CHAPTER 5 CONCLUSIONS AND FUTURE WORK
5.2 F UTURE W ORK
Based on the research results of this dissertation, the following issues can be further investigated:
Videophone Service: In this dissertation, we evaluated the VoIP performance according to the packet loss, latency, and jitter of the voice streams. Base on the previous IP voice studies, we will further analyze the video performance in the IP Multimedia Core Network Subsystem (IMS) network. ITU-T Recommendation G.1070 proposed an algorithm to estimate the videophone quality [29]. However, the proposed computation model estimates the speech quality and video quality individually, which is not practical in videophone performance measurement. We will further study the video quality affected by speech quality and vice versa to estimate the performance of the videophone service.
Call Transmission Performance: In this dissertation, we focused on the VoIP services involving the endpoints in the same wireless environment. In the further study, we will study the call transmission performance that the endpoints are located in different wireless access networks; for example, one is in the WLAN and the other is in the WiMAX network. Furthermore, we are interested in the next generation 3GPP radio access network called Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) [30] and we will evaluate the call transmission performance of the VoIP services involving the endpoints in the next generation mobile network and the current wireless network.
Internet Call Server: In this dissertation, we discussed the telecom-grade call control and the security performance of the mobile wireless network. In the further study, we will investigate the service performance in a managed IP network, where the call application server is developed on the IBM WsT platform described in Chapter 1 and the mobile user connects to the Chunghwa Telecom (CHT) IMS network. We will show a telecom-grade call server implementation example using the IBM WsT
platform and evaluate the performance of the Internet call services. This study will provide a guideline for the third party service provider.
Bibliography
[1] 3GPP. 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Feasibility study on 3GPP system to Wireless Local Area Network (WLAN) interworking. Technical Specification 3GPP TR 22.934 version 9.0.0 (2009-12), 2009.
[2] 3GPP. 3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; Technical realization of Short Message Service (SMS). Technical Specification 3GPP TR 23.040 version 9.1.0 (2009-9), 2009.
[3] 3GPP. 3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; Multimedia Messaging Service (MMS); Functional description; Stage 2.
Technical Specification 3GPP TR 23.140 version 6.16.0 (2009-3), 2009.
[4] 3GPP. 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS); Stage 2. Technical Specification 3GPP TR 23.228 version 9.2.0 (2009-12), 2009.
[5] WiMAX Forum. WiMAX Forum Network Architecture (Stage 3: Detailed Protocols and Procedures), Release 1, V1.2, Jan. 2008.
[6] IBM. http://www-01.ibm.com/software/webservers/appserv/was/; WebSphere Application Server.
[7] LAN/MAN Standards Committee of the IEEE Computer Societ, IEEE Standard for Local and Metropolitan Area Networks – Port-Based Network Access Control. IEEE Std 802.1X-2001, 2001.
[8] Y.-B. Lin and I. Chlamtac, Wireless and Mobile Network Architectures. John Wiley &
Sons, Inc., 2001.
[9] Y.-B. Lin and Y.-K. Chen, Reducing Authentication Signaling Traffic in Third Generation Mobile Network. IEEE Transactions on Wireless Communications, 2002.
[10] IETF. Extensible Authentication Protocol (EAP). IETF RFC 3748, 2004.
[11] IETF. Remote Authentication Dial In User Service (RADIUS). IETF RFC 2865, 2000.
[12] A. K. Salkintzis, C. Fors, and R. Pazhyannur, WLAN-GPRS Integration for Next-generation Mobile Data Networks. IEEE Wireless Communications, 2002.
[13] K. Ahmavaara, H. Haverinen, R. Pichna, Interworking architecture between 3GPP and WLAN systems. IEEE Communications Magazine, 2003.
[14] A. K. Salkintzis, Interworking techniques and Architectures for WLAN/3G Integration toward 4G Mobile Data Networks. IEEE Wireless Communications, 2004.
[15] Y.-B. Lin and A.-C. Pang, Wireless and Mobile All-IP Networks. John Wiley & Sons, Inc., 2005.
[16] IETF. Extensible Authentication Protocol Method for GSM Subscriber Identity Modules (EAP-SIM). IETF Internet Draft draft-haverinen-pppext-eap-sim-05, June 2002.
[17] 3GPP. 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; 3G Security; Security Architecture. 3G TS 33.102, v6.2.0, 2004.
