WO2020168923A1 - Schéma pour associer un signal de référence à un canal de commande de liaison montante - Google Patents

Schéma pour associer un signal de référence à un canal de commande de liaison montante Download PDF

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Publication number
WO2020168923A1
WO2020168923A1 PCT/CN2020/074430 CN2020074430W WO2020168923A1 WO 2020168923 A1 WO2020168923 A1 WO 2020168923A1 CN 2020074430 W CN2020074430 W CN 2020074430W WO 2020168923 A1 WO2020168923 A1 WO 2020168923A1
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WIPO (PCT)
Prior art keywords
reference signal
resource
control channel
message
uplink control
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PCT/CN2020/074430
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English (en)
Inventor
Qiaoyu Li
Chao Wei
Yu Zhang
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Qualcomm Incorporated
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Publication of WO2020168923A1 publication Critical patent/WO2020168923A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection

Definitions

  • the following relates generally to wireless communications, and more specifically to associating a reference signal with an uplink control channel.
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the 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, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • a wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • a base station and a UE may communicate using beamformed transmissions, where transmissions may have a spatial or directional component that improves signal strength and communication quality.
  • a transmitting device may calculate a spatial precoder, apply the spatial precoder to a set of information, and transmit the precoded information in a message based on the calculated precoder.
  • the described techniques relate to improved methods, systems, devices, and apparatuses that support associating a reference signal with an uplink control channel.
  • the described techniques provide for associating an uplink control channel resource used for transmitting an uplink message with a reference signal resource used for calculating a spatial precoder for the uplink message.
  • a base station may associate the uplink control channel resource and the reference signal resource and signal an indicator of the association to a user equipment (UE) .
  • the UE may use the association to receive the reference signal on the reference signal resource.
  • the UE may use the reference signal to calculate the precoder for the uplink message, may generate the uplink message using the precoder, and may transmit the uplink message to the base station on the uplink control channel resource.
  • Various methods are described for associating the uplink control channel resource and the reference signal resource.
  • the base station may transmit a radio resource control (RRC) message to the UE indicating an association between the uplink control channel resource and the reference signal resource.
  • RRC radio resource control
  • the RRC message may also indicate an uplink control channel resource or a reference signal resource scheduled for the UE. The UE may then use either of the scheduled uplink control channel resource or the reference signal resource, and the association, to determine the other resource.
  • the base station may transmit downlink control information (DCI) to the UE indicating an association between the uplink control channel resource and the reference signal resource.
  • DCI downlink control information
  • the base station may trigger or configure channel state information (CSI) feedback to be included in the uplink message, where the triggering may be initiated via a downlink message (e.g., an RRC message or DCI) which may indicate a reference signal for the CSI feedback and may indicate the uplink control channel resource for transmitting the CSI feedback.
  • a downlink message e.g., an RRC message or DCI
  • the downlink message may indicate that the reference signal for CSI should be used for calculating the precoder for the uplink message, while, in other cases, the downlink message may indicate that the reference signal for calculating the precoder may be different than the reference signal used for CSI.
  • the base station may schedule a downlink channel and acknowledgement/negative acknowledgement (ACK/NACK) feedback via a DCI message, where the DCI message may indicate the uplink control channel resource for transmitting the ACK/NACK feedback (e.g., via the uplink message) and may indicate the reference signal resource to be used for calculating the precoder for the uplink message.
  • ACK/NACK acknowledgement/negative acknowledgement
  • a method of wireless communication at a UE is described.
  • the method may include identifying an association between a reference signal resource and an uplink control channel resource, receiving a first reference signal within the reference signal resource, calculating a spatial precoder based on the first reference signal, precoding information based on the spatial precoder, and transmitting, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to identify an association between a reference signal resource and an uplink control channel resource, receive a first reference signal within the reference signal resource, calculate a spatial precoder based on the first reference signal, precode information based on the spatial precoder, and transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • 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 identify an association between a reference signal resource and an uplink control channel resource, receive a first reference signal within the reference signal resource, calculate a spatial precoder based on the first reference signal, precode information based on the spatial precoder, and transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • identifying the association may include operations, features, means, or instructions for receiving a downlink message that configures the UE with the uplink control channel resource and indicates that an identifier (ID) of the reference signal resource may be associated with an ID of the uplink control channel resource.
  • ID identifier
  • identifying the association may include operations, features, means, or instructions for receiving a downlink message that triggers the UE to provide CSI feedback in the uplink message for a second reference signal using the uplink control channel resource and indicates an ID of the first reference signal, where the first reference signal may be different than the second reference signal, and identifying that the reference signal resource may be associated with the uplink control channel resource based on the downlink message.
  • the second reference signal may be a periodic reference signal.
  • identifying the association may include operations, features, means, or instructions for receiving a downlink message that triggers the UE to provide CSI feedback in the uplink message for the first reference signal using the uplink control channel resource, where the first reference signal may be a periodic reference signal, and identifying that the reference signal resource may be associated with the uplink control channel resource based on the downlink message.
  • identifying the association may include operations, features, means, or instructions for receiving a downlink message that schedules a downlink data channel and the uplink control channel resource for the UE to provide acknowledgement feedback for the downlink data channel within the uplink message and indicates the reference signal resource, and identifying that the reference signal resource may be associated with the uplink control channel resource based on the downlink message.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a slot offset and a QCL relationship for the second reference signal based on the downlink message, and monitoring for the first reference signal within the reference signal resource based on the slot offset and the QCL relationship for the second reference signal.
  • the downlink message may be DCI.
  • the association may be identified based least in part on the reference signal resource being a most recently configured or triggered reference signal resource.
  • the association may be identified based least in part on the reference signal resource being stored in memory.
  • the first reference signal may be a periodic reference signal, an aperiodic reference signal, or a CSI reference signal (CSI-RS) .
  • CSI-RS CSI reference signal
  • the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to identify an association between a reference signal resource and an uplink control channel resource, transmit, to a UE, a first reference signal within the reference signal resource, and monitor the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • the apparatus may include means for identifying an association between a reference signal resource and an uplink control channel resource, transmitting, to a UE, a first reference signal within the reference signal resource, and monitoring the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • 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 identify an association between a reference signal resource and an uplink control channel resource, transmit, to a UE, a first reference signal within the reference signal resource, and monitor the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • identifying the association may include operations, features, means, or instructions for transmitting a downlink message that configures the UE with the uplink control channel resource and indicates that an ID of the reference signal resource may be associated with an ID of the uplink control channel resource.
  • identifying the association may include operations, features, means, or instructions for transmitting a downlink message that triggers or configures the first reference signal and indicates that a reference signal ID for the first reference signal may be associated with an ID for the uplink control channel resource.
  • identifying the association may include operations, features, means, or instructions for transmitting a downlink message that triggers the UE to provide CSI feedback in the uplink message for a second reference signal using the uplink control channel resource and indicates an ID of the first reference signal, where the first reference signal may be different than the second reference signal.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a slot offset and a QCL relationship for the second reference signal, where the first reference signal may be transmitted within the reference signal resource based on the slot offset and the QCL relationship for the second reference signal.
  • the second reference signal may be a periodic reference signal.
  • identifying the association may include operations, features, means, or instructions for transmitting a downlink message that triggers the UE to provide CSI feedback in the uplink message for the first reference signal using the uplink control channel resource, where the first reference signal may be a periodic reference signal.
  • the downlink message may be an RRC message.
  • identifying the association may include operations, features, means, or instructions for transmitting a downlink message that schedules a downlink data channel and the uplink control channel resource for the UE to provide acknowledgement feedback for the downlink data channel within the uplink message and indicates the reference signal resource.
  • identifying the association may include operations, features, means, or instructions for transmitting a downlink message that triggers the UE to provide CSI feedback within the uplink message for a second reference signal using the uplink control channel resource and indicates the reference signal resource, where the second reference signal may be different than the first reference signal.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a slot offset and a QCL relationship for the second reference signal, where the first reference signal may be transmitted within the reference signal resource based on the slot offset and the QCL relationship for the second reference signal.
  • identifying the association may include operations, features, means, or instructions for transmitting a downlink message that triggers the UE to provide CSI feedback for the reference signal resource within the uplink message using the uplink control channel resource.
  • the downlink message may be DCI.
  • the association may be identified based least in part on the reference signal resource being a most recently configured or triggered reference signal resource.
  • the association may be identified based least in part on the reference signal resource being stored in memory.
  • the first reference signal may be a periodic reference signal, an aperiodic reference signal, or a CSI-RS.
  • FIG. 1 illustrates an example of a wireless communications system that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates an example of a wireless communications system that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • FIG. 5 illustrates an example of a process flow that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • FIG. 6 illustrates an example of a process flow that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • FIG. 10 shows a diagram of a system including a device that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • FIGs. 11 and 12 show block diagrams of devices that support associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • FIG. 13 shows a block diagram of a communications manager that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • FIG. 14 shows a diagram of a system including a device that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the techniques described herein may include schemes for associating an uplink control channel resource and a reference signal resource.
  • a base station may configure an association between the uplink control channel resource and the reference signal resource and signal the association to a user equipment (UE) .
  • the UE may use the association to receive the reference signal on the reference signal resource.
