CSI ENHANCEMENT FOR SBFD CONFIGURATION

A network node may transmit an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at a network node. The RS may include a CSI-RS. The UE may measure the RS from the network node in the symbol or the slot. The UE may generate at least one CSI metric based on the measurement of the RS. The network node may receive a CSI report from the UE based on the RS and at least one CSI metric.

TECHNICAL FIELD

The present disclosure relates generally to communication systems, and more particularly, to channel state measurement and reporting associated with a subband full duplex (SBFD) configuration in a wireless communication system.

Introduction

BRIEF SUMMARY

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE). The apparatus may measure a reference signal (RS) from a network node in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at a network node. The apparatus may generate at least one channel state information (CSI) metric based on the measurement of the RS.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a network node. The apparatus may transmit an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at the network node. The apparatus may receive a CSI report from the UE based on the RS and at least one CSI metric.

DETAILED DESCRIPTION

Full duplex communication where the uplink and downlink communications are in different non-overlapping frequency subbands may be referred to as SBFD or subband frequency division duplexing (FDD). The SBFD operation may be associated with various advantages. For example, an increased uplink duty cycle may lead to latency reduction (e.g., a downlink signal may be received in an otherwise uplink slot, enabling latency savings) and/or uplink coverage improvement. Further, the SBFD operation may enhance the system capacity, resource utilization, and/or spectrum efficiency. Moreover, the SBFD operation may enable flexible and dynamic uplink/downlink resource adaption according to the uplink/downlink traffic in a robust manner. In some configurations, resource allocation may be enhanced in symbols/slots with subbands that the network node may use for the SBFD operation.

According to one or more aspects, a network node may transmit an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at the network node. The UE may measure the RS from the network node in the symbol or the slot. The UE may generate at least one CSI metric based on the measurement of the RS. The network node may receive a CSI report from the UE based on the RS and at least one CSI metric. Accordingly, the accuracy of the reported CSI measurements associated with the SBFD operation may be improved.

Referring again toFIG.1, in certain aspects, the UE104may include a channel state component198that may be configured to measure an RS from a network node in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at a network node. The channel state component198may be configured to generate at least one CSI metric based on the measurement of the RS. In certain aspects, the base station102may include a channel state component199that may be configured to transmit an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at the network node. The channel state component199may be configured to receive a CSI report from the UE based on the RS and at least one CSI metric. Although the following description may be focused on 5G NR or future wireless technologies, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

At least one of the TX processor368, the RX processor356, and the controller/processor359may be configured to perform aspects in connection with the channel state component198ofFIG.1.

Further evolution of the NR duplex operation may see the implementation of such techniques as subband non-overlapping full duplex and/or enhancement on dynamic/flexible TDD. Potential enhancements may be implemented to support the duplex evolution for NR TDD in unpaired spectrum. In some configurations, duplex enhancement may be implemented at the network node (e.g., base station) side, while the UE side may continue to use the half duplex operation. There may or may not be restriction on frequency ranges when the techniques are implemented.

To implement subband non-overlapping full duplex and/or enhancement on dynamic/flexible TDD, inter-network node and/or inter-UE cross link interference (CLI) may be handled and managed. Further, for the subband non-overlapping full duplex, intra-subband CLI and/or inter-subband CLI may also be considered. The impact on RF specifications caused by the self-interference, the inter-subband CLI, and the inter-operator CLI at the network node side, and the inter-subband CLI and the inter-operator CLI at the UE side may also be considered. Moreover, the impact of the above techniques on the legacy operation assuming their coexistence on co-channel or adjacent channels may also be considered.

Full duplex communication (i.e., transmission and reception at the same time) may be in a same frequency band. In additional configurations, the uplink and downlink communications may be in different non-overlapping frequency subbands, in the same frequency subbands, or in partially overlapping frequency subbands. In particular, the full duplex communication where the uplink and downlink communications are in different non-overlapping frequency subbands may be referred to as SBFD or subband FDD.

