Energy per resource element ratio for non-zero power channel state information reference signals

Certain aspects of the present disclosure provide techniques for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signals (CSI-RSs) when a device is measuring a wireless channel. A method that may be performed by a user equipment (UE) includes determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

BACKGROUND

Field of the Disclosure

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signal (CSI-RSs) resources when a device is measuring a wireless channel.

Description of Related Art

SUMMARY

Certain aspects of the subject matter described in this disclosure can be implemented in a method for wireless communications by a user equipment (UE). The method generally includes: determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in a method for wireless communications by a base station (BS). The method generally includes: determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in a method for wireless communications by a user equipment (UE). The method generally includes: determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and performing a layer one signal to interference and noise ratio (L1-SINR) measurement using at least the NZP CSI-RS resource without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in a method for wireless communications by a base station (BS). The method generally includes: determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receiving one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: a memory; and a processor coupled to the memory and configured to: determine, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and measure a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: a memory; and a processor coupled to the memory and configured to: determine an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receive one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: a memory; and a processor coupled to the memory and configured to: determine, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and perform a layer one signal to interference and noise ratio (L1-SINR) measurement without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: a memory; and a processor coupled to the memory and configured to: determine an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receive one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: means for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and means for measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: means for determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and means for receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: means for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and means for performing a layer one signal to interference and noise ratio (L1-SINR) measurement without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in an apparatus in a wireless communications system. The apparatus generally includes: means for determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and means for receiving one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in a computer-readable medium storing computer-executable code that, when executed by a processing system, causes the processing system to perform operations generally including: determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in a computer-readable medium storing computer-executable code that, when executed by a processing system, causes the processing system to perform operations generally including: determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in a computer-readable medium storing computer-executable code that, when executed by a processing system, causes the processing system to perform operations generally including: determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and performing a layer one signal to interference and noise ratio (L1-SINR) measurement without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

Certain aspects of the subject matter described in this disclosure can be implemented in a computer-readable medium storing computer-executable code that, when executed by a processing system, causes the processing system to perform operations generally including: determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receiving one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource.

DETAILED DESCRIPTION

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signals (CSI-RSs) when a device is measuring a wireless channel. In previously known techniques (e.g., 3GPP Release 15 (Rel-15)), when an NZP CSI-RS resource is configured on a UE for interference measurement, the UE scales the measurement(s) (e.g., reference signal received power (RSRP)) based on an EPRE ratio associated with the NZP CSI-RS resource. For example, for CSI measurement(s), a UE may assume (1) each NZP CSI-RS port configured for interference measurement corresponds to an interference transmission layer, (2) all interference transmission layers on NZP CSI-RS ports for interference measurement take into account associated EPRE ratios, and (3) other interference signals occur on REs of an NZP CSI-RS resource for channel measurement, REs of an NZP CSI-RS resource for interference measurement, or REs of a CSI interference measurement (CSI-IM) resource for interference measurement. However, there may be two EPRE ratios configured per NZP CSI-RS resource, and thus it is desirable to develop techniques to specify which EPRE ratio a UE uses when measuring an NZP CSI-RS resource. The two EPRE ratios for each NZP CSI-RS resource may be referred to as powerControlOffset and powerControlOffsetSS. In some techniques, powerControlOffset is the assumed ratio of physical downlink shared channel (PDSCH) EPRE to NZP CSI-RS EPRE when a UE derives CSI feedback for the NZP CSI-RS resource. In these techniques, powerControlOffset may have values in the range of [−8, 15] dB with 1 dB step size. In some techniques, powerControlOffsetSS is the assumed ratio of NZP CSI-RS EPRE to synchronization signal or physical broadcast channel (SS/PBCH) block EPRE.

