Channel status information reporting for some frequency bands

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration message from a base station, and the configuration message may include an indication of one or more partial frequency bands for channel state information reporting. Each of the one or more partial frequency bands may be smaller than a system bandwidth and include a plurality of frequency domain units associated with a precoder. The UE may select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message, and calculate channel state information including a linear combination of the one or more antenna ports selected for each partial frequency band. The UE may send channel state information including an indication of the selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

Description

Technical Field

[0001] The following relates generally to wireless communications, and more particularly, to channel state information reporting for a portion of a frequency band. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems that may be referred to as new radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports the communication of multiple communication devices that may also be referred to as user equipment (UE).

[0003] The base station may configure the UE for uplink or downlink communications. However, the base station may misconfigure the UE based on feedback reported by the UE. Summary of the invention

[0004] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting channel state information reporting for partial frequency bands. In general, the described techniques provide improvements in the granularity and quality of channel state information (CSI). For example, a user equipment (UE) may provide CSI to a base station on a per-partial frequency band basis, and the base station may configure the UE based on the CSI.

[0005] The UE may receive a configuration message from a base station, and the configuration message may include an indication of one or more partial frequency bands for CSI reporting. Each of the one or more partial frequency bands may be smaller than the system bandwidth and include multiple frequency domain units (e.g., subbands, resource blocks, etc.) associated with a precoder. The UE may select one or more antenna ports (e.g., CSI reference signal (CSI-RS) ports) for each of the one or more partial frequency bands based on the configuration message. For example, the configuration message may indicate a group of antenna ports, multiple antenna ports, a minimum number of antenna ports, or a maximum number of antenna ports, and the UE may select one or more antenna ports based on the configuration message. The UE may calculate CSI including a linear combination of one or more antenna ports selected for each partial frequency band. The CSI may be calculated based on receiving the configuration message, and the UE may send the CSI to the base station. The CSI may include an indication of the selected antenna port and the linear combination coefficient for each of the one or more partial frequency bands.

[0006] A method for wireless communication at a UE is described. The method may include: receiving a configuration message including an indication of one or more partial frequency bands for channel state information reporting from a base station, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a set of frequency domain units associated with a precoder, selecting one or more antenna ports for each of the one or more partial frequency bands based on the configuration message, calculating channel state information including a linear combination of the one or more antenna ports selected for each partial frequency band based on receiving the configuration message, and sending channel state information including at least an indication of the selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

[0007] A device for wireless communication at a UE is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the device to: receive a configuration message including an indication of one or more partial frequency bands for channel state information reporting from a base station, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder, select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message, calculate channel state information including a linear combination of the one or more antenna ports selected for each partial frequency band based on receiving the configuration message, and send channel state information including at least an indication of the selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

[0008] Another apparatus for wireless communication at a UE is described. The apparatus may include components for: receiving a configuration message including an indication of one or more partial frequency bands for channel state information reporting from a base station, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a set of frequency domain units associated with a precoder, selecting one or more antenna ports for each of the one or more partial frequency bands based on the configuration message, calculating channel state information including a linear combination of the one or more antenna ports selected for each partial frequency band based on receiving the configuration message, and sending channel state information including at least an indication of the selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

[0009] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receive a configuration message including an indication of one or more partial frequency bands for channel state information reporting from a base station, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a set of frequency domain units associated with a precoder, select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message, calculate channel state information including a linear combination of the one or more antenna ports selected for each partial frequency band based on receiving the configuration message, and send channel state information including at least an indication of the selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting one or more antenna ports may include operations, features, components, or instructions for selecting a subset of the total number of antenna ports for each of one or more partial frequency bands.

[0011] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a same subset of one or more CSI-RS ports may be selected for each of one or more partial frequency bands.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for calculating channel state information, including separately precoding each of the one or more partial frequency bands.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an indication of one or more partial frequency bands for channel state reporting includes one or more of: a digital amount of the partial frequency band on which the UE may want to perform channel state measurements, or the size of the partial frequency band on which the UE may want to perform channel state measurements, or the ratio of the partial frequency band size to the frequency domain unit size.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a capability message to a base station, the capability message indicating a digital quality of a portion of a frequency band for which the UE may be able to perform channel measurements, wherein the configuration message may be based on the capability message.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an indication of one or more partial frequency bands may depend on an indication of a digital quantity of total antenna ports or a digital quantity of antenna ports to be selected for each of the one or more partial frequency bands, and selection of one or more antenna ports for each partial frequency band may be based on the indicated digital quantity.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the antenna ports include channel state information reference signal (CSI-RS) ports, and the configuration message also includes a joint indication of the partial frequency band and the digital quantity of the CSI-RS port, and selection of one or more antenna ports for each partial frequency band can be based on the joint indication.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the joint indication may include operations, features, components, or instructions for: the number of partial frequency bands, the size of the partial frequency bands, or the ratio of the partial frequency bands to the frequency unit size; and one or more of: the number of total CSI-RS ports or the number of CSI-RS ports to be selected for each partial frequency band.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a report of one or more antenna ports selected for each of one or more partial frequency bands to a base station, wherein the report of the one or more antenna ports selected for each partial frequency band includes: an indication of a first group of antenna ports common to all of the one or more partial frequency bands, and an indication of a second group of antenna ports independently selected for each of the one or more partial frequency bands, wherein the second group of antenna ports for each partial frequency band can be from the first group of antenna ports.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, from a base station, configurations of sizes of the first set of antenna ports and sizes of the second set of antenna ports.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a report of resource selection for channel state measurement for each of one or more partial frequency bands to a base station.

[0021] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a configuration of frequency domain limitations for channel measurement from a base station, and determining that frequency domain limitations for channel measurement may be in place based on the configuration of frequency domain limitations for channel measurement, wherein calculating channel information for each of one or more partial frequency bands includes limiting the channel state measurement to a non-zero power channel state information reference signal within each partial frequency band.

[0022] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a configuration of frequency domain limitations for interference measurements from a base station, and determining that frequency domain limitations for interference measurements may be in place based on the configuration of frequency domain limitations for channel measurements, wherein performing interference measurements on each of one or more partial frequency bands includes limiting the interference measurements to zero or non-zero interference measurement resources within each partial frequency band.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a frequency domain unit in the set of frequency domain units corresponds to a subband size for channel quality indicator (CQI) reporting.

[0024] A method for wireless communication at a base station is described. The method may include sending a configuration message including an indication of one or more partial frequency bands for channel state information reporting to a UE, wherein each of the one or more partial frequency bands is less than a system bandwidth and includes a set of frequency domain units associated with a precoder, based on sending the configuration message and channel state measurements, receiving channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands, and communicating with the UE based on receiving the channel state information for each of the one or more partial frequency bands.

[0025] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor so that the apparatus: sends a configuration message including an indication of one or more partial frequency bands for channel state information reporting to a UE, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a set of frequency domain units associated with a precoder, based on sending the configuration message and channel state measurement, receives channel state information including an indication of an antenna port and a linear combination coefficient for each of the one or more partial frequency bands, and based on receiving the channel state information for each of the one or more partial frequency bands, communicates with the UE.

[0026] Another apparatus for wireless communication at a base station is described. The apparatus may include components for sending a configuration message including an indication of one or more partial frequency bands for channel state information reporting to a UE, wherein each of the one or more partial frequency bands is less than a system bandwidth and includes a set of frequency domain units associated with a precoder, based on sending the configuration message and channel state measurements, receiving channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands, and communicating with the UE based on receiving the channel state information for each of the one or more partial frequency bands.

[0027] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: send a configuration message including an indication of one or more partial frequency bands for channel state information reporting to a UE, wherein each of the one or more partial frequency bands is less than a system bandwidth and includes a set of frequency domain units associated with a precoder, based on sending the configuration message and channel state measurement, receive channel state information including an indication of an antenna port and a linear combination coefficient for each of the one or more partial frequency bands, and based on receiving the channel state information for each of the one or more partial frequency bands, communicate with the UE.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an indication of one or more partial frequency bands for channel state reporting includes one or more of: a digital amount of the partial frequency band on which the UE may want to perform channel state measurements, or the size of the partial frequency band on which the UE may want to perform channel state measurements, or the ratio of the partial frequency band size to the frequency domain unit size.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an indication of one or more partial frequency bands may depend on an indication of a digital quantity of total antenna ports or a digital quantity of antenna ports to be selected for each of the one or more partial frequency bands, and selection of one or more antenna ports for each partial frequency band may be based on the indicated digital quantity.

[0030] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a capability message from a UE, the capability message indicating a digital quality of a portion of a frequency band for which the UE may be able to perform channel measurements, wherein the configuration message may be based on the capability message.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the antenna ports include channel state information reference signal (CSI-RS) ports, and the configuration message also includes a joint indication of the partial frequency band and the digital quantity of the CSI-RS port, and one or more antenna ports for each partial frequency band can be selected based on the joint indication.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the joint indication may include operations, features, components, or instructions for: the number of partial frequency bands, the size of the partial frequency bands, or the ratio of the partial frequency bands to the frequency unit size; and one or more of: the number of total CSI-RS ports or the number of CSI-RS ports to be selected for each partial frequency band.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving from a UE a report on one or more antenna ports selected for each of one or more partial frequency bands, wherein the report on the one or more antenna ports selected for each partial frequency band includes: an indication of a first group of antenna ports common to all of the one or more partial frequency bands, and an indication of a second group of antenna ports independently selected for each of the one or more partial frequency bands, wherein the second group of antenna ports for each partial frequency band may be from the first group of antenna ports.

