Abstract Ad-hoc networking is a concept in computer communications, which means that users wanting to communicate with each other form a temporary network, without any form of centralized administration. Each node participating in the network acts both as host and a router and must therefore be willing to forward packets for other nodes.In a multi-hop wireless packet network, a packet traverses more than one wireless link in traveling from its source to its destination. Such wireless networks have received considerable attention recently in the context of ad hoc networks. Ad-Hoc networks are self-organizing multi-hop wireless networks where not all links along the path of a packet can be activated simultaneously. Hence the performance of a higher level mechanism, such as congestion window or Transport Layer protocol (TCP) will depend crucially on how the links are scheduled for transmission. In multiple access networks, such as the IEEE802.11 wireless LAN, the scheduling of transmissions is done by the medium access control (MAC) protocol. This transmission scheduling is completely unaware of the needs of the TCP congestion window protocol. This thesis is concerned with the poor interaction between the TCP adaptive window protocol, the IEEE 802.11 MAC protocol, and the IEEE 802.11 Ad-Hoc routing protocol. Our thesis follow on the work done by the researchers K. Nahm and C. Kuo in the paper entitled “TCP over 802.11 Multihop networks issues and Performance Enhancement” [1]. Our contributions are two-fold. First we have repeated and confirmed the simulation results reported by K.Nahm and C.Kuo using NS-2 network simulator. Second we have introduced a simple modification in the 802.11 DSR routing protocol which reduces the unnecessary VI reroutings triggered by MAC packet collisions and enforces the TCP to enter the fast retransmit / fast recovery phase to quickly recover the packet loses. This modification has been simulated using NS-2 network simulator and from the results we have found that it provides a substantial improvement in TCP performance in the situations that we have considered in the simulation models
يحي الشارف المبروك (2009)

The introduction of new services with different bandwidth requirements, e.g., data and multimedia, to cellular mobile radio networks makes many of the traditional mechanisms unusable or less efficient. The call admission control and the handover handling are the most sensitive issues to this extension. The performance of all services including the traditional voice and the new services can be dramatically effected if no appropriate schemes are used. In this research work, a new call admission and handover handling schemes for a cellular mobile network that offers two service types: voice and data is proposed. The data connections are assumed to be transmitted at different data rates, which are an integer multiple to that of one traffic channels, which are full speed(Cd1) & reduced peed(Cd2). In order to reduce the handover failure probability of data connections, the data mobile terminals (MT) are assumed to have the capability of transmitting at two different data rates. If the handover request can not be satisfied by the base station of the destination cell due to unavailable free traffic channels, the data mobile terminals tries with a lower data rate. The handover fails if the network is incapable on providing the minimum data rate at which the mobile terminal can transmit. The reduced data connection or data rate can be speeded up to full data rate or full speed as soon as enough bandwidth is available. The effect of different traffic and configuration parameters on the performance of the different models for two cell model with equal input traffic intensity, two cell model with different input traffic intensity, and two cell model with equal input traffic intensity considering the congestion rate for the highway model are studied as the models of this research. These models are built using MOSEL language (Modeling Specification and Evaluation Language). The results of investigating the mentioned models showed the effect of the handover, and speed of data on these different models.
W. ABUGHRES(1-2000)

تعطي هذه الاطروحة خلفية عن أجهزة الموبيل , الشبكات الاسلكية, تطبيقات الشبكات الاسلكية والانترنت موبايل كما أعطت خلفية عن تطيبقات البرتوكولات اللاسلكية والبنية التحتية للوب وذلك لتحديث تطيبقات الموبايل باستخدام لغة HTML واللغات الجديدة مثل WML و XML الناطقة. ولقد افترضت الاطروحة ان هناك معرفة مسبقة بلغات تصميم صفحات الويب وهي HTML و XHTML وتطرقت الى بعض المبادئ للغة JSP.إن المعضلة هذه الايام تكمن في كيفية التحادث بين اللغات المختلفة للانترنت وايصالها الى الاجهزة المتنوعة مثل PC Browser – PDA – أو أجهزة النقال المختلفة ، وتعزى هذه المشكلة الى وجود اختلافات في قدرة الاجهزة من حيث حجم الشاشة وقدرة استقبالها للوسائط المتعددة (الصوت والصورة والفلاش).ولحل هذه المشكلة سوف نقوم باستخدام قاعدة بيانات تحتوى جميع قدرات الاجهزة المعلوماتية وسوف يتم ذلك عن طريق استخدام (Mobile Aware Software) وهو قاعدة بيانات شاملة تحتوى على اكثر من 500 جهاز بأقسامه ، وقد تم تنفيذ هذه الطريق بتصميم صفحة أنترنت للكمبيوتر وإدخال بعض الاضافات وبعض الخطوات البسيطة لاتاحة نقل هذه الصفحة وعرضها في الاجهزة النقالة المختلفة.وتم اثبات وتحقيق هذا الحل عن طريق استخدام موقع لقسم الهندسة الكهربائية والالكترونية والذى تم تحويله الى اجهزة مختلفة ولاحظنا الاختلافات التى طرأت على الموقع ، وبهذه الطريقة نستطيع الان نقل أي موقع الى اي جهاز أخر في دقائق معدودة بدون اللجوء الى لغات معقدة او ملفات كبيرة. Abstract This thesis provides some background on mobile devices, wireless networks, mobile internet and wireless application networks and some back ground about wireless application protocol, web infrastructure for mobile application development using HTML, and newer markup language such as wireless markup language (WML) and Voice XML.It assumes that the web page designs using HTML and XHTML are already know. It also provides some background on basic JSP.The Conversion between Internet languages and delivering them to multiple devices is problem now days, for example PC browser, PDA and Mobile Phone Devices. This is due to differences in device capability and requirements including Markup language and screen size and media capabilities ((images flash, audio)).To solve the problem we will use data store which is contain all device capability information’s ,by using the Mobile Aware software to provides a comprehensive device database containing more than 500 devices and device classes, and it’s done by design a normal webpage for PC Browser and inserting some tag and adding a few simple steps to provides the possibility of transfer the web site internet to multi devices such as PDA, Mobile devices. It was demonstrated by using real web site for Electrical & Electronic department which is transferred to different devices, and we have noted changes that took place for the web site, and now we are able to transfer any web site to any device in few minutes without having to know a complicated language or large files.
ميسون عمر كريم (2006)