The following description provides examples of a device determining an EPRE ratio for NZP CSI-RS resources when a device is measuring a wireless channel in communication systems, and is not limiting of the scope, applicability, or examples set forth in the claims. The following description also provides examples of a device measuring NZP CSI-RS resources when a device is measuring a wireless channel in communication systems without scaling a measured energy based on an EPRE ratio for the NZP CSI-RS resource, and is not limiting of the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects.

The techniques described herein may be used for various wireless networks and radio technologies. While aspects may be described herein using terminology commonly associated with 3G, 4G, and/or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.

NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or wider), millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or higher), massive machine type communications (mMTC) targeting non-backward compatible machine type communications (MTC) techniques, and/or mission critical techniques targeting ultra-reliable low-latency communications (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements. In addition, these services may co-exist in the same subframe. NR supports beamforming and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.

FIG.1illustrates an example wireless communication network100in which aspects of the present disclosure may be performed. For example, the wireless communication network100may be an NR system (e.g., a 5G NR network). As shown inFIG.1, the wireless communication network100may be in communication with a core network132. The core network132may in communication with one or more base station (BSs)110and/or user equipment (UE)120in the wireless communication network100via one or more interfaces.

The BSs110communicate with UEs120a-y(each also individually referred to herein as UE120or collectively as UEs120) in the wireless communication network100. The UEs120(e.g.,120x,120y, etc.) may be dispersed throughout the wireless communication network100, and each UE120may be stationary or mobile. Wireless communication network100may also include relay stations (e.g., relay station110r), also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS110aor a UE120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE120or a BS110), or that relays transmissions between UEs120, to facilitate communication between devices.

According to certain aspects, the BSs110and UEs120may be configured for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signals (CSI-RSs) when a device is measuring a wireless channel. As shown inFIG.1, the BS110aincludes an EPRE ratio manager112. The EPRE ratio manager112may be configured to determine, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource and to receive one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource, in accordance with aspects of the present disclosure. The EPRE ratio manager112may also be configured to determine, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and to receive one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource. As shown inFIG.1, the UE120aincludes an EPRE ratio manager122. The EPRE ratio manager122may be configured to determine, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource and to measure a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource, in accordance with aspects of the present disclosure. The EPRE ratio manager122may also be configured to determine, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and to perform a layer one signal to interference and noise ratio (L1-SINR) measurement without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

FIG.2illustrates example components of BS110aand UE120a(e.g., in the wireless communication network100ofFIG.1), which may be used to implement aspects of the present disclosure.

At the BS110a, a transmit processor220may receive data from a data source212and control information from a controller/processor240. The control information may be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. The data may be for the physical downlink shared channel (PDSCH), etc. A medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes. The MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical sidelink shared channel (PSSCH).

The memories242and282may store data and program codes for BS110aand UE120a, respectively. A scheduler244may schedule UEs for data transmission on the downlink and/or uplink.

Antennas252, processors266,258,264, and/or controller/processor280of the UE120aand/or antennas234, processors220,230,238, and/or controller/processor240of the BS110amay be used to perform the various techniques and methods described herein. For example, as shown inFIG.2, the controller/processor240of the BS110ahas an EPRE ratio manager241that may be configured for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource and for receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource, according to aspects described herein. The EPRE ratio manager241may also be configured for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receiving one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource. As shown inFIG.2, the controller/processor280of the UE120ahas an EPRE ratio manager281that may be configured for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource and for measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource, according to aspects described herein. The EPRE ratio manager281may also be configured for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and performing a layer one signal to interference and noise ratio (L1-SINR) measurement without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource. Although shown at the controller/processor, other components of the UE120aand BS110amay be used to perform the operations described herein.

FIG.3is a diagram showing an example of a frame format300for NR. The transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9. Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, . . . slots) depending on the SCS. Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the SCS. The symbol periods in each slot may be assigned indices. A mini-slot, which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols). Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched. The link directions may be based on the slot format. Each slot may include DL/UL data as well as DL/UL control information.

