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Study the effect of congestion control in improving the performance of computer networks algorithms

دراسة تأثير خوارزميات التحكم بالازدحام في تحسين أداء الشبكات الحاسوبية

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 Publication date 2017
and research's language is العربية
 Created by Shamra Editor




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Computer networks have evolved considerably in the past few years of big increases in mutual amounts of data across the network hand because of the increasing number of interconnected devices, which can exchange data as part of the network and this is what led to the emergence of what is known as the problems of congestion Studies showed about some of these problems that the largest reason is involved in the implementation of the transmission rules, and this led to the urgent of multiple types of protocols in the computer networks that needs to deal with different computer and communication systems, and many other applications, which often causes errors at the level of the bit and level of the packets, missing packets, duplicate packets, randomly received packets, and most importantly the appeared congestion in the network. This research aims to determine how to improve the performance of the network to get rid of the congestion by using advantages of the algorithms used to avoid congestion that may occur in the networks that rely TCP protocol . The goals of these algorithms is to reach stability in the network by working to achieve the principle of package saving. Also within this scope it has been studied, and compared some of the algorithms that used to avoid congestion in general, without relying on a specific protocol or specific service category.


Artificial intelligence review:
Research summary
تناقش هذه الدراسة تأثير خوارزميات التحكم بالازدحام على تحسين أداء الشبكات الحاسوبية، مع التركيز على الشبكات التي تعتمد بروتوكول التحكم بالنقل (TCP). يهدف البحث إلى تحديد كيفية تحسين أداء الشبكة من خلال التخلص من الازدحام باستخدام خوارزميات مختلفة. تم تحليل ومقارنة أداء بعض الخوارزميات المستخدمة في تجنب الازدحام دون الاعتماد على بروتوكول معين أو صنف خدمة محدد. تم استخدام برنامج المحاكاة OPNET لاختبار سيناريوهات مختلفة لتحديد تأثير هذه الخوارزميات على أداء الشبكة. أظهرت النتائج أن تصميم الشبكة على مبدأ (No_Drop) يجعل من حجم النافذة ورقم المقطع يتزايدان بشكل ثابت مما يحقق تكاملية المعلومات. بينما أظهر استخدام أسلوب (Drop no fast) تزايداً ثابتاً وغير كبير في حجم النافذة ورقم المقطع مع تناقص في نافذة الازدحام عند حدوث ازدحام. أما استخدام أسلوب (Drop–fast) وخوارزمية fast retransmit أظهر أن نافذة الازدحام تبدو متقلبة بشكل حدي نوعاً ما، ولكن الرقم المتسلسل للإطار يتزايد بثبات إلى حد كبير.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة جداً في مجال تحسين أداء الشبكات الحاسوبية، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الممكن أن تشمل الدراسة تحليل أعمق لتأثير أنواع أخرى من البروتوكولات غير TCP على أداء الشبكة. ثانياً، كان من الأفضل توسيع نطاق المحاكاة لتشمل فترات زمنية أطول ونسب إهمال رزم مختلفة لتحقيق نتائج أكثر دقة وشمولية. ثالثاً، يمكن أن تكون الدراسة أكثر فائدة إذا تضمنت تحليلاً لتأثير الخوارزميات على أنواع مختلفة من التطبيقات الشبكية، مثل تطبيقات الفيديو والألعاب التي تتطلب عرض حزمة أكبر.
Questions related to the research
  1. ما هو الهدف الرئيسي من هذه الدراسة؟

    الهدف الرئيسي من هذه الدراسة هو تحديد كيفية تحسين أداء الشبكة من خلال التخلص من الازدحام باستخدام خوارزميات مختلفة تعتمد على بروتوكول TCP.

  2. ما هي الأدوات التي تم استخدامها في هذه الدراسة لتحليل أداء الشبكة؟

    تم استخدام برنامج المحاكاة OPNET لتحليل أداء الشبكة واختبار سيناريوهات مختلفة لتحديد تأثير خوارزميات التحكم بالازدحام.

  3. ما هي النتائج الرئيسية التي توصلت إليها الدراسة؟

    أظهرت النتائج أن تصميم الشبكة على مبدأ (No_Drop) يجعل من حجم النافذة ورقم المقطع يتزايدان بشكل ثابت مما يحقق تكاملية المعلومات. بينما أظهر استخدام أسلوب (Drop no fast) تزايداً ثابتاً وغير كبير في حجم النافذة ورقم المقطع مع تناقص في نافذة الازدحام عند حدوث ازدحام. أما استخدام أسلوب (Drop–fast) وخوارزمية fast retransmit أظهر أن نافذة الازدحام تبدو متقلبة بشكل حدي نوعاً ما، ولكن الرقم المتسلسل للإطار يتزايد بثبات إلى حد كبير.

  4. ما هي التوصيات التي قدمتها الدراسة لتحسين أداء الشبكات الحاسوبية؟

    أوصت الدراسة بإجراء المحاكاة للسيناريوهات المختلفة المدروسة في حالات مختلفة مع نسب إهمال رزم مختلفة وعلى فترات زمنية أكبر للمحاكاة بما يساعد في تحقيق وتحديد النقاط الأمثل لتصميم شبكات ذات أداء أفضل.


References used
SALLY FLOYD. TCP and Explicit Congestion Notification, ACM Computer Communications Review, October 1994, p. 10-23
HARRIS INTERACTIVE. P.C. and Internet Use Continue to Grow at Record Pace. Press Release, February 7, 2010
FLOYD S.; HENDERSON, T.. The New Reno Modification to TCP’s Fast Recovery Mechanism, April 1999, RFC 2582
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