Content for  TS 38.215  Word version:  18.0.0

Sidelink Received Signal Strength Indicator (SL RSSI) is defined as the linear average of the total received power (in [W]) observed in the configured sub-channel in OFDM symbols of a slot configured for PSCCH and PSSCH, starting from the 2nd OFDM symbol. For frequency range 1, the reference point for the SL RSSI shall be the antenna connector of the UE. For frequency range 2, SL RSSI shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch. For frequency range 1 and 2, if receiver diversity is in use by the UE, the reported SL RSSI value shall not be lower than the corresponding SL RSSI of any of the individual receiver branches.

Sidelink Channel Occupancy Ratio (SL CR) evaluated at slot n is defined as the total number of sub-channels used for its transmissions in slots [n-a, n-1] and granted in slots [n, n+b] divided by the total number of configured sub-channels in the transmission pool over [n-a, n+b].

SL Channel Busy Ratio (SL CBR) measured in slot n is defined as the portion of sub-channels in the resource pool whose SL RSSI measured by the UE exceed a (pre-)configured threshold sensed over a CBR measurement window [n-a, n-1], wherein a is equal to 100 or 100·2^µ slots, according to higher layer parameter sl-TimeWindowSizeCBR. a CBR measurement window [n-a, n-1], wherein a is equal to 100 or 100·2μ slots, according to higher layer parameter sl-TimeWindowSizeCBR. When UE is configured to perform partial sensing by higher layers (including when SL DRX is configured), SL RSSI is measured in slots where the UE performs partial sensing and where the UE performs PSCCH/PSSCH reception within the CBR measurement window. The calculation of SL CBR is limited within the slots for which the SL RSSI is measured. If the number of SL RSSI measurement slots within the CBR measurement window is below a (pre-)configured threshold, a (pre-)configured SL CBR value is used.

DL PRS reference signal received power (DL PRS-RSRP), is defined as the linear average over the power contributions (in [W]) of the resource elements that carry DL PRS reference signals configured for RSRP measurements within the considered measurement frequency bandwidth. For frequency range 1, the reference point for the DL PRS-RSRP shall be the antenna connector of the UE. For frequency range 2, DL PRS-RSRP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch. For frequency range 1 and 2, if receiver diversity is in use by the UE, the reported DL PRS-RSRP value shall not be lower than the corresponding DL PRS-RSRP of any of the individual receiver branches.

DL reference signal time difference (DL RSTD) is the DL relative timing difference between the Transmission Point (TP) [18] j and the reference TP i, defined as T_SubframeRxj - T_SubframeRxi, Where:

• T_SubframeRxj is the time when the UE receives the start of one subframe from TP j.
• T_SubframeRxi is the time when the UE receives the corresponding start of one subframe from TP i that is closest in time to the subframe received from TP j.

Multiple DL PRS resources can be used to determine the start of one subframe from a TP. For frequency range 1, the reference point for the DL RSTD shall be the antenna connector of the UE. For frequency range 2, the reference point for the DL RSTD shall be the antenna of the UE.

The UE Rx - Tx time difference is defined as T_UE-RX - T_UE-TX Where:

• T_UE-RX is the UE received timing of downlink subframe #i from a Transmission Point (TP) [18], defined by the first detected path in time.
• T_UE-TX is the UE transmit timing of uplink subframe #j that is closest in time to the subframe #i received from the TP.

Multiple DL PRS or CSI-RS for tracking resources, as instructed by higher layers, can be used to determine the start of one subframe of the first arrival path of the TP. For frequency range 1, the reference point for T_UE-RX measurement shall be the Rx antenna connector of the UE and the reference point for T_UE-TX measurement shall be the Tx antenna connector of the UE. For frequency range 2, the reference point for T_UE-RX measurement shall be the Rx antenna of the UE and the reference point for T_UE-TX measurement shall be the Tx antenna of the UE.

SS reference signal antenna relative phase (SS-RSARP) is defined as the difference of the average phase of the receive signals on the resource elements that carry secondary synchronization signals (SS) received by the reference individual receiver branch (Rx0) and the average phase of the receive signals on the resource elements that carry secondary synchronization signals (SS) received by one other individual receiver branch (Rx1 ... Rxn). The measurement time resource(s) for SS-RSARP are confined within SS/PBCH Block Measurement Time Configuration (SMTC) window duration. SS-RSARP shall be measured only among the reference signals corresponding to SS/PBCH blocks with the same SS/PBCH block index and the same physical-layer cell identity. If higher-layers indicate certain SS/PBCH blocks for performing SS-RSARP measurements, then SS-RSARP is measured only from the indicated set of SS/PBCH block(s). For frequency range 1, the reference point for the SS-RSARP shall be the antenna connector of the UE. For frequency range 2, SS-RSARP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.

