ارائه راهکاری برای افزایش نرخ ارسال ترافیک اینترنت روی شبکه‌های نوری OPS
محورهای موضوعی : مهندسی برق و کامپیوتر
اکبر غفارپور رهبر
1
(دانشگاه صنعتی سهند)
کلید واژه: اینترنت روی شبکه‌های نوریشبکه‌های نوری زمان‌بندی‌شده OPS بدون بافر نوریبهره‌وری اینترنت,
چکیده مقاله :
شبکه زمان‌بندی‌شده تمام نوری سوئیچینگ پاکت را در نظر بگیرید که در آن پروتکل ارتباطی اینترنت در لایه‌های بالاتر به‌کار گرفته شده است. این نوع شبکه با معضل برخورد پاکت‌ها و در نتیجه حذف پاکت‌ها مواجه است. لذا ارسال دوباره ترافیک حذف‌شده به شبکه در لایه نوری می‌تواند باعث افزایش بهره‌وری اینترنت و حتی کاهش هزینه طراحی شبکه‌های (OPS) گردد. در این روش یک کپی از ترافیک ارسال‌شده به شبکه (به‌صورت پاکت نوری) در حافظه الکترونیکی سوئیچ مرزی نگه داشته می‌شود و هر وقت که پاکت نوری ارسالی در شبکه حذف شود، پاکت نوری جدیدی از این کپی درست شده و مجدداً به شبکه ارسال می‌گردد (ارسال دوباره در لایه نوری و مستقل از لایهTCP ). به‌عبارت بهتر علاوه بر لایه (بالاتر)TCP که عمل ارسال دوباره پاکت‌های IP را انجام می‌دهد، لایه (پایین‌تر) نوری هم عمل ارسال دوباره پاکت‌های نوری را انجام می‌دهد. در این مقاله، علاوه بر ارائه روشی برای پیاده‌سازی ارزان‌تر شبکه OPS ، میزان بهره‌وری اینترنت در شبکه زمان‌بندی‌شده OPS بررسی شده و روشی برای افزایش میزان بهره‌وری اینترنت و همچنین بهبود توزیع بهره‌وری بین گره‌های دورتر از هم ارائه می‌گردد.
Consider an all-optical time-slotted OPS network in which Internet protocol has been used at upper layers. Contention is a major problem for such a network. It is shown in this paper that optical packet retransmission at the optical domain can improve Internet throughput and can even reduce cost of OPS network implementation. In this technique, a copy of transmitted optical packets are saved in ingress switches and retransmitted when required, independent of TCP layer retransmission. In other words, retransmission may happen both at the optical layer and at the TCP layer. In this paper, an approach is proposed to reduce cost of OPS network implementation. In addition, Internet throughput is studied in slotted OPS network and an approach is proposed to increase Internet throughput and to improve throughput of long-hop connections.
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