Lesson 4:

Limited-availability group

Figure 11: Limited-availability group

A limited-availability group is a group divided into some identical subgroups. Let us consider a limited-availability group which is featured in the following structural parameters (see Figure 11):

  • k – number of subgroups in a group,
  • f – capacity of a subgroup (the number of channels in the subgroup),
  • V – total capacity of the group ( V = k . f ).

The system services a call — only when this call can be entirely carried by the resources of an arbitrary single subgroup.

The states probabilities in the limited-availability group are approximated by the generalised Kaufman-Roberts recursion (10), where the conditional probabilities of passing
si(n) are calculated by the combinatorial method presented in the next part of this Lesson.