Dynamic PDSCH power allocation

Abstract

The present disclosure enables dynamic transmission power allocation for a physical downlink shared channel (PDSCH) (118). A network entity (104) may send a channel state information (CSI) report configuration (106) to a UE (102), the channel state information (CSI) report configuration configuring the UE (102) to provide a power back-off indicator (PBI) report (116). The CSI report (112) may be modified to include the PBI report (116). The UE may determine one or more PBIs based on a measured signal to interference plus noise ratio (SINR) measured for one or more CSI reference signal (CSI-RS) resources. The network entity (104) receives a PBI report (116) from the UE (102) and sets a PDSCH transmission power using one or more PBIs in the PBI report (116). The network entity (104) may send control signaling indicating the transmit power, power offset, or additional power back-off of the PDSCH.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communications and to power allocation for a Physical Downlink Shared Channel (PDSCH) based on channel conditions in a wireless communication system. Background Art

[0002] Wireless communication systems use a physical downlink shared channel (PDSCH) to send data from a network entity (such as a base station) to a user equipment (UE). Typically, the network entity allocates power to the PDSCH based on the CSI obtained by the network entity from the UE in a channel state information (CSI) report. To enable CSI measurement, the network entity configures and sends a reference signal for the UE to measure. For example, the network entity may configure the CSI report through radio resource control (RRC) signaling (such as the CSI-ReportConfig information element in an RRC message). RRC signaling configures a channel state information reference signal (CSI-RS), which is used as a channel measurement resource (CMR) for the UE to measure the downlink channel. Additionally, the network entity may configure an interference measurement resource (IMR) for the UE to measure interference. Based on the configured CMR and IMR, the UE may measure the channel conditions and determine the CSI. The CSI may include at least one of a rank indicator (RI), a precoder matrix indicator (PMI), a channel quality indicator (CQI), or a layer indicator (LI). RI and PMI are used to indicate the digital precoder. CQI is used to indicate the signal to interference plus noise ratio (SINR) status to help network entities determine the modulation and coding scheme (MCS). LI is used to identify the strongest layer for the reported precoder indicated by RI and PMI. The 3rd Generation Partnership Project (3GPP) standardization organization has defined CSI measurement procedures and CSI reporting in technical specification (TS) standard documents. For example, 3GPP TS 38.212 defines CSI reporting on PUCCH, 3GPP TS 38.212 defines CSI reporting on PUSCH, 3GPP TS 38.214 defines procedures for CQI measurement and reporting, and 3GPP TS 38.214 defines the configuration of CSI-RS resources.

[0003] The current procedure for PDSCH power allocation is based on the CQI reported by the UE. The UE measures the CMR and IMR to determine the measured signal to interference plus noise ratio (SINR). The UE determines the CQI based on the measured SINR and a predefined target spectral efficiency (SE). The CSI report includes the CQI, which the network entity uses to determine the transmit power (or transmit power backoff) for the PDSCH. However, there may be situations where the network entity can support an acceptable quality of service on the PDSCH while using a lower transmit power that would normally be selected for a particular CQI. Currently, there is no mechanism for the UE to inform the network entity when the CQI can support a lower transmit power, and there is no mechanism for the network entity to configure a lower transmit power. Summary of the Invention

[0004] The systems, methods, and devices of the present disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.

[0005] One innovative aspect of the subject matter described in the present disclosure can be implemented as a method of wireless communication at a user equipment (UE). The method includes: receiving, via control signaling from a network entity, a CSI reporting configuration indicating at least one channel state information (CSI) reference signal (CSI-RS) resource and including a power backoff indicator (PBI) reporting configuration; receiving the at least one CSI-RS resource; generating a PBI report, the PBI report including one or more power backoff indicators (PBIs) based on measurements of the at least one CSI-RS resource and the PBI reporting configuration; and sending the PBI report from the UE to the network entity in a CSI report.

[0006] Another innovative aspect of the subject matter described in the present disclosure can be implemented as a method of wireless communication at a network entity, such as a base station, including: sending a CSI reporting configuration indicating at least one channel state information (CSI) reference signal (CSI-RS) resource and including a power backoff indicator (PBI) reporting configuration to a user equipment (UE) via control signaling; sending the at least one CSI-RS resource; and receiving a CSI report from the UE, the CSI report including a PBI report including one or more power backoff indicators (PBIs).

[0007] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus (such as a UE or a network entity). The apparatus includes a communication unit and a processing system. The processing system is configured to control the communication unit to implement any of the above methods.

[0008] The details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Note that the relative sizes of the following figures may not be drawn to scale. In the various drawings, like reference numerals and names indicate like elements.

[0010] Figure 1 An example of a user equipment (UE) and a network entity is shown, illustrating power allocation for a physical downlink shared channel (PDSCH), according to some aspects of the present disclosure.

[0011] Figure 2 Example signal-to-interference-plus-noise ratio (SINR) measurements and reported channel quality indicators (CQIs) are shown.

[0012] Figure 3A An example CQI reporting profile from a system-level simulation is shown.

[0013] Figure 3B An example for a geometric SINR distribution map from a system-level simulation is shown.

[0014] Figure 4 Example message flows and procedures are shown in which a channel state information (CSI) report includes a power backoff indicator (PBI) report.

[0015] Figure 5 Example message flows and procedures are shown where CSI reporting includes PBI reporting based on CQI subset restriction.

[0016] Figure 6 An example message flow and procedure is shown in which a CSI report includes a PBI report based on a target spectral efficiency.

[0017] Figure 7

[0046] An example procedure for a UE supporting PBI reporting according to some aspects of the present disclosure is shown.

[0018] Figure 8 An example process for a network entity supporting PBI reporting according to some aspects of the present disclosure is shown.

[0019] Figure 9 An example PBI report in the short physical uplink control channel (PUCCH) is shown.

[0020] Figure 10A An example PBI report in CSI part 1 in the long PUCCH or Physical Uplink Shared Channel (PUSCH) is shown.

[0021] Figure 10B An example PBI report in CSI part 2 in long PUCCH or PUSCH is shown.

[0022] Figure 10C Example PBI reporting in CSI part 1 and CSI part 2 in long PUCCH or PUSCH is shown.

[0023] Figure 11 An example PBI report based on multiple candidate power offsets is shown.

[0024] Figure 12 Example PBI reporting based on multiple CSI-RS resources with different power offsets is shown.

[0025] Figure 13 A first example message flow and procedure for dynamic PDSCH power allocation according to some aspects of the present disclosure is shown.

[0026] Figure 14 A second example message flow and procedure for dynamic PDSCH power allocation according to some aspects of the present disclosure is shown.

[0027] Figure 15 A third example message flow and procedure for dynamic PDSCH power allocation according to some aspects of the present disclosure is shown.

[0028] Figure 16 A fourth example message flow and procedure for dynamic PDSCH power allocation according to some aspects of the present disclosure is shown.

[0029] Figure 17

[0014] An example procedure for a UE supporting dynamic PDSCH transmission power allocation according to some aspects of the present disclosure is shown.

[0030] Figure 18

[0014] Example procedures for a network entity supporting dynamic PDSCH transmission power allocation according to some aspects of the present disclosure are shown.

[0031] Figure 19 An example is shown for PDSCH power offset or power backoff indication when the scheduling offset is below a threshold.

[0032] Figure 20 An example is shown for PDSCH power offset or power backoff indication when the scheduling offset is above a threshold. DETAILED DESCRIPTION

[0033] For the purpose of describing the innovative aspects of the present disclosure, the following description relates to certain implementations. However, it will be readily appreciated by those skilled in the art that the teachings herein can be applied in a variety of different ways. Some of the examples in the present disclosure are based on wireless communications based on 3rd Generation Partnership Project (3GPP) wireless standards such as 4th generation (4G) long term evolution (LTE) and 5th generation (5G) new radio (NR) standards. However, the implementations described can be implemented in any device, system or network (such as a system utilizing 3G, 4G, 5G, WiFi or future radio technologies) capable of sending and receiving radio frequency signals according to any wireless communication standard (including any one of the Institute of Electrical and Electronics Engineers (IEEE) 802.11, 802.15 or 802.16 wireless standards), or other known signals for communicating within a wireless, cellular or Internet of Things (IoT) network.

[0034] Various aspects of the present disclosure relate to power allocation for a physical downlink shared channel (PDSCH) based on channel conditions in a wireless communication system. In some wireless communication systems, the transmission power of the PDSCH is determined by a network entity (such as a base station) based on channel state information (CSI) from a user equipment (UE). Typically, the power allocation for the PDSCH is based on the channel quality indicator (CQI) reported in the CSI. However, as shown in FIG. Figure 2 、 Figure 3A and Figure 3B As further described, these techniques may result in transmit power settings that are higher than required to support quality of service on the PDSCH.

[0035] The present disclosure provides systems, methods, and apparatus for implementing dynamic transmit power allocation for PDSCH based on additional information from the UE. In some aspects, a channel state information (CSI) report may be modified to include a power backoff indicator (PBI) report that includes one or more PBIs suggested by the UE. The UE may determine one or more PBIs based on a measured signal to interference plus noise ratio (SINR) and a target spectral efficiency for the reported CQI. In some aspects, the PBI is an offset between a measured SINR and a working SINR that meets a target block error rate (BLER) for the reported CQI. A network entity may receive one or more PBIs from the UE and use the one or more PBIs to set the transmit power of the PDSCH. In some aspects, the network entity may send control signaling indicating the transmit power, power offset, or additional power backoff for the PDSCH. In some implementations, the UE and the network entity may implement aspects of the present disclosure to reduce the transmit power for the PDSCH while still supporting the target quality of service for the PDSCH. The disclosed techniques can reduce power allocation, improve system performance by reducing interference from PDSCH, and reduce network consumption.

[0036] Figure 1 An example of a user equipment (UE) and a network entity according to some aspects of the present disclosure is shown, showing power allocation for a physical downlink shared channel (PDSCH). Figure 100 shows a UE 102 and a network entity 104 of a wireless communication system. The network entity 104 may be a base station. Depending on the wireless communication standard supported by the base station, different types of base stations may be referred to as NodeBs, LTE evolved NodeBs (eNBs), next generation NodeBs (gNBs), access points (APs), radio heads, transmit receive points (TRPs), etc. The network entity 104 transmits data to the UE via the PDSCH 118. The PDSCH 118 has a transmission power set by the network entity 104 based on channel conditions. Without the techniques of the present disclosure, the transmission power of the PDSCH 118 is determined based on the CQI obtained from the CSI report 112. For a multiple-input multiple-output (MIMO) system, the CSI report 112 may provide key information for the network entity to select a digital precoder for the UE.

[0037] refer to Figure 1Conventional CSI measurement and reporting techniques are described. Typically, the network entity 104 sends a CSI reporting configuration 106 via RRC signaling, such as CSI-ReportConfig, to configure CSI reporting. The CSI reporting configuration 106 may indicate a channel state information reference signal (CSI-RS), which is used as a channel measurement resource (CMR 108) for UE 102 to measure downlink channel conditions. Simultaneously, the network entity 104 may configure an interference measurement resource (IMR 110) for UE 102 to measure interference.