  • the UE may use the reference signal to calculate the precoder for the uplink message, generate the uplink message using the precoder, and transmit the uplink message to the base station on the uplink control channel resource.
  • Various methods are described for associating the uplink control channel resource and the reference signal resource.
  • Wireless communications devices operating in a wireless communications network may transmit and/or receive downlink and uplink transmissions using beamformed communications, where such transmissions may have a spatial or directional component that improves signal strength and communication quality.
  • a transmitting device may calculate a spatial precoder, apply the spatial precoder to a set of information, and transmit (e.g., directionally transmit) the precoded information in a message based on the calculated precoder.
  • Calculating a spatial precoder may include selecting a number of spatial layers to use, steering a beam in a particular direction, or the like.
  • the base station may configure the UE with a precoding codebook, and the UE may select a particular entry in the codebook based on a channel estimate for an uplink channel.
  • the UE may determine the channel estimate by measuring a reference signal transmitted by a base station, and ranges for a measured channel estimate may correspond to respective entries in the precoding codebook.
  • the UE may select the codebook entry corresponding to a range in which the measured channel estimate falls.
  • the UE may use the channel estimate to select a codebook entry and precode information for transmission using a transmit beam steered in the direction of the base station based on the selected codebook entry.
  • a base station may associate a reference signal resource with an uplink control channel resource and may indicate the association to a UE in a downlink message.
  • the UE may monitor for and receive a reference signal transmitted by the base station in the reference signal resource and, in some cases, perform a measurement based on the reference signal.
  • the UE may use the reference signal to calculate a spatial precoder for an uplink transmission (e.g., including channel state information (CSI) or other feedback) to the base station, where the uplink transmission may use the uplink control channel resource.
  • the UE may generate the uplink message using the precoder and transmit the uplink message on the uplink control channel resource.
  • CSI channel state information
  • an association scheme for relating the reference signal resource and the uplink control channel resource may consider different reference signal types (e.g., periodic CSI reference signals (CSI-RS) and aperiodic CSI-RS, among others) , and different PUCCH uses (e.g., transmitting uplink control information for acknowledgement/negative acknowledgement (ACK/NACK) feedback and uplink control information for CSI feedback, among others) .
  • CSI-RS periodic CSI reference signals
  • ACK/NACK uplink control information for ACK/NACK
  • the base station may indicate an additional reference signal in the downlink message that includes the association information, and the UE may use the additional reference signal to calculate the spatial precoder for the uplink message.
  • the UE may implement techniques for determining quasi co-location (QCL) information and a slot offset for the additional reference signal.
  • QCL quasi co-location
  • the base station may signal or otherwise configure the UE (e.g., via the downlink message) to use a most recently configured or triggered reference signal to calculate the precoder for the uplink message.
  • the resources for the reference signal may be predefined and stored in the memory of the UE.
  • aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to a slot offset scheme, process flow diagrams, apparatus diagrams, system diagrams, and flowcharts that relate to scheme for associating a reference signal with an uplink control channel.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports scheme for associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the wireless communications system 100 includes base stations 105, UEs 115, and a core network 130.
  • the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • LTE-A Pro LTE-A Pro
  • NR New Radio
  • wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low-cost and low-complexity devices.
  • ultra-reliable e.g., mission critical
  • the geographic coverage area 110 for a base station 105 may be divided into sectors making up a portion of the geographic coverage area 110, and each sector may be associated with a cell.
  • each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations thereof.
  • a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110.
  • different geographic coverage areas 110 associated with different technologies may overlap, and overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.
  • the term “cell” refers to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) , and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) operating via the same or a different carrier.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband Internet-of-Things (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of devices.
  • MTC machine-type communication
  • NB-IoT narrowband Internet-of-Things
  • eMBB enhanced mobile broadband
  • the term “cell” may refer to a portion of a geographic coverage area 110 (e.g., a sector) over which the logical entity operates.
  • UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also 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 the “device” may also be referred to as a unit, a station, a terminal, or a client.
  • a UE 115 may also be a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer.
  • PDA personal digital assistant
  • a UE 115 may also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, or the like, which may be implemented in various articles such as appliances, vehicles, meters, or the like.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC massive machine type communications
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power saving “deep sleep” mode when not engaging in active communications, or operating over a limited bandwidth (e.g., according to narrowband communications) . In some cases, UEs 115 may be designed to support critical functions (e.g., mission critical functions) , and a wireless communications system 100 may be configured to provide ultra-reliable communications for these functions.
  • critical functions e.g., mission critical functions
  • Base stations 105 may communicate with the core network 130 and with one another.
  • base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., via an S1, N2, N3, or other interface) .
  • Base stations 105 may communicate with one another over backhaul links 134 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) .
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • the core network 130 may be an evolved packet core (EPC) , which may include at least one mobility management entity (MME) , at least one serving gateway (S-GW) , and at least one Packet Data Network (PDN) gateway (P-GW) .
  • the MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC.
  • User IP packets may be transferred through the S-GW, which itself may be connected to the P-GW.
  • the P-GW may provide IP address allocation as well as other functions.
  • the P-GW may be connected to the network operators IP services.
  • the operators IP services may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched (PS) Stream
  • At least some of the network devices may include subcomponents such as an access network entity, which may be an example of an access node controller (ANC) .
  • Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, or a transmission/reception point (TRP) .
  • TRP transmission/reception point
  • various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105) .
  • Wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter range (e.g., less than 100 km) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • Wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band.
  • SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) bands, which may be used opportunistically by devices that may be capable of tolerating interference from other users.
  • ISM bands 5 GHz industrial, scientific, and medical bands
  • Wireless communications system 100 may also operate in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band.
  • EHF extremely high frequency
  • wireless communications system 100 may support millimeter wave (mmW) communications between UEs 115 and base stations 105, and EHF antennas of the respective devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate use of antenna arrays within a UE 115.
  • mmW millimeter wave
  • the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. Techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
  • wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz ISM band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz ISM band.
  • wireless devices such as base stations 105 and UEs 115 may employ listen-before-talk (LBT) procedures to ensure a frequency channel is clear before transmitting data.
  • LBT listen-before-talk
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these.
  • Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD) , time division duplexing (TDD) , or a combination of both.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • wireless communications system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115) , where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas.
  • MIMO communications may employ multipath signal propagation to increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing.
  • the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the multiple signals may be referred to as a separate spatial stream, and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams.
  • Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
  • MIMO techniques include single-user MIMO (SU-MIMO) where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) where multiple spatial layers are transmitted to multiple devices.
  • SU-MIMO single-user MIMO
  • MU-MIMO multiple-user MIMO
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude and phase offsets to signals carried via each of the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • a base station 105 may use multiple antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • some signals e.g., synchronization signals, reference signals, beam selection signals, or other control signals
  • Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) , or transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio, or otherwise acceptable signal quality based at least in part on listening according to multiple beam directions) .
  • UEs 115 and base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link 125.
  • HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) .
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions) .
  • a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • the radio frames may be identified by a system frame number (SFN) ranging from 0 to 1023.
  • SFN system frame number
  • Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms.
  • a subframe may be further divided into 2 slots each having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods.
  • a subframe may be the smallest scheduling unit of the wireless communications system 100, and may be referred to as a transmission time interval (TTI) .
  • TTI transmission time interval
  • a smallest scheduling unit of the wireless communications system 100 may be shorter than a subframe or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers using sTTIs) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols.
  • a symbol of a mini-slot or a mini-slot may be the smallest unit of scheduling.
  • Each symbol may vary in duration depending on the subcarrier spacing or frequency band of operation, for example.
  • some wireless communications systems may implement slot aggregation in which multiple slots or mini-slots are aggregated together and used for communication between a UE 115 and a base station 105.
  • carrier refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over a communication link 125.
  • a carrier of a communication link 125 may include a portion of a radio frequency spectrum band that is operated according to physical layer channels for a given radio access technology.
  • Each physical layer channel may carry user data, control information, or other signaling.
  • a carrier may be associated with a pre-defined frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) , and may be positioned according to a channel raster for discovery by UEs 115.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • E-UTRA absolute radio frequency channel number
  • Carriers may be downlink or uplink (e.g., in an FDD mode) , or be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • signal waveforms transmitted over a carrier may be made up of multiple sub-carriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • the organizational structure of the carriers may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • communications over a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding the user data.
  • a carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc. ) and control signaling that coordinates operation for the carrier.
  • acquisition signaling e.g., synchronization signals or system information, etc.
  • control signaling that coordinates operation for the carrier.
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • control information transmitted in a physical control channel may be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces) .
  • some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers) , and the use of multiple spatial layers may further increase the data rate for communications with a UE 115.
  • a spatial resource e.g., spatial layers
  • an eCC may utilize a different symbol duration than other component carriers, which may include use of a reduced symbol duration as compared with symbol durations of the other component carriers.
  • a shorter symbol duration may be associated with increased spacing between adjacent subcarriers.
  • a device such as a UE 115 or base station 105, utilizing eCCs may transmit wideband signals (e.g., according to frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc. ) at reduced symbol durations (e.g., 16.67 microseconds) .
  • a TTI in eCC may consist of one or multiple symbol periods. In some cases, the TTI duration (that is, the number of symbol periods in a TTI) may be variable.
