mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
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GSM stan<strong>da</strong>rtSi gamoiyeneba modulacia sixSiruli<br />
zolis normirebuli sididiT _ BT=0,3. sa<strong>da</strong>c<br />
B – filtris zolis siganea 3 db-ze, xolo T _ erTi<br />
bitis ga<strong>da</strong>cemis droa.<br />
GMSK signalis formireba xorcieldeba I/Q<br />
kvadraturuli modulatoriT, romelic Sedgeba ori<br />
gamamravlebelisagan <strong>da</strong> erTi amjamvelisagan.<br />
GMSK modulacia xasiaTdeba Semdegi TvisebebiT:<br />
_ donis mixedviT mudmivi momvlebiT, romelic<br />
saSualebas iZleva gamoyenebul iqnes C klasis gamaZliereblebis<br />
Semcveli ga<strong>da</strong>mcemi mowyobilobebi;<br />
_ viwro speqtriT ga<strong>da</strong>mcemi mowyobilobebis gamosasvlelze,<br />
rac uzrunvelyofs zolgareTa gamosxivebis<br />
<strong>da</strong>bal dones;<br />
_ kavSiris arxis xelSeSlebis mimarT maRali<br />
mdgradobiT.<br />
3.1.1. GSM qselebis arqiteqtura <strong>da</strong><br />
misi struqturuli elementebi<br />
GSM qselebi (iseve, rogorc msgavsi qselebi) Sedgeba<br />
<strong>mobiluri</strong> (radiotelefonebi) <strong>da</strong> sabazo sadgurebisagan,<br />
cifruli komutatorebisagan, marTvisa<br />
<strong>da</strong> momsaxurebis centrisagan, sxva<strong>da</strong>sxva <strong>da</strong>matebiTi<br />
<strong>sistemebi</strong>sa <strong>da</strong> mowyobilobebisagan. sistemis elementebis<br />
funqcionaluri SeuRleba xorcieldeba<br />
rigi interfeisebis meSveobiT.<br />
GSM <strong>sistemebi</strong>s agebis princi pebi <strong>da</strong> Sesabamisi<br />
interfeisebi mocemulia nax. 3.3-ze.<br />
<strong>mobiluri</strong> sadgurebi MS (Mobil Station) Sedgeba rigi<br />
specifikuri mowyobilobebisagan. GSM stan<strong>da</strong>rtis<br />
farglebSi miRebulia <strong>mobiluri</strong> sadgurebis 5 klasi<br />
70<br />
(ix. cxrili 3.2). <strong>mobiluri</strong> <strong>da</strong> sabazo sadgurebi<br />
erTmaneTisagan <strong>da</strong>moukidebelia.<br />
nax. 3.3. GSM qselis zogadi struqturuli sqema<br />
modelis klasi<br />
moZrav sadgurTa klasifikacia<br />
ga<strong>da</strong>cemis maqsimaluri<br />
simZlavre, vt<br />
71<br />
cxr. 3.2<br />
<strong>da</strong>saSvebi ga<strong>da</strong>xrebi,<br />
1 20 1,5<br />
2 8 1,5<br />
3 5 1,5<br />
4 2 1,5<br />
5 0,8 1,5<br />
Setyobinebebis ga<strong>da</strong>cemisas gaTvaliswinebulia<br />
ga<strong>da</strong>cemis simZlavris a<strong>da</strong>pturi regulireba, rac<br />
uzrunvelyofs kavSiris aucilebel xarisxs.<br />
TiToeul mobilur sadgurs aqvs sakuTari saer-<br />
TaSoriso saidentifikacio nomeri (IMSI-International<br />
Mobile Subscriber Identity), romelic Cawerilia mis maxsovrobaSi.<br />
TiToeul mobilur sadgurs eniWeba kidev<br />
db
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