B.4 Beamforming Model

36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

B.4.1 Single-layer random beamforming (Antenna port 5, 7 or 8)

Single-layer transmission on antenna port 5 or on antenna port 7 or 8 without a simultaneous transmission on the other antenna port, is defined by using a precoder vector of size randomly selected with the number of layers from Table 6.3.4.2.3-1 in TS 36.211 [8] as beamforming weights. This precoder takes as an input the signal, , for antenna port , with the number of modulation symbols including the user-specific reference symbols (DRS), and generates a block of signals the elements of which are to be mapped onto the same physical RE but transmitted on different antenna elements:

Single-layer transmission on antenna port 7 or 8 with a simultaneous transmission on the other antenna port, is defined by using a pair of precoder vectors and each of size , which are not identical and randomly selected with the number of layers from Table 6.3.4.2.3-1 in TS 36.211 [8], as beamforming weights, and normalizing the transmit power as follows:

The precoder update granularity is specific to a test case.

The CSI reference symbols satisfying , , are transmitted on the same physical antenna element as the modulation symbols . The CSI reference symbols satisfying , , are transmitted on the same physical antenna element as the modulation symbols .

B.4.1A Single-layer random beamforming (Antenna port 7, 8, 11 or 13 with enhanced DMRS table configured)

Single-layer transmission on antenna port 11 with a simultaneous transmission on one antenna port from antenna port 7,8 or 13, is defined by using a pair of precoder vectors and each of size , which are not identical and randomly selected with the number of layers from Table 6.3.4.2.3-1 in [4], as beamforming weights, and normalizing the transmit power as follows:

The precoders takes and as the input the signals, , with the number of modulation symbols including the user-specific reference symbols (DM-RS), and generates a block of signals the elements of which are to be mapped onto the same physical RE but transmitted on different antenna elements.

The antenna port update granularity is specific to a test case.

The precoder update granularity is specific to a test case.

The CSI reference symbols satisfying, , are transmitted on the same physical antenna element as the modulation symbols . The CSI reference symbols satisfying, , are transmitted on the same physical antenna element as the modulation symbols .

B.4.2 Dual-layer random beamforming (antenna ports 7 and 8)

Dual-layer transmission on antenna ports 7 and 8 is defined by using a precoder matrix of size randomly selected with the number of layers from Table 6.3.4.2.3-1 in TS 36.211 [8] as beamforming weights. This precoder takes as an input a block of signals for antenna ports 7 and 8, , , with being the number of modulation symbols per antenna port including the user-specific reference symbols, and generates a block of signals the elements of which are to be mapped onto the same physical RE but transmitted on different antenna elements:

The precoder update granularity is specific to a test case.

B.4.3 Generic beamforming model (antenna ports 7-14)

The transmission on antenna port(s) is defined by using a precoder matrix of size , where is the number of CSI reference signals configured per test and is the number of spatial layers. This precoder takes as an input a block of signals for antenna port(s) , , , with being the number of modulation symbols per antenna port including the user-specific reference symbols (DM-RS), and generates a block of signals the elements of which are to be mapped onto the same time-frequency index pair but transmitted on different physical antenna elements:

The precoder matrix is specific to a test case.

The physical antenna elements are identified by indices , where is the number of physical antenna elements configured per test.

Modulation symbols with (i.e. beamformed PDSCH and DM-RS) are mapped to the physical antenna index.

Modulation symbols with (i.e. PBCH, PDCCH, PHICH, PCFICH) are mapped to the physical antenna index , where is the number of cell-specific reference signals configured per test.

Modulation symbols with (i.e. CRS) are mapped to the physical antenna index , where is the number of cell-specific reference signals configured per test.

Modulation symbols with (i.e. CSI-RS) are mapped to the physical antenna index , where is the number of CSI reference signals configured per test.

B.4.4 Random beamforming for EPDCCH distributed transmission (Antenna port 107 and 109)

EPDCCH distributed transmission on antenna port 107 and antenna port 109 is defined by using a pair of precoder vectors and each of size , which are not identical and randomly selected per EPDCCH PRB pair with the number of layers from Table 6.3.4.2.3-1 in [8], as beamforming weights. This precoder takes as an input the signal, , for antenna port , with the number of modulation symbols including the user-specific reference symbols (DMRS), and generates a block of signals . When EPDCCH is associated with port 107, the transmitted block of signals is denoted as

When EPDCCH is associated with port 109, the transmitted block of signals is denoted as

B.4.5 Random beamforming for EPDCCH localized transmission (Antenna port 107, 108, 109 or 110)

EPDCCH localized transmission on antenna port 107, 108, 109 or 110 is defined by using a precoder vector of size 2×1 randomly selected with the number of layers from Table 6.3.4.2.3-1 in [8] as beamforming weights. This precoder takes as an input the signal,, for antenna port , with the number of modulation symbols including the user-specific reference symbols (DMRS), and generates a block of signals the elements of which are to be mapped onto the same physical RE but transmitted on different antenna elements:

B.4.6 Beamforming model for CRI test

– is precoder matrix

– is amplitude scaling factor for CRI test,

– is power scaling factor as following definition:

– , A = 5 dB, B = -1.3351 dB.

– controls the phase variation, and the phase for m-th subframe is denoted by, where is the random start value with the uniform distribution, i.e., , is the step of phase variation which is defined in Table B.4.6-1, and m is the linear increment of 1 for every sub-frame throughout the simulation.

– K is the number of configured CSI-RS resources

–

– For following CRI with multiple CSI-RS resources configured, equals to CRI value reported by UE

– For fixed CRI with single CSI-RS resource configure, equals to 0.

Table B.4.6-1: The step of phase variation

Variation Step	Value (rad/subframe)
	1.2566×10^-3

The physical antenna elements are identified by indices, where is the number of physical antenna elements configured per test.

Modulation symbols with (i.e. beamformed PDSCH and DM-RS) are mapped to the physical antenna index.

For the k-th configured CSI-RS resource, modulation symbols with (i.e. CSI-RS) are firstly multiplied by amplitude scaling factor to generate power scaled symbols:

– equals to CSI-RS resource index (k-th)

And power scaled symbols with (i.e. power scaled CSI-RS) are mapped to the physical antenna index, where is the number of CSI reference signals configured per test.

Modulation symbols with (i.e. PBCH, PDCCH, PHICH, PCFICH) are mapped to the physical antenna index , where is the number of cell-specific reference signals configured per test.

Modulation symbols with (i.e. CRS) are mapped to the physical antenna index , where is the number of cell-specific reference signals configured per test.