An Optimal Reservation-Pool Approach for Guaranteeing the Call-Level QoS in Next-Generation Wireless Networks (original) (raw)
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Adaptive call admission control for QoS provisioning in multimedia wireless networks
Computer Communications, 2003
In this paper, we propose a new framework called adaptive quality of service (AdQoS) to guarantee the quality of service (QoS) of multimedia traffic generally classified as real-time and non-real-time. AdQos supports future generation wireless networks because it implements a traffic-based admission control, bandwidth reallocation and reservation schemes to support the different multimedia traffic. The objectives that AdQoS framework tries to accomplish are minimum new call blocking and handoff dropping rates. The key feature of this framework is the bandwidth reallocation scheme. This scheme is developed to control the bandwidth operation of ongoing connections when the system is overloaded. The performance of the system is evaluated through simulations of a realistic cellular environment. Simulation results show that our proposed scheme reduces the new call blocking probabilities, the handoff dropping probabilities and reduces significantly the probability of terminated calls while still maintaining efficient bandwidth utilization compared to conventional schemes proposed in the literature. q 2002 Published by Elsevier Science B.V.
2006 Asia-Pacific Conference on Communications, 2006
pico or micro-sized cells will increase the handoff rate, and thus, leads to higher handoff dropping rate The allocation of scarce resources to support real-that makes QoS guarantees to the multimedia services time multimedia services with different Quality of difficult. Multimedia services impose stringent QoS Service (QoS) requirements is a fundamental problem demands on the wireless networks. in wireless cellular networks. In this paper, we In wireless cellular networks, user' s QoS propose a new Call Admission Control (CAC) and requirements can be quantitatively expressed in terms resource reservation scheme for cellular-based of probabilistic connection-level QoS parameters such multimedia wireless networks. The well-known CAC as Call Blocking Probability (CBP) and Call Dropping guard channel policy [3] is modified to be applicable Probability (CDP) [2]. Therefore, one of the most for different traffic classes with diverse QoS important connection-level QoS issues is how to requirements. The proposed scheme is modeled as reduce and control CDP due to the lack of available M/MI/CC queueing system and the performance bandwidth so that mobile users can continue their measures, call blocking probability and call dropping ongoing connections. Efficient Call Admission Control probability are computed. (CAC) and Bandwidth Reservation (BR) schemes are necessary to maintain the desired QoS. CAC schemes
2010
This paper describes an adaptive scheme for Call Admission Control (CAC) for multi-class service wireless cellular networks. The proposed CAC scheme can be achieved through call bandwidth borrowing and call preemption techniques according to the priorities of the traffic classes, using complete sharing of the available bandwidth. However, the CAC scheme maintains QoS in each class to avoid performance deterioration through mechanisms for call bandwidth degradation, and call bandwidth upgrading based on fair resource deallocation and allocation. Simulation experiments show that the proposed CAC scheme outperforms existing methods for different QoS metrics.
Priority-based Call Admission Control of multiclasses in Mobile networks
2006
One important thing is to guarantee QoS over wireless infrastructures. Call admission control plays a significant role in providing the designed QoS in wireless networks. This paper presents a traffic control scheme for improving QoS, traffic model and performance evaluation are described. We consider a traffic model has K QoS classes and each class has its own priority. Priority-based QoS in this case is described by 0 les beta1 les 1 (1 les i les K) for class i and 0 les beta1 les beta2...les betaK les 1 (the choice of these probabilities betai according to the QoS). New call in each class is admitted or rejected based on the channel occupancy and its priority. Important performance measures of the suggested scheme such as the blocking probability of new call and dropping probability of handoff call are described and evaluated
2006
This paper studies and analyze two call admission control (CAC) schemes in multimedia cellular wireless networks. These call admission control algorithms are studied for different network configurations. These configurations include, employing the queuing techniques for voice handoff with finite lifetime, differentiating between voice and data calls in terms of the average channel holding time, data bandwidth requirements, and employing queuing techniques for voice handoff and data handoff calls with finite lifetime. The main contribution of this paper is the development of an analytical model for each of the two CAC algorithms specified in this study. In addition to the call blocking and termination probabilities which are usually cited as the performance metrics, in this work we derive and evaluate other metrics that have not be considered by previous work such as the average queue length, the average queue residency, and the time-out probability for handoff calls. We also develop a simulation tool to test and verify our results. Finally, we present numerical examples to demonstrate the performance of the proposed CAC algorithms and we show that analytical and simulation results are in total agreement.
