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A Preferred Link Based Multicast Protocol for Wireless Mobile Ad hoc Networks

A Preferred Link Based Multicast Protocol for Wireless Mobile Ad hoc Networks. R. S. Sisodia, Karthigeyan. I, B. S. Manoj, and C. Siva Ram Murthy ICC 2003. Outline. Introduction Multicast Tree Preferred Link Based Algorithm Tree Maintenance Performance Conclusions. Introduction.

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A Preferred Link Based Multicast Protocol for Wireless Mobile Ad hoc Networks

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  1. A Preferred Link Based Multicast Protocol for Wireless Mobile Ad hoc Networks R. S. Sisodia, Karthigeyan. I, B. S. Manoj, and C. Siva Ram Murthy ICC 2003

  2. Outline • Introduction • Multicast Tree • Preferred Link Based Algorithm • Tree Maintenance • Performance • Conclusions

  3. Introduction • Existing multicast routing protocols can be broadly classified into two categories • Tree based protocols • Mesh based protocol • Mesh based protocols have high packet delivery ratio compared to tree based protocols • More control overhead • JoinQuerypackets

  4. Introduction (cont.) • This paper propose an efficient protocol • Preferred Link Based Multicast protocol (PLBM) • Uses a preferred link approach for forwarding JoinQuerypackets • Restricts the flooding of JQ packets • Preferred link based algorithm • Preferred nodes • Locally repairs broken links • The local two hop network topology

  5. Multicast Tree • Tree nodes • Multicast source • Connected member nodes • Forwarding nodes • Neighbors Neighbors Table (NNT) • Connect Table (CT)

  6. Multicast Tree (cont.)

  7. Preferred node E C Preferred Link Based Algorithm • The PLBA • Preferred links (nodes) • Utilizes the two hop topology information • NNT E C D B A

  8. Preferred Link Based Algorithm (cont.) • Condition 1 • The current forwarding node excludes all its neighbors that have already forwarded JQ D E B C JQ A

  9. Preferred Link Based Algorithm (cont.) • Condition 2 • The current forwarding node is prevented from forwarding JQ to those neighbors that are shared by the nodes D B C A

  10. Preferred Link Based Algorithm (cont.) • Condition 3 • Prevents broadcast to those nodes that are neighbors of nodes in the traversed path of JQ D D B C A

  11. Preferred Link Based Algorithm (cont.) • Example

  12. Preferred Link Based Algorithm (cont.) • Example

  13. Tree Maintenance PACKET_AWAIT_TIMER

  14. Performance • GloMoSim • Simulation Area 1000X1000 m • The simulation is run for 600 seconds • Transmission Rage 250m • Nodes 50 • PACKET_AWAIT_TIMER 1 sec

  15. Performance (cont.) Group size 20

  16. Performance (cont.) Mobility 9 m/s

  17. Conclusions • An efficient receiver-initiated tree based multicast protocol • Preferred link based approach • Dominating set

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