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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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3

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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3

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