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Author: Wenlong Ni
Publisher:
ISBN:
Category : Markov processes
Languages : en
Pages : 286
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Book Description
This dissertation investigates the optimal call admission control (CAC) policies for Non Priority Scheme (NPS) and Reserved Channel Scheme (RCS) in wireless cellular networks for the following cases: 1. Homogenous traffic in a cell; 2. Multimedia traffic in a cell; 3. Homogenous traffic in a network; 4. Multimedia traffic in a network. Both new call and handoff call arrival processes are assumed to be Poisson processes, and the call holding times are exponentially distributed with different rate for new calls and handoff calls. Admitting each call would bring a reward to the network provider but holding each call in the system would also incur some cost to the provider. This dissertation focuses on the optimization problem of when to admit or reject a call in order to achieve the maximum reward. By establishing an infinite horizon discounted Semi Markov Decision Process (SMDP) model, this research verifies that the optimal policies of all the four cases mentioned above are state-related control policies for NPS as well as RCS. More over, this research also finds that optimal control policy for Case (1) above is still state-related control policy even if the combined arrival process for new and handoff calls are described by General Distribution. The numerical results presented in this dissertation in both tables and diagrams for all of the above cases are consistent with the theoretical results derived.
Author: Wenlong Ni
Publisher:
ISBN:
Category : Markov processes
Languages : en
Pages : 286
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Book Description
This dissertation investigates the optimal call admission control (CAC) policies for Non Priority Scheme (NPS) and Reserved Channel Scheme (RCS) in wireless cellular networks for the following cases: 1. Homogenous traffic in a cell; 2. Multimedia traffic in a cell; 3. Homogenous traffic in a network; 4. Multimedia traffic in a network. Both new call and handoff call arrival processes are assumed to be Poisson processes, and the call holding times are exponentially distributed with different rate for new calls and handoff calls. Admitting each call would bring a reward to the network provider but holding each call in the system would also incur some cost to the provider. This dissertation focuses on the optimization problem of when to admit or reject a call in order to achieve the maximum reward. By establishing an infinite horizon discounted Semi Markov Decision Process (SMDP) model, this research verifies that the optimal policies of all the four cases mentioned above are state-related control policies for NPS as well as RCS. More over, this research also finds that optimal control policy for Case (1) above is still state-related control policy even if the combined arrival process for new and handoff calls are described by General Distribution. The numerical results presented in this dissertation in both tables and diagrams for all of the above cases are consistent with the theoretical results derived.
Author: Sanchita Ghosh
Publisher: Springer
ISBN: 3642309976
Category : Technology & Engineering
Languages : en
Pages : 242
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Book Description
Call Admission Control (CAC) and Dynamic Channel Assignments (DCA) are important decision-making problems in mobile cellular communication systems. Current research in mobile communication considers them as two independent problems, although the former greatly depends on the resulting free channels obtained as the outcome of the latter. This book provides a solution to the CAC problem, considering DCA as an integral part of decision-making for call admission. Further, current technical resources ignore movement issues of mobile stations and fluctuation in network load (incoming calls) in the control strategy used for call admission. In addition, the present techniques on call admission offers solution globally for the entire network, instead of considering the cells independently. CAC here has been formulated by two alternative approaches. The first approach aimed at handling the uncertainty in the CAC problem by employing fuzzy comparators. The second approach is concerned with formulation of CAC as an optimization problem to minimize call drop, satisfying a set of constraints on feasibility and availability of channels, hotness of cells, and velocity and angular displacement of mobile stations. Evolutionary techniques, including Genetic Algorithm and Biogeography Based Optimization, have been employed to solve the optimization problems. The proposed approaches outperform traditional methods with respect to grade and quality of services.
