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A Combined Call Control Algorithm based on Moving Speed and Bandwidth in Hierarchical Cellular Systems  

Park, Jeong-Eun (Dept.of Computer, Ewah Wonan's University)
Chae, Ki-Joon (Dept.of Computer, Ewah Wonan's University)
Publication Information
Journal of KIISE:Information Networking / v.29, no.3, 2002 , pp. 299-313 More about this Journal
Abstract
Recently, the demand for mobile communications and multimedia services has rapidly increased so that conventional cellular system cannot fulfill the requirement of users (capacity and QoS) any more. Therefore, the hierarchical cellular system has been suggested in order to guarantee the QoS and to admit large population of users. IMT-2000 adopts the hierarchical cellular structure, which requires a call control algorithm capable of manipulating and utilizing the complicated structure of hierarchical cellular structure with handiness and efficiency. In this thesis, as an improvement of conventional combined algorithm, a new call control algorithm considering the moving speed of terminal and bandwidth is suggested. This algorithm employs buffers and guard channels to reduce the failure rate. Also, this algorithm considers the moving speed of terminal and bandwidth to elevate the efficiency. Furthermore, calls are handled separately according to the moving speeds of terminal and bandwidths to improve the QoS and reduce the handover rate. As an evaluation of the suggested algorithm, a model hierarchical cellular system is constructed and simulations are conducted with various types of traffic. As the result of the simulations, such indices as block rate, drop rate, channel utilization, and the number of inter layer handovers are examined to demonstrate the excellency fo the suggested algorithm.
Keywords
IMT-2000; IMT-2000; Hierarchical Cell; Handover; Call Admission Control;
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