FIG.4is an example diagram400illustrating the operation of SBFD according to one or more aspects of the disclosure. As shown, the diagram410may illustrate an example environment in which the SBFD may operate. The diagram420may illustrate example time-frequency resource allocation associated with the SBFD operation. The example diagram420shows two downlink subbands422and426that are separated by an uplink subband424. Accordingly, the downlink subbands422and426may be referred to as non-contiguous downlink subbands. In some configurations, there may be a guard band (not shown) between the downlink subband422and the uplink subband424and/or between the uplink subband424and the downlink subband426. The use of a guard band between an uplink subband and a downlink subband may help to reduce self-interference (SI).

In the example shown, during an SBFD slot428, the network node402may operate in the full duplex mode on a subband basis based on the SBFD operation, while the UE404and the UE406may operate in the half duplex mode. In particular, the network node402may transmit to the UE404using the downlink beam412and the downlink subband(s) of the component carrier bandwidth (e.g., one or both of the downlink subbands422and426). Simultaneously (at the same time as the downlink transmissions), the network node402may receive from the UE406using the uplink beam414and the uplink subband(s) of the component carrier bandwidth (e.g., the uplink subband424).

Due to the SBFD operation as shown, the downlink transmission by the network node402via the downlink beam412may cause self-interference to the uplink reception by the network node402via the uplink beam414. Further, clutter reflections (e.g., due to the presence of the obstacle408in the environment) may also cause interference to the SBFD operation.

The SBFD operation may be associated with various advantages. For example, an increased uplink duty cycle may lead to latency reduction (e.g., a downlink signal may be received in an otherwise uplink slot, enabling latency savings) and/or uplink coverage improvement. Further, the SBFD operation may enhance the system capacity, resource utilization, and/or spectrum efficiency. Moreover, the SBFD operation may enable flexible and dynamic uplink/downlink resource adaption according to the uplink/downlink traffic in a robust manner.

In some configurations, the UE(s) (e.g., the UEs404/406) may be informed of the time and/or frequency location of the subbands that the network node (e.g., the network node402) may use for the SBFD operation. In some configurations, resource allocation may be enhanced in symbols/slots with subbands that the network node may use for the SBFD operation.

Some aspects of the disclosure may relate to the CSI enhancement for the SBFD operation.FIG.5is an example diagram500illustrating the transmission of the CSI-RS in association with the SBFD operation according to one or more aspects of the disclosure. As shown, symbols/slots502a-c(i.e.,502a,502b, and502c) may be half duplex symbols/slots. In particular, the symbols/slots502a-cmay be downlink symbols/slots. Further, symbols/slots502d-f(i.e.,502d,502e, and5020may be SBFD symbols/slots. In particular, in symbols/slots502d-f, subbands504and508may be downlink subbands and the subband506may be an uplink subband. The two downlink subbands504and508may be non-contiguous downlink subbands as the two downlink subbands504and508are separated by the uplink subband506. The CSI-RS may be transmitted and measured in either SBFD symbols/slots (in particular, in the downlink subbands) or half duplex downlink symbols/slots. As shown, the CSI-RS may be transmitted and measured in the half duplex downlink symbols/slots502a-cas well as in the non-contiguous downlink subbands504and508within the SBFD symbols/slots502d-f. Some configurations may relate to techniques for enhancing the CSI measurement accuracy in non-contiguous downlink subbands (e.g., downlink subbands on the sides of the bandwidth that are separated by an uplink subband) in SBFD symbols/slots.

In one or more configurations, the network node (e.g., the network node402) may transmit the CSI-RS with the same total transmit power across half duplex downlink symbols/slots (e.g., symbols/slots502a-c) and SBFD symbols/slots (e.g., symbols/slots502d-f). Because the SBFD symbols/slots may include uplink subbands where the network node may not transmit any power, on a per-CSI subband basis, the network node may increase (boost) the transmit power of the CSI-RS on the downlink subbands in SBFD symbols/slots (e.g., the downlink subbands504and508in the SBFD symbols/slots502d-f), while keeping the total transmit power across the whole bandwidth (e.g., the component carrier bandwidth) the same. For example, on a per-CSI subband basis, the network node may increase the transmit power of the CSI-RS on the downlink subbands in SBFD symbols/slots by x dB.