Author: Nazmus Saquib
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Novella Bartolini
Publisher:
ISBN:
Category : Cell phone systems
Languages : en
Pages : 27
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Book Description
In this paper, a non-preemptive prioritization scheme for access control in cellular networks is analyzed. The research for the best call admission policy is carried out by means of a Markov Decision Process (MDP) which allows us to study a very wide class of policies which includes some well known pure stationary policies, as well as randomized ones. The proposed model explicitly incorporates the dependency between the hand-off rate and the system state, assuming that the hand-off rate arriving to a cell is proportional to the occupancy level of the adjacent cells. The cutoff priority policy, consisting in reserving a certain number of channels to the high priority stream of requests, is proved to be optimal within this class while using an objective function in the form of a linear combination of some quality of service parameters, when no queueing device is considered. Numerical results confirm the optimality of the cutoff priority policy when queueing of hand-off requests is allowed.
Author: Management Association, Information Resources
Publisher: IGI Global
ISBN: 1613501021
Category : Technology & Engineering
Languages : en
Pages : 2875
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Book Description
Contains the latest research, case studies, theories, and methodologies within the field of wireless technologies.
Author: Adibi, Sasan
Publisher: IGI Global
ISBN: 1615206817
Category : Computers
Languages : en
Pages : 716
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Book Description
"This book further explores various issues and proposed solutions for the provision of Quality of Service (QoS) on the wireless networks"--Provided by publisher.
Author: Wei Song
Publisher: Springer Science & Business Media
ISBN: 1461443792
Category : Technology & Engineering
Languages : en
Pages : 71
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Book Description
The next-generation of wireless communications are envisioned to be supported by heterogeneous networks by using various wireless access technologies. The popular cellular networks and wireless local area networks (WLANs) present perfectly complementary characteristics in terms of service capacity, mobility support, and quality-of-service (QoS) provisioning. The cellular/WLAN interworking is an effective way to promote the evolution of wireless networks. Interworking of Wireless LANs and Cellular Networks focuses on three aspects, namely access selection, call admission control and load sharing to investigate heterogeneous interworking for cellular/WLAN integrated networks. It not only reveals important observations but also offers useful tools for performance evaluation. The unique traffic and network characteristics are exploited to enhance interworking effectiveness. Theoretical analysis and simulation validation demonstrate benefits of cellular/WLAN interworking in real networks. Last but not the least, this brief highlights promising future research directions to guide interested readers.
Author: Maggie Xiaoyan Cheng
Publisher: Springer Science & Business Media
ISBN: 0387290265
Category : Computers
Languages : en
Pages : 655
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Book Description
This book gives a comprehensive presentation of cutting-edge research in communication networks with a combinatorial optimization component. The objective of the book is to advance and promote the theory and applications of combinatorial optimization in communication networks. Each chapter is written by an expert dealing with theoretical, computational, or applied aspects of combinatorial optimization.
Author: Sanchita Ghosh
Publisher: Springer
ISBN: 9783642309984
Category : Computers
Languages : en
Pages : 236
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Book Description
Call Admission Control (CAC) and Dynamic Channel Assignments (DCA) are important decision-making problems in mobile cellular communication systems. Current research in mobile communication considers them as two independent problems, although the former greatly depends on the resulting free channels obtained as the outcome of the latter. This book provides a solution to the CAC problem, considering DCA as an integral part of decision-making for call admission. Further, current technical resources ignore movement issues of mobile stations and fluctuation in network load (incoming calls) in the control strategy used for call admission. In addition, the present techniques on call admission offers solution globally for the entire network, instead of considering the cells independently. CAC here has been formulated by two alternative approaches. The first approach aimed at handling the uncertainty in the CAC problem by employing fuzzy comparators. The second approach is concerned with formulation of CAC as an optimization problem to minimize call drop, satisfying a set of constraints on feasibility and availability of channels, hotness of cells, and velocity and angular displacement of mobile stations. Evolutionary techniques, including Genetic Algorithm and Biogeography Based Optimization, have been employed to solve the optimization problems. The proposed approaches outperform traditional methods with respect to grade and quality of services.
Author:
Publisher:
ISBN:
Category : Digital computer simulation
Languages : en
Pages : 610
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Book Description
