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Local Number Portability Traffic Analysis Calculations


Consumers can keep their telephone number and have any provider that will serve them. ... used to derive location information based on your telephone number. ... – PowerPoint PPT presentation

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Title: Local Number Portability Traffic Analysis Calculations

Local Number PortabilityTraffic Analysis
  • ENGR 475 Telecommunications
  • October 19, 2006
  • Harding University
  • Jonathan White

Outline - LNP
  • Definition of Local Number Portability
  • Required by Law
  • New components in the network
  • Why have LNP
  • Wireless and LNP
  • 911 and LNP

Outline Traffic Analysis
  • What Traffic Engineering is used for
  • Busy Hour traffic
  • A.K. Erlangs Distributions
  • Examples of board

Local Number Portability
  • LNP
  • Mandated by the Telecommunications Act of 1996.
  • Telcos had until 2002 to completely comply.
  • What it is
  • Consumers can keep their telephone number and
    have any provider that will serve them.
  • Consumers can also keep their telephone number
    when they move to a new location.

Benefits of LNP
  • More competition drives lower prices and better
  • Telecommunications biggest enemies
  • Churn
  • Fraud
  • Most people want to keep their telephone numbers.
  • Why would this be true?
  • The LNP act gives these people the ability to
    have competition for their dollars.

Wireless LNP
  • Because of LNP, you can get a local telephone
    number any where in the US, no matter where you
  • For example, I bought my phone in Bentonville,
    Arkansas, but I was able to get a local Searcy
  • However, having wireless LNP makes billing even
    more complex.

Additional Network Objects
  • On the SS7 network, a new database is required to
    support LNP so that the call is routed across the
    correct network.
  • Providers can actually pay to have access to
    updated LNP databases.
  • GTE and Cincinnati Bell Information Services
  • This adds cost and delay to the system.
  • This database is called the local service
    management system.
  • Local SMS.

911 and LNP
  • The 911 system used to derive location
    information based on your telephone number.
  • No longer directly possible.
  • Your location information is now passed to 911
    through database access.
  • This makes the 911 system less reliable.

911 and Wireless
  • Cell phone towers are no equipped with GPS units
    so that they can calculate where your call came
  • If 3 or more towers are within your signal range,
    they can triangulate your exact location.
  • But again, LNP means 1 more database dip.
  • Also, the databases must be maintained.

Who Pays
  • We ultimately pay for local number portability.
  • Is it worth it?

Traffic Analysis
  • Method for determining the cost effectiveness of
    various sizes and configurations of networks.
  • Helps us to decide how many telephone trunks we
    should use to service organizations.
  • Formulas were used now, computer modeling is
    almost exclusively used.

Uses of Traffic Engineering
  • Utilizing the correct number of links at the best
    price point.
  • Cost versus effectiveness
  • What do you engineer to?
  • The busiest hour?
  • The average amount of traffic?
  • The minimum required that will still retain
  • How are our road systems engineered?

Agner Krarup Erlang
  • Danish mathematician and engineer.
  • 1878 1929
  • Worked for the telephone company in Copenhagen
    from 1908 to 1929.
  • Applied math to calculating how many circuits and
    telephone operators were needed.
  • His formulas were incredibly good for the time
    period, and they were used until very recently.

Grade of Service
  • GOS How many callers will be refused service.
  • This could be a busy tone or a redirection to
    voice mail.
  • Telephone companies have designed their networks
    so that the probability that a circuit will be
    blocked must be between 1 and 5 percent.
  • To get a lower blocking percentage than 1 percent
    gets exponentially more difficult.

Traffic Analysis
  • Erlangs ideas are used extensively in
  • Data networks
  • Voice networks
  • Busy hour traffic on interstates
  • Banking/Supermarket queuing theory.
  • General max/min optimization problems

Traffic Analysis
  • The rest is on the board
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