[0038] By measuring CMR 108 and IMR 110, UE 102 is able to identify CSI, which may include at least one of a rank indicator (RI), a precoder matrix indicator (PMI), a channel quality indicator (CQI), and a layer indicator (LI). RI and PMI are used to indicate the digital precoder. CQI is used to indicate the signal-to-interference-plus-noise ratio (SINR) status to help the network entity determine the modulation and coding scheme (MCS). LI is used to identify the strongest layer for the reported precoder indicated by RI and PMI. For CSI reference signal (CSI-RS) resources, the network entity can configure the power offset between PDSCH and CSI-RS through an RRC parameter such as powerControlOffset, and configure the power offset between CSI-RS and synchronization signal blocks (SSBs) through another RRC parameter such as powerControlOffsetSS.

[0039] UE 102 measures CMR 108 and IMR 110 to determine a CQI. UE 102 reports the CQI to network entity 104 in a CSI report 112. For each CQI, a target spectral efficiency (SE) is predefined. The UE may identify an operating signal-to-interference-plus-noise ratio (SINR) for each CQI, i.e., an SINR that produces a BLER that is the same as a target block error rate (BLER) threshold. When reporting a CQI, the UE may identify that the measured SINR is equal to the operating SINR for the CQI plus an offset. The CQI may be a number (such as from 0 to 15) that informs network entity 104 that the measured SINR meets the threshold for the operating SINR for a particular CQI. UE 102 is expected to report the highest CQI met by the measured SINR.

[0040] In conventional systems, the network entity 104 sets the transmit power (or power backoff) based on the CQI, without regard to how high or low the measured SINR is relative to the operating SINR for a particular CQI. Some UEs may have better channel conditions or require even less power to achieve the desired QoS for the PDSCH 118 than would normally be selected for a particular CQI. Current CSI measurement and reporting only supports CQI reporting and does not enable the UE 102 to report any indication of the offset between the measured SINR and the operating SINR to assist the network entity in determining the transmit power backoff for the PDSCH 118. If the network entity 104 could be made aware of the offset between the measured SINR and the operating SINR or meet the recommended power backoff for the CQI, it is possible that the network entity 104 could transmit the downlink signal using lower power to reduce interference from the PDSCH.

[0041] In some aspects of the present disclosure, network entity 104 may include a PBI report configuration 114 in CSI report configuration 106. For example, UE 102 may notify network entity 104 that UE 102 is capable of reporting one or more PBIs in PBI report 116. PBI report 116 may be included in CSI report 112 to inform network entity 104 of the power backoff required to meet the reported CQI. This disclosure includes several example implementations of CSI report configuration 106 and PBI report configuration 114. For example, network entity 104 may configure constraints to limit the candidate CQIs considered by UE 102. In another example, CSI report configuration 106 may configure multiple CSI-RS resources with different transmit power offsets and request UE 102 to measure and report aggregate or detailed PBI information for the CSI-RS resources. In some implementations, network entity 104 may configure subband CQI and request subband PBI via CSI report configuration 106. In addition, the PBI report 116 may include one or more PBIs (or subband PBIs) per CSI-RS resource, per codeword, or both. Alternatively or additionally, the PBI report 116 may include a PBI (or subband PBI) that is an aggregated PBI across all CSI-RS resources, all codewords, or both.

[0042] The network entity 104 may set the transmit power of the PDSCH 118 based on the PBI report 116. Without the techniques of the present disclosure, the network entity 104 cannot dynamically change the transmit power for the PDSCH based on the received CSI because the power offset between the PDSCH and the CSI-RS, the power offset between the CSI-RS and the SSB, and the transmit power for the SSB are configured by the network entity 104 through RRC signaling. In some aspects of the present disclosure, the network entity 104 may send control signaling to inform the UE 102 of the transmit power (or power backoff) of the PDSCH 118. For example, in some implementations, the network entity 104 may send a medium access control (MAC) control element (CE) or downlink control information (DCI) indicating the transmit power or additional power backoff for the PDSCH 118. For example, the MAC CE or DCI may indicate a transmit power offset between at least one CSI-RS resource and the PDSCH, a transmit power offset between at least one CSI-RS resource and a synchronization signal block (SSB), a transmit power of at least one SSB, an additional power backoff for the PDSCH 118, an additional power backoff for at least one CSI-RS resource, an additional power backoff for at least one SSB, or any combination thereof. Using the information in the MAC CE or DCI, the UE 102 may adjust its receiver (such as automatic gain control (AGC)) using the PDSCH transmit power (or power backoff) set by the network entity 104 to correctly receive the PDSCH 118.

[0043] Thus, the present disclosure includes various methods and techniques for dynamic transmission power allocation for PDSCH. These include PBI reporting configuration 114 and PBI reporting 116 for requesting and obtaining a PDSCH transmission power backoff indicator from a UE 102. In addition, the methods and techniques of the present disclosure enable control signaling for dynamic transmission power allocation for PDSCH. The described solution can have the advantageous result of reduced power allocation for PDSCH, allowing the network entity 104 to improve system performance, reduce interference from PDSCH, and reduce network power consumption.

[0044] Figure 2 Example SINR measurements and reported CQIs are shown. Graph 200 shows an example for SINR measurements and CQI reporting. In graph 200, the vertical axis is the operating SINR (in decibels (dB)) and the horizontal axis is the CQI value. Plotted points, such as point 218 where CQI = 5 and operating SINR = 0 dB, indicate the CQI value corresponding to a particular operating SINR. For ease of reference, curve 220 is shown. Figure 2In the example shown in FIG, the measured SINR 204 (such as 12 dB) is higher than the operating SINR 202 (such as 10 dB) with the corresponding CQI = 15 plus an offset 208 (such as 2 dB). In this example, the UE will report CQI = 10 (shown at CQI 206). When transmitting the PDSCH based on the SE indicated by the CQI, the network entity may apply a certain power backoff, such as a power backoff that is less than or equal to the offset 208. This power backoff can reduce interference to other UEs and reduce power consumption for the network entity.

[0045] In some cases, the measured SINR may be so large that the UE reports a maximum CQI, such as CQI = 15. For example, a cell center UE may measure a very large SINR. As shown in graph 200, the operating SINR 212 for CQI = 15 (shown at CQI 210) may be 20 dB. However, the same CQI 210 will be reported regardless of whether the measured SINR is the first measured SINR 214 or the second measured SINR 216, because both the first measured SINR 214 and the second measured SINR 216 are higher than the operating SINR 212 for the highest CQI value of 15. Without the techniques of the present disclosure, the network entity would limit its power backoff to a predefined offset for CQI = 15. Using the techniques of the present disclosure, the UE can report a power backoff that can be used based on the measured SINR while still meeting the reported CQI.

[0046] Figure 3A An example of a CQI distribution diagram 300a from a system-level simulation is shown. In the CQI distribution diagram 300a, the vertical axis is the number of reports (such as CSI reports), and the horizontal axis is the CQI value. Each bar in the CQI distribution diagram 300a indicates the number of reports that include a specific CQI value. As shown in the CQI distribution 300a, many CQI reports indicate CQI=15. It is desirable to reduce the transmission power for the PDSCH to reduce interference. However, current techniques for power backoff are limited because the offset is predefined for each CQI. The techniques of the present disclosure enable a UE to send a PBI report that indicates a power backoff that can be used by a network entity, particularly when reporting a maximum CQI (CQI=15) or when a greater granularity than is currently possible with an offset defined for each CQI is required.

[0047] Figure 3BAn example is shown for a geometric SINR distribution graph 300b from a system level simulation. In the geometric SINR distribution graph 300b, the vertical axis is the cumulative distribution function (CDF), and the horizontal axis is SINR (in dB). Curve 302 indicates the CDF at various amounts of SINR.

[0048] For high SINR users, the difference between the measured SINR and the operating SINR may be large. It is possible that the network entity may transmit the downlink signal with power backoff (such as a larger power backoff than is normally associated with each CQI) while still resulting in a measured SINR that meets the operating SINR for a particular CQI. Using a larger power offset will have the desired result of reducing interference from the PDSCH and reducing network power consumption.

[0049] Figure 4 An example message flow and procedure 400 is shown in which a CSI report includes a PBI report. A UE 102 may report UE capabilities 402 indicating at least whether it supports CSI reporting with PDSCH transmit power fallback reporting. Based on the received UE capabilities, the network entity 104 transmits first control signaling 404 that configures at least one CSI reporting configuration for CSI reporting with PBI reporting and at least one CSI-RS resource for CSI measurement. The network entity 104 may transmit the first control signaling 404 via RRC signaling, such as RRCReconfiguration or CSI-ReportConfig. In some implementations, for semi-persistent CSI-RS and / or CSI reporting or aperiodic CSI-RS and / or CSI reporting, the network entity 104 may transmit second control signaling 406 that triggers the configured at least one CSI-RS resource and / or at least one CSI reporting configuration 406. For example, the second control signaling 406 may be a MAC CE or DCI that triggers CSI-RS and / or CSI reporting. The network entity 104 may then transmit the configured at least one CSI-RS resource 408 for CSI measurement and reporting. The UE 102 may determine a PBI report 410 (sometimes also referred to as a transmit power backoff report) based on the measured CQI for one or more codewords and the measured SINR from the at least one CSI-RS resource. The UE may then transmit a CSI report 412 with the PBI report via the PUSCH or PUCCH. The network entity 104 receives the CSI report and determines the transmit power for the PDSCH 414 based on the PBI report.

[0050] Figure 5 An example message flow and procedure 500 is shown in which a CSI report includes a PBI report based on a CQI subset restriction. Figure 4Compared to the procedure in 400, the difference is in Figure 5 In the embodiment of the present invention, the network entity 104 additionally configures the CQI subset restriction in the first control signaling 504. The UE 102 then selects a CQI from the configured CQI subset, determines a PBI 510 based on the selected CQI for at least one codeword and the measured SINR from at least one CSI-RS resource, and reports the PBI 510 in the CSI report 412.

[0051] Figure 6 An example message flow and procedure 600 is shown in which a CSI report includes a PBI report based on a target spectral efficiency. Figure 4 Compared to the procedure in 400, the difference is in Figure 6 In the first control signaling 604, the network entity 104 additionally configures at least a target spectral efficiency (SE) in the first control signaling 604. The UE then determines a PBI 610 based on the configured target SE and the measured SINR from at least one CSI-RS resource and reports the PBI 610 in the CSI report 412.

