It is a novel fuzzy based sleep mode technique for WSN that turns off the ONUs

(placed at the customer premises) when certain traffic conditions are verified. The objective is to

achieve an improved energy efficiency without impacting too much the Quality of Service

perceived by end-users. The whole operation is managed at the central Node and the length of the sleep time periods is computed employing a statistical method.-It is a novel fuzzy based sleep mode technique for WSN that turns off the ONUs

(placed at the customer premises) when certain traffic conditions are verified. The objective is to

achieve an improved energy efficiency without impacting too much the Quality of Service

perceived by end-users. The whole operation is managed at the central Node　and the length of the sleep time periods is computed employing a statistical method.