8.3 Information Exchange Initiation
25.4533GPPRelease 17TSUTRAN Iupc interface Positioning Calculation Application Part (PCAP) signalling
8.3.1 General
This procedure is used by a RNC to request the initiation of an information exchange with a SAS.
This procedure uses the signalling bearer connection for the Information Exchange Context.
8.3.2 Successful Operation
Figure 3: Information Exchange Initiation procedure, Successful Operation
The procedure is initiated with an INFORMATION EXCHANGE INITIATION REQUEST message sent from RNC to SAS.
If the Information Type IE is set to "Implicit", the SAS is responsible for selecting the type of assistance data.
Upon reception, the SAS shall provide the requested information according to the parameters given in the request. Unless specified below, the meaning of the parameters are given in other specifications.
If the Information Exchange Object Type IE is set to "Cell-ID Measured Results Sets" the SAS shall use the "Cell-ID Measured Results Info List" for obtaining an initial UE position estimate.
If the GANSS-UTRAN Time Relationship Uncertainty IE included in the INFORMATION EXCHANGE INITIATION REQUEST message does not contain the GANSS ID IE, the SAS shall assume that the GANSS-UTRAN Time Relationship Uncertainty IE is associated with "Galileo".
If the Information Type IE is set to "Explicit" and an Explicit Information Item IE is set to "GANSS Common Data", at least one of the GANSS Reference Time, GANSS Ionosphere Model, GANSS Reference Location, GANSS Additional Ionospheric Model, or GANSS Earth Orientation Parameters types shall be requested.
If the Information Type IE is set to "Explicit" and an Explicit Information Item IE is set to "GANSS Generic Data", at least one of the GANSS Real Time Integrity, GANSS Data Bit Assistance, DGANSS Corrections, GANSS Almanac and Satellite Health, GANSS Reference Measurement Information, GANSS UTC Model, GANSS Time Model GNSS-GNSS, GANSS Navigation Model, GANSS Additional Navigation Models, GANSS Additional UTC Models, GANSS Auxiliary Information, DBDS Corrections, or BDS Ionospheric Grid ModelRequest IEs shall be present in each GANSS Generic Data Item IE associated with a given GANSS.
– If the GANSS Generic Data Item IE does not contain the GANSS ID IE, the SAS shall assume that the corresponding GANSS is "Galileo".
Information Report Characteristics:
The Information Report Characteristics IE indicates how the reporting of the information shall be performed.
If the Information Report Characteristics IE is set to "On-Demand", the SAS shall report the requested information immediately.
If the Information Report Characteristics IE is set to "Periodic", the SAS shall report the requested information immediately and then shall periodically initiate the Information Reporting procedure for all the requested information, with the requested report frequency.
If the Information Report Characteristics IE is set to "On-Modification", the SAS shall report the requested information immediately if available. If the requested information is not available at the moment of receiving the INFORMATION EXCHANGE INITIATION REQUEST message, but expected to become available after some acquisition time, the SAS shall initiate the Information Reporting procedure when the requested information becomes available. The SAS shall then initiate the Information Reporting procedure in accordance to the following conditions:
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "Almanac and Satellite Health", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change in the toa or WNa parameter has occurred in almanac/health information for at least one visible satellite.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "UTC Model", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change in the tot or WNt parameter has occurred in the GPS UTC model.
– If the Transmission TOW Indicator IE is set to "requested", then the SAS shall include the GPS Transmission TOW IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "Ionospheric Model", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the GPS ionospheric model.
– If the Transmission TOW Indicator IE is set to "requested", then the SAS shall include the GPS Transmission TOW IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "Navigation Model", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the clock/ephemeris information for at least one visible satellite or in the list of visible satellites.
– If the Transmission TOW Indicator IE is set to "requested", then the SAS shall include the GPS Transmission TOW IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "DGPS Corrections", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the quality of the DGPS corrections information for at least one visible satellite or in the list of visible satellites.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "Reference Time", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the time-of-week assistance information for at least one visible satellite or in the list of visible satellites.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "Acquisition Assistance", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in acquisition assistance information for at least one visible satellite or in the list of visible satellites.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "Real Time Integrity", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the real-time integrity status of at least one visible satellite.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE includes "Almanac and Satellite Health SIB", the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in almanac/health information for at least one visible satellite.
– If the Transmission TOW Indicator IE is set to "requested", then the SAS shall include the GPS Transmission TOW IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Almanac and Satellite Health IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change in the Toa , IODa, or Week Number parameter has occurred in almanac/health information for at least one visible satellite.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS UTC Model IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change in the tot or WNt parameter has occurred in the GANSS UTC model.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Additional UTC Models IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change in the tot,WNot, WNt, or NA parameter has occurred in the GANSS Additional UTC model.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Common Data" and includes the GANSS Ionosphere Model IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the GANSS ionospheric model.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Common Data" and includes the GANSS Additional Ionospheric Model IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the GANSS additional ionospheric model.