Example Energy Per Resource Element Ratio for Non-Zero Power Channel State Information Reference Signals

Aspects of the present disclosure provide techniques for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signals (CSI-RSs) when a device is measuring a wireless channel. In previously known techniques (e.g., 3GPP Release 15 (Rel-15)), when an NZP CSI-RS resource is configured on a UE for interference measurement, the UE scales the measurement(s) (e.g., reference signal received power (RSRP)) based on an EPRE ratio associated with the NZP CSI-RS resource. For example, for CSI measurement(s), a UE may assume (1) each NZP CSI-RS port configured for interference measurement corresponds to an interference transmission layer, (2) all interference transmission layers on NZP CSI-RS ports for interference measurement take into account associated EPRE ratios, and (3) other interference signals occur on REs of an NZP CSI-RS resource for channel measurement, REs of an NZP CSI-RS resource for interference measurement, or REs of a CSI interference measurement (CSI-IM) resource for interference measurement. However, there may be two EPRE ratios configured per NZP CSI-RS resource, and thus it is desirable to develop techniques to specify which EPRE ratio a UE uses when measuring an NZP CSI-RS resource. The two EPRE ratios for each NZP CSI-RS resource may be referred to as powerControlOffset and powerControlOffsetSS. In some techniques, powerControlOffset is the assumed ratio of physical downlink shared channel (PDSCH) EPRE to NZP CSI-RS EPRE when a UE derives CSI feedback for the NZP CSI-RS resource. In these techniques, powerControlOffset may have values in the range of [−8, 15] dB with 1 dB step size. In some techniques, powerControlOffsetSS is the assumed ratio of NZP CSI-RS EPRE to synchronization signal or physical broadcast channel (SS/PBCH) block EPRE.

In aspects of the present disclosure, a UE can determine an EPRE ratio to use for an NZP CSI-RS resource and measure a channel based on the determined EPRE ratio and CSI-RSs associated with (e.g., received via resource elements (REs) of) the NZP CSI-RS resource. The UE may determine which EPRE ratio to use when NZP CSI-RS is configured when the NZP CSI-RS is used for a L1-RSRP measurement, when the NZP CSI-RS is used for CSI feedback, including channel quality indicator (CQI), rank indicator (RI), or precoding matrix indicator (PMI), or any metric other than a L1-RSRP or a layer 1 signal-to-interference-and-noise ratio (L1-SINR); or when the NZP CSI-RS is used for a channel measurement resource (CMR), an interference measurement resource (IMR), or for both for an L1-SINR measurement. For each of these cases, a UE may determine whether powerControlOffset or powerControlOffsetSS should be used as the EPRE ratio to scale the RSRP or other measurement measured on the NZP CSI-RS. The UE may make the determination of the EPRE ratio based on a rule(s) in a communications standards or based on an indication from a base station (e.g., a next generation NodeB (gNB)) received, e.g., via radio resource control (RRC) signaling, via a medium access control control element (MAC-CE), or via downlink control information (DCI).

FIG.4is a flow diagram illustrating example operations400for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signals (CSI-RSs) when measuring a wireless channel, in accordance with certain aspects of the present disclosure. The operations400may be performed, for example, by a UE (e.g., such as a UE120ain the wireless communication network100). The operations400may be complementary operations by the UE to the operations500performed by the BS. Operations400may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor280ofFIG.2). Further, the transmission and reception of signals by the UE in operations400may be enabled, for example, by one or more antennas (e.g., antennas252ofFIG.2). In certain aspects, the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor280) obtaining and/or outputting signals.

The operations400may begin, at block405, by determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource.

Operations400may continue, at block410, by measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

According to aspects of the present disclosure, the indication of block405may indicate an EPRE ratio when the NZP CSI-RS resource is for a layer one (L1) reference signal received power (RSRP) measurement, wherein measuring the channel as in block410may include measuring L1-RSRP for the channel.

