1. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer Science Sung Ho Park Message Ferrying: Proactive Routing in Highly-partitioned Wireless Ad Hoc Networks IEEE Workshop on Future Trends of Distributed Computing Systems 2003 Wenrui Zhao and Mostafa H. Ammar College of Computing, Georgia Institute of Technology 1

2. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer ScienceContents  Mobile Ad Hoc Networks (MANETs)  Sparse MANETs  New Approach for Sparse MANETs  Message Ferrying scheme  Message Ferry Routing Algorithm  Conclusion 2

3. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer Science Mobile Ad Hoc Networks (MANETs)  Without any existing infra structure or centralized administration  Rapidly deploying  Self configuring   Critical Applications  Battle fields  Disaster relief  Wide area sensing and surveillance 3

4. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer Science Sparse MANETs  Sparsely distributed  Network partitions can last for a significant period  Previous works  Focus on connected networks where an end-to-end path always exists between any two nodes 4 Radio transmission Range Mobile Ad Hoc Node

5. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer Science New Approach for Sparse MANETs  New approach to overcome network partitions  Use of a long range radio  lead excessive energy consumption  Epidemic routing  Potentially low data delivery rate and large delays  Message Ferrying (MF) scheme 5

6. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer Science Message Ferrying scheme 6

7. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer Science Message Ferry Routing Algorithm  NP-Hard (Non-deterministic Polynomial-time hard)  a 7

8. RTLAB Real-Time Systems Lab. Kyungpook National University School of Electrical Engineering and Computer ScienceConclusion  Present message ferrying scheme  Solve the data delivery problem in highly-partitioned wireless ad hoc networks  Present efficient algorithm to compute the message ferry route  Message ferrying scheme is more efficient in both data delivery(45%) and energy consumption(7.5 times) than Epidemic routing 8