A Simple and Practical Scheme Using Multiple Channels for Improving System Spectral Efficiency of Highly Dense Wireless LANs

Figure 6

An example scenario illustrating the cause of throughput unfairness between nodes. If nodes C and D transmit packets simultaneously, AP1 successfully decodes the packet from C while AP2 fails to decode the packet from D. Upon failure, D increases its contention window, lowering its share of channel bandwidth.