In aspects of the present disclosure, the indication of block405may indicate an EPRE ratio when the NZP CSI-RS resource is for determining channel state information (CSI) feedback, wherein measuring the channel as in block410may include measuring CSI for the channel.

According to aspects of the present disclosure, the indication of block405may indicate an EPRE ratio when the NZP CSI-RS resource is for use as a channel measurement resource (CMR), an interference measurement resource (IMR), or for a layer one (L1) signal-to-interference-and-noise ratio (SINR) measurement.

In aspects of the present disclosure, a UE performing operations400may receive the indication of block405via a radio resource control (RRC) message.

According to aspects of the present disclosure, a UE performing operations400may receive the indication of block405in a medium access control (MAC) control element (CE).

In aspects of the present disclosure, a UE performing operations400may receive the indication of block405in downlink control information (DCI).

According to aspects of the present disclosure, the indication of block405may include transmission of a synchronization signal block (SSB) during a period of the NZP CSI-RS resource.

In aspects of the present disclosure, the indication of block405may indicate the determined EPRE ratio includes a powerControlOffset.

According to aspects of the present disclosure, the indication of block405may indicate the determined EPRE ratio includes a powerControlOffsetSS.

In aspects of the present disclosure, the indication of block405may include a rule in a wireless communications standard.

According to aspects of the present disclosure, a device performing operations400may measure RSRP for the NZP CSI-RS resource and use the measured RSRP on the NZP CSI-RS resource as a layer one reference signal received power (L1-RSRP) without the RSRP being scaled based on the EPRE ratio for the NZP CSI-RS resource.

In aspects of the present disclosure, a device performing operations400may determine a numerator of a layer one signal to interference and noise ratio (L1-SINR) for the channel as a signal power measured on a channel measurement resource (CMR) associated with the NZP CSI-RS resource without the signal power being scaled based on the EPRE ratio for the NZP CSI-RS resource and determine a denominator of the L1-SINR as a total received power on an interference measurement resource (IMR) associated with the NZP CSI-RS resource without the total received power being scaled based on the EPRE ratio for the NZP CSI-RS resource.

FIG.5is a flow diagram illustrating example operations500for wireless communication, in accordance with certain aspects of the present disclosure. The operations500may be performed, for example, by a BS (e.g., a gNB or the BS110ain the wireless communication network100). The operations500may be complementary operations by the BS to the operations400performed by the UE. Operations500may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor240ofFIG.2). Further, the transmission and reception of signals by the BS in operations500may be enabled, for example, by one or more antennas (e.g., antennas234ofFIG.2). In certain aspects, the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor240) obtaining and/or outputting signals.

The operations500may begin, at block505, by determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource.

Operations500may continue, at block510, by receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource.

According to aspects of the present disclosure, the determination of block505may be based on the NZP CSI-RS resource being for a layer one (L1) reference signal received power (RSRP) measurement, and the measurements of block510may include the L1 RSRP measurement.

In aspects of the present disclosure, the determination of block505may be based on the NZP CSI-RS resource being for determining channel state information (CSI) feedback, and the measurements of block510may include the CSI feedback.

According to aspects of the present disclosure, the determination of block505may be based on the NZP CSI-RS resource being for use as a channel measurement resource (CMR), as an interference measurement resource (IMR), or as a layer one (L1) signal-to-interference-and-noise ratio (SINR) measurement.

In aspects of the present disclosure, a BS performing operations500may transmit an indication of the determined EPRE ratio of block505via a radio resource control (RRC) message.

According to aspects of the present disclosure, a BS performing operations500may transmit an indication of the determined EPRE ratio of block505in a medium access control (MAC) control element (CE).

In aspects of the present disclosure, a BS performing operations500may transmit an indication of the determined EPRE ratio of block505in a downlink control information (DCI).

According to aspects of the present disclosure, the determination of block505may be based on transmission of a synchronization signal block (SSB) during a period of the NZP CSI-RS resource.

