A Survey on Cognitive Radio Network Models for optimizing Secondary User Transmission

Radio Spectrum is a Valuable resource and is highly bounded. Due to the massive development and growth of the communication devices it is not possible accommodate all the users within the available spectrum bands. The main reason behind that is some of the frequency bands such as Mobile are over utilized where as some of the frequency bands like radio and TV are underutilized. To make use of the spectrum resources effectively, Cognitive radio technology is considered to be the prominent Solution. Cognitive radio is an intelligent radio/system it senses from the environment and changes its transmission parameters according to the environment. The proposed research article has conducted a survey on different Network models of CR in order to facilitate SU transmission and to enhance the Transmission quality of Secondary Users in terms of various parameters such as throughput, transmission delay, Channel Conflict probability, Channel Loss probability etc.