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Topic: Cellular network


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GSM

  
  Cellular network - Wikipedia, the free encyclopedia
A cellular network is a radio network made up of a number of radio cells (or just cells) each served by a fixed transmitter, normally known as a (base station).
Cellular networks are inherently asymmetric with a set of fixed main transceivers each serving a cell and a set of distributed (generally, but not always, mobile) transceivers which provide services to the network's users.
The increased capacity in a cellular network, comparing to a network with a single transmitter, comes from the fact that the same radio frequency can be reused in a different area for a completely different transmission.
en.wikipedia.org /wiki/Cellular_network   (2385 words)

  
 Encyclopedia: Cellular network   (Site not responding. Last check: 2007-10-18)
cellular telephone or cellular radio, telecommunications system in which a portable or mobile radio transmitter and receiver, or "telephone," is linked via microwave radio frequencies to base transmitter and receiver stations that connect the user to a conventional telephone network.
Since today's cellular network coverage reaches about 95% of the population (Gareiss, 1995), cellular service is a ubiquitous method of providing wireless service to employees on the move.
Cellular technology extends the bounds of a corporation's existing telecommunications infrastructure by connecting mobile units to the public network operated by the local exchange or long distance carriers.
www.nationmaster.com /encyclopedia/Cellular-network   (433 words)

  
 [No title]   (Site not responding. Last check: 2007-10-18)
Typically, the cellular switching center includes a mobile switching center (MSC), and the control unit is configured to emulate the signaling communications between the MSC and the signaling transfer point in the cellular network.
Preferably, the cellular network switches are configured to communicate, in the absence of the gateways, over connections in a circuit-switched network, and the integrated gateways are configured to emulate circuit-switched communications with the associated cellular network switches.
Apparatus according to claim 36, wherein the cellular network switches are configured to communicate, in the absence of the gateways, over connections in a circuit-switched network, and wherein the gateways are configured to emulate circuit-switched communications with the associated cellular network switches.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/59969.010816&ELEMENT_SET=DECL   (9612 words)

  
 Encyclopedia article: Cellular network   (Site not responding. Last check: 2007-10-18)
A cellular radio network is a radio (A communication system based on broadcasting electromagnetic waves) network made up of a number of radio cells (or just cells) each served by a fixed transmitter, normally known as a base station (additional info and facts about base station).
Cellular networks are inherently asymmetric with a set of fixed main
Another common example of a cellular network are mobile phone (A hand-held mobile radiotelephone for use in an area divided into small sections (cells), each with its own short-range transmitter/receiver) networks.
www.absoluteastronomy.com /encyclopedia/c/ce/cellular_network.htm   (2351 words)

  
 3D CELLULAR NETWORK
Their base station antennas are down-tilted to beam downward cellular signals to cover the ground and meanwhile to avoid frequency interferences.
This is the infrastructure defect of cellular network that is commonly unaware.
Cellular carriers can utilize 3D cell technology to enable their cellular networks to cover airlines in the future.
www.3dcell.net   (1734 words)

  
 Cellular Technology
The main differences between cellular and cordless technologies are the single cell architecture of cordless and the fact that the two systems operate at different frequencies.
Cellular network providers are even buying PCS licenses to increase their "footprint" indicating that a PCS/cellular service is part of cellular providers' strategies (Amin, 1995).
The opportunities in using cellular technology are extending the bound of a corporation's network infrastructure to include mobile users that may be roaming locally, regionally or nationally.
scis.nova.edu /~raciti/cellular.html   (5290 words)

  
 VoIP Mobility in IP/Cellular Network Internetworking
Cellular networks offer seamless mobility support for voice services with high-quality connection at the expense of being built on complex and costly connection-oriented networking infrastructure that lacks the inherent flexibility, robustness, and scalability found in IP networks.
Meanwhile, even if a new gateway type is introduced to perform signaling conversion between IP and cellular networks as shown in the dotted lines in Fig.
Since both cellular networks 1 and 2 support seamless roaming, as mentioned above, connection handoff is taking place transparently in segments (1) and (3) guided by the underlying system in use.
www.comsoc.org /ci1/private/2000/apr/Liao.html   (2719 words)

  
 Designing the cellular network infrastructure
Likewise, if one of the original cells in the network causes a huge amount of interference, it is up to the engineers to persuade management that it is worth building three smaller replacement cells so that interference may be controlled.
In an ideal network with every cell equally loaded and similar radio propagation characteristics, there may be some kind of abrupt degradation as all cells approach their capacity limits at the same time.
For example, there might be a sophisticated model of a CDMA network that considers the radio propagation, traffic density, error correction and the behavior of the coder/decoder (CODEC) to produce a degradation score for a particular traffic level on the network.
rfdesign.com /mag/radio_designing_cellular_network/index.html   (3638 words)