In aspects of the present disclosure, a BS performing operations500may schedule a transmission based on the one or more measurements and the determined EPRE.

According to aspects of the present disclosure, a BS performing operations500may configure the NZP CSI-RS resource for a device, wherein the one or more measurements of block510are received from the device.

In aspects of the present disclosure, the determined EPRE ratio of block505may include a powerControlOffset.

According to aspects of the present disclosure, the determined EPRE ratio of block505may include a powerControlOffsetSS.

In aspects of the present disclosure, the determination of block505may be based on a rule in a wireless communications standard.

FIG.6illustrates an exemplary call flow600between a UE605(e.g., UE120a, shown inFIGS.1&2) and a serving gNB (e.g., BS110a, shown inFIGS.1&2). The call flow begins at620with the gNB optionally configuring an NZP CSI-RS resource for the UE. At625, the gNB determines an EPRE ratio for the configured NZP CSI-RS resource, depending on which measurements the NZP CSI-RS resource is used for. At630, the gNB transmits an indication of which EPRE ratio to use for measuring the NZP CSI-RS resource. At635, the UE determines, based on the indication, the EPRE ratio to use for the NZP CSI-RS resource. At640, the UE measures the channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource. At645, the UE transmits and the gNB receives one or more measurements determined based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

FIG.7illustrates a communications device700that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated inFIG.4. The communications device700includes a processing system702coupled to a transceiver708(e.g., a transmitter and/or a receiver). The transceiver708is configured to transmit and receive signals for the communications device700via an antenna710, such as the various signals as described herein. The processing system702may be configured to perform processing functions for the communications device700, including processing signals received and/or to be transmitted by the communications device700.

The processing system702includes a processor704coupled to a computer-readable medium/memory712via a bus706. In certain aspects, the computer-readable medium/memory712is configured to store instructions (e.g., computer-executable code) that when executed by the processor704, cause the processor704to perform the operations illustrated inFIG.4, or other operations for performing the various techniques discussed herein for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signals (CSI-RSs) when a device is measuring a wireless channel. In certain aspects, computer-readable medium/memory712stores code714for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and code716for measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource. In certain aspects, the processor704has circuitry configured to implement the code stored in the computer-readable medium/memory712. The processor704includes circuitry720for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and circuitry722for measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

FIG.8illustrates a communications device800that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated inFIG.5. The communications device800includes a processing system802coupled to a transceiver808(e.g., a transmitter and/or a receiver). The transceiver808is configured to transmit and receive signals for the communications device800via an antenna810, such as the various signals as described herein. The processing system802may be configured to perform processing functions for the communications device800, including processing signals received and/or to be transmitted by the communications device800.

The processing system802includes a processor804coupled to a computer-readable medium/memory812via a bus806. In certain aspects, the computer-readable medium/memory812is configured to store instructions (e.g., computer-executable code) that when executed by the processor804, cause the processor804to perform the operations illustrated inFIG.5, or other operations for performing the various techniques discussed herein for determining an energy per resource element (EPRE) ratio for non-zero power (NZP) channel state information reference signals (CSI-RSs) when a device is measuring a wireless channel. In certain aspects, computer-readable medium/memory812stores code814for determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and code816for receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource. In certain aspects, the processor804has circuitry configured to implement the code stored in the computer-readable medium/memory812. The processor804includes circuitry820for determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and circuitry822for receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource.

