In this work, we are interested in improving constructive wireless network 
coding schemes, such as cOPE, in the presence of high loss rates. We propose 
an approach, I2NC, that combines inter-session and intra-session network coding 
and has two advantages. 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 average 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 formulation of the 
problem. We propose two practical schemes, I^2NC-state and I^2NC-stateless, that 
mimic the structure of the NUM optimal solution and implement the properties 
mentioned above. We also address the interaction of our approach with the transport
layer. We demonstrate the benefits of our schemes compared to COPE, through 
simulation  in  GloMoSim.