As expected, there are 4 EUs seeking flows from more than one AP shown in the second subfigure.
If the best AP fails to satisfy that EU's QoS requirement, it continues seeking flows from its second best AP.
As cell phones ping and emails ding, moments of focused attention are few and far between so it is up to us to actively seek flow experiences.
As a result, the EU seeks flows from its second "best" AP2.
This situation is shown in the third figure where 5 EUs seek flows from more than one AP.
Then EUs will experience a higher price when asking for flows from AP l and may try to seek flows from other APs.
Roughly speaking, an EU always first tries to seek flows from the AP whose link to that EU is the best for the moment.
Although the power resource is still abundant, some EUs may need to seek flows from more than one AP since their corresponding "best" APs cannot transmit at a high power level which violates the interference constraint.
Now though MDs have a high interference tolerance level, some EUs may need to seek flows from more than one AP since their corresponding "best" APs may not have enough power resources to satisfy the QoS requirements.
Nevertheless, we can see only a few (0, 4, and 5 in the three subfigures, respectively) EUs out of total 30 EUs seek flows from more than one AP.
