Enhanced Energy Savings with Adaptive Watchful Sleep Mode for Next Generation Passive Optical Network

Rizwan Aslam Butt, Adnan Akhunzada (), Muhammad Faheem and Basit Raza
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Rizwan Aslam Butt: Department of Telecommunications Engineering, NED University of Engineering, Karachi 75220, Pakistan
Muhammad Faheem: Department of Computer Engineering, Abdullah Gul University, Kayseri 38080, Turkey
Basit Raza: Department of Computer Science, COMSATS University Islamabad (CUI), Islamabad 45550, Pakistan

Energies, 2022, vol. 15, issue 5, 1-17

Abstract: A single watchful sleep mode (WSM) combines the features of both cyclic sleep mode (CSM) and cyclic doze mode (CDM) in a single process by periodically turning ON and OFF the optical receiver (RX) of the optical network terminal (ONT) in a symmetric manner. This results in almost the same energy savings for the ONTs as achieved by the CSM process while significantly reducing the upstream delays. However, in this study we argue that the periodic ON and OFF periods of the ONT RX is not an energy efficient approach, as it reduces the ONT Asleep (AS) state time. Instead, this study proposes an adaptive watchful sleep mode (AWSM) in which the RX ON time of ONT is minimized during ONT Watch state by choosing it according to the length of the traffic queue of the type 1 (T1) traffic class. The performance of AWSM is compared with standard WSM and CSM schemes. The investigation reveals that by minimizing the RX ON time, the AWSM scheme achieves up to 71% average energy saving per ONT at low traffic loads. The comparative study results show that the ONT energy savings achieved by AWSM are 9% higher than the symmetric WSM with almost the same delay and delay variance performance.

Keywords: energy efficient PON; watchful sleep mode; passive optical network; cyclic sleep (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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