Study on network provided location information to the IP Multimedia Subsystem (IMS)
The present document investigates architecture solutions for making the Network Provided Location Information (NPLI) related to the access network that the UE is camped on available to the IMS nodes whenever the IMS operator needs to record this information either to fulfil legal obligations, for charging or for other purposes.
This study will gather the various existing regulatory and operator requirements that the solution needs to fulfil, in particular:
- whether the provision of the Network Provided Location (NPLI) Information and local time are applicable to all the users served by a network (i.e. "non-roaming" subscribers and inbound roamers) or only to the network operator subscribers;
- whether Network Provided Location (NPLI) and local time need to be made available also if EPS/GPRS and IMS services of a subscriber are provided by different networks;
- what events trigger the need to retrieve the Network Provided Location (NPLI) and local time.
The study is then expected to produce solution candidates which detail the necessary Stage 2 message flows, architecture enhancements and new functionality needed in the EPS and GPRS networks. The solution candidates will also describe what IP Multimedia Subsystem elements are affected in order to obtain the Network Provided Location (NPLI).
The solutions produced will then be assessed against the criteria identified in section 7 where recommendations for normative work will also be made.