Because the transmit power of the CSI-RS on the downlink subbands in SBFD symbols/slots may be increased, the UE may increase (boost) the measured CSI metric accordingly. For example, if the network node increases the transmit power of the CSI-RS on the downlink subbands in SBFD symbols/slots by x dB and the measured CSI metric is the reference signal received power (RSRP) (e.g., Layer 1-RSRP (L1-RSRP)), the UE may increase the measured RSRP by x dB as well. In other configurations, the UE may make similar adaptations to other CSI metrics such as the received signal strength indicator (RSSI), the CQI, or the pathloss RS.

In one or more configurations, for the SBFD symbols/slots, the UE may measure the CSI-RS transmitted in downlink subbands (e.g., non-contiguous downlink subbands). In one configuration, if the UE is configured to send a per-CSI subband CSI report, the CSI subbands in the per-CSI subband CSI report may be configurable, and at least some CSI subbands may each be narrower than each of the downlink subbands in SBFD symbols/slots for the SBFD operation (e.g., narrower CSI subbands may help with the identification of whether edge RBs/subcarriers in an SBFD subband suffer from significant interference as edge RBs/subcarriers in an SBFD subband may be covered by a separate CSI subband for separate CSI reporting). Accordingly, when generating the per-CSI subband CSI metrics, the UE may skip the reporting of the subbands associated with the uplink (e.g., the uplink subband506in the middle of the bandwidth) for the SBFD operation. As a result, the reported CSI measurement associated with the SBFD operation may be more accurate.

In one configuration, if the UE is configured to send a wideband CSI report, the UE may skip the processing of the CSI on the uplink subband (e.g., the uplink subband506) (e.g., the UE may refrain from receiving and/or refrain from measuring the CSI-RS resource in the uplink subband) for the SBFD operation when calculating the wideband CSI metrics. As a result, the reported CSI measurement associated with the SBFD operation may be more accurate.

FIG.6is a diagram of an example communication flow600of a method of wireless communication. The UE602may correspond to the UE404inFIG.4. The UE602′ may correspond to the UE406inFIG.4. Further, the network node604may correspond to the network node402inFIG.4. At606, the network node604may transmit an RS to the UE602in a symbol or a slot. Accordingly, the UE602may receive the RS from the network node604in the symbol or the slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot (e.g., the downlink subbands422/426/504/508). At least two downlink subbands (e.g., the downlink subbands422/426or504/508) in the plurality of downlink subbands may be separated by an uplink subband (e.g., the uplink subband424or506) in the symbol or the slot.

At the same time as606, at614, the network node604may receive an uplink communication from the UE602′ (e.g., over the uplink subband (e.g., the uplink subband424or506) in the symbol or the slot).

In one configuration, the RS at606may include a CSI-RS.

In one configuration, on a per-CSI subband basis, compared to the transmit power used in a half duplex downlink slot, the network node604may increase the transmit power of the RS on the downlink subbands. In other words, the network node604may transmit the RS in the at least one downlink subband in the plurality of downlink subbands in the symbol or the slot with a first (increased) transmit power. The first transmit power may be greater than a second transmit power associated with a second RS in a second symbol or a second slot (e.g., a half duplex downlink slot). The second symbol or the second slot may be associated with a half duplex operation (e.g., a legacy half duplex operation) at the network node. The second symbol or the second slot may include no uplink subbands.

In one configuration, the RS at606may be transmitted and received via a first preconfigured CSI-RS resource in the symbol or the slot. The first preconfigured CSI-RS resource may be associated with the subband full duplex operation at the network node604. The second RS may be transmitted and received via a second preconfigured CSI-RS resource in the second symbol or the second slot. The second preconfigured CSI-RS resource may be associated with the half duplex operation at the network node604.

At608, the UE602may measure the RS from the network node604in the symbol or the slot.

At610, the UE602may generate at least one CSI metric based on the measurement, at608, of the RS. Examples of the CSI metric may include the SRS-RSRP or the CLI-RSSI.