– If the Data ID IE is set to value "11", then the SAS shall include the GANSS Additional Ionospheric Model IE for the area as defined in IS-QZSS [27]. If the Data ID IE is set to value "00", then the SAS shall include the GANSS Additional Ionospheric Model IE applicable worldwide as defined in IS-QZSS [27]. If the Data ID IE is set to value "01", then the SAS shall include the GANSS Additional Ionospheric Model IE for the area as defined in BDS-SIS-ICD [33].
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Common Data" and includes the GANSS Earth Orientation Parameters IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change in the tEOP parameter has occurred in the GANSS Earth Orientation Parameters.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Navigation Model IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the ephemeris information for at least one visible satellite or in the list of visible satellites.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Additional Navigation Models IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the ephemeris information for at least one visible satellite or in the list of visible satellites.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Time Model GNSS-GNSS IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the time information.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the DGANSS Corrections IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the quality of the DGANSS corrections information for at least one visible satellite or in the list of visible satellites.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the DBDS Corrections IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the quality of the DBDS corrections information for at least one visible satellite or in the list of visible satellites.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the BDS Ionospheric Grid Model Request IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the BDS ionospheric grid model.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Common Data" and includes the GANSS Reference Time IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the time-of-week assistance information for at least one visible satellite or in the list of visible satellites.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Reference Measurement Information IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in acquisition assistance information for at least one visible satellite or in the list of visible satellites.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Real Time Integrity IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change has occurred in the real-time integrity status of at least one visible satellite.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Auxiliary Information IE, the SAS shall initiate the Information Reporting procedure for this specific Explicit Information Type when a change in the Signals Available or Channel Number IEs has occurred in the GANSS Auxiliary Information.
– If the GANSS Time Indicator IE is set to "requested", then the SAS shall include the GANSS Reference Time IE in the INFORMATION REPORT message.
– If any of the above Information Type IEs becomes temporarily unavailable, the SAS shall initiate the Information Reporting procedure for this specific Information Item by indicating "Information Not Available" in the Requested Data Value Information IE. If the Information becomes available again, the SAS shall initiate the Information Reporting procedure for this specific Information.
If the IMSI IE, or IMEI IE is included in the INFORMATION EXCHANGE INITIATION REQUEST message, the SAS may save these IEs for use in location session correlation.
Response message:
If the SAS is able to determine the information requested by the RNC, it shall respond with the INFORMATION EXCHANGE INITIATION RESPONSE message. The message shall include the same Information Exchange ID that was included in the INFORMATION EXCHANGE INITIATION REQUEST message. When the Report Characteristics IE is set to "On Modification" or "Periodic", the INFORMATION EXCHANGE INITIATION RESPONSE message shall contain the Requested Data Value IE if the data are available. When the Report Characteristics IE is set to "On Demand", the INFORMATION EXCHANGE INITIATION RESPONSE message shall contain the Requested Data Value IE.
When the response message includes data to be reported (see above), the SAS shall include at least one IE in the Requested Data Value IE.
If the Requested Data Value IE contains the GANSS Common Assistance Data IE, at least one of the GANSS Reference Time, GANSS Ionospheric Model, GANSS Reference Location, GANSS Additional Ionospheric Model, or GANSS Earth Orientation Parameters IEs shall be present.
– If the GANSS Reference Time IE does not contain the GANSS Time ID IE, the corresponding GANSS timing refers to the "Galileo" timing.
Any GANSS Generic Assistance Data IE associated with a given GANSS included in the Requested Data Value IE shall contain at least one of the GANSS Real Time Integrity, GANSS Data Bit Assistance, DGANSS Corrections, GANSS Almanac and Satellite Health, GANSS Reference Measurement Information, GANSS UTC Model, GANSS Time Model, GANSS Navigation Model, GANSS Additional Time Models, GANSS Additional Navigation Models, GANSS Additional UTC Models, GANSS Auxiliary Information, DBDS Correction Information, or BDS Ionospheric Grid Model IEs.
– If the GANSS Generic Assistance Data IE does not contain the GANSS ID IE, the corresponding GANSS is "Galileo".
– The DGANSS Corrections IE contains one or several DGANSS Information IE(s), each of them associated with a GANSS Signal. A DGANSS Information IE for a particular GANSS that does not contain the GANSS Signal ID IE is by default associated with the default signal defined in TS 25.331 [4].
– The GANSS Real Time Integrity IE contains one or several Satellite Information IEs, each of them associated with a satellite and a GANSS Signal. A Satellite Information IE for a particular GANSS that does not contain the Bad GANSS Signal ID IE is by default associated with all the signals of the corresponding satellite (see OS SIS ICD [22], IS-GPS-200 [23], IS-GPS-705 [24], IS-GPS-800 [25], DTFA01-96-C-00025 [26], IS-QZSS [27], [28], BDS-SIS-ICD [33]).
– The GANSS Reference Measurement Information IE is associated with a GANSS Signal. A GANSS Reference Measurement Information IE for a particular GANSS that does not contain the GANSS Signal ID IE is by default associated with the default signal defined in TS 25.331 [4].
