1 Network Architecture
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Transcript of 1 Network Architecture
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System Model
AUC
HLR EIR
SS
BSS
MSC
BTS
MS
NMC and OMC
Switching System
Signaling transmission
Call connections and
signaling transmission
Base Station System
Other
networks
BSC
GMSC
VLR
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Network elements in GSM
MS
PLMN
PSTN
ISDN
AUC
EIRHLR
VLR
MSC
BSC
BTS
GMSC
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SA2
MSC
VLR
MSCMSC
VLR
BSC BSC
LA1LA2
GMSC
MSC
BTS
SA1
HLR
AUC
EIR
SA - Service Area
LA - Location Area
BTS - Base Transceiver Station
BSC - Base Station Controller
MSC - Mobile Switching Center
VLR - Visitor Location Register
GMSC - Gateway MSCEIR - Equipment Identity Register
AUC - Authentication Center
HLR - Home Location Register
Mobile identity
SIM card
Network Hierarchy
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GSM interfaces
MS BTS BSC MSC
Um Abis A
The Um interface is the interface between the MS and the RBS. Other name of this interface is Air interface as the communication isin the air
The terms BSC and RBS are for the nodes in the BSS. Abis is the name of the interface connecting the two nodes. Various kinds of
information is transferred over the Abis interface like synchronization information, traffic (speech, data, fax, etc.), in-band signaling.
The interface separating the BSS from the MSC is called the A interface. It not only supports messages between the MSC and BSS,
but also messages between the MSC and MS.
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Macro, Mini, Micro and Indoor Cells
Antenna positions
Macro
Mini
MicroPico
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Relation Between Areas in GSM
GSM Service Area
PLMN Service Area
(one per operator)
MSC Service Area
Location Area
Cell
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Authentication Procedure
MSC/VLR
1. RAND
3. SRES
MS
2. MS calculates SRES using RAND + Ki(SIM-card) through A3 and Kc using RAND+Kithrough A8.
4. Compare SRES received fromMS with SRES in triplet. If theyare equal access is granted.
MSC/VLR Mobile service Switching CenterMS Mobile StationRAND Random number
SRES Signed Response
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Authentication in GSM
VLR
MSC
HLRAUC
Subscriber number (IMSI)Code key (Ki)
Random n umb er (RAND)Signal resp ons e (SRES)
RAND / SRES
RAND
SRES
Figure D.6.4
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Equipment Identification
MSC/VLR
MS
EIR
3. Check IMEI
4. Access/barring info
1. IMEI request
2. IMEI
IMEI International Mobile station Equipment IdentityEIR Equipment Identity RegisterMSC/VLR Mobile services Switching Center
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GSM Modes
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Operation Overview
Attached (On)
Detached (Off)
Idle
Busy
Roaming
Paging
Handover
Mr. Bond!!
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Monitoring BCCH Carriers
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Frequency bands for the different GSM-based
networks. (Values within brackets refer to E-GSM)
Network type
GSM 900 (880)890-915/(925)935-960 MHz GSM 900
GSM 1800 1710 - 1785/1805 -1880 MHz GSM 1800
GSM 1900 1850 - 1910/1930 -1990 MHz GSM 1900
EricssonsImplementations
Frequency bandUL/DL
WCDMA 1920 - 1980/2110 -2170 MHz UMTS
WiMax 2.5 - 66 GHz
Standard GSM 900 GSM 1800 GSM 1900
Duplex dist. 45 MHz 95 MHz 80 MHz
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Basic TDMA frame, timeslot, and burst structures
0 1 2 3 4 5 6 7
4.615 ms
3 57 1 26 1 57 3
Burst148 Bits
156.25 Bits0.577 ms
DataTrainingData