[0052] Figure 7 An example process 700 for a UE supporting PBI reporting according to some aspects of the present disclosure is shown. In block 702, the UE may send UE capabilities regarding PDSCH transmit power backoff reporting. In block 704, the UE receives first control signaling that configures at least one CSI reporting configuration including a PDSCH transmit power backoff report (such as a PBI report) and at least one CSI report configuration of at least one CSI-RS resource for CSI measurement and reporting, and optionally configures a CQI subset limit or target spectral efficiency. In block 706, the UE may receive second control signaling that triggers the configured at least one CSI-RS resource and / or at least one CSI reporting configuration. In block 708, the UE receives the configured at least one CSI-RS resource. In block 710, the UE determines CSI including at least a PDSCH transmit power backoff measurement based on the measured CQI, the configured CQI subset limit or target spectral efficiency, and the received at least one CSI-RS resource. In block 712, the UE sends a CSI report including at least the PDSCH transmit power backoff report.

[0053] Figure 8An example process 800 for a network entity to support PBI reporting according to some aspects of the present disclosure is shown. At block 802, the network entity may receive UE capabilities regarding PDSCH transmit power backoff reporting. At block 804, the network entity sends first control signaling that configures at least one CSI report configuration including at least a PDSCH transmit power backoff report (such as a PBI report) and at least one CSI report configuration for at least one CSI-RS resource for CSI measurement and reporting, and optionally configures a CQI subset limit or a target spectral efficiency. At block 806, the network entity may send second control signaling that triggers the configured at least one CSI-RS resource and / or at least one CSI report configuration. At block 808, the network entity sends the configured at least one CSI-RS resource. At block 812, the network entity receives a CSI report 812 including at least the PDSCH transmit power backoff report.

[0054] In the present disclosure, unless otherwise stated, RRC signaling refers to an RRC reconfiguration message from a network entity to a UE, or a system information block (SIB), where the SIB may be an existing SIB (such as SIB1) or a new SIB (such as SIB J, where J is an integer higher than 21) sent by the gNB.

[0055] In the present disclosure, unless otherwise stated, the network entity may receive UE capabilities from the UE or from a core network (such as an Access and Mobility Management Function (AMF)) or another network entity.

[0056] In some implementations, the UE may send UE capabilities for CSI reporting with PBI reporting, indicating at least one of the following elements: whether the UE supports PBI reporting; the maximum number of configured CSI-RS resources for PBI reporting; and the maximum number of CSI-RS resources in a slot for PBI reporting. The above UE capabilities may be counted per component carrier (CC), across all CCs in a frequency band or frequency band combination, or across all CCs in the UE.

[0057] PBI measurement and reporting and related control signaling

[0058] Option 1-1: PBI reporting based on reported CQI

[0059] In some implementations, the UE determines a PBI based on a measured SINR and at least one reported CQI. The UE determines an operating SINR for the reported CQI. The network entity configures a CSI report including a PBI report through first control signaling. In one example, the network entity configures the PBI report by configuring reportQuantity to cri-RI-PMI-CQI-PBI, cri-RI-i1-CQI-PBI, cri-RI-CQI-PBI, or cri-RI-LI-PMI-CQI-PBI, which indicates that the UE should report PBI in addition to other CSI components such as CRI, RI, PMI, or a portion of PMI (such as the first PMI, i1), CQI, and / or LI. In another example, the network entity configures the PBI report by configuring a separate RRC parameter such as enablePbiReport.

[0060] In some implementations, the UE may identify an offset between the measured SINR and the operating SINR for the reported CQI.

[0061] In one example, the offset is calculated as shown in formula (1):

[0062] in indicates the measured SINR in dB, and for multi-layer transmission, it indicates the average SINR across layers; Indicates the operating SINR for the reported CQI in dB, and for multi-layer transmission, it indicates the average SINR across layers.

[0063] In another example, the offset is calculated as shown in formula (2):

[0064] The UE then reports the PBI to quantize the offset. In some implementations, the step size used for every two PBIs is predefined. In one example, the UE reports the PBI using 3 bits, and the indication of the 3-bit PBI can be as shown in Table 1. In some other implementations, the network entity configures the step size used for every two PBIs via RRC signaling or MAC CE. In some other implementations, the UE reports the step size used for every two PBIs via CSI reporting or separate reporting. Table 1: Examples for PBI indications

[0065] In some other implementations, the UE may identify the offset between the measured SINR, the operating SINR for the reported CQI, and the latest reported offset.

[0066] In one example, the offset is calculated as shown in formula (3):

[0067] in Indicates the measured SINR in dB; indicates the operating SINR for the reported CQI in dB; offset' indicates the latest reported offset for the same CSI reporting configuration, and if the latest reported CQI is different from the currently determined CQI, offset'=0 dB.

[0068] In another example, the offset is calculated as shown in formula (4):

[0069] The UE then reports the PBI to quantize the offset. In some implementations, the step size used for every two PBIs is predefined. In one example, the UE reports the PBI using 3 bits, and the indication of the 3-bit PBI can be as shown in Table 2. In some other implementations, the network entity configures the step size used for every two PBIs via RRC signaling or MAC CE. In some other implementations, the UE reports the step size used for every two PBIs via CSI reporting or separate reporting. Table 2: Examples for PBI indications

[0070] Option 1-1a: Single PBI report per CSI report

[0071] In some implementations, for CSI reporting, the UE sends a single PBI and other CSI via PUCCH or PUSCH.

[0072] In some implementations, the network entity configures the UE to report one CQI per subband, the UE calculates an offset for each subband based on the subband CQI and the measured SINR for each subband, and reports a PBI calculated based on the minimum, maximum, or average offset across all subbands. In some other implementations, the network entity configures the UE to report one CQI per subband, the UE calculates an offset based on the wideband CQI and the wideband measured SINR, and reports a wideband PBI based on the wideband offset.

[0073] In some implementations, the UE reports CQI for more than one codeword. The UE may report PBI based on an offset from a codeword. In some implementations, the UE reports PBI based on CQI from the first or last codeword. In some other implementations, the UE reports an indicator indicating the codeword index to determine the PBI. In some other implementations, the UE reports PBI based on CQI from the codeword with the minimum or maximum spectral efficiency or CQI.

[0074] In some other implementations, the UE reports CQI for more than one codeword. The UE may report PBI based on offsets from all codewords. The UE may report PBI corresponding to the maximum, minimum, or average offset across all codewords.

[0075] Figure 9 An example PBI report in a short physical uplink control channel (PUCCH) is shown. For a short PUCCH, such as a PUCCH with less than or equal to 4 symbols, the UE sends PBI 904 and other CSI (such as CRI (if reported), RI (if reported), CQI, PMI) in a single part 902.

[0076] Figure 10A An example PBI report is shown in CSI Part 1 in a long PUCCH or a physical uplink shared channel (PUSCH). For long PUCCH (such as PUCCH with more than 4 symbols) and PUSCH, the UE sends PBI 1004 in CSI Part 1 or CSI Part 2. Figure 10A An example for CSI reporting with PBI in long PUCCH or PUSCH is shown, where the PBI 1004 is in CSI part 1 1002.

[0077] Figure 10B An example PBI report in long PUCCH or PUSCH is shown. Figure 10B In the example shown in , PBI 1008 is included in CSI part 2 1006 .

[0078] Option 1-1b: PBI reporting per codeword

[0079] Figure 10C An example PBI report in CSI part 1 and CSI part 2 in a long PUCCH or PUSCH is shown. A first part 1010 of the PBI is included in CSI part 1 1014 , and a second part 1012 of the PBI is included in CSI part 2 1016 .

[0080] In some implementations, for CSI reporting, the UE sends a single PBI per codeword along with other CSI via PUCCH or PUSCH. Option 1-1a Compared to Option 1-1b In

[0014] , the UE reports more than one PBI in the CSI report, where each PBI corresponds to a codeword. The UE determines the PBI based on the measured SINR and the operating SINR for the reported CQI for the corresponding codeword.

[0081] In some implementations, when reporting PBI via PUSCH or long PUCCH, the UE reports the entire PBI in CSI part 1 or CSI part 2, e.g. Figure 9 、 Figure 10A 、 Figure 10B . In some other implementations, when PBI is reported through PUSCH or long PUCCH, the UE may report some of the PBI in CSI part 1 and other PBI in CSI part 2. The PBI in CSI part 1 corresponds to the CQI in CSI part 1, and the PBI in CSI part 2 corresponds to the CQI in CSI part 2. The network entity and the UE determine the presence of the PBI in CSI part 2 based on the presence of the CQI in CSI part 2. In one example, if the UE needs to report the CQI for the second codeword in CSI part 2, the UE reports the PBI for the second codeword.

[0082] Option 1-1c: Per-subband PBI reporting

[0083] In some implementations, for CSI reporting, the UE sends a single PBI per subband and other CSI via PUCCH or PUSCH. Option 1-1a Compared to Option 1-1c In the CSI report, the UE reports more than one subband PBI. The UE determines the subband PBI based on the measured SINR for the subband and the operating SINR for the reported CQI for the corresponding subband.

[0084] In some implementations, the network entity configures the subband for PBI reporting through first control signaling or second control signaling. In some implementations, the network entity configures the same subband for subband PBI reporting and subband PMI / CQI. The network entity may configure the subband for PBI reporting and subband PMI / CQI through a common RRC parameter such as CSI-ReportingBand. In some other implementations, the network entity configures a different subband for subband PBI reporting than for subband PMI / CQI. In one example, the network entity configures the subband for PBI reporting through a separate RRC parameter such as pbi-ReportingBand. In another example, the network entity configures the subbands for PBI reporting based on the subband configuration for PMI / CQI through an RRC parameter indicating the number of subbands per PBI, such as nrofSubbandsPerPbi; or the number of PBIs per subband or per CQI, such as nrofPbiPerSubband or nrofPbiPerCqi.

[0085] Option 1-1d: PBI reporting per codeword per subband

[0086] In some implementations, for CSI reporting, the UE sends a single PBI per codeword per subband and other CSI via PUCCH or PUSCH. Option 1-1a / 1-1b / 1-1c Compared to Options 1-1d In the CSI report, the UE may report more than one subband PBI for each codeword. The UE determines the subband PBI for a codeword based on the measured SINR for the subband and the operating SINR for the reported CQI for the corresponding subband and codeword.

[0087] Option 1-1e: Configurable PBI reporting granularity

[0088] In some implementations, the network entity configures the granularity of the PBI report in the CSI report through the first control signaling or the second control signaling. Option 1-1a / 1-1b / 1-1c / 1-1d Compared to Options 1-1e In

[0015] , the network entity configures whether the UE should report per-subband or wideband PBI, and / or report per-codeword or across-codeword PBI. In some implementations, the UE may further report the supported granularity for PBI reporting, such as whether it supports wideband PBI reporting or subband PBI reporting, and / or whether it supports per-codeword or across-codeword PBI reporting.

[0089] Option 1-2: PBI reporting only when the reported CQI is the maximum CQI

[0090] In some implementations, the UE reports the PBI only when its reported CQI is the maximum CQI. Option 1-1 Compared to Options 1-2 In the example, if the corresponding CQI for PBI reporting is not the maximum CQI, such as CQI=15, the UE does not report PBI or reports a default value of PBI, such as '000'.

