Improving the performance of wireless sensor networks using eeltmqrp

Abstract

Biomedical wireless sensor network (BWSN) is an integration of sensor network and health application designed for monitoring and assessing patient s health in an affordable manner. The continuous monitoring and assessment provides ease of diagnosis and in-time cure for diseases. BWSN is a collection of body sensors that is implanted inside or placed on the surface of human body. The sensors are capable of sensing changes related to the organ for which it is designed. The sensed information/ data are transmitted to the diagnosis centre or sink through the intermediate/ neighbouring nodes. The communication is organized from the transmitter side using coordinator node. The coordinator node acts as an aggregator and is responsible for data accumulation from different sensors. The coordinator node is a hand-held device such as mobile phone or a body mounted device. It interacts with the sensor nodes to accumulate the information and transmit them to the sink. The coordinator makes use of time-division multiple access (TDMA) or code-division multiple access (CDMA) or both (hybrid) for receiving information from the implanted and surface mounted sensors. The position of the coordinator varies with the movement exhibited by the human; the distance between the coordinator and sink varies accordingly. Therefore, the coordinator node exhibits two-types of communication modes: single-hop and multi-hop. A single-hop communication is observed usually between the body sensors and coordinator and between the coordinator and sink if they are in less proximity. If the proximity between the two increases, then the coordinator performs a multi-hop communication. Biomedical sensors are placed in the positions related to the monitoring part of human body. These sensors observe the physiological changes in temperature, blood pressure, pulse, heart rate, electrocardiogram (ECG) and transmit the same to the coordinator. The information fetched from the sensors is classified as ordinary, reliability-based and emergency depending upon the monitoring and its values. BWSN must ensure reliable information delivery at the sink node for achieving better performance of health applications newline