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SPECIFICATIONS
Radio system. Access Method - TDMA/FDMA
Frequecy !adsMo"i#e to Ce## - $%&-%'( Mh) *+P,IN
Ce## to Mo"i#e - %(-%0& Mh) *DO1N,IN
There2ore the 2requecies 2or the u3#i4 ad thedo5#i4 are di22eret * Frequecy Di6isioDu3#e7 ad the "ad5idth o2 the 8SM Systemis 9( Mh)..
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Itroductio to 8SM
:istory o2 Ce##u#ar Mo"i#e Radio
ad 8SM*8#o"a# Systems 2or
Mo"i#e
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:istory o2 Ce##u#ar Mo"i#e Radio
ad 8SM*8#o"a# Systems 2orMo"i#e
. Ear#y '%$&s there 5as aa#o;
techo#o;iesOS
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8SM 2acts*9&&'
+sed i o6er '?&
coutries
. O6er @&& 8SM
et5or4 o3erators
. O6er ((& mi##io
3eo3#e 5ere
su"scri"ers to 8SM
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8SM Ce## Structure
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Nei;h"ori; ce##s caot share
the same chae#s
. Di22eret si)e o2
3atters< @=?='9 or 9'ce##s i oe c#uster
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Ty3es o2 Ce##s
Macrocells(3 to 35 km)
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Ty3es o2 Ce##s
Microce##s*&=' to ' 4m
- Picoce##s*&=&' to '4m
- Naoce##s*'m to '&m
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Se#ecti6e ce##s
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+m"re##a ce##s
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*!TS
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!ase Tracei6er Statio
. ser6es a si;#e ce##
. usua##y 3#aced i the ceter
o2 a ce## . codi;
. cry3ti;
. mu#ti3#e7i; . modu#ati;
. sychroi)i;
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!ase Statio Cotro##er*!SC
. tras#ates the '-"3s 6oice to the
stadard
0@-"3s chae# *used "y PSDN or ISDN . 2requecy ho33i;
. time ad 2requecy sychroisatio
. 3o5er maa;emet
. time de#ay measuremets
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!SS
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Mo"i#e S5itchi; Ceter*MSC
. The cetra# com3oet o2 the Net5or4
Su"system
. *& 9B 0@"3s 9=&@$M"3s*E' or "etter to the other et5or4 iter2aces*PSDN=ISDN
. !i##i;
. ,ocatio re;istratio
. 8ate5ay to SMS . Sychroi)i; !SS
. :ado6er maa;emet
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8SM Architectures "road
3arts '. Su"cri"ers carries MO!I,E STATION
9. !SS cotro#s the radio #i4 5ith the
mi"i#e statio
. NET1OR S+!SSTEM= 5hich mai
3art is MSC
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The Re;isters
. :ome ,ocatio Re;ister *:,R cotais a##
i2ormatio o2 each su"scri"er re;istered i the
corres3odi; 8SM et5or4
. isitor #ocatio Re;ister *,R cotais se#ected
i2ormatio 2rom the :,R= 5hich is ecessary 2or
ca## cotro# ad 3ro6isio o2 the su"scri"ed ser6ices=
2or each mo"i#e curret#y #ocated i the ;eo;ra3hica# area cotro##ed "y the ,R
. NSS :,R ,R MSC
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. Equi3met Idetity Re;ister *EIR
cotais a #ist o2 a## 6a#id mo"i#e equi3met
o the et5or4 . Autheticatio Ceter *A+C stores a co3y
o2 the secret 4ey stored i each su"cri"ers
SIM card . EIR ad A+C are used 2or security ad
autheticatio 3ur3oses
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SPECIFICATIONS
Cell To Mobile Down Link
Mobile to Cell Up Link
935-960 Mhz
1805-1880 Mhz
890-915 Mhz
1710-1785 Mhz
BTS
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SPECIFICATIONS
Chae# !ad5idth 9&& h)
Num"er o2 Chae#s '9@ chae#s
3airs * 9( Mh)/9&& h) are
a6ai#a"#e s3aced at 9&& h)
iter6a#s.Du3#e7 s3aci;-@( M:)
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I '$&& M:) !ad
!ad5idth 9&& :)
?@ carrier 2requecy 3airs
Du3#e7 s3aci; is %( M:).
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8SM - M+,TIP,E ACCESS GSM uses both FDMA & TDMA
Freq
Mhz.890.2
1
890.4
2
890.6
3
890.8
4
891.0
5 6
914.8
124
FDMA Access along Frequency a!s
"o#al 124 $F %hannels a&a!la'le.
(ne or )ore carr!er ass!gne* #o each 'ase s#a#!on
A'solu#e $a*!o Freq %arr!er +u)'er ,A$F%+ 1 124 no# use* un#!ll !# !s co-or*!na#e* /!#h +on -M oera#ors !n a*acen# req. 'an*s.
n )os# cases 124 $F %hannels are use*
...
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S3eci2icatios
There2ore the actua# 2requecy o2 a
ARFCN is
Fu#* $%&.& Mh) *&.9 Mh)BAd Fd#* Fu#* @( Mh)
1here 'GG'9@
akp\!"C#$BS#L%&ls
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FDMA/TDMA
Each chae# 3air ser6es ei;ht chae#s successi6e#y i
a Timed Cyc#e.
I FDMA system each chae# requires a trasmitter
ad recei6er
$ oice chae#s= sta;;ered i Time are trasmitted 6ia
oe carrier 2requecy
Each o2 the '9@ FDMA #i4ed carrier 2requecy is used
to trasmit $ TDMA 6oice chae#s
Discotiuous ature o2 TDMA ma4es the etire 9&& h)
"ad5idth a6ai#a"#e to a## $ oice chae#s.
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GSM
FDMA
25 Mz 25 Mz
Mobile to Base
1 9 3
890.2 890.4 890.6*MHz
Base to Mobile
1 9
93!.2 93!.4 93!.6
200 "Hz@(M:)
%hannel layou# an* requency 'an*s o oera#!on
890 935 960915
200 "Hz
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8SM
TDMA
$?
0(
@
9'
$?
0(
@
9'
4! MHz
F#e$ue%'
F2(F1()*ell t#a%s+it
F2F1)*ell ,-
A+litu/e
"y!cal "DMA FDMA ra)e s#ruc#ure
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1
2
3
4
!
6
8
200 Hz
F#e$ue%'
Ti+e
TDMAFDMA
' (3)5*+,
