Transcript IP Connectivity for Emergency Calls in HRPD/PDS Networks

IP Connectivity for E911 in
HRPD/PDS Networks
Page 1
IP Connectivity for Emergency
Calls in HRPD/PDS Networks
3GPP2 Meeting, 12/06
IP Connectivity for E911 in
HRPD/PDS Networks
Page 2
IP Connectivity for Emergency
Calls in HRPD/PDS Networks
QUALCOMM Inc.
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Overview
IP Connectivity for E911 in
HRPD/PDS Networks
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• Briefly describe 3GPP’s solution on conditional
Emergency Services IMS Registration
• Highlight a key difference between 3GPP and 3GPP2
on the issue of IMS to IP binding
• Discuss some issues for 3GPP2
• Propose a 3GPP2 solution
3GPP Overview
IP Connectivity for E911 in
HRPD/PDS Networks
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• The only case when the UE should perform an additional
emergency services IMS registration when it is already IMS
registered is as follows:
• If the UE knows it is roaming outside the home network, but is connected to
a GGSN, and hence a P-CSCF, in the home network
• In this case, the UE has a to perform the following steps:
• Obtain IP connectivity via a GGSN in the visited network
• Discovery a P-CSCF in that network
• Perform another IMS registration with a *special* emergency Public URI
– The *special* emergency URI is needed because of the limitation in IMS
Rel 5/6/7, where for a given private id there can only be a single IMS
registration
IMS/MMD Technical Differences
IP Connectivity for E911 in
HRPD/PDS Networks
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Proxy-CSCF & PDSN/GGSN location
•
•
In 3GPP IMS, the GGSN (Gateway GPRS Support
Node) and P-CSCF are co-located in the same network
In 3GPP2 MMD, the PDSN (Packet data Serving Node)
and P-CSCF may be located in different networks
– E.g., The PDSN may be in the visited and the PCSCF may be in the home network
Technical Considerations for 3GPP2
IP Connectivity for E911 in
HRPD/PDS Networks
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• In 3GPP2 networks the MS does not always
know it is roaming
•
A solution is proposed for MMD
• MMD Roaming is not yet defined
• When to use a P-CSCF in the home or visited is all TBD
• A multitude of IP options exist
•
•
•
Simple IP vs. Mobile IP
IPv4 vs. IPv6
L2TP
Proposed 3GPP2 Solution
IP Connectivity for E911 in
HRPD/PDS Networks
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• Mobile accesses HRPD/PDS network
• MS determines if it’s roaming via carrier-ID attribute (received
via DHCP)
• Carrier ID = Mobile Country Code (MCC) + IMSI_11_12 (unique per operator)
– As an alternative the can MS provides SectorID in serving network to home
P-CSCF, which in turn indicates to MS if it’s roaming or not based on
SectorID
• If the MS is not roaming, it accesses emergency services
through its normal (home) P-CSCF IMS registration
• If the MS is roaming but using a local P-CSCF, it accesses
emergency services through its visited network P-CSCF IMS
registration
• If the MS is roaming but the P-CSCF is in the home network
then after an emergency call is placed, the UE
• Obtains a SIPv6 address
• IMS registers it via the local (visited) P-CSCF
Simple IPv6 Justification
IP Connectivity for E911 in
HRPD/PDS Networks
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Mobile IPv4 and Mobile IPv6 are not appropriate
for emergency access when roaming.
•
•
If HA is in the home network, then all packets are
tunneled back to the home network.
HA assignment in the visited network may not be
supported or authorized.
Simple IPv4 is not appropriate for emergency
access when roaming.
• If L2TP is used with the Simple IPv4 address, all
•
packets will be routed to the home operator network.
MS is assigned with one Simple IPv4 address and is
unaware of L2TP.