[0091] In some implementations, based on the traffic type and some previous reports, such as Layer 3 Reference Signal Received Power (L3-RSRP) or Layer 3 SINR (L3-SINR), the network entity may identify candidate values ​​for potential spectral efficiency. The network entity may configure the maximum CQI for CSI reporting via RRC signaling or MAC CE. The network entity may configure the maximum CQI per RI, per codeword, or across codewords.

[0092] In some other implementations, the network entity configures the CQI subset restriction for CSI reporting through RRC signaling or MAC CE. The network entity can configure the CQI subset restriction per RI, per codeword, or across codewords. In one example, the network entity configures the CQI subset restriction based on a bitmap such as a 16-bit bitmap. Wherein, a value of "1" for bit x indicates that CQI=x is valid for CSI reporting, and a value of "0" for bit x indicates that CQI=x is invalid for CSI reporting. For CQI reporting, the UE should report a CQI based on a valid CQI based on the configured CQI subset restriction. The bit width for the absolute CQI is determined based on the number of valid CQIs. In one example, the bit width is calculated as , where K indicates the number of valid CQIs.

[0093] Options 1-3: PBI reporting based on target SE

[0094] In some implementations, the UE reports a PBI based on the measured SINR and target SE and the reported RI (such as the number of layers). Option 1-1 Compared to Options 1-3 In

[15] , the UE determines the PBI based on the offset between the measured SINR and the operating SINR for the target SE over the reported number of layers.

[0095] In some implementations, the network entity configures a wideband target SE for CSI reporting configuration. The UE may identify the target SE for each layer based on the target SE and the number of layers indicated by the reported RI. The UE may then identify the operating SINR for the target SE for each layer and calculate the offset between the measured SINR and the operating SINR.

[0096] In some other implementations, the network entity configures a target SE per subband. The UE may identify a target SE per layer for each subband based on the target SE per subband and the number of layers indicated by the reported RI. The UE may then identify an operating SINR per subband based on the target SE per layer per subband and calculate an offset between the measured SINR and the operating SINR for each subband.

[0097] In some implementations, if the SINR measured by the UE identifier is lower than the operating SINR for the configured target SE, the UE reports a default state of the PBI, such as '000'. In some other implementations, if the SINR measured by the UE identifier is lower than the operating SINR for the configured target SE, the UE does not report the PBI. In some other implementations, if the SINR measured by the UE identifier is lower than the operating SINR for the configured target SE, the UE reports a PBI that recommends that the network entity increase the transmission power to meet the target SE.

[0098] Options 1-4: PBI reporting based on multiple CSI assumptions

[0099] In some implementations, the network entity configures multiple power offsets between the PDSCH and the CSI-RS for CSI reporting. The UE may report CSI for one of the recommended power offsets. Alternatively, the UE may report CSI for each power offset, and the network entity may select the corresponding power offset and MCS for PDSCH transmission based on the received CSI.

[0100] Option 1-4a: Implicit PBI reporting based on power offset reporting from a list of candidate power offsets

[0101] Figure 11 An example process 1100 is shown for generating a PBI report based on multiple candidate power offsets. In some implementations, a network entity configures a list of power offsets for CSI-RS resources for CSI reporting via RRC signaling or MAC CE (block 1102). Figure 11In the example shown in FIG, the UE determines a full-rank PMI selection based on a channel estimated from a CSI-RS (block 1104). The UE may generate CSI measurement hypotheses for various power offsets. For example, at block 1106, the UE generates a first CSI measurement hypothesis (CSI measurement hypothesis 1) based on a first power offset (-3 dB) taking into account a first RI / CQI measurement. Similarly, at blocks 1108, 1110, and 1112, the UE generates alternative CSI measurement hypotheses based on different power offsets (such as 0 dB, 3 dB, and 6 dB, respectively). At block 1114, the UE identifies an optimal power offset based on the corresponding RI / CQI measurements for each of the power offsets in the CSI measurement hypotheses in blocks 1106, 1108, 1110, and 1112.

[0102] In some implementations, the UE may report the PBI by reporting one of the candidate power offsets. The UE may report other CSI based on the reported PBI, such as RI / PMI / CQI. The UE may select the lowest power offset that produces the highest SE based on the reported CQI and RI, or the lowest SE that exceeds the target SE configured by RRC signaling or MAC CE from the network entity.

[0103] In some other implementations, the UE may report a CQI for each power offset, and the network entity may determine the optimal power backoff based on the reported CSI. In some implementations, the UE reports a common RI / PMI for all power offsets and a separate CQI for each power offset. In some other implementations, the UE reports a RI / PMI / CQI for each power offset. In some other implementations, the UE reports a common PMI for full rank and a separate RI / CQI for each power offset. Then, for each RI, the CQI is calculated based on the first N layers from the reported full rank PMI, where N is the number of layers indicated by the reported RI.

[0104] In some implementations, a CSI report occupies 1 CSI processing unit. In some other implementations, the UE processes CSI measurements for each hypothesis in parallel, and the CSI report may occupy M CSI processing units, where M is the number of candidate power offsets. In some other implementations, the UE processes CSI measurements for some hypotheses in parallel, and the CSI report occupies K CSI processing units, such as 1<=K<=M, where the UE reports the value of K via UE capabilities. In some implementations, the UE reports UE capabilities that indicate an additional processing delay for the CSI report over the minimum processing delay for traditional CSI reporting (such as CSI reporting based on a CSI-RS with a single power offset). Alternatively, the additional processing delay may be predefined or determined based on the number of candidate power offsets, such as 4M symbols.

[0105] Option 1-4b: Implicit PBI based on CRI reporting from a list of CSI-RS resources with different power offsets Report

[0106] Figure 12 An example PBI report based on multiple CSI-RS resources with different power offsets is shown. A network entity configures a list of CSI-RS resources with different power offsets in one or more CSI reports (shown at blocks 1202, 1204, 1206, and 1208), wherein the network entity configures CSI-RS resources from the same antenna port or sharing the same spatial transmission filter or the same quasi-co-located (QCL) property and / or having the same bandwidth and / or frequency domain density. At block 1210, the UE determines a full-rank PMI based on a channel estimated from a subset or all of the CSI-RS resources. At blocks 1212, 1214, 1216, and 1218, the UE generates corresponding CSI measurement hypotheses for the subset or all of the CSI-RS resources. The CSI measurement hypotheses include RI / CQI measurements based on the corresponding CSI-RS resources and the full-rank PMI. At block 1220, the UE identifies an optimal power offset from the CSI measurement hypothesis and reports the CRI for the CSI-RS that provides the optimal power offset. The UE also reports the RI / PMI / CQI for the CSI-RS indicated by the CRI.In some implementations, the UE may report CSI for multiple CSI measurement hypotheses.

[0107] In some implementations, the UE may report PBI by reporting the CSI-RS Resource Indicator (CRI). The UE may report other CSI based on the reported CRI, such as RI / PMI / CQI. The UE may select the CRI with the lowest power offset that produces the highest SE based on the reported CQI and RI, or the lowest SE that exceeds the target SE configured by RRC signaling or MAC CE from the network entity.

[0108] In some implementations, the UE may report a CQI for each CSI-RS, and the network entity may determine the optimal power backoff based on the reported CSI. In some implementations, the UE may report a common RI / PMI for all CSI-RS resources, and a separate CQI for each CSI-RS resource. In some other implementations, the UE may report RI / PMI / CQI for each CSI-RS resource. In some other implementations, the UE may report a common PMI for full rank, and a separate RI / CQI for each CSI-RS resource. The CQI is then calculated for the CSI-RS resource based on the first N layers from the reported full rank PMI, where N is the number of layers indicated by the reported RI.

[0109] In some implementations, the CSI report occupies 1 CSI processing unit. In some other implementations, the UE processes the CSI measurements for each hypothesis in parallel, and the CSI report occupies M CSI processing units, where M is the number of candidate power offsets. In some other implementations, the UE processes the CSI measurements for some hypotheses in parallel, and the CSI report occupies K CSI processing units, such as 1<=K<=M, where the UE reports the value of K via UE capabilities. In some implementations, the UE reports UE capabilities that indicate an additional processing delay for the CSI report over the minimum processing delay for conventional CSI reporting (such as CSI reporting based on a CSI-RS with a single power offset). Alternatively, the additional processing delay may be predefined or determined based on the number of CSI-RS resources with different power offsets, such as 4M symbols.

[0110] Figure 13 A first example message flow and procedure 1300 for dynamic PDSCH power allocation according to some aspects of the present disclosure is shown. The UE 102 may provide a dynamic PDSCH power allocation based on a CSI reporting framework (such as using a CSI reporting framework for each of the CSIs). Figure 4 、 Figure 5 and Figure 6, or 600 as described herein. The PBI is reported by the network entity 104 using the procedures 400, 500, or 600 described herein. Based on the received PBI report or some other measurement report or open-loop link adaptation, the network entity 104 sends third control signaling 1304 that configures a power offset between the PDSCH and at least one CSI-RS resource and / or a power offset between at least one CSI-RS resource and an SSB. In some implementations, the CSI-RS may be quasi-co-located (QCLed) with the PDSCH, such as when the CSI-RS is configured as a quasi-co-located source reference signal in a transmission configuration indicator (TCI) state indicated for the PDSCH. The network entity 104 may send the third control signaling via a MAC CE or a DCI. In some implementations, the network entity 104 may send fourth control signaling 1308, such as a DCI, that triggers the PDSCH. The network entity 104 sends the PDSCH 1308 based on the updated power. At block 1310, the UE 102 determines an AGC factor based on the configured transmit power for the PDSCH as indicated in the third control signaling 1304. The configured transmit power may be indicated as a power offset between the PDSCH and the CSI-RS and / or a power offset between the CSI-RS and the SSB, among other examples. The UE 102 receives the PDSCH using the determined AGC factor. The UE 102 then sends an ACK / NACK report 1312 for the PDSCH to the network entity 104. At block 1314, the network entity 104 receives the ACK / NACK report for the PDSCH from the UE 102.

[0111] Figure 14 A second example message flow and procedure 1400 for dynamic PDSCH power allocation according to some aspects of the present disclosure is shown. Figure 13 Compared to the program in Figure 14 In the embodiment, the network entity 104 indicates the power offset between the PDSCH and the CSI-RS through the fourth control signaling 1406 .

[0112] Figure 15 A third example message flow and procedure 1500 for dynamic PDSCH power allocation according to some aspects of the present disclosure is shown. Figure 13 Compared to the program in Figure 15 In FIG, the network entity 104 instructs the UE 102 to report the PBI based on the received PDSCH. Figure 13As described above, the network entity 104 uses one or more power offsets to indicate the transmit power in the third control signaling (block 1304). At block 1510, the UE 102 determines an AGC factor based on the configured transmit power for the PDSCH and receives the PDSCH using the determined AGC factor. The UE measures the PBI based on the determined AGC factor and the operating SINR for the PDSCH. In addition to the ACK / NACK report for the PDSCH, the UE 102 also reports the PBI 1512 to the network entity. At block 1514, the network entity 104 receives the ACK / NACK and PBI for the PDSCH.

