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Register a new userEnhancing the Quality of Service for Real Time and non-Real Time Application via Internet Network
تحسين جودة الخدمة لتطبيقات الزمن الحقيقي و غير الحقيقي عبر شبكة الانترنت
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محمد حجازية( باحث )
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تُصنف الخدمات التي يطلبها المستخدمون عبر شبكة الانترنت إلى نوعين أساسيين، خدمات تعمل بالزمن الحقيقي مثل تطبيقات الفيديو و الصوت بالزمن الحقيقي و هي تستخدم بروتوكول (UDP (Unit Datagram Protocol، و خدمات أخرى تعمل بالزمن غير الحقيقي مثل تطبيقات تصفح الويب (HTTP (Hiyber Text Transfer Protocol و نقل الملفات FTP) File Transfer Protocol) و تستخدم بروتوكول TCP( Transmission Control Protocol). يتم في هذا البحث دراسة و تحليل الخوارزميات التي تحسن جودة الخدمة لمختلف هذه التطبيقات، فمن أجل تطبيقات الزمن الحقيقي يتم استخدام قواعد الرتل التي تعطي أفضلية لهذه الخدمات و تحقق أقل تأخير زمني، أما من أجل تطبيقات الزمني غير الحقيقي فيتم دراسة خوارزميات التحكم بالازدحام التي تحقق أفضل أداء لعملية النقل الموثوق بوجود الازدحام عبر شبكة الانترنت. تم استخدام برنامج المحاكاة Opnet 14.5 لمحاكاة الخدمات المختلفة عبر شبكة الانترنت، و تبين نتائج الدراسة الحصول على أقل تأخير زمني لخدمة الصوت، و تحقيق معدل إرسال عالي لتطبيق FTP بوجود ضياع للرزم في الشبكة.
Services that demanded by users via internet network are classified in two main kinds, Services work in real time such as video and voice in real time and use UDP protocol, and other services that work in non-real time such as web browsing (HTTP) and file transfer (FTP) which use TCP Protocol. In this research, we study and analyze algorithms that enhance the quality of service for various applications. For real time application, we use queues disciplines, which gives high priority for these services and achieves minimum delay. For non-real time application, we study congestion control algorithms, which achieve best performance for reliable transfer process with existing the congestion in the network. We used OPNET 14.5 program for simulating various services via internet network. Simulation results show achieving minimum delay for voice service, and achieving high transmission rate for FTP application with existing of packets loss in the network.
References used
CAVENDISH, D. GERLA,M. AND MASCOLO,S. “A control theoretical approach to congestion control in packet networks,” IEEE/ACM Trans .Network., vol. 12, no. 5, pp. 893–906, Oct. 2004
(AZUMA, T. AND FUJITA :M. ``Congestion Controlin Computer Networks'' , Journal of The Society of Instrument and Control Engineers, Vol. 41, No. 7, pp. 496--501 (2002--7
PETERSON, L.L. ; DAVIE, B.S. “computer networks”, fourth edition, Elsevier, USA, 2007,pp. 461-475
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