BSNL 3G Roll Out
Rajeev Bansal
DGM (GSM & 3G), ALTTC, Ghaziabad
3GPP Network Reference Model
UE
AN
CN
MSC-S
MSC
MSC
SIM
SIM
Um
MT
MT
BTS
MGW
MSC
MSC
Gb
RNC
Iu
Iur
Cu ME Uu
USIM
USIM
ME
BS
RNS
Iub
H
SMS-SC
AUC
AUC
F
Gf
SGSN
SGSN
Gd,
Gp,
Gn+
Gr
SMSSMSGMSC
GMSC
SMSSMSIWMSC
IWMSC
Gn+
ISDN
PSTN
PSPDN
CSPDN
PDN:
-Intranet
-Extranet
-Internet
GGSN
GGSN
RNC
SGSN
SGSN
UTRAN
D
HLR
HLR
EIR
EIR
BS
GMSC
GMSC
A
BSC
Iu
Cu ME Uu
USIM
USIM
ME
SCF
SCF
E,
G
BSS
Abis
RNS
Iub
External
Networks
Note:
Not all interfaces
are shown and named
Primary Sites Vs Secondary Sites
•Primary Site is the highest level site in the core network.
– Contains nodes, both controlling and switching nodes for CS and
PS respectively as well as BSC access nodes.
– MSC-S, M-MGw, SGSN, BSC nodes.
•Secondary Site are sites with local switching capability and RAN
access.
– M-MGw and BSC nodes.
Primary Sites Vs Secondary Sites
Monolithic vs Layered Architecture
Monolithic vs Layered Architecture
MSC
MSC-S
MGW
Migration from Monolithic to
Layered architecture
MSC
Server
MSC
(Monolithic)
GCP / SIGTRAN
MGW
Call Control
Bearer
Design Principle
Control Signaling between MSC-S and M-MGw is using SS7
over IP (SIGTRAN)
BSC is connected to one M-MGw only
Each monolithic MSC is connected to SGw over TDM
Signaling between Monolithic MSC and MSC-S will be via SGw.
Design Principle
BICC
MSC-S
SIGTRAN
MGW
TDM
MSC
Monolithic MSC
MSC-S
Transport Design
Design Criteria:
􀂃 Up to 6 Node-Bs grouped into one cluster of a Sub-hub
􀂃 Up to 4 Sub-Hub clusters grouped into 1 hub.
􀂃 STM-1 from Hub/Sub-Hub to RNC through BSNL media
Interfaces:
􀂃 End node-B: E1 interface.
􀂃 Sub-Hub: E1 interface / STM-1 interface.
􀂃 Hub: STM-1 interface.
Hub- Sub-HUB Architecture
Requirement from BSNL
3E1 for Each Node B sites.
STM-1 between RNC and Hub RBS site
STM-1 between Hub RBS and Sub Hub RBS sites as
STM-1 between RNC and Core network.
Pool of IPs for O&M Purposes and GTPU Links (RNC to SGSN)
– 16 IP per node-B
– 64 IPs per RNC
128 IPs for OSS
Separate IMSI series for USIM
STM from Every Circle to ViG
Video Gateway (ViG)
􀂃 Video Gateway (ViG) interconnects WCDMA core network on
one side and an IP network on other. It supports, IP-based Video
Messaging systems and Multiparty Conferencing Systems
􀂃
Proposed ViG offers following services:
– Mobile to Mobile Video Calls
– Mobile to IP client (PC) video calls.
– Circuit Switched Streaming
– Multi-party Video Conferencing
ViG: Basic Connectivity
• Used for Mobile to PC and PC to Mobile Video Calls
• Video Conferencing
Key Services being offered
•􀂃 Mobile to Mobile Video Call
•􀂃 Mobile Broadband (High Speed Data)
•􀂃 Video Streaming (Clips/Movies etc.)
•􀂃 Mobile TV (Live TV Channels)