4 research outputs found
Performance Evaluation of Finite-Source Cognitive Radio Networks with Impatient Customers
The current paper takes into consideration a cognitive radio network with impatient customers, by the help of finite-source retrial queueing system. We consider two different types of customers (Primary and Secondary) assigned to two interconnected frequency bands. A first frequency band with a priority queue and a second one with an orbit, both are respectively dedicated for the Primary Users (PUs) and Secondary Users (SUs). In case the servers are busy, both customers (Licensed and Unlicensed) join either the queue or the orbit. Before joining the orbit, secondary customers receive a random retrial time according to exponential distribution, which is the holding time before the next retry. Unlicensed users (impatient) are obliged to leave the system once their total waiting time exceeds a given maximum waiting time. The novelty of this work is the investigation of the abandonment and its impact on several performance measures of the system such as the mean response time and waiting time of users, probability of abandonment of SU, etc. Several figures illustrate the problem in question by the help of simulation
Performance evaluation of finite-source Cognitive Radio Networks with impatient customers
The current paper takes into consideration a cognitive radio network with
impatient customers, by the help of finite-source retrial queueing system. We
consider two different types of customers (Primary and Secondary) assigned
to two interconnected frequency bands. A first frequency band with a priority
queue and a second one with an orbit, both are respectively dedicated for the
Primary Users (PUs) and Secondary Users (SUs). In case the servers are
busy, both customers (Licensed and Unlicensed) join either the queue or the
orbit. Before joining the orbit, secondary customers receive a random retrial
time according to Exponential distribution, which is the holding time before
the next retry. Unlicensed users (impatient) are obliged to leave the system
once their total waiting time exceeds a given maximum waiting time.
The novelty of this work is the investigation of the abandonment and its
impact on several performance measures of the system such as the mean response
time and waiting time of users, probability of abandonment of SU, etc.
Several figures illustrate the problem in question by the help of simulation