Browsing by Author "Muhammad Basit Shahab"
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Item Efficient solution to physical cell identity assignment problem in 3gpp long term evolution(6th Joint IFIP Wireless and Mobile Networking Conference, 2013) Muhammad Basit Shahab; Ayesha IqbalThis paper presents an efficient solution to physical cell identity assignment problem in 3GPP Long Term Evolution (LTE). The technique takes advantage from the concept of graph coloring and is quite efficient in the sense that minimum number of colors/PCIs is utilized in achieving a collision and confusion free Physical Cell Identity allocation throughout the network. The method has been thoroughly explained using an example, and it has been shown how the technique works and accomplishes the required results. This method is also very much helpful in situations in which somehow a conflict of PCIs occurs between two or more cells. Simulations are performed on a large scale network during initial network wise configuration stage, in which all the cells are without any PCIs assigned.Item Forward fly-back voltage balancing circuit for series connected super capacitors using digital control(International Conference on Renewable Energy Research and Applications, 2013) Asif Hussain; Muhammad Basit ShahabSupercapacitor is an electrical energy storage device which offers remarkably high energy density when compared to conventional capacitors and high power density when compared to batteries. While using the supercapacitors for energy storage, the main disadvantage is their limited voltage due to contemporary technology restrictions. Therefore, for higher voltage operation supercapacitors are connected in series to achieve the appropriate voltage level. Because of the difference in the magnitude of capacitance of cells, local over-voltage appears on one or more supercapacitor cells. This over-voltage decreases the lifetime and energy storage efficiency of the associated cell, which can be improved considerably by balancing the voltages across each supercapacitor. This paper presents an active voltage balancing approach using a forward fly-back power converter. In the proposed balancing scheme, cell with the higher voltage is selected to extract the extra energy and then a proportion of this extracted energy is distributed to other supercapacitors via the proposed circuit. The feasibility of the proposed balancing scheme has been verified by computer simulation and experimental results.Item Neural networks based physical cell identity: assignment for self organized 3gpp long term evolution(IEEE, 2012) Muhammad Basit Shahab; Abdul Aziz BhattiThis paper proposes neural networks based graph coloring technique to assign Physical Cell Identities throughout the self organized 3GPP Long Term Evolution Networks. PCIs are allocated such that no two cells in the vicinity of each other or with a common neighbor get the same identity. Efficiency of proposed methodology resides in the fact that minimum number of identities is utilized in the network wise assignment. Simulations are performed on a very large scale network, where initially all the cells are without any PCIs assigned. Results of simulations are demonstrated to analyze the performance of the proposed techniqueItem Smart grid architecture and communication using heterogeneous communication techniques in different tiers((POWERENG), Turkey, Istanbul., 2013) Waqas Tariq Toor; Muhammad Basit Shahab; Muhammad Shoaib; Asif Hussain; Mashood NasirThis paper discusses different communication techniques in different tiers of architecture of smart grid. Communication is what differentiates between conventional and smart grids. Existing communication techniques can be used for the communication among different grids. Each communication technique has some pros and cons. If same communication technology is used for the whole network, it may be advantageous in certain scenario or tier but may not be beneficial in other tiers. This paper presents the idea of using different communication techniques for different tiers. The main objective is to use the advantage of a communication technique in a certain tier without bearing its disadvantage in any other tier. Different topologies of grid connectivity are discussed and communication techniques are also proposed and discussed accordingly. Priority and data rate for the data sent by the grids is also taken care of in proposing these techniques. Since different communication techniques are used at each level, interoperability is an important issue. Different problems are addressed and solution are proposed.Item Smart grid traffic modeling and scheduling using 3gpp lte for efficient communication with reduced ran delays(Telecommunications and Signal Processing (TSP), 2013) Muhammad Basit Shahab; Asif Hussain; Muhammad ShoaibThere has been a dramatic improvisation in communication technologies during the last two decades. This in turn has evolved as a great source of strength to ideas regarding implementation of smart grids. This paper has three basic emphasis areas. At first, it presents a smart grid top to down hierarchy tree based traffic model by considering the different types of information carrying traffic travelling between multiple nodes of a smart grid. This is done by analyzing the multiple functions performed by a smart grid. After that 3GPP LTE is addressed as the most promising communication backbone for smart grid environment. Its performance has been analyzed in terms of high data rates, improved coverage and reduced Scheduling and Transmission delays. In the end, a priority based queuing technique for smart grid traffic is proposed by categorizing the smart grid traffic into different classes with each class representing a different type of information/data. This results in reducing the queuing delays of traffic at end and intermediate nodes. It has been shown through results that the proposed traffic modeling, scheduling and queuing result in reduced Random Access Network (RAN) delays.