Admission Control for QoS Provision in Mobile Wireless Networks

Admission Control for QoS Provision in Mobile Wireless Networks

Georgios I. Tsiropoulos (National Technical University of Athens, Greece), Dimitrios G. Stratogiannis (National Technical University of Athens, Greece), John D. Kanellopoulos (National Technical University of Athens, Greece) and Panayotis G. Cottis (National Technical University of Athens, Greece)
DOI: 10.4018/978-1-61520-771-8.ch017
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Admission control is one of the key elements for ensuring the quality of service (QoS) in modern mobile wireless networks. Since such networks are resource constrained, supporting multimedia traffic guaranteeing its QoS levels is excessively challenging for call admission control (CAC) design. CAC is the most important radio resource management (RRM) function in wireless networks as its efficiency has a direct impact on network performance and QoS provision to end users. The goal of this chapter is to provide a thorough study of the basic concepts considering CAC design and a comprehensive analysis of the fundamental CAC schemes employed in wireless networks. The basic performance criterion considering CAC schemes is the probability of denying the access to the network for an arriving call, which is extensively studied in this chapter. Moreover, additional performance criteria are presented and discussed, which may help to provide an overall efficiency estimation of the available CAC schemes.
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Quality of Service (QoS) provision in wireless networks is closely related to the exploitation of network available resources and the maximization of the number of users. The increasing demand for multimedia services combined with the limited resources of wireless networks urge for efficient admission control schemes that achieve a competent resource management along with appropriate QoS levels for end users. Call Admission Control (CAC) algorithms are employed to ensure that the admission of a new call into a resource limited network does not violate the Service Level Agreements (SLAs) concerning ongoing calls. Any service session supported by the network can be considered as call. An efficient admission control policy should accomplish the following:

  • establish a robust priority assigning mechanism for handoff calls and different Service Class (SC) calls,

  • exhibit a low Call Blocking Probability (CBP),

  • manage a fair resource allocation,

  • achieve a high network throughput and

  • avoid congestion.

CAC schemes for wireless networks have been widely studied under different network architectures and network administrator policies. To apply a specific call admission policy, the various call types are classified into SCs with precise characteristics and QoS demands. Each SC call is treated differently depending on the criteria set according to the operating principles adopted for the admission procedure. The majority of CAC schemes base their admission criteria on an efficient resource management, accounted for either in terms of channels or of bandwidth units. The methods proposed usually set thresholds related to the desirable QoS for high priority SCs and handoff calls. The last trend in such schemes proposes the use of adjustable admission probabilities for low priority SC calls combined with thresholds for the dynamic handling of the input traffic.

Other CAC schemes examine Signal to Noise Ratio (SNR) levels to determine an admission criterion satisfying the QoS demands of end users. Such schemes have to deal with propagation and mobility issues. Under high traffic network conditions, an efficiency enhancing module may be incorporated into the CAC schemes employed renegotiating the resource allocation of ongoing calls. Through QoS re-negotiation and resource re-allocation, available resources can be retrieved to serve a high priority SC call request. The admission decision may also be controlled according to dynamic changes in call pricing, providing at the same time a stream flow management.

Finally, a critical issue in admission control is the performance evaluation of the proposed schemes to assess the provided QoS. The evaluation is performed under appropriate criteria. The metric studied most in the literature is CBP. Assigning priorities to certain call types causes a serious side effect, as certain SCs may monopolize the network resources leading to an unfair treatment of low priority SC calls. Thus, in shared resources networks, fairness among users of the same SC subjected to different channel conditions with different mobility characteristics and among users of different SCs should be investigated employing appropriate metrics. A call admission request represents potential revenue for the network operator. Thus, CAC schemes should be further evaluated employing performance metrics based on optimal pricing to maximize revenues. The above criteria constitute a thorough performance evaluation of admission control policies providing QoS in wireless multiservice networks.