  • Wireless communications system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, among others.
  • the flexibility of eCC symbol duration and subcarrier spacing may allow for the use of eCC across multiple spectrums.
  • NR shared spectrum may increase spectrum utilization and spectral efficiency, specifically through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.
  • the UE 115 may calculate the precoder for the uplink message, may generate the uplink message using the precoder, and may transmit the uplink message on the uplink control channel resources to the base station 105.
  • the base station 105 may use various methods for associating the reference signal resource and the uplink control channel resource.
  • the base station 105 may transmit an RRC message to the UE 115 indicating the association and indicating either an uplink control channel resource or a reference signal resource scheduled for the UE 115.
  • the UE 115 may use the scheduled resource (e.g., uplink control channel resource or reference signal resource) with the association to determine the other resource.
  • the base station 105 may trigger or configure CSI feedback (e.g., to be included in the uplink message) via a downlink message (e.g., RRC message or DCI message) , which may indicate a reference signal for the CSI feedback and indicate uplink control channel resources for transmitting the uplink message.
  • a downlink message e.g., RRC message or DCI message
  • the downlink message may indicate that the reference signal for the CSI feedback should be used for calculating the precoder for the CSI feedback, while, in other cases, the downlink message may indicate that the reference signal for calculating the precoder may be different than the reference signal used for the CSI feedback.
  • the UE 115 may implement techniques for determining QCL information and a slot offset for the different reference signal.
  • the base station 105 may schedule a downlink channel and ACK/NACK feedback via a DCI message, where the DCI message may indicate uplink control channel resources for transmitting the ACK/NACK feedback (e.g., via the uplink message) and may indicate a reference signal to be used for calculating the precoder for the uplink message.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • wireless communications system 200 may implement aspects of wireless communication system 100 and may include a UE 115-a and a base station 105-a, which may be examples of a UE 115 and a base station 105 described with reference to FIG. 1.
  • base station 105-a may signal or otherwise configure UE 115-a to identify and receive a reference signal that may be used to determine precoding information for an uplink message.
  • a base station 105 may signal downlink transmissions to a UE 115, such as physical downlink control channel (PDCCH) transmissions and physical downlink shared channel (PDSCH) transmissions.
  • the UE 115 may signal uplink transmissions to the base station 105, such as PUCCH transmissions and physical uplink shared channel (PUSCH) transmissions.
  • the base station 105 and the UE 115 may communicate using beamformed communications, where transmissions may have a spatial or directional component that improves signal strength and communication quality.
  • a transmitting device may calculate a spatial precoder, apply the spatial precoder to a set of information, and transmit (e.g., directionally transmit) the precoded information in a message based on the calculated precoder.
  • Some wireless communications systems may not provide a spatial transmission scheme for some uplink transmissions, such as PUCCH transmissions.
  • a UE 115 and a base station 105 may implement techniques to enable transmission diversity (e.g., including spatial transmission diversity) for uplink control channel transmissions.
  • UE 115-a may measure a reference signal from base station 105-a to measure the uplink control channel.
  • Some systems may not provide configurations designating reference signals to be used by a UE 115 to calculate a spatial precoder for the uplink control channel (e.g., PUCCH) . Therefore, the techniques herein may further describe schemes for linking a reference signal resource to an uplink control channel resource and using a reference signal received in the reference signal resource to calculate a spatial precoder.
  • base station 105-a may transmit a downlink message 205 to UE 115-a.
  • the downlink message 205 may include an indication of an association 220 between resources for a reference signal 210 (e.g., a CSI-RS) and uplink control channel resources (e.g., PUCCH resources) for a corresponding uplink message 215 (e.g., an uplink control message including CSI or ACK/NACK feedback) .
  • the association 220 may be referred to as a link, relationship, correlation, etc.
  • the reference signal 210 may be an example of a periodic or an aperiodic reference signal as described herein.
  • base station 105-a may configure the association 220 between the uplink control channel resource and the reference signal resource as a part of an RRC configuration.
  • the downlink message 205 may be an example of an RRC message, such as an RRC connection establishment message, an RRC connection reconfiguring message, or another type of RRC message.
  • base station 105-a may configure the association 220 between the uplink control channel resource and the reference signal resource via an indication included in DCI (e.g., a DCI message) .
  • the downlink message 205 may be an example of a downlink control channel transmission (e.g., PDCCH transmission) carrying or including DCI.
  • base station 105-a may signal or otherwise configure UE 115-a (e.g., via downlink message 205) to use the most recently configured or triggered reference signal (e.g., CSI-RS) to calculate the precoder for uplink message 215.
  • the resources for reference signal 210 may be predefined and stored in the memory of UE 115-a, such that UE 115-a may monitor the defined resources to receive reference signal 210 and calculate the precoder.
  • the reference signal for calculating a PUCCH precoder may be stored in memory (e.g., which may not be based on a recently triggered, configured, or received reference signal) .
  • a configuration for the pre-configured reference signal may be predefined and stored in memory at UE 115-a.
  • a UE 115 may not be configured with a reference signal which the UE 115 may use to determine a spatial precoder for an uplink message 315.
  • a reference signal e.g., second reference signal 310
  • the UE 115 may not be configured with a reference signal to use for a spatial precoder calculation, such as when a downlink message 325 includes DCI scheduling ACK/NACK feedback for the uplink message 315.
  • the base station 105 may include an indication of an additional reference signal (e.g., a first reference signal 305) in the downlink message 325. The UE 115 may then use the additional reference signal 305 to calculate a spatial precoder for the uplink message 315.
  • the base station 105 may indicate for the UE 115 to use the first reference signal 305 when triggering CSI reporting or when scheduling uplink control channel resources for ACK/NACK feedback.
  • the UE 115 may look into RRC configurations for a reference signal resource ID and time-frequency occupation information for the first reference signal 305.
  • some RRC configurations may not include QCL assumption information and slot offset information (e.g., a slot offset 320) .
  • the UE 115 may therefore not have a configuration for the QCL and slot offset information to receive the first reference signal 305.
  • the UE 115 may use QCL information and a slot offset 320 of the second reference signal 310 to locate resources for the first reference signal 305.
  • the UE 115 may use the QCL and slot offset information of the second reference signal 310. This may occur, for example, when the base station 105 triggers periodic CSI feedback using PUCCH or when the UE 115 is triggered by DCI for CSI feedback via PUCCH (e.g., when there are two reference signals) .
  • the first reference signal 305 is a periodic signal (e.g., periodic CSI-RS)
  • the UE 115 may identify information for a slot offset 320, as well as the QCL information, associated with the second reference signal 310 in an RRC configuration signaled from the base station 105 to configure the second reference signal 310.
  • the base station 105 may transmit DCI to schedule a downlink channel resource and an uplink control channel resource (e.g., PUCCH resource) for the UE 115, where the UE 115 may transmit ACK/NACK feedback for the downlink channel resource in uplink message 315 on the uplink control channel resource.
  • the base station 105 may indicate an ID for a first reference signal 305 to the UE 115, and the UE 115 may use the first reference signal 305 to calculate a spatial precoder for the uplink message 315.
  • the slot offset 320 and the QCL information may be predefined and stored in memory within the UE 115.
  • the UE 115 may be configured with a number of symbols or slots preceding the PUCCH resources scheduled for uplink message 315, as the slot offset 320.
  • the UE 115 may be configured to use QCL information for receiving the first reference signal 305 that is the same as the QCL information as a demodulation reference signal (DMRS) of a PDCCH including the DCI that schedules the PUCCH resources for uplink message 315.
  • DMRS demodulation reference signal
  • uplink message 315 may include ACK/NACK or CSI feedback. Therefore, the QCL of the CSI-RS may be the same as the QCL of the DMRS in the PDCCH including the DCI.
  • slot offset 320 and the QCL information may be stored in memory within the UE 115.
  • FIG. 4 illustrates an example of a process flow 400 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • process flow 400 may implement aspects of wireless communication systems 100 or 200.
  • Process flow 400 may be implemented by a UE 115-b and a base station 105-b, which may be examples of a UE 115 and a base station 105 described with reference to FIGs. 1–3.
  • base station 105-b may transmit a reference signal to UE 115-b within the reference signal resource.
  • UE 115-b may calculate a spatial precoder based on the reference signal received at 410.
  • UE 115-b may generate a channel estimate for the PUCCH resource based on the reference signal (e.g., based on a measurement of the reference signal) , where the spatial precoder may be calculated based on the channel estimate.
  • UE 115-b may precode information for an uplink message based on the calculated spatial precoder.
  • the RRC message at 405 may configure UE 115-b with the uplink control channel resource and indicate that an ID of the reference signal resource is associated with an ID of the uplink control channel resource (e.g., the PUCCH resource for the uplink message) .
  • base station 105-b may configure PUCCH resources (e.g., via an RRC configuration) for one or more uplink messages (e.g., including the uplink message to be sent by UE 115-b) .
  • UE 115-b may monitor, at 410, for a reference signal within the resources corresponding to the periodic and/or aperiodic CSI-RS resource IDs in response to the RRC messaging configuring the PUCCH resources.
