Seyed Vahid Azhari,
Assistant Professor

Work Address: School of Computer Engineering, Iran University of Science & Technology, Hengam Rd., Narmak, Tehran, Iran

Work: +98-21-7322-5334
Cell: +98-912-811-0125
Skype: seyed.vahid.azhari
Email: azharivs@iust.ac.ir

PhD, Electrical and Computer Engineering                                   Sept. 2003 - Dec. 2007
McMaster University, Hamilton, ON, Canada
Dissertation Topic: Vertical Handoff from WLAN to Cellular Networks
Supervisor: Dr. Terence D. Todd

MSc, Computer Architecture Engineering                                                     2000 - 2003
University of Tehran, Tehran, Iran
Thesis Topic: Design of an ATM Switch Scheduler
Supervisor: Dr. Nasser Yazdani

BSc, Computer Hardware Engineering                                                          1996 - 2000
Iran University of Science & Technology, Tehran, Iran

Performance Evaluation
Virtualization and could computing
Telecommunication Networks
IPTV Technology
Internet of Things
SIP networks, VoIP, Next Generation Networks, and the IP Multimedia Subsystem
Small cells
Telecom billing and charging systems
Radio Frequency Identification technology

1st rank in Iranian nation-wide MSc program entrance exam for Computer Engineering (2000)
1st rank in university during BSc (1996-2000)

QoS-Aware Resource Allocation for MIMO Based IEEE802.11ac Technologies:
With the objective of providing statistical delay guarantees for video traffic over emerging IEEE802.11ac technology, an adaptive frame aggregation algorithm for scheduling of links over fading MIMO channels was proposed, simulated, developed and tested. This project was funded by TUBITAK-2221 grant from the government of Turkey upon approval of a joint research proposal and was executed under the supervision of Dr. Ozgur Gurbuz and Ozgur Ercetin of Sabanci University.

Service Instrumentation for the Cloud-Edge Paradigm (New):
The objective of this research project is to establish a framework for instrumenting services as a whole in the context of cloud and edge services, which are becoming prevalent in today’s internet driven mobile applications. The idea is to establish a foundation that will integrate various events collected from a distributed system spanning both (embedded) edge devices as well as virtual machines hosted in the cloud to create a collective knowledge of the service performance. Data analytics techniques and Machine Learning approaches will be extensively used to create this landscape. Recently, cooperation with Ecole Polytechnique de Montreal has been established with regards to this project.

Energy Efficient Wireless Mesh Networks (Concluded):
Developing energy and lifetime aware routing and traffic distribution algorithms for wireless mesh networks. Our focus was to develop practical solutions for current IEEE802.11 based networks using distributed sleep coordination and duty cycle control.

Load Control in SIP Networks (Concluded):
The objective is to provide carrier grade service in face of signaling load spikes, load abnormalities and DoS attacks in SIP networks. We have developed a comprehensive SIP testbed and proposed many load control schemes. All of our schemes are implemented and tested on our testbed. We have also developed a control theoretic framework for studying stability of SIP signaling networks, which is also leveraged in our testbed.

Embedded Linux Systems Development (Concluded):
Supervising a team working on embedded Linux systems. Specifically, we have made a multi-radio IEEE 802.11 access point using open source software and off the shelf hardware as part of our WMN testbed.

Mobility Management in Next Generation Networks (Concluded):
As a joint project with Iran Telecommunications Research Center, we developed a testbed for bench-marking various types of mobility in the IP Multimedia Subsystem. The project attracted 120000 USD to the department.