[0113] Figure 16 A fourth example message flow and procedure 1600 for dynamic PDSCH power allocation is shown in accordance with some aspects of the present disclosure. Figure 14 and Figure 15 Compared to the program in Figure 16 In the embodiment, the network entity 104 indicates the power offset between the PDSCH and the CSI-RS through the fourth control signaling 1606 .

[0114] Figure 17 An example process 1700 for a UE supporting dynamic PDSCH transmission power allocation according to some aspects of the present disclosure is shown. At block 1704, the UE receives first control signaling that updates a power offset between a PDSCH and at least one CSI-RS resource and / or a power offset between at least one CSI-RS resource and an SSB. At block 1706, the UE receives second control signaling that triggers a PDSCH and optionally indicates a power offset between the PDSCH and at least one CSI-RS resource and / or a PBI report. At block 1708, the UE receives a PDSCH based on the updated power offset between the PDSCH and the CSI-RS and / or the updated power offset between the CSI-RS and the SSB. At block 1710, the UE sends an ACK / NACK for the PDSCH and optionally sends a PBI for the PDSCH. In some implementations, the UE may use the same PUCCH or PUSCH resource to send the ACK / NACK and PBI. Alternatively, the UE may send ACK / NACK and PBI on different PUCCH or PUSCH resources.

[0115] Figure 18An example process 1800 for a network entity to support dynamic PDSCH transmission power allocation according to some aspects of the present disclosure is shown. At block 1804, the network entity sends first control signaling that updates a power offset between a PDSCH and at least one CSI-RS resource and / or a power offset between at least one CSI-RS resource and an SSB. At block 1806, the network entity sends second control signaling that triggers a PDSCH and optionally indicates a power offset between the PDSCH and at least one CSI-RS resource and / or a PBI report. At block 1808, the network entity sends a PDSCH based on the updated power offset between the PDSCH and the CSI-RS and / or the updated power offset between the CSI-RS and the SSB. At block 1810, the network entity receives an ACK / NACK for the PDSCH and optionally receives a PBI for the PDSCH.

[0116] Power offset update

[0117] Option 2-1: Power offset update via scheduling DCI

[0118] In some implementations, the network entity configures the power offset between the PDSCH and the CSI-RS via the scheduling DCI for the PDSCH.

[0119] In some implementations, the network entity configures an updated power offset between the PDSCH and the CSI-RS configured in the indicated TCI state for the PDSCH via DCI such as DCI format 1_0, DCI format 1_1, or DCI format 1_2. In some implementations, the indicated updated power offset is applied only to the scheduled PDSCH. In some other implementations, the indicated updated power offset is applied to the scheduled PDSCH and other PDSCHs following the scheduled PDSCH.

[0120] In some other implementations, the network entity indicates the power backoff for the PDSCH via a DCI such as DCI format 1_0, DCI format 1_1, or DCI format 1_2. The power offset between the PDSCH and the CSI-RS may be determined based on the configured power backoff for the PDSCH and the configured power offset between the PDSCH and the CSI-RS. In some implementations, the indicated updated power backoff applies only to the scheduled PDSCH. In some other implementations, the indicated updated power backoff applies to the scheduled PDSCH and other PDSCHs following the scheduled PDSCH.

[0121] In some implementations, the UE reports the UE capability of indicating a threshold (i.e., a minimum delay) to apply the indicated updated power offset or power backoff. If the scheduling offset is less than the minimum delay, the UE applies a default power offset or power backoff; otherwise, the UE applies the indicated updated power offset or power backoff. In some implementations, the default power offset or power backoff is predefined, such as 0 dB. In some other implementations, the default power offset or power backoff is configured by the network entity through RRC signaling or MAC CE. In some other implementations, the default power offset or power backoff is the power offset or power backoff applied to the most recent PDSCH. In some other implementations, the threshold may be predefined.

[0122] Figure 19 An example 1900 is shown for a power offset or power backoff indication when a scheduling offset is below a threshold. Figure 20 An example 2000 is shown for a power offset or power backoff indication when a scheduling offset is above a threshold.

[0123] Option 2-2: Power offset update via MAC CE

[0124] In some implementations, the network entity configures the power offset between PDSCH and CSI-RS, and / or the power offset between CSI-RS and SSB, and / or the transmission power of one or a subset of SSBs or all SSBs in the serving cell through MAC CE.

[0125] In some implementations, the network entity configures the updated absolute power offset and / or transmit power via a MAC CE. In some implementations, the UE applies the updated power offset and / or transmit power X milliseconds (ms) or time slots after the last symbol of the ACK for the PDSCH sent by the UE using a MAC CE, where X may be predefined, such as X=3; or reported by the UE via a UE capability report; or configured via RRC signaling or MAC CE from the network entity.

[0126] In some other implementations, the network entity configures the offset for the power offset and / or transmit power via a MAC CE. The UE then determines the power offset and / or transmit power based on the configured power offset and / or transmit power via RRC signaling and the offset indicated in the MAC CE. In some implementations, the UE applies the updated power offset and / or transmit power X ms or time slots after the last symbol of the ACK for the PDSCH sent using a MAC CE, where X is predefined, such as X=3; or reported by the UE via a UE capability report; or configured via RRC signaling or a MAC CE from the network entity.

[0127] In some implementations, the network entity additionally configures at least one of the following elements in the MAC CE: a physical cell identifier (PCI), an SSB index, a serving cell index, a CSI-RS resource set index, and a CSI-RS resource index. In some other implementations, the UE determines the PCI to apply the MAC CE based on the associated PCI for the PDSCH using the MAC CE, such as the PCI of the QCL source reference signal for the PDSCH.

[0128] Option 2-3: Power offset update via DCI

[0129] In some implementations, the network entity configures the power offset between the PDSCH and the CSI-RS, and / or the power offset between the CSI-RS and the SSB, and / or the transmit power of one, a subset of, or all of the SSBs in the serving cell via DCI. Compared to Option 2, the difference is that in Option 3, the network entity sends the indication via UE-specific DCI (such as DCI associated with a cell radio network temporary identifier (C-RNTI)) or multicast DCI (such as DCI associated with a configured RNTI such as a power offset RNTI (PO-RNTI)), where the RNTI is configured via RRC signaling from the network entity.

[0130] In some implementations, the UE applies the updated power offset and / or transmit power after X ms or time slots after the last symbol of the DCI it receives, where X is predefined, such as X=3; or reported by the UE via UE capability reporting; or configured by RRC signaling, MAC CE, or DCI from a network entity.

[0131] PDSCH-based PBI reporting

[0132] In some implementations, the network entity configures the UE to report PBI based on PDSCH. In some implementations, the network entity configures the UE to report PBI based on PDSCH through RRC signaling or MAC CE. In some other implementations, the network entity instructs the UE to report PBI based on PDSCH through scheduling DCI. In one example, in a scheduling DCI such as DCI format 1_1 or 1_2, the network entity configures a PBI report request to indicate whether the UE should report PBI for PDSCH. The PBI report request can occupy 1 bit, where the first state indicates that the UE should not report PBI, and the second state indicates that the UE should report PBI.

[0133] The UE measures the PBI based on the offset between the measured SINR and the operating SINR based on the indicated MCS for the PDSCH. Option 1-1a arrive Options 1-1e In the implementation mode, the UE can report a single wideband PBI across codewords, or a single PBI per codeword, or a subband PBI per codeword or across codewords.

[0134] Option 3-1: PBI reporting associated with ACK / NACK

[0135] In some implementations, the UE reports PBI and ACK / NACK through PUCCH or PUSCH resources configured by the network entity. The UE may multiplex bits for ACK / NACK and PBI, and then send the multiplexed bits through the configured PUCCH resources. In some implementations, the UE first multiplexes the ACK / NACK bits for each PDSCH slot, and then multiplexes the PBI bits for each PDSCH slot. In some other implementations, the UE first multiplexes the PBI bits for each PDSCH slot, and then multiplexes the ACK / NACK bits for each PDSCH slot. In some other implementations, the UE multiplexes ACK / NACK and PBI for the first PDSCH slot, and then multiplexes the next PDSCH slot corresponding to the ACK / NACK feedback.

[0136] Option 3-2: PBI reporting associated with ACK / NACK

[0137] In some implementations, the UE reports PBI and ACK / NACK via different PUCCH or PUSCH resources configured by the network entity. In some implementations, the network entity configures or indicates separate PUCCH resources for PBI and ACK / NACK feedback via RRC or DCI. In some other implementations, the network entity configures PUCCH resources for ACK / NACK feedback and PUSCH for PBI feedback. In some other implementations, the network entity configures PUCCH resources for PBI feedback and PUSCH for ACK / NACK feedback.

[0138] Figure 1 – Figure 20 The operations described herein are examples intended to aid understanding of example implementations and should not be used to limit potential implementations or to limit the scope of the claims. Some implementations may include additional operations, fewer operations, operations performed in parallel or in a different order, and operations performed differently.

[0139] The foregoing disclosure provides illustrations and descriptions, but is not intended to be exhaustive or to limit the various aspects to the precise forms disclosed. Modifications and variations may be made based on the above disclosure, or modifications and variations may be obtained from the practice of these aspects. Although aspects of the present disclosure have been described with respect to various examples, any combination of aspects from any example is also within the scope of the present disclosure. The examples in this disclosure are provided for teaching purposes only. Alternatively, or in addition to other examples described herein, the examples also include any combination of the following implementation options (listed as clauses for clarity).

[0140] Terms

[0141] Clause 1. A method of wireless communication at a user equipment (UE), comprising: receiving, via control signaling from a network entity, a channel state information (CSI) reference signal (CSI-RS) reporting configuration indicating at least one CSI-RS resource and including a power backoff indicator (PBI) reporting configuration; receiving the at least one CSI-RS resource; and sending a PBI report to the network entity in a CSI report, the PBI report including one or more power backoff indicators (PBIs) based on measurements of the PBI reporting configuration and the at least one CSI-RS resource.

[0142] Clause 2. The method of clause 1, further comprising: sending a UE capability message from the UE to the network entity, wherein the UE capability message indicates one or more of the following elements: an indication that the UE supports generation of the PBI report, a maximum number of configured CSI-RS resources that the UE can support for the PBI report, or a maximum number of CSI-RS resources in a time slot that the UE can support for the PBI report.

[0143] Clause 3. The method of any of clauses 1 to 2, wherein the PBI report comprises: a wideband PBI across all codewords for the CSI report, or a wideband PBI per codeword for the CSI report.

[0144] Clause 4. The method of any of clauses 1-3, further comprising: determining a wideband channel quality indicator (CQI) based on the measurement of the at least one CSI-RS resource; and determining the one or more PBIs based on the wideband CQI.

