhishek Roy
    • 1
  • Kalyan Basu
    • 1
  • Sajal K. Das
    • 1
  1. 1.CReWMaN Lab Dept of Computer Science and EngineeringUniversity of Texas at ArlingtonArlingtonUSA

Personalised recommendations