[18] L. Klenrock, Queueing Systems; Volume I: Theory. John Wiley & Sons, Inc., 1976.
[19] J. Banks, J. S. Carson, B. L. Nelson, and D. M. Nicol. Discrete-Event System Simulation.
Prentice Hall, 2001.
[20] 3GPP TS 23.234, 3GPP System to Wireless Local Area Network (WLAN) Interworking;
System Description (release 7), 3rd Generation Partnership Project (3GPP), 2006;
http://www.3gpp.org/ftp/Specs/archive/23_series/23.234/.
[21] S. Kent and R. Atkinson, “IP Encapsulating Security Payload (ESP)”, RFC 2406, Nov 1998.
[22] J. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M.
Handley, and E. Schooler, “SIP: Session Initiation Protocol”, RFC 3261, Jun. 2002.
[23] S. Casner, R. Frederick, V. Jacobson, and H. Schulzrinne, “RTP: A Transport Protocol for Real-Time Applications”, RFC 3550, Jul. 2003.
[24] A. Nascimento, A. Passito, E. Mota, E. Nascimento, and L. Carvalho, “Can I Add a Secure VoIP Call?”, Proceedings of the XIII IEEE International Conference on Networks, Volume 1, Page 151– 155, Nov. 2005.
[25] R. Rajavelsamy, V. Jeedigunta, B. Holur, M. Choudhary, and O. Song, “Performance Evaluation of VoIP over 3G-WLAN Interworking System”, IEEE Wireless Communications and Networking Conference, Volume 4, Page 2312– 2317, Mar. 2005.
[26] W. Wang, S.-C. Liew, and V.O.K. Li, “Solutions to Performance Problems in VoIP over a 802.11 Wireless LAN”, IEEE Transactions on Vehicular Technology, Volume 54, Issue 1, Page 366– 384, Jan. 2005.
[27] D.P. Hole and F.A. Tobagi, “Capacity of an IEEE 802.11b Wireless LAN Supporting VoIP”, IEEE International Conference on Communications, Volume 1, Page 196– 201, Jun. 2004.
[28] SmartVoIPQoS User Guide, http://www.spirentcom.com/documents/438.pdf
[29] ITU-T G.711 Recommendation, “Pulse Code Modulation (PCM) of Voice Frequencies”, Nov. 1988.
[30] ITU-T G.729 Recommendation, “Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP)”, Mar. 1996.
[31] ANSI X9.52-1998, “Triple Data Encryption Algorithm Modes of Operation”, American National Standard Institute, 1998.
[32] FIPS 180-1, “Secure Hash Standard”, National Institute of Standards and Technology, US Department of Commerce, Washington DC: Springer-Verlag, April 1995.
[33] NTT Communications, http://www.ntt.com/index-e.html
[34] Y.-B. Lin, “Keynote Speech on M-Taiwan: A WiMAX Experience”, Mobility 2008 Conference, I-Lan, Taiwan, 9-12 September, 2008.
[35] MOEA, 2008 WiMAX Expo, Taipei & WiMAX Operator Summit, June 2-6, 2008. See also http://wimaxtaipei.tw/.
[36] IETF. “SDP: Session Description Protocol”, RFC 4566, Jul. 2006.
[37] ITU-T. The E-model, a Computational Model for Use in Transmission Planning, ITU-T Recommendation G.107, 2003.
[38] H. F. Rashvand, Lecture Notes for ES433 & ES9R8, Wireless Communication Systems, University of Warwick.
[39] H. F. Rashvand, Special Guest Speaker, WiMAX Cybercity & Next Generation Networks, Mobility 2008, Ilan, Taiwan, 9-12 September, 2008.
[40] Y.-C. Sung and Y.-B. Lin, IPsec-based VoIP Performance in the WLAN Environment, IEEE Internet Computing, 2008.
[41] D. P. Hol and F. A. Tobagi, Capacity of an IEEE 802.11b Wireless LAN Supporting VoIP, IEEE International Conference on Communications, Volume 1, pps.196– 201, Jun.
2004.
[42] NetIQ, Performing a VoIP Assessment with Vivinet Assessor, White Paper, NetIQ, 2007.
Curriculum Vitae
Ya-Chin Sung received the B.S. and the M.S. degrees from National Chiao