Logical Channels & Multi-Frame Structures
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Transcript of Logical Channels & Multi-Frame Structures
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Logical Channels and Multiframe Structures
Khizar Mahmood Zia & Safdar Yaseen
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LOGICAL CHANNELS
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LOGICAL CHANNELS
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CONTROL CHANNELS
Broadcast Channel (BCCH):
Transmitted by the BTS to the MS. This channe carries system!arameters needed to identi"y the net#or$% synchroni&e timeand "re'(ency #ith the net#or$% and )ain access to the
net#or$. Common Control Channels (CCCH):
*sed "or si)nain) bet#een the BTS and the MS and to re'(estand )rant access to the net#or$.
edicated Control Channels (CCH):*sed "or dedicated comm(nication s(ch as ca set(!% SMS%Location Area *!dated
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BROA+CAST CONTROL CHANNELS
Broadcast Control Channels (BCCH):
Broadcast Contro Channe sends net#or$,s!eci"ic in"ormations(ch as radio reso(rce mana)ement and contro messa)es%Location Area Code etc.
!CCH :
Mobie corrects the "re'(ency o" its interna time base byreadin) this o)ica channe.
SCH :
Carries the in"ormation "or mobie to synchroni&e to the T+MA"rame str(ct(re - $no# the timin) o" the Indiid(a timesots./rame N(mber - BSIC 0Base Station Identity Code1.
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COMMON CONTROL CHANNELS
"#CH: Transmitted by the MS #hen it #ishes to )ain access tothe system$
%CH: Transmitted by the BTS #hen it #ishes to contact as!eci"ic mobie.
#CH: Transmitted by BTS to assi)n a dedicated reso(rce toMS s(ch as S+CCH
CBCH: Trans"er Messa)e #ith in a ce to a mobies.
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+E+ICATE+ CONTROL CHANNELS
Stand #lone edicated Control Channels (SCCH):
*sed d(rin) Ca Set(!% Location Area *!date% SMS
Slo' #ssociated Control Channel (S#CCH)$
Coneys !o#er contro and timin) in"ormation in the do#nin$direction 0to#ards the MS1 and Receie Si)na Stren)th Indicator0RSSI1% and in$ '(aity re!orts in the (!in$ direction.
!ast #ssociated Control Channel (!#CCH)$
The /ACCH is transmitted instead o" a TCH. The /ACCH 22steas3
the TCH b(rst and inserts its o#n in"ormation. The /ACCH is (sedto carry o(t (ser a(thentication% handoers and immediateassi)nment.
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TRA//IC CHANNELS
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CHANNEL COMBINATIONS
/( Rate Tra""ic Channe Combination 4 TCH56/ACCH 7 SACCH
Broadcast Channe Combination 4 BCCH 7 CCCH
+edicated Channe Combination 4 S+CCH5 7 SACCH5
Combined Channe Combination 4 BCCH7CCCH7S+CCH87SACCH8
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M*LTI,/RAME STR*CT*RES
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TRA//IC CHANNEL M*LTI/RAME
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CONTROL CHANNEL M*LTI/RAME
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BCCH6CCCH M*LTI/RAME
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+CCH65 M*LTI/RAME
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COMBINE+ M*LTI/RAME
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S*9ER /RAMES - H:9ER /RAMES