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IEEE 2010 - - Toward Practical Opportunistic Routing with Intra-session Network Coding for Mesh Networks

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IEEE 2010 - - Toward Practical Opportunistic Routing with Intra-session Network Coding for Mesh Networks Powered By Docstoc
					NCCT                                     IEEE PROJECTS 2010-11
Promise for the Best Projects               JAVA & .NET

NETWORKING, IEEE/ACM TRANSACTIONS ON
ISSUE DATE: APRIL 2010

  TOWARD PRACTICAL OPPORTUNISTIC ROUTING WITH INTRA-
     SESSION NETWORK CODING FOR MESH NETWORKS

ABSTRACT
We consider opportunistic routing in wireless mesh networks. We exploit
the inherent diversity of the broadcast nature of wireless by making use
of multipath routing.
We present a novel optimization framework for opportunistic routing
based on network utility maximization (NUM) that enables us to derive
optimal flow control, routing, scheduling, and rate adaptation schemes,
where we use network coding to ease the routing problem.
All previous work on NUM assumed unicast transmissions; however, the
wireless medium is by its nature broadcast and a transmission will be
received by multiple nodes. The structure of our design is fundamentally
different; this is due to the fact that our link rate constraints are defined
per broadcast region instead of links in isolation.
We prove optimality and derive a primal-dual algorithm that lays the
basis for a practical protocol. Optimal MAC scheduling is difficult to
implement, and we use 802.11-like random scheduling rather than
optimal in our comparisons. Under random scheduling, our protocol
becomes fully decentralized (we assume ideal signaling).
The use of network coding introduces additional constraints on
scheduling, and we propose a novel scheme to avoid starvation. We
simulate realistic topologies and show that we can achieve 20%-200%
throughput improvement compared to single path routing, and several
times compared to a recent related opportunistic protocol (MORE).




      NCCT, 28235816, 93801 02891, 98411 93224
  www.ncct.in, www.ieeeprojects.net, ncctchennai@gmail.com

				
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