Techniques for determining a group identifier and a downlink assignment index for an enhanced dynamic codebook

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive one or more downlink control information (DCI) messages scheduling downlink transmissions associated with different groups, where feedback for the downlink transmissions may be sent within the same time period. The UE may index the received DCI messages based on a set of a serving cell index and a monitoring occasion index, and the UE may select a DCI message from the indexed DCI messages. The UE may identify a first DCI message having a format including a group index field based on the index associated with the DCI message. The UE may identify a group index value indicating a first group from the group index field of the identified DCI message, and the UE may send a feedback message including at least a codebook based on the group index value.

Description

[0001] Cross-reference

[0002] This patent application claims the benefit of the following applications: U.S. Provisional Patent Application No. 63 / 007,837, filed Apr. 9, 2020, by Khoshnevisan et al. and entitled "TECHNIQUES FOR DETERMINING GROUP IDENTIFICATION AND A DOWNLINK ASSIGNMENT INDEX FOR ENHANCED DYNAMIC CODEBOOKS"; and U.S. Patent Application No. 17 / 196,529, filed Mar. 9, 2021, by Khoshnevisan et al. and entitled "TECHNIQUES FOR DETERMINING GROUP IDENTIFICATION AND A DOWNLINK ASSIGNMENT INDEX FOR ENHANCED DYNAMIC CODEBOOKS"; each of the above applications is assigned to the assignee of the present application. Field of the Invention

[0003] The following relates to wireless communications, and more particularly, to techniques for determining group identification and a downlink assignment index for enhanced dynamic codebooks. Background of the Invention

[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 are capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multi-access systems include fourth generation (4G) systems (e.g., Long Term Evolution (LTE) systems, Advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multi-access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices (which may alternatively be referred to as user equipment (UE)).

[0005] In some wireless communication systems, a UE and a base station may use error correction techniques (such as hybrid automatic repeat request (HARQ) feedback) for communication between devices. HARQ feedback may be used to identify and correct errors in transmitted data, where the feedback may include an acknowledgement (ACK) or a negative acknowledgement (NACK). In some cases, the UE may send feedback for one or more groups of downlink transmissions from the base station. However, when the UE generates its feedback, the availability of various parameters associated with one or more groups may result in a certain ambiguity and / or complexity. SUMMARY OF THE INVENTION

[0006] The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for determining group identities and downlink assignment indices for enhanced dynamic codebooks. The described techniques enable a UE to accurately generate feedback for one or more groups of downlink transmissions. For example, a wireless communication system may support codebook-based hybrid automatic repeat request (HARQ) feedback (e.g., HARQ using an enhanced dynamic codebook). In such a system, the UE may send the number of information bits within a HARQ acknowledgement (ACK) codebook to the base station. For example, the UE may monitor downlink control information (DCI) during one or more monitoring occasions, where the control information may indicate one or more scheduled downlink transmissions for the UE (e.g., including data transmitted via the physical downlink shared channel (PDSCH)). The UE may use corresponding information bits (e.g., feedback bits such as ACK bits or negative acknowledgement (NACK) bits) to indicate whether each downlink transmission has been successfully detected and received (e.g., decoded). Additionally, different downlink transmissions may be associated with different groups (e.g., a first scheduled PDSCH may be associated with a first PDSCH group, a second scheduled PDSCH may be associated with a second PDSCH group, etc.), and the DCI may indicate which group the scheduled downlink transmission is associated with. The UE may accordingly report feedback for the downlink transmission for the first group (e.g., one or more information bits in a first codebook) and feedback for the downlink transmission for the second group (e.g., one or more information bits in a second codebook). Furthermore, feedback for multiple downlink transmissions for one or more groups may be sent (e.g., via the physical uplink control channel (PUCCH)) during the same time period (e.g., during the same time slot).

[0007] The UE can use rules to determine a group associated with one or more downlink transmissions. For example, the UE can receive one or more DCI messages scheduling downlink transmissions for respective groups, where the DCI messages can have the same or different formats (e.g., from a set of DCI formats). Based on an index associated with each respective DCI message of the received DCI messages, the UE can select the last DCI message that includes a group index field (e.g., based on the format of the DCI message). For example, the UE can index the received DCI messages across serving cell indexes and for the same monitoring occasion (e.g., in ascending order), and the UE can also index the received DCI messages across monitoring occasion indexes (e.g., in ascending order). In such a case, the UE can select the last DCI message based on the index (or sorting) performed by the UE.

