Call Admission Control Optimization in WiMAX Networks

• Published in: IEEE transactions on vehicular technology Vol. 57; no. 4; pp. 2509 - 2522
• Main Authors: Bo Rong, Yi Qian, Kejie Lu, Hsiao-Hwa Chen, Guizani, M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Access methods and protocols, osi model; Admission control; Algorithms; Applied sciences; Approximation algorithms; Cables; Call admission control; Call admission control (CAC); Computer simulation; Demand; Downlink; DSL; Exact sciences and technology; Information, signal and communications theory; Internet; IP networks; Microwave technology; Multiplexing; Networks; Optimization; orthogonal frequency-division multiple access (OFDMA); Policies; Signal and communications theory; Systems, networks and services of telecommunications; Telecommunication traffic; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Teletraffic; time-division duplex (TDD); Transmission and modulation (techniques and equipments); WiMAX; worldwide interoperability for microwave access (WiMAX); WiMAX; OFDMA; call admission control; TDD; optimization; Access control; Performance evaluation; time- division duplex (TDD); Wireless telecommunication; Optimization method; Optimal policy; Frequency division multiple access; Equity; Downlink; Traffic load; Interoperability; Call admission control (CAC); worldwide interoperability for microwave access (WiMAX); Subscriber; Power system load; Uplink; High rate transmission; Teletraffic; Algorithm; Constrained optimization; orthogonal frequency-division multiple access (OFDMA); Internet access; Overload; Orthogonal frequency division multiplexing; System simulation; Long distance transmission; Effectiveness factor
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2007.912595

Worldwide interoperability for microwave access (WiMAX) is a promising technology for last-mile Internet access, particularly in the areas where wired infrastructures are not available. In a WiMAX network, call admission control (CAC) is deployed to effectively control different traffic loads and prevent the network from being overloaded. In this paper, we propose a framework of a 2-D CAC to accommodate various features of WiMAX networks. Specifically, we decompose the 2-D uplink and downlink WiMAX CAC problem into two independent 1-D CAC problems and formulate the 1-D CAC optimization, in which the demands of service providers and subscribers are jointly taken into account. To solve the optimization problem, we develop a utility- and fairness-constrained optimal revenue policy, as well as its corresponding approximation algorithm. Simulation results are presented to demonstrate the effectiveness of the proposed WiMAX CAC approach.