In one or more configurations, the at least one CSI metric may include at least one of an RSRP, an RSSI, a CQI, or a pathloss RS.

In one configuration, where the network node604increases, on a per-CSI subband basis, the transmit power of the RS on the downlink subbands, the UE602may generate the at least one CSI metric further based on the first (increased) transmit power associated with the RS in the at least one downlink subband in the plurality of downlink subbands in the symbol or the slot.

At612, the UE602may transmit a CSI report to the network node604based on the at least one CSI metric. Accordingly, the network node604may receive the CSI report from the UE602based on the at least one CSI metric.

In one configuration, where the CSI report includes a per-CSI subband CSI report (i.e., the UE602is configured to send a per-CSI subband CSI report), the per-CSI subband CSI report may be associated with skipping the uplink subband associated with the subband full duplex operation at the network node.

In one configuration, where the CSI report include a wideband CSI report (i.e., the UE602is configured to send a wideband CSI report), the wideband CSI report may be based on refraining by the UE602from processing CSI on the uplink subband.

FIG.7is a flowchart700of a method of wireless communication. The method may be performed by a UE (e.g., the UE104/350/404/602; the apparatus1004). At702, the UE may measure an RS from a network node in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at a network node. For example,702may be performed by the component198inFIG.10. Referring toFIG.6, at608, the UE602may measure an RS from a network node604in a symbol or a slot.

At704, the UE may generate at least one CSI metric based on the measurement of the RS. For example,704may be performed by the component198inFIG.10. Referring toFIG.6, at610, the UE602may generate at least one CSI metric based on the measurement, at608, of the RS.

FIG.8is a flowchart800of a method of wireless communication. The method may be performed by a UE (e.g., the UE104/350/404/602; the apparatus1004). At804, the UE may measure an RS from a network node in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at a network node. For example,804may be performed by the component198inFIG.10. Referring toFIG.6, at608, the UE602may measure an RS from a network node604in a symbol or a slot.

At806, the UE may generate at least one CSI metric based on the measurement of the RS. For example,806may be performed by the component198inFIG.10. Referring toFIG.6, at610, the UE602may generate at least one CSI metric based on the measurement, at608, of the RS.

In one configuration, referring toFIG.6, the RS at606may include a CSI-RS.

In one configuration, the at least one CSI metric may include at least one of an RSRP, an RSSI, a CQI, or a pathloss RS.

In one configuration, referring toFIG.6, the at least one CSI metric may be generated at610further based on a first transmit power associated with the RS at606in at least one downlink subband in the plurality of downlink subbands in the symbol or the slot. The first transmit power associated with the RS at606in the at least one downlink subband in the symbol or the slot may be greater than a second transmit power associated with a second RS in a second symbol or a second slot. The second symbol or the second slot may be associated with a half duplex operation at the network node. The second symbol or the second slot may include no uplink subbands.

In one configuration, referring toFIG.6, The RS at606may be received via a first preconfigured CSI-RS resource in the symbol or the slot. The first preconfigured CSI-RS resource may be associated with the subband full duplex operation at the network node604. The second RS may be received via a second preconfigured CSI-RS resource in the second symbol or the second slot. The second preconfigured CSI-RS resource may be associated with the half duplex operation at the network node604.

In one configuration, at808, the UE may transmit a CSI report to the network node based on the at least one CSI metric. For example,808may be performed by the component198inFIG.10. Referring toFIG.6, at612, the UE602may transmit a CSI report to the network node604based on the at least one CSI metric.

In one configuration, referring toFIG.6, the CSI report at612may include a per-CSI subband CSI report. The per-CSI subband CSI report may be associated with skipping the uplink subband associated with the subband full duplex operation at the network node.

In one configuration, referring toFIG.6, the CSI report at612may include a wideband CSI report. The wideband CSI report may be based on refraining from processing CSI on the uplink subband associated with the subband full duplex operation at the network node.

In one configuration, at802, the UE may receive the RS from the network node in the symbol or the slot. The RS may be measured based on being received in the symbol or the slot. For example,802may be performed by the component198inFIG.10. Referring toFIG.6, at606, the UE602may receive the RS from the network node604in the symbol or the slot.

