A fuzzy decision scheme for relay selection in cooperative wireless sensor network

Abstract

In energy-constrained military wireless sensor networks, minimizing the bit error rate (BER) with little compromise on network lifetime is one of the most challenging issues. This paper presents a new relay selection based on fuzzy logic (RSFL) scheme which provides balance between these parameters. The proposed scheme considers node's residual energy and path loss of the relaydestination link as the input parameters for the selection of the relay node.The relay node selection by fuzzy logic is based on prioritizing higher residual energy and minimum path loss. To evaluate the performance on wireless sensor network, we compare the proposed scheme with the three existing relay selection strategies, ie, random, maximum residual energy based relay selection (MaxRes), and minimum energy consumption based relay selection (MinEnCon). The simulation results of the proposed scheme in terms of network lifetime, BER, Network Survivability Index (NSI), and average energy of network nodes have been presented and compared with different relay selection schemes. The simulation results show that the proposed RSFL scheme has the lowest BER, moderate network lifetime, average energy, and NSI. KEYWORDSbit error rate, cooperative communication, network lifetime, Network Survivability Index, random relay selection, residual energy, wireless sensor networks | INTRODUCTIONWireless sensor network is widely used in many applications and services such as industry, mines, health, military, agriculture, Internet of Things (IoT), and home automation. [1][2][3][4] The wireless channel which is used for communication becomes unreliable due to noise, fading, reflections, distortion, and installation of antennas. In order to minimize the effects of these distortions, various solutions have been proposed such as cooperative communication, energy harvesting, multiple antennas etc. The design of wireless sensor network depends on the specific application.In military battle ground, the communication may be interrupted due to nodes are attacked by enemy troops. If some nodes are destroyed by the enemy, then it is very difficult to send important information to the destination node. 5 Maintaining the reliable communication between the nodes is a key preference for the security point of view. In such situation, cooperative communication emerges as a vital solution where noninterrupted, error free data reception, network survivability, and lifetime are the prime issues. These issues can be address by the selection of an appropriate intermediate node in cooperative wireless sensor networks.

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