bahan presentasi Knowledgefest 2014

1. 

Oleh :Hary Johari Mansur
hary.j.mansur@gmail.com

2. 

GSM Transmission Networks
RAN
◦ GERAN
◦ UTRAN

IP RAN
◦ Packet Abis dan A over IP
◦ 3G Native IP
◦ LTE RAN

3. GSM Architecture & Interfaces
Abis interface PROPRIETARY
• 13 kb/s traffic channels
• up to 96 traffic channels / 2M frame
• one TRXSIG signalling channel / TRX
• one BCFSIG signalling channel / BTS
• 16, 32 or 64 kb/s signalling rates
Air
Interface
BTS
Abis
Interface
BSC
A interface OPEN
• 64 kb/s traffic channels
• 30 traffic channels / 2M frame
• 64 kb/s CCS#7 signalling
• 64 kb/s channels for X.25 NMS connection
Ater’
Interface
A
Interface
TC
MSC/VLR
TCSM
HLR/
AC/
EIR
Ater
Interface
Air interface OPEN
• 13 kb/s traffic channels
• 8 channels / TRX
• some channels reserved for signalling
• blocking
Ater interface PROPRIETARY
• 16 kb/s traffic channels
• up to 120 traffic channels / 2M frame
• 64 kb/s CCS#7 signalling
• 64 kb/s channels for X.25 NMS connection
• blocking

4. BTS1
bits
Ater’
Interface
A
Interface
Air
Interface
Abis
Interface
Ater
Interface
MSC
TC
SM
BSC
BTS2
BTS 1
1+1+1
BTS 2
1+1+1
BTS 3
2+2+
2
Max 12 TRX per 2 Mbit frame
GENERAL RULE for TS allocation
0 : Synchronization
1 - 24 : TCH
25 - 30 : TRX/BCF SIG
31 : Loop control
TS
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
3
4
5
6
7
8
Synchronisation
BTS 1
TRX 1
BTS 1
TRX 2
BTS 1
TRX 3
BTS 2
TRX 1
BTS 2
TRX 2
BTS 2
TRX 3
BTS 3
TRX 1
BTS 3
TRX 2
BTS 3
TRX 3
BTS 3
TRX 4
BTS 3
TRX 5
BTS 3
TRX 6
BTS 1 TRX 1 SIG
BTS 1 BCF SIG
BTS 1 TRX 3 SIG
BTS 2 TRX 1 SIG
BTS 2 TRX 2 SIG
BTS 3 TRX 1 SIG
BTS 1 TRX 2 SIG
BTS 2 TRX 3 SIG
BTS 3 BCF SIG
BTS 3 TRX 2 SIG
BTS 3 TRX 3 SIG
BTS 3 TRX 4 SIG
BTS 3 TRX 5 SIG
BTS 3 TRX 6 SIG
Loop bits / LCB / MCB
BTS 2 BCF SIG

5. 

Transmission equipment to branch data
streams between different link sets
Non-blocking stage
◦ Each input stream is routed to an output stream

Tasks
◦ Switching between link sets
◦ Switching between timeslots of a PCM trunk
◦ Dropping & inserting timeslots

6. Cross-Connects
Concentration
64 kbit/s
channels
n
3 x 2 Mbit/s
links
m
i < n+m+k
BSC
k
Total Traffic (Erl)
Blocking Prob.
1 x 2 Mbit/s
link
i = number of channels

7. Cross-Connects
Grooming
BSC
full 2 Mbit/s frames
not
full
2
Mbit/s
frames

8. 
Secara fungsi RAN dibagi menjadi 3 jenis
◦ GERAN (GSM EDGE Radio Access Network)
Jaringan Akses untuk GSM
◦ UTRAN (UMTS Teresterial Radio Access Network
Jaringan Akses untuk UMTS/WCDMA/3G
◦ E-UTRAN
Jaringan Akses untuk LTE/4G

9. GSM EDGE RADIO ACCESS
NETWORK

11. BSC
Packet Abis
MLPPP
E1/T1/FB
TDM
FlexiEDGE
TDM
Network
TDM
Packet Abis
MLPPP
E1/T1/SDH
◦ How
 Multiple E1 or T1 interfaces effectively provide a “virtual
common bandwidth” using MLPPP
 IP layer on top of ML/Multi Class PPP (MCPPP) and HDLC over
TDM (E1/T1)

12. BSC
Packet Abis
UDP/ IP
Ethernet
Packet Switched
Network
Eth
BTS
Eth
Packet Abis
UDP/ IP
Ethernet
◦ How
 L1 connectivity: options to bring Ethernet to the BTS sites
are:
 to use DSL connection
 to use Ethernet MW Radio for last mile
 to use fiber connection

13. RG20

BSC Site router with Layer 2 (Ethernet) and optional Layer 3
(IP) functionality required for packet network based
configurations for following purposes:
◦ Aggregation of site connectivity
◦ Flexible IP address planning and network configuration
◦ Router equipment redundancy based on Hot Standby Router
Protocol (HSRP)
A o IP
2G BTS
Packet Abis
IP Backbone
Network
MGW
HSRP
BSC
2G BTS
Gb o IP
Virtual Router
Redundancy
SGSN

14. UMTS RADIO ACCESS
NETWORK

16. 


Transport dari Node B ke RNC menggunakan 2 Teknologi transport ATM dan
Ethernet
IuB yang menggunakan ATM biasanya digunakan untuk layanan circuit
switching (voice,sms,mms)
IuB yang menggunakan tekhnologi ethernet digunakan untuk Data
NB
ATM
(TDM Network)
ATM
Aggregator
E1/T1
Eth
Ethernet
Leased line domain
RNC
STM1
Router

17. 

Menggunakan teknologi ATM untuk interface
IuB
Layanan suara dan data menggunakan
teknologi ATM, dipisahkan dengan virtual
path (VP) yang berbeda
NB
Eth
TDM
Transmission
RNC
ATM
Aggregator

18. 

Semua transport sudah menggunakan
teknologi IP Transport
Semua layanan baik suara maupun data
menggunakan teknologi packet switching
NB
Eth
Ethernet
RNC
IP Router

19. EVOLVED RADIO ACCESS
NETWORK