<?xml version="1.0" encoding="UTF-8"?> <article key="pdf/3894" mdate="2008-03-21 00:00:00"> <author>Muhammad T. Alam and Zheng Da Wu</author> <title>Admission Control Approaches in the IMS Presence Service</title> <pages>943 - 958</pages> <year>2008</year> <volume>2</volume> <number>3</number> <journal>International Journal of Computer and Information Engineering</journal> <ee>https://publications.waset.org/pdf/3894</ee> <url>https://publications.waset.org/vol/15</url> <publisher>World Academy of Science, Engineering and Technology</publisher> <abstract>In this research, we propose a weighted class based queuing (WCBQ) mechanism to provide class differentiation and to reduce the load for the IMS (IP Multimedia Subsystem) presence server (PS). The tasks of admission controller for the PS are demonstrated. Analysis and simulation models are developed to quantify the performance of WCBQ scheme. An optimized dropping time frame has been developed based on which some of the preexisting messages are dropped from the PSbuffer. Cost functions are developed and simulation comparison has been performed with FCFS (First Come First Served) scheme. The results show that the PS benefits significantly from the proposed queuing and dropping algorithm (WCBQ) during heavy traffic.</abstract> <index>Open Science Index 15, 2008</index> </article>