The experimental long spacings for the series of PMMA/PS films studied show a good correlation with the nominal periodicity values of the stacks.
This result indicates that streams with longer periodicity values suffer less impact when compared with streams with shorter periodicity values, where deadline misses are caused essentially by message losses.
Also, the periodicity values of message streams play an important role in the RT communication performance, regardless of messages size.
Also, message streams with longer periodicity values tend to present less deadline misses, regardless of their size, since they contend for the medium access less frequently.
On the other hand, message streams with shorter periodicity values tend to present higher number of deadline misses since there are more messages being transmitted in a shorter time interval, which are therefore more prone to losses.
Thus, the IEEE 802.11s standard with the mandatory EDCA scheme may only reliably support RT traffic with shorter periodicity values when the network utilization is below 20% and the interference traffic occurs at lower priority classes.
Based on the above equations, for U = 10%, the client requests are sent with a periodicity of 125 ms, for U=30% with 42 ms and for U=50% with 25 ms. These periodicity values are used as the mean value for the Poisson process that defines the client request interval.
Considering message streams 1 and 4, which are the streams with shorter periodicity values (Table 4), they clearly exceed a DMT value of 15% (target defined in Section 4) when the network utilization is greater than approximately 12% and 21%, respectively, even for the case when the maximum priority traffic separation is imposed.
By periodicity, the value of G on (mathcal {D}_{10}) and (mathcal{D}_{01}) completely determines the value of G on the whole set (mathcal{D}).