Received Signal Code Power, the received power on one code measured on the Primary CPICH. The reference point for the RSCP shall be the antenna connector of the UE. If Tx diversity is applied on the Primary CPICH the received code power from each antenna shall be separately measured and summed together in [W] to a total received code power on the Primary CPICH. If receiver diversity is in use by the UE, the reported value shall not be lower than the corresponding CPICH RSCP of any of the individual receive antenna branches.

The received wide band power, including thermal noise and noise generated in the receiver, within the bandwidth defined by the receiver pulse shaping filter. The reference point for the measurement shall be the antenna connector of the UE. If receiver diversity is in use by the UE, the reported value shall not be lower than the corresponding UTRA carrier RSSI of any of the individual receive antenna branches.

The received energy per chip divided by the power density in the band. If receiver diversity is not in use by the UE, the CPICH Ec/No is identical to CPICH RSCP/UTRA Carrier RSSI. Measurement shall be performed on the Primary CPICH. The reference point for the CPICH Ec/No shall be the antenna connector of the UE. If Tx diversity is applied on the Primary CPICH the received energy per chip (Ec) from each antenna shall be separately measured and summed together in [Ws] to a total received chip energy per chip on the Primary CPICH, before calculating the Ec/No. If receiver diversity is in use by the UE, the measured CPICH Ec/No value shall not be lower than the corresponding CPICH RSCPi/UTRA Carrier RSSIi of receive antenna branch i.

DL PRS reference signal received path power (DL PRS-RSRPP), is defined as the power of the linear average of the channel response at the i-th path delay of the resource elements that carry DL PRS signal configured for the measurement, where DL PRS-RSRPP for the 1st path delay is the power contribution corresponding to the first detected path in time. For frequency range 1, the reference point for the DL PRS-RSRPP shall be the antenna connector of the UE. For frequency range 2, DL PRS-RSRPP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch. For frequency range 1 and 2, if receiver diversity is in use by the UE for DL PRS-RSRPP measurements, the reported DL PRS-RSRPP value included in the higher layer parameter NR-DL-AoD-MeasElement for the first and additional measurements shall be provided for the same receiver branch(es) as applied for DL PRS-RSRP measurements.

Sidelink PRS reference signal received power (SL PRS-RSRP) is defined as the linear average over the power contributions (in W) of the resource elements that carry SL PRS reference signals configured for RSRP measurements within the considered measurement frequency bandwidth. For frequency range 1, the reference point for the SL PRS-RSRP shall be the antenna connector of the UE. For frequency range 1, if receiver diversity is in use by the UE, the reported SL PRS-RSRP value shall not be lower than the corresponding SL PRS-RSRP of any of the individual receiver branches. For frequency range 2, SL PRS-RSRP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch. If receiver diversity is in use by the UE, the reported SL PRS-RSRP value shall not be lower than the corresponding SL PRS-RSRP of any of the individual receiver branches.

Sidelink PRS reference signal received path power (SL PRS-RSRPP) is defined as the power of the linear average of the channel response at the i-th path delay of the resource elements that carry SL PRS configured for the measurement, where SL PRS-RSRPP for the 1st path delay is the power contribution corresponding to the first detected path in time. For frequency range 1, the reference point for the SL PRS-RSRPP shall be the antenna connector of the UE. For frequency range 1, if receiver diversity is in use by the UE, the reported SL PRS-RSRPP value shall not be lower than the corresponding SL PRS-RSRPP of any of the individual receiver branches. For frequency range 2, SL PRS-RSRPP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch. If receiver diversity is in use by the UE, the reported SL PRS-RSRPP value shall not be lower than the corresponding SL PRS-RSRPP of any of the individual receiver branches.

The SL relative time of arrival (T_SL-RTOA) is defined as the beginning time of SL subframe # i containing SL PRS received from a UE, relative to the relative time of arrival (RTOA) reference time. The SL RTOA reference time is defined as T₀ + t_SL-PRS, where

• T₀ is the nominal beginning time of SFN 0 or DFN 0, provided by SFN and DFN initialization time, respectively.
• t_SL-PRS = (10n_f + n_sf)×10^-3, where n_f and n_sf are the SFN or DFN and the subframe number of the SL PRS, respectively.

For frequency range 1, the reference point for T_SL-RTOA measurement shall be the Rx antenna connector of the UE. For frequency range 2, the reference point for TSL-RTOA measurement shall be the Rx antenna of the UE.

The SL angle of arrival (SL AoA) is defined as the estimated azimuth angle and vertical angle of a transmitting UE with respect to a reference direction, wherein the reference direction is defined:

• In the global coordinate system (GCS), wherein estimated azimuth angle is measured relative to geographical North and is positive in a counter-clockwise direction and estimated vertical angle is measured relative to zenith and positive to horizontal direction
• In the local coordinate system (LCS), wherein estimated azimuth angle is measured relative to x-axis of LCS and positive in a counter-clockwise direction and estimated vertical angle is measured relative to z-axis of LCS and positive to x-y plane direction. The bearing, downtilt and slant angles of LCS are defined according to TS 38.901.

The SL-AoA is determined at the receiving UE's antenna(s) for a SL channel corresponding to the transmitting UE.

