Defining Cross-Layer Design

bottlelewdMobile - Wireless

Dec 12, 2013 (3 years and 8 months ago)

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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, low
-
bandwidth 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, energy
-
efficient MAC and routing, channel

aware data
compression, …


A fundament issue: Would the advantages of cross
-
layer 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.