Monday, July 23, 2012

Differences of GSM, GPRS, UMTS and HSDPA

1. GSM: 2G Europian standard and the first digital mobile system. It offers only
circuit-switched traffic (i.e voice calls,
SMS...etc) and data transfer at very low
bitrates 9.6kbps.

2. GPRS: also reffered to as phase 2+. It offered packet-switched traffic with
new network components integrated
over the existant GSM core network.
This allowed data bitrates to increase
to 171kbps. It is also considered as the
first step towards 3G networks.

3. EDGE: It was made to cover the delay of delivery of 3G/UMTS network.
It supported data rates upto 384kbps.

4. UMTS: the first 3G Europian standard network. It is the optimal solution for
GSM operators to support 3G services.
The Air interface technique used for
this network is WCDMA. This technique
allowed data rates to reach 2Mbps.

5. HSDPA: It is actually a software upgrade to the UMTS network using
the same air interface technique used
in UMTS (WCDMA) and supporting data
rates upto 10Mbps.

Q: Why is my internet connection intermittent despite full HSDPA signal?
A: The service that you receive on your connection depends partly on how
busy the network is. Voice and text
users take priority over dongle (data)
users, so when the network is
particularly busy, data speeds may be
slow even though signal strength is high. Conversely when the network is
not busy, you may get fast data speeds
although you barely have a signal.
Unfortunately you can only influence
this aspect of service by connecting at
less sociable hours.

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