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عنوان فارسی مقاله:
تاخیر عدالت در پیکر بندی مجدد و انرژی کارآمد TWDM PON
عنوان انگلیسی مقاله:
Delay fairness in reconfigurable and energy efficient TWDM PON
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Time- and Wavelength-Division Multiplexed (TWDM) PONs (also known as hybrid TDM-WDM PONs) are currently under standardization by ITU-T as part of the Next Generation PON 2 (NGPON2) [1]. The colorless nature of the ONU transceivers, as proposed in most of the architectures [2], potentially provides better bandwidth utilization and energy savings at the OLT during low traffic through the aggregation of ONUs into a subset of OSUs and the switching to sleep mode of idle OSUs. The first studies on Dynamic Wavelength and Bandwidth Allocation (DWBA) in TWDM-PON focused on schemes and protocols to either minimize the number of utilized wavelengths at the OLT to save energy [3,4] or to hitlessly (i.e., avoiding frame loss) perform wavelength reconfiguration [5,6]. Recently, attention has been focused on DWBAs reducing penalties due to ONU tuning time overhead. For example in [7], a DWBA is proposed that minimizes the number of wavelength reallocations and, as of consequence, the tuning time overhead penalties while attaining fair-ness in distributing traffic to OSUs. Such DWBA is experimentally demonstrated with 512 ONUs in [8]. Furthermore, an automatic load balancing DWBA algorithm has been proposed in [9] that activates load balancing when upstream OSU congestion is detected. The proposed algorithm is also capable of reducing the impact of long ONU tuning times by triggering reconfigurations with a period longer than the ONU tuning time. Finally, in [10] a method for decreasing the latency degradation due to the simultaneous reallocation and tuning of ONUs with different tuning times is presented. However, when DWBA is utilized, if an ONU is tuning, the traffic destined to/originated by the ONU must be buffered. Thus, traffic belonging to tuning ONUs experiences delay, while traffic belonging to non-tuning ONUs keeps being received/transmitted. Therefore the impact of the tuning time overhead on average frame delay is unbalanced toward ONUs which tune. This paper evaluates the impact of such issue on the delay experienced by each ONU. Then, it proposes a DWBA that balances the delay experienced by the ONUs in scenarios where the number of ONUs is small. Such scenarios can encountered at network start-up or when the majority of the ONUs is inactive/sleeping during low traffic regime. The evaluation by means of simulations and experiments, show that the proposed method successfully balance the impact among the ONUs without reducing the achieved energy savings.
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کلمات کلیدی:
PDF]Delay fairness in reconfigurable and energy efficient TWDM PON iranarze.ir/wp-content/uploads/2016/11/E857.pdf Oct 3, 2016 - Delay fairness in reconfigurable and energy efficient TWDM PON ... OSUs helps improving the OLT energy efficiency and balancing the ... Trading energy savings and network performance in - OSA Publishing https://www.osapublishing.org/jocn/abstract.cfm?uri=jocn-7-5-470 Trading Energy Savings and Network Performance in Reconfigurable TWDM-PONs. Koteswararao Kondepu, Luca Valcarenghi, Dung Pham Van, and Piero ... Quasi-Passive Reconfigurable (QPAR) node enabled software ... ieeexplore.ieee.org/document/7340189/ by S Yin - 2015 - Cited by 1 - Related articles Simulations show Intra-PON outperforms regular PON in waiting time, b. ... enabled software-defined and energy-efficient intra-PON optical Flow transmission. Energy saving via dynamic wavelength sharing in WDM-PON - IEEE ... ieeexplore.ieee.org/document/6524895/ by R Wang - 2013 - Cited by 20 - Related articles Abstract: Significant energy saving is achievable by adapting the number of operating wavelengths to the varying traffic in a reconfigurable WDM-PON deploying ... Delay fairness in reconfigurable and energy efficient TWDM PON ... https://www.semanticscholar.org/...reconfigurable-and-energy.../0ed0cc38978115d0121... Semantic Scholar extracted view of "Delay fairness in reconfigurable and energy efficient TWDM PON" by Luca Valcarenghi et al.
