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Theoretical maximum speeds of 4G LTE reach 100Mbps... However, actual performance of mobile data is much lower, considering signal strength, frequencies used, congestion, etc.

Here are the real-life speed ranges of the various mobile wireless strandards commonly used in the US today:

GSM (Global System for Mobile Communications) 2G -- 9.6KbpsGPRS typically reached speeds of 40Kbps in the downlink and 14Kbps in the uplink by aggregating GSMGPRS (General packet radio services) 2.5G -- 35Kbps to 171kbpsEDGE (Enhanced Data rates for GSM Evolution) 2.75G -- 120Kbps to 384KbpsEDGE Evolution (Improved spectral efficiency with reduced latencies down to 100ms) (Increased throughput speeds to 1.3Mbps in the downlink and 653Kbps in the uplink)UMTS (Universal Mobile Telecommunications System) 3G -- 384Kbps to 2MbpsHSPA (software upgrade to UMTS, theoretical 42Mbps) 3.5G -- 600Kbps to 10Mbps, averages 1-3MbpsWiMAX/LTE "4G" (theoretical 100Mbps) -- 3Mbps to 10Mbps average, 20Mbps+ peak do

wnload speeds.

UMTS HSPA and 3GPP standards

The new high speed technology is part of the 3G UMTS evolution. It provides additional facilities that are added on to t e basic 3GPP UMTS standard. The upgrades and additional facilities were introduced at successive releases of the 3GPP standard.

  Release 4: This release of the 3GPP standard provided for the efficient use of IP, a facility that was required because the original Release 99 focussed o

n circuit switched technology. Accordingly this was a key enabler for 3G HSDPA.  Release 5: This release included the core of HSDPA itself. It provided for downlink packet support, reduced delays, a raw data rate (i.e. including payload, protocols, error correction, etc) of 14 Mbps and gave an overall increase ofaround three over the 3GPP UMTS Release 99 standard.  Release 6: This included the core of HSUPA with an enhanced uplink with improved packet data support. This provided reduced delays, an uplink raw data rate of 5.74 Mbps and it gave an increase capacity of around twice that offered bythe original Release 99 UMTS standard. Also included within this release was the MBMS, Multimedia Broadcast Multicast Services providing improved broadcast services, i.e. Mobile TV.  Release 7: This release of the 3GPP standard included downlink MIMO operat

ion as well as support for higher order modulation up to 64-QAM in the uplink and 16-QAM in the downlink. However it only allows for either MIMO or the higher order modulation. It also introduced protocol enhancements to allow the support for Continuous Packet Connectivity (CPC).  Release 8: This release of the standard occurred during the course of 2008 and it defines dual carrier operation as well as allowing simultaneous operation of the high order modulation schemes and MIMO. Further to this, latency is improved to keep it in line with the requirements for many new applications being used.  Release 9: 3GPP Release 9 occurred during 2009 and included facilities for HPSA including 2x2MIMO in the uplink and a 10MHz bandwidth in the downlink. The uplink carriers may be from different bands.  Release 10: HSPA Release 10 utilises up to 4-carriers, i.e. 20 MHz bandwid

th which may be from two separate bands. In addition to this 2x2 MIMO in the downlink provides data rates up to 168 Mbps. This figure equates to that obtained for LTE Release 8 when using comparable bandwidth and antennas configurations.

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  Release 11: Release 11 occurred during 2011 / 2012. It provided the facility for 40MHz bandwidth in the uplink along with up to 4x4 MIMO. The downlink was upgraded to accommodate 64-QAM modulation and MIMO.  Release 12: This 3GPP release is occurring in 2013 / 2014.

3G HSPA is able to provide very high speed data transmission, competing with the top performance of LTE and LTE-A