A global area network GAN is a network used for supporting mobile across an arbitrary number of wireless LANs, satellite coverage areas, etc.
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The key challenge in mobile communications is handing off user communications from one local coverage area to the next. Space networks are networks used for communication between spacecraft, usually in the vicinity of the Earth. Some examples of usage include cellular phones which are part of everyday wireless networks, allowing easy personal communications.
Another example, Intercontinental network systems, use radio satellites to communicate across the world. Emergency services such as the police utilize wireless networks to communicate effectively as well. Individuals and businesses use wireless networks to send and share data rapidly, whether it be in a small office building or across the world.
In a general sense, wireless networks offer a vast variety of uses by both business and home users. Each wireless technology is defined by a standard that describes unique functions at both the Physical and the Data Link layers of the OSI model. These standards differ in their specified signaling methods, geographic ranges, and frequency usages, among other things.
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Such differences can make certain technologies better suited to home networks and others better suited to network larger organizations. Each standard varies in geographical range, thus making one standard more ideal than the next depending on what it is one is trying to accomplish with a wireless network. The use of this technology also gives room for expansions, such as from 2G to 3G and, 4G and 5G technologies, which stand for the fourth and fifth generation of cell phone mobile communications standards.
As wireless networking has become commonplace, sophistication increases through configuration of network hardware and software, and greater capacity to send and receive larger amounts of data, faster, is achieved. Now the wireless network has been running on LTE, which is a 4G mobile communication standard. Users of an LTE network should have data speeds that are 10x faster than a 3G network.
Space is another characteristic of wireless networking.
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Wireless networks offer many advantages when it comes to difficult-to-wire areas trying to communicate such as across a street or river, a warehouse on the other side of the premises or buildings that are physically separated but operate as one. Space is also created in homes as a result of eliminating clutters of wiring.
For homeowners, wireless technology is an effective option compared to Ethernet for sharing printers, scanners, and high-speed Internet connections. WLANs help save the cost of installation of cable mediums, save time from physical installation, and also creates mobility for devices connected to the network. The telecommunications network at the physical layer also consists of many interconnected wireline network elements NEs.
These NEs can be stand-alone systems or products that are either supplied by a single manufacturer or are assembled by the service provider user or system integrator with parts from several different manufacturers. Wireless NEs are the products and devices used by a wireless carrier to provide support for the backhaul network as well as a mobile switching center MSC.https://cukeherlore.tk
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Reliable wireless service depends on the network elements at the physical layer to be protected against all operational environments and applications see GR, Generic Requirements for Network Elements Used in Wireless Networks — Physical Layer Criteria. What are especially important are the NEs that are located on the cell tower to the base station BS cabinet. The attachment hardware and the positioning of the antenna and associated closures and cables are required to have adequate strength, robustness, corrosion resistance, and resistance against wind, storms, icing, and other weather conditions.
Requirements for individual components, such as hardware, cables, connectors, and closures, shall take into consideration the structure to which they are attached. Compared to wired systems, wireless networks are frequently subject to electromagnetic interference.
This can be caused by other networks or other types of equipment that generate radio waves that are within, or close, to the radio bands used for communication. Interference can degrade the signal or cause the system to fail. Some materials cause absorption of electromagnetic waves, preventing it from reaching the receiver, in other cases, particularly with metallic or conductive materials reflection occurs. This can cause dead zones where no reception is available. In multipath fading two or more different routes taken by the signal, due to reflections, can cause the signal to cancel out at certain locations, and to be stronger in other places upfade.
The hidden node problem occurs in some types of network when a node is visible from a wireless access point AP , but not from other nodes communicating with that AP. This leads to difficulties in media access control collisions. The exposed terminal problem is when a node on one network is unable to send because of co-channel interference from a node that is on a different network.
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The wireless spectrum is a limited resource and shared by all nodes in the range of its transmitters. Bandwidth allocation becomes complex with multiple participating users. Often users are not aware that advertised numbers e. With increasing demand, the capacity crunch is more and more likely to happen. User-in-the-loop UIL may be an alternative solution to ever upgrading to newer technologies for over-provisioning. Shannon's theorem can describe the maximum data rate of any single wireless link, which relates to the bandwidth in hertz and to the noise on the channel.
One can greatly increase channel capacity by using MIMO techniques,    where multiple aerials or multiple frequencies can exploit multiple paths to the receiver to achieve much higher throughput — by a factor of the product of the frequency and aerial diversity at each end. The total network bandwidth depends on how dispersive the medium is more dispersive medium generally has better total bandwidth because it minimises interference , how many frequencies are available, how noisy those frequencies are, how many aerials are used and whether a directional antenna is in use, whether nodes employ power control and so on.
Cellular wireless networks generally have good capacity, due to their use of directional aerials, and their ability to reuse radio channels in non-adjacent cells. Additionally, cells can be made very small using low power transmitters this is used in cities to give network capacity that scales linearly with population density. Wireless access points are also often close to humans, but the drop off in power over distance is fast, following the inverse-square law.
From Wikipedia, the free encyclopedia. Main article: Wireless revolution.
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Main article: cellular network. Main article: Channel capacity in wireless communications. See also: Wireless electronic devices and health. Retrieved 8 February Jayant World Scientific. CRC Press. Cambridge University Press. Archived from the original on 29 October Retrieved 8 July Why would any of us settle for anything less? Foundational Networking offers innovative thinking on how those wishing to build their network can do so through building relationships.
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