[0034] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a configuration of the size of the first set of antenna ports and the size of the second set of antenna ports to a UE.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, from a UE, a report of resource selection for channel state measurement for each of one or more partial frequency bands.

[0036] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a configuration of frequency domain restrictions for channel measurement to a UE, and receiving channel state information for channel measurement based on a non-zero power channel state information reference signal within each partial frequency band.

[0037] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a configuration of frequency domain limitations for interference measurement to a UE, and receiving channel state information for interference measurement based on interference measurement resources within each partial frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 An example of a system for wireless communication supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is illustrated.

[0039] Figure 2 An example of a wireless communication system supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is illustrated.

[0040] Figure 3 An example of a channel state information reporting technique supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is illustrated.

[0041] Figure 4 An example of a process flow for supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is illustrated.

[0042] Figure 5 and Figure 6 A block diagram of a device supporting channel state information reporting of a partial frequency band according to various aspects of the present disclosure is shown.

[0043] Figure 7 A block diagram of a channel state information manager supporting channel state information reporting for a partial frequency band according to aspects of the present disclosure is shown.

[0044] Figure 8 A diagram of a system including a device supporting channel state information reporting for a partial frequency band is shown in accordance with aspects of the present disclosure.

[0045] Fig. 9 and Fig.10A block diagram of a device supporting channel state information reporting of a partial frequency band according to various aspects of the present disclosure is shown.

[0046] Fig.11 A block diagram of a channel state information manager supporting channel state information reporting for a partial frequency band according to aspects of the present disclosure is shown.

[0047] Fig.12 A diagram of a system including a device supporting channel state information reporting for a partial frequency band is shown in accordance with aspects of the present disclosure.

[0048] Figures 13 to 16 A flow chart illustrating a method of supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0049] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems can support user equipment (UE) to receive channel state information reference signal (CSI-RS), measure CSI-RS transmission, and transmit channel information (e.g., channel state information, CSI report, etc.) to the base station. In some cases, the CSI-RS can be precoded, and the precoding of the CSI-RS can be based on the spatial and delay reciprocity between the uplink channel and the downlink channel, but the part of the system bandwidth used to send the CSI-RS may have poor spatial and delay reciprocity on the uplink channel and the downlink channel. In some cases, providing channel reports for system bandwidths with poor spatial reciprocity may reduce the channel quality indicated in the channel report. The base station can set a low modulation and coding scheme (MCS) for the system bandwidth based on the low channel quality indicated in the channel report, which may negatively affect the throughput between the UE and the base station.

[0050] In some cases, the UE may receive CSI-RS with frequency selective precoding. Precoded CSI-RS may be received on all FD units (e.g., FD unit 0, FD unit 1, ... FDN3-1) as shown in Table 1. The precoder for a CSI-RS port may be formed by a pair of spatial domain (SD) references (e.g., SD transmit filters) and FD references (e.g., FD transmit filters / weights). The UE may compute the CSI based on observations of port "p" on FD unit "n". For example, for port "p" on FD unit "n", the UE may observe Where "H" is the wireless channel without precoding between the UE and the base station. For each layer, the UE can select a subset of all ports and report a single coefficient for each port across the frequency band. In some cases, the UE can report the CSI of all FD units as a linear combination of the selected ports. The precoding matrix indicator (PMI) of a layer l on any of the N3 FD units can be expressed as in is the size of P x 1, row i k There is only one "1" in the , indicating that port i is selected for layer l k(l) , P is the total number of CSI-RS ports, and c k,l is the linear combination coefficient. In some cases, the UE may use The virtual physical downlink shared channel (PDSCH) represented by is used to calculate the channel quality indicator (CQI), and the actual precoder of the virtual PDSCH can be expressed as:

[0051]

[0052] As shown in Table 1.

[0053]

[0054] Table 1

[0055] According to various aspects described herein, a UE may provide channel information for multiple partial frequency bands associated with a system bandwidth. In some cases, a base station may configure a set of partial frequency bands for a UE, and the UE will provide channel information (e.g., CSI) for the set of partial frequency bands. The UE may use the set of partial frequency bands to measure a reference signal (e.g., CSI-RS) sent by the base station, and provide channel information based on each partial frequency band by sending the CSI coefficients of each partial frequency band to the base station. In some additional or alternative cases, a base station may configure a set of antenna ports (e.g., CSI-RS ports) for the UE to measure a reference signal (e.g., CSI-RS) for each partial frequency band. Reporting channel information (e.g., CSI) based on each partial frequency band and / or on multiple antenna ports may increase the granularity of the channel information and allow the base station to determine different channel conditions for different partial frequency bands. The base station may configure the UE using the increased granularity of the channel information, thereby improving system efficiency.

[0056] In some cases, the base station may configure multiple partial frequency bands for the UE, and the UE may report channel information for multiple partial frequency bands. The partial bandwidth may be less than the system bandwidth width and greater than the subband (e.g., frequency domain unit, resource block, etc.) width. The base station may additionally or alternatively configure multiple ports for the UE, which may be selected for measuring channel information. The base station may configure the UE by sending a pair of numbers to the UE, and the pair of numbers may indicate the port and subband information for measuring channel information. For example, the first number in the pair of numbers may indicate the number of CSI-RS ports or CSI-RS ports that the UE can select, and the second number in the pair of numbers may indicate the number of partial frequency bands. The UE may select multiple CSI-RS ports for each partial frequency band, calculate the CSI based on the partial frequency band and / or port information, and send the calculated CSI containing the linear combination coefficients of each partial frequency band to the base station.

[0057] The UE may receive a configuration message from a base station, and the configuration message may include an indication of one or more partial frequency bands for CSI reporting. The width of each of the one or more partial frequency bands may be less than the width of the system bandwidth and include multiple frequency domain units (e.g., subbands, resource blocks, etc.). The UE may select one or more antenna ports (e.g., CSI-RS ports) for each partial frequency band based on the configuration message, and receive a reference signal (e.g., CSI-RS) at one or more antenna ports. The UE may calculate CSI, which includes a linear combination of one or more antenna ports selected for each partial frequency band. In some cases, the CSI may be calculated based on receiving a configuration message. The UE may send CSI to the base station, and the CSI may include an indication of the selected antenna port and linear combination coefficient for each of the one or more partial frequency bands.

[0058] Aspects of the present disclosure are initially described in the context of wireless communication systems. Aspects of the present disclosure are also described with respect to additional wireless communication systems, channel state information reporting techniques, and process flows. Aspects of the present disclosure are further described with reference to and further illustrated by apparatus diagrams, system diagrams, and flow charts related to channel state information reporting for partial frequency bands.

[0059] Figure 1An example of a wireless communication system 100 supporting channel state information reporting of a portion of a frequency band according to various aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0060] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be devices of different forms or with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0061] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile or stationary or mobile at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0062] Base stations 105 may communicate with core network 130, or with each other, or both. For example, base stations 105 may interface with core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other via backhaul links 120 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130), or directly and indirectly. In some examples, backhaul links 120 may be or may include one or more wireless links.

[0063] One or more of the base stations 105 described herein may include or may be referred to by one of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0064] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, among other examples. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or may be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, among other examples, and UE 115 may be implemented in various objects such as an appliance or a vehicle, a meter, and among other examples.

[0065] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, such as Figure 1 shown.

[0066] The UE 115 and the base station 105 can communicate wirelessly with each other via one or more communication links 125 through one or more carriers. The term "carrier" may refer to a set of radio spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion (e.g., bandwidth portion (BWP)) of a radio spectrum band operated according to one or more physical layer channels of a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may use carrier aggregation or multi-carrier operation to support communication with the UE 115. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0067] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have control signaling or acquisition signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster for discovery by a UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by a UE 115 via the carrier, or a carrier may operate in a non-standalone mode, where a connection is anchored using a different carrier (e.g., a carrier of the same or different radio access technology).

[0068] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0069] A carrier may be associated with a particular bandwidth of a radio spectrum, and in some examples, a carrier bandwidth may be referred to as a "system bandwidth" of a carrier or wireless communication system 100. For example, a carrier bandwidth may be one of a plurality of bandwidths determined for a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (e.g., a base station 105, a UE 115, or both) may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configurable to support communications on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0070] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may be composed of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further improve the data rate or data integrity of communications with UE 115.

[0071] One or more parameter sets for a carrier may be supported, where the parameter set may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter sets. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications by the UE 115 may be limited to the one or more active BWPs.

[0072] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, which can be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can indicate the maximum subcarrier spacing supported, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames, each radio frame having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0073] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of a cyclic prefix pre-appended to each symbol period). In some wireless communication systems 100, the time slots may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0074] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0075] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a plurality of symbol periods and may be extended across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information of a control information format having a given payload size. A search space set may include a common search space set configured for transmitting control information to a plurality of UEs 115, and a UE-specific search space set for transmitting control information to a specific UE 115.

