Universal Opportunistic Routing Scheme using Network Coding

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Presentation transcript:

Universal Opportunistic Routing Scheme using Network Coding Abdallah Khreishah, Issa Khalil, and Jie Wu

Enhancing the Performance of Wireless Networks Why to study the problem? Wireless multihop networks are becoming integral part of our lives. (Mesh networks, sensor networks, etc..) The unique features of these networks. Interference. Lossy behavior. Broadcast nature. Correlation among the links.

Opportunistic Routing

Opportunistic Routing

Opportunistic Routing

Global Scheduling

Global Scheduling

Network Coding

Network Coding

From Which & How many to How many.

How many packets should each node forward? Assuming independent links: [Chachulski et al., 2007]. Depends on many factors: The Loss rate of the links. The fraction of time a node is scheduled. The correlation among the links. [Srinivasan et al., 2010]

Correlation example

Cont.

Settings

Law of Diminishing Returns

Formulation

The Lagrange

The Lagrange

Distributed algorithm

Virtual Queues Updates

Practical problems If a node is scheduled to send packets, from which session it should send? When and how to assign credits to next-hop nodes?

Coded-feedback

Deciding the packet to send

Credit assignment

Convergence

Results

Simulation on Large Topologies

Conclusion A simple distributed algorithm that achieves the optimal unicast rate in wireless networks. It is a combination of: Opportunistic routing. Intrasession network coding. Convex optimization. Coded-feedback. Arbitrary delivery rates and correlations among the links.

Some Future Directions Studying Intersession Network Coding. Studying the Multicast case MobiHoc’12. Inter-batch coding. The relationship between interference and correlations among the links.

Thanks Questions?