Modeling such situation using classical preemption or non-preemption priority service disciplines may result in a severe degradation of the QoS for a particular class.
A feasible schedule for such a project is completely characterized by the starting times (mathrm{ST}_j) (or, due to non-preemption, alternatively by the finishing times (mathrm{FT}_j,=,ST_j,+,d_j)) of all activities j, so that all precedence constraints are respected and that the project is feasible with respect to the capacities of the resources required to perform these activities.
The main reason is that Class II has a longer delay tolerance than Class I, and therefore has a higher probability to arrange longer sleep periods, which additionally indicates that sufficient rates of the non-preemption schemes decrease as the number of rtPS MS increases.
For the exceptional non-preemptive and preemption in case of failure service disciplines, introduced in this paper and presented in Section 4.2 and 4.4 respectively, we only analyze the case of exponential operating periods due to the analytical complexity of those schemes without the assumption of memoryless operating periods.
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However, the packet delivery delay increases of PNP-MAC due to preemption of the non-emergency data from allocated slots on the arrival of the emergency data.
During preemption of the non-emergency data from slots, the life-critical data based BMSs face a higher delay because of contention of other BMSs and in this way the delay increases as the traffic load exceeds.
The limitation of this scheme is the preemption of the non-critical data from DTS slots on the arrival of critical data which is the drawback of this scheme in terms of the preempted nodes drop data.
Nonetheless, it has been widely acknowledged that Lewis's theory has problems with other types of preemption, and with probability-raising non-causes (see Section 2.10 above).
The four service disciplines are denoted in the figures as 'Non' (non-preemptive), 'ENo' (exceptional non-preemptive), 'Pr' (preemptive) and 'FP' (preemption in case of failure).
On the other hand, for static scenarios the preemption in case of failure service discipline performance gets closer to the non-preemptive discipline due to the lack of opportunities for HP packets to preempt LP packet service.
