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Wireless Curriculum Development SectionWireless Curriculum Development Section
ISSUEISSUE
OMA000003 GSMOMA000003 GSM
Communication FlowCommunication Flow2020
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2
!an"over Se#uence
SMS Se#uence
$ocation Up"ate Se#uence
GSM %asic Call Se#uence
CONTENT
GSM Securit& Mana'ement
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GSM Security Management
Authentication and
Ciphering Sequence
TMSI
Reallocation
Equipment
Identification
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(
Authentication
Authentication may beAuthentication may be
executed during setup,executed during setup,
location updating andlocation updating andsupplementary servicessupplementary services
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)
Authentication Sequence
KIM)
KIN)
IMSI(m)
RAND
GENERATORA8 A3
KI(IMSI)
IMSIBUFFER
RAND
RANDRAND
RAND
KC
1
2
5
KC
KC
KC
SRES
SRESSRES
SRES
TEMP
DATA
AUC
HLR/AUC
HLR
AUTH REQ
RAND
KC
SRES
RAN
DA8 A3
SRES
EQUAL
CKS
NKC
BSS
KI(IMSI)
VLR SIM
RAND 16byte
KI 16byte
kc 8byte
SERS 4byteCKSN lo !b"t# o$1byte
IMSI(%)
SRESKI I MSI +RAND A3
KI (I MSI )+RANDA8
KC
M+KC A5 KC(M)(MS/BSS)
KC(M)+KC MA5
(MS/BSS)
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*
Authentication and Ciphering Sequence
HLRMS BSS MSC VLR
1 Pre-send Triples to VR
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+
HLRMS BSS MSC VLR
,A-D
,A-D
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/
HLRMS BSS MSC VLR
,A-D
,A-D
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1
HLRMS BSS MSC VLR
,A-D
,A-D
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0
HLRMS BSS MSC VLR
$ Cipher Mode Command
Cipher Mode Complete
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TMSI Reallocation
MS $,
ocation %pdate Req
ocation %pdate Acc
TMSI Reallocation Comp
45MSI
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2
Equipment Identification
MS %SS MSC $, !$, 6S5- E#uipment ID
,e#uest7SDCC!.
EI,
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MS %SS MSC $, !$, 6S5- E#uipment ID
,e#uest7SDCC!.
2 ID ,esponse
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(
MS %SS MSC $, !$, 6S5- E#uipment ID
,e#uest7SDCC!.
2 ID ,esponse
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)
GSM Baic Call Sequence
Mo:ile to $an" Se#uence
$an" to Mo:ile Se#uence
Mo:ile Initiate" CallClearin' Se#uence
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*
GSM Baic Call Sequence
58e process ;or callin' MS an" calle" MS are two
in"epen"ent ;low 58e callin' part& :e'ins wit8
c8annel re#uest an" en"s wit8 5C! assi'nment
competition In 'eneral< t8e callin' part& inclu"es
;ollowin' several sta'es= access processample< in t8is se#uence