Simulation the software environment of IP-based mobile access

مقدم أطروحة جامعية

Abd al-Hadi, Ahmad

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة الحاسوب

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2006

الملخص الإنجليزي

The work presented in this thesis deals with three important issues, t which can be integrated to enhance the operation of the mobile in the IP-based networks.

These are quality of service (QoS) technique, compression schemes and transport technique.

The quality of service (QoS) is the collective effect of service performance, which determines the degree of satisfaction of a user of the service.

The QoS in this thesis uses the weighted fair queuing (WFQ) mechanism that can differentiate between the traffics according to their Type of Service (ToS) associate with each traffic.

Weighted fair queuing uses a complementary technique called weighted random early detection (WRED), which has the ability to recognize and act upon congestion on the output direction of an interface so as to reduce or minimize the effect of that congestion by dropping packet randomly.

WRED takes into account the ToS by increasing the dropping probability of low priority traffic.

The output result depends on some statistics that describe the behavior of the network such as end-to-end delay, delay variation, throughput and response time.

The compression schemes used are packet, data and TCP / IP header compressions.

Each scheme can be used with appropriate traffic where the header compression is used with light traffic ; packet compression is used with medium traffic while data compression is used with heavy traffic.

The transport technique is depending on the TCP protocol to transfer some traffic such as http and e-mail.

There are some parameters that used to improve the performance of the network.

These parameters are maximum segment size, receive buffer and receive buffer adjustment.

Computer simulation has been performed to study and verify the above three mechanisms in the performance enhancement using the OPNET simulator.

The results show that with heavy traffic it is worth to adopt QoS.

Furthermore, the simulation also verifies that all the aspects required and designed from the other mechanisms are adopted.

التخصصات الرئيسية

تكنولوجيا المعلومات وعلم الحاسوب

الموضوعات

• برمجيات الحاسوب
• شبكات الحاسوب
• الإذاعة

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305925