this ppt realated to lab persentation of gsm

2. GSM Network Architecture
B
T
S
MSC VLR
HLR
PSTN
ISDN
Data
Networks
(
Air interface
OSS
B
T
S
B
T
S
MSC VLR
BSCBSC
EIR
AuC

4. GSM: Speech to Radio waves
Speech Coding
Channel Coding
Interleaving
Burst formatting
Ciphering
Burst formatting
Deciphering
Analog
Modulation
200kHz BW
Speech Decoding
Analog
200kHz BW
Demodulation
De-interleaving
Channel Decoding
4

5. NORMAL BURST
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
57 bits 57 bits26 bits 33
FRAME1(4.615ms)
FRAME2
Training
sequence
Data Data
Tail
Bits
Tail
Bits
Flag
Bit
Flag
Bit
Guard
Period
Guard
Period
0.546ms
0.577ms
Carries traffic channel and control channels BCCH, PCH, AGCH, SDCCH,
SACCH and FACCH.

6. Logical Channels
Logical
Channels
Traffic
Channels
Control
Channels
TCH/F
TCH/H
Common
Control
Channels
Dedicated
Control
ChannelsBroadcast
Channels
SDCCH
SACCH
FACCH
RACH
PCH
AGCH
FCCH
SCH
BCCH
7

7. TAX
CA
TAX
ND
GMSC MSC
GMSC
MSC/VLR
UPW BSNL Mobile moves to CA and Powers on MS
CA
UPW
HLR
HLR
ND
MS
9412******
CA
ND
( Update Location/
Authentication )
De register
Mobile to
Old VLR
ACK from
old
MSC/VLR
VLR
LOCATION UPDATING
VLR
VPLMN
HPLMN
Location Update
( TMSI, LAI )
LU Accept
( New TMSI)
Update
Location
Update
Location
LU Accept
(Subs data)
LU Accept
Update
Location
LU Accept
LU Accept
New VLR records
subscriber data.
• Listens
BCCH/FCCH

8. MS BTS MSCBSC
RIL3 - CM
LAPD m
Layer 1
RIL3 - MM
RIL3 - RR
Layer 1
LAPD m LAPD
Um A bis A link BCDEFG
MTP
SCCP
BSSMAP
DTAP
MM
TCAP
DTAP
CM
U
PSCCP
M
A
P
Layer 1Layer 1
GSM Signaling Protocols
LAPD MTP
I
S
SCCP
BSSMAP
BTSM
RIL 3-
RR
BTSMRR

9. Architecture For Mobile Terminated Call
GMSC- B BSS-B
MS
VLR-B
MSC-B
VISITING PLMN
A- Interface
Air Interface
HLR-B
IAM ( ISUP )