1G

safflowerpepperoniΚινητά – Ασύρματες Τεχνολογίες

24 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

85 εμφανίσεις

0G (Mobile Radio Telephone System)


Pre
-
cellular system


Half
-
Duplex communication


Use in vehicles


Only 25 channels available


20Km
range

0G (Mobile Radio Telephone System)

1G


First
-
generation wireless
communication technology standards


Originated in the 80’s


Analog signal (AMPS)


Low reach


Low bit
-
rate (9600 bps)


High interference


Low traffic capacity


“Brick”
Phones
-

5 kg weight, battery
last 30 minutes of conversation

1G

1G

2G


First great update on mobile
communication


Introduced in the 90’s


Fully digital network


GSM


first
standard


Better voice encoding


Bit rate: 38 kbps


Less battery power necessary


Lower power emissions


Digital data services


More signal security


More calls on the same network

2G

2.5G


GPRS
-

Newer and better
bandwidth technology


Bit
-
rate
: 114 kbps

2.75G


EDGE technology


Bit rate: 236,8 kbps

Intermediate technologies: 2G



Newer

and

better

bandwidth
technologies

3G


WCDMA
technology (384kbps
)



Wide brand wireless
network



Packet
switching



Global
roaming



Fast communication, internet
access, mobile TV, gaming


4G


HSPA+ (42 Mbps/11,4 Mbps)
-

in
theory is possible 168mbps


Much faster
receive/send
speed and
capacity



Comprehensive and secure all
-
IP
based solution:

--
> IP
telephony

--
> Ultra
-
broadbrand

internet access

--
>
Gaming
services

--
> HDTV
streamed multimedia

3.5G


HSDPA technology (7.2 Mbps
download
/ 384
kbps upload)

3.75G


HSPA

technology (14,4 Mbps / 5,8
Mbps)

Intermediate

technologies
:

3G