  
 BSI brochure GSM Cellular Network
The public telephone network with its connecting paths is referred to as the landline network.
At the network provider, data on the identity of the user, the serial number of the mobile phone and the identity of the base station over which registration has occurred is logged and stored.
However, there are special technical systems around which exploit the weakness of one-sided authentication in the GSM network (the only authentication which occurs is the authentication of the mobile phone to the base station), by pretending to mobile phones to be a base station, disabling the encryption and instituting plaintext operation.
www.bsi.de /literat/doc/gsm/index_e.htm   (4716 words)

  
 Cellular network-based location system - Patent 5519760   (Site not responding. Last check: 2007-10-18)
In a cellular system configuration, the location of a mobile station is determined from the acquisition of cellular network data pertaining to the mobile station, and the translation of such network data into a corresponding geographical position profile.
The cellular network is further configured with a plurality of mobile switching centers in communication with the base stations and other switching centers to perform processing and switching functions enabling connections between mobile stations and interfacing to external networks such as the PSTN.
Depending upon the type of base station currently serving the cellular phone, the location value may be displayed by AC 31 in different ways, such as with a circle described by the geographic coordinate and the resolution, or a pie-wedge conveying this information and supplemented with the two angle values.
www.freepatentsonline.com /5519760.html   (5767 words)

  
 How A GSM Cellular Network Operates
GSM 900/DCS 1800 networks use a sophisticated array of digital equipment to provide you with a seamless, hiss-free connection.
The request is passed on along the network of BSs to the multifaceted heart of a cellular network - the Mobile Switching Center (MSC).
Once this network "name" message appears on your phone’s LCD screen, it means you’re connected to the network and able to make and receive calls.
www.cellular.co.za /howagsm.htm   (762 words)

  
 EXISTING TECHNOLOGY OF CELLULAR NETWORKS - MOBILE PHONES   (Site not responding. Last check: 2007-10-18)
However this shape is chosen to simplify planning and design of a cellular system as hexagons fit together without any overlap or gap in between them.Another advantage of using hexagons is that it approaches a circular shape which is the ideal power coverage area.
the cellular network has to have the ability to track the subscriber down when a call is made to him/her.
In order for both the cellular system and the mobile phone to have these required knowledge, there are two main procedures to follow when a mobile phone is turned on.
www.doc.ic.ac.uk /~nd/surprise_96/journal/vol1/pr4/article1.html   (1419 words)

  
 Verizon Wireless Best Network in America   (Site not responding. Last check: 2007-10-18)
The company's 'most reliable network' claim is based on network studies performed by real-life test men and test women who inspired the company's national advertising campaign.
After the test vehicles complete their routes, the network teams download the test results onto computers at our network test centers for compilation and analysis.
The network reliability test results have consistently shown that the number of ineffective attempts for the Verizon Wireless national network, in major metropolitan centers and some remote areas, is lower than any other national carrier.
www.verizonwireless.com /b2c/bestNetwork/index.jsp   (269 words)

  
 Multi-Tier Cellular Network Dimensioning - Ekici, Ersoy (ResearchIndex)   (Site not responding. Last check: 2007-10-18)
The majority of the wireless communications networks are cellular networks.
Several methods are developed to increase the performance of the cellular networks, which depends on the correct determination of the design parameters as well as the architecture of the system and the traffic requirements.
Ekici and C. Ersoy; "Multi-Tier Cellular Network Dimensioning"; ACM Wireless Networks, Vol:7 (4), pp.
citeseer.ist.psu.edu /490482.html   (506 words)

  
 Cellular Network Simulation   (Site not responding. Last check: 2007-10-18)
The aim of this project is to create a simple yet powerful cellular network simulator that focuses on the simulation of concepts and comparative performance studies rather than absolute performance studies that are dependent on the underlying system specifics.
The aim is also to create the simulator to be extremely modular, such that swapping of existing components is trivial to the point of not requiring any code modifications, and creation of new components that easily fit into the simulator is a simple and well defined process.
None of these however lends itself easily to the simulation of cellular networks from a high level perspective as opposed to a packet level perspective.
bbcr.uwaterloo.ca /~rboutaba/cellular_network_simulation.htm   (617 words)

  
 Voice & Data Backhaul: Raise Cellular Network Capacity and Service Quality
More and more people worldwide are using cellular telephones as a primary means of communication, even when they are near a land line alternative – which increases cellular usage.
Thus, despite high cellular service saturation, the average usage rate and file size are both on the rise.
Cellular providers are faced with over-subscribed networks and equipment that is expensive to upgrade.
www.proxim.com /solutions/backhaul/raised_service.html   (201 words)

  
 Wiley::Fundamentals of Cellular Network Planning and Optimisation: 2G/2.5G/3G... Evolution to 4G
With the complexity of the cellular networks increasing day by day, a deeper understanding of the design and performance of end-to-end cellular networks is required.
Fundamentals of Cellular Network Planning and Optimisation covers end-to-end network planning and optimisation aspects from second generation GSM to third generation WCDMA networks including GPRS and EDGE networks.
Concentrates on cellular network planning process and explains the underlying principles behind the planning and optimizing of the cellular networks.
www.wiley.com /WileyCDA/WileyTitle/productCd-047086267X.html   (389 words)