According to aspects of the present disclosure, when an NZP CSI-RS resource is used (e.g., by a UE) in L1-SINR measurement as a CMR and/or as an IMR, the configured EPRE ratio parameters associated with the NZP CSI-RS resource may not be used by the UE. Similarly, when an NZP CSI-RS resource is used (e.g., by a UE) in L1-RSRP measurement, the configured EPRE ratio parameters associated with the NZP CSI-RS resource may not be used by the UE. For L1-RSRP measurement, the total measured RSRP on an NZP CSI-RS resource may be reported as the L1-RSRP without being scaled based on an EPRE ratio of the NZP CSI-RS resource. For L1-SINR measurement, the numerator of the reported L1-SINR may be the signal power measured on the CMR without being scaled based on an EPRE ratio of the NZP CSI-RS resource. Also, the denominator (i.e., measure of interference and noise) of the reported L1-SINR may be the total received power measured on the associated IMR without being scaled based on an EPRE ratio of the NZP CSI-RS resource. The EPRE ratio parameters may include powerControlOffset and powerControlOffsetSS.

In aspects of the present disclosure, for CSI measurement(s) other than L1-SINR, a UE may assume: (1) each NZP CSI-RS port configured for interference measurement corresponds to an interference transmission layer; (2) all interference transmission layers on NZP CSI-RS ports for interference measurement take into account an associated EPRE ratio; (3) other interference signals on REs of NZP CSI-RS resource for channel measurement, NZP CSI-RS resource for interference measurement, or CSI-IM resource for interference measurement.

According to aspects of the present disclosure; for L1-SINR measurement(s) with one resource setting, a UE may assume the only other interference signal(s) are on REs of the NZP CSI-RS resource for channel measurement; and for L1-SINR measurement(s) with more than one resource setting, a UE may assume that other interference signal(s) are on REs of the NZP CSI-RS resource for interference measurement or a CSI-IM resource for interference measurement.

FIG.9is a flow diagram illustrating example operations900for measuring NZP CSI-RS without scaling a measured energy based on an EPRE ratio for the NZP CSI-RS resource, in accordance with certain aspects of the present disclosure. The operations900may be performed, for example, by a UE (e.g., such as a UE120ain the wireless communication network100). The operations900may be complementary operations by the UE to the operations1000performed by the BS. Operations900may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor280ofFIG.2). Further, the transmission and reception of signals by the UE in operations900may be enabled, for example, by one or more antennas (e.g., antennas252ofFIG.2). In certain aspects, the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor280) obtaining and/or outputting signals.

The operations900may begin, at block905, by determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource.

Operations900may continue, at block910, by performing a layer one signal to interference and noise ratio (L1-SINR) measurement using at least the NZP CSI-RS resource without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

FIG.10is a flow diagram illustrating example operations1000for receiving measurements of NZP CSI-RS without a measured energy being scaled based on an EPRE ratio for the NZP CSI-RS resource, in accordance with certain aspects of the present disclosure. The operations1000may be performed, for example, by a BS (e.g., a gNB or the BS110ain the wireless communication network100). The operations1000may be complementary operations by the BS to the operations900performed by the UE. Operations1000may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor240ofFIG.2). Further, the transmission and reception of signals by the BS in operations1000may be enabled, for example, by one or more antennas (e.g., antennas234ofFIG.2). In certain aspects, the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor240) obtaining and/or outputting signals.

The operations1000may begin, at block1005, by determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource.

Operations1000may continue, at block1010, by receiving one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource.

FIG.11illustrates a communications device1100that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated inFIG.9. The communications device1100includes a processing system1102coupled to a transceiver1108(e.g., a transmitter and/or a receiver). The transceiver1108is configured to transmit and receive signals for the communications device1100via an antenna1110, such as the various signals as described herein. The processing system1102may be configured to perform processing functions for the communications device1100, including processing signals received and/or to be transmitted by the communications device1100.

