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TR 23.842 (SA2)
Study on network provided location information to the IMS

ToC   3GPP‑Page   Help    
V11.0.0 (Wzip)  2011/12  52 p.

Rapporteur:  Mr. Zarri, Michele
See also:  IMS-related TS/TR

This TR 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.


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1  ScopeWord-p. 6
2  References
3  Definitions and abbreviationsWord-p. 7
4  Scenarios for Network Provided Location Information Provision
5  Architecture RequirementsWord-p. 9
6  Architecture AlternativesWord-p. 11
6.1  HSS based NPLI retrieval based on existing mechanisms
6.2  Enhanced PS domain location reportingWord-p. 14
6.3  LCS based NPLI provision from MME to GMLCWord-p. 17
6.4  NPLI provision using EPS and PCC FrameworkWord-p. 23Up
6.6  Correlation of IMS and IP-CAN CDRs
6.8  NPLI via GTP-U request for non-Session based IMS
6.9  NPLI retrieval based on Intelligent Network exchange
6.10  2-phase solution
6A  Distribution of location information within the IMS
7  ConclusionsWord-p. 45
A  Analysis on the Operator Dependent Location InformationWord-p. 50
B  Change historyWord-p. 52

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