  • UE 115-b may measure one or more reference signals corresponding to the periodic CSI-RS and/or aperiodic CSI-RS resource ID indicated in the RRC message to generate a channel estimate and may calculate a spatial precoder at 415 using the channel estimate.
  • UE 115-b may generate an uplink message by precoding control information at 420, using the calculated spatial precoder, and may transmit the generated uplink message at 425. Therefore, UE 115-b may receive a reference signal within the reference signal resource corresponding to the resource ID indicated in the RRC message and transmit the uplink message in the uplink control channel resource corresponding to the resource ID indicated in the RRC message.
  • UE 115-b may monitor resources corresponding to the periodic and/or aperiodic CSI-RS resource IDs indicated in the RRC message in response to the RRC message configuring the aperiodic CSI-RS or triggering the periodic CSI-RS.
  • UE 115-b may measure one or more reference signals corresponding to the periodic CSI-RS and/or aperiodic CSI-RS resource ID indicated in the RRC message to generate a channel estimate, and may calculate a spatial precoder at 415, using the channel estimate.
  • UE 115-b may generate an uplink message by precoding control information at 420, using the calculated spatial precoder, and may transmit the generated uplink message at 425. Therefore, UE 115-b may receive a reference signal within the reference signal resource corresponding to the resource ID indicated in the RRC message and transmit an uplink message using the uplink resources corresponding to the associated uplink control channel resource ID indicated in the RRC message.
  • UE 115-b may receive the RRC message at 405 which indicates a PUCCH resource and triggers UE 115-b to provide periodic CSI feedback using the indicated PUCCH resource.
  • the RRC message may also indicate a periodic CSI-RS and/or aperiodic CSI-RS resource ID for a different reference signal that UE 115-b is to use for calculating a spatial precoder.
  • UE 115-b, at 410, may monitor for the periodic CSI-RS in response to the RRC triggering to generate CSI feedback.
  • UE 115-b may measure the different reference signal corresponding to the periodic CSI-RS and/or aperiodic CSI-RS resource ID indicated in the RRC message to generate a channel estimate, and may calculate the spatial precoder at 415, using the channel estimate.
  • UE 115-b may generate an uplink message by precoding control information (e.g., the CSI feedback and/or control other information) at 420, using the calculated spatial precoder.
  • UE 115-b may transmit the generated uplink message to base station 105-b.
  • UE 115-b may determine the resources for receiving the reference signal using the resource ID for the reference signal resource indicated in the RRC message and may transmit the uplink message within the uplink resources corresponding to the associated uplink control channel resource ID indicated in the RRC message.
  • the third example is further described herein with reference FIG. 6.
  • the RRC message sent by base station 105-b may trigger UE 115-b to provide CSI feedback for the reference signal (e.g., provide periodic CSI reference signal feedback) , where the feedback may be transmitted via the uplink message and using the uplink control channel resource indicated in the RRC message.
  • UE 115-b may determine that the reference signal resource is associated with the uplink control channel resource based on the RRC message.
  • the UE 115-b may implicitly determine to use the reference signal associated with the CSI feedback (e.g., the triggered periodic CSI-RS) to calculate the precoder, based on the RRC message indicating the resource for the reference signal within the RRC message (e.g., using a reference signal resource ID, such as a CSI-RS ID) .
  • the RRC message may, in some cases, not include an explicit indication of the association between the reference signal resource and the uplink control channel resource.
  • the RRC message may indicate a location of the uplink control channel resource (e.g., via a PUCCH resource ID) on which to transmit the CSI feedback.
  • UE 115-b may, at 410, monitor resources corresponding to the periodic CSI-RS in response to the RRC message triggering the periodic CSI-RS.
  • UE 115-b may measure one or more reference signals corresponding to the periodic CSI-RS to generate a channel estimate, and may calculate a spatial precoder at 415 using the channel estimate.
  • UE 115-b may generate an uplink message by precoding the control information (e.g., CSI feedback and/or other control information) at 420, using the calculated spatial precoder.
  • UE 115-b may transmit the generated uplink message at 425.
  • the operations between UE 115-c and base station 105-c may be transmitted in a different order than the order shown, or the operations performed by base station 105-c and UE 115-c may be performed in different orders or at different times. Some operations may also be left out of the process flow 500, or other operations may be added to the process flow 500. It is to be understood that while base station 105-c and UE 115-c are shown performing a number of the operations of process flow 500, any wireless device may perform the operations shown.
  • base station 105-c may transmit a DCI message (e.g., a downlink message within a PDCCH) to UE 115-c.
  • UE 115-b may identify an association between a reference signal resource and an uplink control channel resource based on receiving the DCI message.
  • the DCI message may be an example of DCI as described with reference to FIGs. 2 and 3.
  • base station 105-c may transmit the reference signal to UE 115-c within the reference signal resource.
  • UE 115-c may calculate a spatial precoder based on the reference signal received at 510.
  • UE 115-c may generate a channel estimate for the PUCCH resource based on the reference signal (e.g., a measurement of the reference signal) , where the spatial precoder may be calculated based on the channel estimate.
  • UE 115-c may precode information for an uplink message based on the calculated spatial precoder.
  • UE 115-c may transmit the uplink message (e.g., CSI or ACK/NACK feedback) to base station 105-c, where UE 115-c may generate the uplink message based on the precoded information and may transmit the uplink message on the indicated PUCCH resource.
  • uplink message e.g., CSI or ACK/NACK feedback
  • base station 105-c may transmit the uplink message based on the precoded information and may transmit the uplink message on the indicated PUCCH resource.
  • the following may describe different techniques or variations of configuring the association between the reference signal resource and the uplink control channel resource.
  • the DCI message may configure UE 115-c with an uplink control channel resource (e.g., PUCCH resource) and may indicate that an ID of a reference signal resource is associated with an ID of the uplink control channel resource.
  • base station 105-c may associate one or more PUCCH resource IDs with one or more reference signal resource IDs and may include the associated IDs in the DCI message.
  • UE 115-c may receive the DCI message and identify an association between the reference signal resource and the uplink control channel resource.
  • UE 115-c may be configured to transmit an uplink message on the uplink control channel resource. Accordingly, UE 115-c may receive a reference signal on the reference signal resource and may calculate a spatial precoder for the uplink message based on the reference signal.
  • the DCI message at 505 may schedule a downlink data channel (e.g., PDSCH) and may schedule the PUCCH resource such that UE 115-c may provide acknowledgement feedback (e.g., ACK/NACK feedback) for the downlink data channel within the uplink message.
  • the DCI message may schedule a PDSCH resource (e.g., for a data transmission) and may schedule ACK/NACK feedback for the PDSCH in the PUCCH resource.
  • the DCI message may indicate the reference signal resource.
  • the DCI message may indicate a reference signal resource ID (e.g., for a periodic or an aperiodic reference signal, such as CSI-RS) for UE 115-b to receive and use to calculate the precoder.
  • UE 115-c may identify QCL information of a DMRS of the PDCCH including the DCI message and determine a slot offset based on the PUCCH resource.
  • UE 115-c may monitor, at 510, for the reference signal within the reference signal resource based on the slot offset and using the QCL information of the DMRS.
  • UE 115-c may store, in memory, a defined slot offset and an indication to determine a QCL relationship from a DMRS, where the slot offset and the QCL relationship may support monitoring for the reference signal on the reference signal resource.
  • the slot offset may be a number of symbols or slots preceding the PUCCH resource.
  • UE 115-c may measure the reference signal corresponding to the CSI-RS resource ID indicated in the DCI to generate a channel estimate.
  • UE 115-c may calculate a spatial precoder at 515 using the channel estimate.
  • UE 115-c may generate an uplink message by precoding control information (e.g., the acknowledgement feedback and/or other control information) at 520, using the calculated spatial precoder.
  • UE 115-c may transmit the generated uplink message at 525.
  • UE 115-c may receive the DCI message at 505, where the DCI may indicate a PUCCH resource and may trigger UE 115-c to provide CSI feedback using the indicated PUCCH resource.
  • the DCI may also indicate a periodic CSI-RS and/or aperiodic CSI-RS resource ID for a different reference signal that UE 115-c is to use for calculating a spatial precoder.
  • UE 115-c may monitor for the CSI-RS at 510 in response to the DCI to generate CSI feedback.
  • UE 115-c may measure one or more reference signals corresponding to the periodic CSI-RS and/or aperiodic CSI-RS resource ID indicated in the DCI message to generate a channel estimate, and may calculate the spatial precoder at 515, using the channel estimate.
  • UE 115-c may generate an uplink message by precoding control information (e.g., the CSI feedback and/or other control information) at 520, using the calculated spatial precoder.
  • UE 115-c may transmit the generated uplink message to base station 105-c.
  • UE 115-c may use the resource ID for the reference signal resource in the DCI message and the associated uplink control channel resource ID from the reference signal configuration to determine the resources for receiving the reference signal and transmitting the uplink message, respectively.
  • This second example is further described herein with reference to FIG. 6.
  • the DCI message 505 sent by base station 105-c may trigger UE 115-c to provide CSI feedback in the uplink message for the reference signal (e.g., periodic or aperiodic reference signal, such as CSI-RS) , using the uplink control channel resource.
  • the reference signal e.g., periodic or aperiodic reference signal, such as CSI-RS
  • UE 115-c may identify that the reference signal resource is associated with a PUCCH resource based on the DCI message.
