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8/3/2019 2G 3G Inter Operability Principle
1/12
Nov 30th, 2005
2G/3G
Inter-Operability
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ZXWR RNC
ZXWN MGW
ZXWN MSCS
ZXWN HLR
ZXWN GGSNZXWN SGSN
ZXWR NodeB
Internet
Java Streaming
Router
WAP Portal
DST Backbone
2G PS (SGSN/GGSN)
2G MSC
2G HLR
2G SMSC
Network Topology
DST WAPGateway
2G MMSZXWN SMSC
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SMS Inter-Operability
RNC
NodeB
MSCS
MGW
BTS
BSC
2G MSC
DST 2GSMSC
SMS GW
ZTE 3GSMSC
1. ZTE is proposing a dedicated 3G
SMSC.
2. 3G MSCS connects with 2G SMSC
and HLR through 2G MSC, 2G MSC
working as STP.
3. 3G trial user is allowed to send SMS
to another 3G trial user or DST 2G user.
4. 3G trial user is not allowed to send
SMS to any other PLMN network, both
international and domestic. ZTE 3G
SMSC will not forward the SMS to
SMS GW and will send failure notice
to 3G trial user.
5. All MO SMS of 3G users must be
through 3G SMSC, even when 3G user
is roaming in DST 2G network.
3G HLR2G HLR
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SMS Inter-Op: Configuration Needed
DST SMSC/HLR/MSC Configuration Parameter
Parameter Data
3G MSC GT 6738996000
3G HLR GT 6738994000
3G MSISDN NUM 6738990
3G MCC 528
3G MNC 09
3G SMSC GT 6738796000
DST HLR
MSC Server
MGW
RNS
DST MSC
DST SMSC
3G HLR
BSS
3G SMSC
Physical connection
Logical connection
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SMS Inter-Operability
By ZTE: By DST1) To provide engineering plan for
implementing ZTE 3G SMSC.
2) To install ZTE 3G SMSC equipment.
3) To provide ZTE SMSC HLR/MSC
configuration parameter (if change).
3) To provide DST SMSC/HLR/MSC
configuration parameter (if change).
4) To implement the connection, configure parameters such as MSC GT, HLR GT,
MCC, MNC, MSISDN NUM (if change). To finish testing and debugging.
a) test SMS between 3G user and 2G user.b) test SMS between 3G user and 3G roaming user.
c) test SMS between 2G user and 3G roaming user.
d) test SMS between 3G roaming users.
Implementation: Step by Step
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MMS Inter-Operability
UE:10.10.X.X
3G GGSN: 192.168.8.250
ZTE FW IP A:192.168.8.249Security Level=100(High)
ZTE FW IP B:172.1.1.1(suppose)Security Level=50(Middle)
DST FW IP C:172.1.1.2 (suppose)
DST FW IP D:172.2.1.1 (suppose)
WAP GW:172.2.1.2 (suppose)
MMSC:172.2.1.3(suppose)
Router:202.152.64.28
A B:DefaultB A:ZTE Configure
3G GGSN3G SGSN
Internet
RNC
ZXWR NodeB
ZTE FireWall
DST WAPGateway
DST MMSC
2G SGSN 2G GGSN
DST Firewall
ZTE Router
IP BIP
A
IP
D
IP
C
2G SMSC
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Mobile data networkMobile data network
3G GGSN
3G SGSN
WAP Gateway
MMS Flow
3G UE
2G GGSN
2G SGSN
2G SMSC
MMSC
2G MSC
1.1. WSP/HTTP POST
3G Roaming UE
Or 2G MS
1.2. WAP PUSH
1.3. WSP/HTTP
GET
1. 3G trial user is allowed to
send MMS to another 3G
trial user or DST 2G user.
2. As indicated by the red
lines, all WAP Push
messages to 2G and 3Gusers must be through 2G
SMSC.
3G MSCS
2.2. WAP PUSH
2.1. WSP/HTTP POST
2.3. WSP/HTTP GET
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The distance between ZTE Firewall and DST Firewall If distance
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MMS Inter-Operability
By ZTE: By DST1) To finish physical connection between 2G PS firewall with 3G PS firewall.
2) To provide IP address of 2G PS firewall (IP C) and ZTE firewall (IP B), and
implement the connection.
3) To provide ZTE HLR/MSC/Firewallconfiguration parameter.
3) To provide DSTSMSC/MMSC/HLR/MSC/Firewall/WAP
GW configuration parameter.
4) To implement the connection, configure parameters such as 2G SMSC GT, MMSC
IP, UE IP, SGSN IP, GGSN IP, Firewall IP, MSC GT, HLR GT. Then finish testing and
debugging. All WAP push messages are sent by 2G SMSC.a) test MMS between 3G user and 2G user.
b) test MMS between 3G user and 3G roaming user.
c) test MMS between 2G user and 3G roaming user.
d) test MMS between 3G roaming users.
Implementation: Step by Step
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ZXWR RNC
ZXWN MGW ZXWN MSCS
ZXWN HLR
ZXWR NodeBSelibajawan/20
2G MSC
2G HLR
E1 connection
between 2G and 3G
Phase I: To implement 3G->2G by PLMN selection
3G subscribers roam to 2G network by PLMN selection. The
process takes about 1~3 minutes.Phase II: To implement 3G->2G by cell re-selection
3G subscribers can roam to 2G network by 3G->2G cell re-
selection. The process takes about 15~30 seconds.
2G/3G Inter-Operability: Roaming
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Implementation: Step by Step (Phase I)
2G/3G Roaming Phase IBy ZTE By DST1 To confirm the staff that participate in the connection testing and debugging. To
confirm the schedule.
2 To confirm physical connection between ZTE and Alcatelusing the existing E1between 3G MGW and 2G SSP
3 To provide connection parameter with each other.
4) To implement the connection, finishtesting and debugging.
a) for 3G user roaming to 2Gnetwork: finish GT translation in 3G
HLR.b) for 3G roaming user receiving acall: finish call number analysis andGT translation.
4To implement the connection, finishtesting and debugging..
a) 3G IMSI analysis and GT translationin 2G MSCVLR: to implement 3G user
roaming to 2G network.b) when 3G roaming user receive acall, 2G MSC should makeconfiguration to connect the call.
c) when 3G roaming user originate acall, 2G MSC should route the call
accordingly and control the call barringto other network.
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2G/3G Roaming Phase II
By ZTE: By DST1) To confirm the edge of 3G coverage area. And to confirm the 2G cells number
which are at the edge of 3G coverage area.
2) To provide 2G cell information which
are at the edge of 3G coverage area.
3) To test 3G->2G cell re-selection (one cell).
4) To test and finish 3G->2G cell re-selection (the whole network).
Implementation: Step by Step (Phase II)
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