QoS provisioning in 3G WCDMA networks

مقدم أطروحة جامعية

Mihdi, Sebbane

مشرف أطروحة جامعية

Rashidi, Taj al-Din

الجامعة

جامعة الأخوين

الكلية

كلية العلوم و الهندسة

دولة الجامعة

المغرب

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2004

الملخص الإنجليزي

In the last few years, new generation of Wireless Networks, such as the Universal Mobile Telecommunication Network (UMTS), emerged aiming to revolutionize the actual wireless communication paradigm by developing a Network able to a wide range of heterogeneous users with different Quality of Service (QoS) profiles and where user mobility is supported.

This kind of wireless networks came also because of the need for multimedia services that require guaranteed quality of service - such as bit rate, delay and bit error rate (BER).

The main advantage of networks such as UMTS radio interface is their flexibility in resource management allowed by the WCDMA (Wideband Code Division Multiple Access) access technique.

However, to be able to exploit this flexibility optimally it is necessary to: 1.

Have an efficient Call Admission Control (CAC) scheme able to cope with the inherent link degradation due to the interference limited nature of the WCDMA, 2.

have good Radio Resource Management (power control algorithms), 3.

Apply good SHO processing algorithms, and 4.

A Scheduler working close to real-time.

An efficient CAC can not be the whole solution.

Indeed, Radio Resource Management, User mobility information and prediction algorithms are also of major concern in the WCDMA networks.

Power control is very essential in WCDMA to combat fading and interferences.

When misused, the use of power control can lead to a high level of wasted power and worse performances results.

Furthermore, SHO handling algorithms must be well-parameterized to avoid unnecessary reservation and/or handoff requests.

In this work, we seeks to extend the work done in [1] and develop an integrated system where WCDMA wireless link characteristics, user mobility and user QoS requirements are reconciled in order to maximize wireless resource utilization, maintain QoS contracts and minimize forced terminations.

In particular, our work aims at demonstrating that taking into account the QoS-profile in the 3 first components listed above (QoS-profile aware Call Admission Control QoS-profile driven power control, and QoS differentiated SHO handling), in an integrated system across a cluster of NodeBs can yield better performance.

A key QoS parameter used in this work is the Service Degradation Descriptor (SDD).

Within such integrated framework, three QoS adaptation approaches (namely the Fair_DQAA, the Unfair_DQAA, and the Basic Algorithm (BA)) are proposed and contrasted using a simulation Testbed.

The design pattern and assumptions underlying the Simulation Testbed are clearly stated in this report.

The results of the evaluation of the proposed QoS approaches are presented in details and conclusions are drawn, accordingly

التخصصات الرئيسية

تكنولوجيا المعلومات وعلم الحاسوب

عدد الصفحات

57

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-647476