  • the UE 115-c may implicitly determine to use the reference signal associated with the CSI feedback (e.g., CSI-RS) for calculating the precoder based on the DCI message indicating the resource for the reference signal (e.g., using a reference signal resource ID, such as a CSI-RS ID) .
  • the DCI message may, in some cases, not include an explicit indication of the association between the reference signal resource and the uplink control channel resource.
  • the CSI feedback triggered in this third example may be periodic or aperiodic.
  • the DCI message may indicate a location of the uplink control channel resource (e.g., via a PUCCH resource ID) on which to transmit the CSI feedback.
  • FIG. 6 illustrates an example of a process flow 600 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • process flow 600 may implement aspects of wireless communication systems 100 or 200. Additionally, process flow 600 may implement aspects of slot offset scheme 300.
  • Process flow 600 may be implemented by a UE 115-d and a base station 105-d, which may be examples of a UE 115 and a base station 105 described with reference to FIGs. 1–5.
  • the operations between UE 115-d and base station 105-d may be transmitted in a different order than the order shown, or the operations performed by base station 105-d and UE 115-d may be performed in different orders or at different times. Some operations may also be left out of the process flow 600, or other operations may be added to the process flow 600. It is to be understood that while base station 105-d and UE 115-d are shown performing a number of the operations of process flow 600, any wireless device may perform the operations shown.
  • base station 105-d may transmit a downlink message to UE 115-d.
  • UE 115-d may identify an association between a reference signal resource and an uplink control channel resource based on receiving the downlink message.
  • the downlink message may be an example of an RRC message as described with reference to FIGs. 2–4.
  • the downlink message may be an example of DCI as described with reference to FIGs. 2, 3, and 5.
  • base station 105-d may transmit a first reference signal to UE 115-d within the reference signal resource, where the first reference signal may be a reference signal used for calculating a spatial precoder.
  • base station 105-d may transmit a second reference signal to UE 115-d, where the second reference signal may be a reference signal used for determining CSI feedback.
  • UE 115-d may calculate the spatial precoder based on the first reference signal received at 610. In some cases, UE 115-d may generate a channel estimate for the PUCCH resource based on the first reference signal, where the spatial precoder may be calculated based on the channel estimate. At 625, UE 115-d may precode information (e.g., CSI feedback based on the second reference signal) for the uplink message based on the calculated spatial precoder.
  • information e.g., CSI feedback based on the second reference signal
  • UE 115-d may transmit the uplink message to base station 105-d, where UE 115-d may generate the uplink message based on the precoded information and may transmit the uplink message on the indicated PUCCH resource.
  • the following may describe different techniques or variations of configuring the association between the reference signal resource and the uplink control channel resource.
  • the downlink message may configure UE 115-d with an uplink control channel resource (e.g., PUCCH resource) and may indicate that an ID of a reference signal resource is associated with an ID of the uplink control channel resource.
  • base station 105-d may associate one or more PUCCH resource IDs with one or more reference signal resource IDs and may include the associated IDs in the downlink message.
  • UE 115-d may receive the downlink message and identify an association between the reference signal resource and the uplink control channel resource.
  • UE 115-d may be configured to transmit an uplink message on the uplink control channel resource. Accordingly, UE 115-d may receive a first reference signal on the reference signal resource and may calculate a spatial precoder for the uplink message based on the first reference signal.
  • the downlink message sent by base station 105-d may trigger UE 115-d to provide CSI feedback for a second reference signal in the uplink message using the PUCCH resource, where the first reference signal may be different than the second reference signal.
  • the downlink message may trigger CSI feedback in the uplink message and may specify a CSI-RS (e.g., the second reference signal) to use for the CSI feedback (e.g., via a reference signal resource ID or CSI-RS ID) .
  • the downlink message may indicate an ID of the first reference signal (e.g., for the spatial precoder) , and UE 115-d may identify that the reference signal resource is associated with the uplink control channel resource based on the downlink message.
  • the downlink message may indicate that UE 115-d is to use an additional reference signal (e.g., the first reference signal, such as a periodic or an aperiodic CSI-RS) for calculating the precoder, where the additional reference signal may be different from the reference signal associated with the CSI feedback (e.g., the second reference signal or CSI-RS) .
  • the downlink message may indicate the resource for the first reference signal, as well as resource for the second reference signal, using reference signal resource IDs (e.g., CSI-RS IDs) .
  • the downlink message may indicate a location of the uplink control channel resource (e.g., via a PUCCH resource ID) on which to transmit the CSI feedback.
  • UE 115-d may determine a slot offset and a QCL relationship for the second reference signal based on the downlink message, where the slot offset and the QCL relationship may enable UE 115-d to monitor for the first reference signal on the reference signal resource. Accordingly, UE 115-d may monitor for the first reference signal within the reference signal resource, based on the slot offset and the QCL relationship for the second reference signal. For example, UE 115-d may be configured by the downlink message (e.g., an RRC or DCI message) to determine the slot offset and the QCL relationship of the second reference signal (e.g., DCI has QCL information) , and may use this information to monitor for the first reference signal.
  • the downlink message e.g., an RRC or DCI message
  • UE 115-d may include within its memory a defined slot offset and an indication to determine a QCL relationship from a DMRS of a DCI message scheduling CSI feedback (e.g., the downlink message) , and may use this information to monitor for the first reference signal.
  • the slot offset may be a number of symbols or slots preceding the PUCCH resource.
  • the downlink message may be an RRC message.
  • UE 115-d may receive the RRC message at 605, where the RRC message may indicate a PUCCH resource and may trigger UE 115-d to provide periodic CSI feedback using the indicated PUCCH resource.
  • the RRC message may also indicate a periodic CSI-RS and/or aperiodic CSI-RS resource ID for a different reference signal (e.g., the first reference signal transmitted at 615) that UE 115-d is to use for calculating a spatial precoder.
  • UE 115-d may monitor for the periodic CSI-RS at 610 and/or 615 in response to the RRC triggering to generate CSI feedback.
  • UE 115-d may use the slot offset and QCL information of the second reference signal (e.g., CSI-RS for generating CSI feedback) as the slot offset and QCL information for receiving the first reference signal (e.g., use the same slot offset and QCL information to receive both the first and second reference signals) .
  • the second reference signal e.g., CSI-RS for generating CSI feedback
  • the slot offset and QCL information for receiving the first reference signal e.g., use the same slot offset and QCL information to receive both the first and second reference signals
  • UE 115-d may determine the slot offset and QCL information of the second reference signal to be received at 615 for generating CSI feedback (e.g., where a DMRS of a PDCCH including the DCI may include slot offset and/or QCL information) , and may use that same slot offset and QCL information to receive the first reference signal (e.g., periodic CSI-RS or aperiodic CSI-RS for calculating a spatial precoder) at 610.
  • the second reference signal may be transmitted prior the first reference signal.
  • UE 115-d may measure the first reference signal corresponding to the periodic CSI-RS and/or aperiodic CSI-RS resource ID indicated in the RRC message using the same slot offset and QCL information as the second reference signal for generating a channel estimate, and may calculate the spatial precoder at 620, using the channel estimate.
  • UE 115-d may generate an uplink message by precoding control information (e.g., the CSI feedback and/or other control information) at 625, using the calculated spatial precoder.
  • UE 115-d may transmit the generated uplink message to base station 105-d.
  • the downlink message may be a PDCCH transmission including DCI.
  • UE 115-d may receive the DCI at 605, where the DCI may indicate a PUCCH resource and may trigger UE 115-d to provide periodic CSI feedback using the indicated PUCCH resource.
  • the DCI may also indicate a periodic CSI-RS and/or aperiodic CSI-RS resource ID for a different reference signal (e.g., the first reference signal transmitted at 615) that UE 115-d is to use for calculating a spatial precoder.
  • UE 115-d may monitor for the periodic CSI-RS at 610 in response to the RRC triggering to generate CSI feedback.
  • UE 115-d may use the slot offset and QCL information of the second reference signal for the first reference signal. For example, UE 115-d may determine the slot offset and QCL information of the second reference signal at 615, and may use that slot offset and QCL information to receive the first reference signal at 610. In some cases, the second reference signal may be transmitted prior the first reference signal. At 615, UE 115-d may measure the first reference signal corresponding to the periodic CSI-RS and/or aperiodic CSI-RS resource ID indicated in the RRC message using the same slot offset and QCL information as the second reference for generating a channel estimate, and may calculate the spatial precoder at 620, using the channel estimate.
  • UE 115-d may generate an uplink message by precoding control information (e.g., the CSI feedback and/or other control information) at 625, using the calculated spatial precoder. At 630, UE 115-d may transmit the generated uplink message to base station 105-d.
  • control information e.g., the CSI feedback and/or other control information
  • FIG. 7 shows a block diagram 700 of a device 705 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the device 705 may be an example of aspects of a UE 115 as described herein.
  • the device 705 may include a receiver 710, a communications manager 715, and a transmitter 720.
  • the device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 710 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 scheme for associating a reference signal with an uplink control channel, etc. ) . Information may be passed on to other components of the device 705.
  • the receiver 710 may be an example of aspects of the transceiver 1020 described with reference to FIG. 10.
