Content for  TS 38.215  Word version:  18.3.0

The IEEE 802.11 WLAN RSSI as used in RRC specification [10] refers to RSSI as defined in IEEE 802.11 specification [11], measured from Beacon, DMG Beacon or FILS discovery frames (in passive scanning mode) or from probe response frames (in active scanning mode).

The relative timing difference between the E-UTRA neighbour cell j and the E-UTRA reference cell i, defined as T_SubframeRxj - T_SubframeRxi, where: T_SubframeRxj is the time when the UE receives the start of one subframe from E-UTRA cell j. T_SubframeRxi is the time when the UE receives the corresponding start of one subframe from E-UTRA cell i that is closest in time to the subframe received from E-UTRA cell j. The reference point for the observed subframe time difference shall be the antenna connector of the UE.

The observed SFN and frame timing difference (SFTD) between an E-UTRA PCell and an NR PSCell (for EN-DC), or an NR PCell and an E-UTRA PSCell (for NE-DC), or an NR PCell and an NR PSCell (for NR-DC), or an NR PCell and NR neighbour cell (for UEs with NR PCell but no E-UTRA/NR PSCell) is defined as comprising the following two components:

• SFN offset = (SFN_PCell - SFN_TRGCell) mod 1024, where SFN_PCell is the SFN of a PCell radio frame and SFN_TRGCell is the SFN of the target cell radio frame of which the UE receives the start closest in time to the time when it receives the start of the PCell radio frame.
• Frame boundary offset = [(T_{FrameBoundaryPCell} - T_{FrameBoundaryTRGCell})], where T_{FrameBoundaryPCell} is the time when the UE receives the start of a radio frame from the PCell, T_{FrameBoundaryTRGCell} is the time when the UE receives the start of the radio frame, from the target cell, that is closest in time to the radio frame received from the PCell. The unit of (T_{FrameBoundaryPCell} - T_{FrameBoundaryTRGCell}) is Ts.

E-UTRA Reference signal received power (E-UTRA RSRP), is defined as the linear average over the power contributions (in [W]) of the resource elements that carry cell-specific reference signals within the considered measurement frequency bandwidth. For E-UTRA RSRP determination the cell-specific reference signals R0 according to TS 36.211 shall be used. If the UE can reliably detect that R1 is available it may use R₁ in addition to R₀ to determine E-UTRA RSRP. If higher layers indicate measurements based on discovery signals, the UE shall measure E-UTRA RSRP in the subframes in the configured discovery signal occasions. For frame structure 1 and 2, if the UE can reliably detect that cell-specific reference signals are present in other subframes, the UE may use those subframes in addition to determine E-UTRA RSRP. The reference point for the E-UTRA RSRP 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 E-UTRA RSRP of any of the individual diversity branches.

E-UTRA Reference Signal Received Quality (E-UTRA RSRQ) is defined as the ratio N×E-UTRA RSRP/(E-UTRA carrier RSSI), where N is the number of RBs of the E-UTRA carrier RSSI measurement bandwidth. The measurements in the numerator and denominator shall be made over the same set of resource blocks. E-UTRA Carrier Received Signal Strength Indicator (E-UTRA RSSI), comprises the linear average of the total received power (in [W]) observed only in certain OFDM symbols of measurement subframes, in the measurement bandwidth, over N number of resource blocks by the UE from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc. Unless indicated otherwise by higher layers, E-UTRA RSSI is measured only from OFDM symbols containing reference symbols for antenna port 0 of measurement subframes. If higher layers indicate all OFDM symbols for performing E-UTRA RSRQ measurements, then E-UTRA RSSI is measured from all OFDM symbols of the DL part of measurement subframes. If higher-layers indicate certain subframes for performing E-UTRA RSRQ measurements, then E-UTRA RSSI is measured from all OFDM symbols of the DL part of the indicated subframes. If higher layers indicate measurements based on discovery signals, E-UTRA RSSI is measured from all OFDM symbols of the DL part of the subframes in the configured discovery signal occasions. The reference point for the E-UTRA RSRQ 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 E-UTRA RSRQ of any of the individual diversity branches.

E-UTRA reference signal-signal to noise and interference ratio (E-UTRA RS-SINR), is defined as the linear average over the power contribution (in [W]) of the resource elements carrying cell-specific reference signals divided by the linear average of the noise and interference power contribution (in [W]) over the resource elements carrying cell-specific reference signals within the same frequency bandwidth. For E-UTRA RS-SINR determination, the E-UTRA cell-specific reference signals R0 according TS 36.211 shall be used. The reference point for the E-UTRA RS-SINR 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 E-UTRA RS-SINR of any of the individual diversity branches. If higher-layer signalling indicates certain subframes for performing E-UTRA RS-SINR measurements, then E-UTRA RS-SINR is measured in the indicated subframes.

