To make the wireless network coding scheme fit for large data transmission well
the processing of dividing data into blocks is added into the scheme.After the analyzing the transmission model of the blocks
it is found that channel utilization and the size of the block is closely related.In order to transmit the data with an appropriate block size to get higher channel utilization
a block size selection approach is given to maximize the channel utilization.The approach is simple and feasible
and by the simulations
after using this approach
the channel utilization will be very close to its upper limit.