[0076] Each base station 105 can provide communication coverage via one or more cells, such as macro cells, small cells, hot spots, or other types of cells, or any combination thereof. The term "cell" can refer to a logical communication entity used to communicate with the base station 105 (e.g., via a carrier), and can be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other identifier) ​​used to distinguish adjacent cells. In some examples, a cell can also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors, such as the capabilities of the base station 105, these cells can range from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a cell can be or can include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, as well as other examples.

[0077] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE 115 with a service subscription to a network provider that supports the macro cell. A small cell may be associated with a base station 105 with lower power than a macro cell, and the small cell may operate in a frequency band that is the same or different (e.g., licensed, unlicensed) from the macro cell. A small cell may provide unrestricted access to a UE 115 with a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed user group (CSG), a UE 115 associated with a user in a home or office). A base station 105 may support one or more cells, and may also use one or more component carriers to support communications on one or more cells.

[0078] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0079] In some examples, base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0080] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and in some examples, transmissions from different base stations 105 may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0081] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Application examples of MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0082] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception, but does not support simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not engaged in active communications, operating over a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0083] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 may be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication, and may be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably here.

[0084] In some examples, UE 115 may also be able to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or may not be able to receive transmissions from the base station 105. In some examples, multiple groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates resource scheduling for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0085] In some systems, the D2D communication link 135 can be an example of a communication channel between vehicles (e.g., UE 115), such as a sidelink communication channel. In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as a roadside unit) or with a network, or both, using vehicle-to-network (V2N) communication via one or more network nodes (e.g., base station 105).

[0086] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing or interconnecting packets to an external network. The control plane entity may manage non-access stratum (NAS) functions of UE 115 served by a base station 105 associated with the core network 130, such as mobility, authentication, and bearer management. User IP packets may be delivered through user plane entities, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. The operator IP service 150 may include access to the Internet, (multiple) intranets, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0087] Some network devices, such as base stations 105, may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with the UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs), or merged into a single network device (e.g., base station 105).

[0088] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves can penetrate structures enough for a macro cell to provide service to a UE 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and a shorter range (e.g., less than 100 kilometers) than transmission of smaller frequencies and longer waves using the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0089] The wireless communication system 100 may also operate in a super high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also known as a centimeter band), or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also known as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be employed in transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory agency.

[0090] The wireless communication system 100 can utilize licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio spectrum band, devices such as base stations 105 and UEs 115 can employ carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be based on carrier aggregation configurations and component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, as well as other examples.

[0091] The base station 105 or UE 115 may be equipped with multiple antennas that may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at dispersed geographic locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming of signals sent via the antenna ports.

[0092] The base station 105 or UE 115 can use MIMO communication to exploit multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. This technology can be referred to as spatial multiplexing. For example, multiple signals can be sent by a transmitting device via different antennas or different antenna combinations. Similarly, a receiving device can receive multiple signals via different antennas or different antenna combinations. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are sent to multiple devices.

[0093] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0094] The base station 105 or the UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send signals based on different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device such as the base station 105, or by a receiving device such as the UE 115) to identify the beam direction for later transmission or reception by the base station 105.

[0095] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, a beam direction associated with a transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more of the signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0096] In some examples, transmissions by a device (e.g., a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may generate a combined beam for transmission (e.g., from the base station 105 to the UE 115) using a combination of digital precoding or radio frequency beamforming. The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel codebook, a linear combination codebook, a port selection codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques for sending signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115) or for sending signals in a single direction (e.g., for sending data to a receiving device).

[0097] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from the base station 105, the receiving device (e.g., UE 115) can try multiple reception configurations (e.g., directional listening). For example, the receiving device can try multiple reception directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different reception beamforming weight sets (e.g., different directional listening weight sets) applied to the signals received at multiple antenna elements of the antenna array, or by processing the received signals according to different reception beamforming weight sets applied to the signals received at multiple antenna elements of the antenna array, any of which can be referred to as "listening" according to different reception configurations or reception directions. In some examples, the receiving device can use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). The single reception configuration can be aligned on a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0098] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate through logical channels. The media access control (MAC) layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the core network 130 of the radio bearer that supports user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0099] UE 115 and base station 105 can support retransmission of data to increase the possibility of successfully receiving data. Hybrid automatic repeat request (HARQ) feedback is a technology for increasing the possibility of correctly receiving data through communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC) and retransmission (e.g., automatic repeat request (ARQ)). Under poor radio conditions (e.g., low signal-to-noise ratio conditions), HARQ can improve the throughput at the MAC layer. In some examples, the device can support HARQ feedback for the same time slot, wherein the device can provide HARQ feedback for data received in the previous symbol in the time slot in a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0100] According to some aspects, UE 115 may support reporting CSI on a per-part-band basis. UE 115 may receive a configuration message indicating one or more partial frequency bands and select one or more antenna ports (e.g., CSI-RS ports) for each of the one or more partial frequency bands. UE 115 may receive a reference signal (e.g., CSI-RS) at the selected one or more antenna ports, calculate CSI including a linear combination of the selected one or more antenna ports for each partial frequency band, and send the CSI to base station 105. CSI may include an indication of the selected antenna port and linear combination coefficients for each of the one or more partial frequency bands. Reporting CSI on a per-part-band basis may improve the quality of the CSI and the data transmission rate between UE 115 and base station 105.

[0101] Figure 2 An example of a wireless communication system 200 is shown that supports channel state information reporting for a portion of a frequency band according to aspects of the present disclosure. In some examples, the wireless communication system 200 may implement reference Figure 1 Various aspects of the wireless communication system 100 described herein. The wireless communication system 200 includes a base station 105-a and a UE 115-a. In general, the wireless communication system 200 illustrates an example in which the UE 115-a sends CSI 205 to the base station 105-a, and the CSI 205 may include partial-band CSI 210-a and / or partial-band CSI 210-b.

[0102] In some cases, the base station may send a precoded CSI-RS to the UE over the system bandwidth based on spatial and delay reciprocity, and the UE may send a CSI report to the base station based on receiving the precoded CSI-RS. The mismatch between the uplink and downlink frequency bands may be associated with poor spatial and delay reciprocity and affect the channel information included in the CSI report. For example, the BS may determine a spatial domain reference and a frequency domain reference for precoding of the CSI-RS based on UL channel estimation. If there is poor spatial and delay reciprocity between the uplink and downlink channels, the SD / FD reference determined using the uplink channel is different from the dominant SD / FD reference in the downlink channel. If the UE reports CSI based on CSI-RS precoding, where the SD / FD reference deviates from the dominant SD / FD reference of the downlink channel, the channel information included in the CSI report will have lower quality. The UE 115-a may send CSI 205 to the base station 105-a, and the CSI 205 may include one or more partial frequency band CSI 210. Sending one or more partial frequency band CSI to the base station 105-a can support the base station 105-a to determine different channel conditions for different partial frequency bands, rather than assuming a uniform set of channel conditions for the entire system bandwidth. In some cases, the base station 105-a can determine different data transmission configurations (e.g., MCS) for different portions of the system bandwidth, thereby improving system efficiency and data throughput.

[0103] The UE 115-a may send a sounding reference signal (SRS) to the base station 105-a, and the base station 105-a may send a CSI-RS to the UE 115-a based on receiving the SRS received from the UE 105-a. The UE 115-a may receive the CSI-RS from the base station 105-a, identify one or more partial frequency bands, determine one or more partial frequency bands CSI 210 corresponding to the one or more partial frequency bands, and send the one or more partial frequency bands CSI 210 to the base station 105-a. The width of the partial frequency band may be less than the width of the system bandwidth and greater than the width of the subband (e.g., frequency domain unit). In some cases, the UE 115-a may select a subset of all antenna ports (e.g., CSI-RS ports) for each partial frequency band. The UE 115-a may select the same subset of all antenna ports for different partial frequency bands per layer or across all layers, select different subsets of all antenna ports for different partial frequency bands per layer or across all layers, or any combination thereof. As described above, in some cases, the antenna port may be a CSI-RS port.

[0104] In some cases, the base station 105-a may configure a plurality of CSI-RS ports for the UE 115-a or a plurality of CSI-RS ports that the UE 115-a may select. The base station 105-a may additionally or alternatively configure a plurality of partial frequency bands for the UE 115-a. For example, the base station 105-a may configure the UE 115-a by sending a message including a pair of numbers (e.g., {32 1}, {24, 1}, {16 1}, {16 2}, {12 1}, {12 2}, {12 3}, {8 1}, {8 2}, {8 3}, {8 4}, etc.). One number in the pair (e.g., the first number) may correspond to the number of CSI-RS ports or the number of CSI-RS ports that the UE 115-a is allowed to select (for each layer or across all layers), and the other number in the pair (e.g., the second number) may correspond to the number of partial frequency bands. The configuration may be subject to the capabilities or preferences of UE 115-a. In some examples, UE 115-a may signal partial band capabilities and / or port capabilities to base station 105-a, and base station 105-a may configure UE 115-a based on the signaled capabilities. For example, UE 115-a may signal partial band capability 1 to base station 105-a, and base station 105-a may configure the UE based on the signaled capabilities (e.g., base station 105-a may configure one of {321}, {24, 1}, {16 1}, or {12 1} for UE 115-a). In an additional or alternative example, the UE 115-a may signal the base station 105-a of a port capability of 8, and the base station 105-a may configure the UE based on the signaled capability (e.g., the base station 105-a may configure one of {81}, {82}, {83}, or {84} for the UE 115-a). In an additional or alternative example, the UE 115-a may signal the base station 105-a of a maximum portion of a frequency band capability of 2, and the base station 105-a may configure the UE based on the signaled capability (e.g., the base station 105-a may configure one of {321}, {24, 1}, {161}, {121}, {162}, {122}, {82} for the UE 115-a).

