Abstract
This paper proposes an energy-saving passive optical network framework (ESPON) that aims to incorporate optical network unit (ONU) sleep/doze mode into dynamic bandwidth allocation (DBA) algorithms to reduce ONU energy consumption. In the ESPON, the optical line terminal (OLT) schedules both downstream (DS) and upstream (US) transmissions in the same slot in an online and dynamic fashion whereas the ONU enters sleep mode outside the slot. The ONU sleep time is maximized based on both DS and US traffic. Moreover, during the slot, the ONU might enter doze mode when only its transmitter is idle to further improve energy efficiency. The scheduling order of data transmission, control message exchange, sleep period, and doze period defines an energy-efficient scheme under the ESPON. Three schemes are designed and evaluated in an extensive FPGA-based evaluation. Results show that whilst all the schemes significantly save ONU energy for different evaluation scenarios, the scheduling order has great impact on their performance. In addition, the ESPON allows for a scheduling order that saves ONU energy independently of the network reach.
Highlights
Passive Optical Networks (PONs) have been widely considered as the most favorable access network architecture to cater for the growing demand of bandwidth-hungry applications
This paper proposes an energy-saving PON (ESPON) framework that aims at saving optical network unit (ONU) energy through cyclic sleep
The ESPON framework is a set of schemes for allocating bandwidth and at the same time scheduling ONU sleep/doze periods which are all based on the extension
Summary
Passive Optical Networks (PONs) have been widely considered as the most favorable access network architecture to cater for the growing demand of bandwidth-hungry applications. As data frames must be buffered during ONU sleep/doze periods, cyclic sleep brings out a clear trade-off between energy-savings and frame delay and/or frame loss performance. The authors in [8] proposed an Adaptive Delay-Aware Energy-Efficient scheme (ADAEE) that aims at maximizing ONU energy-savings based on DS transmission. Compared to existing studies on energy-efficient PONs, the ESPON minimizes the wake-up overhead time with at most one sleep period scheduled for every ONU in a cycle. In ESPON, the OLT takes into account both DS and US transmissions to allocate bandwidth dynamically and schedule ONU sleep/doze periods. The ESPON framework is a set of schemes for allocating bandwidth and at the same time scheduling ONU sleep/doze periods which are all based on the extension. Of 10G-EPON and are different from one another in the timing of GATE and REPORT messages as well as their grant sizing method
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