Traffic Intensity Formula Quiz and Flashcards: Busy Hour Calculations

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Questions and Answers

What is the formula for calculating the call arrival rate?

A = λH (correct)

A = 2 / hour

A = 19.5 minutes/call

A = 0.325 hours/call

What happens when the offered traffic exceeds the maximum capacity of a trunked system?

The grade of service improves significantly

The channels are allocated randomly to users

The carried traffic becomes limited due to the limited capacity (correct)

The carried traffic increases exponentially

What type of trunked system does not have a setup time and provides immediate access to a channel if available?

Queuing system

Priority system

Blocking system

No queuing system (correct)

What is the unit of traffic intensity in Erlangs?

call-seconds per hour Signup and view all the answers

What is the average number of busy hour call attempts if the mean holding time is 100 seconds?

1.35 calls/second Signup and view all the answers

What is the formula for calculating the traffic intensity per channel in a C channel trunked system?

A_c = UA / C Signup and view all the answers

What is the primary responsibility of a wireless designer?

To estimate the maximum required capacity and allocate proper channels Signup and view all the answers

What is the unit of measurement for traffic intensity?

Erlangs or CCS Signup and view all the answers

What is the formula to calculate the total offered traffic intensity in a system?

A = UAU Signup and view all the answers

What is the relationship between the offered load and the carried load in a system?

Offered load is equal to the carried load plus the overflow Signup and view all the answers

In a wireless network, what is the average number of calls simultaneously in progress during a particular period of time?

Traffic intensity Signup and view all the answers

What is the purpose of allocating channels in a wireless network?

To meet the required Grade of Service Signup and view all the answers

What is the primary function of a trunk in mobile communication?

To provide access to multiple users simultaneously Signup and view all the answers

What happens to a user when all radio channels are in use?

The user is blocked or denied access to the system Signup and view all the answers

What is essential to design trunked radio systems that can handle a specific capacity at a specific grade of service?

Understanding queuing theory and trunking theory Signup and view all the answers

One Erlang represents the amount of traffic intensity carried by a channel that is:

Completely occupied Signup and view all the answers

What does the Grade of Service (GOS) measure?

The ability of a user to access a trunked system during the busiest hour Signup and view all the answers

Traffic intensity can be measured in:

Erlangs or Centum Call Seconds (CCS) Signup and view all the answers

Study Notes

Trunking and Grade of Service

A trunk is a communications line or link designed to carry multiple signals simultaneously to provide network access between two points.
The concept of trunking allows many users to share a relatively small number of channels in a cell by providing access to each user, on demand, from the available channels.
When all radio channels are already in use, the user is blocked, or denied access to the system.

Traffic Intensity and Call Holding Time

Traffic intensity is the average number of calls simultaneously in progress during a particular period of time.
It is measured either in units of Erlangs or CCS.
Each user generates a traffic intensity of 𝐴𝑈 Erlangs given by: 𝐴𝑈 = 𝜆𝐻, where H is the average duration of a call (Holding time), and λ is the average number of call requests per unit time.
For a system containing 𝑈 users and an unspecified number of channels, the total offered traffic intensity 𝐴 is given as: 𝐴 = 𝑈𝐴𝑈.

Erlangs and CCS

1 Erlang represents the amount of traffic intensity carried by a channel that is completely occupied (i.e. 1 call-hour per hour or 1 call-minute per minute).
1 Erlang equals 1 × 3600 call seconds (36 CCS).
CCS to Erlang conversion: 1 CCS = 1/36 Erlangs.

Blocking and Overflow

The probability that a call is blocked or the probability of a call experiencing a delay greater than a certain queuing time is known as the Grade of Service (GOS).
Overflow (O) = (Offered load) – (Carried load).

Trunked Systems

There are two types of trunked systems: 1) No Queuing, and 2) Queuing.
In a No Queuing system, there is no setup time, and the user is given immediate access to a channel if one is available. If no channels are available, the requesting user is blocked without access and is free to try again later.

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Description

This quiz covers the calculation of traffic intensity and busy hour call attempts in telecommunications. It involves solving problems using formulas and understanding the concepts of call arrival rate, average holding time, and traffic intensity. Test your knowledge of telecommunications fundamentals!

Telecommunications: Calculating Traffic Intensity and Busy Hour Call Attempts