FIG.9is a flowchart900of a method of wireless communication. The method may be performed by a base station/network node (e.g., the base station102/310; the network node402/604; the network entity1002). At902, the network node may transmit an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at the network node. For example,902may be performed by the component199inFIG.11. Referring toFIG.6, at606, the network node604may transmit an RS to a UE602in a symbol or a slot.

At904, the network node may receive a CSI report from the UE based on the RS and at least one CSI metric. For example,904may be performed by the component199inFIG.11. Referring toFIG.6, at612, the network node604may receive a CSI report from the UE602based on the RS at606and at least one CSI metric.

In one configuration, referring toFIG.6, the RS at606may include a CSI-RS.

In one configuration, the at least one CSI metric may include at least one of an RSRP, an RSSI, a CQI, or a pathloss RS.

In one configuration, referring toFIG.6, the RS at606may be transmitted in at least one downlink subband in the plurality of downlink subbands in the symbol or the slot with a first transmit power. The first transmit power associated with the RS at606in the at least one downlink subband in the symbol or the slot may be greater than a second transmit power associated with a second RS in a second symbol or a second slot. The second symbol or the second slot may be associated with a half duplex operation at the network node. The second symbol or the second slot may include no uplink subbands. The at least one CSI metric may be based on the RS at606and the first transmit power.

In one configuration, referring toFIG.6, the network node604may configure a first CSI-RS resource and a second CSI-RS resource. The RS at606may be transmitted by the network node604via the first (preconfigured) CSI-RS resource in the symbol or the slot. The first (preconfigured) CSI-RS resource may be associated with the subband full duplex operation at the network node604. The second RS may be transmitted by the network node604via a second (preconfigured) CSI-RS resource in the second symbol or the second slot. The second (preconfigured) CSI-RS resource may be associated with the half duplex operation at the network node604.

In one configuration, referring toFIG.6, the CSI report at612may include a per-CSI subband CSI report. The per-CSI subband CSI report may be associated with skipping the uplink subband associated with the subband full duplex operation at the network node.

In one configuration, referring toFIG.6, the CSI report at612may include a wideband CSI report. The wideband CSI report may be based on refraining from processing CSI on the uplink subband associated with the subband full duplex operation at the network node.

FIG.10is a diagram1000illustrating an example of a hardware implementation for an apparatus1004. The apparatus1004may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus1004may include a cellular baseband processor1024(also referred to as a modem) coupled to one or more transceivers1022(e.g., cellular RF transceiver). The cellular baseband processor1024may include on-chip memory1024′. In some aspects, the apparatus1004may further include one or more subscriber identity modules (SIM) cards1020and an application processor1006coupled to a secure digital (SD) card1008and a screen1010. The application processor1006may include on-chip memory1006′. In some aspects, the apparatus1004may further include a Bluetooth module1012, a WLAN module1014, an SPS module1016(e.g., GNSS module), one or more sensor modules1018(e.g., barometric pressure sensor/altimeter; motion sensor such as inertial measurement unit (IMU), gyroscope, and/or accelerometer(s); light detection and ranging (LIDAR), radio assisted detection and ranging (RADAR), sound navigation and ranging (SONAR), magnetometer, audio and/or other technologies used for positioning), additional memory modules1026, a power supply1030, and/or a camera1032. The Bluetooth module1012, the WLAN module1014, and the SPS module1016may include an on-chip transceiver (TRX) (or in some cases, just a receiver (RX)). The Bluetooth module1012, the WLAN module1014, and the SPS module1016may include their own dedicated antennas and/or utilize the antennas1080for communication. The cellular baseband processor1024communicates through the transceiver(s)1022via one or more antennas1080with the UE104and/or with an RU associated with a network entity1002. The cellular baseband processor1024and the application processor1006may each include a computer-readable medium/memory1024′,1006′, respectively. The additional memory modules1026may also be considered a computer-readable medium/memory. Each computer-readable medium/memory1024′,1006′,1026may be non-transitory. The cellular baseband processor1024and the application processor1006are each responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the cellular baseband processor1024/application processor1006, causes the cellular baseband processor1024/application processor1006to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the cellular baseband processor1024/application processor1006when executing software. The cellular baseband processor1024/application processor1006may be a component of the UE350and may include the memory360and/or at least one of the TX processor368, the RX processor356, and the controller/processor359. In one configuration, the apparatus1004may be a processor chip (modem and/or application) and include just the cellular baseband processor1024and/or the application processor1006, and in another configuration, the apparatus1004may be the entire UE (e.g., see350ofFIG.3) and include the additional modules of the apparatus1004.

