Define Cross-Layer Design for Wireless Networking
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Transcript Define Cross-Layer Design for Wireless Networking
Defining Cross-Layer Design
for
Wireless Networking
ICC 2003 Panel Discussion
Organizer: Junshan Zhang
Arizona State University
Challenges and Opportunities
A central problem: How to efficiently transmit
heterogeneous traffic over wireless links?
Physical-layer limits of wireless channel:
o time-varying fading, multipath, …
o co-channel interference, hostile jamming, …
o mobility, dynamic network topology, …
Wireless networking:
o Applications: wireless Internet access, (tactical) ad hoc
networks, sensor networks
o Diverse requirements: high-bandwidth video and data, lowbandwidth voice and data
o Goal: reliable communication-on-the-move in highly dynamic
environments, QoS provisioning
Why and How to do Cross-Layer
Design
Why:
o There exists direct coupling between physical
layer and upper protocol layers
o Is cross-layer design the only approach to meeting
the fast-growing demands?
How: Adaptive protocol design
o Which layers should respond to channel variations?
o What layers should be jointly optimized/designed?
o Complexity and scalability: cross-layer versus
layered module –- conflicting paradigms ?
Wireless Network Architecture
Do we need unified or different
methodologies for different networks?
o Ad hoc networks
o Wireless LAN
o Cellular networks
o New drivers: (dense) sensor networks?
Existing paradigms: opportunistic scheduling, energyefficient MAC and routing, channel –aware data
compression, …
A fundament issue: Would the advantages of crosslayer design lead to new network architecture?
Academic Research on
Cross-Layer Design
Is cross-layer design short-term or
long-term?
Research focus: theory, algorithm
and/or simulation?
Funding sources: government?
industry?
What advice would you give to new
graduate students looking for thesis
topics?
Our Panelists
Prof. Anthony Ephremides, U. Maryland
Prof. Lang Tong, Cornell U.
Prof. Andrea Goldsmith, Stanford U.
Prof. P.R. Kumar, UIUC
Moderator: Junshan Zhang, Arizona State U.
Panel Format
Panelist presentations (12-15 min each)
Panelist observations/questions
Open discussion with the audience
Enjoy the panel discussion!
Appended Remarks (from
Moderator)
Misconceptions:
o Cross-layer design means to get rid of
protocol layers.
o Cross-layer design requires to integrate all
protocol layers.
Key to cross-layer design: A holistic
view of wireless networking.