[0008] The group index field can provide the UE with a group index value of a first group for generating a codebook associated with the first group. Then, the UE can send a feedback message including at least the codebook associated with the downlink transmission for the first group. In some aspects, the UE can also identify a total downlink assignment index (DAI) value for another group based on the identified group index. As an example, the UE can identify the total DAI value for a non-scheduled group (e.g., a second group scheduled by another DCI message different from the selected DCI message) based on the value of the group index. Here, when generating the codebook for the second group to be sent in the feedback message, the UE can use the total DAI value from the selected DCI message (e.g., the last DCI message including the group index field), or the UE can use a null value for the total DAI value.

[0009] A method for wireless communication is described. The method can include: receiving one or more DCI messages scheduling one or more downlink transmission groups, where a feedback message for the one or more downlink transmissions will be sent during the same time period; identifying a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message; identifying, from the group index field of the first DCI message, a group index value indicating a first group from the one or more downlink transmission groups; and sending, during the same time period, the feedback message for the one or more downlink transmission groups, the feedback message being based on the identified group index value.

[0010] Describes an apparatus for wireless communication. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to perform the following operations: receive one or more DCI messages scheduling one or more downlink transmission groups, wherein feedback messages for one or more downlink transmissions will be sent during the same time period; identify a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message; identify a group index value indicating a first group from the one or more downlink transmission groups from the group index field of the first DCI message; and send the feedback messages for the one or more downlink transmission groups during the same time period, the feedback messages being based on the identified group index value.

[0011] Describes another apparatus for wireless communication. The apparatus may include: a unit for receiving one or more DCI messages scheduling one or more downlink transmission groups, wherein feedback messages for one or more downlink transmissions will be sent during the same time period; a unit for identifying a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message; a unit for identifying a group index value indicating a first group from the one or more downlink transmission groups from the group index field of the first DCI message; and a unit for sending the feedback messages for the one or more downlink transmission groups during the same time period, the feedback messages being based on the identified group index value.

[0012] Describes a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions executable by a processor to perform the following operations: receive one or more DCI messages scheduling one or more downlink transmission groups, wherein feedback messages for one or more downlink transmissions will be sent during the same time period; identify a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message; identify a group index value indicating a first group from the one or more downlink transmission groups from the group index field of the first DCI message; and send the feedback messages for the one or more downlink transmission groups during the same time period, the feedback messages being based on the identified group index value.

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: identifying a total DAI value for a second group that may be different from the first group based on a group index value identified from the first DCI message, wherein the feedback message may be based on the identified total DAI value for the second group.

[0014] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying the total DAI value for the second group may include operations, features, units, or instructions for: determining that the first group includes a first predetermined group based on the identified group index value; receiving a second DCI message that does not include the group index field according to the format of the second DCI message, wherein the second DCI message may be after the first DCI message; and setting the total DAI value for the second group to a first value based on the determination.

[0015] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first value includes a blank value or a null value.

[0016] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: generating a second codebook for the second group using the counter DAI value of the second DCI message based on setting the total DAI value to the blank value or the null value, wherein the feedback message includes the second codebook.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying the total DAI value for the second group may include operations, features, units, or instructions for: determining that the first group includes a second predetermined group based on the identified group index value; and identifying the total DAI value from the first DCI message based on the determination.

[0018] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying the total DAI value for the second group may include operations, features, units, or instructions for: receiving a second DCI message that does not include the group index field according to the format of the second DCI message, wherein the second DCI may be after the first DCI message; and identifying the total DAI value from the first DCI message based on the second DCI message not including the group index field.

[0019] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying the total DAI value for the second group may include operations, features, units, or instructions for performing the following: identifying the total DAI value from the first DCI message based on the format of the first DCI message.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for performing the following: indexing one or more received DCI messages in a first ascending order across a set of serving cell indices for the same monitoring occasion; and indexing one or more received DCI messages in a second ascending order across a set of monitoring occasion indices based on the first ascending order.