[0145] Clause 5. The method of any one of clauses 1-4, further comprising: determining at least one subband channel quality indicator (CQI) based on the measurement of the at least one CSI-RS resource and the configuration of the at least one subband CQI in the CSI reporting configuration; and determining a transmission power backoff based on the at least one subband CQI, wherein the one or more PBIs indicate the transmission power backoff.

[0146] Clause 6. The method of any one of clauses 1-5, further comprising: obtaining a subband configuration from the PBI report configuration; and including one or more subband PBIs in the PBI report based on the subband configuration, wherein the one or more subband PBIs indicate a subband PBI for all codewords across the subband of the at least one CSI-RS or for each codeword of the subband.

[0147] Clause 7. A method as described in any of clauses 1-7, wherein sending the PBI report includes at least one of: sending the one or more PBIs in a short physical uplink control channel (PUCCH) transmission, sending the one or more PBIs in CSI part 1 in a long PUCCH transmission or a physical uplink shared channel (PUSCH) transmission, sending the one or more PBIs in CSI part 2 in the long PUCCH or the PUSCH, or sending a first subset of the one or more PBIs in the CSI part 1 and sending a second subset of the one or more PBIs in the CSI part 2.

[0148] Clause 8. A method as described in any of clauses 1-7, wherein the CSI reporting configuration includes a CQI subset restriction, the method further comprising: determining a CQI based on the measurement of the at least one CSI-RS, the CQI being selected from a CQI subset that excludes the CQI indicated in the CQI subset restriction; and determining the one or more PBIs based on a difference between a measured signal-to-interference ratio (SINR) and an operating SINR plus an offset associated with the CQI.

[0149] Clause 9. A method as described in any of clauses 1-8, further comprising: populating fields of the CSI report to include a reported channel quality indicator (CQI) based on the measurement of the at least one CSI-RS resource; including the PBI report in the CSI report when the reported CQI is the highest candidate CQI in the list of possible CQIs; and omitting the PBI report from the CSI report or populating the PBI report with a default value when the reported CQI is different from the highest candidate CQI.

[0150] Clause 10. The method of any of clauses 1-9, further comprising: receiving information indicating at least one target spectral efficiency via the control signaling; and determining the one or more PBIs based on the at least one target spectral efficiency.

[0151] Clause 11. The method as described in any of clauses 1-10 further includes: receiving a list of candidate power offsets between the at least one CSI-RS and a physical downlink shared channel (PDSCH) for at least one CSI-RS resource via the control signaling; and selecting the one or more PBIs for the PBI report to indicate one or more selected power offsets from the list of candidate power offsets.

[0152] Clause 12. The method of clause 1, further comprising generating the CSI report to include a plurality of CQIs corresponding to a plurality of candidate power offsets in the list of candidate power offsets.

[0153] Clause 13. A method as described in Clause 12, wherein the CSI report includes: a common rank indicator (RI) for the multiple candidate power offsets or corresponding RIs corresponding to the multiple candidate power offsets; and a common precoder matrix indicator (PMI) for the multiple candidate power offsets or corresponding PMIs corresponding to the multiple candidate power offsets.

[0154] Clause 14. A method as described in any of clauses 1-13, wherein the control signaling indicates a list of CSI-RS resources with different power offsets between the CSI-RS and the physical downlink shared channel (PDSCH), the method further comprising: sending a CSI-RS report with a CSI-RS resource indicator (CRI) indicating the recommended CSI-RS; or sending the CSI report including more than one CQI corresponding to all CSI-RS resources with different power offsets.

[0155] Clause 15. The method of clause 1, wherein the control signaling further indicates that the at least one CSI-RS resource is from the same antenna port or the at least one CSI-RS resource is from the bandwidth or frequency domain density.

[0156] Clause 16. A method as described in any of clauses 1-15, wherein the control signaling indicates a list of CSI-RS resources having different power offsets between the CSI-RS and the physical downlink shared channel (PDSCH), further comprising: determining how many CSI processing units are required for the CSI report based on the list of CSI-RS resources; and sending information to the network entity indicating that the expected processing delay for the CSI report exceeds the processing delay for the CSI report to report CSI for the CSI-RS resources at one power offset.

[0157] Clause 17. The method as described in any of clauses 1-16 further includes: receiving a media access control (MAC) control element (CE) or downlink control information (DCI) indicating at least one of the following elements: a transmission power offset between the at least one CSI-RS resource and the PDSCH; a transmission power offset between the at least one CSI-RS resource and a synchronization signal block (SSB); a transmission power of at least one SSB; an additional power backoff for the PDSCH; an additional power backoff for the at least one CSI-RS resource; or an additional power backoff for the at least one SSB.

[0158] Clause 18. The method of clause 17, further comprising receiving the DCI based on a cell radio network temporary identifier (C-RNTI) or a dedicated RNTI.

[0159] Clause 19. The method of any of clauses 1-18, further comprising: receiving control signaling from the network entity requesting a PDSCH-based PBI report; and sending at least one PBI report based on the PDSCH.

[0160] Clause 20. The method of clause 19, further comprising: sending the PBI report and an acknowledgement / non-acknowledgement (ACK / NACK) for the PDSCH, wherein the PBI report and the ACK / NACK are sent on the same PUCCH resource or PUSCH, or wherein the PBI report is sent on one PUCCH resource or PUSCH and the ACK / NACK is sent on different PUCCH resources or PUSCHs.

[0161] Clause 21. A method of wireless communication at a network entity, comprising: sending a CSI reporting configuration indicating at least one channel state information (CSI) reference signal (CSI-RS) resource and including a power backoff indicator (PBI) reporting configuration to a user equipment (UE) via control signaling; sending the at least one CSI-RS resource; and receiving a CSI report from the UE, the CSI report including a PBI report, the PBI report including one or more power backoff indicators (PBIs).

[0162] Clause 22. The method of clause 21, further comprising: setting a transmission power of a physical downlink shared channel based on the one or more power PBIs.

[0163] Clause 23. The method as described in clause 21 or 22 further includes: sending a media access control (MAC) control element (CE) or downlink control information (DCI) indicating at least one of the following elements: a power offset between at least one CSI-RS resource and the PDSCH; a power offset between at least one CSI-RS resource and a synchronization signal block (SSB); a transmit power of the at least one SSB; an additional power backoff for the PDSCH; an additional power backoff for the at least one CSI-RS resource; or an additional power backoff for the at least one SSB.

[0164] Clause 24. An apparatus comprising: a communication unit; and a processing system configured to control the communication unit to implement any of the methods recited in clauses 1-23.

[0165] Clause 25. An apparatus comprising a processor configured to cause a user equipment (UE) to: receive control signaling configuring at least one channel state information (CSI) report configuration, the at least one channel state information (CSI) report configuration configuring at least a power backoff indicator (PBI) report and at least one CSI reference signal (CSI-RS) resource; receive the at least one CSI-RS resource; and send a CSI report including at least a PBI report, the PBI report being based on the configured CSI report and the received at least one CSI-RS resource.

[0166] Clause 26. The apparatus of clause 25, wherein the UE transmits UE capabilities indicating at least one of: whether the UE supports PBI reporting; a maximum number of configured CSI-RS resources for PBI reporting; a maximum number of CSI-RS resources in a time slot for PBI reporting.

[0167] Clause 27. The apparatus of clause 25, wherein the UE sends wideband PBI across all codewords for CSI reporting.

[0168] Clause 28. The apparatus of clause 25, wherein the UE sends a wideband PBI per codeword for CSI reporting.

[0169] Clause 29. The apparatus of clauses 27 to 28, wherein the UE determines the PBI based on a reported wideband channel quality indicator (CQI).

[0170] Clause 30. The apparatus of clauses 27 to 28, wherein the UE determines the PBI based on at least one of the reported sub-band CQIs.

[0171] Clause 31. The apparatus of clause 25, wherein the UE sends sub-band PBI across all codewords for CSI reporting.

[0172] Clause 32. The apparatus of clause 25, wherein the UE sends a sub-band PBI per codeword for CSI reporting.

[0173] Clause 33. The apparatus of clauses 31 to 32, wherein the UE receives control signaling indicating the subband configuration for PBI reporting.

[0174] Clause 34. The apparatus of clauses 27 to 32, wherein the UE transmits the PBI in a short PUCCH.

[0175] Clause 35. An apparatus as defined in clauses 27 to 32, wherein the UE transmits the PBI in CSI part 1 in a long PUCCH or PUSCH.

[0176] Clause 36. An apparatus as defined in clauses 27 to 32, wherein the UE transmits the PBI in CSI part 2 in a long PUCCH or PUSCH.

[0177] Clause 37. An apparatus as defined in clauses 27 to 32, wherein the UE transmits a subset of the PBI in CSI part 1 in a long PUCCH or PUSCH and transmits the other PBI in CSI part 2 in a long PUCCH or PUSCH.

[0178] Clause 38. The apparatus of clause 25, wherein the UE receives control signaling indicating CQI subset restriction.

[0179] Clause 39. The apparatus of clause 25, wherein the UE sends the PBI when the reported CQI used for the PBI calculation is the highest candidate CQI.

[0180] Clause 40. The apparatus of clause 25, wherein the UE discards the PBI report when the reported CQI used for the PBI calculation is different from the highest candidate CQI.

[0181] Clause 41. The apparatus of clause 25, wherein the UE sends the PBI based on a default value when the reported CQI used for the PBI calculation is different than a highest candidate CQI.

[0182] Clause 42. The apparatus of clause 25, wherein the UE receives control signaling indicating at least one target spectral efficiency.

[0183] Clause 43. The apparatus of clause 41, wherein the UE sends the PBI indicating the PDSCH transmission power backoff to meet the target spectral efficiency.

[0184] Clause 44. The apparatus of clause 25, wherein the UE receives control signaling configuring a list of candidate power offsets between the CSI-RS and PDSCH for at least one CSI-RS resource.

[0185] Clause 45. The apparatus of clause 25, wherein the UE sends a CSI report with a PBI indicating one of the candidate power offsets from the list of power offsets.

[0186] Clause 46. The apparatus of clause 45, wherein the UE sends a CSI report with more than one CQI corresponding to the candidate power offset from the list of power offsets.

[0187] Clause 47. The apparatus of clause 46, wherein the UE sends the CSI report with a common rank indicator (RI) and a precoder matrix indicator (PMI).

[0188] Clause 48. The apparatus of clause 46, wherein the UE sends the CSI report with a common PMI indicating a full rank precoder and more than one RI corresponding to the candidate power offset from the list of power offsets.

[0189] Clause 49. The apparatus of clause 25, wherein the UE receives control signaling configuring a list of CSI-RS resources with different power offsets between the CSI-RS and PDSCH.

[0190] Clause 50. The apparatus of clause 49, wherein the UE receives control signaling configuring the CSI-RS resources from the same antenna port.

[0191] Clause 51. The apparatus of clause 49, wherein the UE receives control signaling configuring the CSI-RS resources from the bandwidth and / or frequency domain density.

[0192] Clause 52. The apparatus of clause 49, wherein the UE sends a CSI-RS report with a CSI-RS resource indicator (CRI) indicating the recommended CSI-RS.

