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We address QoS guarantees in a Bluetooth piconet by considering mainly two constraints: the packet deadline and its priority. We evaluate the performances of four intra piconet scheduling schemes: one round robin (1-RR), exhaustive round robin (ERR), limited round robin (LRR) and deficit round robin (DRR), each one combined with our previously proposed local scheduling scheme FP/EDF. We show that...
Real time applications are characterized by their delay bounds. To satisfy the Quality of Service (QoS) requirements of such flows over wireless communications, we enhance the 802.11 protocol to support the Earliest Deadline First (EDF) scheduling policy. Therefore, we develop a Markov chain based analysis modeling the backoff process of the EDF policy. Then, we propose to evaluate the performance...
Real time applications are characterized by their delay bounds. To satisfy the Quality of Service (QoS) requirements of such flows over wireless communications, we enhance the 802.11 protocol to support the Deadline Mono- tonic (DM) scheduling policy. Then, we propose to evaluate the performance of DM in terms of saturation throughput and average medium access delay called average service time. Therefore,...
In this paper, we consider flows with quantitative end-to-end QoS guarantees. We assume that packets are scheduled according to their fixed priority, reflecting the importance degree of one flow; for packets having the same fixed priority on a node, packet with the smallest relative deadline is the first scheduled. This policy is called FP/DM takes into account the deadline requirements. We are interested...
In this paper, we propose a real time scheduling policy over 802.11 DCF protocol called Deadline Monotonic (DM). We evaluate the performance of this policy for a simple scenario where two stations with different delay constraints contend for the channel. For this scenario a Markov chain based analytical model is proposed. From the mathematical model, we derive expressions of the average medium access...
In this paper, we propose a real time scheduling policy over 802.11 DCF protocol called deadline monotonic (DM). We evaluate the performance of this policy for a simple scenario where two stations with different delay constraints contend for the channel. For this scenario a Markov chain based analytical model is proposed. From the mathematical model, we derive the probability distribution of the packet...
Providing QoS in mobile ad-hoc networks (MANETs) is necessary to allow effective communication in context of multimedia data transmission. Reserving the required resources and applying an admission control mechanism is one way to guarantee end-to-end QoS. Nevertheless, such a scheme should take into account the problem of interferences, consequent to the use of the wireless channel. Much work have...
In this paper, we focus on applications with quantitative QoS (quality of service) requirements in their end-to- end response time. Two types of quantitative QoS guarantees can be delivered by a network: deterministic and probabilistic. The deterministic approach is based on a worst case analysis. The probabilistic approach uses a mathematical model to obtain the probability of the response time exceeding...
Efficient communication in Bluetooth networks requires a good design of intra and inter-piconet scheduling solutions. Mathematical performance analysis of such solutions is very important. But, due to the complexity of the Bluetooth MAC, they have been analyzed mostly via simulations. We present analytic results regarding performance evaluation of a Bluetooth piconet, based on the M/G/l queue with...
In this paper, we are interested in comparing local deadline assignment techniques in a multi-hop network supporting real time traffic with end to end delay constraints, when the FP/EDF scheduling is used. In each node, packets are scheduled according to their fixed priorities (FP), and within the same priority, packets are scheduled according to the earliest deadline first (EDF) policy, using local...
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