As discussed supra, the component198is configured to measure an RS from a network node in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at a network node. The component198is configured to generate at least one CSI metric based on the measurement of the RS. The component198may be within the cellular baseband processor1024, the application processor1006, or both the cellular baseband processor1024and the application processor1006. The component198may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. As shown, the apparatus1004may include a variety of components configured for various functions. In one configuration, the apparatus1004, and in particular the cellular baseband processor1024and/or the application processor1006, includes means for measuring an RS from a network node in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at a network node. The apparatus1004, and in particular the cellular baseband processor1024and/or the application processor1006, includes means for generating at least one CSI metric based on the measurement of the RS.

In one configuration, the RS may include a CSI-RS. In one configuration, the at least one CSI metric may include at least one of an RSRP, an RSSI, a CQI, or a pathloss RS. In one configuration, the at least one CSI metric may be generated further based on a first transmit power associated with the RS in at least one downlink subband in the plurality of downlink subbands in the symbol or the slot. The first transmit power associated with the RS in the at least one downlink subband in the symbol or the slot may be greater than a second transmit power associated with a second RS in a second symbol or a second slot. The second symbol or the second slot may be associated with a half duplex operation at the network node. The second symbol or the second slot may include no uplink subbands. In one configuration, the RS may be received via a first preconfigured CSI-RS resource in the symbol or the slot. The first preconfigured CSI-RS resource may be associated with the subband full duplex operation at the network node. The second RS may be received via a second preconfigured CSI-RS resource in the second symbol or the second slot. The second preconfigured CSI-RS resource may be associated with the half duplex operation at the network node. In one configuration, the apparatus1004, and in particular the cellular baseband processor1024and/or the application processor1006, includes means for transmitting a CSI report to the network node based on the at least one CSI metric. In one configuration, the CSI report may include a per-CSI subband CSI report. The per-CSI subband CSI report may be associated with skipping the uplink subband associated with the subband full duplex operation at the network node. In one configuration, the CSI report may include a wideband CSI report. The wideband CSI report may be based on refraining from processing CSI on the uplink subband associated with the subband full duplex operation at the network node. In one configuration, the apparatus1004, and in particular the cellular baseband processor1024and/or the application processor1006, includes means for receiving the RS from the network node in the symbol or the slot. The RS may be measured based on being received in the symbol or the slot.

The means may be the component198of the apparatus1004configured to perform the functions recited by the means. As described supra, the apparatus1004may include the TX processor368, the RX processor356, and the controller/processor359. As such, in one configuration, the means may be the TX processor368, the RX processor356, and/or the controller/processor359configured to perform the functions recited by the means.

FIG.11is a diagram1100illustrating an example of a hardware implementation for a network entity1102. The network entity1102may be a BS, a component of a BS, or may implement BS functionality. The network entity1102may include at least one of a CU1110, a DU1130, or an RU1140. For example, depending on the layer functionality handled by the component199, the network entity1102may include the CU1110; both the CU1110and the DU1130; each of the CU1110, the DU1130, and the RU1140; the DU1130; both the DU1130and the RU1140; or the RU1140. The CU1110may include a CU processor1112. The CU processor1112may include on-chip memory1112′. In some aspects, the CU1110may further include additional memory modules1114and a communications interface1118. The CU1110communicates with the DU1130through a midhaul link, such as an F1 interface. The DU1130may include a DU processor1132. The DU processor1132may include on-chip memory1132′. In some aspects, the DU1130may further include additional memory modules1134and a communications interface1138. The DU1130communicates with the RU1140through a fronthaul link. The RU1140may include an RU processor1142. The RU processor1142may include on-chip memory1142′. In some aspects, the RU1140may further include additional memory modules1144, one or more transceivers1146, antennas1180, and a communications interface1148. The RU1140communicates with the UE104. The on-chip memory1112′,1132′,1142′ and the additional memory modules1114,1134,1144may each be considered a computer-readable medium/memory. Each computer-readable medium/memory may be non-transitory. Each of the processors1112,1132,1142is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the corresponding processor(s) causes the processor(s) to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the processor(s) when executing software.

