Energy Efficient Adaptive Request Medium Access Control Protocol For Wireless Sensor Networks

Wireless Sensor Network(WSN)is an emerging technology with potential applications in the field of environment and industrial monitoring,health care systems,security systems,smart grid and smart home system and so on.WSN is a distributed network and it is composed of a large number of shared,self-directed,small,low powered devices called sensor nodes.WSN naturally composed of a large number of spatially distributed,petite,battery-operated,embedded devices that are networked to collectively collect,process and convey data to the users.And it has restricted computing and processing capabilities.WSN presents a host of applications and is an emerging choice for wide scale deployment.This thesis focuses on developing the energy efficient medium access control protocol for Wireless Body area sensor networks(WBANs)which is a branch of Wireless Sensor Networks(WSN).Wireless Body Area Networks(WBANs)consist of a number of miniaturized wearable or implanted sensor nodes that are used to monitor important parameters of a patient over long duration of time.For medical applications,these devices are implanted inside the human body to measure and transfer the real time data or audio signals.However,the applications are prone to many challenges like quality of service parameters,scalability,maintainability,network lifetime and many more.In past,research has been carried out on a main challenge that WBANs faces that is of network lifetime,which can be controlled by efficiently utilizing energy of sensor node.Resource efficiency is one of the most important factors that should be considered when developing a MAC protocol in WBANs.Proposed protocol is basically an enhancement in the old protocol.This protocol is developed by following many steps.Firstly the previous protocols were thoroughly studied.We found some drawbacks in those protocols.Those drawbacks are thoroughly discussed in chapter three.On the bases of those studies we propose a new protocol which not only addresses all those problems present in old protocols it also shows better performance as compared to previous protocols in result of simulation.The proposed protocol name is Adaptive Request Medium Access Control Protocol(AR-MAC).This thesis presents a hybrid MAC protocol that takes into consideration the requirements of WBANs networks.Firstly,the requirements of a good MAC protocols have been identified,and various approaches of WBAN MAC protocols are comparatively analyzed based on their merits and demerits.After that a hybrid MAC protocol have been developed which satisfies the WBANs requirements such as Energy efficiency,guaranteed Quality of Service,multiple physical layer support and adaptability to traffic variations.The performances of the proposed protocol are analyzed through energy efficiency average delivery time,RTS/CTS delay and Packet delivery ratio.At last it is shown with the help or simulations that proposed model shows better performance than the conventional ones.