Performance Analysis of a Threshold-based Call Admission Control Scheme for Multimedia Wireless Networks (original) (raw)
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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 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.
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
Bandwidth reservation policy for multimedia wireless cellular networks and its analysis
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This paper examines quality of service (QoS) guarantees for mobile users in future wireless cellular networks supporting multiple classes of traffic with focus on reducing dropped handoff connections. We achieve this by proposing a threshold-based bandwidth reservation policy. The policy gives priority to handoff calls over new calls and prioritizes between different classes of handoff calls according to their QoS
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.
Call admission control for mobile multimedia wireless networks
2002
Abstract-Call Admission Control (CAC) policies in mobile cellular wireless networks give priority to handoff requests over new call requests. In the guard channel policy, an integer number of channels are reserved for handoff calls, while the fractional guard channel policy rejects new calls with a probability that varies with the current channel occupancy. The effect of reservations on new and handoff call blocking probabilities has previously been studied for a single service class only.
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.
Lecture Notes in Computer Science, 2002
In order to provide the guaranteed mobile QoS (Quality-of-service) for arriving multi-class calls, we need to minimize the dropping rate of handoff calls while at the same time controlling the blocking rate of new calls. This paper proposed a new multi-class call admission control mechanism that is based on dynamically formed reservation pool for handoff requests. The simulation results show that the individual QoS criteria of multi-class traffic such as the handoff call dropping probability can be achieved within a targeted objective and the new call blocking probability is constrained to be below a given level. The proposed scheme is applicable to channel allocation of multi-class calls over high-speed multimedia wireless networks.
Call admission control in wireless multimedia networks
2003
This paper addresses the call admission control problem for the multimedia services that characterize the third generation of wireless networks. In the proposed model each cell has to serve a variety of classes of requests that differ in their traffic parameters, bandwidth requirements and in the priorities while ensuring proper quality of service levels to all of them. A Semi Markov Process is used to model multi-class multimedia systems with heterogeneous traffic behavior, allowing for call transitions among classes. It is shown that the derived optimal policy establishes state-related threshold values for the admission policy of handoff and new calls in the different classes, while minimizing the blocking probabilities of all the classes and prioritizing the handoff requests. It is proven that in restrictive cases the optimal policy has the shape of a Multi-Threshold Priority policy, while in general situations the optimal policy has a more complex shape.
Optimal call admission control and bandwidth adaptation in multimedia cellular mobile networks
Proc. ASMTA
Third and future generations of cellular mobile networks are designed to provide adaptive multimedia services with QoS guarantees. In this scenario call admission control and bandwidth adaptation work together in order to improve the system's performance by reducing blocking probability of multimedia calls. However, this improvement is done at cost of the QoS degradation of ongoing multimedia calls, which may be unacceptable to the users of real time services as videoconference, videophone, so on. Another problem concerns with the bandwidth adaptation is that it may consume a lot of wireless and wireline resources due to extra signalling overhead as well as battery power in the mobile station. In addition, frequent bandwidth switching among different bandwidth levels may be worse than a large degradation ratio. Thus, an important aspect to be considered in the design of Radio Resource Management is how to optimize the system's performance by minimizing blocking probability, controlling bandwidth adaptation, and maximizing user's satisfaction. In this paper we address this subject by proposing a Semi-Markov Decision Model that seeks an optimal stationary policy that match this goal. Results show that the optimal policy outperforms the performance of a non-optimal adaptive resource allocation scheme that seeks only to improve blocking probability.