As discussed supra, the component199is configured to transmit an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at the network node. The component199is configured to receive a CSI report from the UE based on the RS and at least one CSI metric. The component199may be within one or more processors of one or more of the CU1110, DU1130, and the RU1140. The component199may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. The network entity1102may include a variety of components configured for various functions. In one configuration, the network entity1102includes means for transmitting an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at the network node. The network entity1102includes means for receiving a CSI report from the UE based on the RS and at least one CSI metric.

In one configuration, the RS may include a CSI-RS. In one configuration, the at least one CSI metric may include at least one of an RSRP, an RSSI, a CQI, or a pathloss RS. In one configuration, the RS may be transmitted in at least one downlink subband in the plurality of downlink subbands in the symbol or the slot with a first transmit power. The first transmit power associated with the RS in the at least one downlink subband in the symbol or the slot may be greater than a second transmit power associated with a second RS in a second symbol or a second slot. The second symbol or the second slot may be associated with a half duplex operation at the network node. The second symbol or the second slot may include no uplink subbands. The at least one CSI metric may be based on the RS and the first transmit power. In one configuration, the network entity1102includes means for configuring a first CSI-RS resource and a second CSI-RS resource. The first CSI-RS resource may be associated with the subband full duplex operation at the network node. The second CSI-RS resource may be associated with the half duplex operation at the network node. The RS may be transmitted via the first CSI-RS resource in the symbol or the slot. The second RS may be transmitted via the second CSI-RS resource in the second symbol or the second slot. In one configuration, the CSI report may include a per-CSI subband CSI report. The per-CSI subband CSI report may be associated with skipping the uplink subband associated with the subband full duplex operation at the network node. In one configuration, the CSI report may include a wideband CSI report. The wideband CSI report may be based on refraining from processing CSI on the uplink subband associated with the subband full duplex operation at the network node.

The means may be the component199of the network entity1102configured to perform the functions recited by the means. As described supra, the network entity1102may include the TX processor316, the RX processor370, and the controller/processor375. As such, in one configuration, the means may be the TX processor316, the RX processor370, and/or the controller/processor375configured to perform the functions recited by the means.

Referring back toFIGS.4-11, a network node may transmit an RS to a UE in a symbol or a slot. The RS may extend over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot. At least two downlink subbands in the plurality of downlink subbands may be separated by an uplink subband in the symbol or the slot. The plurality of downlink subbands and the uplink subband may be associated with a subband full duplex operation at the network node. The UE may measure the RS from the network node in the symbol or the slot. The UE may generate at least one CSI metric based on the measurement of the RS. The network node may receive a CSI report from the UE based on the RS and at least one CSI metric. Accordingly, the accuracy of the reported CSI measurements associated with the SBFD operation may be improved.

Aspect 1 is a method of wireless communication at a UE, including measuring an RS from a network node in a symbol or a slot, the RS extending over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot, where at least two downlink subbands in the plurality of downlink subbands are separated by an uplink subband in the symbol or the slot, and the plurality of downlink subbands and the uplink subband are associated with a subband full duplex operation at a network node; and generating at least one CSI metric based on the measurement of the RS.

Aspect 2 is the method of aspect 1, where the RS includes a CSI-RS.

Aspect 3 is the method of any of aspects 1 and 2, where the at least one CSI metric includes at least one of an RSRP, an RSSI, a CQI, or a pathloss RS.

