Podcast
Questions and Answers
What is the formula for calculating the call arrival rate?
What is the formula for calculating the call arrival rate?
What happens when the offered traffic exceeds the maximum capacity of a trunked system?
What happens when the offered traffic exceeds the maximum capacity of a trunked system?
What type of trunked system does not have a setup time and provides immediate access to a channel if available?
What type of trunked system does not have a setup time and provides immediate access to a channel if available?
What is the unit of traffic intensity in Erlangs?
What is the unit of traffic intensity in Erlangs?
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What is the average number of busy hour call attempts if the mean holding time is 100 seconds?
What is the average number of busy hour call attempts if the mean holding time is 100 seconds?
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What is the formula for calculating the traffic intensity per channel in a C channel trunked system?
What is the formula for calculating the traffic intensity per channel in a C channel trunked system?
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What is the primary responsibility of a wireless designer?
What is the primary responsibility of a wireless designer?
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What is the unit of measurement for traffic intensity?
What is the unit of measurement for traffic intensity?
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What is the formula to calculate the total offered traffic intensity in a system?
What is the formula to calculate the total offered traffic intensity in a system?
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What is the relationship between the offered load and the carried load in a system?
What is the relationship between the offered load and the carried load in a system?
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In a wireless network, what is the average number of calls simultaneously in progress during a particular period of time?
In a wireless network, what is the average number of calls simultaneously in progress during a particular period of time?
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What is the purpose of allocating channels in a wireless network?
What is the purpose of allocating channels in a wireless network?
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What is the primary function of a trunk in mobile communication?
What is the primary function of a trunk in mobile communication?
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What happens to a user when all radio channels are in use?
What happens to a user when all radio channels are in use?
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What is essential to design trunked radio systems that can handle a specific capacity at a specific grade of service?
What is essential to design trunked radio systems that can handle a specific capacity at a specific grade of service?
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One Erlang represents the amount of traffic intensity carried by a channel that is:
One Erlang represents the amount of traffic intensity carried by a channel that is:
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What does the Grade of Service (GOS) measure?
What does the Grade of Service (GOS) measure?
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Traffic intensity can be measured in:
Traffic intensity can be measured in:
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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!
