IP Connectivity for E911 in HRPD/PDS Networks Page 1 IP Connectivity for Emergency Calls in HRPD/PDS...

IP Connectivity for E911 in HRPD/PDS Networks

IP Connectivity for Emergency

Calls in HRPD/PDS Networks 3GPP2 Meeting, 1/07

IP Connectivity for Emergency

Calls in HRPD/PDS Networks 3GPP2 Meeting, 1/07


IP Connectivity for EmergencyCalls in HRPD/PDS Networks

QUALCOMM Inc.

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Overview

• 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

• The only case when the UE should perform an additional emergency 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 to perform the following steps:• Obtain IP connectivity via a GGSN in the visited network

• Discover 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

Proxy-CSCF & PDSN/GGSN location• In 3GPP IMS, the GGSN and P-CSCF are always co-

located in the same network

• In 3GPP2 MMD, the PDSN and P-CSCF may be located in different networks

– E.g., The PDSN may be in the visited and the P-CSCF may be in the home network


Technical Considerations for 3GPP2

• 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

• 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)

• If the MS is not roaming, it accesses emergency services through its normal (home) P-CSCF registration• If the MS is roaming but is using a local P-CSCF, it accesses emergency services through its visited network P-CSCF registration• If the MS is roaming but the P-CSCF is in the home network then after an emergency call is dialed, the UE

• Obtains a SIPv6 address• Registers via the local (visited) P-CSCF – For authorized mobiles anyway


Simple IPv6 Justification

•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

IP Connectivity for E911 in HRPD/PDS Networks Page 1 IP Connectivity for Emergency Calls in HRPD/PDS...

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