[0105] In some cases, the base station 105-a may configure the UE 115-a with multiple ports or multiple ports that the UE is allowed to select for each layer or across all layers, as well as the size of the partial frequency band. For example, the base station 105-a may configure the UE 115-a by sending a message including a pair of numbers (e.g., {32 1 / 8}, {24 1 / 8}, {16 1 / 8}, {16 1 / 4}, {12 1 / 8}, {12 1 / 4}, {12 1 / 2}, {8 1 / 8}, {8 1 / 4}, {8 1 / 2}, {8 1}, etc.). One of the numbers (e.g., the first number) may correspond to the number of ports or the number of ports that the UE is allowed to select for each layer or across all layers, and the second number may correspond to the number of partial frequency bands per subband (e.g., each subband is less than or equal to 1 partial frequency band) or the ratio between the size of the subband and the size of the partial frequency band. The base station 105-a may configure 115-a based on the capabilities of the UE 115-a. In some examples, the UE 115-a may signal the subband capabilities to the base station 105-a, and the base station 105-a may configure the UE 115-a based on the signaled capabilities. For example, the UE 115-a may signal the base station 105-a a capability of 8 subbands per partial band, and the base station 105-a may configure the UE 115-a based on the signaled capabilities (e.g., the base station 105-a may configure one of {32 1 / 8}, {24, 1 / 8}, {16 1 / 8}, {12 1 / 8}, {8 1 / 8} for the UE 115-a). In an additional or alternative example, UE 115-a may signal to base station 105-a a maximum partial-band capability of a minimum of 4 subbands per partial-band, and base station 105-a may configure the UE based on the signaled capability (e.g., base station 105-a may configure UE 115-a with one of {32 1 / 8}, {24, 1 / 8}, {16 1 / 8}, {12 1 / 8}, {8 1 / 8}, {16 1 / 4}, {12 1 / 4}, {8 1 / 4}).

[0106] The fractional frequency band size (e.g., the number of subbands in the fractional frequency band) can be based on the number of subbands and the number of fractional frequency bands. In some examples, the UE 115-a can be configured with multiple subbands (e.g., 13 subbands), and the base station 105-a can further configure multiple fractional frequency bands (e.g., 2 fractional frequency bands) for the UE 115-a. For example, the first fractional frequency band can have a size of 6 subbands, and the second fractional frequency band can have a size of 7 subbands. In some cases, the UE 115-a can be configured with a large number of ports and a small number of fractional frequency bands. In some additional or alternative cases, the UE 115-a can be configured with a small number of ports and a large number or a small number of fractional frequency bands. Configuring a large number of fractional frequency bands for the UE 115-a can support increasing the granularity and / or quality of the CSI 205, and configuring a small number of fractional frequency bands for the UE 115-a can reduce the payload size of the CSI 205, thereby reducing system resource usage.

[0107] Figure 3 An example of a channel state information reporting technique 300 that supports channel state information reporting of a partial frequency band according to aspects of the present disclosure is illustrated. In some examples, the channel state information reporting technique 300 may be implemented as described in reference Figure 1 Various aspects of the wireless communication system 100 described herein. The portion of the frequency band 305 may include multiple ports and multiple FD units 320 (e.g., subbands, resource blocks, etc.). The UE may report CSI for one or more of the portion of the frequency band 305, which may improve CSI quality and improve system efficiency. The channel state information reporting technique 300 may describe multiple CSI-RS precoders, each corresponding to an FD unit 320 for the portion of the frequency band 305. In some cases, the expression b i is the nTx*1 vector representing the SD benchmark, where nTx is the number of antenna ports at the gNB. is the 1*N3 / 2FD benchmark, where express The nth entry of , and N3 is the number of FD units across all partial frequency bands. The combination of FD reference and SD reference can be different for each port 310. Each partial frequency band 305 can use the same FD / SD pair, different FD / SD pairs, or any combination thereof.

[0108] The UE may report the partial band CSI to the base station, and the partial band CSI may indicate the PMI as a linear combination of the ports. In some cases, the PMI of a certain layer l on the partial band 305 may be expressed as j , where "j" is the index of the partial frequency band 305. For example, the PMI on the partial frequency band 305-a can be expressed as in is the size of P x 1, row i k There is only one "1" in the port i k is selected for layer l and part band j, P is the total number of CSI-RS ports, and is a linear combination coefficient. In some cases, the UE may report CSI for a set of partial frequency bands, and the CSI may indicate the PMI of each partial frequency band 305 in the set of partial frequency bands.

[0109] In some cases, multiple ports may be selected for each portion of frequency band 305. In some examples, the UE may select a set of ports for one or more portion of frequency band 305, and may signal the selected set of ports to the base station (e.g., via a CSI-RS resource indication (CRI)). For example, port 310-a may correspond to port 0 of portion of frequency band 305-a, port 310-b may correspond to port 1 of portion of frequency band 305-a, port 310-c may correspond to port 2 of portion of frequency band 305-a, and port 310-d may correspond to port 3 of portion of frequency band 305-a, port 315-a may correspond to port 0 of portion of frequency band 305-b, port 315-b may correspond to port 1 of portion of frequency band 305-b, port 315-c may correspond to port 2 of portion of frequency band 305-b, and port 315-d may correspond to port 3 of portion of frequency band 305-b. In some cases, the UE may indicate a selected set of ports to the base station, and the selected set of ports may be common to all portion of the frequency band 305 .

[0110] In some cases, CSI-RS on different partial frequency bands are sent in the same CSI-RS resource (i.e., ports 310 and 315 are in the same CSI-RS resource), and the UE can select a port for each partial frequency band from the same CSI-RS resource (if there are multiple resources, the UE can report CRI to indicate the resource). In some cases, CSI-RS on different partial frequency bands are sent in different CSI-RS resources, and the UE can select a port for each partial frequency band from the corresponding CSI-RS resource. Port 310 is in resource 1 and port 315 is in resource 2, then the UE uses resource 1 to select a port for partial frequency band 305-a, and uses resource 2 to select a port for partial frequency band 305-b. In some cases, there are N_PB partial frequency bands and M*N_PB resources. In each resource, CSI-RS is transmitted on a certain partial frequency band, so there are M resources transmitted on certain partial frequency bands, that is, resource 1 to resource M include CSI-RS on partial frequency band 1, resource M+1 to resource 2*M include CSI-RS on partial frequency band 2, ..., resource n*M+1 to resource (n+1)*M include CSI-RS on partial frequency band n+1, ..., resource (N_PB-1)*M+1 to resource N_PB*M include CSI-RS on partial frequency band N_PB. The UE shall report the CRI to indicate that one resource from resource 1 to resource M is used for partial band 1, one resource from resource M+1 to resource 2*M is used for partial band 2, ..., one resource from resource n*M+1 to resource (n+1)*M is used for partial band n+1, ..., one resource from resource (N_PB-1)*M+1 to resource N_PB*M is used for partial band N_PB, and the UE may further report the port selection from the corresponding selected resources for the associated partial band.

[0111] The UE may select ports specific to each portion of the frequency band 305. In some cases, the UE may perform a one-step port selection in which multiple sets of ports specific to the frequency band are selected and reported to the base station. In some examples, the UE may be configured with resources (e.g., a total set of ports common to all portion of the frequency bands 305), and the UE may select a first set of ports (e.g., port 310) applied to each layer or across layers from the resources for the portion of the frequency band 305-a, and select a second set of ports (e.g., port 315) from the same resources for the portion of the frequency band 305-b. In some additional or alternative examples, the UE may be configured with portion-band-specific resources, and the UE may select a set of ports applied to each layer or across layers from the portion-band-specific resources for each portion of the frequency band 305. For example, the UE may select port 310 for the portion of the frequency band 305-a from a set of ports in the resources associated with the portion of the frequency band 305-a, and the UE may select port 315 for the portion of the frequency band 305-b from a set of ports in the resources associated with the portion of the frequency band 305-b.

[0112] UE can perform two-step port selection. In the two-step selection, UE can report the middle group port common to all partial frequency bands 305 (per layer or across layers), and the port set (applied to each layer or across layers) of multiple partial frequency bands selected from the middle group. In some examples, UE can independently report the first group of ports (e.g., port 310) from the middle group port and the second group of ports (e.g., port 315) from the middle group port. The size of the middle group can be configurable. In some cases, UE can be pre-configured with the middle group size, or the base station can indicate the middle group size to the UE. In some cases, the size of the middle group can be derived based on the number of ports selected on each partial frequency band for each layer or across all layers. In some cases, UE can report the size of the middle group (e.g., reporting the size to the base station). In some additional or alternative examples, UE can report a group of ports common to all partial frequency bands 305 and a group of ports associated with a specific partial frequency band 305. The UE may additionally report a sub-band specific set of ports for each sub-band 305 , and may independently select each sub-band specific set of ports from the union of the set of ports common to all sub-bands 305 and the set of ports associated with the specific sub-band 305 .

