Orange County NC Website
Browse       Search
Orange County Emergency Management, North Carolina <br />Final VIPER Anal sis Re ort Au ust 20, 2004 <br />There area (mite number of channels available in the <br />trunking pool. <br />Busy Hour occurs at the same time for all subscribers <br />C. Grade of Service (GOS) <br />GOS is a measure of the ability of a user to access a trunked system <br />without delay (i.e., without going into a queue) during the busiest <br />hour of radio operation. It is expressed as the probability of being <br />delayed (0% is good, 100% is very busy). <br />D. Delayed Call GOS <br />The probability that a delayed call is forced to wait more than the <br />maximum acceptable call delay (t seconds). <br />4.2.2 Traffic Loading Model <br />A trunked LMR system design goal is to deliver a specific call capacity at <br />a GOS conducive to clear, reliable communications. The busy hour is <br />based on user demand at the busiest operational hour during a week. <br />GOS is usually given as the likelihood that a call is blocked, or the <br />likelihood that a call is experiencing a delay greater than a certain queuing <br />time. <br />The traffic loading model that CTA has developed is based on a <br />transmission trunked LMR system that has a formal queue. If a radio <br />channel is not available immediately, the call request may be delayed until <br />a channel becomes available. <br />This type of radio system trunking is called "Blocked Calls Delayed <br />Trunking," and its measure of GOS is defined as "the probability that a <br />call is blocked after waiting a specific length of time in the queue." <br />.Section 4 -VIPER Coverage and Capacity <br />~~_~~~ Page 15 of 43 <br />.,. <br />