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Table of Contents
Vasileios Vitsas
Thomas D. Lagkas, Pantelis Angelidis, Loukas Georgiadis
Chapter 1
Thomas D. Lagkas
The recent evolution of wireless networking has led the market to increased service demands. Thus, the emerged necessity is to develop specialized... Sample PDF
Hybrid Approach to Integrated QoS Capable Protocols for Wireless LANs
Chapter 2
E. Kartsakli, J. Alonso-Zárate, L. Alonso, C. Verikoukis
Distributed Queueing Collision Avoidance (DQCA) is an efficient MAC protocol designed for infrastructure Wireless LANs. In this chapter, a thorough... Sample PDF
Cross-Layer Scheduling with QoS Support over a Near-Optimum Distributed Queueing Protocol for Wireless LANS
Chapter 3
Der-Jiunn Deng, Yueh-Ming Huang, Hsiao-Hwa Chen
In order to obtain better Quality-of-Service (QoS) requirements for multimedia traffic, the 802.11TGe has proposed HCF Controlled Channel Access... Sample PDF
Delay Constrained Admission Control and Scheduling Policy for IEEE 802.11e HCCA Method
Chapter 4
Nizar Zorba, Christos V. Verikoukis
The use of real-time delay-sensitive applications in wireless systems has significantly increased during the last years. Consequently, the demand to... Sample PDF
Quality of Service in Heterogeneous Traffic Wireless Systems
Chapter 5
Huifang Feng, Maode Ma
The predictability of network traffic is an important and widely studied topic because it can lead to the solutions to get more efficient dynamic... Sample PDF
Traffic Prediction over Wireless Networks
Chapter 6
Carolina Blanch Perez del Notario, Sofie Pollin, Tong Gan, Claude Desset, Antoine Dejonghe, Bart Masschelein
A major limitation for wireless video communication on portable devices is the limited energy budget. For this reason, efficient usage of the scarce... Sample PDF
Cross-Layer Optimization for Energy-efficient QoS Support of Multimedia Streams
Chapter 7
Vasileios Gkamas, Panagiotis Kokkinos, Emmanouel Varvarigos
This chapter describes routing and medium access control (MAC) mechanisms for providing Quality of Service (QoS) together with energy savings in... Sample PDF
QoS and Energy Saving Routing and MAC Mechanisms for Wireless Networks
Chapter 8
Alexandros Kaloxylos, Sarantis Paskalis, Dimitra Vali, Anthony Boucouvalas
Researchers are trying to find viable means to support the quality of services for fixed IP users for quite some time. This is a difficult task and... Sample PDF
Mobility Management and QoS Support in Wireless Environments: Trends and Open issues
Chapter 9
Filippo Cacace, Giulio Iannello, Luca Vollero
Large deployments of access points in wireless local area networks (WLANs) based on the IEEE 802.11 standard require management, configuration and... Sample PDF
Management, Monitoring and QoS in Multi-cell Centralized WLANs
Chapter 10
Marek Natkaniec, Katarzyna Kosek-Szott, Szymon Szott
The chapter contains an overview of existing QoS solutions for multi-hop ad-hoc networks. Firstly, an introduction and short motivation are... Sample PDF
QoS Support in Multi-hop Ad-hoc Networks
Chapter 11
Pierre Leone, Luminita Moraru, Sotiris Nikoletseas, Jose D. P. Rolim
The authors study the problem of fast and robust data propagation in wireless sensor networks in the presence of obstacles obstructing... Sample PDF
Efficient Obstacle Avoidance for Sensory Data Propagation in Wireless Systems
Chapter 12
Vinod Mirchandani, Ante Prodan, Olivier Marcé
A grand challenge in Multi-Radio Wireless Mesh Networks (MR-WMN) is to limit the interference such that its net capacity increases without... Sample PDF
TPC and Non-TPC Based Topology Control Approaches for QoS Improvement in MR-WMN
Chapter 13
Maode Ma, Jinchang Lu
Quality of service (QoS) provisioning is an important issue in the deployment of broadband wireless access networks e.g. WiMAX (IEEE Std... Sample PDF
QoS Support Mechanisms in WiMAX
Chapter 14
Dimitrios G. Stratogiannis, Georgios I. Tsiropoulos, John D. Kanellopoulos, Panayotis G. Cottis
Fourth generation (4G) wireless networks aim at supporting various multiservice applications over IP architectures which satisfy enhanced users... Sample PDF
4G Wireless Networks: Architectures, QoS Support and Dynamic Resource Management
Chapter 15
Katarzyna Wac, Melanie Hilario, Bert-Jan van Beijnum, Richard Bults, Dimitri Konstantas
The success of emerging mobile services depends on the serviceability of the underlying wireless networks, expressed in terms of Quality of Service... Sample PDF
QoS-Predictions Service: QoS Support for Proactive Mobile Services
Chapter 16
Dimitris E. Charilas, Athanasios D. Panagopoulos, Philip Constantinou
This chapter addresses the critical issue of Quality of Service (QoS) provisioning in next generation wireless networks. While the QoS offered to... Sample PDF
Enhanced QoS through Cooperating Schemes in Next Generation Wireless Networks
Chapter 17
Georgios I. Tsiropoulos, Dimitrios G. Stratogiannis, John D. Kanellopoulos, Panayotis G. Cottis
Admission control is one of the key elements for ensuring the quality of service (QoS) in modern mobile wireless networks. Since such networks are... Sample PDF
Admission Control for QoS Provision in Mobile Wireless Networks
Chapter 18
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The plethora of mobile multimedia services that are expected to face high penetration, poses the need for the deployment of a resource economic... Sample PDF
Efficient Power Allocation in E-MBMS Enabled 4G Networks
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