1. Multicast Routing in Mobile Ad Hoc Networks (MANETs)
Presented by
Mahmudul Islam

2. Acknowledgements Dr. Omar Ait-Hellal Dr. Ping-Tsai Chung
My Fellow-Classmates

3. What is a Mobile Ad Hoc Network (MANET)?
According to Internet Engineering Task Force (IETF), a MANET is an autonomous collection of mobile users that communicate over relatively lower-bandwidth wireless links.

4. Focus
Today, I will focus on one critical issue in MANETs, that is, “Multicast Routing”.

5. Design-Challenges of a MANET
The development of routing protocols with the key features:
Robustness
Simplicity
Energy conserving

6. Expected advantages from multicast routing
Providing efficient bandwidth
Reducing communication cost
Efficient delivery of data
Supporting dynamic topology

7. Technical constraints for multicast routing
Minimizing network load
Providing basic support for reliable transmission
Designing optimal routes
Providing robustness, efficiency, and adaptability

8. Classification
Globally, there are two main categories of multicast routing protocols:
Tree-based protocols, and
Mesh-based protocols

9. Examples of tree-based protocols
Multicast Ad hoc On-Demand Distance Vector (MAODV) routing protocol
Associativity-based Multicast (ABAM) routing protocol

10. Multicast Ad hoc On-Demand Distance Vector (MAODV)
Extends AODV to offer multicast capabilities
Builds shared multicast trees on-demand to connect group members
Capable of unicast, broadcast, and multicast

11. Associativity-based Multicast (ABAM)
Constructed in an attempt to reduce communication overhead and end-to-end delay

12. An example of mesh-based protocols
On-Demand Multicast Routing Protocol (ODMRP)

13. How ODMRP works?
ODMRP is based on a mesh structure for connecting multicast members using the concept of forwarding group nodes.
When a data packet reaches a multicast receiver, the receiver creates a Join-Table and broadcasts it to the neighbors.

14. How ODMRP works? (cont.)
Each group member propagates the Join-Table until it reaches the multicast source via the shortest path.
This process constructs and updates the routes from the source to the receiver, creating a mesh of nodes.

15. A quick comparison ODMRP MAODV ABAM Multicast delivery Mesh Tree
Routing approach
On-demand
Control overhead
Periodic flood
Tree construction

16. Summary
Distribution of handout