In general, there will be lots of sub-flows from the source node to the destination node, as shown in Fig. 5. Firstly the congestion factor of each sub-flow is obtained from contention matrix, then the congestion factors of all sub-flows are used to redistribute the flow traffic. For example, the total resistance except R1, the contention factor on the sub-path f1,1 should be firstly calculated. In other words, the remaining paths can be regarded as the equivalent parallel resistance R1∗: