Acknowledgement feedback technology in shared RF spectrum bands

Abstract

Methods, systems, and devices for wireless communications that provide group or one-time acknowledgment (ACK) feedback reports are described, wherein a user equipment (UE) may provide feedback to a base station for several different downlink transmissions. The base station may trigger a one-time feedback report that includes fewer ACK feedbacks than all ACK feedbacks available at the UE for providing in a report. The ACK feedback may include an indication of an ACK or a negative acknowledgment (NACK) together with information related to a data indicator associated with the downlink transmission. In some cases, a regular ACK feedback report and a one-time feedback report may be multiplexed and transmitted by the UE. In addition, the last downlink transmission to be included in the one-time feedback report may be determined based on the reception time of scheduling information or the ACK feedback timeline.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of Indian Provisional Patent Application No. 201941019598, filed by Khoshnevisan et al. on May 16, 2019, entitled “Details of One-Shot HARQ-ACK Transmission in NRU,” and U.S. Patent Application No. 16 / 822,721, filed by Khoshnevisan et al. on March 18, 2020, entitled “Acknowledgment Feedback Techniques in Shared Radio Frequency Spectrum,” each of which is assigned to the assignee of this application. Background Art

[0003] The following relates generally to wireless communications, and more particularly to confirmation feedback techniques in shared radio frequency spectrum bands.

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems that may be referred to as new radio (NR) systems. These systems may use various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each of which simultaneously supports the communication of multiple communication devices, which may be referred to as user equipment (UE).

[0005] Some wireless communication systems may support acknowledgement (ACK) feedback to indicate whether a wireless device (e.g., UE) successfully decoded a downlink message (i.e., a data transmission), where the downlink message decoding is based on one or more detected downlink control messages (e.g., downlink grant or downlink control information (DCI)). In deployments supporting shared or unlicensed radio frequency spectrum bands (e.g., unlicensed NR), one or more downlink messages may not be correctly received (e.g., due to hidden interfering nodes), and the wireless device may not provide ACK feedback based on all downlink control messages. In addition, in some situations, a wireless device (e.g., UE) may not be able to transmit ACK feedback when the medium is occupied by another transmitted ACK feedback (e.g., when a listen-before-talk (LBT) procedure fails). Therefore, techniques to enhance system performance in situations where one or more transmissions cannot be sent or received are desirable. Summary of the invention

[0006] The described techniques relate to improved methods, systems, devices or apparatuses for supporting acknowledgement feedback techniques in shared radio frequency spectrum bands. In various aspects, the described techniques provide group or one-time acknowledgement (ACK) feedback (e.g., hybrid automatic repeat request (HARQ) feedback) reports, wherein a user equipment (UE) may provide feedback to a base station for several different downlink transmissions. In some cases, a base station may trigger a one-time feedback report that includes less ACK feedback than all ACK feedback available for provision in a report at the UE. For example, ACK feedback associated with a specific CC in a component carrier (CC) set may be requested by a base station and transmitted by a UE. In some cases, additionally or alternatively, the ACK feedback may include an indication of ACK, negative acknowledgement (NACK) that may be provided together with information associated with a new data indicator (NDI) associated with a downlink transmission for which feedback is provided. In some cases, additionally or alternatively, conventional feedback reports and one-time feedback reports may be multiplexed by the UE and transmitted to the base station. Furthermore, in some cases, the last downlink transmission to be included in the one-time feedback report may be determined based on the reception time of the scheduling information or the ACK feedback timeline.It should be noted that various elements as detailed below may be combined between the independent claims described herein.

[0007] A method for wireless communication at a UE is described. The method may include: determining HARQ feedback for a set of downlink transmissions from a base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data; receiving downlink control information from the base station, the downlink control information indicating that the UE will provide a one-time feedback report for at least the subset of downlink transmissions; identifying associated HARQ feedback for each downlink transmission in at least the subset of downlink transmissions, the associated HARQ feedback including an ACK / NACK indication and the associated data indicator, wherein in the absence of scheduling information for a HARQ process identifier for one or more downlink transmissions, a default data indicator is identified as the associated data indicator for the one or more downlink transmissions; and transmitting to the base station the one-time feedback report including the HARQ feedback for at least the subset of downlink transmissions.

[0008] A device for wireless communication at a UE is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor so that the device: determines HARQ feedback for a set of downlink transmissions from a base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data; receives downlink control information from the base station, the downlink control information indicating that the UE will provide a one-time feedback report for at least the downlink transmission subset; identifies associated HARQ feedback for each downlink transmission in at least the downlink transmission subset, the associated HARQ feedback including an ACK / NACK indication and the associated data indicator, wherein in the absence of scheduling information for a HARQ process identifier for one or more downlink transmissions, a default data indicator is identified as the associated data indicator for the one or more downlink transmissions; and transmits the one-time feedback report including the HARQ feedback for at least the downlink transmission subset to the base station.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include means for: determining HARQ feedback for a set of downlink transmissions from a base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission comprises an initial transmission of downlink data or a retransmission of previously transmitted downlink data; receiving downlink control information from the base station, the downlink control information indicating that the UE will provide a one-time feedback report for at least the subset of downlink transmissions; identifying associated HARQ feedback for each downlink transmission in at least the subset of downlink transmissions, the associated HARQ feedback comprising an ACK / NACK indication and the associated data indicator, wherein in the absence of scheduling information for a HARQ process identifier for one or more downlink transmissions, a default data indicator is identified as the associated data indicator for the one or more downlink transmissions; and transmitting to the base station the one-time feedback report including the HARQ feedback for at least the subset of downlink transmissions.

[0010] 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 for the following operations: determining HARQ feedback for a set of downlink transmissions from a base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data; receiving downlink control information from the base station, the downlink control information indicating that the UE will provide a one-time feedback report for at least the subset of downlink transmissions; identifying associated HARQ feedback for each downlink transmission in at least the subset of downlink transmissions, the associated HARQ feedback including an ACK / NACK indication and the associated data indicator, wherein in the absence of scheduling information for a HARQ process identifier for one or more downlink transmissions, a default data indicator is identified as the associated data indicator for the one or more downlink transmissions; and transmitting the one-time feedback report including the HARQ feedback for at least the subset of downlink transmissions to the base station.

[0011] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the transmission may include operations, features, devices, or instructions for the following actions: transmitting only the one-time feedback report to the base station together with the uplink transmission. In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the one-time feedback report includes one or more of an acknowledgment (ACK) indication, a negative acknowledgment (NACK) indication, the data indicator, or a combination thereof, each of which may be associated with a corresponding HARQ process identifier (ID) for a downlink transmission in the downlink transmission set. In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the data indicator may be a new data indicator (NDI), which is included in the one-time feedback report based on a configuration to include the NDI information with the HARQ feedback.

[0012] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the downlink transmission set includes a group of downlink transmissions, each downlink transmission being associated with a different HARQ process identifier.

[0013] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the one-time feedback report provides HARQ feedback for each HARQ process ID in a set of HARQ process IDs, and wherein the HARQ feedback is associated with one or more of a set of transport blocks, a set of component carriers, a set of code block groups, or any combination thereof.

[0014] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, identifying the associated HARQ feedback may include operations, features, means, or instructions for the following actions: identifying a codebook associated with the acknowledgment feedback identified for a set of feedback processes to be reported in the one-time feedback report. In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the latest downlink transmission in the downlink transmission set to be included in the one-time feedback report may be determined based on the timing of the downlink control information that schedules the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof.

[0015] A method for wireless communication at a base station is described. The method may include: configuring a UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data, and wherein the HARQ feedback indicates an acknowledgement / negative acknowledgement and the data indicator for each of the one or more downlink transmissions; transmitting a set of downlink transmissions to the UE; transmitting downlink control information to the UE, the downlink control information indicating that the UE will provide a one-time feedback report for at least the one or more downlink transmissions; and receiving from the UE the one-time feedback report indicating HARQ feedback for each of the one or more downlink transmissions, wherein in the absence of scheduling information for a HARQ process identifier for the one or more downlink transmissions, a default data indicator is included with the HARQ feedback for the one or more downlink transmissions.

[0016] A device for wireless communication at a base station is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor so that the device: configures a UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data, and wherein the HARQ feedback indicates an acknowledgement / negative acknowledgement and the data indicator for each downlink transmission in the one or more downlink transmissions; transmits a downlink transmission set to the UE; transmits downlink control information to the UE, the downlink control information indicating that the UE will provide a one-time feedback report for at least the one or more downlink transmissions; and receives from the UE the one-time feedback report indicating HARQ feedback for each downlink transmission in the one or more downlink transmissions, wherein in the absence of scheduling information for a HARQ process identifier for the one or more downlink transmissions, a default data indicator is included with the HARQ feedback for the one or more downlink transmissions.

[0017] Another apparatus for wireless communication at a base station is described. The apparatus may include means for: configuring a UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data, and wherein the HARQ feedback indicates an acknowledgement / negative acknowledgement and the data indicator for each of the one or more downlink transmissions; transmitting a set of downlink transmissions to the UE; transmitting downlink control information to the UE, the downlink control information indicating that the UE will provide a one-time feedback report for at least the one or more downlink transmissions; and receiving from the UE the one-time feedback report indicating HARQ feedback for each of the one or more downlink transmissions, wherein in the absence of scheduling information for a HARQ process identifier for the one or more downlink transmissions, a default data indicator is included with the HARQ feedback for the one or more downlink transmissions.

[0018] 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 for the following operations: configuring a UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data, and wherein the HARQ feedback indicates an acknowledgement / negative acknowledgement and the data indicator for each of the one or more downlink transmissions; transmitting a set of downlink transmissions to the UE; transmitting downlink control information to the UE, the downlink control information indicating that the UE will provide a one-time feedback report for at least the one or more downlink transmissions; and receiving from the UE the one-time feedback report indicating HARQ feedback for each of the one or more downlink transmissions, wherein in the absence of scheduling information for a HARQ process identifier for the one or more downlink transmissions, a default data indicator is included with the HARQ feedback for the one or more downlink transmissions.

[0019] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the one-time feedback report may be transmitted together with the uplink transmission of the UE, and wherein only the one-time feedback report is provided together with the uplink transmission, regardless of whether the HARQ reporting timeline of one or more other types of HARQ feedback corresponds to the timing of the uplink transmission. In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the one-time feedback report includes one or more of an acknowledgment (ACK) indication, a negative acknowledgment (NACK) indication, the data indicator, or a combination thereof, each of which may be associated with a corresponding HARQ process identifier (ID) for a downlink transmission in the downlink transmission set. In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the data indicator may be a new data indicator (NDI).

[0020] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the downlink transmission set includes a group of downlink transmissions, each of which can be associated with a different HARQ process ID. In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the one-time feedback report provides HARQ feedback for each HARQ process ID in a group of HARQ process IDs, and wherein the HARQ feedback is associated with one or more of a group of transport blocks, a group of component carriers, a group of code block groups, or any combination thereof.

[0021] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the default data indicator may be reported by the UE for a first feedback process identifier for which the UE has not yet received scheduling information, the scheduling information indicating that the first feedback process identifier is to be used to indicate feedback for one of the downlink transmission subsets. In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, when scheduling information indicating the first feedback process identifier has not yet been transmitted to the UE, the default data indicator may be used as a frozen bit at a polarity decoder to assist in decoding the feedback report.

[0022] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the latest downlink transmission in the downlink transmission set to be included in the one-time feedback report may be determined based on the timing of the downlink control information scheduling the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 An example of a wireless communication system supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is illustrated.

[0025] Figure 2 An example of a portion of a wireless communication system supporting acknowledgement feedback techniques in a shared radio frequency spectrum band in accordance with various aspects of the present disclosure is illustrated.

[0026] Figure 3 An example of an ACK feedback timeline supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is illustrated.

[0027] Figure 4 Examples of feedback information supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure are explained.

[0028] Figure 5 Examples of multiplexed feedback reporting that support acknowledgement feedback techniques in a shared radio frequency spectrum band in accordance with various aspects of the present disclosure are illustrated.

[0029] Figure 6 Examples of feedback timing supporting acknowledgement feedback techniques in a shared radio frequency spectrum band in accordance with various aspects of the present disclosure are illustrated.

[0030] Figure 7 Examples of feedback timing supporting acknowledgement feedback techniques in a shared radio frequency spectrum band in accordance with various aspects of the present disclosure are illustrated.

[0031] Figure 8 and 9 A block diagram of a device supporting acknowledgement feedback technology in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown.

[0032] Fig.10 A block diagram of a communication manager supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown.

[0033] Fig.11 A diagram of a system including devices supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown.

[0034] Fig.12 and 13 A block diagram of a device supporting acknowledgement feedback technology in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown.

[0035] Fig.14 A block diagram of a communication manager supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown.

[0036] Fig.15A diagram of a system including devices supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown.

[0037] Figures 16 to 23 A flow chart illustrating a method for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown.

[0038] Detailed Description

[0039] Various aspects described in the present disclosure relate to improved methods, systems, devices or apparatuses that facilitate feedback for transmission or retransmission (such as hybrid automatic repeat request (HARQ) acknowledgement / negative acknowledgement (ACK / NACK) feedback reporting). In some examples, the techniques described herein enable efficient group or one-time HARQ feedback reporting in a wireless communication system, where a user equipment (UE) can provide feedback to a base station for several different downlink transmissions.

[0040] In some cases, the wireless communication system may further support communications in an unlicensed spectrum (e.g., a shared radio frequency spectrum band), a licensed spectrum, or a combination of licensed and unlicensed spectrum. In such a system, one or more transmissions may not be successfully received due to interference from a hidden node, or may not be transmitted due to a LBT failure. Accordingly, the HARQ feedback may not include feedback for one or more lost HARQ process IDs (e.g., due to interference, LBT failure, etc.). In such a case, a one-time or group HARQ feedback report may be used, which allows the UE to transmit feedback for all HARQ processes configured at the UE. The base station may trigger a one-time HARQ feedback in a downlink message (e.g., a downlink or uplink grant), in a separate downlink message (e.g., a separate DCI), or in a group common DCI provided to several UEs. If the HARQ feedback for a specific HARQ process ID is ready when the trigger is received, the UE may transmit appropriate HARQ feedback based on the decoding result. Alternatively, if HARQ feedback for a particular HARQ process ID is not ready (eg, based on an associated feedback timeline) when a trigger is received, the UE may transmit a previous value or a default value (eg, NACK) for that particular HARQ process.

[0041] In some cases, a base station may trigger a one-time feedback report that includes fewer HARQ feedback subsets than all HARQ feedback available at the UE for provision in a report. For example, HARQ feedback associated with a specific CC in a component carrier (CC) set may be requested by the base station and transmitted by the UE. In some cases, the HARQ feedback subset may be associated with a transport block, one or more HARQ process IDs, one or more code block groups (CBGs), a specific new data indicator (NDI) state, one or more CCs, or a combination thereof. The base station may indicate the HARQ feedback subset in a downlink control information (DCI) that is transmitted to trigger the UE to transmit a one-time feedback. In some cases, the signaling in the DCI may be explicit (e.g., in one or more DCI information fields) or may be implicit (e.g., based on the CC transmitting the DCI or the CC scheduled by the DCI). By reducing the amount of data transmitted in such a one-time HARQ feedback report (e.g., HARQ feedback only for CCs that receive interference or fail the LBT procedure), such techniques may allow for more efficient use of resources.

[0042] In some cases, HARQ feedback may include an indication of an ACK or NACK, which may be provided together with information related to the NDI associated with the downlink transmission for which feedback is provided. In some cases, for a specific HARQ ID, a tri-state indication may be used to indicate an ACK for a first NDI, an ACK for a second NDI, or a NACK. In some cases, the base station may configure one or more codebooks that provide bit sequences for different combinations of feedback indications for each HARQ ID. Such tri-state indications may allow overhead to be reduced by transmitting fewer bits. In addition, by providing an indication of the NDI associated with the feedback information, ambiguity that may be caused by the UE not receiving scheduling information that may indicate a different NDI can be reduced.

[0043] In some cases, regular feedback reports and group one-time feedback reports may be multiplexed by the UE and transmitted to the base station. In some cases, regularly scheduled feedback may be provided (e.g., based on predefined uplink control information resources associated with scheduled downlink transmissions to the UE), which may be concatenated with the one-time report. In some cases, one or more downlink transmissions may have HARQ feedback reported in both reports (e.g., one HARQ ID may be reported in each feedback report). Such techniques may provide certainty regarding the size and content of each HARQ feedback report.

[0044] In addition, in some cases, the last downlink transmission to be included in the one-time feedback report can be determined based on the reception time of the scheduling information or the HARQ feedback timeline. For example, if a first downlink transmission with an associated first HARQ ID is transmitted before the feedback timeline based on the processing time before the transmission of the HARQ report, it will be included in the HARQ report, and if a second downlink transmission with an associated second HARQ ID is transmitted after the feedback timeline, it will not be included in the HARQ report. Such a timeline-based determination for including feedback information in a feedback report can provide defined rules for including specific HARQ feedback in a feedback report and can reduce ambiguity in the expected information in such a report. It should be noted that the various techniques detailed herein can be implemented in conjunction with other disclosed techniques or independently of other described techniques.

[0045] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Additional aspects of the present disclosure are then described with respect to a group or one-time ACK feedback scheme. Various aspects of the present disclosure are further explained and described with reference to apparatus diagrams, system diagrams, and flow charts related to ACK feedback techniques in a shared radio frequency spectrum band.

[0046] Figure 1 An example of a wireless communication system 100 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is illustrated. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication 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.

[0047] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home Evolved Node B, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein may be able to communicate with various types of base stations 105 and network equipment (including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.).

[0048] Each base station 105 may be associated with a particular geographic coverage area 110 in which it supports communications with various UEs 115. Each base station 105 may provide communications coverage for a corresponding geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0049] The geographic coverage area 110 of the base station 105 may be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector may be associated with a cellular cell. For example, each base station 105 may provide communication coverage for a macrocellular cell, a small cellular cell, a hotspot, or other types of cellular cells, or various combinations thereof. In some examples, the base station 105 may be mobile and therefore provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and the overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or different base stations 105. The wireless communication 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.

[0050] The term "cell" refers to a logical communication entity used to communicate with base station 105 (e.g., on a carrier), and may be associated with an identifier to distinguish adjacent cells operating via the same or different carriers (e.g., physical cell identifier (PCID), virtual cell identifier (VCID)). In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or others). In some cases, the term "cell" may refer to a portion (e.g., a sector) of a geographic coverage area 110 on which the logical entity operates.

[0051] Each UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can 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 term, wherein "device" can also be referred to as a unit, a station, a terminal, or a client. UE 115 can 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. In some examples, UE 115 can 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, etc., which can be implemented in various items (such as electrical appliances, vehicles, meters, etc.).

[0052] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay the information to a central server or application, which may utilize the information or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0053] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating over a limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0054] In some cases, UE 115 may also be able to communicate directly with other UE 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more UEs in a group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in this group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some cases, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between each UE 115 without involving the base station 105.

[0055] The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link 132 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) on a backhaul link 134 (e.g., via X2, Xn, or other interfaces).

[0056] 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 layer (e.g., control plane) functions such as mobility, authentication, and bearer management of UEs 115 served by base stations 105 associated with the EPC. User IP packets may be delivered through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet switched (PS) streaming services.

[0057] At least some network devices (such as base stations 105) may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with each UE 115 through a number of other access network transport entities, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). In some configurations, the 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 merged into a single network device (e.g., base station 105).

[0058] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths are in the range of from about 1 decimeter to 1 meter long. UHF waves can be blocked or redirected by buildings and environmental features. However, these waves can penetrate various structures sufficiently for macro cells to provide services to UEs 115 located indoors. Transmission of UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km) compared to transmission using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

[0059] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as centimeter bands. The SHF region includes frequency bands that may be opportunistically used by devices that may be able to tolerate interference from other users, such as the 5 GHz Industrial, Scientific, and Medical (ISM) band.

[0060] The wireless communication system 100 may also operate in the extremely high frequency (EHF) division of the spectrum (e.g., from 30 GHz to 300 GHz), which is also referred to as the millimeter band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antenna of the corresponding device may be even smaller and more closely spaced than the UHF antenna. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency divisions, and the use of frequency bands specified across these frequency divisions may differ by country or regulatory agency.

[0061] In some cases, the wireless communication system 100 may utilize both licensed and unlicensed or shared radio frequency spectrum bands. For example, the wireless communication system 100 may adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (NR-U) (such as a 5GHz ISM band). When operating in an unlicensed or shared radio frequency spectrum band, wireless devices (such as base stations 105 and UE 115) may adopt a listen-before-talk (LBT) procedure to ensure that the frequency channel is clear before transmitting data. In some cases, operations in unlicensed bands can be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed bands. 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 the two.

[0062] In some examples, the base station 105 or the 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) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., the base station 105) and a receiving device (e.g., the UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. Each of these 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 for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0063] 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 direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying a particular amplitude and phase shift to the signal carried via each antenna element associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0064] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different transmission directions. The transmissions in different beam directions may be used (e.g., by the base station 105 or a receiving device, such as the UE 115) to identify the beam direction used by the base station 105 for subsequent transmission and / or reception.

[0065] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array having several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0066] In some cases, the wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on a logical channel. The media access control (MAC) layer may perform priority handling and multiplex logical channels into transport channels. The MAC layer may also use a hybrid automatic repeat request (HARQ) to provide retransmission of the MAC layer, thereby improving link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration and maintenance of an RRC connection for a radio bearer that supports user plane data between UE115 and base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0067] The time interval in LTE or NR can be represented by a basic time unit (which may refer to a sampling period T, for example). s =1 / 30,720,000 seconds). The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be expressed as T f =307,200T s . A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. 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 slot 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 a cyclic prefix prepended to each symbol period). Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0068] In some wireless communication systems, a time slot may be further divided into a plurality of mini-slots containing one or more symbols. In some instances, a symbol of a mini-slot or a mini-slot may be the minimum scheduling unit. For example, each symbol may vary in duration depending on the subcarrier spacing or the operating frequency band. Further, some wireless communication systems may implement time slot aggregation, wherein a plurality of time slots or mini-slots are aggregated together and used for communication between UE 115 and base station 105.

[0069] The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications on the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band that operates according to a physical layer channel 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 predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by a UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink communications and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may include multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0070] For different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR), the organizational structure of the carrier can be different. For example, the communication on the carrier can be organized according to TTIs or time slots, each of which can include user data and control information or signaling to support decoding of the user data. The carrier can also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate the operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0071] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. In some examples, control information transmitted in a physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or a common search space and one or more UE-specific control regions or UE-specific search spaces).

[0072] A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0073] In a system using MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate of communication with UE 115.

[0074] A device (e.g., base station 105 or UE 115) of wireless communication system 100 may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, wireless communication system 100 may include base stations 105 and / or UEs 115 that support simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0075] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, a feature that may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

[0076] In some cases, UE 115 and base station 105 may support retransmission of data to increase the possibility of data being successfully received. HARQ feedback such as discussed herein is a technique to increase the possibility of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput of the MAC layer in poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback for data received in a previous symbol in the slot in a specific slot. In other cases, the device may provide HARQ feedback in a subsequent slot or according to some other time interval. In some cases, a one-time HARQ feedback may be enabled, wherein the base station 105 may trigger a one-time HARQ report to prompt UE 115 to transmit HARQ feedback for each of its configured HARQ process IDs. Various techniques described herein enable efficient group or one-time HARQ feedback reporting, where a UE 115 can provide feedback to a base station 105 for several different downlink transmissions.

[0077] Figure 2 An example of a wireless communication system 200 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 may include a base station 105-a and a UE 115-a, which may be as described with reference to Figure 1 Examples of corresponding base stations 105 and UEs 115 are described.

[0078] As described herein, a base station 105-a and a UE 115-a may communicate in an unlicensed spectrum (e.g., a shared radio frequency spectrum band), and HARQ feedback techniques may be employed to indicate whether data has been correctly received at the UE 115a. For example, the base station 105-a may transmit one or more downlink messages to the UE 115-a on the resources of the carrier 205. Accordingly, the UE 115-a may transmit an indication of whether one or more downlink messages are correctly received and decoded on the resources of the carrier 210. In some cases, carriers 205 and 210 may be the same carrier. In some cases, carriers 205 and 210 may be component carriers (CCs), and several different CCs may be used for communication between the UE 115-a and the base station 105-a. In this example, the base station 105-a may transmit a one-time HARQ feedback trigger 215 on the carrier 205, and the UE 115-a responds with a feedback report 220 on the carrier 210. The one-time HARQ feedback trigger 215 may be included in a downlink or uplink grant (e.g., a downlink message such as the PDCCH), or the UE 115-a may be explicitly triggered to transmit the feedback report 220 (e.g., in a separate DCI message).

[0079] When there is a one-time HARQ feedback trigger 215, the base station 105-a may instruct the UE 115-a to provide a feedback report 220 based on one or more configured HARQ processes of the UE 115-a. For example, the base station 105-a may configure the UE 115-a to have eight HARQ process IDs, and each transport block (TB) transmitted by the base station 105-a may have an associated HARQ ID. The UE 115-a may use the indicated HARQ ID to provide feedback to the base station 105-a indicating whether the associated TB was successfully received or not successfully received. In some cases, the scheduling information for the downlink transmission may also include an NDI associated with the downlink transmission (e.g., a scheduled TB), which may indicate whether the transmission is an initial transmission of data for the TB or a retransmission of data for the TB (which may then be used in a soft combining technique).

[0080] The feedback report 220 may indicate HARQ feedback for all or a subset of the configured HARQ processes of the UE 115-a. In some cases, the feedback information for each HARQ ID may include a corresponding code block group (CBG) or TB-level ACK bit based on its configuration. In some cases, the UE 115-a may be explicitly triggered by a one-time HARQ feedback trigger 215 for the feedback report 220 together with an indication of a specific transmission time interval (e.g., time slot, codeword, etc.) for transmitting the feedback report 220. The UE 115-a may fill in the fields for the feedback report 220 based on the decoding result of the corresponding HARQ process (e.g., ACK if successfully decoded, NACK if not successfully received / decoded). In some cases, the UE 115-a may fill in the corresponding fields of the feedback report 220 with the previous value of the HARQ process or with a default value (e.g., ACK, NACK, NDI, or any combination thereof). Accordingly, the base station 105-a can interpret whether each field of each HARQ process is based on the decoding result, the previous value or the default value. Figures 3 to 7 Discussed in more detail, in various examples, the feedback report 220 may include HARQ feedback for one or more subsets of the HARQ information, which feedback report 220 may be multiplexed with one or more other reports based on a timeline associated with scheduling and transmission reports, may indicate feedback and an associated NDI, may include HARQ feedback for a HARQ ID, or any combination thereof.

[0081] Figure 3 An example of an ACK feedback timeline 300 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is illustrated. In some examples, the ACK feedback timeline 300 can implement aspects of the wireless communication system 100 or 200. In this example, a UE (e.g., Figure 1 or UE 115 of 2) and a base station (e.g., Figure 1 A base station 105 of 102 or 2 may establish multiple CCs for downlink transmission, uplink transmission, or both. Figure 3 In the example of , a first CC 305 and a second CC 310 may be configured.

[0082] The base station may transmit a first subset 315 of downlink transmissions via the first CC 305, and the UE may attempt to receive and decode the first subset 315. In this example, the UE may configure eight HARQ processes, which have HARQ IDs 0 to 7. In addition, the scheduling information provided for the downlink transmissions may include an NDI for each transmission, which the UE may use when decoding the associated transmissions. In this example, downlink transmissions (e.g., TBs) associated with HARQ IDs 0 to 3, each having an NDI of 0, may be scheduled as the first subset 315 of downlink transmissions. In addition, a second subset 325 of downlink transmissions may be scheduled for HARQ IDs 0 to 3, each having an NDI of 1. Similarly, on the second CC 310, a third subset 335 of downlink transmissions may have HARQ IDs 4 to 7, each having an NDI of 0, and a fourth subset 345 of downlink transmissions may have HARQ IDs 4 to 7, each having an NDI of 0. It should be noted that this example is provided for purposes of discussion and illustration, and that numerous different examples of downlink transmissions may be used to implement the techniques discussed herein.

[0083] In some cases, the UE may be configured to provide HARQ feedback 320 associated with the first subset 315 of downlink transmissions using uplink resources predetermined or provided in scheduling information associated with the first subset 315 of downlink transmissions. In this example, the UE may fail to successfully transmit the HARQ feedback 320, for example, due to failed LBT or interference from another transmitter. In this example, the base station may provide a one-time HARQ trigger 330 to the UE to trigger a one-time group HARQ feedback report 350. The UE may also be configured to provide HARQ feedback 340 and 355 for a third subset 335 of downlink transmissions and a fourth subset 345 of downlink transmissions, respectively. The base station may transmit the one-time HARQ trigger 330, which in this example may trigger the UE to transmit the group HARQ feedback report 350.

[0084] In some cases, the one-time HARQ trigger 330 may indicate that the UE is to transmit a single HARQ message for each configured HARQ process ID (e.g., Figure 3In the example of , the UE may provide HARQ feedback for HARQ IDs 0 to 7). In addition, since different transmissions may have different NDIs, the UE may also provide an indication of which NDI each feedback indication is associated with. In the case where the group HARQ feedback report 350 includes all such information, the size of the report may become relatively large (for example, 5 CCs may be configured, each with 16 HARQ IDs, which may correspond to 2 TBs, resulting in a payload size of 5*16*2 bits for A / N bits and 5*16*2 bits for NDI, and CBG-based feedback may further increase the payload). In addition, in some cases, such as in Figure 3 In the example of , only a subset of transmissions may have missing feedback, such as feedback from the HARQ feedback report 320 associated with the first subset 315 of downlink transmissions. In such a case, the one-time HARQ trigger 330 may indicate a subset of HARQ information to be reported in the group HARQ feedback report 350.

[0085] In some cases, one or more fields may be included in the DCI including the one-time HARQ trigger 330, which may indicate that a specific HARQ feedback subset is to be reported by the UE. In addition, in some cases, the downlink assignment indicator (DAI) field in the DCI may be reused to provide an indication of one or more HARQ feedback subsets to be reported. Since the DAI field is used to indicate regular feedback resources rather than one-time feedback information, such a DAI field may be reused for a one-time trigger, and thus the DCI containing the one-time HARQ trigger 330 may reuse the field. In some examples, the DCI may indicate a request for all CCs or a subset of CCs, which may be explicitly indicated in the DCI or implicit. In the case where the requested CC is implicit, the subset of CCs to be reported may be based on, for example, a scheduling CC (e.g., only requesting HARQ feedback for the CC on which the DCI is detected) or a scheduled CC (e.g., only requesting HARQ feedback for the scheduled cell, in which case the DCI requesting the one-time HARQ feedback may also schedule PDSCH in a CC different from the CC carrying the DCI). In addition, for a given CC or all CCs, the DCI may indicate a request for all configured HARQ IDs or a subset thereof (e.g., the DCI may indicate all configured HARQ IDs or the first half of the configured HARQ IDs via a one-bit indication in the DCI). In some cases, requesting only the first half of the configured HARQ IDs may be desirable because the base station may rarely use the second half of the HARQ ID, or the base station may know that no HARQ IDs in the second half of the HARQ ID have been used for a particular CC. Additionally, in some cases, the DCI may indicate whether an indication of NDI is to be included with the HARQ feedback, and the UE may use a codebook to determine the HARQ feedback based on whether the NDI is to be indicated. Reference Figure 4 Additional details related to the NDI indication are discussed. In addition, in some cases, the DCI may indicate whether to include CBG-based HARQ feedback, which may apply to all CCs or HARQ IDs, or may be controlled separately for a group of CCs or HARQ IDs. In some cases, the base station may configure the UE (e.g., during RRC connection establishment or re-establishment) which type of information may be requested for a one-time HARQ feedback report.

[0086] Figure 4 An example of feedback information 400 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is illustrated. In some examples, the feedback information 400 can implement aspects of the wireless communication system 100 or 200. In this example, a UE (e.g., Figure 1 or UE 115 of 2) and a base station (e.g., Figure 1A base station 105 of 102 or 2 may establish multiple CCs for downlink transmission, uplink transmission, or both. Figure 4 In the example of FIG. 4 , a first CC 405 is illustrated, with the understanding that one or more other CCs may exist.

[0087] The base station may transmit a first subset 415 of downlink transmissions via the first CC 405, and the UE may attempt to receive and decode the first subset 415. In this example, the UE may configure eight HARQ processes with HARQ IDs 0 to 7. In addition, the scheduling information provided for the downlink transmissions may include an NDI for each transmission, which the UE may use when decoding the associated transmissions. In this example, downlink transmissions (e.g., TBs) associated with HARQ IDs 0 to 3, each having an NDI of 0, may be scheduled as the first subset 415 of downlink transmissions. In addition, a second subset 425 of downlink transmissions may be scheduled for HARQ IDs 4, 5, and 6, each having an NDI of 0, and for HARQ ID 1 having an NDI of 1. In this example, the HARQ feedback 420 may not be successfully transmitted (e.g., due to LBT failure) or received (e.g., due to interference), and the base station may transmit a one-time HARQ trigger 430 to trigger a group HARQ feedback report 450. As discussed herein, group HARQ feedback reporting 450 may be triggered for a subset of downlink transmissions.

[0088] In this example, the group HARQ feedback report 450 may include HARQ feedback information for each configured HARQ ID (HARQ IDs 0 to 7 in this example). Additionally, in this example, the group HARQ feedback report 450 may be configured to include NDI information associated with the HARQ ID in order to reduce ambiguity associated with HARQ feedback. For example, HARQ ID 1 in this scenario has an NDI of 0 and an NDI of 1 for different downlink transmissions. Thus, if an ACK is reported for HARQ ID 1, there may be ambiguity as to which NDI the ACK is associated with. Additionally, if any of the HARQ ID 1 transmissions were not successfully received, a single NACK may indicate that a retransmission is required because the base station may assume that the NACK is for the latest NDI.

[0089] In this example, NDI compression can be achieved through a three-state indicator. Therefore, instead of 2 bits per HARQ ID per TB (i.e., one bit for ACK / NNACK plus one bit for NDI), a three-state feedback indication can be provided indicating NACK, ACK with NDI=0, or ACK with NDI=1. Such a three-state indication can reduce the payload size of the feedback report. For example, if 16 HARQ IDs are configured, this will result in 26 bits being required to report the HARQ feedback (i.e., log2(3 16 )=26 bits), rather than the 32 bits required for a 4-bit indicator. In some cases, a codebook may be configured to provide a bit sequence for different combinations of feedback for a configured number of HARQ IDs, and the UE may select a 26-bit HARQ feedback based on a mapping between the indicator for each HARQ ID and a bit sequence from the codebook.

[0090] In addition, in some cases, the UE may not be scheduled for transmission of a particular HARQ ID, and in such cases, the one-time feedback report may include a default value of the NDI associated with such HARQ ID (e.g., NDI=0) together with an ACK / NACK bit (e.g., indicating NACK). In such cases, if such HARQ ID has been scheduled, the base station may receive the NACK and determine that the scheduling information and / or transmission has not been successfully received, and if such HARQ ID has not been scheduled, the base station may know the value of the particular bit in the feedback report. In some cases, if a particular HARQ process has not been used, the base station may use this known bit value to assist in decoding (e.g., frozen bits may be provided to a polarity decoder to help improve the performance and efficiency of decoding feedback reports). In addition, in some cases, a default value of the NDI may also be used at the base station, and when the base station schedules the HARQ ID for the first time, a default NDI (e.g., NDI=0) may be used. In this case, regardless of whether the UE receives a grant, the NDI value for that HARQ process in the one-time report is known and can be used by the base station to assist in decoding (eg, by providing frozen bits to a polarity decoder).

[0091] Figure 5 An example of a multiplexed feedback report 500 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is illustrated. In some examples, the multiplexed feedback report 500 can implement aspects of the wireless communication system 100 or 200. In this example, a UE (e.g., Figure 1 or UE 115 of 2) and a base station (e.g., Figure 1 A base station 105 of 102 or 2 may establish multiple CCs for downlink transmission, uplink transmission, or both. Figure 5In the example of , a first CC 505 and a second CC 510 may be configured.

[0092] The base station may transmit a downlink transmission via the first CC 505, and the UE may attempt to receive and decode the downlink transmission. In this example, the UE may configure eight HARQ processes with HARQ IDs 1 to 8. In addition, the scheduling information for a physical downlink shared channel (PDSCH) transmission 545 provided in the DCI 540 may include DAI information (e.g., counter DAI (cDAI) and total DAI (tDAI)), which (e.g., together with control channel monitoring opportunity information) may be used to determine a codebook for providing HARQ feedback 515. The DCI 540 may also provide a HARQ ID and an NDI indicator for the scheduled PDSCH transmission 545.

[0093] In this example, the UE may not be able to successfully transmit the HARQ feedback 520, for example, due to a failed LBT or interference from another transmitter. In this example, the base station may provide the UE with a DCI with a one-time HARQ trigger 535 to trigger a one-time group HARQ feedback report 550. In this example, the UE may also be configured to transmit a regular HARQ feedback report, which may be multiplexed with the one-time HARQ feedback report in the multiplexed group HARQ feedback report 520. In this example, the first portion 525 of the multiplexed group HARQ feedback report 520 may include information that would normally be transmitted based on the HARQ configuration of the UE, and may include a second portion 530 with the one-time HARQ report. In this example, the first portion 525 includes ACK / NACK information for downlink transmissions based on a configured HARQ report and timeline (e.g., a conventional type 1 or type 2 HARQ codebook based on cDAI, tDAI, control channel monitoring opportunities, etc.), and the one-time HARQ report in the second portion 530 may include feedback information for each configured HARQ ID (i.e., HARQ IDs 1 to 8), which may include one or more repeated HARQ indications for one or more HARQ IDs.

[0094] In some cases, the regular HARQ codebook and the one-time HARQ report codebook may be multiplexed together (e.g., the one-time codebook is placed at the end of the regular codebook). In some cases, the first part 525 and the second part 530 may be concatenated before encoding the payload (i.e., payload concatenation) or concatenated after encoding (e.g., the two codebooks are encoded separately and then multiplexed). In addition, in some cases, the regular codebook of part 1 525 may be CBG-based or may span multiple CCs, while the one-time codebook of part 2 530 may correspond to only one CC (e.g., a CC explicitly requested in the DCI or a CC requested based on a scheduling CC / scheduled CC, as shown in reference to Figure 3 discussed) and can be TB-based. Note that Figure 5 In the example of , feedback information of HARQ IDs 2, 4, 6, 8 is reported in both the first part 525 and the second part 530. In addition, in this example, for HARQ ID 2, NACK is reported in the dynamic codebook of the first part 525 (because the DCI is lost), and feedback of the previous NDI is reported in the one-time codebook.

[0095] Alternatively, in some cases, when conventional HARQ feedback is multiplexed with one-time HARQ feedback, the UE may discard the conventional HARQ feedback codebook and report only the one-time HARQ report. In some cases, when the HARQ ID involved in conventional HARQ is completely covered by the one-time HARQ report (such as when the one-time HARQ triggers the report of all HARQ IDs of all CCs), the base station may configure this option. In other cases, conventional HARQ feedback and one-time HARQ reports may be reported together, but in separate resources rather than using payload concatenation. In such cases, additional resources may be configured for the one-time HARQ report. For example, a PUCCH resource indicator (PRI) may be linked to conventional HARQ feedback and one-time HARQ reports. In such cases, when a one-time HARQ report is triggered in addition to conventional HARQ feedback, the PRI in the DCI may point to a resource pair for conventional HARQ feedback and one-time HARQ feedback. Similarly, the feedback delay value K1 may point to a pair of timelines for regular HARQ feedback and one-time HARQ feedback, and a set of resource pairs and K1 pairs may be preconfigured (e.g., via RRC). In such a case, when both regular and one-time HARQ feedback are triggered, PRI and K1 point to an entry in the set that defines a resource / K1 pair, and when only regular or one-time HARQ feedback is triggered, PRI and K1 point to an entry in the set that does not have a resource / K1 pair defined.

[0096] Figure 6An example of feedback timing 600 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is illustrated. In some examples, feedback timing 600 can implement aspects of wireless communication systems 100 or 200. In this example, a UE (e.g., Figure 1 or UE 115 of 2) and a base station (e.g., Figure 1 6 and 7. In the example, the UE may transmit a first PUCCH 605, a second PUCCH 610, and a third PUCCH 615, and the base station may transmit a first PDSCH 625 transmission for HARQ IDs 1 to 4 and a second PDSCH 630 transmission for HARQ IDs 5 and 6.

[0097] For regular HARQ transmissions, the value of K1 may be used to indicate the time (in timeslots) between PDSCH to HARQ, which in this example is indicated as feedback timeline 620. Thus, in this case, HARQ IDs 1 to 4 may have feedback provided in the second PUCCH 610 transmission, and HARQ IDs 5 and 6 may have feedback provided in the third PUCCH 615 transmission. For one-time HARQ reporting, the UE reports feedback for all HARQ IDs, and using the rules of regular HARQ transmissions may introduce ambiguity as to what is the last PDSCH that the UE must complete decoding and report HARQ feedback. For example, there may be 8 configured HARQ IDs, and HARQ IDs 1-6 are scheduled consecutively, as in Figure 6 , and only requests one-time feedback in DCIs that schedule PDSCHs with HARQ IDs 2, 3, and 4. When scheduling PDSCH for HARQ ID 1, the base station has not yet completed decoding of the previous PUCCH and therefore does not know whether one-time HARQ feedback is needed. In such a case, one-time feedback can be requested in the next 3 DCIs (e.g., in response to failure to decode PUCCH1). However, for the last two DCIs with K1 pointing to another PUCCH, there is not even a need to request one-time feedback for that PUCCH.

[0098] exist Figure 6In the example of , the last PDSCH for which the HARQ result is reported in the one-time HARQ feedback is the PDSCH scheduled by the last DCI among all DCIs requesting one-time feedback and pointing to the same time slot used for PUCCH transmission. For example, for the one-time feedback in the second PUCCH 610, the last PDSCH is associated with HARQ ID 4. For HARQ IDs 5 and 6, HARQ feedback for the previous PDSCH is reported (i.e., the UE does not include the feedback of the last two PDSCHs in the one-time HARQ feedback in the second PUCCH 610). In this example, it is assumed that the request is carried in a UE-specific DCI carrying the PDSCH assignment. In other cases (the DCI requesting one-time feedback does not carry a PDSCH assignment), the last PDSCH for which the HARQ result is reported in the one-time HARQ-Ack feedback is the last PDSCH scheduled or received before the last DCI among all DCIs requesting one-time feedback and pointing to the same time slot used for HARQ-Ack transmission.

[0099] Figure 7 An example of feedback timing 700 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is illustrated. In some examples, feedback timing 700 can implement aspects of wireless communication systems 100 or 200. In this example, a UE (e.g., Figure 1 or UE 115 of 2) and a base station (e.g., Figure 1 1 or 2) can establish communications (e.g., via one or more CCs) for downlink transmissions, uplink transmissions, or both. In this example, the UE can transmit a first PUCCH 705, a second PUCCH 710, and a third PUCCH 715, and the base station can transmit a first PDSCH 725 transmission for HARQ IDs 1 to 4 and a second PDSCH 730 transmission for HARQ IDs 5 and 6.

[0100] In this example, when a one-time HARQ request is received, the UE can report the latest HARQ result only if the timeline condition N1 is met, which may be a function of the UE processing capability (e.g., the value of N1 is based on the UE capability indication (i.e., capability 1 or capability 2)). In this case, the UE counts down N1 symbols from the first symbol of the second PUCCH 710, and should report HARQ feedback for any PDSCH before this in the one-time feedback. Figure 7 In the example of , the UE will report HARQ IDs 1 to 5 in a one-time HARQ report transmitted in the second PUCCH 710. In the case where the HARQ feedback is carried on the PUSCH, the first symbol of the PUSCH is considered for N1 determination. Figure 7 In the example of , the downlink transmission associated with HARQ ID 5 is transmitted in both the one-time HARQ report and the regular HARQ report provided in the third PUCCH transmission 715. In this example, for HARQ ID 6, the HARQ information of the previous PDSCH (e.g., received before PUCCH1) is reported in the one-time feedback. In some cases, the codeword to be used for N1 timeline determination can be the actual PUCCH / PUSCH transmission after considering uplink control information (UCI) multiplexing. Alternatively, if there is a PUCCH on which HARQ information was originally intended to be transmitted (i.e., a PUCCH resource indicated by the PRI field in the last DCI among all DCIs with a value of K1, the value of K1 indicating the same time slot used for PUCCH transmission), the PUCCH is considered before UCI multiplexing. In a further case, two first codewords are determined according to the above two alternative schemes, and the earliest codeword from the two first codewords is considered for N1 determination. Figure 8 A block diagram 800 of a device 805 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is shown. The device 805 may be an example of aspects of a UE 115 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 820. The device 805 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0101] 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 acknowledgement feedback techniques in a shared radio frequency spectrum band, etc.). The information may be passed to other components of the device 805. The receiver 810 may be a reference Fig.11 Examples of aspects of the described transceiver 1120. The receiver 810 may utilize a single antenna or a collection of antennas.

[0102] The communication manager 815 may determine HARQ feedback for a downlink transmission set from a base station; receive downlink control information from the base station, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission subset, wherein the downlink transmission subset is smaller than the downlink transmission set; and transmit a feedback report including HARQ feedback for the downlink transmission subset to the base station.

[0103] The communication manager 815 may also determine HARQ feedback for a set of downlink transmissions from the base station, wherein each downlink transmission in the downlink transmission set has an associated data indicator indicating whether the downlink transmission includes an initial transmission of a transmission block or a retransmission of a previously transmitted transmission block; receive downlink control information from the base station, the downlink control information indicating that the UE will provide feedback reports for at least a subset of downlink transmissions; for each downlink transmission in at least the subset of downlink transmissions, identify the associated HARQ feedback based on one or more of a tri-state indication of the HARQ feedback, a default data indicator, or any combination thereof; and transmit to the base station a feedback report including the HARQ feedback for at least the subset of downlink transmissions.

[0104] The communication manager 815 may also receive resource allocation for a first subset of downlink transmissions from the base station; receive downlink control information from the base station, the downlink control information indicating that the UE will provide a second feedback report for a second subset of downlink transmissions, wherein the second subset of downlink transmissions includes one or more downlink transmissions different from the first subset of downlink transmissions; determine that HARQ feedback for one or more downlink transmissions in the first subset of downlink transmissions will be provided in the first feedback report; determine a first subset of HARQ feedback and a second subset of HARQ feedback, the first subset of HARQ feedback is for the first subset of downlink transmissions, and the second subset of HARQ feedback is for the second subset of downlink transmissions; and transmit the first subset of HARQ feedback to the base station, the first subset of HARQ feedback being multiplexed with the second subset of HARQ feedback in one or more feedback reports.

[0105] The communication manager 815 may also receive downlink control information from a base station indicating that the UE will provide a feedback report for a downlink transmission set; determine HARQ feedback for a downlink transmission set from a base station; format the feedback report for transmission to the base station, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information that schedules the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof; and transmit the feedback report including the HARQ feedback for the downlink transmission set to the base station. The communication manager 815 may be an example of aspects of the communication manager 1110 described herein.

[0106] The communication manager 815 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 815 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0107] The communication manager 815 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 815 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 815 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0108] The transmitter 820 may transmit signals generated by other components of the device 805. In some examples, the transmitter 820 may be co-located with the receiver 810 in a transceiver module. For example, the transmitter 820 may be a reference Fig.11 Examples of aspects of the described transceiver 1120. The transmitter 820 may utilize a single antenna or a collection of antennas.

[0109] Fig. 9 A block diagram 900 of a device 905 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is shown. The device 905 may be an example of aspects of the device 805 or UE 115 as described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 940. The device 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0110] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to acknowledgement feedback techniques in a shared radio frequency spectrum band, etc.). The information may be passed to other components of the device 905. The receiver 910 may be a reference Fig.11 Examples of aspects of the described transceiver 1120. The receiver 910 may utilize a single antenna or a collection of antennas.

[0111] The communication manager 915 may be an example of aspects of the communication manager 815 as described herein. The communication manager 915 may include a HARQ feedback manager 920, a DCI manager 925, a one-time report manager 930, and a codebook manager 935. The communication manager 915 may be an example of aspects of the communication manager 1110 described herein.

[0112] The HARQ feedback manager 920 may determine HARQ feedback for a set of downlink transmissions from a base station. The DCI manager 925 may receive downlink control information from the base station indicating that the UE will provide feedback reports for a subset of downlink transmissions, wherein the subset of downlink transmissions is smaller than the set of downlink transmissions. The one-time report manager 930 may transmit a feedback report including HARQ feedback for the subset of downlink transmissions to the base station.

[0113] In some cases, the HARQ feedback manager 920 may determine HARQ feedback for a set of downlink transmissions from a base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission includes an initial transmission of a transmission block or a retransmission of a previously transmitted transmission block. The DCI manager 925 may receive downlink control information from the base station indicating that the UE will provide feedback reports for at least a subset of downlink transmissions. The codebook manager 935 may identify the associated HARQ feedback for each downlink transmission in at least the subset of downlink transmissions based on one or more of a tri-state indication of HARQ feedback, a default data indicator, or any combination thereof. The one-time report manager 930 may transmit a feedback report including HARQ feedback for at least the subset of downlink transmissions to the base station.

[0114] In some cases, the DCI manager 925 may receive resource allocations for a first subset of downlink transmissions from a base station; and receive downlink control information from the base station indicating that the UE will provide a second feedback report for a second subset of downlink transmissions, wherein the second subset of downlink transmissions includes one or more downlink transmissions different from the first subset of downlink transmissions. The HARQ feedback manager 920 may determine that HARQ feedback for one or more downlink transmissions in the first subset of downlink transmissions will be provided in a first feedback report, and determine a first subset of HARQ feedback and a second subset of HARQ feedback, the first subset of HARQ feedback being for the first subset of downlink transmissions and the second subset of HARQ feedback being for the second subset of downlink transmissions. The one-time report manager 930 may transmit the first subset of HARQ feedback to the base station, the first subset of HARQ feedback being multiplexed with the second subset of HARQ feedback in one or more feedback reports.

[0115] In some cases, the DCI manager 925 may receive downlink control information from a base station indicating that the UE will provide a feedback report for a downlink transmission set. The HARQ feedback manager 920 may determine HARQ feedback for a downlink transmission set from a base station. The one-time report manager 930 may format a feedback report for transmission to a base station, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information that schedules the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof; and transmit a feedback report including HARQ feedback for the downlink transmission set to the base station.

[0116] The transmitter 940 may transmit signals generated by other components of the device 905. In some examples, the transmitter 940 may be co-located with the receiver 910 in a transceiver module. For example, the transmitter 940 may be a reference Fig.11 Examples of aspects of the described transceiver 1120. The transmitter 940 may utilize a single antenna or a collection of antennas.

[0117] Fig.10A block diagram 1000 of a communication manager 1005 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is shown. The communication manager 1005 may be an example of aspects of the communication manager 815, the communication manager 915, or the communication manager 1110 described herein. The communication manager 1005 may include a HARQ feedback manager 1010, a DCI manager 1015, a one-time report manager 1020, a codebook manager 1025, an NDI manager 1030, a multiplexing component 1035, an encoder 1040, and a feedback resource manager 1045. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0118] The HARQ feedback manager 1010 may determine HARQ feedback for a set of downlink transmissions from a base station. In some examples, the HARQ feedback manager 1010 may determine HARQ feedback for a set of downlink transmissions from a base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission includes an initial transmission of a transmission block or a retransmission of a previously transmitted transmission block. In some examples, the HARQ feedback manager 1010 may determine that HARQ feedback for one or more transmissions in a first subset of downlink transmissions will be provided in a first feedback report. In some examples, the HARQ feedback manager 1010 may determine a first subset of HARQ feedback and, the first subset of HARQ feedback is for a first subset of downlink transmissions, and the second subset of HARQ feedback is for a second subset of downlink transmissions.

[0119] In some examples, the HARQ feedback manager 1010 may determine HARQ feedback for a set of downlink transmissions from a base station. In some examples, the HARQ feedback manager 1010 may transmit a first subset of the HARQ feedback using a first set of uplink resources. In some examples, the HARQ feedback manager 1010 may transmit a second subset of the HARQ feedback using a second set of uplink resources.

[0120] In some cases, the HARQ feedback includes one or more of an acknowledgement (ACK) indication, a negative acknowledgement (NACK) indication, a new data indicator (NDI), or a combination thereof, each of which is associated with a corresponding downlink transmission in the set of downlink transmissions.

[0121] The DCI manager 1015 may receive downlink control information from a base station, the downlink control information indicating that the UE will provide feedback reports for a subset of downlink transmissions, wherein the subset of downlink transmissions is smaller than the set of downlink transmissions. In some examples, the DCI manager 1015 may receive downlink control information from a base station, the downlink control information indicating that the UE will provide feedback reports for at least a subset of downlink transmissions. In some examples, the DCI manager 1015 may receive resource allocations for a first subset of downlink transmissions from a base station. In some examples, the DCI manager 1015 may receive downlink control information from a base station, the downlink control information indicating that the UE will provide a second feedback report for a second subset of downlink transmissions, wherein the second subset of downlink transmissions includes one or more downlink transmissions that are different from the first subset of downlink transmissions. In some examples, the DCI manager 1015 may receive downlink control information from a base station, the downlink control information indicating that the UE will provide feedback reports for a set of downlink transmissions.

[0122] In some examples, DCI manager 1015 may receive a set of information fields in downlink control information. In some examples, DCI manager 1015 may determine a subset of downlink transmissions to be included with the feedback report based on a first information field of the set of information fields.

[0123] In some cases, the set of downlink transmissions includes a set of downlink transmissions associated with one or more of a set of transport blocks, a set of component carriers, a set of feedback process identifiers, a set of code block groups, or any combination thereof. In some cases, the first set of uplink resources and the second set of uplink resources are indicated in the downlink control information.

[0124] The one-time report manager 1020 may transmit a feedback report including HARQ feedback for a subset of downlink transmissions to the base station. In some examples, the one-time report manager 1020 may transmit a first subset of HARQ feedback to the base station, the first subset of HARQ feedback being multiplexed with a second subset of HARQ feedback in one or more feedback reports. In some examples, the one-time report manager 1020 may format the feedback report for transmission to the base station, wherein a last downlink transmission in the set of downlink transmissions to be included in the feedback report is determined based on the timing of downlink control information that schedules the set of downlink transmissions, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof.

[0125] In some examples, one-time report manager 1020 may format the first and second codebook entries into first and second feedback reports. In some examples, one-time report manager 1020 may transmit the feedback reports to a base station.

[0126] In some examples, the one-time report manager 1020 may determine the last downlink transmission as the latest downlink transmission scheduled in the downlink control information. In some examples, the one-time report manager 1020 may determine the last downlink transmission as the latest downlink transmission scheduled in one of two or more different downlink control information transmissions in which the feedback report is requested and indicating the same uplink resource set for transmitting the feedback report. In some examples, the one-time report manager 1020 may determine the last downlink transmission as the latest downlink transmission received before receiving the downlink control information. In some examples, the one-time report manager 1020 may determine the last downlink transmission as the latest downlink transmission that satisfies a feedback timeline condition, and wherein the feedback timeline condition indicates a minimum time duration between receiving a downlink transmission and transmitting an associated HARQ feedback.

[0127] In some cases, the first information field provides an explicit indication of a subset of downlink transmissions to be included with the feedback report. In some cases, the explicit indication specifies one or more component carriers, transport blocks, feedback process identifiers, code blocks, or any combination thereof to be included with the feedback report. In some cases, the first information field provides an implicit indication of a subset of downlink transmissions to be included with the feedback report. In some cases, the implicit indication is based on one or more component carriers (CCs) scheduled in the downlink control information, the CCs used to transmit the downlink control information, or any combination thereof. In some cases, the first field is a downlink assignment indicator field that is reused to indicate a subset of downlink transmissions to be included with the feedback report.

[0128] In some cases, the first subset of HARQ feedback includes HARQ feedback for at least the first downlink transmission, and the second subset of HARQ feedback also includes HARQ feedback for at least the first downlink transmission.

[0129] In some cases, a first symbol of an uplink resource set for transmitting a feedback report is selected for determining a minimum time duration, and wherein the first symbol of the uplink resource set is determined based on uplink control information that multiplexes the feedback report with other uplink control information, or one or more of an uplink control channel resource indicator provided with downlink control information.

[0130] The codebook manager 1025 may identify, for each downlink transmission in at least a subset of downlink transmissions, the associated HARQ feedback based on one or more of a tri-state indication of the HARQ feedback, a default data indicator, or any combination thereof. In some examples, the codebook manager 1025 may identify a codebook entry associated with acknowledgement feedback for a set of feedback process identifiers to be reported in a feedback report.

[0131] In some examples, the codebook manager 1025 may identify a first codebook entry associated with a first subset of HARQ feedback, wherein the first codebook entry is mapped to the first subset of HARQ feedback and one or more parameters associated with the first subset of downlink transmissions. In some examples, the codebook manager 1025 may identify a second codebook entry associated with a second subset of acknowledgment feedback, wherein the second codebook entry is mapped to the second subset of HARQ feedback and one or more parameters different from the first codebook entry. In some examples, the codebook manager 1025 may identify a second codebook entry associated with the second subset of HARQ feedback based on the multiplexed HARQ feedback set.

[0132] The NDI manager 1030 may manage NDI information associated with the HARQ ID. In some cases, the default data indicator is reported for a first feedback process identifier for which the UE has not received scheduling information indicating that the first feedback process identifier is to be used to indicate feedback for one downlink transmission in the downlink transmission subset.

[0133] The multiplexing component 1035 can concatenate the second feedback report with the first feedback report. In some examples, the multiplexing component 1035 can multiplex the first subset of HARQ feedback and the second subset of HARQ feedback to generate a multiplexed HARQ feedback set. The encoder 1040 can encode the payload of each of the first feedback report and the second feedback report, wherein the encoding is performed before or after the concatenation.

[0134] The feedback resource manager 1045 may identify uplink resources for HARQ transmissions. In some cases, the downlink control information provides an uplink control channel resource indicator mapped to the first set of uplink resources and the second set of uplink resources. In some cases, a timeline for transmissions using the first set of uplink resources and the second set of uplink resources is indicated by a feedback timing indicator mapped to time domain resources of the first set of uplink resources and the second set of uplink resources.

[0135] Fig.11A diagram of a system 1100 including a device 1105 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown. The device 1105 may be an example of a device 805, a device 905, or a UE 115 as described herein or include a component of the device 805, a device 905, or a UE 115. The device 1105 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1110, an I / O controller 1115, a transceiver 1120, an antenna 1125, a memory 1130, and a processor 1140. These components may be in electronic communication via one or more buses (e.g., a bus 1145).

[0136] The communication manager 1110 can determine HARQ feedback for a downlink transmission set from a base station; receive downlink control information from the base station, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission subset, wherein the downlink transmission subset is smaller than the downlink transmission set; and transmit a feedback report including HARQ feedback for the downlink transmission subset to the base station.

[0137] The communication manager 1110 may also determine HARQ feedback for a set of downlink transmissions from the base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission includes an initial transmission of a transmission block or a retransmission of a previously transmitted transmission block; receive downlink control information from the base station, the downlink control information indicating that the UE will provide feedback reports for at least a subset of downlink transmissions; for each downlink transmission in at least the subset of downlink transmissions, identify the associated HARQ feedback based on one or more of a tri-state indication of the HARQ feedback, a default data indicator, or any combination thereof; and transmit to the base station a feedback report including the HARQ feedback for at least the subset of downlink transmissions.

[0138] The communication manager 1110 may also receive resource allocation for a first subset of downlink transmissions from the base station; receive downlink control information from the base station, the downlink control information indicating that the UE will provide a second feedback report for a second subset of downlink transmissions, wherein the second subset of downlink transmissions includes one or more downlink transmissions different from the first subset of downlink transmissions; determine that HARQ feedback for one or more downlink transmissions in the first subset of downlink transmissions will be provided in the first feedback report; determine a first subset of HARQ feedback and a second subset of HARQ feedback, the first subset of HARQ feedback is for the first subset of downlink transmissions, and the second subset of HARQ feedback is for the second subset of downlink transmissions; and transmit the first subset of HARQ feedback to the base station, the first subset of HARQ feedback being multiplexed with the second subset of HARQ feedback in one or more feedback reports.

[0139] The communication manager 1110 may also receive downlink control information from the base station, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission set; determine HARQ feedback for the downlink transmission set from the base station; format the feedback report for transmission to the base station, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information scheduling the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof; and transmit a feedback report including HARQ feedback for the downlink transmission set to the base station.

[0140] I / O controller 1115 can manage input and output signals for device 1105. I / O controller 1115 can also manage peripheral devices that are not integrated into device 1105. In some cases, I / O controller 1115 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1115 can utilize an operating system, such as Or another known operating system. In other cases, I / O controller 1115 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1115 may be implemented as part of a processor. In some cases, a user may interact with device 1105 via I / O controller 1115 or via hardware components controlled by I / O controller 1115.

[0141] The transceiver 1120 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1120 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1120 can also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0142] In some cases, a wireless device may include a single antenna 1125. However, in some cases, the device may have more than one antenna 1125, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0143] The memory 1130 may include RAM and ROM. The memory 1130 may store computer-readable, computer-executable code 1135 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 1130 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0144] Processor 1140 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1140 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1140. Processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause device 1105 to perform various functions (e.g., various functions or tasks supporting confirmation feedback technology in a shared radio frequency spectrum band).

[0145] The code 1135 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1135 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1135 may not be directly executed by the processor 1140, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0146] Fig.12A block diagram 1200 of a device 1205 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is shown. The device 1205 may be an example of aspects of a base station 105 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1220. The device 1205 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0147] 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 acknowledgement feedback techniques in a shared radio frequency spectrum band, etc.). The information may be passed to other components of device 1205. Receiver 1210 may be a reference Fig.15 Examples of aspects of the described transceiver 1520. The receiver 1210 may utilize a single antenna or a collection of antennas.

[0148] The communication manager 1215 may transmit a downlink transmission set to the UE, the downlink transmission set having one or more corresponding uplink resource sets for transmitting HARQ feedback from the UE, determine the HARQ feedback loss from the UE for one or more downlink transmissions in the downlink transmission set based on monitoring the one or more uplink resource sets, and transmit downlink control information to the UE, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission subset, wherein the downlink transmission subset is smaller than the downlink transmission set.

[0149] The communication manager 1215 may also configure the UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of a transmission block or a retransmission of a previously transmitted transmission block, and wherein the HARQ feedback indicates one or more of a default data indication, a tri-state indication of feedback based on an acknowledgment (ACK) and a transmission block indication or a negative acknowledgment (NACK) indication, or a combination thereof; transmit a downlink transmission set to the UE, the downlink transmission set having one or more corresponding uplink resource sets for transmitting HARQ feedback from the UE; determine, based on monitoring the one or more uplink resource sets, that HARQ feedback from the UE is lost for one or more downlink transmissions in the downlink transmission set; transmit downlink control information to the UE, the downlink control information indicating that the UE will provide a feedback report for at least the one or more downlink transmissions; and receive a feedback report from the UE, the feedback report indicating one or more of a tri-state indication of feedback, a default data indication, or any combination thereof for each of the one or more downlink transmissions.

[0150] The communication manager 1215 may also transmit a first subset of downlink transmissions to the UE, the first subset of downlink transmissions having corresponding one or more uplink resource sets for transmitting HARQ feedback from the UE, determine, based on monitoring the one or more uplink resource sets, that HARQ feedback from the UE is lost for one or more downlink transmissions in the first subset of downlink transmissions; transmit downlink control information to the UE, the downlink control information including resource allocations for a second subset of downlink transmissions and indicating that the UE will provide a first feedback report for the first subset of downlink transmissions, and wherein the second subset of downlink transmissions has an associated second feedback report; and receive from the UE a first feedback report multiplexed with the second feedback report in one or more uplink control information transmissions.

[0151] The communication manager 1215 may also transmit downlink control information to the UE indicating that the UE will provide a feedback report for a downlink transmission set; receive a feedback report from the UE, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information that schedules the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof; and determine HARQ feedback based on the feedback report. The communication manager 1215 may be an example of aspects of the communication manager 1510 described herein.

[0152] The communication manager 1215 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1215 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0153] The communication manager 1215 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1215 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1215 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0154] The transmitter 1220 may transmit signals generated by other components of the device 1205. In some examples, the transmitter 1220 may be co-located with the receiver 1210 in a transceiver module. For example, the transmitter 1220 may be a reference Fig.15 Examples of various aspects of the described transceiver 1520. The transmitter 1220 may utilize a single antenna or a collection of antennas.

[0155] Fig.13 A block diagram 1300 of a device 1305 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is shown. The device 1305 may be an example of aspects of the device 1205 or base station 105 as described herein. The device 1305 may include a receiver 1310, a communication manager 1315, and a transmitter 1345. The device 1305 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0156] Receiver 1310 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 acknowledgement feedback techniques in a shared radio frequency spectrum band, etc.). The information may be passed to other components of device 1305. Receiver 1310 may be a reference Fig.15 Examples of various aspects of the described transceiver 1520. The receiver 1310 may utilize a single antenna or a collection of antennas.

[0157] The communication manager 1315 may be an example of aspects of the communication manager 1215 as described herein. The communication manager 1315 may include a PDSCH manager 1320, a HARQ feedback manager 1325, a DCI manager 1330, a configuration manager 1335, and a one-time report manager 1340. The communication manager 1315 may be an example of aspects of the communication manager 1510 described herein.

[0158] In some cases, the PDSCH manager 1320 may transmit a downlink transmission set to the UE, the downlink transmission set having corresponding one or more uplink resource sets for transmitting HARQ feedback from the UE. The HARQ feedback manager 1325 may determine that HARQ feedback from the UE is lost for one or more downlink transmissions in the downlink transmission set based on monitoring the one or more uplink resource sets. The DCI manager 1330 may transmit downlink control information to the UE indicating that the UE will provide feedback reports for a downlink transmission subset that is smaller than the downlink transmission set.

[0159] In some cases, the configuration manager 1335 may configure the UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of a transport block or a retransmission of a previously transmitted transport block, and wherein the HARQ feedback indicates one or more of a default data indication, a tri-state indication based on feedback of an acknowledgement (ACK) and a transport block indication or a negative acknowledgement (NACK) indication, or a combination thereof. The PDSCH manager 1320 may transmit a downlink transmission set to the UE, the downlink transmission set having one or more corresponding uplink resource sets for transmitting HARQ feedback from the UE. The HARQ feedback manager 1325 may determine that HARQ feedback from the UE is lost for one or more downlink transmissions in the downlink transmission set based on monitoring one or more uplink resource sets. The DCI manager 1330 may transmit downlink control information to the UE, the downlink control information indicating that the UE will provide feedback reports for at least the one or more downlink transmissions. The one-time reporting manager 1340 may receive a feedback report from the UE indicating, for each of one or more downlink transmissions, one or more of a tri-state indication of feedback, a default data indication, or any combination thereof.

[0160] In some cases, the PDSCH manager 1320 may transmit to the UE a first subset of downlink transmissions, the first subset of downlink transmissions having corresponding one or more uplink resource sets for transmitting HARQ feedback from the UE. The HARQ feedback manager 1325 may determine that HARQ feedback from the UE is lost for one or more downlink transmissions in the first subset of downlink transmissions based on monitoring the one or more uplink resource sets. The DCI manager 1330 may transmit to the UE downlink control information including resource allocations for a second subset of downlink transmissions and indicating that the UE will provide a first feedback report for the first subset of downlink transmissions, and wherein the second subset of downlink transmissions has an associated second feedback report. The one-time report manager 1340 may receive from the UE a first feedback report multiplexed with a second feedback report in one or more uplink control information transmissions.

[0161] In some cases, the DCI manager 1330 may transmit downlink control information to the UE indicating that the UE will provide a feedback report for a downlink transmission set. The one-time report manager 1340 may receive a feedback report from the UE, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information that scheduled the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof. The HARQ feedback manager 1325 may determine HARQ feedback based on the feedback report.

[0162] Transmitter 1345 may transmit signals generated by other components of device 1305. In some examples, transmitter 1345 may be co-located with receiver 1310 in a transceiver module. Fig.15 Examples of various aspects of the described transceiver 1520. The transmitter 1345 may utilize a single antenna or a collection of antennas.

[0163] Fig.14A block diagram 1400 of a communication manager 1405 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure is shown. The communication manager 1405 may be an example of aspects of the communication manager 1215, the communication manager 1315, or the communication manager 1510 described herein. The communication manager 1405 may include a PDSCH manager 1410, a HARQ feedback manager 1415, a DCI manager 1420, a configuration manager 1425, a one-time report manager 1430, a codebook manager 1435, an NDI manager 1440, a multiplexing component 1445, a decoder 1450, and a feedback resource manager 1455. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0164] The PDSCH manager 1410 may transmit to the UE a downlink transmission set with corresponding one or more uplink resource sets for transmitting HARQ feedback from the UE.

[0165] In some examples, the PDSCH manager 1410 may transmit a downlink transmission set to the UE, the downlink transmission set having one or more corresponding uplink resource sets for transmitting HARQ feedback from the UE.

[0166] In some examples, the PDSCH manager 1410 may transmit a first subset of downlink transmissions to the UE, the first subset of downlink transmissions having corresponding one or more sets of uplink resources for transmitting HARQ feedback from the UE.

[0167] The HARQ feedback manager 1415 may determine, based on monitoring one or more sets of uplink resources, that HARQ feedback from the UE is missing for one or more downlink transmissions in the set of downlink transmissions.

[0168] In some examples, the HARQ feedback manager 1415 may determine that HARQ feedback from the UE is lost for one or more downlink transmissions in the downlink transmission set based on monitoring one or more uplink resource sets.

[0169] In some examples, the HARQ feedback manager 1415 may determine that HARQ feedback from the UE is lost for one or more downlink transmissions in the first subset of downlink transmissions based on monitoring one or more sets of uplink resources.

[0170] In some examples, the HARQ feedback manager 1415 may determine the HARQ feedback based on the feedback report. In some examples, the HARQ feedback manager 1415 may receive a multiplexed set of HARQ feedback. In some examples, the HARQ feedback manager 1415 may determine the HARQ feedback from the UE for each of the first feedback report and the second feedback report based on a mapping between a codebook and the HARQ feedback.

[0171] In some cases, the HARQ feedback includes one or more of an acknowledgment (ACK) indication, a negative acknowledgment (NACK) indication, a new data indicator (NDI), or a combination thereof, each of which is associated with a corresponding downlink transmission in the set of downlink transmissions. In some cases, the first feedback report includes HARQ feedback for at least the first downlink transmission, and the second feedback report also includes HARQ feedback for at least the first downlink transmission.

[0172] The DCI manager 1420 may transmit downlink control information to the UE, the downlink control information indicating that the UE will provide feedback reports for at least a subset of downlink transmissions, wherein the downlink transmission subset is smaller than the downlink transmission set.

[0173] In some examples, the DCI manager 1420 may transmit downlink control information to the UE, the downlink control information including resource allocations for a second subset of downlink transmissions and indicating that the UE will provide a first feedback report for the first subset of downlink transmissions, and wherein the second subset of downlink transmissions has an associated second feedback report.

[0174] In some examples, DCI manager 1420 may transmit a set of information fields in downlink control information, where a first information field in the set of information fields indicates a subset of downlink transmissions to be included with the feedback report.

[0175] In some cases, the downlink transmission subset includes one or more downlink transmissions associated with one of a transport block in a set of transport blocks, a component carrier in a set of component carriers, a feedback process identifier in a set of feedback process identifiers, a code block in a set of code blocks, or any combination thereof.

[0176] In some cases, the first information field provides an explicit indication of a subset of downlink transmissions to be included with the feedback report. In some cases, the explicit indication specifies one or more component carriers, transport blocks, feedback process identifiers, code blocks, or any combination thereof to be included with the feedback report. In some cases, the first information field provides an implicit indication of a subset of downlink transmissions to be included with the feedback report. In some cases, the implicit indication is based on one or more component carriers (CCs) scheduled in the downlink control information, the CCs used to transmit the downlink control information, or any combination thereof.

[0177] In some cases, the first field is a downlink assignment indicator field that is reused to indicate a subset of downlink transmissions to be included with the feedback report. In some cases, the first set of uplink resources and the second set of uplink resources are indicated in the downlink control information. In some cases, the downlink control information provides an uplink control channel resource indicator that maps to the first set of uplink resources and the second set of uplink resources.

[0178] The configuration manager 1425 may configure the UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission comprises an initial transmission of a transport block or a retransmission of a previously transmitted transport block, and wherein the HARQ feedback indicates one or more of a default data indication, a tri-state indication based on feedback of an acknowledgment (ACK) and a transport block indication or a negative acknowledgment (NACK) indication, or a combination thereof.

[0179] The one-time reporting manager 1430 may receive a feedback report from the UE indicating, for each of one or more downlink transmissions, one or more of a tri-state indication of feedback, a default data indication, or any combination thereof.

[0180] In some examples, the one-time reporting manager 1430 may receive a first feedback report from the UE multiplexed with a second feedback report in one or more uplink control information transmissions.

[0181] In some examples, the one-time reporting manager 1430 may receive a feedback report from a UE, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information scheduling the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof.

[0182] In some examples, the one-time report manager 1430 may determine the last downlink transmission as the latest downlink transmission scheduled in the downlink control information. In some examples, the one-time report manager 1430 may determine the last downlink transmission as the latest downlink transmission scheduled in one of two or more different downlink control information transmissions in which the feedback report is requested and indicating the same uplink resource set used to transmit the feedback report. In some examples, the one-time report manager 1430 may determine the last downlink transmission as the latest downlink transmission transmitted before the downlink control information is transmitted. In some examples, the one-time report manager 1430 may determine the last downlink transmission as the latest downlink transmission that satisfies the feedback timeline condition, and wherein the feedback timeline condition indicates a minimum time duration between receiving the downlink transmission at the UE and transmitting the associated HARQ feedback.

[0183] In some cases, a first symbol of an uplink resource set for transmitting a feedback report is selected for determining a minimum time duration, and wherein the first symbol of the uplink resource set is determined based on uplink control information that multiplexes the feedback report with other uplink control information or one or more of an uplink control channel resource indicator provided with downlink control information.

[0184] The codebook manager 1435 may configure the codebook to have a set of entries that are mapped to a set of different HARQ feedback combinations for a set of feedback process identifiers to be reported in the feedback report. In some examples, the codebook manager 1435 may identify a first codebook entry associated with a first feedback report, wherein the first codebook entry is mapped to a first subset of HARQ feedback and one or more parameter values ​​associated with a first subset of downlink transmissions. In some examples, the codebook manager 1435 may identify a second codebook entry associated with a second feedback report, wherein the second codebook entry is mapped to a second subset of HARQ feedback and one or more parameter values ​​different from the first codebook entry.

[0185] The NDI manager 1440 may identify a default data indication reported by the UE for a first feedback process identifier for which the UE has not received scheduling information, the scheduling information indicating that the first feedback process identifier is to be used to indicate feedback for one of the downlink transmission subsets. In some cases, when scheduling information indicating the first feedback process identifier has not been transmitted to the UE, the default data indication is provided to a polarity decoder to be used as a frozen bit to assist in decoding the feedback report. In some cases, when scheduling information indicating the first feedback process identifier is transmitted to the UE, the default data indication is provided to the UE.

[0186] The multiplexing component 1445 can demultiplex the HARQ feedback based on a first codebook configured for reporting the first feedback report and a second codebook configured for reporting the second feedback report. In some cases, the first feedback report is concatenated with the second feedback report.

[0187] The decoder 1450 may decode the uplink transmission. In some cases, the payload of each of the first feedback report and the second feedback report is encoded at the UE, and wherein the encoding is performed before or after the UE concatenates the first report with the second report, and wherein the decoder decodes the payload based on the encoding at the UE.

[0188] The feedback resource manager 1455 may receive the first feedback report using the first set of uplink resources. In some examples, the feedback resource manager 1455 may receive the second feedback report using the second set of uplink resources. In some cases, the timeline for the UE to transmit using the first set of uplink resources and the second set of uplink resources is indicated by a feedback timing indicator mapped to the time domain resources of the first set of uplink resources and the second set of uplink resources.

[0189] Fig.15 A diagram of a system 1500 including a device 1505 supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to various aspects of the present disclosure is shown. The device 1505 may be an example of a device 1205, a device 1305, or a base station 105 as described herein or include components of the above devices. The device 1505 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1510, a network communication manager 1515, a transceiver 1520, an antenna 1525, a memory 1530, a processor 1540, and an inter-station communication manager 1545. These components may be in electronic communication via one or more buses (e.g., bus 1550).

[0190] The communication manager 1510 may transmit a downlink transmission set to the UE, the downlink transmission set having one or more corresponding uplink resource sets for transmitting HARQ feedback from the UE; determine, based on monitoring the one or more uplink resource sets, that HARQ feedback from the UE is lost for one or more downlink transmissions in the downlink transmission set; and transmit downlink control information to the UE, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission subset, wherein the downlink transmission subset is smaller than the downlink transmission set.

[0191] The communication manager 1510 may also configure the UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of a transmission block or a retransmission of a previously transmitted transmission block, and wherein the HARQ feedback indicates one or more of a default data indication, a tri-state indication of feedback based on an acknowledgment (ACK) and a transmission block indication or a negative acknowledgment (NACK) indication, or a combination thereof; transmit a downlink transmission set to the UE, the downlink transmission set having one or more corresponding uplink resource sets for transmitting HARQ feedback from the UE; determine, based on monitoring the one or more uplink resource sets, that HARQ feedback from the UE is lost for one or more downlink transmissions in the downlink transmission set; transmit downlink control information to the UE, the downlink control information indicating that the UE will provide a feedback report for at least the one or more downlink transmissions; and receive a feedback report from the UE, the feedback report indicating one or more of a tri-state indication of feedback, a default data indication, or any combination thereof for each of the one or more downlink transmissions.

[0192] The communication manager 1510 may also transmit a first subset of downlink transmissions to the UE, the first subset of downlink transmissions having corresponding one or more uplink resource sets for transmitting HARQ feedback from the UE; determine, based on monitoring the one or more uplink resource sets, that HARQ feedback from the UE is lost for one or more downlink transmissions in the first subset of downlink transmissions; transmit downlink control information to the UE, the downlink control information including resource allocations for a second subset of downlink transmissions and indicating that the UE will provide a first feedback report for the first subset of downlink transmissions, and wherein the second subset of downlink transmissions has an associated second feedback report; and receive from the UE a first feedback report multiplexed with the second feedback report in one or more uplink control information transmissions.

[0193] The communication manager 1510 may also transmit downlink control information to the UE, indicating that the UE will provide a feedback report for a downlink transmission set; receive a feedback report from the UE, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information scheduling the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof; and determine HARQ feedback based on the feedback report.

[0194] The network communications manager 1515 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1515 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0195] The transceiver 1520 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1520 may represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1520 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0196] In some cases, a wireless device may include a single antenna 1525. However, in some cases, the device may have more than one antenna 1525, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0197] Memory 1530 may include RAM, ROM, or a combination thereof. Memory 1530 may store computer readable code 1535 including instructions that, when executed by a processor (e.g., processor 1540), cause the device to perform various functions described herein. In some cases, memory 1530 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0198] Processor 1540 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1540 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1540. Processor 1540 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause device 1505 to perform various functions (e.g., various functions or tasks of supporting confirmation feedback technology in a shared radio frequency spectrum band).

[0199] The inter-site communication manager 1545 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with the UE 115 in cooperation with the other base stations 105. For example, the inter-site communication manager 1545 may coordinate the scheduling of transmissions to the UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1545 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0200] The code 1535 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1535 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1535 may not be directly executed by the processor 1540, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0201] Fig.16 1 is a flow chart illustrating a method 1600 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. Figures 8 to 11 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0202] At 1605, the UE may determine HARQ feedback for a set of downlink transmissions from a base station. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 8 to 11 The described HARQ feedback manager is performed.

[0203] At 1610, the UE may receive downlink control information from a base station, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission subset, wherein the downlink transmission subset is smaller than the downlink transmission set. 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 as described with reference to Figures 8 to 11 The DCI manager described herein is used to perform the above operations.

[0204] At 1615, the UE may transmit a feedback report including HARQ feedback for the downlink transmission subset to the base station. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 8 to 11 The one-time report manager described is used to perform the

[0205] Fig.17 1 is a flow chart illustrating a method 1700 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. Figures 8 to 11In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0206] At 1705, the UE may determine HARQ feedback for a set of downlink transmissions from a base station, wherein each downlink transmission in the set of downlink transmissions has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described with reference to Figures 8 to 11 The described HARQ feedback manager is performed.

[0207] At 1710, the UE may receive downlink control information from a base station, the downlink control information indicating that the UE will provide a one-time feedback report for at least the downlink transmission subset. 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 as described with reference to Figures 8 to 11 The DCI manager described herein is used to perform the above operations.

[0208] At 1715, the UE may identify associated HARQ feedback for each downlink transmission in at least the downlink transmission subset, the associated HARQ feedback including an ACK / NACK indication and an associated data indicator. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be as described with reference to Figures 8 to 11 The described codebook manager is executed.

[0209] At 1720, the UE may transmit to the base station the one-time feedback report including the HARQ feedback for at least the downlink transmission subset. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be as described with reference to Figures 8 to 11 The one-time report manager described is used to perform the

[0210] Fig.18 1 is a flow chart illustrating a method 1800 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 1800 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1800 may be implemented by a UE 115 or a component thereof as described herein. Figures 8 to 11 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0211] At 1805, the UE may receive a resource allocation for a first subset of downlink transmissions from a base station. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 8 to 11 The DCI manager described herein is used to perform the above operations.

[0212] At 1810, the UE may determine that HARQ feedback for one or more downlink transmissions in a first subset of downlink transmissions is to be provided in a first feedback report. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 8 to 11 The described HARQ feedback manager is performed.

[0213] At 1815, the UE may receive downlink control information from the base station, the downlink control information indicating that the UE will provide a second feedback report for a second subset of downlink transmissions, wherein the second subset of downlink transmissions includes one or more downlink transmissions that are different from the first subset of downlink transmissions. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed as described with reference to Figures 8 to 11 The DCI manager described herein is used to perform the above operations.

[0214] At 1820, the UE may determine a first subset of HARQ feedback for a first subset of downlink transmissions and a second subset of HARQ feedback for a second subset of downlink transmissions. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed as described with reference to Figures 8 to 11 The described HARQ feedback manager is performed.

[0215] At 1825, the UE may transmit a first subset of HARQ feedback to the base station, the first subset of HARQ feedback being multiplexed with a second subset of HARQ feedback in one or more feedback reports. 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 as described with reference to Figures 8 to 11 The one-time report manager described is used to perform the

[0216] Fig.19 1 is a flow chart illustrating a method 1900 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 1900 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1900 may be implemented by a UE 115 or a component thereof as described herein. Figures 8 to 11In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0217] At 1905, the UE may receive downlink control information from a base station, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission set. 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 as described with reference to Figures 8 to 11 The DCI manager described herein is used to perform the above operations.

[0218] At 1910, the UE may determine HARQ feedback for a set of downlink transmissions from a base station. 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 as described with reference to Figures 8 to 11 The described HARQ feedback manager is performed.

[0219] At 1915, the UE may format a feedback report for transmission to the base station, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information that schedules the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof. 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 as described with reference to Figures 8 to 11 The one-time report manager described is used to perform the

[0220] At 1920, the UE may transmit a feedback report including HARQ feedback for a downlink transmission set to the base station. The operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be performed as described with reference to Figures 8 to 11 The one-time report manager described is used to perform the

[0221] Fig. 20 1 is a flow chart illustrating a method 2000 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 2000 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 2000 may be implemented by a base station 105 or components thereof as described herein. Figures 12 to 15 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0222] At 2005, the base station may transmit a downlink transmission set to the UE, the downlink transmission set having one or more corresponding uplink resource sets for transmitting HARQ feedback from the UE. 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 as described with reference to Figures 12 to 15 The described PDSCH manager is performed.

[0223] At 2010, the base station may determine that HARQ feedback from the UE is lost for one or more downlink transmissions in the downlink transmission set based on monitoring one or more uplink resource sets. 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 as described with reference to Figures 12 to 15 The described HARQ feedback manager is performed.

[0224] At 2015, the base station may transmit downlink control information to the UE, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission subset, wherein the downlink transmission subset is smaller than the downlink transmission set. The operations of 2015 may be performed according to the methods described herein. In some examples, aspects of the operations of 2015 may be performed as described with reference to Figures 12 to 15 The DCI manager described herein is used to perform the above operations.

[0225] Fig.21 1 is a flow chart illustrating a method 2100 for supporting a received feedback technique in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 2100 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 2100 may be implemented by a base station 105 or components thereof as described herein. Figures 12 to 15 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0226] At 2105, the base station may configure the UE to report HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each downlink transmission has an associated data indicator indicating whether the downlink transmission includes an initial transmission of downlink data or a retransmission of previously transmitted downlink data, and wherein the HARQ feedback indicates an ACK / NACK and the data indicator for each of the one or more downlink transmissions. The operations of 2105 may be performed according to the methods described herein. In some examples, aspects of the operations of 2105 may be performed as described with reference to Figures 12 to 15 The configuration manager described is executed.

[0227] At 2110, the base station may transmit a downlink transmission set to the UE. The operations of 2110 may be performed according to the methods described herein. In some examples, aspects of the operations of 2110 may be performed as described with reference to Figures 12 to 15 The described PDSCH manager is performed.

[0228] At 2115, the base station may transmit downlink control information to the UE, the downlink control information indicating that the UE will provide a one-time feedback report for at least one or more downlink transmissions. 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 as described with reference to Figures 12 to 15 The DCI manager described herein is used to perform the above operations.

[0229] At 2120, the base station may receive a one-time feedback report from the UE indicating HARQ feedback for each of the one or more downlink transmissions. The operations of 2120 may be performed according to the methods described herein. In some examples, aspects of the operations of 2120 may be performed as described with reference to Figures 12 to 15 The one-time report manager described is used to perform the

[0230] Fig. 22 200 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 2200 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 2200 may be implemented by a base station 105 or components thereof as described herein. Figures 12 to 15 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0231] At 2205, the base station may transmit a first subset of downlink transmissions to the UE, the first subset of downlink transmissions having corresponding one or more uplink resource sets for transmitting HARQ feedback from the UE. The operations of 2205 may be performed according to the methods described herein. In some examples, aspects of the operations of 2205 may be performed as described with reference to Figures 12 to 15 The described PDSCH manager is performed.

