FUZZY-LOGIC BASED CALL ADMISSION CONTROL FOR A HETEROGENEOUS RADIO ENVIRONMENT
Venkata Ramkumar, Albena Mihovska, Neeli Rashmi Prasad, Ramjee Prasad · 2010
This paper proposes a novel call admission control (CAC) algorithm that considers various types of applications with various QoS parameters requested by a user and provides the required QoS to newly admitted users without a degradation of the QoS to already admitted ones. The proposed CAC is evaluated for a heterogeneous radio access technologies (RATs) scenario. The QoS parameters vary depending on the type of applications and the agreement between the service provider and the user. The proposed CAC is based on a fuzzy logic mechanism that comprises two stages; in the first stage the best cell in each RAT is selected by using a fuzzy linguistic controller, and in the second stage the best RAT based on the user preferences is selected using the fuzzy multiple attribute decision making (MADM) method. The results show that the user is able to select the best cell in each RAT using the cell selection algorithm and the cell admittance factor (CAF) values obtained for each cell in a RAT. The best RAT is selected based on the weights assigned by the user to data rate, latency and BER, mobility and the service cost. The RAT that best fits the user needs is selected from the ranks assigned by the RAT selection algorithm to each RAT.