  • the receiver 710 may utilize a single antenna or a set of antennas.
  • the communications manager 715 may identify an association between a reference signal resource and an uplink control channel resource, receive a first reference signal within the reference signal resource, calculate a spatial precoder based on the first reference signal, precode information based on the spatial precoder, and transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • the communications manager 715 may be an example of aspects of the communications manager 1010 described herein.
  • the communications manager 715 may be implemented in hardware, 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 communications manager 715, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (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.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • the communications manager 715 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the communications manager 715, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 715, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 720 may transmit signals generated by other components of the device 705.
  • the transmitter 720 may be collocated with a receiver 710 in a transceiver module.
  • the transmitter 720 may be an example of aspects of the transceiver 1020 described with reference to FIG. 10.
  • the transmitter 720 may utilize a single antenna or a set of antennas.
  • communications manager 715 may increase communication reliability and decrease communication latency at a UE 115 by enabling the UE 115 to precode uplink control channel transmissions to a base station 105, which may increase transmission accuracy, thereby decreasing transmission delays and retransmissions.
  • Communications manager 715 may save power and increase battery life at a UE 115 by reducing transmission delays and retransmissions.
  • FIG. 8 shows a block diagram 800 of a device 805 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the device 805 may be an example of aspects of a device 705, or a UE 115 as described herein.
  • the device 805 may include a receiver 810, a communications manager 815, and a transmitter 845.
  • the device 805 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 810 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 scheme for associating a reference signal with an uplink control channel, etc. ) . Information may be passed on to other components of the device 805.
  • the receiver 810 may be an example of aspects of the transceiver 1020 described with reference to FIG. 10.
  • the receiver 810 may utilize a single antenna or a set of antennas.
  • the communications manager 815 may be an example of aspects of the communications manager 715 as described herein.
  • the communications manager 815 may include an association component 820, a reference signal receiving component 825, a spatial precoder calculating component 830, a precoding component 835, and an uplink message transmitting component 840.
  • the communications manager 815 may be an example of aspects of the communications manager 1010 described herein.
  • the association component 820 may identify an association between a reference signal resource and an uplink control channel resource.
  • the reference signal receiving component 825 may receive a first reference signal within the reference signal resource.
  • the spatial precoder calculating component 830 may calculate a spatial precoder based on the first reference signal.
  • the precoding component 835 may precode information based on the spatial precoder.
  • the uplink message transmitting component 840 may transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • the transmitter 845 may transmit signals generated by other components of the device 805.
  • the transmitter 845 may be collocated with a receiver 810 in a transceiver module.
  • the transmitter 845 may be an example of aspects of the transceiver 1020 described with reference to FIG. 10.
  • the transmitter 845 may utilize a single antenna or a set of antennas.
  • a processor of a UE 115 may increase communication reliability and accuracy by enabling the UE 115 to precode uplink control channel transmissions to a base station 105, which may increase transmission accuracy, thereby decreasing transmission delays and retransmissions (e.g., via implementation of system components described with reference to FIG. 9) .
  • the processor of the UE 115 may identify one or more aspects of a subscription ID protection scheme or encryption process to perform the processes described herein.
  • the processor of the UE 115 may identify protection scheme IDs or connectivity methods for the UE 115 to save power and increase battery life at the UE 115 (e.g., by strategically reducing a number of failed registration attempts by the UE 115) .
  • FIG. 9 shows a block diagram 900 of a communications manager 905 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the communications manager 905 may be an example of aspects of a communications manager 715, a communications manager 815, or a communications manager 1010 described herein.
  • the communications manager 905 may include an association component 910, a reference signal receiving component 915, a spatial precoder calculating component 920, a precoding component 925, an uplink message transmitting component 930, and a slot offset and QCL component 935. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the association component 910 may identify an association between a reference signal resource and an uplink control channel resource. In some examples, the association component 910 may receive a downlink message that configures the UE with the uplink control channel resource and indicates that an ID of the reference signal resource is associated with an ID of the uplink control channel resource. In some examples, the association component 910 may receive a downlink message that triggers or configures the first reference signal and indicates that a reference signal ID for the first reference signal is associated with an ID for the uplink control channel resource.
  • the association component 910 may receive a downlink message that triggers the UE to provide CSI feedback in the uplink message for a second reference signal using the uplink control channel resource and indicates an ID of the first reference signal, where the first reference signal is different than the second reference signal. In some examples, the association component 910 may identify that the reference signal resource is associated with the uplink control channel resource based on the downlink message.
  • the association component 910 may receive a downlink message that triggers the UE to provide CSI feedback in the uplink message for the first reference signal using the uplink control channel resource, where the first reference signal is a periodic reference signal. In some examples, the association component 910 may receive a downlink message that schedules a downlink data channel and the uplink control channel resource for the UE to provide acknowledgement feedback for the downlink data channel within the uplink message and indicates the reference signal resource.
  • the association component 910 may receive a downlink message that triggers the UE to provide CSI feedback within the uplink message for a second reference signal using the uplink control channel resource and indicates the reference signal resource, where the second reference signal is different than the first reference signal. In some examples, the association component 910 may receive a downlink message that triggers the UE to provide CSI feedback for the reference signal resource within the uplink message using the uplink control channel resource. In some examples, the association component 910 may identify that the reference signal resource is associated with the uplink control channel resource based on the downlink message. In some cases, the second reference signal is a periodic reference signal. In some cases, the downlink message is an RRC message. In some cases, the downlink message is DCI.
  • the association is identified based least in part on the reference signal resource being a most recently configured or triggered reference signal resource. In some cases, the association is identified based least in part on the reference signal resource being stored in memory.
  • the reference signal receiving component 915 may receive a first reference signal within the reference signal resource.
  • the first reference signal is a periodic reference signal, an aperiodic reference signal, or a CSI-RS.
  • the spatial precoder calculating component 920 may calculate a spatial precoder based on the first reference signal.
  • the precoding component 925 may precode information based on the spatial precoder.
  • the precoding component 925 may generate a channel estimate for the uplink control channel resource based on the first reference signal, where the spatial precoder is calculated based on the channel estimate.
  • the uplink message transmitting component 930 may transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • the slot offset and QCL component 935 may determine a slot offset and a QCL relationship for the second reference signal based on the downlink message. In some examples, the slot offset and QCL component 935 may monitor for the first reference signal within the reference signal resource based on the slot offset and the QCL relationship for the second reference signal. In some examples, the slot offset and QCL component 935 may determine a QCL relationship for a DMRS of a downlink control channel carrying the downlink message. In some examples, the slot offset and QCL component 935 may determine a slot offset based on the uplink control channel resource. In some examples, the slot offset and QCL component 935 may monitor for the first reference signal within the reference signal resource based on the slot offset and the QCL relationship for the DMRS.
  • FIG. 10 shows a diagram of a system 1000 including a device 1005 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the device 1005 may be an example of or include the components of device 705, device 805, or a UE 115 as described herein.
  • the device 1005 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1010, an I/O controller 1015, a transceiver 1020, an antenna 1025, memory 1030, and a processor 1040. These components may be in electronic communication via one or more buses (e.g., bus 1045) .
  • buses e.g., bus 1045
  • the communications manager 1010 may identify an association between a reference signal resource and an uplink control channel resource, receive a first reference signal within the reference signal resource, calculate a spatial precoder based on the first reference signal, precode information based on the spatial precoder, and transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • the I/O controller 1015 may manage input and output signals for the device 1005.
  • the I/O controller 1015 may also manage peripherals not integrated into the device 1005.
  • the I/O controller 1015 may represent a physical connection or port to an external peripheral.
  • the I/O controller 1015 may utilize an operating system such as or another known operating system.
  • the I/O controller 1015 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 1015 may be implemented as part of a processor.
  • a user may interact with the device 1005 via the I/O controller 1015 or via hardware components controlled by the I/O controller 1015.
  • the transceiver 1020 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1020 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1020 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1025. However, in some cases the device may have more than one antenna 1025, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1030 may include random access memory (RAM) and read only memory (ROM) .
  • the memory 1030 may store computer-readable, computer-executable code 1035 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 1030 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • BIOS basic I/O system
  • the processor 1040 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) .
  • the processor 1040 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 1040.
  • the processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting scheme for associating a reference signal with an uplink control channel) .
  • the code 1035 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1035 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1035 may not be directly executable by the processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 11 shows a block diagram 1100 of a device 1105 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the device 1105 may be an example of aspects of a base station 105 as described herein.
  • the device 1105 may include a receiver 1110, a communications manager 1115, and a transmitter 1120.
  • the device 1105 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 1110 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 scheme for associating a reference signal with an uplink control channel, etc. ) . Information may be passed on to other components of the device 1105.
  • the receiver 1110 may be an example of aspects of the transceiver 1420 described with reference to FIG. 14.
  • the receiver 1110 may utilize a single antenna or a set of antennas.
  • the communications manager 1115 may identify an association between a reference signal resource and an uplink control channel resource, transmit, to a UE, a first reference signal within the reference signal resource, and monitor the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • the communications manager 1115 may be an example of aspects of the communications manager 1410 described herein.
  • the communications manager 1115 may be implemented in hardware, 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 communications manager 1115, or its sub-components may be executed by a general-purpose processor, a DSP, an ASIC, a 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.
