User plane location services over session initiation protocol (SIP)
A method and mechanism to allow a location server to initiate a user plane location service (e.g., SUPL defined by OMA) procedure to a user plane enabled device via Instant Messaging, or alternatively, via an existing SIP session if a multimedia session is already established. The location request is signaled to the user plane enabled device via a SIP INFO message. The location request uses SIP messaging to overcome firewall and other network security issues. Location using SUPL over SIP may be provided about a caller making an E911 emergency call. An Instant Message may be sent to the user plane enabled device, e.g., a VoIP wireless phone.
1. A method for obtaining a location of a subscriber wireless device, comprising:
signaling, at a location server, a Secure User Plane for Location (SUPL) location request via an existing multimedia session initiation protocol (SIP) session established between said location server and a target wireless device via a physical presence server; and
retrieving, via a user plane location service session, location information associated with said target wireless device.
2. The method for obtaining a location of a subscriber wireless device according to claim 1 , further comprising:
initiating said user plane location service session via Extensible Messaging and Presence Protocol (XMPP) protocol.
3. The method for obtaining a location of a subscriber wireless device according to claim 1 , wherein:
said SUPL location request is signaled to said target wireless device via a SIP INFO message.
4. The method for obtaining a location of a subscriber wireless device according to claim 1 , wherein said signaling, at said location server, comprises:
transmitting a SIP message as said signaling, to overcome network security.
5. The method for obtaining a location of a subscriber wireless device according to claim 4 , wherein said network security comprises:
a firewall.
6. The method for obtaining a location of a subscriber wireless device according to claim 1 , further comprising:
receiving an emergency call from said target wireless device via Voice over Internet Protocol (VoIP).
7. The method for obtaining a location of a subscriber wireless device according to claim 1 , wherein said target wireless device comprises:
a voice over Internet Protocol (VoIP) phone.
8. The method for obtaining a location of a subscriber wireless device according to claim 1 , wherein:
said user plane location service session complies with a secure user plane for location (SUPL) standard defined by Open Mobile Alliance OMA-TS-ULP-V1 — 0-20060127-C.