An Analytic study on Link Quality metrics: RSSI, LQI and ETX in Wireless Sensor Network

Entezami, Fariborz and Politis, Christos (2014) An Analytic study on Link Quality metrics: RSSI, LQI and ETX in Wireless Sensor Network. In: Wireless World Research Forum Meeting 32; 20-22 May 2014, Marrakech, Morocco.


Routing protocol plays an important role in data communication. Wireless Sensor Network (WSN) is used in the scenarios that need to use efficient routing protocols. One issue in term of efficiency in routing protocols in WSNs is energy consumption. Radio Frequency (RF) modules consumed most of energy in wireless sensors and focusing on this part could make an impact of increasing system lifetime. Metrics is an important part in any routing protocol. Most efficient metrics need to send packets to maintain link quality measurement by using RF module. Link quality may be measured by receiving packets and then save energy. Using Received signal strength indication (RSSI) or Link Quality Indication (LQI) of received packets does not need to use RF module to send packets to measure the link quality. In this paper, symmetry of RSSI and LQI in two directions have been studied and also relation between Expected Transmission Count (ETX), RSSI and LQI as link quality metrics. The evaluation in this paper is based on a series of WSN testbeds in real scenarios. The collected data from testbed shows symmetry in RSSI in both directions and also a significant correlation between RSSI and distance that makes it a capable link quality metric to be employed in routing protocols for devices that work in limited resources scenarios.

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