[0021] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, receiving the one or more DCI messages may include operations, features, units, or instructions for performing the following: receiving a second DCI message that does not include the group index field according to the format of the second DCI message, wherein the first DCI message may be selected based on the second DCI message not including the group index field.

[0022] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the format of the second DCI message includes a fallback DCI format.

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the format of the second DCI message includes a non-fallback DCI format that does not include the group index field.

[0024] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, receiving the one or more DCI messages may include operations, features, units, or instructions for performing the following: receiving a third DCI message that includes the group index field according to the format of the third DCI message, wherein the first DCI message may be selected based on the first DCI message being after the third DCI message.

[0025] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for performing the following: determining based on the indexing that the first DCI message may be the last DCI message that includes the group index field.

[0026] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: identifying from the first DCI message: a value of a first new feedback indication field for the first group, a number of requested groups, a value of a second new feedback indication field for a second group that may be different from the first group, or a combination thereof.

[0027] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first codebook for the first group and a second codebook for a second group that may be different from the first group are generated based on one or more fields of the first DCI message, wherein the feedback message includes the first codebook, the second codebook, or a combination thereof.

[0028] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, each DCI message among the one or more DCI messages may have a DCI format from a set of DCI formats.

[0029] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the format of the first DCI message includes a non-backoff DCI format. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Examples of wireless communication systems are shown that support techniques for determining group identifiers and downlink assignment indices (DAIs) for enhanced dynamic codebooks in accordance with various aspects of the present disclosure.

[0031] Figure 2 Examples of wireless communication systems are shown that support techniques for determining group identifiers and DAIs for enhanced dynamic codebooks in accordance with various aspects of the present disclosure.

[0032] Figure 3 Examples of feedback schemes are shown that support techniques for determining group identifiers and DAIs for enhanced dynamic codebooks in accordance with various aspects of the present disclosure.

[0033] Figure 4 Examples of feedback schemes are shown that support techniques for determining group identifiers and DAIs for enhanced dynamic codebooks in accordance with various aspects of the present disclosure.

[0034] Figure 5 Examples of feedback schemes are shown that support techniques for determining group identifiers and DAIs for enhanced dynamic codebooks in accordance with various aspects of the present disclosure.

[0035] Figure 6Illustrates an example of a feedback scheme that supports techniques for determining a group identifier and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure.

[0036] Figure 7 and 8 Illustrates a block diagram of an apparatus that supports techniques for determining a group identifier and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure.

[0037] Figure 9 Illustrates a block diagram of a communication manager that supports techniques for determining a group identifier and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure.

[0038] Figure 10 Illustrates a diagram of a system that includes an apparatus that supports techniques for determining a group identifier and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure.

[0039] Figure 11 and 12 Illustrates a flowchart of a method that supports techniques for determining a group identifier and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0040] In some wireless communication systems, a user equipment (UE) may use hybrid automatic repeat request (HARQ) feedback to ensure reception of data transmitted within the system. For example, the UE may send an HARQ feedback transmission that includes an acknowledgment (ACK) or negative acknowledgment (NACK) for data sent to the UE. In some cases, a flexible frame structure and dynamic indication of HARQ feedback timing may be used. Thus, the time offset between receiving a downlink message (e.g., physical downlink shared channel (PDSCH), physical downlink control channel (PDCCH)) and sending a corresponding HARQ feedback may be variable. The system may also utilize codebook-based HARQ feedback, where multiple HARQ feedback indicators (e.g., ACK / NACK) may be sent simultaneously on a single feedback occasion (e.g., within a feedback report), and the corresponding information bits representing detected messages may be encoded in an HARQ-ACK codebook.

[0041] In some cases, the UE may send different types of HARQ-ACK codebooks. For example, a semi-static codebook may be used, where HARQ feedback bits for potential downlink messages may be reserved in a semi-static codebook (e.g., having a fixed size, independent of the actual transmission of downlink messages). Additionally or alternatively, a dynamic codebook may be used, where information bits may be conditionally added to the codebook based on, for example, the detection of a downlink message (e.g., a downlink control information (DCI) message). Here, the UE may construct a codebook having a size corresponding to the number of detected downlink transmissions and the corresponding information bits included in the HARQ-ACK codebook, which may reduce the overhead in the feedback signaling.

