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Wireless Networks- Open Courses by Atlantic International University - AIU Courses Content Wireless Networks Education is a Human Right Wireless Networks Wireless Networks The following course Wireless Networks is provided in its entirety by ' which strives to make knowledge and education readily available to those seeking advancement regardless of their socio-economic situation, location or other previously limiting factors. The University's are free and do not require any purchase or registration, they are open to the public. The course in Wireless Networks contains the following:. Lessons in video format with explaination of theoratical content. Complementary activities that will make research more about the topic, as well as put into practice what you studied in the lesson. These activities are not part of their final evaluation. Texts supporting explained in the video.

The Administrative Staff may be part of a degree program paying up to three college credits. The lessons of the course can be taken on line Through distance learning.

The content and access are open to the public according to the 'Open Access' and ' Open Access ' Atlantic International University initiative. Participants who wish to receive credit and / or term certificate, must register as students.

Lesson 1: Overview of Computer Networks and Wireless Networks A wireless network is any type of computer network that uses wireless data connections for connecting network nodes. Wireless networking is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations.1 Wireless telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure. Lesson 2: Cellular Concepts and Designs Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor. The most common wireless technologies use radio. With radio waves distances can be short, such as a few meters for television or as far as thousands or even millions of kilometers for deep-space radio communications.

It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mice,keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Lesson 3: Getting to Know Wireless Networks and Technology Wireless networks have been an essential part of communication in the last century. Early adopters of wireless technology primarily have been the military, emergency services, and law enforcement organizations. Scenes from World War II movies, for example, show soldiers equipped with wireless communication equipment being carried in backpacks and vehicles. As society moves toward information centricity, the need to have information accessible at any time and anywhere (as well as being reachable anywhere) takes on a new dimension. With the rapid growth of mobile telephony and networks, the vision of a mobile information society (introduced by Nokia) is slowly becoming a reality.

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Lesson 4: Physical Layer Fundamentals'LAN - Local Area Network A LAN connects network devices over a relatively short distance. A networked office building, school, or home usually contains a single LAN, though sometimes one building will contain a few small LANs (perhaps one per room), and occasionally a LAN will span a group of nearby buildings. In TCP/IP networking, a LAN is often but not always implemented as a single IP subnet. In addition to operating in a limited space, LANs are also typically owned, controlled, and managed by a single person or organization.

They also tend to use certain connectivity technologies, primarily Ethernet and Token Ring. Lesson 5: Network Topology/Case study The term topology, or more specifically, network topology, refers to the arrangement or physi Network Topology cal layout of computers, cables, and other components on the network. 'Topology' is the standard term that most network professionals use when they refer to the network's basic design. In addition to the term 'topology,' you will find several other terms that are used to define a network's design:  Physical layout  Design  Diagram  Map Lesson 6: Cellular Systems Medium Access Control (MAC Cellular systems are widely used today and cellular technology needs to offer very efficient use of the available frequency spectrum. With billions of mobile phones in use around the globe today, it is necessary to re-use the available frequencies many times over without mutual interference of one cell phone to another.

It is this concept of frequency re-use that is at the very heart of cellular technology. However the infrastructure technology needed to support it is not simple, and it required a significant investment to bring the first cellular networks on line. Lesson 7: Radio resource management (RRM) Medium Access Control (MAC) RRM concerns multi-user and multi-cell network capacity issues, rather than the point-to-point channel capacity. Traditional telecommunications research and education often dwell upon channel coding and source coding with a single user in mind, although it may not be possible to achieve the maximum channel capacity when several users and adjacent base stations share the same frequency channel. Efficient dynamic RRM schemes may increase the system spectral efficiency by an order of magnitude, which often is considerably more than what is possible by introducing advanced channel coding and source coding schemes. RRM is especially important in systems limited by co-channel interference rather than by noise, for example cellular systems and broadcast networks homogeneously covering large areas, and wireless networks consisting of many adjacentaccess points that may reuse the same channel frequencies.

Lesson 8: Mobility management A GSM or UMTS network, like all cellular networks, is basically a radio network of individual cells, known as base stations. Each base station covers a small geographical area which is part of a uniquely identified location area.

By integrating the coverage of each of these base stations, a cellular network provides a radio coverage over a much wider area. A group of base stations is named a location area, or a routing area. The location update procedure allows a mobile device to inform the cellular network, whenever it moves from one location area to the next. Mobiles are responsible for detecting location area codes. When a mobile finds that the location area code is different from its last update, it performs another update by sending to the network, a location update request, together with its previous location, and its Temporary Mobile Subscriber Identity (TMSI). Lesson 9: Wireless Networking: Getting Started Most wireless networks are based on the IEEE® 802.11 standards. A basic wireless network consists of multiple stations communicating with radios that broadcast in either the 2.4GHz or 5GHz band, though this varies according to the locale and is also changing to enable communication in the 2.3GHz and 4.9GHz ranges.

802.11 networks are organized in two ways. In infrastructure mode, one station acts as a master with all the other stations associating to it, the network is known as a BSS, and the master station is termed an access point (AP). In a BSS, all communication passes through the AP; even when one station wants to communicate with another wireless station, messages must go through the AP. In the second form of network, there is no master and stations communicate directly. This form of network is termed an IBSS and is commonly known as an ad-hoc network.

Lesson 10: Introduction to Mobile IP Mobile IP is an open standard, defined by the Internet Engineering Task Force (IETF) RFC 2002, that allows users to keep the same IP address, stay connected, and maintain ongoing applications while roaming between IP networks. Mobile IP is scalable for the Internet because it is based on IP—any media that can support IP can support Mobile IP. The number of wireless devices for voice or data is projected to surpass the number of fixed devices. Mobile data communication will likely emerge as the technology supporting most communication including voice and video. Mobile data communication will be pervasive in cellular systems such as 3G and in wireless LAN such as 802.11, and will extend into satellite communication. Though mobility may be enabled by link-layer technologies, data crossing networks or different link layers is still a problem. The solution to this problem is a standards-based protocol, Mobile IP.

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