The SL Rx - Tx time difference at a UE is defined as T_UE-RX - T_UE-TX Where:

• T_UE-RX is the UE received timing of sidelink subframe #i from a transmitting UE, defined by the first detected path in time.
• If the UE reports the transmission timestamp of a SL PRS, T_UE-TX is the transmit timing of the sidelink subframe #j of the SL PRS of the UE. Otherwise, T_UE-TX is the transmit timing of the UE of sidelink subframe #j that is closest in time to the subframe #i received from the transmitting UE.
• The same antenna reference point is used for receiver and transmitter for the Rx-Tx time difference measurement.

If the UE reports the transmission timestamp of a SL PRS, the SL Rx-Tx time difference is modulo wrapped around to result in values between -0.5 ms to +0.5 ms For frequency range 1, the reference point for T_UE-RX measurement shall be the Rx antenna connector of the UE and the reference point for T_UE-TX measurement shall be the Tx antenna connector of the UE. For frequency range 2, the reference point for T_UE-RX measurement shall be the Rx antenna of the UE and the reference point for T_UE-TX measurement shall be the Tx antenna of the UE.

The SL reference signal time difference (SL RSTD) is the SL relative timing difference between the UE_j and the reference UE_i, defined as T_SL-RXi - T_SL-RXj, where:

• T_SL-RXj is the time when the UE receives the start of one subframe from UE_j
• T_SL-RXi is the time when the UE receives the corresponding start of one subframe from UE_i that is closest in time to the subframe received from UE_j

For frequency range 1, the reference point for SL RSTD measurement shall be the Rx antenna connector of the UE. For frequency range 2, the reference point for SL RSTD measurement shall be the Rx antenna of the UE.

DL reference signal carrier phase (RSCP) (of i-th path) is defined as the phase of the channel response at the i-th path delay derived from the resource elements carrying DL PRS configured for the measurement. DL RSCP is associated with the center frequency of the DL positioning frequency layer (PFL) configured for the measurement. For frequency range 1, the reference point for the DL RSCP shall be the antenna connector of the UE. For frequency range 2, the reference point for the DL RSCP shall be the antenna of the UE.

DL reference signal carrier phase difference (RSCPD) is defined as the difference of DL RSCPs measured from DL PRS transmitted in a DL PFL from the transmission point (TP) j and the reference TP i. If UE reports RSCPD measurements together with RSTD measurements in a measurement report element, the reference TP for RSCPD is the same as the reference TP reported for RSTD. For frequency range 1, the reference point for the DL RSCPD shall be the antenna connector of the UE. For frequency range 2, the reference point for the DL RSCPD shall be the antenna of the UE.

Sidelink PRS Received Signal Strength Indicator (SL PRS-RSSI) is defined as the linear average of the total received power (in [W]) observed in OFDM symbols of SL-PRS and PSCCH of slots configured for PSCCH and SL-PRS. For frequency range 1, the reference point for the SL PRS-RSSI shall be the antenna connector of the UE. For frequency range 2, SL PRS-RSSI shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch. For frequency range 1 and 2, if receiver diversity is in use by the UE, the reported SL PRS-RSSI value shall not be lower than the corresponding SL PRS-RSSI of any of the individual receiver branches.

Time domain channel property (TDCP) is defined as wideband normalized correlation between two CSI-RS transmission occasions, corresponding to CSI-RS resourece(s) from NZP-CSI-RS-ResourceSet(s) configured with higher layer parameter trs-info, that are separated by Dn symbols or slots, depending on the configuration, where Dn is the n-th delay configured value among [placeHolderForRrcParameter-D] configured delay values {D1, …, DY} and Y is number of configured delay values. The wideband normalized correlation value in TDCP is quantized in amplitude and if configured by [placeHolderForRrcParameter-phaseQuanOn], in phase, as described in clause 5.2.1.4.5 of TS 38.214. For frequency range 1, the reference point for the TDCP shall be the antenna connector of the UE. For frequency range 2, TDCP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.

UE Rx - Tx time difference offset is the actual index difference between subframe #j and subframe #i of the subframes used for the UE Rx - Tx time difference measurement as defined in Clause 5.1.30, where uplink subframe #j is the closest in time to the DL subframe #i received from a transmission point (TP) [18]. For frequency range 1, the reference point for UE Rx - Tx time difference offset measurement shall be the same antenna connectors as defined in Clause 5.1.30 for the UE Rx - Tx time difference measurement. For frequency range 2, the reference point UE Rx - Tx time difference offset measurement shall be the same antenna as defined in clause 5.1.30 for of the UE Rx - Tx time difference measurement.

DL timing drift measurement is defined as the DL timing estimated to be shifted due to Doppler over the service link associated with the UE Rx-Tx time difference measurement period. For frequency range 1, the reference point for the DL timing drift measurement shall be the Rx antenna connector of the UE. For frequency range 2, the reference point for the DL timing drift measurement shall be the Rx antenna of the UE.