[0113] In some cases, the UE may be configured (e.g., via an RRC process) with frequency domain restrictions for channel measurements, and the UE may calculate channel state information based on the frequency domain restrictions. For example, the UE may be configured to perform channel measurements in the partial frequency band 305-a and the partial frequency band 305-b, and the UE may calculate channel state information for the partial frequency band 305-a and the partial frequency band 305-b. For partial frequency band CSI reporting, if frequency domain restrictions for channel measurements are configured, the UE will derive channel measurements for calculating the CSI value reported in uplink slot "n" based only on the NZP CSI-RS within each partial frequency band associated with the CSI resource setting.

[0114] In some additional or alternative cases, interference measurement restrictions may be configured for the UE (e.g., via an RRC process), and the UE may measure interference and calculate channel state information based on the interference measurement restrictions. For example, the UE may be configured to perform interference measurements in the portion of frequency band 305-a and the portion of frequency band 305-b, and the UE may measure interference and calculate channel state information for the portion of frequency band 305-a and the portion of frequency band 305-b. For partial-band CSI reporting, if interference measurement restrictions are configured, the UE will derive interference measurements for calculating the CSI value reported in uplink time slot "n" based only on the NZP CSI-RS within each partial frequency band associated with the CSI resource setting.

[0115] Figure 4 An example of a processing flow 400 for supporting channel state information reporting for partial frequency bands in accordance with aspects of the present disclosure is illustrated. In some examples, the processing flow 400 can implement various aspects of the wireless communication system 100. In accordance with aspects of the present disclosure, the UE 115-b and / or the base station 105-b can support partial frequency band CSI (e.g., CSI associated with a partial frequency band). The granularity of the partial frequency band CSI can be finer than the system-wide CSI and can improve the quality of the channel state information reported to the base station. The following alternative examples can be implemented in which some of the steps are performed in a different order than described or not performed at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0116] At 405, UE 115-b may receive a configuration message from base station 105-b, and the configuration message may include an indication of one or more partial frequency bands for CSI reporting. Each of the one or more partial frequency bands may be smaller than the system bandwidth and include a plurality of frequency domain units associated with a precoder.

[0117] At 410, UE 115-b may select one or more antenna ports (e.g., CSI-RS ports) for each of the one or more partial frequency bands based on the configuration message. For example, the configuration message may indicate a set of antenna ports, a plurality of antenna ports, a minimum number of antenna ports, or a maximum number of antenna ports, and UE 115-b may select the one or more antenna ports based on the configuration message.

[0118] At 415, the UE 115-b may receive a reference signal (e.g., CSI-RS) from the base station 105-a. The UE 115-b may measure the received reference signal at the selected one or more antenna ports and generate CSI coefficients for one or more partial frequency bands.

[0119] At 420, UE 115-b may calculate CSI that includes a linear combination of one or more antenna ports selected for each partial frequency band. In some examples, the CSI may include or be based on the generated CSI coefficients. In some cases, at 420, UE 115-b may select one or more antenna ports (e.g., CSI-RS ports) for each partial frequency band. For example, UE 115-b may suppress selecting an antenna port at 410, and UE 115-b may select one or more antenna ports at 420. The CSI may include an indication of a PMI that includes a port selection and a linear combination coefficient. In some cases, the CSI may include a CQI, and the CQI may be calculated based on the PMI.

[0120] At 425, the UE 115-b may send the CSI to the base station 105-b. The CSI may include an indication of the selected antenna ports and linear combination coefficients for each of the one or more partial frequency bands.

[0121] The base station 105-b may send updated transmission parameters to the UE 115-b for further communications with the base station 105-b. The updated transmission parameters may increase the data rate for the UE 115-b and may be based on the received CSI coefficients.

[0122] In some cases, UE 115-b may receive a non-periodic CSI trigger and report CSI to the base station based on receiving the non-periodic CSI trigger. UE 115-b may calculate CSI based on receiving the non-periodic CSI trigger and send it to base station 105-b, and the CSI may include a linear combination of one or more antenna ports for each of a set of one or more partial frequency bands.

[0123] Figure 5A block diagram 500 of a device 505 supporting channel state information reporting for a partial frequency band according to aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a channel state information manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0124] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to channel state information reports for a portion of a frequency band, etc.). The information may be passed to other components of the device 505. The receiver 510 may be a reference Figure 8 Examples of aspects of transceiver 820 are described. Receiver 510 may utilize a single antenna or a group of antennas.

[0125] The channel state information manager 515 may receive a configuration message from a base station including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is less than the system bandwidth and includes a set of frequency domain units associated with a precoder, select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message, calculate channel state information based on receiving the configuration message, the channel state information including a linear combination of the one or more antenna ports selected for each partial frequency band, and send the channel state information including at least an indication of the selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands. The channel state information manager 515 may be an example of aspects of the channel state information manager 810 described herein.

[0126] The channel state information manager 515 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the channel state information manager 515 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0127] The channel state information manager 515 or its subcomponents can be physically located in various locations, including being distributed so that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the channel state information manager 515 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the channel state information manager 515 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0128] Transmitter 520 can transmit signals generated by other components of device 505. In some examples, transmitter 520 can be co-located with receiver 510 in a transceiver module. For example, transmitter 520 can be a reference Figure 8 An example of aspects of the transceiver 820 is described. The transmitter 520 can utilize a single antenna or a group of antennas. The channel state information manager 515 can improve the quality of the CSI reported by the device 505, increase the data rate of the device 505, and improve the link quality between the device 505 and the base station.

[0129] Figure 6 A block diagram 600 of a device 605 supporting channel state information reporting for a partial frequency band according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of a UE 115 or device 505 as described herein. The device 605 may include a receiver 610, a channel state information manager 615, and a transmitter 635. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0130] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to channel state information reports for a portion of a frequency band, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 8 Examples of aspects of transceiver 820 are described. Receiver 610 may utilize a single antenna or a group of antennas.

[0131] The channel state information manager 615 may be an example of aspects of the channel state information manager 515 as described herein. The channel state information manager 615 may include a configuration message processor 620, an antenna port selector 625, and a channel state information generator 630. The channel state information manager 615 may be an example of aspects of the channel state information manager 810 described herein.

[0132] The configuration message processor 620 may receive a configuration message from a base station including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a set of frequency domain units associated with a precoder.

[0133] The antenna port selector 625 may select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message.

[0134] The channel state information generator 630 can calculate channel state information based on the received configuration message, and send the channel state information, which includes at least an indication of the selected antenna port and linear combination coefficient for each partial frequency band in the one or more partial frequency bands.

[0135] Transmitter 635 can transmit signals generated by other components of device 605. In some examples, transmitter 635 can be co-located with receiver 610 in a transceiver module. For example, transmitter 635 can be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 635 may utilize a single antenna or a group of antennas.

[0136] Figure 7 A block diagram 700 of a channel state information manager 705 supporting channel state information reporting for a portion of a frequency band is shown in accordance with aspects of the present disclosure. The channel state information manager 705 may be an example of aspects of the channel state information manager 515, the channel state information manager 615, or the channel state information manager 810 described herein. The channel state information manager 705 may include a configuration message processor 710, an antenna port selector 715, a channel state information generator 720, a capability message generator 725, and a channel resource indication generator 730. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0137] The configuration message processor 710 may receive a configuration message from a base station including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a set of frequency domain units associated with a precoder.

[0138] The antenna port selector 715 may select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message.

[0139] In some examples, selecting one or more antenna ports includes selecting a subset of the total number of antenna ports for each of the one or more partial frequency bands.

[0140] In some examples, antenna port selector 715 may select one or more antenna ports for each portion of the frequency band based on the joint indication.

[0141] In some examples, a report of one or more antenna ports selected for each of one or more partial frequency bands is sent to a base station, wherein the report of the one or more antenna ports selected for each partial frequency band includes an indication of a first group of antenna ports common to all of the one or more partial frequency bands, and, for each of the one or more partial frequency bands, an indication of a second group of antenna ports independently selected for the partial frequency band, wherein the second group of antenna ports for each partial frequency band are from the first group of antenna ports.

[0142] In some examples, antenna port selector 715 may receive a configuration of the size of the first set of antenna ports and the size of the second set of antenna ports from a base station.

[0143] In some cases, the same subset of one or more CSI-RS ports is selected for each of the one or more partial bands.

[0144] In some cases, the antenna ports include channel state information reference signal (CSI-RS) ports, and the configuration message also includes a joint indication of the portion of the frequency band and the number of CSI-RS ports.

[0145] In some cases, the number of partial frequency bands, the partial frequency band size, or the ratio of partial frequency band to frequency unit size; and one or more of: the number of total CSI-RS ports or the number of CSI-RS ports selected for each partial frequency band.

[0146] The channel state information generator 720 may calculate channel state information based on the received configuration message, the channel state information including a linear combination of one or more antenna ports selected for each partial frequency band.

[0147] In some examples, the channel state information generator 720 can send channel state information that includes at least an indication of the selected antenna port and linear combination coefficients for each of the one or more partial frequency bands.

[0148] In some examples, calculating the channel state information includes separately precoding each of the one or more partial frequency bands.

[0149] In some examples, the channel state information generator 720 may receive a configuration of frequency domain restrictions for channel measurement from a base station.

[0150] In some examples, frequency domain limitations on channel measurements are determined to be in place based on a configuration of frequency domain limitations for channel measurements, wherein calculating channel information for each of one or more partial frequency bands includes limiting the channel state measurement to a non-zero power channel state information reference signal within each partial frequency band.