[0193] Clause 53. The apparatus of clause 49, wherein the UE transmits the CSI-RS report comprising more than one CQI corresponding to all CSI-RS resources having different power offsets.

[0194] Clause 54. The apparatus of clause 53, wherein the UE sends the CSI report with a common RI and PMI.

[0195] Clause 55. The apparatus of clause 53, wherein the UE sends the CSI report with a common PMI indicating a full rank precoder and more than one RI corresponding to the candidate power offset from the list of power offsets.

[0196] Clause 56. The apparatus of clauses 44 to 55, wherein the UE determines that the CSI report occupies 1 CSI processing unit.

[0197] Clause 57. The apparatus of clause 56, wherein the UE transmits UE capabilities indicating an additional processing delay for CSI reporting above a minimum processing delay for CSI reporting with one power offset.

[0198] Clause 58. The apparatus of clauses 44 to 55, wherein the UE determines that the CSI report occupies M CSI processing units, where M is the number of candidate power offsets or CSI-RS resources.

[0199] Clause 59. An apparatus as defined in clauses 44 to 55, wherein the UE sends a UE capability indicating a CSI processing unit for CSI reporting.

[0200] Clause 60. The apparatus of clause 25, wherein the UE receives a MAC CE or DCI that updates at least one of the following elements: the power offset between at least one CSI-RS resource and a PDSCH; the power offset between at least one CSI-RS resource and an SSB; the transmit power of at least one SSB.

[0201] Clause 61. The apparatus of clause 25, wherein the UE receives a MAC CE or DCI indicating at least one of: the additional power backoff for PDSCH; the additional power backoff for at least one CSI-RS resource; the additional power backoff for at least one SSB.

[0202] Clause 62. The apparatus of clauses 60 to 61, wherein the UE receives the DCI based on a cell radio network temporary identifier (C-RNTI).

[0203] Clause 63. The apparatus of clauses 60 to 61, wherein the UE receives the DCI based on a dedicated RNTI.

[0204] Clause 64. The apparatus of clause 63, wherein the UE receives control signaling configuring the dedicated RNTI.

[0205] Clause 65. The apparatus of clause 25, wherein the UE receives control signaling indicating PDSCH-based PBI reporting.

[0206] Clause 66. The apparatus of clause 65, wherein the UE transmits at least one PBI based on the received PDSCH.

[0207] Clause 67. The apparatus of clause 65, wherein the UE transmits the PBI and ACK / NACK for the PDSCH via the same PUCCH resources or PUSCH.

[0208] Clause 68. The apparatus of clause 65, wherein the UE transmits the PBI and ACK / NACK for the PDSCH via different PUCCH resources or PUSCH.

[0209] Clause 69. The apparatus of clause 65, wherein the UE receives control signaling configuring PUCCH resources or PUSCH for PBI reporting and / or ACK / NACK reporting.

[0210] Clause 70. An apparatus comprising a processor configured to cause a base station (BS) to: send control signaling configuring at least one channel state information (CSI) report configuration, the at least one channel state information (CSI) report configuration configuring at least a power backoff indicator (PBI) report and at least one CSI reference signal (CSI-RS) resource; send the at least one CSI-RS resource; and receive a CSI report comprising at least a PBI report, the PBI report being based on the configured CSI report and the received at least one CSI-RS resource.

[0211] Clause 71. The apparatus of clause 70, wherein the BS receives UE capabilities indicating at least one of: whether the UE supports PBI reporting; a maximum number of configured CSI-RS resources for PBI reporting; a maximum number of CSI-RS resources in a time slot for PBI reporting.

[0212] Clause 72. The apparatus of clause 70, wherein the BS receives wideband PBI across all codewords for CSI reporting.

[0213] Clause 73. The apparatus of clause 70, wherein the BS receives a wideband PBI per codeword for CSI reporting.

[0214] Clause 74. The apparatus of clause 70, wherein the BS receives sub-band PBI across all codewords for CSI reporting.

[0215] Clause 75. The apparatus of clause 70, wherein the BS receives sub-band PBI per codeword for CSI reporting.

[0216] Clause 76. The apparatus of clauses 74 to 75, wherein the BS sends control signaling indicating the subband configuration for PBI reporting.

[0217] Clause 77. The apparatus of clauses 72 to 75, wherein the BS receives the PBI in a short PUCCH.

[0218] Clause 78. The apparatus of clauses 72 to 75, wherein the BS receives the PBI in CSI part 1 in a long PUCCH or PUSCH.

[0219] Clause 79. The apparatus of clauses 72 to 75, wherein the BS receives the PBI in CSI part 2 in a long PUCCH or PUSCH.

[0220] Clause 80. The apparatus of clauses 72 to 75, wherein the BS receives a subset of the PBIs in CSI part 1 in a long PUCCH or PUSCH and receives the other PBIs in CSI part 2 in a long PUCCH or PUSCH.

[0221] Clause 81. The apparatus of clause 70, wherein the BS sends control signaling indicating the CQI subset restriction.

[0222] Clause 82. The apparatus of clause 70, wherein the BS receives the PBI when the reported CQI used for the PBI calculation is the highest candidate CQI.

[0223] Clause 83. The apparatus of clause 70, wherein the BS receives the PBI based on a default value when the reported CQI used for the PBI calculation is different than the highest candidate CQI.

[0224] Clause 84. The apparatus of clause 70, wherein the BS sends control signaling indicating at least one target spectral efficiency.

[0225] Clause 85. The apparatus of clause 84, wherein the BS receives the PBI indicating a power backoff of the PDSCH transmission to meet the target spectral efficiency.

[0226] Clause 86. The apparatus of clause 70, wherein the BS transmits control signaling configuring a list of candidate power offsets between the CSI-RS and PDSCH for at least one CSI-RS resource.

[0227] Clause 87. The apparatus of clause 86, wherein the BS receives a CSI report with a PBI indicating one of the candidate power offsets from the list of power offsets.

[0228] Clause 88. The apparatus of clause 86, wherein the BS receives a CSI report having more than one CQI corresponding to the candidate power offset from the list of power offsets.

[0229] Clause 89. The apparatus of clause 88, wherein the BS receives the CSI report with a common rank indicator (RI) and a precoder matrix indicator (PMI).

[0230] Clause 90. The apparatus of clause 88, wherein the BS receives the CSI report with a common PMI indicating a full rank precoder and more than one RI corresponding to the candidate power offset from the list of power offsets.

[0231] Clause 91. The apparatus of clause 70, wherein the BS sends control signaling configuring a list of CSI-RS resources with different power offsets between the CSI-RS and PDSCH.

[0232] Clause 92. The apparatus of clause 91, wherein the BS sends control signaling configuring the CSI-RS resources from the same antenna port.

[0233] Clause 93. The apparatus of clause 91, wherein the BS sends control signaling configuring the CSI-RS resources from the bandwidth and / or frequency domain density.

[0234] Clause 94. The apparatus of clause 91, wherein the BS receives a CSI-RS report with a CSI-RS resource indicator (CRI) indicating the recommended CSI-RS.

[0235] Clause 95. The apparatus of clause 91, wherein the BS receives the CSI-RS report including more than one CQI corresponding to all CSI-RS resources having different power offsets.

[0236] Clause 96. The apparatus of clause 95, wherein the BS receives the CSI report with a common RI and PMI.

[0237] Clause 97. The apparatus of clause 95, wherein the BS receives the CSI report with a common PMI indicating a full rank precoder and more than one RI corresponding to the candidate power offset from the list of power offsets.

[0238] Clause 98. The apparatus of clauses 86 to 97, wherein the BS determines that the CSI report occupies 1 CSI processing unit.

[0239] Clause 99. The apparatus of clause 98, wherein the BS receives UE capabilities indicating an additional processing delay for CSI reporting above a minimum processing delay for CSI reporting with one power offset.

[0240] Clause 100. The apparatus of clauses 86 to 97, wherein the BS determines that the CSI report occupies M CSI processing units, where M is the number of candidate power offsets or CSI-RS resources.

[0241] Clause 101. The apparatus of clauses 86 to 97, wherein the BS receives a UE capability indicating a CSI processing unit for CSI reporting.

[0242] Clause 102. The apparatus according to clause 70, wherein the BS sends a MAC CE or DCI that updates at least one of the following elements: the power offset between at least one CSI-RS resource and the PDSCH; the power offset between at least one CSI-RS resource and the SSB; the transmission power of at least one SSB.

[0243] Clause 103. The apparatus of clause 70, wherein the BS sends a MAC CE or DCI indicating at least one of: the additional power backoff for PDSCH; the additional power backoff for at least one CSI-RS resource; the additional power backoff for at least one SSB.

[0244] Clause 104. The apparatus of clauses 103 to 84, wherein the BS sends the DCI based on a cell radio network temporary identifier (C-RNTI).

[0245] Clause 105. The apparatus of clauses 103 to 104, wherein the BS sends the DCI based on a dedicated RNTI.

[0246] Clause 106. The apparatus of clause 105, wherein the BS sends control signaling configuring the dedicated RNTI.

[0247] Clause 107. The apparatus of clause 70, wherein the BS sends control signaling indicating PDSCH-based PBI reporting.

[0248] Clause 108. The apparatus of clause 107, wherein the BS receives at least one PBI based on the received PDSCH.

[0249] Clause 109. The apparatus of clause 107, wherein the BS receives the PBI and ACK / NACK for the PDSCH over the same PUCCH resources or PUSCH.

[0250] Clause 110. The apparatus of clause 107, wherein the BS receives the PBI and ACK / NACK for the PDSCH via different PUCCH resources or PUSCH.

[0251] Clause 111. The apparatus of clause 107, wherein the BS sends control signaling.

[0252] Another innovative aspect of the subject matter described in this disclosure can be implemented as a wireless communication device of a UE or a network entity. The wireless communication device may include at least one interface and a processing system communicatively coupled to the at least one interface. The processing system may be configured to implement any of the above clauses.

[0253] Another innovative aspect of the subject matter described in this disclosure can be implemented as a portable electronic device that includes a wireless communication device, multiple antennas coupled to at least one transceiver for wirelessly transmitting signals output from the at least one transceiver, and a housing that surrounds at least a portion of the wireless communication device, the at least one transceiver, and the multiple antennas. The wireless communication device can include at least one interface and a processing system communicatively coupled to the at least one interface. The processing system can be configured to implement any of the above clauses.

[0254] Another innovative aspect of the subject matter described in this disclosure can be implemented as a machine-readable medium having processor-readable instructions stored therein that, when executed by a processing system of a UE, cause the UE to implement any of the above clauses.

[0255] Another innovative aspect of the subject matter described in this disclosure can be implemented as an apparatus. The apparatus may include components for implementing any of the above clauses.

[0256] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software. As used herein, the phrase "based on" is intended to be broadly interpreted to mean "based at least in part on."

[0257] Some aspects are described herein in conjunction with thresholds. As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc.