  • code e.g., software or firmware
  • the functions of the communications manager 1115, or its sub-components may be executed by a general-purpose processor, a DSP, an ASIC, a 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.
  • the communications manager 1115 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the communications manager 1115, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 1115, or its sub-components may be combined with one or more other hardware components, including but not limited to an I/O component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • the transmitter 1120 may transmit signals generated by other components of the device 1105.
  • the transmitter 1120 may be collocated with a receiver 1110 in a transceiver module.
  • the transmitter 1120 may be an example of aspects of the transceiver 1420 described with reference to FIG. 14.
  • the transmitter 1120 may utilize a single antenna or a set of antennas.
  • FIG. 12 shows a block diagram 1200 of a device 1205 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the device 1205 may be an example of aspects of a device 1105, or a base station 105 as described herein.
  • the device 1205 may include a receiver 1210, a communications manager 1215, and a transmitter 1235.
  • the device 1205 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 1210 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 scheme for associating a reference signal with an uplink control channel, etc. ) . Information may be passed on to other components of the device 1205.
  • the receiver 1210 may be an example of aspects of the transceiver 1420 described with reference to FIG. 14.
  • the receiver 1210 may utilize a single antenna or a set of antennas.
  • the communications manager 1215 may be an example of aspects of the communications manager 1115 as described herein.
  • the communications manager 1215 may include an association manager 1220, a reference signal transmitting component 1225, and an uplink control channel monitoring component 1230.
  • the communications manager 1215 may be an example of aspects of the communications manager 1410 described herein.
  • the association manager 1220 may identify an association between a reference signal resource and an uplink control channel resource.
  • the reference signal transmitting component 1225 may transmit, to a UE, a first reference signal within the reference signal resource.
  • the uplink control channel monitoring component 1230 may monitor the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • the transmitter 1235 may transmit signals generated by other components of the device 1205.
  • the transmitter 1235 may be collocated with a receiver 1210 in a transceiver module.
  • the transmitter 1235 may be an example of aspects of the transceiver 1420 described with reference to FIG. 14.
  • the transmitter 1235 may utilize a single antenna or a set of antennas.
  • FIG. 13 shows a block diagram 1300 of a communications manager 1305 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the communications manager 1305 may be an example of aspects of a communications manager 1115, a communications manager 1215, or a communications manager 1410 described herein.
  • the communications manager 1305 may include an association manager 1310, a reference signal transmitting component 1315, an uplink control channel monitoring component 1320, and a slot offset and QCL manager 1325. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the association manager 1310 may identify an association between a reference signal resource and an uplink control channel resource. In some examples, the association manager 1310 may transmit a downlink message that configures the UE with the uplink control channel resource and indicates that an ID of the reference signal resource is associated with an ID of the uplink control channel resource. In some examples, the association manager 1310 may transmit a downlink message that triggers or configures the first reference signal and indicates that a reference signal ID for the first reference signal is associated with an ID for the uplink control channel resource.
  • the association manager 1310 may transmit a downlink message that triggers the UE to provide CSI feedback in the uplink message for a second reference signal using the uplink control channel resource and indicates an ID of the first reference signal, where the first reference signal is different than the second reference signal. In some examples, the association manager 1310 may transmit a downlink message that triggers the UE to provide CSI feedback in the uplink message for the first reference signal using the uplink control channel resource, where the first reference signal is a periodic reference signal.
  • the association manager 1310 may transmit a downlink message that schedules a downlink data channel and the uplink control channel resource for the UE to provide acknowledgement feedback for the downlink data channel within the uplink message and indicates the reference signal resource. In some examples, the association manager 1310 may transmit a downlink message that triggers the UE to provide CSI feedback within the uplink message for a second reference signal using the uplink control channel resource and indicates the reference signal resource, where the second reference signal is different than the first reference signal. In some examples, the association manager 1310 may transmit a downlink message that triggers the UE to provide CSI feedback for the reference signal resource within the uplink message using the uplink control channel resource. In some cases, the second reference signal is a periodic reference signal. In some cases, the downlink message is an RRC message. In some cases, the downlink message is DCI.
  • the association is identified based least in part on the reference signal resource being a most recently configured or triggered reference signal resource. In some cases, the association is identified based least in part on the reference signal resource being stored in memory.
  • the reference signal transmitting component 1315 may transmit, to a UE, a first reference signal within the reference signal resource.
  • the first reference signal is a periodic reference signal, an aperiodic reference signal, or a CSI-RS.
  • the uplink control channel monitoring component 1320 may monitor the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • the slot offset and QCL manager 1325 may determine a slot offset and a QCL relationship for the second reference signal, where the first reference signal is transmitted within the reference signal resource based on the slot offset and the QCL relationship for the second reference signal. In some examples, the slot offset and QCL manager 1325 may determine a QCL relationship for a DMRS of a downlink control channel carrying the downlink message. In some examples, the slot offset and QCL manager 1325 may determine a slot offset based on the uplink control channel resource, where the first reference signal is transmitted within the reference signal resource based on the slot offset and the QCL relationship for the DMRS.
  • FIG. 14 shows a diagram of a system 1400 including a device 1405 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the device 1405 may be an example of or include the components of device 1105, device 1205, or a base station 105 as described herein.
  • the device 1405 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1410, a network communications manager 1415, a transceiver 1420, an antenna 1425, memory 1430, a processor 1440, and an inter-station communications manager 1445. These components may be in electronic communication via one or more buses (e.g., bus 1450) .
  • buses e.g., bus 1450
  • the communications manager 1410 may identify an association between a reference signal resource and an uplink control channel resource, transmit, to a UE, a first reference signal within the reference signal resource, and monitor the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • the network communications manager 1415 may manage communications with the core network (e.g., via one or more wired backhaul links) .
  • the network communications manager 1415 may manage the transfer of data communications for client devices, such as one or more UEs 115.
  • the transceiver 1420 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1420 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1420 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1425. However, in some cases the device may have more than one antenna 1425, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1430 may include RAM, ROM, or a combination thereof.
  • the memory 1430 may store computer-readable code 1435 including instructions that, when executed by a processor (e.g., the processor 1440) cause the device to perform various functions described herein.
  • a processor e.g., the processor 1440
  • the memory 1430 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 1440 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) .
  • the processor 1440 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into processor 1440.
  • the processor 1440 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1430) to cause the device 1405 to perform various functions (e.g., functions or tasks supporting scheme for associating a reference signal with an uplink control channel) .
  • the inter-station communications manager 1445 may manage communications with other base station 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communications manager 1445 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager 1445 may provide an X2 interface within an LTE/LTE-A wireless communication network technology to provide communication between base stations 105.
  • the code 1435 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1435 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1435 may not be directly executable by the processor 1440 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • the UE may identify an association between a reference signal resource and an uplink control channel resource.
  • the operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by an association component as described with reference to FIGs. 7 through 10.
  • the UE may receive a first reference signal within the reference signal resource.
  • the operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by a reference signal receiving component as described with reference to FIGs. 7 through 10.
  • the UE may calculate a spatial precoder based on the first reference signal.
  • the operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by a spatial precoder calculating component as described with reference to FIGs. 7 through 10.
  • FIG. 16 shows a flowchart illustrating a method 1600 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the operations of method 1600 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1600 may be performed by a communications manager as described with reference to FIGs. 7 through 10.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may identify an association between the reference signal resource and the uplink control channel resource.
  • the operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by an association component as described with reference to FIGs. 7 through 10.
  • the UE may calculate a spatial precoder based on the first reference signal.
  • the operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by a spatial precoder calculating component as described with reference to FIGs. 7 through 10.
  • FIG. 17 shows a flowchart illustrating a method 1700 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the operations of method 1700 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1700 may be performed by a communications manager as described with reference to FIGs. 7 through 10.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may identify an association between the reference signal resource and the uplink control channel resource.
  • the operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by an association component as described with reference to FIGs. 7 through 10.
  • the UE may calculate a spatial precoder based on the first reference signal.
  • the operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be performed by a spatial precoder calculating component as described with reference to FIGs. 7 through 10.
  • the UE may transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • the operations of 1735 may be performed according to the methods described herein. In some examples, aspects of the operations of 1735 may be performed by an uplink message transmitting component as described with reference to FIGs. 7 through 10.
  • the UE may calculate a spatial precoder based on the first reference signal.
  • the operations of 1825 may be performed according to the methods described herein. In some examples, aspects of the operations of 1825 may be performed by a spatial precoder calculating component as described with reference to FIGs. 7 through 10.
  • the UE may precode information based on the spatial precoder.
  • the operations of 1830 may be performed according to the methods described herein. In some examples, aspects of the operations of 1830 may be performed by a precoding component as described with reference to FIGs. 7 through 10.
  • the UE may transmit, using the uplink control channel resource, an uplink message generated based on the precoded information.
  • the operations of 1835 may be performed according to the methods described herein. In some examples, aspects of the operations of 1835 may be performed by an uplink message transmitting component as described with reference to FIGs. 7 through 10.
  • FIG. 19 shows a flowchart illustrating a method 1900 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the operations of method 1900 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 1900 may be performed by a communications manager as described with reference to FIGs. 11 through 14.