[0151] In some examples, the channel state information generator 720 may receive a configuration of frequency domain limitations for interference measurement from a base station.

[0152] In some examples, frequency domain limitations on interference measurements are determined to be in place based on a configuration of frequency domain limitations for channel measurements, wherein performing interference measurements on each of one or more partial frequency bands includes limiting the interference measurements to zero or non-zero interference measurement resources within each partial frequency band.

[0153] In some cases, the indication of one or more partial frequency bands for channel status reporting includes one or more of: a digital amount of the partial frequency band on which the UE is to perform channel state measurements, the size of the partial frequency band on which the UE is to perform channel state measurements, or a ratio of the partial frequency band size to the frequency domain unit size.

[0154] In some cases, the indication of one or more partial frequency bands depends on a number of total antenna ports or an indication of a number of antenna ports to be selected for each of the one or more partial frequency bands, and the selection of one or more antenna ports for each partial frequency band is based on the indicated number of antenna ports.

[0155] In some cases, a frequency domain unit in the set of frequency domain units corresponds to a subband size used for channel quality indicator (CQI) reporting.

[0156] The capability message generator 725 may send a capability message indicating the digital quality of a portion of the frequency band for which the UE is capable of performing channel measurement to the base station, wherein the configuration message is based on the capability message.

[0157] The channel resource indication generator 730 may send a report of resource selection for channel state measurement of each of the one or more sub-bands to the base station.

[0158] Figure 8A diagram of a system 800 including a device 805 supporting channel state information reporting for a partial frequency band according to various aspects of the present disclosure is shown. The device 805 may be an example of a device 505, 605, or UE 115 described herein or a component thereof. The device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, including a channel state information manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electrical communication via one or more buses (e.g., bus 845).

[0159] The channel state information manager 810 can receive a configuration message from a base station including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder, select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message, calculate channel state information based on receiving the configuration message, the channel state information including a linear combination of the one or more antenna ports selected for each partial frequency band, and send the channel state information, the channel state information including at least an indication of the selected antenna port and the linear combination coefficient for each of the one or more partial frequency bands.

[0160] I / O controller 815 can manage input and output signals for device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize an operating system, such as iOS. ANDROID , MS-DOS 、MS-WINDOWS , OS / 2 ,UNIX 、LINUX Or other known operating systems. In other cases, I / O controller 815 can represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 can be implemented as a part of a processor. In some cases, a user can interact with device 805 via I / O controller 815 or via hardware components controlled by I / O controller 815.

[0161] The transceiver 820 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 820 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 820 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate the packets received from the antenna.

[0162] In some cases, a wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of concurrently sending or receiving multiple wireless transmissions.

[0163] The memory 830 may include RAM and ROM. The memory 830 may store computer-readable, computer-executable code 835, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 830 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0164] The processor 840 may include a programmable hardware device, (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks to support channel state information reporting for a portion of the frequency band).

[0165] The code 835 may include instructions to implement various aspects of the present disclosure, including instructions to support wireless communications. The code 835 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 835 may not be directly executable by the processor 840 but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. The channel state information manager 810 may increase the granularity of the CSI reported by the device 805. The increased CSI granularity may enhance the quality of the CSI and improve the efficiency of the device 805.

[0166] Fig. 9A block diagram 900 of a device 905 supporting channel state information reporting for a partial frequency band according to aspects of the present disclosure is shown. The device 905 may be an example of aspects of a base station 105 as described herein. The device 905 may include a receiver 910, a channel state information manager 915, and a transmitter 920. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0167] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to channel state information reports for a portion of a frequency band, etc.). The information may be passed to other components of the device 905. The receiver 910 may refer to Fig.12 Examples of aspects of the transceiver 1220 are described. The receiver 910 may utilize a single antenna or a group of antennas.

[0168] The channel state information manager 915 may send a configuration message including an indication of one or more partial frequency bands for channel state information reporting to the UE, wherein each of the one or more partial frequency bands is less than the system bandwidth and includes a set of frequency domain units associated with a precoder, based on sending the configuration message and the channel state measurement, receive channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands, and based on receiving the channel state information for each of the one or more partial frequency bands, communicate with the UE. The channel state information manager 915 may be an example of aspects of the channel state information manager 1210 described herein.

[0169] The channel state information manager 915 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the channel state information manager 915 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0170] The channel state information manager 915 or its subcomponents can be physically located in various locations, including being distributed so that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the channel state information manager 915 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the channel state information manager 915 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0171] Transmitter 920 can transmit signals generated by other components of device 905. In some examples, transmitter 920 can be co-located with receiver 910 in a transceiver module. For example, transmitter 920 can be a reference Fig.12 An example of aspects of the transceiver 1220 is described. The transmitter 920 can utilize a single antenna or a group of antennas. The channel state information manager 915 can improve the quality of the CSI reported by the device 905, increase the data rate of the device 905, and improve the link quality between the device 905 and the base station.

[0172] Fig.10 A block diagram 1000 of a device 1005 supporting channel state information reporting for a partial frequency band according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or base station 105 as described herein. The device 1005 may include a receiver 1010, a channel state information manager 1015, and a transmitter 1035. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0173] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to channel state information reports for a portion of a frequency band, etc.). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The receiver 1010 may utilize a single antenna or a group of antennas.

[0174] The channel state information manager 1015 may be an example of aspects of the channel state information manager 915 as described herein. The channel state information manager 1015 may include a configuration message manager 1020, an antenna port manager 1025, and a communication manager 1030. The channel state information manager 1015 may be an example of aspects of the channel state information manager 1210 as described herein.

[0175] The configuration message manager 1020 may send a configuration message to the UE including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder.

[0176] The antenna port manager 1025 may receive channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial bands based on sending the configuration message and the channel state measurement.

[0177] The communication manager 1030 may communicate with the UE based on receiving the channel state information of each of the one or more partial frequency bands.

[0178] Transmitter 1035 can transmit signals generated by other components of device 1005. In some examples, transmitter 1035 can be co-located with receiver 1010 in a transceiver module. For example, transmitter 1035 can be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The transmitter 1035 may utilize a single antenna or a group of antennas.

[0179] Fig.11 A block diagram 1100 of a channel state information manager 1105 supporting channel state information reporting for a portion of a frequency band is shown in accordance with aspects of the present disclosure. The channel state information manager 1105 may be an example of aspects of the channel state information manager 915, the channel state information manager 1015, or the channel state information manager 1210 described herein. The channel state information manager 1105 may include a configuration message manager 1110, an antenna port manager 1115, a communication manager 1120, a capability message manager 1125, and a resource selection manager 1130. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0180] The configuration message manager 1110 may send a configuration message to the UE including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder.

[0181] In some examples, the configuration message manager 1110 may send a configuration of frequency domain restrictions for channel measurement to the UE.

[0182] In some examples, the configuration message manager 1110 may receive channel state information based on channel measurements of a non-zero power channel state information reference signal within each sub-band.

[0183] In some examples, the configuration message manager 1110 may send a configuration of frequency domain limitations for interference measurements to the UE.

[0184] In some examples, the configuration message manager 1110 may receive channel state information for interference measurement based on interference measurement resources within each partial frequency band.

[0185] In some cases, the indication of one or more partial frequency bands for channel status reporting includes one or more of: a digital amount of the partial frequency band on which the UE is to perform channel state measurements, the size of the partial frequency band on which the UE is to perform channel state measurements, or a ratio of the partial frequency band size to the frequency domain unit size.

[0186] In some cases, the indication of one or more partial frequency bands depends on a number of total antenna ports or an indication of a number of antenna ports to be selected for each of the one or more partial frequency bands, and the selection of one or more antenna ports for each partial frequency band is based on the indicated number of antenna ports.

[0187] The antenna port manager 1115 may receive channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands based on sending the configuration message and the channel state measurement.

[0188] In some examples, a report of one or more antenna ports selected for each of one or more partial frequency bands is received from a UE, wherein the report of the one or more antenna ports selected for each partial frequency band includes an indication of a first group of antenna ports common to all of the one or more partial frequency bands, and, for each of the one or more partial frequency bands, an indication of a second group of antenna ports independently selected for the partial frequency band, wherein the second group of antenna ports for each partial frequency band is from the first group of antenna ports.

[0189] In some examples, antenna port manager 1115 may send a configuration of the size of the first set of antenna ports and the size of the second set of antenna ports to the UE.

[0190] In some cases, the antenna ports include channel state information reference signal (CSI-RS) ports, and the configuration message also includes a joint indication of the portion of the frequency band and the number of CSI-RS ports.

[0191] In some cases, one or more antenna ports for each sub-band are selected based on the joint indication.

[0192] In some cases, the number of partial bands, the partial band size, or the ratio of partial band to frequency unit size; and one or more of: the number of total CSI-RS ports or the number of CSI-RS ports to be selected for each partial band.

[0193] The communication manager 1120 may communicate with the UE based on receiving the channel state information of each of the one or more partial frequency bands.

[0194] The capability message manager 1125 may receive a capability message from the UE indicating digital quality of a portion of the frequency band for which the UE is capable of performing channel measurement, wherein the configuration message is based on the capability message.

