Call Traffic Engineering for btech 3rd year students.pptx

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1. Telecom Traffic Engineering Prepared by Dr U D Dalal Professor, DoECE , SVNIT, Surat

2. Objectives of Traffic Engineering Given expected traffic ( growth assumptions/predictions) Provision resources (trunks/channels, switches) To minimize cost of services subject to minimum acceptable quality of service requirements. How to measure the traffic, Erlang B and Erlang C formula Grade of Service measurement (GOS) Available tools Mathematical tools Equations and formulas / Statistical tools Simulation tools OPNET, OMNET etc.

3. It is a problem of Statistical Analysis ---Why? We cannot exactly predict what users do, When they call We can statistically tell what users may do, based on the traffic pattern Looking at the traffic pattern we can see number of callers arrived in one hour 20/hr or so Average length of calls 3 min/call Statistics on voice and data communications are very different Data tends to be bursty , Voice is continuous with known average length On a switch On a call center

4. Call Blocking and GOS Calls arrive randomly, in such situations We need to study the call handling capability of the switch We need to ensure avoiding blocked calls We need to figure out statistically what the probability of blocking is for a particular grade of service

5. The Erlang -Definition The Erlang (symbol E) is a dimensionless unit of traffic intensity measurement that is used in telephony as a measure of offered load or carried load on service-providing elements such as telephone/mobile circuits or telephone/mobile switching equipment. Erlang B and Erlang C formula based on two types of calls

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