This Article 
 Bibliographic References 
 Add to: 
Optimization of SIP Session Setup Delay for VoIP in 3G Wireless Networks
September 2006 (vol. 5 no. 9)
pp. 1121-1132
Wireless networks beyond 2G aim at supporting real-time applications such as VoIP. Before a user can start a VoIP session, the end-user terminal has to establish the session using signaling protocols such as H.323 and session initiation protocol (SIP) in order to negotiate media parameters. The time interval to perform the session setup is called the session setup time. It can be affected by the quality of the wireless link, measured in terms of frame error rate (FER), which can result in retransmissions of packets lost and can lengthen the session setup time. Therefore, such protocols should have a session setup time optimized against loss. One way to do so is by choosing the appropriate retransmission timer and the underlying protocols. In this paper, we focus on SIP session setup delay and propose optimizing it using an adaptive retransmission timer. We also evaluate SIP session setup performances with various underlying protocols (transport control protocol (TCP), user datagram protocol (UDP), radio link protocols (RLPs)) as a function of the FER. For 19.2 Kbps channel, the SIP session setup time can be up to 6.12s with UDP and 7s with TCP when the FER is up to 10 percent. The use of RLP (1, 2, 3) and RLP (1, 1, 1, 1, 1, 1) puts the session setup time down to 3.4s under UDP and 4s under TCP for the same FER and the same channel bandwidth. We also compare SIP and H.323 performances using an adaptive retransmission timer: SIP outperforms H.323, especially for a FER higher than 2 percent.

[1] U. Black, Voice Over IP. Prentice Hall, 2000.
[2] 3GPP, “Technical Specification Group Services and System Aspects; Network Architecture (Release 5),” Technical Report TS23.002, 3GPP, Mar. 2002.
[3] S. Das, E. Lee, K. Basu, and S. Sen, “Performance Optimization of VoIP Calls over Wireless Links Using H.323 Protocol,” IEEE Trans. Computers, vol. 52, no. 6, pp. 742-752, June 2003.
[4] 3GPP2, “Data Service Options For Spread Spectrum Systems: Radio Link Protocol Type 3,” Technical Report C.S0017-010-A, June 2004.
[5] J. Rosenberg, H. Schulzrinne, G. Camarillo, J. Peterson, R. Sparks, M. Handley, and E. Schooler, “SIP: Session Initiation Protocol,” RFC 3261 IETF, June 2002.
[6] B. Goode, “Voice over Internet Protocol (VoIP),” Proc. IEEE, vol. 90, no. 9, 2002.
[7] A. Valko, A. Racz, and G. Fodor, “VoIP QoS in Third-Generation Mobile Systems,” IEEE J. Selected Areas in Comm., vol. 17, no. 1, Jan. 1999.
[8] T.S.S. of ITU, “ITU-T Recommendation E. 721— Network Grade of Service Parameters and Target Values for Circuit-Switched Services in the Evolving ISDN,” 1991.
[9] T. Eyers and H. Schulzrinne, “Predicting Internet Telephony Call Setup Delay,” Proc. First IP Telephony Workshop, Apr. 2000.
[10] A. Kist and R.J. Harris, “SIP Signaling Delay in 3GPP,” Proc. Sixth Int'l Symp. Comm. Interworking, pp. 211-222, 2002.
[11] J. Harris and M. Airy, “Analytical Model for Radio Link Protocol for IS-95 CDMA Systems,” Proc. IEEE Vehicular Technology Conf., vol. 3, pp. 2434-2438, 2000.
[12] G. Bao, “Performance Evaluation of TCP/RLP Protocol Stack over CDMA Wireless Link,” IEEE Wireless Networks, vol. 3, no. 2, pp. 229-237, 1996.
[13] O. Hersent, D. Gurle, and J. Petit, IP Telephony, Packet-Based Multimedia Communications Systems. Addison-Wesley, 2000.
[14] F. Khan, S. Kumar, K. Medepalli, and S. Nanda, “TCP Performance over CDMA200 RLP,” Proc. IEEE Vehicular Technology Conf., pp. 41-45, 2000.
[15] L. Kleinrock, Queuing Systems, Vol. 1: Theory. Wiley, 1975.
[16] R. Stevens, TCP/IP Illustrated, vol. 1. Addison-Wesley, 1994.
[17] Ethereal, http:/, 2006.
[18] R. Price et al. “Signaling Compression,” RFC 3320, Jan. 2003.
[19] IETF, “Text-Based Compression Using Cache and Blank Approach,” Internet Draft, July 2001.
[20] G. Foster, M.I. Pous, D. Pesch, A. Sesmun, and V. Kenneally, “Performance Estimation of Efficient UMTS Packet Voice Call Control,” Proc. IEEE Vehicular Technology Conf., vol. 3, pp. 1447-1451, Sept. 2002.
[21] M. Kaneko, H. Fathi, and I. Kovacs, “Optimization of Simultaneous VoIP Users in UMTS,” technical report, Aalborg Univ., 2004.

Index Terms:
IP-based wireless networks, SIP, session setup delay, TCP, UDP, RLP, H.323, signaling performance.
Hanane Fathi, Shyam S. Chakraborty, Ramjee Prasad, "Optimization of SIP Session Setup Delay for VoIP in 3G Wireless Networks," IEEE Transactions on Mobile Computing, vol. 5, no. 9, pp. 1121-1132, Sept. 2006, doi:10.1109/TMC.2006.135
Usage of this product signifies your acceptance of the Terms of Use.