Title :
I2NC: Intra- and inter-session network coding for unicast flows in wireless networks
Author :
Seferoglu, Hulya ; Markopoulou, Athina ; Ramakrishnan, K.K.
Author_Institution :
Dept. of EECS, Univ. of California, Irvine, CA, USA
Abstract :
In this work, we are interested in improving the performance of constructive network coding schemes in lossy wireless environments. We propose I2NC - an approach that combines inter-session and intra-session network coding and has two strengths. First, the error-correcting capabilities of intra-session network coding make our scheme resilient to loss. Second, redundancy allows intermediate nodes to operate without knowledge of the decoding buffers of their neighbors. Based only on the knowledge of the loss rates on the direct and overhearing links, intermediate nodes can make decisions for both intra-session (i.e., how much redundancy to add in each flow) and inter-session (i.e., what percentage of flows to code together) coding. Our approach is grounded on a network utility maximization (NUM) formulation of the problem. We propose two practical schemes, I2NC-state and I2NC-stateless, which mimic the structure of the NUM optimal solution. We also address the interaction of our approach with the transport layer. We demonstrate the benefits of our schemes through simulation in GloMoSim.
Keywords :
error correction codes; network coding; wireless mesh networks; inter-session coding; intra-session coding; lossy wireless environments; network coding; network utility maximization; unicast flows; wireless networks; Encoding; Network coding; Propagation losses; Redundancy; Throughput; Unicast; Wireless communication; Network coding; cross-layer optimization; error correction; wireless networks;
Conference_Titel :
INFOCOM, 2011 Proceedings IEEE
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-9919-9
DOI :
10.1109/INFCOM.2011.5934877