BMW LCI 3 2015 Series Operating Manual page 34

3￿Series LCI
5.￿Information￿and￿Communication
Index
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2
3
4
5
6
7
8
9
10
11
12
13
14
15
Long￿Term￿Evolution￿(LTE)
Long￿Term￿Evolution￿(LTE)￿is￿a￿4th￿generation￿(4G)￿mobile￿radio￿standard.￿LTE￿can￿achieve￿a
significantly￿higher￿download￿rate￿with￿up￿to￿100￿MBit/s.￿The￿basic￿diagram￿of￿UMTS￿is￿retained￿for
LTE.￿A￿quick￿and￿reasonable￿changeover￿of￿the￿infrastructures￿of￿the￿UMTS￿technology￿(3G￿standard)
to￿LTE￿Advanced￿(4G￿standard)￿is￿therefore￿possible.
The￿frequency￿ranges￿used￿differ￿depending￿on￿the￿region,￿and￿vary￿from￿about￿700￿to￿2600￿MHz.
The￿term￿"Frequency￿Division￿Duplex"￿is￿understood￿as￿transmission￿and￿receiving￿from￿cell￿and
base￿stations￿on￿tow￿different￿frequency￿bands:￿The￿mobile￿device￿transmits,￿in￿the￿Uplink￿channel,
while￿the￿base￿station￿transmits,￿in￿the￿Downlink￿channel.￿Each￿of￿the￿two￿frequency￿ranges￿have￿a
bandwidth￿of￿5￿MHz.￿Expressed￿simply,￿this￿means￿that￿2￿transmitters￿and￿2￿receivers￿in￿each￿case
transmit￿and￿receive￿simultaneously￿with￿2￿different￿frequencies.
With￿MIMO￿technology￿(Multiple￿Input￿Multiple￿Output),￿it￿is￿possible￿for￿mobile￿radio￿providers￿to
offer￿data￿speeds￿with￿a￿low￿error￿rate.￿MIMO￿is￿the￿basis￿for￿a￿special￿encoding￿procedure￿which￿uses
both￿temporal￿and￿also￿spatial￿dimensions￿for￿information￿transfer￿(Space-Time￿Coding).
As￿a￿result,￿the￿quality￿(bit￿error￿frequency)￿and￿data￿rate￿of￿a￿wireless￿connection￿can￿be￿improved
significantly.￿MIMO￿systems￿can￿transmit￿considerably￿more￿Bit/s￿per￿Hz￿bandwidth￿used,￿and￿are￿thus
more￿efficient￿than￿conventional￿systems.￿In￿order￿to￿realise￿the￿MIMO￿technology￿at￿BMW￿bothdata
antennas￿present￿in￿the￿vehicle￿area￿used￿simultaneously￿for￿the￿first￿time￿for￿the￿LTE￿connection.
MIMO￿operates￿similar￿to￿the￿antenna￿diversity￿in￿the￿radio￿system.￿The￿signal￿of￿both￿antennas￿is
sent,￿evaluated￿and￿combined￿to￿minimize￿errors￿and￿optimize￿data￿speed.
Explanation
Crash￿Safety￿Module￿(ACSM)
Roof￿function￿Center￿(FZD)
Front￿Electronic￿Module￿(FEM)
SOS￿speaker
Head￿unit
Center￿console￿telephone￿base￿plate
Emergency￿GSM￿aerial￿(in￿the￿TCB2)
Telephone￿aerial￿base￿plate￿(roof-mounted￿aerial)
SDARS
Telematics￿service￿telephone￿aerial￿(roof-mounted￿aerial)
GPS￿aerial￿(roof-mounted￿aerial)
Telematic￿Communication￿Box￿2￿(TCB2)
Fuse
Rear￿Electronic￿Module￿(REM)
Microphone,￿driver's￿side
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