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Course Outlines• 1-basic communication concepts
• 2-GSM introduction
• 3-GSM system architecture
• 4-GSM system interface
• 5-GSM radio Link
• 6-Mobility Management
• 7-call management
• 8-Radio Resource Management
• 9-GSM system Services
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CALL MANAGEMENT
Objectives:1-Mobile-to-land call scenario
2-Land-to-Mobile call scenario
3-Mobile-to-Mobile call scenario
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1-Mobile to Land
• Phases:
• 1-Request for service
• 2-Authentication
• 3-Ciphering
• 4-Equipment Validation
• 5-Call Setup
• 6-Handover • 7-Call release
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Mobile to Land (cont.)
• Phase 1: REQUEST FOR SERVICE
MS BSS MSC/VLRUm A
1Channel Request
RACH
2
3
SDCCH AssignmentAGCH
SDCCHService Request
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2-Authentication Phase
MS BSS
MSC/VLR
HLR
Um A
2
Get Authentication parameters(IMSI)
1
4
Authentication parameters
(SRES,Kc,RAND)Authenticate MS
(RAND)
3SDCCH
SDCCH
Authentication Response
(SRES)
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3-Ciphering Phase
MS BSS
MSC/VLR
Um A
2
1
4
Cipher-Uplink-channel
3
SDCCHUplink-channel-Ciphered
SDCCH
Cipher-radio-channel (Kc)
Ciphering Complete
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4-Equipment Validation Phase
MS BSS
MSC/VLR
EIR
Um A
2
1
4
3
IMEI Response (IMEI)
SDCCH
IMEI Request
IMEI Check Result
SDCCH
Check IMEI
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Mobile to Land (cont.)
• Phase 5: Call Setup Phase
MS BSS MSC/VLRUm A
1Call Setup Request
SDCCH
2 Call proceeding
SDCCH
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Mobile to Land (cont.)
• Phase 5: Voice Path Establishment {with MS-MSC}
MS BSS MSC/VLRUm A
1
Assign Trunk&Radio
2Assign TCH
SDCCH
3Radio Assignment Complete
SDCCH Trunk & Radio Channel
Assignment Complete4
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Mobile to Land (cont.)
• Phase 5: Voice Path Establishment {with MSC-PSTN}
MS MSC
/VLR
Um ABSS PSTN
1 Network Setup (DD)
2 Network Alerting
3FACCH
Alerting
4Connect (answer)
Start Billing5
ConnectFACCH
6
Connect Aknowledge
FACCH
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Mobile to Land (cont.)
• Phase 7: Call Release
MS MSC
/VLR
Um ABSS PSTN
2 Network Release
3 FACCH
Releasestop Billing
1Disconnect
FACCH
4
Release Complete
FACCH
Clear Command5
Channel ReleaseFACCH6
7Clear Complete
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2- Land to Mobile
• Phases:• 1-Routing Analysis
• 2-Paging
•
3-Authentictaion• 4-Ciphering
• 5-Equipment Validation
•
6-Call Setup• 7-Handover • 8-Call release
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Land to Mobile (cont.)
• Phase 1: Routing Analysis
MSC
/VLR
GMSC
HLR PSTN
Incoming Call (MSISDN)
Get Rout (MSISDN)
Get Rout (IMSI)
Routing info (MSRN)
Routing info (MSRN)
Incoming Call (MSISDN)
1
2
3
5
4
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Land to Mobile (cont.)
• Phase 2: Paging Phase
MS BSS MSC/VLRUm A
1
Channel Request
RACH
2
3
SDCCH Assignment
AGCH
SDCCH
Page Response (TMSI,LAI)
Perform Page (TMSI)Page
PCH
4
5
Page Response
6
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3-Authentication Phase
MS BSS
MSC/VLR
HLR Um A
2
Get Authentication parameters(IMSI)
1
4
Authentication parameters
(SRES,Kc,RAND)Authenticate MS
(RAND)
3
SDCCH
SDCCH
Authentication Response
(SRES)
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4-Ciphering Phase
MS BSS
MSC/VLR
Um A
2
1
4
Cipher-Uplink-channel
3
SDCCHUplink-channel-Ciphered
SDCCH
Cipher-radio-channel (Kc)
Ciphering Complete
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5-Equipment Validation Phase
MS BSS
MSC/VLR
EIR
Um A
2
1
4
3
IMEI Response (IMEI)SDCCH
IMEI Request
IMEI Check Result
SDCCH
Check IMEI
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Land to Mobile (cont.)
• Phase 6: Call Setup Phase
MS BSS MSC/VLRUm A
1 Call Setup Request
SDCCH
2 Call Setup confirmation
SDCCH
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Land to Mobile (cont.)
• Phase 6: Voice Path Establishment {with MS-MSC}
MS BSS MSC/VLRUm A
1
Assign Trunk&Radio
2Assign TCH
SDCCH
3
Radio Assignment Complete
SDCCH Trunk & Radio Channel
Assignment Complete4
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Land to Mobile (cont.)
• Phase 6: Land Network
MS MSC
/VLR
Um ABSS PSTN
1Mobile Alerting
2 Network Alerting
3FACCH
4
Connect
Connect-off Hook
5Connect Acknowledge
FACCH
FACCH
GMSC
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Land to Mobile (cont.)
• Phase 8: Call Release
MS MSC
/VLR
Um ABSS PSTN
1 Network Release
3 FACCHRelease
2Disconnect
FACCH
4
Release Complete
FACCH
Clear Command5
Channel ReleaseFACCH6
7Clear Complete
GMSC
HLR
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3-Mobile To Mobile Call scenario
• The Mobile-to-Mobile call is established
using the same phases as seen earlier.
• It can be subdivided in two parts:
• 1-Originating Mobile
• 2-Terminating Mobile
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Course Outlines• 1-basic communication concepts
• 2-GSM introduction
• 3-GSM system architecture
• 4-GSM system interface
• 5-GSM radio Link
• 6-Mobility Management
• 7-call management
• 8-Radio Resource Management
• 9-GSM system Services