QTNA

In this paper, we consider single server retrial queues with two way communication. Ingoing calls arrive at the server according to a Poisson process. Service times of these calls follow an exponential distribution. If the server is idle, it starts ...

We mathematically analyze the discontinuous reception (DRX), a power saving mechanism in 3GPP LTE where both downlink and uplink packet arrivals at a user equipment (UE) and an evolved node B (eNB) follow Poisson processes. We construct a 2-dimensional ...

We consider a time slotted cognitive radio network under Rayleigh fading where multiple secondary users (SUs) contend for spectrum usage over available primary users' channels. We analyze the performance of a channel access policy where each SU ...

We suggest a priority discipline for differentiating service levels by customer class. The priority function includes customer arrival time and a class-specific parameter. By adjusting the parameter, the priority discipline controls relative service ...

Here we study large deviations in networks that are more likely to result from the accumulation of many slightly unusual events. We are particularly interested in analyzing large deviations where the most probable path changes direction. These ...

For several specific discrete-time queueing models with a vacation policy, the stationary system occupancy at the beginning of a random slot is distributed as the sum of two independent random variables. One of these variables is the stationary number ...

We consider a single-server retrial queue with a finite number of sources and exponential repeated attempts. This queueing system and its variants are widely used to model disk memory systems, star-like local area networks and other communication ...

Consider a single server retrial queueing system with negative arrival under Coxian phase type service in which customers arrive in a Poisson process with arrival rate λ. The negative arrival rate follows a Poisson distribution with parameter v. Let k ...

Since the utilization of multiuser diversity in wireless networks can increase the information theoretic capacity, much attention has been paid to schedulers exploiting multiuser diversity. It is known that there exists a tradeoff between the capacity ...

We consider an M/G/1 retrial queueing system with two phases of heterogeneous service and a finite number of immediate Bernoulli feedbacks. If an arriving customer finds an idle server, service commences immediately. Otherwise, the blocked customer ...

In this paper, we have obtained explicit expressions for the time dependent probabilities of the M/M/1 queue with server vacations under a waiting server. The corresponding steady state probabilities have been obtained. We also obtain the time dependent ...

A single server batch service finite source queueing model with feedback mechanism has been studied. The inter arrival times and the service times are negative exponential random variables and the service is given in batches of fixed size. For this ...

We consider a discrete time regime-switching risk model, where the claim occurrence probabilities and the claim size distributions depend on the regime of the environment. We assume that the regime is governed by a Markov process with a finite state ...

We consider stochastic discrete event dynamic systems that have time evolution represented with two-dimensional state vectors through a vector equation that is linear in terms of an idempotent semiring. The state transitions are governed by second-order ...

Infinite-server queues are often used as a coupling tool for analyzing many-server systems that arise in telecommunications and call centers. Here we derive an exact asymptotic, up to a constant factor, for the tail probability of the number of ...

In this paper, we present a theoretical and analytical framework to analyze the discrete-time queue in which the on-off of the server is controlled by workload threshold. For this purpose, we consider the discrete-time Geo/G/1 queue under the D-policy. ...

In this paper, we study the workload process of the E_k/G/1 queueing system by the supplementary variable approach. The explicit criteria for the geometric and subgeometric rate of convergence are obtained. We shall also give the parameters: ε₀ for the ...

Contention-Collision Cancellation (C-CC) access control mode is an important access control mode in star network. According to all instances of customer how to contend for service right, how to re-contend for service right after failure, and how to be ...

Checkpoint and rollback scheme can be a good choice on a mobile device for the fault tolerant computing. Since the battery power is one of the most critical resources of a mobile device, it is very important to know the optimal checkpoint interval that ...

In video streaming, feedback-based rate control is utilized for guaranteeing video quality on an end-to-end basis. In this paper, we consider the effect of feed-back based rate controls on video streaming service. Focusing on the receiver buffer of a ...

In this paper we present the analysis of an M/M/c multiple synchronous vacation model. In contrast to the previous works on synchronous vacation model we consider the model with gated service discipline and with independent and identically distributed ...

We consider the allocation of mobile dentistry resources to a scattered population. A cyclic queueing network is used to model the allocation process. The resulting model may be transformed to a geometric program. Numerical results are given.

The objective of this paper is to study the stability analysis of single server retrial queueing system with Erlang-k service under various constraints over the behavior of server and customers, in which customers arrive in a Poisson process with ...

We consider models of queue storage, where items arrive accordingly to a Poisson process of rate λ and each item takes up one cell in a linear array of cells, which are numbered {1, 2, 3,...}. The arriving item is placed in the lowest numbered available ...

Consider a Multi server Retrial queueing system with vacation policies in which arrival rate follows a Poisson distribution with parameter λ and service time follows an exponential distribution with parameter μ. Let c be the number of servers in the ...

A retrial queueing system with two types of customers and with feed back is considered. Type 1 customers arrive in batches of size k with probability c_k and type 2 customers arrive singly according to two Poisson processes with rates [EQUATION] and λ₂ ...

Given the increasing prominent role of multimedia applications in Internet-based services, elucidating the per-stream short term loss behavior of multimedia traffic in the routers is of priority concern. This work attempts to model both tagged ...

Stationary probabilities are fundamental in response to various measures of performance in queueing networks. Solving stationary probabilities in Quasi-Birth-and-Death (QBD) with phase-type distribution normally are dependent on the structure of the ...

In this paper, we consider an M/M/1 queueing system with working vacations and impatient customers, where we examine the case that customers' impatience is due to a working vacation. During the working vacation, customers are served at a slower than ...

A single-server retrial queue with two types of customers in which the server is subject to breakdowns and repairs is studied. Two types of customers arrive to the system in accordance with two different independent Poisson flows. There is no waiting ...