[0195] The resource selection manager 1130 may receive a report of resource selection for channel state measurement for each of the one or more partial frequency bands from the UE.

[0196] Fig.12 A diagram of a system 1200 including a device 1205 supporting channel state information reporting for a portion of a frequency band according to aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a base station 105 described herein or include components thereof. The device 1205 may include components for two-way voice and data communications, including components for sending and receiving communications, including a channel state information manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electrical communication via one or more buses (e.g., bus 1250).

[0197] The channel state information manager 1210 may send a configuration message to a UE including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder, receive channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands based on sending the configuration message and the channel state measurement, and communicate with the UE based on receiving the channel state information for each of the one or more partial frequency bands.

[0198] The network communications manager 1215 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0199] The transceiver 1220 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1220 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1220 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate packets received from the antenna.

[0200] In some cases, a wireless device may include a single antenna 1225. However, in some cases, the device may have more than one antenna 1225, which may be capable of concurrently sending or receiving multiple wireless transmissions.

[0201] Memory 1230 may include RAM, ROM, or a combination thereof. Memory 1230 may store computer readable code 1235, which includes instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, memory 1230 may contain, among other things, BIOS, which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0202] Processor 1240 may include an intelligent hardware device, (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., functions or tasks to support channel state information reporting for a portion of a frequency band).

[0203] The inter-site communication manager 1245 can manage communications with other base stations 105 and can include a controller or scheduler for cooperating with other base stations 105 to control communications with UE 115. For example, the inter-site communication manager 1245 can coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 can provide an X2 interface in LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0204] The code 1235 may include instructions to implement various aspects of the present disclosure, including instructions to support wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executable by the processor 1240, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. The channel state information manager 1210 may increase the granularity of the CSI reported by the device 1205. The increased CSI granularity may enhance the quality of the CSI and improve the efficiency of the device 1205.

[0205] Fig.13 A flow chart illustrating a method 1300 for supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is shown. The operations of the method 1300 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1300 may be implemented by referring to Figures 5 to 8 The channel state information manager described herein is used to perform. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0206] At 1305, the UE may receive a configuration message from a base station, the configuration message including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be described with reference to Figures 5 to 8 The configured message processor is executed.

[0207] At 1310, the UE may select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be described with reference to Figures 5 to 8 The antenna port selector is used to perform the above operation.

[0208] At 1315, the UE may calculate channel state information based on the received configuration message, the channel state information comprising a linear combination of one or more antenna ports selected for each partial frequency band. The operation of 1315 may be performed according to the method described herein. In some examples, aspects of the operation of 1315 may be described with reference to Figures 5 to 8 The channel state information generator is used to perform the above operation.

[0209] At 1320, the UE may send channel state information including at least an indication of a selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be described with reference to Figures 5 to 8 The channel state information generator is used to perform the above operation.

[0210] Fig.14 A flow chart illustrating a method 1400 for supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 The channel state information manager described herein is used to perform. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0211] At 1405, the UE may receive a configuration message from a base station, the configuration message including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be described with reference to Figures 5 to 8 The configured message processor is executed.

[0212] At 1410, the UE may select one or more antenna ports for each of the one or more partial frequency bands based on the configuration message. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be described with reference to Figures 5 to 8 The antenna port selector is used to perform the above operation.

[0213] At 1415, the UE may calculate channel state information based on the received configuration message, the channel state information comprising a linear combination of one or more antenna ports selected for each partial frequency band. The operation of 1415 may be performed according to the method described herein. In some examples, aspects of the operation of 1415 may be described with reference to Figures 5 to 8 The channel state information generator is used to perform the above operation.

[0214] At 1420, the UE may send channel state information including at least an indication of a selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be described with reference to Figures 5 to 8 The channel state information generator is used to perform the above operation.

[0215] At 1425, the UE may include the indication of one or more partial frequency bands for channel state reporting in one or more of the following: a digital amount of the partial frequency band for which the UE is to perform channel state measurement, or a size of the partial frequency band for which the UE is to perform channel state measurement, or a ratio of the size of the partial frequency band to the size of the frequency domain unit. The operation of 1425 may be performed according to the methods described herein. In some examples, aspects of the operation of 1425 may be described with reference to Figures 5 to 8 The channel state information generator is used to perform the above operation.

[0216] At 1430, the UE may send a capability message to the base station indicating the digital quality of the portion of the frequency band for which the UE is capable of performing channel measurement, wherein the configuration message is based on the capability message. The operations of 1430 may be performed according to the methods described herein. In some examples, aspects of the operations of 1430 may be described with reference to Figures 5 to 8 The capability message generator is executed.

[0217] Fig.15 A flow chart illustrating a method 1500 for supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by reference to Figures 9 to 12 The channel state information manager described above is used to perform. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0218] At 1505, the base station may send a configuration message to the UE including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be described with reference to Figures 9 to 12 The configuration message manager is executed.

[0219] At 1510, the base station may receive channel state information based on sending the configuration message and the channel state measurement, the channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be described with reference to Figures 9 to 12 The antenna port manager is used to perform the above operations.

[0220] At 1515, the base station may communicate with the UE based on the received channel state information for each of the one or more partial frequency bands. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be described with reference to Figures 9 to 12 The communication manager is executed.

[0221] Fig.16 A flow chart illustrating a method 1600 for supporting channel state information reporting of a partial frequency band according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by reference to Figures 9 to 12 The channel state information manager described above is used to perform. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0222] At 1605, the base station may send a configuration message including an indication of one or more partial frequency bands for channel state information reporting to the UE, wherein each of the one or more partial frequency bands is smaller than the system bandwidth and includes a set of frequency domain units associated with a precoder. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be described with reference to Figures 9 to 12 The configuration message manager is executed.

[0223] At 1610, the base station may receive channel state information based on sending the configuration message and the channel state measurement, the channel state information including an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be described with reference to Figures 9 to 12 The antenna port manager is used to perform the above operations.

[0224] At 1615, the base station may communicate with the UE based on the received channel state information for each of the one or more partial frequency bands. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be described with reference to Figures 9 to 12 The communication manager is executed.

[0225] At 1620, the base station may receive a capability message from the UE indicating the digital quality of the portion of the frequency band for which the UE is capable of performing channel measurement, wherein the configuration message is based on the capability message. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be described with reference to Figures 9 to 12 The capability message manager is used to perform the above operations.

[0226] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or modified, and other implementations are possible. Furthermore, aspects of two or more methods may be combined.

[0227] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0228] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the specification may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0229] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0230] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0231] Computer-readable media include both non-transitory computer storage media and communication media, including any medium that facilitates the transfer of computer programs from one place to another.Non-transitory storage media can be any available medium that can be accessed by a general or special computer.By way of example and not limitation, non-transitory computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage device, disk storage device or other magnetic storage device, or can be used to carry or store desired program code devices in the form of instructions or data structures and can be accessed by general or special computers or general or special processors.Again, any connection is properly referred to as computer-readable media.For example, if software is sent from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwave, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of computer-readable media. Disc and disk, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where discs usually reproduce data magnetically, while disks reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0232] As used herein, including in the claims, "or" used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0233] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes the similar components. If only the first reference label is used in the specification, the description applies to any one similar component having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0234] The description set forth herein, in conjunction with the accompanying drawings, describes example configurations and does not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these technologies may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0235] The description here is provided to enable those of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment UE, comprising: receiving a configuration message from a base station, the configuration message including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a plurality of frequency domain units associated with a precoder; selecting one or more antenna ports for each of the one or more partial frequency bands based at least in part on the configuration message; Based at least in part on receiving the configuration message, calculating channel state information, the channel state information comprising a linear combination of one or more antenna ports selected for each partial frequency band, wherein calculating the channel state information comprises separately precoding each of the one or more partial frequency bands; and The channel state information is transmitted, the channel state information comprising at least an indication of a selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

2. The method according to claim 1, wherein: The antenna port includes a channel state information reference signal CSI-RS port, and Selecting the one or more antenna ports includes selecting a subset of the total number of antenna ports for each of the one or more partial frequency bands.

3. The method according to claim 2, wherein: A same subset of one or more CSI-RS ports is selected for each of the one or more partial frequency bands.

4. The method according to claim 1, wherein: The indication of one or more partial frequency bands for channel status reporting includes one or more of the following: the digital amount of the partial frequency band on which the UE is to perform channel status measurement, or the size of the partial frequency band on which the UE is to perform channel status measurement, or the ratio of the partial frequency band size to the frequency domain unit size.

5. The method according to claim 4, further comprising: A capability message is sent to the base station, the capability message indicating a digital quality of a portion of a frequency band for which the UE is capable of performing channel measurement, wherein the configuration message is based at least in part on the capability message.

6. The method according to claim 4, wherein: The indication of one or more partial frequency bands depends on an indication of a number of total antenna ports or a number of antenna ports to be selected for each of the one or more partial frequency bands, and the selection of the one or more antenna ports for each partial frequency band is based on the indicated number of antenna ports.

7. The method according to claim 1, wherein: The antenna port includes a channel state information reference signal CSI-RS port, and the configuration message also includes a joint indication of a digital quantity of the partial frequency band and the CSI-RS port; as well as Selecting the one or more antenna ports for each partial frequency band is based on the joint indication.

