INSIGNIA TALK

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INSIGNIA Providing QoS in Mobile Ad Hoc
Networks INSIGNIA Project Team COMET
Group Columbia University
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Mobile Ad Hoc Networks (MANET)
Autonomous Distributed Systems All mobile nodes,
all wireless connections ubiquitous
mobility wireless characteristics
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• Mobile Ad Hoc Networks (contd)
• ubiquitous mobility - topology changes -
  frequent rerouting
• expect packet loss over multi-hop wireless
  links
• MANET Working Group (IETF)
• mainly on routing DSR, AODV, TORA, etc.
• traditionally best effort service ...
• now some begins to talk about QoS issues
• as traffic load or mobility increases, the
  service quality degrades
• substantially

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• However,
• We want to provide something better than best
  effort service for some flows,
• e.g., video, voice.
• Hard QoS guarantee not possible in MANET
• - Adaptive QoS
• Resource maintenance and management in MANET
• - guarantee timely removal of reservations on the
  old route
• Explicit out-of-band signaling is not responsive
  enough and often fails to
• reach the target mobile nodes.

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• Therefore,
• to be responsive
• In-Band Signaling
• - only requires the first packet on new path to
  initiate the restoration
• for management of resources and maintenance of
  reservations
• Mobile Soft-State
• - outstanding reservations and states
  automatically time out
• Goal of INSIGNIA
• Provide adaptive QoS for all types of traffic in
  mobile ad hoc networks

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Reservation Set-up
M2
MS
MD
M1
M3
M4
QOS report MAX reservation established
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Re-routing / Restoration
M2
M2
MS
MD
M1
M3
Rerouting
Rerouting
M4
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Re-routing / Degradation
MS
MD
M1
Rerouting
Rerouting
Rerouting
Rerouting
M4
bottleneck node
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Adaptation Scale Down
Scale down to MIN service
MS
MD
M1
M5
bottleneck node
M4
QOS report Scale Down
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Adaptation Scale Up
MAX service re-initiated
MS
MD
M1
M5
bottleneck node
bottleneck node
M4
QOS report Scale Up
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In Summary INSIGNIA

• performs fast resource reservation, responsive
  restorations
• and timely adaptations
• QoS reports function as notification of flow set
  up completion, report for on-going service
  quality and also used for adaptation process.
• In band nature allows INSIGNIA to be responsive
  enough to deal with the frequent rerouting.
• Mobile soft state approach guarantees the
  release of outstanding reservations as well as
  avoiding false restorations and resource lockups

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Sample Results
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Sample Results (contd)
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References Publications
IETF MANET WG INSIGNIA Project
URL http//www.comet.columbia.edu/insignia Publi
cations are also found at, http//www.comet.columb
ia.edu/insignia