Problem definition

As discussed the main aim of this project is to evaluate the quality of service requirements for the voice applications across the wireless LAN networks and in this context OPNET modeler is used as the simulation tool and the simulation has three scenarios.

A simple low quality speech is used for the first scenario and IP telephony application is used for the second scenario, where the GSM quality speech is used for the third scenario. Application and profile definitions are also done where each scenario is created at the application level configurations and these profiles are set for the 20 mobile nodes and the wireless LAN server used across the WLNA based MANET. Voice level and wireless LAN level metrics are used for the performance evaluation for three scenarios created and the simulation is run for 5 minutes to evaluate the results.

All the three scenarios created are compared at the performance level metrics and the corresponding quality of service requirements is analyzed to understand the best voice source in terms of quality of service. The actual aims and objective used for this research are as given below.

Importance of Voice in upcoming Networks:

The prediction of congregated networks for coming generations is possible now because of the wide range of growth in the access of broadband and that which leads for the development of ATM and IP infrastructures, and these upcoming networks are those where the data, video and voice services are offered across the infrastructure of a single network.

This leads to the establishment of two key drivers and these two drivers must be considered significantly for providing the end-to-end voice services for the voice solutions of next generation networks. The clear explanation of the two drivers is given below.

  • Triple play networks: The service providers who has newly entered into market also trying to offer a voice service that is “PSTN replacement voice service” and this is done for offering an exciting package by adding better television services and fast video and internet facilities. In order to offer this package of services the service providers or operators partially focuses on the requirement of voice support for them but the truth is that the expenses are reduced by these voice services and the best returns and margins on investments are provided by these voice services and is significant for the operators.
  • PSTN Evolution: The traditional service providers of the network are trying to divert their relic platforms of PSTN against the networks that are new. This diversion is focused by the investment saving which is provided by the data networks and voice networks which are integrated, the new services offered can gain better profit in addition and the support of networks is towards, and thus switches the coming desuetude of the narrow bands that are installed.

                     The networks of the coming generation must have the capacity of encouraging the services that are almost similar to the PSTN that is exist presently especially in terms of the reliability and availability and this is done for effectively encouraging the needs of various kinds of voice arrangements.

In addition to this, the capacity of upholding the voice services even in the situations like over load and in this type of approach that there will be a great decrease in the voice calls in count, the reliability of the up-hold voice calls is also sustained in the situations that are severely extreme.