8. The method according to claim 7, wherein: The joint indication includes one or more of the following: the number of partial frequency bands, the size of the partial frequency bands, or the ratio of the partial frequency bands to the frequency unit size; and one or more of the following: the number of total CSI-RS ports or the number of CSI-RS ports to be selected for each partial frequency band.

9. The method according to claim 1, further comprising: A report of one or more antenna ports selected for each of the one or more partial frequency bands is sent to the base station, wherein the report of the one or more antenna ports selected for each partial frequency band includes an indication of a first group of antenna ports common to all of the one or more partial frequency bands, and an indication of a second group of antenna ports independently selected for each of the one or more partial frequency bands, wherein the second group of antenna ports used for each partial frequency band is from the first group of antenna ports.

10. The method according to claim 1, further comprising: A configuration of a size of a first group of antenna ports and a size of a second group of antenna ports is received from the base station.

11. The method according to claim 1, further comprising: A report of resource selection for channel state measurement of each of the one or more partial frequency bands is sent to the base station.

12. The method according to claim 1, further comprising: receiving, from the base station, a configuration of frequency domain restrictions for channel measurement; as well as Determining whether frequency domain limitations on channel measurements are in place is based at least in part on the configuration of frequency domain limitations for channel measurements, wherein calculating the channel state information for each of the one or more partial frequency bands includes limiting the channel state measurement to a non-zero power channel state information reference signal within each partial frequency band.

13. The method according to claim 1, further comprising: receiving, from the base station, a configuration of frequency domain limitations for interference measurement; as well as Frequency domain limitations for interference measurements are determined to be in place based at least in part on the configuration of frequency domain limitations for channel measurements, wherein performing interference measurements on each of the one or more partial frequency bands includes limiting the interference measurements to zero or non-zero interference measurement resources within each partial frequency band.

14. The method according to claim 1, wherein: A frequency domain unit of the plurality of frequency domain units corresponds to a subband size for a channel quality indicator (CQI) report.

15. A method for wireless communication at a base station, comprising: Sending a configuration message to a user equipment UE, the configuration message comprising an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; receiving channel state information based at least in part on sending the configuration message and the channel state measurement, the channel state information comprising an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands, wherein the channel state information is calculated by separately precoding each of the one or more partial frequency bands; and Based at least in part on receiving the channel state information for each of the one or more partial frequency bands, communicating with the UE.

16. The method according to claim 15, wherein: The indication of one or more partial frequency bands for channel status reporting includes one or more of the following: the digital amount of the partial frequency band on which the UE is to perform channel status measurement, or the size of the partial frequency band on which the UE is to perform channel status measurement, or the ratio of the partial frequency band size to the frequency domain unit size.

17. The method according to claim 16, wherein: The indication of one or more partial frequency bands depends on an indication of a number of total antenna ports or a number of antenna ports to be selected for each of the one or more partial frequency bands, and the selection of the one or more antenna ports for each partial frequency band is based on the indicated number of antenna ports.

18. The method according to claim 15, further comprising: A capability message is received from the UE, the capability message indicating a digital quality of a portion of a frequency band for which the UE is capable of performing channel measurements, wherein the configuration message is based at least in part on the capability message.

19. The method of claim 15, wherein: The antenna port includes a channel state information reference signal CSI-RS port, and the configuration message also includes a joint indication of a digital quantity of a partial frequency band and the CSI-RS port; as well as The one or more antenna ports for each frequency sub-band are selected based at least in part on the joint indication.

20. The method according to claim 19, wherein: The joint indication includes one or more of the following: the number of partial frequency bands, the size of the partial frequency bands, or the ratio of the partial frequency bands to the frequency unit size; and one or more of the following: the number of total CSI-RS ports or the number of CSI-RS ports to be selected for each partial frequency band.

21. The method of claim 15, further comprising: A report of one or more antenna ports selected for each of the one or more partial frequency bands is received from the UE, wherein the report of the one or more antenna ports selected for each partial frequency band includes an indication of a first group of antenna ports common to all of the one or more partial frequency bands, and an indication of a second group of antenna ports independently selected for each of the one or more partial frequency bands, wherein the second group of antenna ports for each partial frequency band is from the first group of antenna ports.

22. The method of claim 15, further comprising: The configuration of the size of the first group of antenna ports and the size of the second group of antenna ports is sent to the UE.

23. The method of claim 15, further comprising: A report of resource selection for the channel state measurement for each of the one or more partial frequency bands is received from the UE.

24. The method of claim 15, further comprising: Sending a configuration of frequency domain restriction for channel measurement to the UE; as well as The channel state information based on channel measurement of a non-zero power channel state information reference signal within each sub-band is received.

25. The method of claim 15, further comprising: Sending a configuration of frequency domain limitation for interference measurement to the UE; as well as The channel state information based on interference measurement of interference measurement resources within each sub-band is received.

26. An apparatus for wireless communication at a user equipment UE, comprising: processor, a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to: receiving a configuration message from a base station, the configuration message including an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and includes a plurality of frequency domain units associated with a precoder; selecting one or more antenna ports for each of the one or more partial frequency bands based at least in part on the configuration message; Based at least in part on receiving the configuration message, calculating channel state information, the channel state information comprising a linear combination of one or more antenna ports selected for each partial frequency band, wherein calculating the channel state information comprises separately precoding each of the one or more partial frequency bands; and The channel state information is transmitted, the channel state information comprising at least an indication of a selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

27. The device according to claim 26, wherein: The instructions for selecting the one or more antenna ports are executable by the processor to cause the apparatus to select a subset of the total number of antenna ports for each of the one or more partial frequency bands.

28. The device according to claim 27, wherein A same subset of one or more CSI-RS ports is selected for each of the one or more partial frequency bands.

29. An apparatus for wireless communication at a base station, comprising: processor, a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to: Sending a configuration message to a user equipment UE, the configuration message comprising an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; receiving channel state information based at least in part on sending the configuration message and the channel state measurement, the channel state information comprising an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands, wherein the channel state information is calculated by separately precoding each of the one or more partial frequency bands; and Based at least in part on receiving the channel state information for each of the one or more partial frequency bands, communicating with the UE.

30. The device according to claim 29, wherein: The indication of one or more partial frequency bands for channel status reporting includes one or more of the following: the digital amount of the partial frequency band on which the UE is to perform channel status measurement, or the size of the partial frequency band on which the UE is to perform channel status measurement, or the ratio of the partial frequency band size to the frequency domain unit size.

31. The device according to claim 30, wherein The indication of one or more partial frequency bands depends on an indication of a number of total antenna ports or a number of antenna ports to be selected for each of the one or more partial frequency bands, and the selection of the one or more antenna ports for each partial frequency band is based on the indicated number of antenna ports.

32. An apparatus for wireless communication at a user equipment UE, comprising: means for receiving a configuration message from a base station, the configuration message comprising an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; means for selecting one or more antenna ports for each of the one or more partial frequency bands based at least in part on the configuration message; means for calculating channel state information based at least in part on receiving the configuration message, the channel state information comprising a linear combination of one or more antenna ports selected for each partial frequency band, wherein calculating the channel state information comprises separately precoding each of the one or more partial frequency bands; and Means for transmitting channel state information, the channel state information comprising at least an indication of a selected antenna port and linear combination coefficients for each of the one or more partial frequency bands.

33. The device according to claim 32, wherein: The means for selecting the one or more antenna ports includes means for selecting a subset of the total number of antenna ports for each of the one or more partial frequency bands.

34. An apparatus for wireless communication at a base station, comprising: means for sending a configuration message to a user equipment UE, the configuration message comprising an indication of one or more partial frequency bands for channel state information reporting, wherein each of the one or more partial frequency bands is smaller than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; means for receiving channel state information based at least in part on sending the configuration message and the channel state measurement, the channel state information comprising an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands, wherein the channel state information is calculated by separately precoding each of the one or more partial frequency bands; and Means for communicating with the UE based at least in part on receiving the channel state information for each of the one or more partial frequency bands.

35. A non-transitory computer-readable medium storing a code for wireless communication at a user equipment (UE), the code comprising instructions for a processor to perform the following operations: receiving a configuration message from a base station, the configuration message including an indication of one or more partial frequency bands for channel state information reporting, wherein: Each of the one or more partial frequency bands is smaller than a system bandwidth and includes a plurality of frequency domain cells associated with a precoder; selecting one or more antenna ports for each of the one or more partial frequency bands based at least in part on the configuration message; Based at least in part on receiving the configuration message, calculating channel state information, the channel state information comprising a linear combination of one or more antenna ports selected for each partial frequency band, wherein calculating the channel state information comprises separately precoding each of the one or more partial frequency bands; as well as The channel state information is transmitted, the channel state information comprising at least an indication of a selected antenna port and a linear combination coefficient for each of the one or more partial frequency bands.

36. A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions for a processor to: Sending a configuration message to a user equipment UE, the configuration message including an indication of one or more partial frequency bands for channel state information reporting, wherein: Each of the one or more partial frequency bands is smaller than a system bandwidth and includes a plurality of frequency domain cells associated with a precoder; receiving channel state information based at least in part on sending the configuration message and the channel state measurement, the channel state information comprising an indication of antenna ports and linear combination coefficients for each of the one or more partial frequency bands, wherein the channel state information is calculated by separately precoding each of the one or more partial frequency bands; as well as Based at least in part on receiving the channel state information for each of the one or more partial frequency bands, communicating with the UE.

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