F.2 UE measurement reports

25.1723GPPRelease 17Requirements for support of Assisted Galileo and Additional Navigation Satellite Systems (A-GANSS) Frequency Division Duplex (FDD)TS

In case of UE-assisted A-GANSS, the measurement parameters are contained in the RRC UE POSITIONING GANSS MEASURED RESULTS IE (subclause 10.3.7.93a in 3GPP TS 25.331 [14]). In case the UE provides also measurements on the GPS L1 C/A signal, the measurement parameters are contained in the RRC UE POSITIONING GPS MEASURED RESULTS IE (subclause 10.3.7.93 in 3GPP TS 25.331 [14]). The measurement parameters required for calculating the UE position are:

1) Reference Time: The UE has two choices for the Reference Time:

a) "UE GANSS Timing of Cell Frames" and/or "UE GPS Timing of Cell Frames";

b) "GANSS TOD msec" and/or "GPS TOW msec" if GPS L1 C/A signal measurements are also provided.

NOTE: It is not expected that an UE will ever report both a GANSS TOD and a GPS TOW. However if two time stamps are provided and they derive from different user times, be aware that no compensation is made for this difference and this could affect the location accuracy.

2) Measurement Parameters for each GANSS and GANSS Signal: 1 to <maxGANSSSat>:

a) "Satellite ID"; mapping according to table 10.3.7.88b in 3GPP TS 25.331 [14];

b) "GANSS Code Phase";

c) "GANSS Integer Code Phase";

d) "GANSS Integer Code Phase Extension";

e) "Code Phase RMS Error";

3) Additional Measurement Parameters in case of GPS L1 C/A signal measurements are also provided: 1 to <maxSat>:

a) "Satellite ID (SV PRN)";

b) "Whole GPS chips";

c) "Fractional GPS Chips";

d) "Pseudorange RMS Error".

Additional information required at the system simulator:

1) "UE Positioning GANSS Reference UE Position" or "UE Positioning GPS Reference UE Position" (subclause 10.3.8.4c in 3GPP TS 25.331 [14]):
Used for initial approximate receiver coordinates.

2) "UE Positioning GANSS Navigation Model" and "UE Positioning GANSS Additional Navigation Models" (subclauses 10.3.7.94a and 10.3.7.94b in 3GPP TS 25.331 [14]):
Contains the ephemeris and clock correction parameters as specified in the relevant ICD of each supported GANSS; used for calculating the satellite positions and clock corrections.

3) "UE Positioning GANSS Ionospheric Model" (subclause 10.3.7.92a in 3GPP TS 25.331 [14]):
Contains the ionospheric parameters which allow the single frequency user to utilize the ionospheric model as specified in [7] for computation of the ionospheric delay.

4) "UE Positioning GANSS Additional Ionospheric Model" (subclause 10.3.7.92b in 3GPP TS 25.331 [14]):
Contains the ionospheric parameters which allow the single frequency user to utilize the ionospheric model as specified in [6] for computation of the ionospheric delay.

5) "UE Positioning GANSS Time Model" (subclause 10.3.7.97a in 3GPP TS 25.331 [14]):
Contains the GNSS-GNSS Time Offset for each supported GANSS. Note, that "UE Positioning GANSS Time Model" IE contains only the sub-ms part of the offset. Any potential integer seconds offset may be obtained from "UE Positioning GPS UTC Model" (subclause 10.3.7.97 in 3GPP TS 25.331 [14]), "UE Positioning GANSS UTC Model" (subclause 10.3.7.97c in 3GPP TS 25.331 [14]), or "UE Positioning GANSS Additional UTC Models" (subclause 10.3.7.97d in 3GPP TS 25.331 [14]).

6) "UE Positioning GPS Navigation Model" (subclause 10.3.7.94 in 3GPP TS 25.331 [14]):
Contains the GPS ephemeris and clock correction parameters as specified in [3]; used for calculating the GPS satellite positions and clock corrections in case of GPS L1 C/A signal measurements are the only GPS measurements provided in addition to GANSS measurements.

7) "UE Positioning GPS Ionospheric Model" (subclause 10.3.7.92 in 3GPP TS 25.331 [14]):
Contains the ionospheric parameters which allow the single frequency user to utilize the ionospheric model as specified in [3] for computation of the ionospheric delay.