7Finite Multirate Retry Threshold Loss Models
We consider multirate loss models of quasi‐random arriving calls with elastic bandwidth requirements and fixed bandwidth allocation during service. Calls may retry several times upon arrival (requiring less bandwidth each time) in order to be accepted for service. Alternatively, new calls may request less bandwidth according to the occupied link bandwidth indicated by threshold(s).
7.1 The Finite Single‐Retry Model
7.1.1 The Service System
In the finite single‐retry model (f‐SRM), a single link of capacity 
b.u. accommodates calls of 
service‐classes under the CS policy. Calls of service class 
come from a finite source population 
. The mean arrival rate of service‐class 
idle sources is given by 
, where 
is the number of in‐service calls ...
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