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1. Survivable and
Availability-Constrained Routing in Wired Communication
Networks
I am very
interested in developing survivable routing algorithms and
availability-aware routing algorithms, through SBPP, p-cycle,
and ring-cover, etc. The related research efforts based on
optimization techniques, such as Integer Linear
Programming, are extensively exercised.
2. Service-Oriented Wireless
Metropolitan-Area Networks (WMANs)
I have been interested in and
addressing a significant amount of efforts on developing new
network architectures, protocols, and algorithms based on
industry standards that can be practically launched and
implemented in the commercial carried networks. The following
three topics have been investigated:
(1)
System Design and Analysis for IEEE 802.16 Networks
IEEE 802.16, also known as
WiMax, is envisioned to become the future WMAN backbone, and
has been extensively investigated by industry and academia
since the first draft of IEEE standard came up in 2004. I have
actively involved in and working closely with my students on
the related topics around WiMax system design and analysis,
such as connection admission control, scheduling, performance
analysis on various system arrangements, and broadcasting with
layered superposition coding in WiMax for supporting real-time
video services.
(2)
Security and privacy preserving in Wireless Mesh Networks (WMNs) and Vehicular
ad hoc Networks (VANETs)
Security and privacy
preservation are challenging issues in the design of WMANs,
where WMNs and VANETs are two types of networks of my strong
interest. In the area of WMNs, I am particularly working on
localized authentication with compromise resilience, and
privacy-preserving billing architectures for inter-domain
roaming on Public Key Infrastructure (PKI). This problem
becomes very important when handover events occur frequently,
which is the case in the future metropolitan-area WMNs with
small-coverage and compromise-prone access points. Motivated
by this, we have addressed significant efforts and come up
with a novel framework of compromise resilience and privacy
preservation for user authentication and billing, which is
believed the pioneer studies in the related areas. This study
is expected to impose fundamental impacts on the related
studies and research community.
For the topic of VANETs, we
have come up with new security architectures for achieving
partial anonymity using Group signature and Ring signature,
according to IEEE 802.11p and
the Dedicated Short Range
Communications (DSRC) standard
evaluated in the
Vehicle Safety Communications (VSC) project in USA. Meanwhile, we are investigating new broadcast key distribution schemes
based on
Timed Efficient Stream Loss-tolerant Authentication
(TESLA) in order to improve the performance of packet
authentication in VANETs, and a suite of secure and anonymous
billing mechanism for the employment of Electronic Toll
Collection (ETC) systems. Currently, these research topics on
VANETs are actively undergoing and expected to create a number
of pioneering research results shortly.
(3)
Integration of Heterogeneous Wireless Networks and
Cognitive Radio
It has been envisioned that the
future wireless networks are composed of multiple wireless
communication technologies, where each mobile device could be
installed with multiple radio interfaces that can be
intelligently switched through user applications. Thus, I have
been addressing a significant amount of efforts on the study
of heterogeneous network integration. The undergoing research
topics in this area are around the scope of IEEE 802.21
standard on Media Independent Handover Functions (MIHF),
including the issues on network architecture design, handover
performance analysis, sleeping scheduling, and mobility
management.
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