ذخیره‌سازی انرژی در شبکه‌های منفعل نوری مبتنی بر گیگابیت بر اساس تعیین نقاط اپتیمال به روش کاهش گرادیان
محورهای موضوعی : مهندسی برق و کامپیوترعلی اکبر نیکوکار 1 * , حمیدرضا گودرزی 2 , علی ایلون کشکولی 3
1 - دانشكده علوم پایه، دانشگاه یاسوج
2 - دانشكده علوم پایه، دانشگاه یاسوج
3 - دانشكده علوم پایه، دانشگاه یاسوج
کلید واژه: ذخیره‌سازی انرژی, شبکه منفعل نوری, GPON, کاهش گرادیان, تضمین کیفیت خدمات,
چکیده مقاله :
کاهش مصرف انرژی به وسیله خاموش‌کردن فرستنده/ گیرنده در واحدهای شبکه نوری، رایج‌ترین راه حل ذخیره‌سازی انرژی در شبکه نوری منفعل مبتنی بر گیگابیت می‌باشد. محاسبه مدت زمان خاموشی فرستنده/ گیرنده در واحد نوری، اساسی‌ترین چالش در حوزه ذحیره‌سازی است؛ زیرا کم یا زیادشدن مدت زمان یادشده علاوه بر ذخیره‌سازی انرژی بر کیفیت خدمات نیز تأثیر می‌گذارد. در این مقاله با استفاده از روش کاهش گرادیان که نوعی الگوریتم بهینه‌سازی تکرارشونده است، مکانیسم یافتن نقاط ماکسیمال موضعی مدت زمان خاموشی فرستنده/ گیرنده با درنظرگرفتن سطح کیفی خدمات ارائه شده است. در روش ذکرشده، علاوه بر دقت و سرعت همگرایی، محدودیت افزایش بسیار زیاد حجم داده وجود نخواهد داشت. نوع ترافيك، تاريخچه درخواست هاي پهناي باند، وضعيت صف در واحد نوري و مدت زمان تأخير قابل تحمل در كيفيت خدمات، پارامترهاي ورودي الگوريتم مي باشند. تاریخچه درخواست‌ها و پارامترهای یادشده به عنوان داده‌های آموزش ماشین استفاده شده است. شبیه‌سازی انجام‌شده نشان داد که الگوریتم ارائه‌شده، پارامترهای سطح خدمات شامل تأخیر بسته‌ها، نرخ ازدست‌رفتن بسته‌ها، و توان عملیاتی سیستم را در سطح قابل قبولی حفظ کرده و قادر به ذخیره‌سازی انرژی در واحدهای شبکه نوری تا 17% می‌باشد.
Doze and sleep mechanisms are the most common energy-saving solution in GPON networks. Sleep duration is the critical value in the energy-saving domain, and it will affect the QoS metrics with inappropriate value. In this paper, a new energy-saving mechanism is proposed using an optimal point based on gradient descent that calculates sleep duration and keeps QoS metrics acceptable. The historical value of average delay and packet, drop ratio, ONU buffer, and bandwidth request parameters are used as input, and the sleep duration value is calculated. The simulation results show that the proposed method saves up to 17% energy in GPON and keeps the network’s QoS in an acceptable domain.
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