6.4G Transmit signal quality for Tx Diversity

38.101-13GPPNRPart 1: Range 1 StandaloneRelease 17TSUser Equipment (UE) radio transmission and reception

6.4G.1 Frequency error for Tx Diversity

For UE(s) supporting Tx diversity, the basic measurement interval of modulated carrier frequency is 1 UL slot. The mean value of basic measurements of UE modulated carrier frequency at each transmit antenna connector shall be accurate to within ± 0.1 PPM observed over a period of 1 ms of cumulated measurement intervals compared to the carrier frequency received from the NR Node B.

6.4G.2 Transmit modulation quality for Tx Diversity

6.4G.2.0 General

For UE supporting Tx diversity, the transmit modulation quality requirements are specified based on measurements made at each transmit antenna connector. The transmit modulation quality is specified in terms of:

– Error Vector Magnitude (EVM) for the allocated resource blocks (RBs)

– EVM equalizer spectrum flatness derived from the equalizer coefficients generated by the EVM measurement process

– Carrier leakage (caused by IQ offset)

– In-band emissions for the non-allocated RB

In case the parameter 3300 or 3301 is reported from UE via txDirectCurrentLocation IE (as defined in TS 38.331 [7]), carrier leakage measurement requirement in clause 6.4.2.2 and 6.4.2.3 shall be waived, and the RF correction with regard to the carrier leakage and IQ image shall be omitted during the calculation of transmit modulation quality.

6.4G.2.1 Error Vector Magnitude

For UE supporting Tx diversity, the Error Vector Magnitude requirements specified in clause 6.4.2.1. The total EVM requirement is derived based on the measurement at each antenna connector according to Annex F.8.

6.4G.2.2 Carrier leakage

For UE supporting Tx diversity, the Relative Carrier Leakage Power requirements specified in Table 6.4.2.2-1 which is defined in clause 6.4.2.2 apply at each transmit antenna connector.

6.4G.2.3 In-band emissions

For UE supporting Tx diversity, the In-band Emission requirements specified in Table 6.4.2.3-1 which is defined in clause 6.4.2.3 apply at each transmit antenna connector.

6.4G.2.4 EVM equalizer spectrum flatness for Tx Diversity

For UE supporting Tx diversity, the EVM Equalizer Spectrum Flatness requirements specified in Table 6.4.2.4-1 and Table 6.4.2.4-2 which are defined in clause 6.4.2.4. The composite EVM equalizer EC(f) is defined as

where

EC_n(f) represents equalizer coefficient for each antenna connector, ，f is the allocated subcarriers within the transmission bandwidth ((|F|=12*);

P₁ and P₂ denote the linear power measured at each antenna connector respectively.