Editing My 33.127 Notes (section)

== 7.3 Location of 7 Service layer based interception ==

From 3GPP TS 33.127 V16.0.0 (2019-06)

=== 7.3.4 Cell database information reporting ===

When a cell identity is provided for the target's location in IRI, the Communication Service Provider (CSP) may also provide Cell Supplemental Information (CSI) for the reported cell identity. The MDF2 may retrieve CSI by access to a CSP maintained database (referred to as CSP Cell Database) as shown in figure 7.3.4-1. When using CSI reporting and the CSP cannot deliver via IRI messages generated from the xIRI, the MDF2 shall generate a Cell Site Report (CSR) for location information specific to the cell identity reported.

The following information shall be delivered when CSI is provided in IRI or a MDF2 generated CSR:
* LIID.
* Cell identity.
* Date/time(s) established by MDF2.
* Cell supplemental information.

If CSI for a cell identity has been previously reported to the LEMF for the current interception, and if allowed by CSP-LEA mutual agreement, the CSP may not need to resend this specific CSI, unless it has changed.

If the CSP does not support CSR or CSI, the database can be provided by non-real-time means.