Dynamic call admission control scheme for QoS priority handoff in multimedia cellular systems
2002
Abstract A dynamic call admission control (CAC) and its associated resource reservation (RR) schemes are proposed in this research based on the guard channel (GC) concept for a wireless cellular system supporting multiple quality of service (QoS) classes. The proposed CAC policy selects the resource access threshold according to the estimated number of incoming call requests of different QoS classes.
Adaptive Call Admission Control for Multimedia Wireless Networks with QoS Provisioning
This paper introduces a novel Quality of Service Adaptive Call Admission Control (QoS-AdCAC) framework for next generation broadband wireless cellular networks supporting wireless multimedia services with different classes of traffic and diverse bandwidth requirements. In this work, each base station locally, independently of other base stations in the network, differentiates between new and handoff calls for each class of traffic by assigning a threshold to each class according to its QoS requirements. The threshold values change dynamically in order to respond to the varying traffic conditions. The main feature of the proposed framework is its ability to simultaneously achieve several design goals, which makes it suitable for real time execution. Simulation results show the strength of our proposed framework.
Global Telecommunications Conference, . GLOBECOM . IEEE, 2004
Providing multimedia services with quality of service (QoS) guarantees in next generation wireless cellular networks poses great challenges due to the scarce radio bandwidth. Effective call admission control (CAC) is important for the efficient utilization of the limited bandwidth. In this paper we present an optimal Markov decision-based call admission control (MD-CAC) policy for the multimedia services that characterize the
Call Admission Control algorithm for Wireless Multimedia Networks
Wireless multimedia networks are becoming increasingly popular as they provide users the convenience of access to information and services anytime, anywhere and in any format. The upcoming wireless cellular infrastructures such as third generation (3G) and fourth generation (4G) are deemed to support new high-speed services with different Quality-of-Service (QOS) and their respective traffic profiles. Different wireless multimedia services have diverse bandwidth and QOS requirements, which need to be guaranteed by the wireless cellular networks. The call admission control algorithm deals with multiple classes of calls having different requirements, requesting different Quality of Service (QOS) and with different priorities for admission into the network. In this paper we present a Adaptive Call admission Control algorithm for the next generation of wireless cellular networks at the connection level, where the bandwidth allocated to the ongoing calls can be dynamically adjusted by Bandwidth up gradation and degradation algorithms. This framework supports establishing a priority mechanism for handoff calls over new calls and also establishing a priority mechanism for different types of traffic classes (CBR, VBR, UBR). The performance of proposed adaptive CAC algorithm is evaluated based on the New Call Blocking Probability, Hand off Call Dropping rate with the existing CAC algorithm for wireless multimedia networks. By simulation results it is shown that our proposed algorithm achieves less New Call Blocking Probability, Hand off Call Dropping rate for different traffic classes.
Wireless Personal Communications, 2008
Next generation of wireless cellular networks aim at supporting a diverse range of multimedia services to Mobile Terminal (MT) with guaranteed Quality of Service (QoS). The challenge is to maintain the playing continuity of multimedia streams during handoff. In this paper, a bandwidth reservation scheme based on mobility prediction is proposed, to enable high accurate prediction of next crossing cell (target cell) which a MT is going to, in order to avoid too early or over reservation resulting in a waste of resources. The amount of bandwidth to be reserved is dynamically adjusted according to (a) the current position (location) and the extrapolated direction of MT and; (b) the sector and zones of the cell. A Call Admission Control scheme (CAC) is also considered to further guarantee the QoS of real time traffic. The performance of the system is evaluated through discrete event simulation of the wireless cellular environment. Simulation results show that the proposed scheme as compared to several existing schemes is able to reduce the Handoff Call Dropping Probability (HCDP) of real time traffic and the number of terminated ongoing calls of non-real time traffic. In addition, it is efficient to reduce the number of cancelled reservation and subsequently increase the system bandwidth utilization.