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LTE / HSPA / EPC knowledge nuggets
Connecting to the IMS
Connecting to the IMS
LTE / HSPA / EPC
‘knowledge nuggets’
Neil Wiffen - [email protected]
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LTE / HSPA / EPC knowledge nuggets
Connecting to the IMS
Network connectivity comparison
Circuit Switched
Core
Packet Switched
Core
BSC
Evolved Packet
Core (EPC)
RNC
BTS
NB
ENB
LTE
device
GSM
device
W-CDMA
TDMA
UMTS
device
GPRS
device
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OFDMA / SC-FDMA
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LTE / HSPA / EPC knowledge nuggets
Connecting to the IMS
R8 - Evolved Packet System
(LTE)
E-UTRA
EPC
S-GW
ENB
P-GW
HSS
External networks
and services
LTE-UE
E-UTRAN
MME
Service
Control
EPS
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LTE / HSPA / EPC knowledge nuggets
Connecting to the IMS
LTE / EPC Basic Architecture
PCRF
Gxc
Gx
X2 (C+U)
S5
S-GW
LTE-Uu
Rx
P-GW
SGi
External Networks
and Services
S1-U
S11
S8
S1-MME
MME
S6a
HSS
S10
Other PLMN
User data
MME
EPC
Control signalling
User Data and
Control signalling
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LTE / HSPA / EPC knowledge nuggets
Connecting to the IMS
Combined General Architecture (R8)
Um
Other
PCRF
S9
PCRF
Abis
BSC
Rx
External CS
Networks and
Services
A
Gb
A
Nb
MGW
MGW
Mc
RNC
Mc
Nc
MSC
Server
IuCS
Iur
IuCS
Uu
Iub
MSC
Server
D
F
C
EIR
Gs
RNC
Gx
HSS
Gf
Gx
Gc
Gi
Gr/S6d
IuPS
SGSN
Gn
S3
GGSN
IMS
Platform
Gxc
S13
SGs
External PS
Networks and
Services
S6a
P-GW
SGi
S5
X2
S4
MME
LTE-Uu
S-GW
S11
S1-MME
Other PLMN
S8
S10
S1-U
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MME
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LTE / HSPA / EPC knowledge nuggets
Connecting to the IMS
Connecting to IM CN (1)
15. Register with
IMS
13. Modify RBs
14. Establish GTP tunnel
10. Establish bearer
and GTP tunnel
SGW
1. Establish RBs
2. Register with CN &
request ‘PDN service’
12. Forward
connection
details
5. Accept
Registration
8. Request bearer and
tunnel establishment
7. Request
bearer
4. Authenticate SIM
and secure connection
11. Forward
connection
details
3. Retrieve
Security and
subscription
parameters
HSS
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9. Establish QoS
and charging
rules
PCRF
MME
6. Update
location
information
PGW
6
P-CSCF
IMS
Platform
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LTE / HSPA / EPC knowledge nuggets
Connecting to the IMS
Connecting to IM CN (2)
15. Connect to PDN
PDN
GTP tunnel
GTP tunnel
20. Establish bearer
and GTP tunnel
24. Establish GTP tunnel
SGW
23. Modify RBs
(2. Register with CN &
request ‘PDN service’)
16. Request ‘IMS
service’
17. Request
bearer
22. Forward
connection
21. Forward
details
connection
details
PGW
18. Request bearer and
tunnel establishment
19. Establish QoS
and charging rules
PCRF
MME
25. Register with
IMS
P-CSCF
IMS
Platform
HSS
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