Methods and nodes for managing rstd reports

A method performed by a location server, the method comprising:

• transmitting NetWork assisted Reference Signal Time Difference, RSTD, Quantization Information, NW-QI, to a User Equipment, UE;
• receiving UE assisted RSTD Quantization Information, UE-QI, from the UE, including encoded RSTD measurements and further receiving RSTD measurements quality assessment report from the UE;
• decoding the RSTD quantized measurements using the UE-QI and/or the NW;
• and
• estimating a position of the UE based on the decoded RSTD quantized measurements.

A user equipment, UE, comprising a processor and a memory, said memory containing instructions executable by said processor whereby said UE is operative to:

• receive from a location server, NetWork assisted Reference Signal Time Difference, RSTD, Quantization Information, NW-QI;
• perform RSTD measurements by measuring or estimating a Time Of Arrival, TOA, of a Positioning Reference Signal, PRS, from respective base station of a plurality of base stations;
• encode the RSTD measurements by employing a Enhanced RSTD Quantization Method, E-QM, or by using the NW-QI while encoding the RSTD measurements;
• and
• send UE assisted RSTD Quantization Information, UE-QI, to the location server, the UE-QI including the encoded RSTD measurements.

A method performed by a location server comprising:

• transmitting NetWork assisted Reference Signal Time Difference, RSTD, Quantization Information, NW-QI, to a User Equipment, UE;
• receiving UE assisted RSTD Quantization Information, UE-QI, from the UE, including encoded RSTD measurements and further receiving RSTD measurements quality assessment report from the UE;
• decoding the RSTD quantized measurements using the UE-QI and/or the NW;
• and
• estimating position of the UE based on the decoded RSTD quantized measurements.

A location server comprising comprising a processor and a memory, said memory containing instructions executable by said processor whereby said location server is operative to:

• transmit NetWork assisted Reference Signal Time Difference, RSTD, Quantization Information, NW-QI, to a User Equipment, UE;
• receive UE assisted RSTD Quantization Information, UE-QI, from the UE, including encoded RSTD measurements and further receiving RSTD measurements quality assessment report from the UE;
• decode the RSTD quantized measurements using the UE-QI and/or the NW;
• and
• estimate a position of the UE based on the decoded RSTD quantized measurements.