SS reference signal received power per branch (SS-RSRPB) is defined as the linear average over the power contributions (in [W]) of the resource elements that carry secondary synchronization signals (SS). The measurement time resource(s) for SS-RSRPB are confined within SS/PBCH Block Measurement Time Configuration (SMTC) window duration. For SS-RSRPB determination demodulation reference signals for physical broadcast channel (PBCH) in addition to secondary synchronization signals may be used. SS-RSRPB using demodulation reference signal for PBCH shall be measured by linear averaging over the power contributions of the resource elements that carry corresponding reference signals taking into account power scaling for the reference signals as defined in TS 38.213. SS-RSRPB 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-RSRPB measurements, then SS-RSRPB is measured only from the indicated set of SS/PBCH block(s). For frequency range 1, SS-RSRPB shall be measured from each antenna connector of the UE. For frequency range 2, SS-RSRPB shall be measured for each receiver branch based on the combined signal from antenna elements corresponding to the receiver branch.

SRS reference signal received power (SRS-RSRP) is defined as linear average of the power contributions (in [W]) of the resource elements carrying sounding reference signals (SRS). SRS-RSRP shall be measured over the configured resource elements within the considered measurement frequency bandwidth in the configured measurement time occasions. For frequency range 1, the reference point for the SRS-RSRP shall be the antenna connector of the UE. For frequency range 2, SRS-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 SRS-RSRP value shall not be lower than the corresponding SRS-RSRP of any of the individual receiver branches.

CLI Received Signal Strength Indicator (CLI-RSSI), is defined as linear average of the total received power (in [W]) observed only in the configured OFDM symbols of the configured measurement time resource(s), in the configured measurement bandwidth from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc. For frequency range 1, the reference point for the RSSI shall be the antenna connector of the UE. For frequency range 2, CLI-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 CLI-RSSI value shall not be lower than the corresponding CLI-RSSI of any of the individual receiver branches.

Received Signal Strength Indicator (RSSI), comprises the linear average of the total received power (in [W]) observed only per configured OFDM symbol and in the measurement bandwidth indicated by higher layers or corresponding to the channel bandwidth defined in Clause 4 of TS 37.213, where the channel has the center frequency configured by ARFCN-valueNR, by the UE from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc. Higher layers configure the ARFCN-valueNR, the reference numerology and the measurement duration, i.e., which OFDM symbol(s) should be measured by the UE. For frequency range 1, the reference point for the RSSI shall be the antenna connector of the UE. For frequency range 2, RSSI shall be measured for each receiver branch based on the combined signal from antenna elements corresponding to the receiver branch. For frequency range 1 and 2, if receiver diversity is in use by the UE, the reported RSSI value shall not be lower than the corresponding RSSI of any of the individual receiver branches.

PSBCH Reference Signal Received Power (PSBCH-RSRP) is defined as the linear average over the power contributions (in [W]) of the resource elements that carry demodulation reference signals associated with physical sidelink broadcast channel (PSBCH). For PSBCH-RSRP sidelink secondary synchronization signals in addition to demodulation reference signals for PSBCH may be used. PSBCH-RSRP using sidelink secondary synchronization signals shall be measured by linear averaging over the power contributions of the resource elements that carry corresponding reference signals. For frequency range 1, the reference point for the PSBCH RSRP shall be the antenna connector of the UE. For frequency range 2, PSBCH-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 PSBCH-RSRP value shall not be lower than the corresponding PSBCH-RSRP of any of the individual receiver branches.

PSSCH Reference Signal Received Power (PSSCH-RSRP) is defined as the linear average over the power contributions (in [W]) of the resource elements of the antenna port(s) that carry demodulation reference signals associated with physical sidelink shared channel (PSSCH), summed over the antenna ports. Demodulation reference signals transmitted on antenna ports 1000 and 1001 shall be used for PSSCH-RSRP determination if two antenna ports are indicated. For frequency range 1, the reference point for the PSSCH-RSRP shall be the antenna connector of the UE. For frequency range 2, PSSCH-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 PSSCH-RSRP value shall not be lower than the corresponding PSSCH-RSRP of any of the individual receiver branches.

PSCCH Reference Signal Received Power (PSCCH-RSRP) is defined as the linear average over the power contributions (in [W]) of the resource elements that carry demodulation reference signals associated with physical sidelink control channel (PSCCH). For frequency range 1, the reference point for the PSCCH-RSRP shall be the antenna connector of the UE. For frequency range 2, PSCCH-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 PSCCH-RSRP value shall not be lower than the corresponding PSCCH-RSRP of any of the individual receiver branches.