WHYNET: Progress and Plans

1
WHYNET Progress and Plans

• Prasant Mohapatra
• Department of Computer Science
• University of California, Davis

2
QoS in Multihop Networks

• Network layer QoS support
• MAC layer QoS support
• Testbed progress

3
Network Layer QoS Support

• Developed a framework, called PANDA, that
  integrates QoS requirements during the path
  discovery process
• Based on various QoS and security attributes
  PANDA helps in the discovery of QoS-satisfying
  paths by selecting the best next-hop node.
• The best next-hop node is selected locally
  without any additional communication overheads.
• Evaluation using NS-2 shows
• Improved path performance in terms of end-to-end
  delay and delivery ratio
• More than 50 energy savings
• Increases network lifetime
• Very low overheads

4
MAC Layer QoS Support

• Using per-hop service differentiation to achieve
  the end-to-end requirements
• The QoS specification is translated to per-hop
  requirements
• At every hop, based on the per-hop requirements,
  the packets are prioritized into the queues
  (similar to IEEE 802.11e implementation)
• We have developed a framework that facilitates
• Load-aware routing and path discovery
• Admission control by probing the resource
  availability in the routes
• Dynamic per-hop priority based channel access

5
Testbed Progress

• We have built an ad hoc network with 12 nodes
• Tested for a maximum of 6-hop communications
• Currently developing tools for logging and
  measuring various performance and other metrics.
  These tools, when ready, will be made available
  to other researchers.
• Plans are underway to increase the size and
  incorporate QoS support in the testbed

6
Related Efforts

• Other efforts that are being leveraged from the
  NRT support
• Multicasting in mobile ad hoc networks (Infocom
  2004)
• Target tracking sensor networks (Mobicom 2004)

7
Publications

• J. Li and P. Mohapatra, "PANDA A QoS
  Provisioning Framework for Mobile Ad Hoc
  Networks," Submitted to WINET. A preliminary
  version appeared in the IEEEWireless Symposium,
  Globecom 2003.
• C. Gui and P. Mohapatra, "Scalable Multicasting
  in Mobile Ad Hoc Networks,"IEEE Infocom, 2004.
• C. Gui and P. Mohapatra, "Power Conservation and
  Quality of Surveillance in Target Tracking Sensor
  Networks," ACM Mobicom, 2004.