Aspect 4 is the method of any of aspects 1 to 3, where the at least one CSI metric is generated further based on a first transmit power associated with the RS in at least one downlink subband in the plurality of downlink subbands in the symbol or the slot, where the first transmit power associated with the RS in the at least one downlink subband in the symbol or the slot is greater than a second transmit power associated with a second RS in a second symbol or a second slot, where the second symbol or the second slot is associated with a half duplex operation at the network node, and where the second symbol or the second slot includes no uplink subbands.

Aspect 5 is the method of aspect 4, where the RS is received via a first preconfigured CSI-RS resource in the symbol or the slot, the first preconfigured CSI-RS resource is associated with the subband full duplex operation at the network node, the second RS is received via a second preconfigured CSI-RS resource in the second symbol or the second slot, and the second preconfigured CSI-RS resource is associated with the half duplex operation at the network node.

Aspect 6 is the method of any of aspects 1 to 5, further including: transmitting a CSI report to the network node based on the at least one CSI metric.

Aspect 7 is the method of aspect 6, where the CSI report includes a per-CSI subband CSI report, and the per-CSI subband CSI report is associated with skipping the uplink subband associated with the subband full duplex operation at the network node.

Aspect 8 is the method of aspect 6, where the CSI report includes a wideband CSI report, and the wideband CSI report is based on refraining from processing CSI on the uplink subband associated with the subband full duplex operation at the network node.

Aspect 9 is the method of any of aspects 1 to 8, further including: receiving the RS from the network node in the symbol or the slot, where the RS is measured based on being received in the symbol or the slot.

Aspect 10 is a method of wireless communication at a network node, including transmitting an RS to a UE in a symbol or a slot, the RS extending over a plurality of downlink subbands that have non-contiguous subcarriers in the symbol or the slot, where at least two downlink subbands in the plurality of downlink subbands are separated by an uplink subband in the symbol or the slot, and the plurality of downlink subbands and the uplink subband are associated with a subband full duplex operation at the network node; and receiving a CSI report from the UE based on the RS and at least one CSI metric.

Aspect 11 is the method of aspect 10, where the RS includes a CSI-RS.

Aspect 12 is the method of any of aspects 10 and 11, where the at least one CSI metric includes at least one of an RSRP, an RSSI, a CQI, or a pathloss RS.

Aspect 13 is the method of any of aspects 10 to 12, where the RS is transmitted in at least one downlink subband in the plurality of downlink subbands in the symbol or the slot with a first transmit power, where the first transmit power associated with the RS in the at least one downlink subband in the symbol or the slot is greater than a second transmit power associated with a second RS in a second symbol or a second slot, where the second symbol or the second slot is associated with a half duplex operation at the network node, where the second symbol or the second slot includes no uplink subbands, and where the at least one CSI metric is based on the RS and the first transmit power.

Aspect 14 is the method of aspect 13, further including: configuring a first CSI-RS resource and a second CSI-RS resource, where the first CSI-RS resource is associated with the subband full duplex operation at the network node, and the second CSI-RS resource is associated with the half duplex operation at the network node, and where the RS is transmitted via the first CSI-RS resource in the symbol or the slot, and the second RS is transmitted via the second CSI-RS resource in the second symbol or the second slot.

Aspect 15 is the method of any of aspects 10 to 14, where the CSI report includes a per-CSI subband CSI report, and the per-CSI subband CSI report is associated with skipping the uplink subband associated with the subband full duplex operation at the network node.

Aspect 16 is the method of any of aspects 10 to 15, where the CSI report includes a wideband CSI report, and the wideband CSI report is based on refraining from processing CSI on the uplink subband associated with the subband full duplex operation at the network node.

Aspect 17 is an apparatus for wireless communication including at least one processor coupled to a memory and, based at least in part on information stored in the memory, the at least one processor is configured to implement a method as in any of aspects 1 to 16.

Aspect 18 may be combined with aspect 17 and further includes a transceiver coupled to the at least one processor.

Aspect 19 is an apparatus for wireless communication including means for implementing any of aspects 1 to 16.

Aspect 20 is a non-transitory computer-readable storage medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 to 16.

Various aspects have been described herein. These and other aspects are within the scope of the following claims.