**4.2 Simulation results**

Silulations were carried out to evaluate the performance of user based admission control algorithm. Simulation Parameters are given in Table-12.


Table 12. Simulation parameters.

Simulations were carried out to find the acceptance ratio for the connection requests for priority users and non-priority users. Acceptance ratio is defined as the ratio between the number of connections accepted to the total number of connections requested. Fig. 17 shows the simulation results for acceptance ratio when the network contains only RTPS connections.

for each service class (i.e UGS, RTPS, eRTPS, nRTPS and BE)

if BS can support QoS needs of connection request

 for each connection request in *priority queue* of service class if BS can support QoS needs of connection request

for each connection request in *non-priority queue* of service class

So, first, connections of priority UGS shall be accepted, followed by Non priority UGS. Priority RTPS and Non Priority RTPS follow next. Once RTPS connections are taken care, priority and Non priority eRTPS connection as admitted in that order. Subsequently priority and Non priority nRTPS connections are admitted. And finally priority and non priority BE

Silulations were carried out to evaluate the performance of user based admission control

Simulations were carried out to find the acceptance ratio for the connection requests for priority users and non-priority users. Acceptance ratio is defined as the ratio between the number of connections accepted to the total number of connections requested. Fig. 17 shows the simulation results for acceptance ratio when the network contains only RTPS connections.

**Parameter Value** 

Fig. 16. User Based Admission control.

AdmissionControlAtBS( )

if bandwidth available

if bandwidth available

Admit Connection.

Admit Connection.

Begin

End

algorithm. Simulation Parameters are given in Table-12.

Uplink Capacity 16 Mbps

Lifetime of Connections 2 - 6 seconds Data rate of UGS connections 256 kbps Data rate of RTPS connections 256 kbps Data rate of eRTPS connections 256 kbps Data rate of nRTPS connections 256 kbps Data rate of BE connections 256 kbps Simulation Lifetime 200 seconds

Arrival of Connection Requests Poisson arrival pattern

connections are admitted.

**4.2 Simulation results** 

Table 12. Simulation parameters.

Fig. 17. Connection acceptance ratio for RTPS connections.

From Fig. 17 we can see that till the connection arrival rate is 10 connections/sec, there is enough capacity to accept both priority and non-priority connections. But beyond that the network cannot support the connection. So it starts to reject the connection. Since connection requests from priority users are processed first, the acceptance ratio for priority users would be higher compared to non-priority users.

Fig. 18 shows the simulation results for RTPS connections for different uplink capacities.

Fig. 18. Connection acceptance ratio for RTPS connection at different uplink capacities.

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.

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 broadband experience for this section of users.
