Efficient spectrum handoff in CR network based on mobility, QoS and priority using fuzzy logic and neural network

Cognitive radio is a technology used to improve spectrum utilization by allowing temporary access of unutilized licensed spectrum of primary user (PU) to the secondary user (SU). When the PU appears at the same channel occupied by a SU, the SU has to vacate the channel and find the new channel to resume its transmission. This process of changing a channel is nothing but a spectrum handoff. Spectrum handoff is one of the main challenges in cognitive radio network. In this paper we propose a spectrum handoff based on mobility, quality of service (QoS) and priority. The proposed system mainly focuses on the mobility of SU (114 Km/hr). Based on mobility, intracellular and intercellular handoffs are defined to guarantee quality of service to SU. A novel `Resource Usability Parameter´ is used to prioritize some critical situations in handoff. The proposed algorithm uses fuzzy logic and neural network for efficient handoff decision.