The report process is initiated when a DF determines a Cell Identity is contained in an IRI event and when location reporting is authorized.
If the specific Cell supplemental information has not been sent for the interception in the IRI event, the DFs reporting process will produce a report called CSR for the Cell Identity reported in the IRI and forward this report to the LEA.
If the Cell supplemental information for the current Cell Identity has been previously sent for the interception, based on operator policy, the CSR delivery process shall be able to assume that the LEA has retained the Cell supplemental information and not resend this Cell supplemental information. When the Cell Identity changes, during the session for whatever reason, and this new cell supplemental information has changed from what was previously sent for the interception, the new Cell site information shall be reported in the location parameter of the new IRI event or a new CSR report based on operator policy will be sent to the LEMF.
The LI_CELL_INFO interface is implementation specific between the DF2 and the source(s) of operator's cell site information regarding the PLMN. The source(s) of this cell site information may be consulted to produce the CSR. The details of this interface are outside the scope of this specification.
Once the Cell site is identified and operator specific cell site information source(s) consulted the DF shall add appropriate cell location related elements within the database to the location parameter in the IRI event or provide the CSR. Once a Cell site is reported during a LI, the operator shall be able to assume that the LEA will retain the Cell site reports for the duration of the LI reportable session and redundant reports may be suppressed based on operator policy. The following parameters in Table 22.4.1 are considered as a high level view of information that can be reported as an example of a report to be sent to the MF/DF.