The processing system1102includes a processor1104coupled to a computer-readable medium/memory1112via a bus1106. In certain aspects, the computer-readable medium/memory1112is configured to store instructions (e.g., computer-executable code) that when executed by the processor1104, cause the processor1104to perform the operations illustrated inFIG.9, or other operations for performing the various techniques discussed herein for measuring NZP CSI-RS without scaling a measured energy based on an EPRE ratio for the NZP CSI-RS resource. In certain aspects, computer-readable medium/memory1112stores code1114for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and code1116for performing a layer one signal to interference and noise ratio (L1-SINR) measurement using at least the NZP CSI-RS resource without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource. In certain aspects, the processor1104has circuitry configured to implement the code stored in the computer-readable medium/memory1112. The processor1104includes circuitry1120for determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and circuitry1122for performing a layer one signal to interference and noise ratio (L1-SINR) measurement using at least the NZP CSI-RS resource without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

FIG.12illustrates a communications device1200that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated inFIG.10. The communications device1200includes a processing system1202coupled to a transceiver1208(e.g., a transmitter and/or a receiver). The transceiver1208is configured to transmit and receive signals for the communications device1200via an antenna1210, such as the various signals as described herein. The processing system1202may be configured to perform processing functions for the communications device1200, including processing signals received and/or to be transmitted by the communications device1200.

The processing system1202includes a processor1204coupled to a computer-readable medium/memory1212via a bus1206. In certain aspects, the computer-readable medium/memory1212is configured to store instructions (e.g., computer-executable code) that when executed by the processor1204, cause the processor1204to perform the operations illustrated inFIG.10, or other operations for receiving measurements of NZP CSI-RS without a measured energy being scaled based on an EPRE ratio for the NZP CSI-RS resource. In certain aspects, computer-readable medium/memory1212stores code1214for determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and code1216for receiving one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource. In certain aspects, the processor1204has circuitry configured to implement the code stored in the computer-readable medium/memory1212. The processor1204includes circuitry1220for determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and circuitry1222for receiving one or more measurements determined using at least the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource without a measured energy being scaled based on the EPRE ratio for the NZP CSI-RS resource.

Example Aspects of Energy Per Resource Element Ratio for Non-Zero Power Channel State Information Reference Signals

In a first aspect, a method for wireless communications performed by a device in a vehicle, includes: determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and measuring a channel based on the determined EPRE ratio and CSI-RSs associated with the NZP CSI-RS resource.

In a second aspect, in combination with the first aspect, the indication indicates an EPRE ratio when the NZP CSI-RS resource is for a layer one (L1) reference signal received power (RSRP) measurement, and measuring the channel comprises measuring L1-RSRP for the channel.

In a third aspect, in combination with any of the first and second aspects, the indication indicates an EPRE ratio when the NZP CSI-RS resource is for determining channel state information (CSI) feedback and wherein measuring the channel comprises measuring CSI for the channel.

In a fourth aspect, in combination with any of the first through third aspects, the indication indicates an EPRE ratio when the NZP CSI-RS resource is for use as at least one of: a channel measurement resource (CMR), an interference measurement resource (IMR), or a layer one (L1) signal-to-interference-and-noise ratio (SINR) measurement.

In a fifth aspect, in combination with any of the first through fourth aspects, the method includes: receiving the indication via a radio resource control (RRC) message.

In a sixth aspect, in combination with any of the first through fourth aspects, the method includes: receiving the indication in a medium access control (MAC) control element (CE).

In a seventh aspect, in combination with any of the first through fourth aspects, the method includes: receiving the indication in downlink control information (DCI).

In an eighth aspect, in combination with any of the first through seventh aspects, the determined EPRE ratio comprises a powerControlOffset.

In a ninth aspect, in combination with one or more of the first through eighth aspects, the determined EPRE ratio comprises a powerControlOffsetSS.

In a tenth aspect, in combination with any of the first through ninth aspects, the indication comprises a rule in a wireless communications standard.

In an eleventh aspect, in combination with any of the first through tenth aspects, the method includes: measuring reference signal received power (RSRP) for the NZP CSI-RS resource; and using the measured RSRP for the NZP CSI-RS resource as a layer one reference signal received power (L1-RSRP) without the RSRP being scaled based on the EPRE ratio for the NZP CSI-RS resource.

