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Theoretical results on blocking probability of new and handover calls from WiMAX subscribers, as well as new connections from LR-WPAN Senspots in a cell of WiMAX have been investigated in terms of call/connection rates and number of allocated channels.
(2) Call level: in call level, users expect that both blocking probability of new calls and dropping probability of handoff calls should be at minimum value.
The blocking probability of new calls is given by B_{n} = sumlimits_{i = s + 1}^{c + r + N} {P_{i} } (5).
Recall that this Erlang capacity corresponds to the maximum offered traffic load of secondary users where the QoS requirements are guaranteed in terms of blocking probability of new voice and data calls and forced termination probability of secondary voice calls.
The test results reveal that the FCAC scheme significantly reduces the dropping probability of handoff calls at the cost of increasing the blocking probability of new calls to an acceptable level.
This positive behavior of strategy E4 is achieved by the use of channel reservation and by precluding the use of a buffer for new data calls (that is, strategy E4 interchange capacity by blocking probability of new data calls).
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Pb1 and Pb2 are the blocking probabilities of new connection requests of types 1 and 2 services, respectively.
The blocking probabilities of new connection requests and the dropping probabilities of handover connection requests of type 2 services are the highest because the connections require five times the amount of BBUs as type 1 services.
Figure 2 shows the blocking probabilities of new connection requests to the two services and the dropping probabilities of handover connection requests for types 1, 2, and 2* services in cell 1 versus the adaptive coding threshold.
Next, the blocking probabilities of new connection requests and the dropping probabilities of handover connection requests for the two services are increased because the occupancy of cell 1 is increased, as shown in Figure 5. Figure 6 shows the effect of the CMR on the adaptive coding probability.
At this point, the average PSNR is 28 dB. Figure 5 shows the blocking probabilities of new connection requests for types 1 and 2 services, and the dropping probabilities of handover connection requests for all services in cell 1 when the "call to mobility ratio" (CMR) of types 1 and 2 services is increased.
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