  
 Cellular - Wikipedia, the free encyclopedia
For cellular radio networking in general see cellular network
For cellular in the meaning of biology, see Cell (biology).
This is a disambiguation page—a list of articles associated with the same title.
en.wikipedia.org /wiki/Cellular   (115 words)

  
 Joining cellular with WiFi - Americas Network
To top it off, using the phone - still the most preferred means of communication by most users - is hampered by unpredictable cellular coverage, hidden costs and the complication of having multiple phone numbers and voicemail boxes.
Dual-radio (Wi-Fi and Cellular) phones are being designed and IP-PBXs are being enhanced to support roaming across the cellular and Wi-Fi networks.
This means that heavily loaded Wi-Fi networks do not really give voice the priority it needs to provide a high-quality call, under all circumstances.
www.americasnetwork.com /americasnetwork/article/articleDetail.jsp?id=82324   (424 words)

  
 Privateline.com: Digital Wireless Basics: Network Element Structure
The call is processed and routed next to the telephone network at large, also known as the Public Switched Telephone Network.
Though traveling, the cellular network now knows where you are and can direct calls to you.
I'm discussing this to familiarize you with block diagrams; to show network elements don't have to be mysterious.
www.privateline.com /PCS/structure.html   (1041 words)

  
 The High-Speed Cellular-Network Showdown - Wireless Networking -
The problem is that, when talking about the delivery of data over cellular networks, it is not so easy to sort through the maze of technical terms and acronyms.
The two fundamental cellular transmission technologies at work in the U.S. today are known as CDMA (Code Division Multiple Access) and GSM (Global System for Mobile Communication).
Pierce said that cellular subscribers need to understand that the technology is going to be changing every couple of years and that a constant evolution will be underway between now and 2015.
www.wirelessnewsfactor.com /news/The-High-Speed-Cellular-Showdown/story.xhtml?story_id=102003K9RFK0   (1277 words)

  
 Cellular Network Management - 5 stars information about cell phones,mobile phones and accessories
However, the cellular network management problem is so complex that is still...
Design of the Cellular Network Managemet System consisting of Monitoring, Decision Support and Executive subsytem is proposing.
Cellular Asset Management provides a global service for the disposal, Acquisition and auditing of all telecom, cellular, or mobile assets.
www.about-cell-phones.com /Cellular-Network-Management.html   (324 words)

  
 CELLULAR NETWORK SYSTEM   (Site not responding. Last check: 2007-10-18)
V.J.T.I. cellular network allows cellular subscribers to wander anywhere in the country and remain connected to 'Public Switched Telephone Number' (PSTN) via their mobile phones.
The shape is chosen to simplify planning and design of cellular system as hexagons fit together without any overlap.
The cellular network has to have the ability to track the subscriber down when a call is made.
www.ewh.ieee.org /r10/bombay/news2/story2.htm   (416 words)

  
 AT&T - McCaw Cellular Merger   (Site not responding. Last check: 2007-10-18)
McCaw, whose network now spans nearly one-third of the United States, is one of the largest wireless telecommunications companies currently in existence, with four million subscribers and interest in 105 major markets.
Through the use of Cellular Digital Packet Data (CDPD) and AirData, AT&T hopes to start a very profitable venture by providing a cellular data network superior to others offered at this time.
CDPD is the technology used by McCaw's AirData network to transmit data across cellular networks.
fiddle.visc.vt.edu /courses/ee4984/Projects1995/kierschu.html   (1470 words)

  
 = LAN-Cell 1xMG-401 - dual-band CDMA router with cellular modem, 4-port Ethernet switch, VPN and Firewall
Some cellular carriers (such as Verizon Wireless) are now offering unlimited 1x data-only service plans for as little as $79.99 month.
The LAN-Cell's broadband uplink support allows you to standardize on a single remote network access device and transparently connect to cable modem, DSL or Ethernet services when available, while using 1x wireless service when there are no wired network connections present.
Plus, by having separate cellular and Wireless LAN units, you can position each unit and its antenna for the best coverage, performance and least interference.
www.proxicast.com /products/cdma/cdma.htm   (708 words)

  
 Cellular
We now ask for your continued interest and patience as we build our world-class GSM enhanced GPRS cellular network to guarantee island wide coverage, voice and data rich services, and roaming capabilities.
To ensure that we maintain our objective of providing excellent customer service we will not be distributing the free cell phones before the Sunbeach cellular network is fully operational.
With the activation of your free Sunbeach cellular phone you will be signed up for an annual contract for post paid service with a choice from two styles of handsets.
www.sunbeach.net /page.cfm?menuID=3   (417 words)

  
 Cellular Neural Networks
Cellular Neural Networks (CNN) is a massive parallel computing paradigm defined in discrete N-dimensional spaces.
CNN main characteristic is the locality of the connections between the units: in fact the main difference between CNN and other Neural Networks paradigms is the fact that informations are directly exchanged just between neighboring units.
It is possible to consider the CNN paradigm as an evolution of Cellular Automata paradigm.
www.ce.unipr.it /pardis/CNN/cnn.html   (502 words)

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