1. Communication in heterogeneous ad hoc grid Shan Natarajan

2. Ad Hoc Networking The art of networking without a network  No fixed infrastructure  Hosts act as routers  Multihop communication

3. Characteristics Dynamic topology Bandwidth constrained Energy constrained Less secure

4. Heterogeneous Ad Hoc Network Different types of entities  Primitive devices with low resources  Sophisticated devices with high resources  Asymmetric Links  Can hear another node but cannot send messages to that node

5. Motivation Network centric computing is about computational grids Ad hoc grid is a particular scenario Typical application areas Military Relief operation in disaster areas Archaeological surveys

6. IETF MANET Work Group Goals Long term goals Research in routing protocols Proactive protocols Reactive protocols

7. Specific Objectives Sparsely populated heterogeneous ad hoc network Define a precise model of the system Asymmetric links Existing protocols New protocol ?

8. Literature A review of current routing protocols for ad hoc mobile wireless networks E.M Royer, C-K Toh Location aided routing in mobile ad hoc networks Y.B Ko, N.H.Vaidya GAHA and GAPA: Approaches for link asymmetry in mobile ad hoc networks D. Kim. H. Jeong C-K Toh