G.2 Relative Phase Error Measurement
38.101-13GPPNRPart 1: Range 1 StandaloneRelease 17TSUser Equipment (UE) radio transmission and reception
Here are listed the different aspects that may lead to different interpretations.
G.2.1 Symbols used
Phase error is determined based on DMRS REs (3 DMRS symbols per slot).
G.2.2 CFO (carrier frequency offset) correction
The TE performs a CFO correction on a slot-by-slot basis using a common frequency correction at the two uplink antenna connectors.
G.2.3 Steps of the measurement method
Below are detailed the steps necessary to obtain the maximum difference of relative phase error during the 20ms time window.
1 Determination for each subcarrier and at each antenna, the SRS relative phase error based on the last SRS transmitted on Ant1 and Ant2, that relative phase error serves as a reference for the calculation of the difference of relative phase error for each slot inside the 20 ms time window.
The output is the “SRS relative phase error” vector for the last SRS transmitted: .
2 Calculation for the last SRS transmitted, for each RB of the SRS relative phase errors based on the arithmetic mean of the subcarrier SRS relative phase errors determined in previous step.
The output is the “SRS relative phase error” vector for the last SRS transmitted: .
3 CFO correction on slot-by-slot basis using a common frequency correction for both antenna outputs.
4 Determination for each subcarrier and at each antenna, the phase over the slot being analyzed. The phase is extracted from the channel estimate derived from the 3 DMRS symbols of the slot using the LSE technique.
The output is one vector of dimension for each antenna.
5 Calculation for a slot for each subcarrier of the relative phase error (difference between the vectors determined in the previous step).
The output is subcarrier relative phase errors of a slot: .
6 Calculation for a slot, for each RB of the relative phase errors based on the arithmetic mean of the subcarrier relative phase errors determined in previous step.
The output is a “slot relative phase error” vector for a slot:.
7 Calculation for a slot of the difference of relative phase errors based on the “SRS relative phase error” (reference) determined in step 2 and the “slot relative phase error” determined in previous step.
The output is a “difference of relative phase error” vector for a slot:.
8 Calculation for a slot of the arithmetic mean value of the “difference of relative phase error” vector determined in previous step, this value corresponds to an RB.
The output is a “difference of relative phase error” value for a slot:
9 Perform for each slot of the 20ms time window, steps 3 to 8.
The output is a “difference of relative phase error” vector: .
10 Calculation of the maximum value of the “difference of relative phase error”.
The output is the “difference of relative phase error” that should be verified as complying with the 40° maximum allowable difference of relative phase error requirement: .
Annex H (informative): Void
Annex I (informative): Void
Annex J (informative): Void
Annex K (informative): Void
Annex L (normative):
ModifiedMPR-Behavior