07.05.2014

What is 4g wimax speed

While most of us are used to getting high speed Internet connections at home, the office or even the local coffee shop, once we are on the road those high speeds have to stay behind. But first, some background: 4G is the short name for fourth-generation wireless, the stage of mobile communications that will enable things like IP-based voice, data, gaming services and high quality streamed multimedia on portable devices with cable modem-like transmission speeds.
Think of wireless generations as a handful of services that get faster and more feature-rich as newer technology becomes available.
There are a number of standards and technologies pertaining to each wireless generation -- GSM, cdmaOne, GPRS, EDGE, CDMA2000, UMTS (also marketed as 3GSM), HSDPA, among others. Although no set of standards have been established as of yet by the International Telecommunication Union (ITU), the authority on such things, two competing technologies have been proposed: LTE and WiMAX.
Besides speed, several other guidelines have been traced for wireless communication standards to qualify as 4G.
Short for Long-Term Evolution, LTE is considered by many to be the natural successor to current-generation 3G technologies, in part because it updates UMTS networks to provide significantly faster data rates for both uploading and downloading. LTE is being developed by a group of telecommunications associations known as the 3rd Generation Partnership Project, or 3GPP, as an eight release of what has been evolving since 1992 from the GSM family of standards. The reason behind LTE?s strong industry support lies in the relative ease of upgrading from current 3G networks worldwide over to LTE mobile broadband, compared to the significant infrastructure build out that WiMAX has taken thus far.
WiMAX is a wireless broadband access standard developed and maintained by the IEEE under the 802.16 designation. Again, "theoretical" is the keyword here as WiMAX, like all wireless technologies, can either operate at higher bitrates or over longer distances but not both. In terms of total available 4G spectrum to deploy their services, Clearwire has several times more than its competitors, which have smaller portions of the 700 MHz band. Furthermore, as mentioned earlier, the 700 MHz band that both Verizon and AT&T plan to use has enormously better range and penetration of buildings than the same power of signal at 2.5 GHz. As you might have guessed, the industry players behind these 4G technologies reflect the history of each standard. LTE has been defined to accommodate paired spectrum FDD and unpaired spectrum TDD operations. Kacific Broadband Satellites Pte Ltd plans to provide satellite coverage to the majority of the Pacific island nations, including Tokelau.


AgCom potrebbe prorogare i termini di 24 mesi per le due aziende che piu hanno investito nel WiMax.
Quando venne proposto, il WiMax sembrava la panacea a tutti i problemi di Digital divide rilevati nelle zone non ancora raggiunte dalla banda larga, ma poi gli operatori mobili hanno preferito sposare Lte. ITespresso e il sito di tecnologia dedicato a tutti coloro che sono appassionati dei trend del mercato IT, non solo di nuovi prodotti (smartphone, tablet, app innovative…) ma anche dei fenomeni che stanno cambiando il modo di lavorare: virtualizzazione, collaboration, cloud, byod.
It's a successor to 2G and 3G wireless, whereby the first signified the shift from analog to digital transmissions, bringing data services like SMS and email to mobile phones for the first time, and the second refers to the advent of things like global roaming as well as higher data rates. For practical reasons, we won't be dwelling on the technicalities of each term and instead will move onto the ones that involve our topic of interest here: 4G. Many service providers often use the term 4G mobile broadband to describe the technologies they are offering based on their own, sometimes distorted definitions. In a nutshell, they should be very spectrally efficient, should dynamically share and utilize the network resources to support more simultaneous users per cell, have smooth handovers across heterogeneous networks, offer high quality of service for next generation multimedia support, and should be based on an all-IP packet switched network. The first is that the technology finally leaves behind the circuit switched network of its GSM roots and moves to an all-IP flat networking architecture.
Fewer cell sites have to be built and penetration into buildings is better at the 700 MHz spectrum LTE uses. As its name suggest, WiMAX can be thought of as an extension of Wi-Fi designed to enable pervasive, high-speed mobile Internet access on a wide range of devices, from laptops to smartphones. Some experts have said that 700MHz will require as few as one-quarter as many base stations to offer identical coverage to 2.5 GHz. Whereas LTE biggest supporters are, in general, telecommunication service companies and handset manufacturers, WiMAX counts the likes of Intel, Cisco and Google among its most important backers. Aria e Retelit sono i due player che si erano aggiudicati le licenze per le frequenze della banda larga mobile nella famosa Asta WiMax e non hanno ottemperato agli obblighi di copertura minima. Riporta Alessandro Longo che Retelit ha deciso di affittare a Linkem (ex Megabeam) il suo ramo Wimax. Attento alle innovazioni apportate dal mondo social, ITespresso guarda con interesse le dinamiche dei social network, da Facebook a Google, dando consigli e strumento concreti anche alle piccole e media imprese per utilizzare l’IT a vantaggio del business. In this piece we are going to tell you all about the technology and its benefits, who offers it or plans to, how much it costs, and the gear you need to enjoy the next generation of wireless broadband today.


With 4G you'll be able to do the same but at much faster rates, while the extra bandwidth opens the door for newer applications. This is a significant shift which in very simple terms means that LTE will treat everything it transmits, even voice, as data. AT&T and T-Mobile claim they will begin to deploy LTE in 2011, but in the meantime both networks have moved to HSPA 7.2 and the latter plans to roll out HSPA+ beginning this year.
However, WiMAX deployments are already up and running while LTE's formal debut is still a few months out.
The current implementation is based on the 802.16e specification which offers theoretical downlink rates upwards of 70Mbps and up to 30-mile ranges. Like LTE -- and Wi-Fi 802.11n for that matter -- WiMAX supports MIMO technology, which means that additional antennas can increase the potential throughput. It should be noted though that many companies like Nokia or Motorola are members of both industry groups, with different levels of involvement. Limkem, che per le licenze aveva speso 34 milioni di euro e conta 500 antenne e circa 30mila abbonati, ottiene un contratto di 12 anni con un canone di 5,5 milioni di euro nei primi tre anni e, in quelli successivi, di 2,3 milioni di euro all’anno.
The other big change relates to the use of MIMO technology, or multiple antennas at both the transmitter and receiver end to improve communication performance.
Theoretically these can support speeds of up to 7.2 and 21 Mbps, respectively, but in real world scenarios they are only marginally faster than most 3G data services. This setup can either be used to increase the throughput data rates or to reduce interference.
Linkem, che ha affittato il ramo di tecnologia wireless della Retelit, rimpiazza Aria nell’accordo strategico con Telecom Italia. Mentre gli Usa avanzano sul 4G (e sono gia pronti gli smartphone e in cantiere i tablet 4G, come Blackberry Playbook), forse qualcosa si muove in Italia per evitare lo stallo degli ultimi mesi. In fondo l’asta Lte dovrebbe fruttare 2,4 miliardi di euro, una cifra non trascurabile.



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