[0258] As used herein, a phrase referring to "at least one of" or "one or more of" a list of items refers to any combination of those items, including individual members. For example, "at least one of: a, b, or c" is intended to encompass the following possibilities: only a, only b, only c, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a, b, and c.

[0259] In this disclosure, the term "can" indicates a capability, or alternatively, a possible implementation option. The term "may" indicates a permission, or a possible implementation option.

[0260] The various illustrative components, logic, logic blocks, modules, circuits, operations, and algorithmic processes described in conjunction with the implementations disclosed herein may be implemented as electronic hardware, firmware, software, or a combination of hardware, firmware, or software, including the structures disclosed in this specification and their structural equivalents. The interchangeability of hardware, firmware, and software has been generally described in terms of functionality and illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented in hardware, firmware, or software depends on the specific application and design constraints imposed on the overall system.

[0261] The hardware and data processing equipment for implementing the various illustrative components, logic, logic blocks, modules, and circuits described in conjunction with the various aspects disclosed herein can be implemented or executed using a general-purpose single-chip or multi-chip processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor can be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration. In some implementations, specific processes, operations, and methods can be performed by circuit systems specific to a given function.

[0262] As described above, in some aspects, the implementation of the subject matter described in this specification may be implemented as software. For example, the various functions of the components disclosed herein, or the various boxes or steps of the methods, operations, processes or algorithms disclosed herein, may be implemented as one or more modules of one or more computer programs. Such computer programs may include non-transitory processor-executable instructions or computer-executable instructions encoded on one or more tangible processor-readable storage media or computer-readable storage media for execution by a data processing equipment including a component of the device described herein, or for controlling the operation of the data processing equipment. By way of example and not limitation, such storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other medium that can be used to store program codes in the form of instructions or data structures. The above combination should also be included within the scope of storage media.

[0263] As used herein, the terms "user equipment," "wireless communication device," "mobile communication device," "communication device," or "mobile device" refer to any or all of a cellular telephone, a smartphone, a portable computing device, a personal or mobile multimedia player, a laptop computer, a tablet computer, a smartbook, an Internet of Things (IoT) device, a handheld computer, a wireless email receiver, a multimedia Internet-enabled cellular telephone, a wireless game controller, a display subsystem, a driver assistance system, a vehicle controller, a vehicle system controller, a vehicle communication system, an infotainment system, a vehicle telematics system or subsystem, a vehicle display system or subsystem, a vehicle data controller or router, and similar electronic devices that include a programmable processor and memory and circuitry configured to perform the operations described herein.

[0264] Various modifications to the implementations described in this disclosure may be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other implementations without departing from the spirit or scope of this disclosure. Accordingly, the claims are not intended to be limited to the implementations shown herein, but are to be accorded the widest scope consistent with this disclosure, the principles, and the novel features disclosed herein.

[0265] In addition, various features described in this specification in the context of separate implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations, either individually or in any suitable subcombination. Thus, although features may be described above as functioning in a particular combination and even initially claimed as such, in some cases one or more features from a claimed combination may be deleted from the combination, and a claimed combination may involve subcombinations or variations of subcombinations.

[0266] Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring that such operations be performed in the particular order shown or in a sequential order, or that all illustrated operations be performed to achieve the desired result. In addition, the accompanying drawings may schematically depict one or more example processes in the form of a flow chart or flowchart. However, other operations not depicted may be incorporated into the schematically illustrated example processes. For example, one or more additional operations may be performed before, after, simultaneously with, or between any illustrated operations. In some cases, multitasking and parallel processing may be advantageous. In addition, the separation of the various system components in the implementation described above should not be understood as requiring such separation in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products. In addition, other implementations are within the scope of the appended claims. In some cases, the actions set forth in the claims may be performed in different orders and still achieve the desired result.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: receiving, via control signaling from a network entity, a CSI reporting configuration indicating at least one channel state information (CSI) reference signal (CSI-RS) resource and including a power backoff indicator (PBI) reporting configuration; receiving the at least one CSI-RS resource; and A PBI report is sent to the network entity in a CSI report, the PBI report including one or more power backoff indicators (PBIs) based on the PBI reporting configuration and the measurement of the at least one CSI-RS resource.

2. The method of claim 1, further comprising: A UE capability message is sent from the UE to the network entity, wherein the UE capability message indicates one or more of the following elements: an indication that the UE supports generation of the PBI report, The maximum number of configured CSI-RS resources that the UE can support for the PBI reporting, or The UE can support a maximum number of CSI-RS resources in a time slot for the PBI report.

3. The method of any one of claims 1 or 2, wherein the PBI report comprises: Wideband PBI across all codewords for the CSI report, or Wideband PBI per codeword used for the CSI report.

4. The method according to any one of claims 1 to 3, further comprising: determining a wideband channel quality indicator (CQI) based on the measurement of the at least one CSI-RS resource; as well as The one or more PBIs are determined based on the wideband CQI.

5. The method according to any one of claims 1 to 4, further comprising: determining, based on the measurement of the at least one CSI-RS resource and a configuration of at least one subband channel quality indicator (CQI) in the CSI reporting configuration, the at least one subband CQI; as well as A transmit power backoff is determined based on the at least one subband CQI, wherein the one or more PBIs indicate the transmit power backoff.

6. The method according to any one of claims 1 to 5, further comprising: Obtaining a subband configuration from the PBI report configuration; as well as One or more subband PBIs are included in the PBI report based on the subband configuration, wherein the one or more subband PBIs indicate a subband PBI for all codewords across a subband of the at least one CSI-RS or for each codeword of the subband.

7. The method of any one of claims 1 to 6, wherein sending the PBI report comprises at least one of the following: sending the one or more PBIs in a short Physical Uplink Control Channel (PUCCH) transmission, transmitting the one or more PBIs in CSI part 1 in a long PUCCH transmission or a physical uplink shared channel PUSCH transmission, sending the one or more PBIs in CSI part 2 in the long PUCCH or the PUSCH, or A first subset of the one or more PBIs is sent in the CSI part 1 and a second subset of the one or more PBIs is sent in the CSI part 2.

8. The method according to any one of claims 1 to 7, wherein the CSI reporting configuration includes CQI subset restriction, the method further comprising: determining a CQI based on the measurement of the at least one CSI-RS, the CQI selected from a CQI subset excluding the CQI indicated in the CQI subset restriction; as well as The one or more PBIs are determined based on a difference between a measured signal-to-noise ratio (SINR) and an operating SINR plus an offset associated with the CQI.

9. The method of any one of claims 1 to 8, further comprising: populating fields of the CSI report to include a reported channel quality indicator (CQI) based on the measurement of the at least one CSI-RS resource; including the PBI report in the CSI report when the reported CQI is a highest candidate CQI in a list of possible CQIs; as well as When the reported CQI is different from the highest candidate CQI, the PBI report is omitted from the CSI report or populated with a default value.

10. The method according to any one of claims 1 to 9, further comprising: receiving, via the control signaling, information indicating at least one target spectral efficiency; as well as The one or more PBIs are determined based on the at least one target spectral efficiency.

11. The method of any one of claims 1 to 10, further comprising: receiving, via the control signaling, a list of candidate power offsets between the at least one CSI-RS and a physical downlink shared channel (PDSCH) for at least one CSI-RS resource; as well as The one or more PBIs for the PBI report are selected to indicate one or more selected power offsets from the list of candidate power offsets.

12. The method of any one of claims 1 to 11, further comprising: The CSI report is generated to include a plurality of CQIs corresponding to a plurality of candidate power offsets in the list of candidate power offsets.

13. The method of claim 12, wherein the CSI report comprises: a common rank indicator (RI) for the plurality of candidate power offsets or respective RIs corresponding to the plurality of candidate power offsets; as well as A common precoder matrix indicator (PMI) for the plurality of candidate power offsets or respective PMIs corresponding to the plurality of candidate power offsets.

14. The method according to any one of claims 1 to 13, wherein the control signaling indicates a list of CSI-RS resources having different power offsets between the CSI-RS and the physical downlink shared channel (PDSCH), the method further comprising: sending a CSI-RS report with a CSI-RS resource indicator CRI indicating a recommended CSI-RS; or The CSI report including more than one CQI corresponding to all of the CSI-RS resources having different power offsets is transmitted.

15. The method according to any one of claims 1 to 14, wherein the control signaling further indicates that the at least one CSI-RS resource is from the same antenna port or the at least one CSI-RS resource is from the bandwidth or frequency domain density.

16. The method according to any one of claims 1 to 15, wherein the control signaling indicates a list of CSI-RS resources having different power offsets between the CSI-RS and the physical downlink shared channel (PDSCH), further comprising: determining how many CSI processing units are required for the CSI report based on the list of CSI-RS resources; as well as Information is sent to the network entity indicating that an expected processing delay for the CSI report exceeds the processing delay for the CSI report to report CSI for a CSI-RS resource at a power offset.

17. The method of any one of claims 1 to 16, further comprising: Receiving a media access control (MAC) control element (CE) or downlink control information (DCI) indicating at least one of the following elements: a transmission power offset between the at least one CSI-RS resource and the PDSCH; A transmission power offset between the at least one CSI-RS resource and a synchronization signal block SSB; The transmission power of at least one SSB; Additional power backoff for the PDSCH; additional power backoff for the at least one CSI-RS resource; or Additional power backoff for the at least one SSB.

18. The method of any one of claims 1 to 17, further comprising: receiving control signaling requesting a PDSCH-based PBI report from the network entity; as well as At least one PBI report based on the PDSCH is sent.

19. The method of claim 18, further comprising: The PBI report and an ACK / NACK for the PDSCH are transmitted, wherein the PBI report and the ACK / NACK are transmitted on the same PUCCH resource or PUSCH, or wherein the PBI report is transmitted on one PUCCH resource or PUSCH and the ACK / NACK is transmitted on different PUCCH resources or PUSCHs.

20. A method of wireless communication at a network entity, comprising: Sending a CSI reporting configuration indicating at least one channel state information (CSI) reference signal (CSI-RS) resource and including a power backoff indicator (PBI) reporting configuration to a user equipment (UE) via control signaling; sending the at least one CSI-RS resource; as well as A CSI report is received from the UE, the CSI report including a PBI report including one or more power backoff indicators (PBIs).

21. The method of claim 20, further comprising: A transmission power of a physical downlink shared channel is set based on the one or more power PBIs.

22. The method of claim 20 or 21, further comprising: Sending a media access control (MAC) control element (CE) or downlink control information (DCI) indicating at least one of the following elements: a power offset between at least one CSI-RS resource and the PDSCH; a power offset between at least one CSI-RS resource and a synchronization signal block (SSB); a transmission power of the at least one SSB; Additional power backoff for the PDSCH; additional power backoff for the at least one CSI-RS resource; or Additional power backoff for the at least one SSB.

23. An apparatus comprising: Communication unit; as well as A processing system configured to control the communication unit to implement the method according to any one of claims 1 to 22.

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