1. Todd, Terence D., and Seyed Vahid Azhari. "WLAN-to-WWAN handover methods and apparatus using a WLAN support node having a WWAN interface." U.S. Patent 8,095,175, issued January 10, 2012.
2. Barghi, Hadi, and Azhari, Seyed Vahid, A practical sleep coordination and management scheme with duty cycle control for energy sustainable IEEE 802.11s wireless mesh networks, Wireless Networks (2018). https://doi.org/10.1007/s11276-018-1683-6
3. Azhari, S.V., Baghdadi, M., Enayatizadeh, J., “Local and Distributed SIP Overload Control Solution Improving Sustainability of SIP Networks”, Wiley International Journal of Communication Systems,  Vol. 30 No.6 (2017).
4. Mojtaba Jahanbakhsh, Seyed Vahid Azhari, Hani Nemati, Lyapunov Stability of SIP Systems and Its Application to Overload Control, Computer Communications, Available online 30 January 2017, ISSN 0140-3664
5. MalekpourShahraki, Mojtaba, Hadi Barghi, Seyed Vahid Azhari, and Saeed Asaiyan. "Distributed and Energy Efficient Scheduling for IEEE802. 11s Wireless EDCA Networks." Wireless Personal Communications 90, no. 1 (2016): 301-323.
6. Memis, Mehmet Ozerk, Ozgur Ercetin, Ozgur Gurbuz, and Seyed Vahid Azhari. "Resource allocation for statistical QoS guarantees in MIMO cellular networks." EURASIP Journal on Wireless Communications and Networking 2015, no. 1 (2015): 217.
7. Nassiri, Mohammad, Mohammad Boujari, and Seyed Vahid Azhari. "Energy-aware and load-balanced parent selection in RPL routing for wireless sensor networks." International Journal of Wireless and Mobile Computing 9, no. 3 (2015): 231-239.
8. Azhari, Seyed Vahid, Niloofar Afshari, and Mohammad Nassiri. "Novel Lifetime Routing Metric for IEEE 802.11 Wireless Mesh Networks.", International Journal of Ad Hoc and Ubiquitous Computing, Accepted
9. Asyabi, Esmail, Azadeh Azhdari, Mostafa Dehsangi, Michel Gokan Khan, Mohsen Sharifi, and Sayed Vahid Azhari. "Kani: a QoS-aware hypervisor-level scheduler for cloud computing environments." Cluster Computing 19, no. 2 (2016): 567-583.
10. Shams, S., Jahed-Motlagh, M., Azhari, S.V., “Robust decentralized adaptive non-quadratic congestion control algorithm for a class of delayed networks”, Springer Nonlinear Dynamics 73(4): 2291-2311 (2013)
11. Azhari, S. V., Homayouni, M., Nemati, H., Enayatizadeh, J., Akbari, A., “Overload control in SIP networks using no explicit feedback: A window based approach”, Elsevier Computer Communications Journal 35(12): 1472-1483 (2012)
12. Smadi M, Azhari V., Todd T.D., Kezys V.,”A Study of WLAN to Cellular Handover Using Measured Building Exit Data”, IEEE Transactions on Vehicular Technology, May 2009
13. Azhari S.V., Smadi M, Todd T.D., “Fast WLAN/Cellular connection recovery for soft WLAN-to-Cellular vertical handoff", IEEE Transactions on Vehicular Technology, March 2008

1. Azhari, Seyed Vahid, Ozgur Gurbuz, and Ozgur Ercetin. "QoS based aggregation in high speed IEEE802. 11 wireless networks." In Ad Hoc Networking Workshop (Med-Hoc-Net), 2016 Mediterranean, pp. 1-7. IEEE, 2016.
2. Dehsangi, Mostafa, Esmail Asyabi, Mohsen Sharifi, and Seyed Vahid Azhari. "cCluster: a core clustering mechanism for workload-aware virtual machine scheduling." In Future Internet of Things and Cloud (FiCloud), 2015 3rd International Conference on, pp. 248-255. IEEE, 2015.
3. Nemati, H., Azhari, S. V., “Stability Analysis of Tandem SIP Proxies “, IEEE ICC 2012, Ottawa, ON, Canada
4. Homayouni, M., Nemati, H., Azhari, S. V., Akbari, A., “Controlling Overload in SIP Proxies: An Implicit Feedback Adaptive Window Based Approach”, IEEE GLOBECOM 2010 December 2010 Miami, Florida, USA.
5. Nemati, H., Azhari, S. V., Smadi, M. N., Todd, T. D., “Trigger Node Assisted WLAN to Cellular Vertical Handover”, IEEE Vehicular Technology Conference Fall 2010, Ottawa, Ontario, Canada.
6. Homayouni, M., Jahanbakhsh, M., Azhari, V., Akbari, A., “Overload control in SIP servers: Evaluation and improvement”, 2010 IEEE 17th International Conference on Telecommunications (ICT), 4-7 April 2010, Doha, Qatar
7. Homayouni, M., Azhari, S.V., Jahanbakhsh, M., Akbari, A., Mansoori, A., Amani, N., “Configuration of a SIP Signaling Network: An Experimental Analysis”, Fifth International Joint Conference on NCM, Aug. 2009, South Korea.
8. Azhari S.V., Smadi M, Todd T.D., “The Capacity Deficit Problem in WLAN to Cellular Vertical Handoffs”, IWCMC, 2007
9. Smadi M, Azhari S.V., Todd T.D., Kezys V., “Measurement based study of WLAN to WWAN Handoffs”, IEEE International Conference on Mobile ad hoc and Sensor Systems, 2006
10. Azhari, V., Todd, T.D., “Fast connection recovery in WLAN-to-cellular vertical handoff”, IEEE International Conference on Mobile ad hoc and Sensor Systems, 2005