Mobile network traffic modelling

Çakmak, Yadigar
The aim of this thesis is to investigate the traffic patterns in the mobile data networks. In this work, a simple Cellular Digital Packet Data (CDPD) network was modeled in order to be used in simulations. For the purpose of using in the CDPD model, a synthetic bursty traffic model was produced and using different traffic patterns some performance investigations were made in CDPD network. During the whole work, OPNET simulation tool was used. The CDPD network modeled by OPNET simulation tool was compared with a CDPD model described in the literature and the differences were shown. The new model has some new features: 1) Burst transmission of MAC blocks. 2) Exponential backoff. 3) New packet structures. 4) Frame segmentation and encapsulation into MAC layer frames. Using OPNET, a traffic having higher level of burstiness was produced and applied to the CDPD network model. Under the bursty traffic, some CDPD performance parameters were collected and according to the collected results some suggestions were given.


Robot planing based on learned affordances
Çakmak, Maya; Şahin, Erol; Department of Computer Engineering (2007)
This thesis studies how an autonomous robot can learn affordances from its interactions with the environment and use these affordances in planning. It is based on a new formalization of the concept which proposes that affordances are relations that pertain to the interactions of an agent with its environment. The robot interacts with environments containing different objects by executing its atomic actions and learns the different effects it can create, as well as the invariants of the environments that aff...
Software process improvement based on static process evaluation
Seçkin, Haldun; Bilgen, Semih; Department of Electrical and Electronics Engineering (2006)
This study investigates software development process improvement approaches. In particular, the static process evaluation methodology proposed by S. Güceğlioğlu is applied on the requirements analysis and validation process applied in Project X in MYCOMPANY and an improved process is proposed. That methodology is an extension of the ISO/IEC 9126 approach for software quality assessment, and is based on evaluating a set of well-defined metrics on the static model of software development processes. The improv...
Design and implementation of a software development process measurement system
Eralp, Özgür; Bilgen, Semih; Department of Electrical and Electronics Engineering (2004)
This thesis study presents a software measurement program. The literature on software measurement is reviewed. Conditions for an effective implementation are investigated. A specific measurement system is designed and implemented in ASELSAN, Inc. This has involved organizational as well as technical work. A software tool has been developed to assist in aggregating measurements obtained from various CASE tools in use. Results of the implementation have started to be achieved. Lots of useful feedbacks have be...
Efficient scheduling in distributed computing on grid
Kaya, Özgür; Bozyiğit, Müslim; Department of Computer Engineering (2006)
Today many computing resources distributed geographically are idle much of time. The aim of the grid computing is collecting these resources into a single system. It helps to solve problems that are too complex for a single PC. Scheduling plays a critical role in the efficient and effective management of resources to achieve high performance on grid computing environment. Due to the heterogeneity and highly dynamic nature of grid, developing scheduling algorithms for grid computing involves some challenges....
The effects of hierarchy on mobile wireless sensor network coverage
Aslan, Ali Umut; Solak, Ercan; Department of Information Systems (2006)
Due to their economic potential and widespread application areas, wireless sensor networks have emerged as an active research topic during the last five years. One of the fundamental challenges in wireless sensor network research is the provision of sufficient coverage while maintaining energy efficiency and longevity under sensor mobility. The purpose of this thesis is to observe the coverage and energy consumption dynamics of a mobile wireless sensor network in a hierarchical architecture. To achieve this...
Citation Formats
Y. Çakmak, “Mobile network traffic modelling,” M.S. - Master of Science, Middle East Technical University, 2004.