Sleep-aware wavelength and bandwidth assignment scheme for TWDM PON

Area of Science:

• Telecommunications Engineering
• Optical Networks
• Energy Efficiency in Networks

Background:

• Energy efficiency and delay performance in Passive Optical Networks (PONs) are inversely related.
• Conventional Dynamic Bandwidth and Wavelength Assignment (DWBA) schemes are inefficient with Cyclic Sleep Mode (CSM), wasting bandwidth and degrading performance.
• Optical Network Units (ONUs) in Asleep state cause traffic queues, increasing upstream delays.

Purpose of the Study:

• To develop a sleep-aware DWBA (SA-DWBA) scheme for TWDM PONs that optimizes energy efficiency and delay performance.
• To coordinate DWBA with CSM by assigning bandwidth only to Active ONUs.
• To improve wavelength switching and traffic load balancing by considering only Active state ONUs.

Main Methods:

• Development of a novel sleep-aware DWBA (SA-DWBA) scheme tailored for TWDM PONs operating in CSM.
• Implementation of bandwidth allocation strategies that exclusively assign resources to Active ONUs during different allocation phases.
• Optimization of wavelength switching processes by prioritizing Active ONUs for traffic load balancing.

Main Results:

• The SA-DWBA scheme achieves 50% to 65% higher energy savings compared to conventional DWBA schemes due to extended ONU Asleep times.
• Bandwidth waste is minimized by preventing allocations to ONUs in the Asleep state.
• Upstream delays for all traffic classes are maintained within the acceptable limit of 50 ms.

Conclusions:

• The proposed SA-DWBA scheme effectively enhances energy efficiency in TWDM PONs without compromising delay performance.
• Coordinating DWBA with CSM through sleep-awareness is crucial for optimizing resource utilization and power saving.
• The SA-DWBA scheme presents a viable solution for energy-efficient and performant TWDM PONs.