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Wireless Communications Principles and Practice, Second Edition by Theodore S. Rappaport

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Appendix A. Trunking Theory

Two major classes of trunked radio systems are the Lost Call Cleared (LCC) systems and Lost Call Delayed (LCD) systems [Sta90].

In Lost Call Cleared systems, queueing is not provided for call requests. When a user requests service, there is minimal call set-up time and the user is given immediate access to a channel if one is available. If all channels are already in use and no new channels are available, the call is blocked without access to the system. The user does not receive service, but is free to try the call again later. Calls are assumed to arrive with a Poisson distribution, and it is further assumed that there are a nearly infinite number of users. The Erlang B formula describes the grade of service (GOS) ...

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