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3GPP2 All IP Emergency CallsSDO Emergency Services Coordination Workshop
Washington DC 10-12 April, 2007
Kirk [email protected]
QUALCOMM
10 April 2007 2
Presentation Overview
– 3GPP2 / 3GPP Alignment
– Stage 1 – Requirements
– Stage 2 – Architecture / Call Flows
– Stage 3 – Protocol
– Summary
10 April 2007 3
3GPP2 / 3GPP Alignment
– 3GPP2’s IMS Core Network specifications are based on 3GPP’s IMS Core Network specifications
• This is true in general and not just for emergency services
– For emergency services, there are some differences, mainly due to access network differences
• 3GPP2 covers IP-Based emergency calls originated from 3GPP2 associated wireless networks (HRPD and WLAN) whereas 3GPP also covers calls from ETSI TISPAN defined fixed broadband networks
• How the Endpoint determines it is roaming– Broadcast MCC/MNC in 3GPP vs DHCP in 3GPP2
• How unauthorized endpoints get access to the network
10 April 2007 4
Stage 1 - Requirements
– S.R0115 All IP-Network Emergency Call Support• http://www.3gpp2.org/Public_html/specs/S.R0115-0%20v1.0_060914.pdf
– S.R0115 (revision 1.1) recently updated to add support for the following:
• Support for Non-authorized mobiles
• Anonymous call support– A regional requirement (e.g. Japan: prefix 184 before
emergency number 119)
10 April 2007 5
Stage 2 – Architecture / Call Flows
– X.P0049 “Multi-Media Domain (MMD) Emergency Call Support”
• Draft is available in the projects folder:– ftp://ftp.3gpp2.org/TSGX/Projects - under the X.P0049 folder
• Based on 3GPP’s Stage 2, TS 23.167 “IP based IP Multimedia Subsystem (IMS) emergency sessions; Stage 2”
• Same architecture as 3GPP – when roaming, call is handled entirely in the visited network.
• While X.P0049 is a Stage 2 specification for IMS Core Network, it will also contain annexes for HRPD/PDS and WLAN access network procedures
– HRPD / PDS details in progress
– WLAN work yet to begin
10 April 2007 6
IMS Emergency Call Architecture
BGCF: Breakout Gateway Control FunctionCSCF: Call Session Control FunctionE-CSCF: Emergency CSCFLRF: Location Routing FunctionMGCF: Media Gateway Control FunctionP-CSCF: Proxy CSCFS-CSCF: Serving CSCFSUPL: Secure User Plane LocationUE: User Endpoint* LRF – Location may be obtained using OMA
SUPL
Ml
to PSAP (via PSTNvia BGCF/
MGCF)
to PSAP or ECS via IP mutimedia
Network
UE P-CSCF E-CSCFGm Mw
Mi/Mg
Mm
S-CSCFMm/Mw
Mw
from PSAP
Le (e.g. E2)
from PSAP*LRF
10 April 2007 7
Stage 3 Protocols
– X.P0013-004 “All IP Core Network Multimedia Domain”
• Based on 3GPP’s Stage 3, TS 24.229 “IMS call control based on SIP/SDP”
• Will be part of X.P0013-004 Rev. C
• Effort started Feb. 2007
– C.S0024 Rev. B - HRPD access network enhancements are complete:
• Emergency call indicator in HRPD session request
10 April 2007 8
HRPD / PDS Details
– 3GPP2 allows a wide range of packet data options
• Simple IP or Mobile IP
• IPv4 or IPv6
– Different packet data scenarios
• Scenario 1: Endpoint powers up (Non-Authorized Mobile)
• Scenario 2: Endpoint already has a Simple IP (v4 or v6) session
• Scenario 3: Endpoint already has a Mobile IPv4 session
• Scenario 4: Endpoint already has a Mobile IPv6 session
10 April 2007 9
Non-Authorized Mobile
PDSN
Host Network
2. Request data connection(emergency)
3. A12: CHAP auth( emergency NAI)
4. A11: A10 connection
6. Get IP Addr
1. Session Negotiation
14: Authorize Session (CN IPaddr)
PCRFHRPD RAN AAA
16. Vocoded Speech
UE P/E-CSCF
8. Get P-CSCF Identity
10. Data(INVITE( SDP ))11. SIP: INVITE( SDP )
12. SIP: 180 Ringing(SDP)13. Data(180 Ringing(SDP))
15. SIP: Complete SIP session establishment
17. SIP session ends
18. Unauthorize CN - IPaddr
5. CHAP auth( emergency NAI)
9. Session Established
7. VoIP Bearer Path Established
10 April 2007 10
Mobile IP Access
PDSN
Visited Network
2. Request local IPaddr
PCRFHRPD RAN
AAA
UE P/E-CSCF
3. Return local IPadd
8. SIP: INVITE( SDP )
11. SIP: 180 Ringing(SDP)
12. SIP: Complete SIP session establishment
14. SIP session ends
PDSN PCRF IMS
Home Network
1. Existing HRPD MIP Session, local Carrier and local P-CSCF known to UE
4. SIP: REGISTER( ePUID)
5. SIP: REGISTER( ePUID)
6. SIP: 200 OK7. SIP: 200 OK
13. Vocoded Speech
9. SIP: INVITE( SDP )
10. SIP: 180 Ringing(SDP)
10 April 2007 11
Summary
– 3GPP and 3GPP2 solutions are mostly aligned except for the access network related differences elaborated in slide #3
– 3GPP2 would like to work cooperatively with other groups to achieve global solutions.
– Thank you!
10 April 2007 12
Acronyms
DHCP – Dynamic Host Configuration Protocol
HRPD – High Rate Packet Data (3GPP2 access technology)
IMS – IP Multimedia Subsystem
MCC/MNC – Mobile Country Code/Mobile Network Code
MMD – Multi-Media Domain – 3GPP2 architecture that includes the IMS Core Network plus Packet Data Subsystem
PDS – Packet Data Subsystem
WLAN – Wireless Local Area Network