In a twelfth aspect, in combination with any of the first through eleventh aspects, the method includes: determining a numerator of a layer one signal to interference and noise ratio (L1-SINR) for the channel as a signal power measured on a channel measurement resource (CMR) associated with the NZP CSI-RS resource without the signal power being scaled based on the EPRE ratio for the NZP CSI-RS resource; and determining a denominator of the L1-SINR as a total received power on an interference measurement resource (IMR) associated with the NZP CSI-RS resource without the total received power being scaled based on the EPRE ratio for the NZP CSI-RS resource.

In a thirteenth aspect, a method for wireless communication performed by a base station (BS) includes: determining an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and receiving one or more measurements determined based on the EPRE ratio for the NZP CSI-RS resource and CSI-RSs associated with the NZP CSI-RS resource.

In a fourteenth aspect, in combination with the thirteenth aspect, the determination is based on the NZP CSI-RS resource being for a layer one (L1) reference signal received power (RSRP) measurement and wherein the measurements comprise the L1 RSRP measurement.

In a fifteenth aspect, in combination with the thirteenth aspect, the determination is based on the NZP CSI-RS resource being for determining channel state information (CSI) feedback and wherein the measurements comprise the CSI feedback.

In a sixteenth aspect, in combination with the thirteenth aspect, the determination is based on the NZP CSI-RS resource being for use as at least one of: a channel measurement resource (CMR), an interference measurement resource (IMR), or a layer one (L1) signal-to-interference-and-noise ratio (SINR) measurement.

In a seventeenth aspect, in combination with any of the thirteenth through sixteenth aspects, the method includes: transmitting an indication of the determined EPRE ratio via a radio resource control (RRC) message.

In an eighteenth aspect, in combination with any of the thirteenth through sixteenth aspects, the method includes transmitting an indication of the determined EPRE ratio in a medium access control (MAC) control element (CE).

In a nineteenth aspect, in combination with any of the thirteenth through sixteenth aspects, the method includes transmitting an indication of the determined EPRE ratio in downlink control information (DCI).

In a twentieth aspect, in combination with any of the thirteenth through nineteenth aspects, the method includes scheduling a transmission based on the one or more measurements and the determined EPRE ratio.

In a twenty-first aspect, in combination with any of the thirteenth through twentieth aspects, the method includes configuring the NZP CSI-RS resource for a device, wherein the one or more measurements are received from the device.

In a twenty-second aspect, in combination with any of the thirteenth through twenty-first aspects, the determined EPRE ratio comprises a powerControlOffset.

In a twenty-third aspect, in combination with any of the thirteenth through twenty-first aspects, the determined EPRE ratio comprises a powerControlOffsetSS.

In a twenty-fourth aspect, in combination with any of the thirteenth through twenty-third aspects, the determination is based on a rule in a wireless communications standard.

In a twenty-fifth aspect, a method for wireless communications performed by a user equipment (UE), includes: determining, based on an indication, an energy per resource element (EPRE) ratio for a non-zero power (NZP) channel state information reference signal (CSI-RS) resource; and performing a layer one signal to interference and noise ratio (L1-SINR) measurement using at least the NZP CSI-RS resource without scaling a measured energy based on the EPRE ratio for the NZP CSI-RS resource.

In a twenty-sixth aspect, in combination with the twenty-fifth aspect, the EPRE ratio for the NZP CSI-RS resource comprises a powerControlOffsetSS.

In a twenty-seventh aspect, in combination with the twenty-fifth aspect, the EPRE ratio for the NZP CSI-RS resource comprises a powerControlOffset.

In a twenty-eighth aspect, an apparatus for wireless communications includes a memory; and a processor coupled to the memory and configured to perform the method of any of aspects 1-27.

In a twenty-ninth aspects, an apparatus for wireless communications includes means for performing the method of any of aspects 1-27.

In a thirtieth aspect, a computer readable medium stores computer executable code thereon for performing the method of any of aspects 1-27.

Additional Considerations