A Dynamic Pre-Emptive Call Admission Control Scheme for Emergency Communications in LTE-Based Public Safety Networks
DOI:
https://doi.org/10.63746/njtd.v22i4.3041Keywords:
Call Admission Control, LTE, Public Safety Network, Resource utilization, ThroughputAbstract
Historically, wireless networks have experienced difficulties caused by network congestion because of inadequate resources. The network providers and subscribers are affected by congestion through degraded Quality of Service (QoS). Network congestion becomes even more worrisome for emergency calls especially during emergencies. To manage this challenge, a preemptive call admission control (Pre-CAC) scheme that prioritizes public safety calls amidst emergency conditions, is proposed. This technique focuses on minimizing the inconveniences faced by Emergency First Responders (EFR) and the general public by prioritizing public safety calls above commercial calls during emergencies. The Pre-CAC scheme explores probability methods to vary certain network conditions in-line with dynamic call behaviours. Network Simulator 3 was used for the simulations to measure the performance of the Pre-CAC scheme using throughput, call rejection rate and resource utilization as performance metrics. Comparing the Pre-CAC scheme with its reference model (ECACS), Pre-CAC scheme displayed improved results for public safety voice calls; throughput was enhanced by 3.06%, percentage resource utilization improved by 0.12% and call rejection rate was decreased by 6.38%. The results show that during emergencies, Pre-CAC scheme can efficiently manage congestion and enhance communication of critical calls in long term evolution (LTE)-based Public Safety Networks (PSN).
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