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Frotan M D, Omid M S. A New CAC Method for IEEE802.11 Access Point based on Session Initiation Protocol. JOTS 2024; 2 (2) :135-148
URL: http://jots.knu.edu.af/article-1-41-en.html

Call admission control CAC in wireless networks has been receiving a great deal of attention during the last two decades due to the growing popularity of wireless communications. CAC method plays central role in QoS provisioning in terms of the signal quality, call blocking and dropping probabilities, packet delay, jitter, loss rate and bandwidth. Due to the limited capacity of the network, making more calls through the network which increases the transmission delay and packet delay and cause a decline in service quality. So, in this project considering the network capacity, Call Admission Control prevents the new Calls to Provide the appropriate service. It is difficult to detect the access point capacity, so we use a simple CAC method in this thesis, according to ACK Failure rate in Access Point. ACK Failure rate is equal to failed ACK in a unit time which indicates network congestion. In the proposed project the module is on OpenSip software and it receives the values of errors from access point and makes decision for SIP server whether to accept or reject the calls. The results show that the proposed method of call admission control provides appropriate quality to users.