**6. References**

Chandra S. & Sahoo A. (2007), An efficient call admission control for IEEE802.16 networks, *in Proceedings of the 15th IEEE Workshop on Local and Metropolitan Area Networks*, pp. 188–193, ISBN 1-4244-1100-9, Princeton, NJ, USA, June 2007

Simulations were also carried out to check the performance of user based admission control algorithm when BS receives connection requests for all the types of service classes i.e UGS, RTPS, nRTPS, eRTPS and BE. Fig 19. illustrates the simulation results for this scenario.

> priority UGS Non priority UGS priority RTPS Non priority RTPS priority eRTPS Non priority eRTPS priority nRTPS Non priority nRTPS

priority BE Non priority BE

0 10 20 30 40 **Connection Arrival Rate (Conn/Sec)**

broadband experience for this section of users.

users can be up-graded/down-graded dynamically.

**4.3 Drawback of user admission control** 

privilege of being a priority user.

**5. Conclusion** 

**6. References** 

Fig. 19. Connection acceptance ratio for connections from different service classes.

From the simulation results it is clear that implementing user based admission control improves the connection acceptance ratio for priority users, there by improving the

If, at any point in time, the network receives many connection requests from priority users then there is a chance that the non-priority users might see higher rejections of their connections. This can be tackled at the operator level. Based on the capacity of the network, a network service provider can limit the number of priority users that he can support. So when signing a new user, the operator can decide whether he wishes to provide the user the

In this chapter a comprehensive user based framework is proposed across various modules in WiMAX. Though operator can provide graded services by having different data rates at different price points, it does not give the flexibility that user based framework provides. Using the user based framework, graded services can be managed at the MAC layer and

Chandra S. & Sahoo A. (2007), An efficient call admission control for IEEE802.16 networks,

188–193, ISBN 1-4244-1100-9, Princeton, NJ, USA, June 2007

*in Proceedings of the 15th IEEE Workshop on Local and Metropolitan Area Networks*, pp.

0

0.2

0.4

0.6

**Connection Acceptance Ratio**

0.8

1

1.2