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Time Model GNSS-GNSS IE with exactly one bit set to value "1" in the GNSS-GNSS Time ext IE, the SAS shall include the GANSS Time Model IE in the Requested Data Value IE with the requested time information.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Generic Data" and includes the GANSS Time Model GNSS-GNSS IE with more than one bit set to value "1" in the GNSS-GNSS Time ext IE, the SAS shall include the GANSS Additional Time Models IE in Requested Data Value IE with the requested time information for each GANSS.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "DGPS Corrections", the SAS shall include the DGPS Corrections IE in Requested Data Value IE with the DGNSS Validity Period IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "DGANSS Corrections", the SAS shall include the DGANSS Corrections IE in Requested Data Value IE with the DGNSS Validity Period IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "Acquisition Assistance ", the SAS shall include the GPS Acquisition Assistance IE in Requested Data Value IE with the Azimuth and Elevation and Azimuth and Elevation LSB IEs included, if available, and with the Confidence IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "Almanac and Satellite Health", the SAS shall include the GPS Almanac and Satellite Health IE in Requested Data Value IE with the Complete Almanac Provided IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "Reference Time", the SAS shall include the GPS Reference Time IE in Requested Data Value IE with the GPS Week Cycle Number IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Almanac and Satellite Health", the SAS shall include the GANSS Almanac and Satellite Health IE in Requested Data Value IE with the Complete Almanac Provided IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Reference Measurement Information ", the SAS shall include the GANSS Reference Measurement Information IE in Requested Data Value IE with the Azimuth and Elevation and Azimuth and Elevation LSB IEs included, if available, and with the Confidence IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Reference Time", the SAS shall include the GANSS Reference Time IE in Requested Data Value IE with the GANSS Day Cycle Number IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "GANSS Time Model GNSS-GNSS", the SAS shall include the GANSS Time Model IE in Requested Data Value IE with the Delta_T IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "DBDS Corrections", the SAS shall include the DBDS Correction Information IE in Requested Data Value IE with the DBDS information IE included, if available.
If the Information Type IE is set to "Explicit" and the Explicit Information Item IE is set to "BDS Ionospheric Grid Model Request", the SAS shall include the BDS Ionospheric Grid Model IE in Requested Data Value IE, if available.
8.3.3 Unsuccessful Operation
Figure 4: Information Exchange Initiation procedure, Unsuccessful Operation
If the requested Information Type received in the Information Type IE indicates a type of information that SAS cannot provide, the SAS shall regard the Information Exchange Initiation procedure as failed.
If the requested information provision cannot be carried out, the SAS shall send the INFORMATION EXCHANGE INITIATION FAILURE message. The message shall include the same Information Exchange ID that was used in the INFORMATION EXCHANGE INITIATION REQUEST message and the Cause IE set to an appropriate value.
Typical cause values are as follows:
– Information temporarily not available;
– Information Provision not supported for the object;
– Processing Overload;
– Hardware Failure;
– O&M Intervention.
8.3.4 Abnormal Conditions
If the Information Exchange Object Type IE is set to "Reference Position" and the Information Type IE set to "Explicit" and the Explicit Information Item IE is set to "Reference Location" or "GANSS Reference Location" the SAS shall reject the Information Exchange Initiation procedure and shall send the INFORMATION EXCHANGE INITIATION FAILURE message.
The allowed combinations of the Information Type and Information Report Characteristics are shown in the table below marked with "X". For not allowed combinations, the SAS shall reject the Information Exchange Initiation procedure using the INFORMATION EXCHANGE INITIATION FAILURE message.
Table 3a: Allowed Information Type and Information Report Characteristics combinations
|
Type |
Information Report Characteristics Type |
||
|
On Demand |
Periodic |
On Modification |
|
|
Almanac and Satellite Health |
X |
X |
X |
|
UTC Model |
X |
X |
X |
|
Ionospheric Model |
X |
X |
X |
|
Navigation Model |
X |
X |
X |
|
DGPS Corrections |
X |
X |
X |
|
Reference Time |
X |
X |
X |
|
Acquisition Assistance |
X |
X |
X |
|
Real Time Integrity |
X |
X |
X |
|
Almanac and Satellite Health SIB |
X |
X |
X |
|
Reference Location |
X |
||
|
GANSS Reference Time |
X |
X |
X |
|
GANSS Ionosphere Model |
X |
X |
X |
|
GANSS Reference Location |
X |
||
|
GANSS Additional Ionospheric Model |
X |
X |
X |
|
GANSS Earth Orientation Parameters |
X |
X |
X |
|
GANSS Real Time Integrity |
X |
X |
X |
|
GANSS Data Bit Assistance |
X |
X |
|
|
DGANSS Corrections |
X |
X |
X |
|
GANSS Almanac and Satellite Health |
X |
X |
X |
|
GANSS Reference Measurement Information |
X |
X |
X |
|
GANSS UTC Model |
X |
X |
X |
|
GANSS Time Model GNSS-GNSS |
X |
X |
X |
|
GANSS Navigation Model |
X |
X |
X |
|
GANSS Additional Navigation Models |
X |
X |
X |
|
GANSS Additional UTC Models |
X |
X |
X |
|
GANSS Auxiliary Information |
X |
X |
X |
|
BDS Ionospheric Grid Model |
X |
X |
X |
|
DBDS Corrections |
X |
X |
X |