  • a 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, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may identify an association between a reference signal resource and an uplink control channel resource.
  • the operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by an association manager as described with reference to FIGs. 11 through 14.
  • the base station may transmit, to a UE, a first reference signal within the reference signal resource.
  • the operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by a reference signal transmitting component as described with reference to FIGs. 11 through 14.
  • the base station may monitor the uplink control channel resource for an uplink message that includes information precoded based on the first reference signal.
  • the operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by an uplink control channel monitoring component as described with reference to FIGs. 11 through 14.
  • FIG. 20 shows a flowchart illustrating a method 2000 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the operations of method 2000 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 2000 may be performed by a communications manager as described with reference to FIGs. 11 through 14.
  • a 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, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may transmit a downlink message that configures the UE with an uplink control channel resource and indicates that an ID of a reference signal resource is associated with an ID of the uplink control channel resource.
  • the operations of 2005 may be performed according to the methods described herein. In some examples, aspects of the operations of 2005 may be performed by an association manager as described with reference to FIGs. 11 through 14.
  • the base station may identify an association between the reference signal resource and the uplink control channel resource.
  • the operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed by an association manager as described with reference to FIGs. 11 through 14.
  • FIG. 21 shows a flowchart illustrating a method 2100 that supports associating a reference signal with an uplink control channel in accordance with aspects of the present disclosure.
  • the operations of method 2100 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 2100 may be performed by a communications manager as described with reference to FIGs. 11 through 14.
  • a 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, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may transmit, to a UE, a first reference signal within the reference signal resource.
  • the operations of 2115 may be performed according to the methods described herein. In some examples, aspects of the operations of 2115 may be performed by a reference signal transmitting component as described with reference to FIGs. 11 through 14.
  • the base station may identify an association between the reference signal resource and the uplink control channel resource.
  • the operations of 2210 may be performed according to the methods described herein. In some examples, aspects of the operations of 2210 may be performed by an association manager as described with reference to FIGs. 11 through 14.
  • Described below are a number of embodiments of methods, systems, or apparatuses including means for implementing methods or realizing apparatuses, non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement methods, and systems including one or more processors and memory coupled with the one or more processors storing instructions executable by the one or more processors to cause the system or apparatus to implement methods.
  • the embodiments may include device embodiments, such as an antenna, a processor, a UE, or any combination thereof. It is to be understood that these are just some examples of possible embodiments, and other examples will be readily apparent to those skilled in the art without departing from the scope of the disclosure.
  • Embodiment 3 The method of any of embodiments 1 or 2, wherein identifying the association comprises: receiving a downlink message that configures the UE with the uplink control channel resource and indicates that an ID of the reference signal resource is associated with an ID of the uplink control channel resource.
  • Embodiment 4 The method of any of embodiments 1 or 2, wherein identifying the association comprises: receiving a downlink message that triggers or configures the first reference signal and indicates that a reference signal ID for the first reference signal is associated with an ID for the uplink control channel resource.
  • Embodiment 6 The method of embodiment 5, further comprising: determining a slot offset and a QCL relationship for the second reference signal based at least in part on the downlink message; and monitoring for the first reference signal within the reference signal resource based at least in part on the slot offset and the QCL relationship for the second reference signal.
  • Embodiment 7 The method of any of embodiments 5 or 6, wherein the second reference signal is a periodic reference signal.
  • Embodiment 8 The method of any of embodiments 1 or 2, wherein identifying the association comprises: receiving a downlink message that triggers the UE to provide CSI feedback in the uplink message for the first reference signal using the uplink control channel resource, wherein the first reference signal is a periodic reference signal; and identifying that the reference signal resource is associated with the uplink control channel resource based at least in part on the downlink message.
  • Embodiment 11 The method of embodiment 10, further comprising: determining a QCL relationship for a demodulation reference signal of a downlink control channel carrying the downlink message; determining a slot offset based at least in part on the uplink control channel resource; and monitoring for the first reference signal within the reference signal resource based at least in part on the slot offset and the QCL relationship for the demodulation reference signal.
  • Embodiment 12 The method of any of embodiments 1 or 2, wherein identifying the association comprises: receiving a downlink message that triggers the UE to provide CSI feedback within the uplink message for a second reference signal using the uplink control channel resource and indicates the reference signal resource, wherein the second reference signal is different than the first reference signal; and identifying that the reference signal resource is associated with the uplink control channel resource based at least in part on the downlink message.
  • Embodiment 13 The method of embodiment 12, further comprising: determining a slot offset and a QCL relationship for the second reference signal based at least in part on the downlink message; and monitoring for the first reference signal within the reference signal resource based at least in part on the slot offset and the QCL relationship for the second reference signal.
  • Embodiment 14 The method of any of embodiments 1 or 2, wherein identifying the association comprises: receiving a downlink message that triggers the UE to provide CSI feedback for the reference signal resource within the uplink message using the uplink control channel resource; and identifying that the reference signal resource is associated with the uplink control channel resource based at least in part on the downlink message.
  • Embodiment 17 The method of any of embodiments 1 or 2, wherein the association is identified based least in part on the reference signal resource being stored in memory.
  • Embodiment 18 The method of any of embodiments 1 to 17, wherein the first reference signal is a periodic reference signal, an aperiodic reference signal, or a CSI-RS.
  • Embodiment 20 The method of embodiment 19, wherein identifying the association comprises: transmitting a downlink message that configures the UE with the uplink control channel resource and indicates that an ID of the reference signal resource is associated with an ID of the uplink control channel resource.
  • Embodiment 21 The method of embodiment 19, wherein identifying the association comprises: transmitting a downlink message that triggers or configures the first reference signal and indicates that a reference signal ID for the first reference signal is associated with an ID for the uplink control channel resource.
  • Embodiment 25 The method of embodiment 19, wherein identifying the association comprises: transmitting a downlink message that triggers the UE to provide CSI feedback in the uplink message for the first reference signal using the uplink control channel resource, wherein the first reference signal is a periodic reference signal.
  • Embodiment 26 The method of any of embodiments 20 to 25, wherein the downlink message is an RRC message.
  • Embodiment 30 The method of embodiment 29, further comprising: determining a slot offset and a QCL relationship for the second reference signal, wherein the first reference signal is transmitted within the reference signal resource based at least in part on the slot offset and the QCL relationship for the second reference signal.
  • Embodiment 31 The method of embodiment 19, wherein identifying the association comprises: transmitting a downlink message that triggers the UE to provide CSI feedback for the reference signal resource within the uplink message using the uplink control channel resource.
  • Embodiment 32 The method of any of embodiments 27 to 31, wherein downlink message is DCI.
  • Embodiment 33 The method of embodiment 19, wherein the association is identified based least in part on the reference signal resource being a most recently configured or triggered reference signal resource.
  • Embodiment 35 The method of any of embodiments 19 to 34, wherein the first reference signal is a periodic reference signal, an aperiodic reference signal, or a CSI-RS.
  • Embodiment 36 An apparatus for wireless communications comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of embodiments 1 to 18.
  • Embodiment 37 An apparatus for wireless communications comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of embodiments 19 to 35.
  • Embodiment 38 An apparatus comprising at least one means for performing a method of any of embodiments 1 to 18.
  • Embodiment 39 An apparatus comprising at least one means for performing a method of any of embodiments 19 to 35.
  • Embodiment 40 A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to perform a method of any of embodiments 1 to 18.
  • Embodiment 41 A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to perform a method of any of embodiments 19 to 35.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA) , etc.
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases may be commonly referred to as CDMA2000 1X, 1X, etc.
  • IS-856 TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD) , etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • a TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB) , Evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, etc.
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS) .
  • LTE, LTE-A, and LTE-A Pro are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from the organization named “3rd Generation Partnership Project” (3GP
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell may be associated with a lower-powered base station, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed, etc. ) frequency bands as macro cells.
  • Small cells may include pico cells, femto cells, and micro cells according to various examples.
  • a pico cell for example, may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • An eNB for a macro cell may be referred to as a macro eNB.
  • An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells, and may also support communications using one or multiple component carriers.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne des procédés, des systèmes et des dispositifs pour des communications sans fil qui permettent à un équipement utilisateur (UE) de recevoir un signal de référence utilisé pour calculer un précodeur pour un message de liaison montante. Une station de base peut transmettre un message de liaison descendante à l'UE indiquant une relation entre une ressource pour le signal de référence et une ressource pour le message de liaison montante. Dans certains cas, le message de liaison descendante peut être un message de commande de ressource radio ou un message d'informations de commande de liaison descendante qui configure l'UE pour rapporter une rétroaction d'informations d'état de canal ou une autre rétroaction. Le message de liaison descendante peut indiquer que le signal de référence est un signal de référence utilisé pour la rétroaction ou peut indiquer que le signal de référence est un signal de référence supplémentaire. L'UE peut recevoir le signal de référence indiqué, calculer le précodeur, générer le message de liaison montante à l'aide du précodeur, et transmettre le message de liaison montante à la station de base sur la ressource de liaison montante indiquée.
PCT/CN2020/074430 2019-02-20 2020-02-06 Schéma pour associer un signal de référence à un canal de commande de liaison montante WO2020168923A1 (fr)

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