Energy Efficient Architecture to Cognitive Radio Wireless Sensor Networks
Tata Jagannadha Swamy, Thaskani Sandhya, Garimella Ramamurthy · 2012
Cognitive radio has been considered as a key technology for future wireless communications and mobile computing. In this radio technology spectrum play an important role. Effective utilization of frequency spectrum improves the quality of the communication. In this paper we attempt to improve the radio spectrum utilization by proposing radio based wireless networks. Network architecture of a network plays a key factor in improving the efficiency in radio environment. Specifically we propose new spectrum aware network architecture. This paper includes also the novel hierarchical protocols along with heterogeneous and fault tolerant architecture for data dissemination networks. The research area of wireless networks is an advancing technology which has opened new research issues. Its number of applications in various sectors of military and civilian applications has created demand for the design of more efficient and effective wireless networks. The wireless network comprises of number of nodes which are equipped with a radio transceiver. The wireless nodes are constrained in energy supply, computational memory space, speed and bandwidth. In spite of limitations nodes can reliably and accurately report the surrounding environmental changes. These features are exploited in association with radio for improving utilization of radio spectrum. A ''Cognitive Radio'' is a radio that can change its transmitter parameters based on interaction with the environment in which it operates (1). The radio transceiver consists of the radio front-end and the baseband processing unit. The RF technology observes the spectrum and indicates the spectrum holes. In radio there is a co-existence of licensed and unlicensed wireless users in a common area. There are special measures taken so that the usage of licensed user is not interrupted. To improve spectrum utilization by facilitating spectrum sensing in the concept of cognitive radio based wireless sensor has been introduced. In a system the sensing of the spectrum is also done by the networks and forwarded to the base stations. Further the collected information is processed and sent to another network where further spectrum utilization takes place. The entire process is carried out without interfering with the licensed users.