7.2.5 Channel-State Information – Reference Signal (CSI-RS) definition

36.2133GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical layer proceduresRelease 17TS

For a serving cell and UE configured in transmission mode 9 and not configured with higher layer parameter eMIMO-Type and eMIMO-Type2, the UE can be configured with one CSI-RS resource configuration.

For a serving cell and UE configured in transmission mode 9 and configured with higher layer parameter eMIMO-Type, and eMIMO-Type is set to ‘CLASS A’, the UE can be configured with one CSI-RS resource configuration.

For a serving cell and UE configured in transmission mode 9 and configured with higher layer parameter eMIMO-Type, and eMIMO-Type is set to ‘CLASS B’, the UE can be configured with one or more CSI-RS resource configuration(s).

For a serving cell and UE configured in transmission mode 9 and configured with higher layer parameter eMIMO-Type2, and eMIMO-Type2 is set to ‘CLASS B’, the UE can be configured with one CSI-RS resource configuration.

For a serving cell and UE configured in transmission mode 10, the UE can be configured with one or more CSI-RS resource configuration(s).

The following parameters for which the UE shall assume non-zero transmission power for CSI-RS are configured via higher layer signaling for each CSI-RS resource configuration:

– CSI-RS resource configuration identity, if the UE is configured in transmission mode 9 and configured with higher layer parameter eMIMO-Type, and eMIMO-Type is set to ‘CLASS B’, and the UE is configured with more than one CSI-RS resource configurations, or if the UE is configured in transmission mode 10,

– Number of CSI-RS ports. The allowable values and port mapping are given in Clause 6.10.5 of [3].

– CSI RS Configuration (see Table 6.10.5.2-1 and Table 6.10.5.2-2 in [3])

– CSI RS subframe configuration except for aperiodic CSI-RS resource configuration. The allowable values are given in Clause 6.10.5.3 of [3].

– UE assumption on reference PDSCH transmitted power for CSI feedback , if the UE is configured in transmission mode 9.

– UE assumption on reference PDSCH transmitted power for CSI feedback for each CSI process, if the UE is configured in transmission mode 10. If CSI subframe sets and are configured by higher layers for a CSI process, is configured for each CSI subframe set of the CSI process.

– Pseudo-random sequence generator parameter, . The allowable values are given in [11].

– CDM type parameter, if the UE is configured with higher layer parameter eMIMO-Type, and eMIMO-Type is set to ‘CLASS A’ for a CSI process. The allowable values are given in Clause 6.10.5.2 of [3].

– frequencyDensity, if the UE is configured with higher layer parameter eMIMO-Type or eMIMO-Type2 for a CSI process. The allowable values are given in Clause 6.10.5.2 of [3].

– transmissionComb, if the UE is configured with higher layer parameter eMIMO-Type or eMIMO-Type2 for a CSI process. The allowable values are given in Clause 6.10.5.2 of [3].

– Higher layer parameter qcl-CRS-Info-r11 for quasi co-location type B or type C UE assumption of CRS antenna ports and CSI-RS antenna ports with the following parameters, if the UE is configured in transmission mode 10:

– qcl-ScramblingIdentity-r11.

– crs-PortsCount-r11.

– mbsfn-SubframeConfigList-r11.

is the assumed ratio of PDSCH EPRE to CSI-RS EPRE when UE derives CSI feedback and takes values in the range of [-8, 15] dB with 1 dB step size, where the PDSCH EPRE corresponds to the symbols for which the ratio of the PDSCH EPRE to the cell-specific RS EPRE is denoted by , as specified in Table 5.2-2 and Table 5.2-3.

A UE should not expect the configuration of CSI-RS and PMCH in the same subframe of a serving cell.

A BL/CE UE configured with CEModeA and higher layer parameter ce-CSI-RS-Feedback is not expected to be configured with aperiodic CSI-RS resource configuration.

For frame structure type 2 serving cell and 4 CRS ports, the UE is not expected to receive a CSI RS Configuration index (see Table 6.10.5.2-1 and Table 6.10.5.2-2 in [3]) belonging to the set [20-31] for the normal CP case or the set [16-27] for the extended CP case.

A UE may assume the CSI-RS antenna ports of a CSI-RS resource configuration are quasi co-located (as defined in [3]) with respect to delay spread, Doppler spread, Doppler shift, average gain, and average delay.

A UE configured in transmission mode 10 and with quasi co-location type B or type C, may assume the antenna ports 0 – 3 associated with qcl-CRS-Info-r11 corresponding to a CSI-RS resource configuration and antenna ports 15 – 46 corresponding to the CSI-RS resource configuration are quasi co-located (as defined in [3]) with respect to Doppler shift, and Doppler spread.

A UE configured in transmission mode 10, and configured with higher layer parameter eMIMO-Type, and eMIMO-Type is set to ‘CLASS B’, and the number of configured CSI-RS resources is more than one for a CSI process, and with quasi co-location type B, is not expected to receive CSI-RS resource configurations for the CSI process that have different values of the higher layer parameter qcl-CRS-Info-r11.

A UE configured in transmission mode 10, and configured with higher layer parameter eMIMO-Type and eMIMO-Type2, and with quasi co-location type B, is not expected to receive CSI-RS resource configurations for eMIMO-Type and eMIMO-Type2 of the CSI process that have different values of the higher layer parameter qcl-CRS-Info-r11.

A BL/CE UE configured with CEModeA or CEModeB is not expected to be configured with non-zero transmission power CSI-RS, except when the BL/CE UE is configured with the higher layer parameter ce-CSI-RS-Feedback.

A UE configured in transmission mode 9 or 10, and configured with higher layer parameter eMIMO-Type, and eMIMO-Type is set to ‘CLASS A’, and more than one CSI-RS configurations for a CSI-RS resource, is not expected to receive CSI-RS configurations for the CSI-RS resource that have different values of frequencyDensity.