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8/9/2019 GSM_Chann.ppt
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GSM LOCATION UPDATE
MS NEW VLR HLR OLD VLR
Location Update request
Update location request
Insert Subscriber Data
Insert Subscriber Data Ack
ancel Location
ancel Location Ack
Update location request Ack
Update location request Ack
Send Aut!entication In"or#ation
$riplets %RAND& SERS& 'c(
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Description of GSM LU: -
• Mobile Set containing the IMSI ( E.212 - International Mobile Subscriber Identity) of the subscriberand send it to New !".
• New !" will #erfor$ the IMSI analysis and send the SAI (Send %uthentication Infor$ation) to &!".S%I $essage 'ontaining MGT (E.21 - Mobile lobal *itle) which will go on Nu$bering +lan -,.
• &!" will send the triplets 'hi##ing ey (c)/ Signed "es#onse (SE"S)/ "ando$ alue ("%N0) toNew !".
• New !" will erify the tri#lets with MS generated tri#lets. %fter eri3cation new !" will send the
u#date location re4uest to &!". 5#date location $essage will go on N+ 6,.
• &!" will send the ISD (Insert Subscriber 0ata) to new !".
• New !" will send the IS0 ac7nowledge$ent to &!".
• &!" will send the cancel location re4uest to old !".
• 8ld !" will send the cancel location ac7nowledge$ent to &!".
• &!" will send the !ocation 5#date ac7nowledge$ent to New !".
• New !" will send the !ocation 5#date ac7nowledge$ent to MS and MS will latched on to new !".
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GPRS LOCATION UPDATE
MS S)SN HLR * AU
+"S %ttach "e4uest
Send %uthentication Infor$ation
*ri#lets ( c/ "%N0/SE"S)
5#date !ocation re4uest
Insert Subscriber 0ata
Insert Subscriber 0ata%c7nowledge$ent
5#date !ocation
%c7nowledge$ent
+"S %ttach "e4uest 'o$#lete
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Description Of GPRS LU
• MS sends the +"S attach $essage to SSN.
• SSN( Serice +"S Su##ort Node) will send the S%I to &!".
• &!" will send the *ri#lets ( c/ SE"S/ "%N0) to SSN.
• SSN will erify the tri#lets with the MS generated tri#lets.
• SSN will send the 5#date !ocation "e4uest to &!".
• &!" will send the IS0 to SSN.
• SSN will send the IS0 ac7nowledge$ent to &!".
• &!" will send the 5#date !ocation %c7nowledge$ent to SSN.
• SSN will send the +"S attach res#onse to MS.
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SMS CALL FLOW
MS1 MS2 MS'19
!"
MS'29
!"
SMSgwy 9
SMS'
&!"
Sub$it SM
:orward M8SM
%c7
%c7
:orward M*SM
%c7
%c7
0elierSM
Send routing
info
"outinginfo
0eliery ac7nowledge$ent
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Description Of SMS Flo
• MS-1 will send the sub$it SM to !" -1.
• !" -1 will send the forward M8 SM $essage to SMS' ( Short Message Serice 'enter).
• SMS' will send the ac7nowledg$ent to !" -1.
• !" -1 will send the ac7nowledge$ent to MS -1.
• SMS' will send the S"I (Send routing Info) to &!".
• &!" will send the S"I ac7nowledge$ent to SMS'.
• SMS' will send the :orward M* SM $essage to !" -2.
• !" -2 will send the delier SM $essage to MS -2.
• MS -2 will send the ac7nowledge$ent to !"-2.
• !" -2 will send the ac7nowledge$ent to SMS'.
• SMS' will send the deliery ac7nowledge$ent to MS -1.
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MO!ILE ORIGINATED CALL
