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

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(W-zip) V11.0.0    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 Scope    2 References    3 Definitions and abbreviations    3.1 Definitions    3.2 Abbreviations    4 Scenarios for Network Provided Location Information Provision    4.1 Lawful interception    4.2 Charging    4.3 IMS Emergency Calls Routing    4.4 Retention of Location Information Data    4.5 Special Call Routing for Localised Services    4.6 Location-based service triggering    5 Architecture Requirements    5.1 General    5.2 High Level Requirements    5.3 Location Characteristics Requirements    5.4 Overview of IMS Functional Entities Requiring Location    6 Architecture Alternatives    6.1 HSS based NPLI retrieval based on existing mechanisms    6.2 Enhanced PS domain location reporting    6.3 LCS based NPLI provision from MME to GMLC    6.4 NPLI provision using EPS and PCC Framework    6.5 Void    6.6 Correlation of IMS and IP-CAN CDRs    6.7 Void    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    6A.1 Overview    6A.2 Example call flows    6A.3 Generation of the Geographical Identifier    7 Conclusions    7.1 Alternatives evaluation criteria and scoring    7.2 Specification work recommendation    A Analysis on the Operator Dependent Location Information    A.1 General    A.2 Use Cases    A.3 Analysis    B Change history   

 

1   Scope   Word-p. 6
2   References
3   Definitions and abbreviations   Word-p. 7
4   Scenarios for Network Provided Location Information Provision
5   Architecture Requirements   Word-p. 9
6   Architecture Alternatives   Word-p. 11
6.1   HSS based NPLI retrieval based on existing mechanisms
6.2   Enhanced PS domain location reporting   Word-p. 14
6.3   LCS based NPLI provision from MME to GMLC   Word-p. 17
6.4   NPLI provision using EPS and PCC Framework   Word-p. 23      Up
6.5   Void
6.6   Correlation of IMS and IP-CAN CDRs
6.7   Void
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   Conclusions   Word-p. 45
A   Analysis on the Operator Dependent Location Information   Word-p. 50
B   Change history   Word-p. 52

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