[0232] At 2210, the base station may determine, based on monitoring one or more uplink resource sets, that HARQ feedback from the UE is lost for one or more downlink transmissions in a first subset of downlink transmissions. 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 as described with reference to Figures 12 to 15 The described HARQ feedback manager is performed.

[0233] At 2215, the base station may transmit downlink control information to the UE, the downlink control information including a resource allocation for a second subset of downlink transmissions and indicating that the UE will provide a first feedback report for the first subset of downlink transmissions, and wherein the second subset of downlink transmissions has an associated second feedback report. The operations of 2215 may be performed according to the methods described herein. In some examples, aspects of the operations of 2215 may be performed as described with reference to Figures 12 to 15 The DCI manager described herein is used to perform the above operations.

[0234] At 2220, the base station may receive from the UE a first feedback report multiplexed with a second feedback report in one or more uplink control information transmissions. The operations of 2220 may be performed according to the methods described herein. In some examples, aspects of the operations of 2220 may be as described with reference to Figures 12 to 15 The one-time report manager described is used to perform the

[0235] Fig.23 1 is a flow chart illustrating a method 2300 for supporting acknowledgement feedback techniques in a shared radio frequency spectrum band according to aspects of the present disclosure. The operations of the method 2300 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 2300 may be implemented by a base station 105 or components thereof as described herein. Figures 12 to 15 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0236] At 2305, the base station may transmit downlink control information to the UE, the downlink control information indicating that the UE will provide a feedback report for a downlink transmission set. The operations of 2305 may be performed according to the methods described herein. In some examples, aspects of the operations of 2305 may be performed as described with reference to Figures 12 to 15 The DCI manager described herein is used to perform the above operations.

[0237] At 2310, the base station may receive a feedback report from the UE, wherein the last downlink transmission in the downlink transmission set to be included in the feedback report is determined based on the timing of the downlink control information that schedules the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof. The operations of 2310 may be performed according to the methods described herein. In some examples, aspects of the operations of 2310 may be performed as described with reference to Figures 12 to 15 The one-time report manager described is used to perform the

[0238] At 2315, the base station may determine HARQ feedback based on the feedback report. The operations of 2315 may be performed according to the methods described herein. In some examples, aspects of the operations of 2315 may be performed as described with reference to Figures 12 to 15 The described HARQ feedback manager is performed.

[0239] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0240] The technology described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. CDMA systems can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions are generally referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is generally referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. TDMA systems can implement radio technologies such as Global System for Mobile Communications (GSM).

[0241] OFDMA systems can implement radio technologies 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. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used for systems and radio technologies mentioned herein as well as for other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0242] A macro cell generally covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions to a network provider. A small cell may be associated with a lower power base station (compared to a macro cell), and the small cell may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency band as the macro cell. According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. A pico cell, for example, may cover a smaller geographic area and may allow unrestricted access by UEs with service subscriptions to a network provider. A femto cell may also cover a smaller geographic area (e.g., a residence) and may provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in the residence, etc.). 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 more (eg, two, three, four, etc.) cells and may also support communication using one or more component carriers.

[0243] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, each base station may have similar frame timing, and transmissions from different base stations may be roughly aligned in time. For asynchronous operation, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0244] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0245] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0246] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0247] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Any connection is also properly referred to as computer-readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0248] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0249] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0250] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or that fall within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0251] The description herein is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: determining hybrid automatic repeat request (HARQ) feedback for a set of HARQ processes associated with a downlink transmission from a base station, wherein each HARQ process in the set of HARQ processes has an associated data indicator indicating whether the associated downlink transmission comprises an initial transmission of downlink data or a retransmission of previously transmitted downlink data; receiving downlink control information from the base station, the downlink control information indicating that the UE will provide a one-time feedback report for at least a subset of HARQ processes; identifying, for each HARQ process in at least the subset of HARQ processes, associated HARQ feedback, the associated HARQ feedback comprising an acknowledgement / negative acknowledgement indication of a downlink transmission associated with the HARQ process and the associated data indicator, wherein in the absence of scheduling information for the associated HARQ process, a default data indicator is identified as the associated data indicator for one or more HARQ processes; as well as The one-time feedback report including the HARQ feedback and an associated data indicator for each HARQ process in at least the subset of HARQ processes is transmitted to the base station.

2. The method of claim 1, wherein the transmitting comprises: Only the one-time feedback report is transmitted to the base station together with uplink transmission.

3. The method of claim 1, wherein the one-time feedback report comprises one or more of an acknowledgement (ACK) indication, a negative acknowledgement (NACK) indication, the data indicator, or a combination thereof, each of which is associated with a corresponding HARQ process in the HARQ process subset. 4 . The method of claim 1 , wherein the data indicator is a new data indicator (NDI), the NDI being included in the one-time feedback report based on a configuration to include NDI information with the HARQ feedback. 5 . The method of claim 1 , wherein the HARQ process set comprises a plurality of HARQ processes, each HARQ process having a different HARQ process identifier.

6. The method of claim 1 , wherein the one-time feedback report provides HARQ feedback and an associated data indicator for each HARQ process ID in a plurality of HARQ process IDs, and wherein the HARQ feedback is associated with one or more of a plurality of transport blocks, a plurality of component carriers, a plurality of code block groups, or any combination thereof.

7. The method of claim 1 , wherein identifying the associated HARQ feedback comprises: A codebook associated with the HARQ feedback for at least the subset of HARQ processes to be reported in the one-time feedback report is identified.

8. A method as claimed in claim 1, wherein the latest HARQ process in the HARQ process set to be included in the one-time feedback report is determined at least in part based on the timing of downlink control information scheduling the downlink transmission, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof.

9. A method for wireless communication at a base station, comprising: configuring a user equipment (UE) to have a set of hybrid automatic repeat request (HARQ) processes for providing HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each HARQ process has an associated data indicator indicating whether an associated downlink transmission comprises an initial transmission of downlink data or a retransmission of previously transmitted downlink data, and wherein the HARQ feedback indicates, for each HARQ process, an acknowledgement / negative acknowledgement of the downlink transmission and an associated data indicator for the downlink transmission; transmitting a downlink transmission set; transmitting downlink control information indicating that the UE will provide a one-time feedback report for at least a subset of the HARQ process set; as well as Receive the one-time feedback report indicating HARQ feedback and associated data indicators for each HARQ process in at least the subset of the set of HARQ processes, wherein in the absence of scheduling information for the associated HARQ processes, a default data indicator is included together with the HARQ feedback for one or more of the HARQ processes.

10. The method of claim 9, wherein the one-time feedback report is transmitted together with an uplink transmission of the UE, and wherein only the one-time feedback report is provided together with the uplink transmission regardless of whether a HARQ reporting timeline of one or more other types of HARQ feedback corresponds to the timing of the uplink transmission.

11. The method of claim 9, wherein the one-time feedback report comprises one or more of an acknowledgement (ACK) indication, a negative acknowledgement (NACK) indication, the data indicator, or a combination thereof, each of which is associated with a corresponding HARQ process of the HARQ process subset.

12. The method of claim 11, wherein the data indicator is a new data indicator (NDI).

13. The method of claim 11, wherein the HARQ process set comprises a plurality of HARQ processes, each HARQ process having a different HARQ process ID.

14. The method of claim 9, wherein the one-time feedback report provides HARQ feedback and an associated data indicator for each HARQ process ID in a plurality of HARQ process IDs, and wherein the HARQ feedback is associated with one or more of a plurality of transport blocks, a plurality of component carriers, a plurality of code block groups, or any combination thereof.

15. The method of claim 9, wherein the default data indicator is reported by the UE for a first feedback process identifier for which the UE has not received scheduling information, the scheduling information indicating that the first feedback process identifier is to be used to indicate feedback for one of the downlink transmissions.

16. The method of claim 15, wherein when scheduling information indicating the first feedback process identity has not been transmitted to the UE, the default data indicator is used as a frozen bit at a polarity decoder to assist in decoding the one-time feedback report.

17. A method as claimed in claim 9, wherein the latest HARQ process in the HARQ process set to be included in the one-time feedback report is determined at least in part based on the timing of downlink control information scheduling the downlink transmission set, the latest downlink transmission that meets the feedback timeline condition, or any combination thereof.

18. An apparatus for wireless communication at a user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to: determining hybrid automatic repeat request (HARQ) feedback associated with a set of HARQ processes for a downlink transmission from a base station, wherein each HARQ process in the set of HARQ processes has an associated data indicator indicating whether the associated downlink transmission comprises an initial transmission of downlink data or a retransmission of previously transmitted downlink data; receiving downlink control information from the base station, the downlink control information indicating that the UE will provide a one-time feedback report for at least a subset of HARQ processes; identifying, for each HARQ process in at least the subset of HARQ processes, associated HARQ feedback, the associated HARQ feedback comprising an acknowledgement / negative acknowledgement indication of a downlink transmission associated with the HARQ process and the associated data indicator, wherein in the absence of scheduling information for the associated HARQ process, a default data indicator is identified as the associated data indicator for one or more HARQ processes; as well as The one-time feedback report including the HARQ feedback and an associated data indicator for each HARQ process in at least the subset of HARQ processes is transmitted to the base station.

19. The apparatus of claim 18, wherein: The instructions are further executable by the processor to cause the apparatus to transmit only the one-time feedback report with an uplink transmission to the base station.

20. The apparatus of claim 18, wherein the one-time feedback report comprises one or more of an acknowledgement (ACK) indication, a negative acknowledgement (NACK) indication, the data indicator, or a combination thereof, each associated with a corresponding HARQ process identification (ID) of the HARQ process subset.

21. The apparatus of claim 20, wherein the data indicator is a new data indicator (NDI), the NDI being included in the one-time feedback report based on a configuration to include NDI information with the HARQ feedback.

22. The apparatus of claim 20, wherein the HARQ process set comprises a plurality of HARQ processes, each HARQ process having a different HARQ process ID.

23. The apparatus of claim 18, wherein the one-time feedback report provides HARQ feedback and an associated data indicator for each HARQ process ID in a plurality of HARQ process IDs, and wherein the HARQ feedback is associated with one or more of a plurality of transport blocks, a plurality of component carriers, a plurality of code block groups, or any combination thereof.

24. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to: A codebook associated with the HARQ feedback for at least the subset of HARQ processes to be reported in the one-time feedback report is identified.

25. An apparatus for wireless communication at a base station, comprising: processor, a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to: configuring a user equipment (UE) to have a set of hybrid automatic repeat request (HARQ) processes for providing HARQ feedback indicating successful or unsuccessful reception of one or more downlink transmissions at the UE, wherein each HARQ process has an associated data indicator indicating whether an associated downlink transmission comprises an initial transmission of downlink data or a retransmission of previously transmitted downlink data, and wherein the HARQ feedback indicates, for each HARQ process, an acknowledgement / negative acknowledgement of the downlink transmission and the associated data indicator of the downlink transmission; transmitting a downlink transmission set; transmitting downlink control information indicating that the UE will provide a one-time feedback report for at least a subset of the HARQ process set; as well as Receive the one-time feedback report indicating HARQ feedback and associated data indicators for each HARQ process in at least the subset of the set of HARQ processes, wherein in the absence of scheduling information for the associated HARQ processes, a default data indicator is included together with the HARQ feedback for one or more of the HARQ processes.

26. The apparatus of claim 25, wherein the one-time feedback report is transmitted together with an uplink transmission of the UE, and wherein only the one-time feedback report is provided together with the uplink transmission regardless of whether a HARQ reporting timeline of one or more other types of HARQ feedback corresponds to the timing of the uplink transmission.

27. The apparatus of claim 25, wherein the one-time feedback report comprises one or more of an acknowledgement (ACK) indication, a negative acknowledgement (NACK) indication, the data indicator, or a combination thereof, each associated with a corresponding HARQ process of the subset of HARQ processes.

28. The apparatus of claim 27, wherein the data indicator is a new data indicator (NDI).

29. The apparatus of claim 27, wherein the HARQ process set comprises a plurality of HARQ processes, each HARQ process having a different HARQ process ID.

30. The apparatus of claim 25, wherein the one-time feedback report provides HARQ feedback and an associated data indicator for each HARQ process ID in a plurality of HARQ process IDs, and wherein the HARQ feedback is associated with one or more of a plurality of transport blocks, a plurality of component carriers, a plurality of code block groups, or any combination thereof.

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