[0042] In some examples, one or more downlink transmissions sent from the base station may be configured or organized into groups. In such examples, the UE may be configured to provide group-based HARQ feedback to the base station, which may enable efficient communication in a wireless communication system. The group-based feedback may also be referred to as enhanced dynamic acknowledgment feedback, and the group-based acknowledgment feedback codebook may be referred to as an enhanced dynamic codebook. Using such a codebook-based HARQ feedback scheme, the UE may determine the feedback for each downlink transmission group. For example, the UE may identify a first feedback (e.g., a first HARQ-ACK codebook) for a first group, a second feedback (e.g., a second HARQ-ACK codebook) for a second group, etc. Such feedback may include an indication of whether the UE has successfully received and decoded one or more downlink transmissions for each group (e.g., an ACK indicating successful decoding of a downlink transmission or a NACK indicating a failed reception or failed decoding of a downlink transmission). In some cases, the DCI received by the UE may provide a set of parameters for the UE to generate one or more codebooks. For example, the DCI may include a group index field identifying the group of scheduled downlink transmissions and a downlink assignment index (DAI) field (e.g., such as a counter DAI and a total DAI) that may take into account the number of downlink transmissions (e.g., for each group). Additionally, a new feedback indicator (NFI) may switch whether to reset the DAI for a group, which may indicate which information is included in the generated codebook. In some examples, based on the configuration provided to the UE (e.g., a radio resource control (RRC) configuration), one or more fields within the DCI (such as the NFI for a non-scheduled group (i.e., a group scheduled by another DCI but for which the UE may provide feedback) and the total DAI for a non-scheduled group) may be present or absent.

[0043] However, in some cases, when a UE receives various DCI formats scheduling downlink communication groups, it may be complex to use an enhanced dynamic codebook to report HARQ feedback for different downlink transmission groups, or it may lead to a certain degree of ambiguity in the feedback process, or both. For example, some DCI formats (e.g., non-backoff DCI such as DCI format 1_1) may include various fields for the group scheduled by the DCI, such as DAI, NFI, group index, etc., and one or more fields for another (e.g., non-scheduled) group. However, some DCI formats (e.g., backoff DCI such as DCI format 1_0 or other non-backoff DCI formats such as DCI format 1_2) may not include these fields. Therefore, when the UE is configured with an enhanced dynamic codebook, based on the format of the received DCI, the UE can report feedback based on various assumptions related to the corresponding PDSCH (e.g., using pre-configured rules or the last received DCI). As an example, for a PDSCH scheduled by a backoff DCI, the UE can report HARQ feedback for the PDSCH that is part of a predetermined group (e.g., group 0). In addition, the UE may receive another DCI that includes an indicator associated with one or more groups (e.g., in the NFI field corresponding to parameter h), and the UE can utilize the indicator in the received another DCI when determining the HARQ codebook. Based on the assumptions made by the UE, it may be required that the UE consider one group as the latest group, and if feedback for another group is also requested (e.g., when the requested PDSCH group count field corresponding to parameter q indicates multiple groups), the UE can multiplex the feedback for the two groups when sending the feedback message (e.g., via the physical uplink control channel (PUCCH)). However, when multiple downlink transmissions (and DCI messages) are received, it may be ambiguous which group can be considered the latest group. Additionally, if the most recently received DCI is formatted as a backoff DCI, various fields for generating feedback / codebooks for multiple groups may not be provided to the UE. In some cases, it may also be unclear to the UE when to use information associated with different groups being reported (such as the total DAI value for a non-scheduled group), which may be more complex in the case where the last (e.g., most recently received) DCI is a backoff DCI.

[0044] As described herein, various techniques can be used to implement group determination for reporting HARQ feedback, where rules can be used to determine the last group g for which a codebook can be generated. The rules can include identifying a set of DCI messages that schedule PDSCH reception, for which corresponding HARQ feedback will be sent in the same time interval (e.g., via PUCCH during the same time slot). In some examples, DCI messages can be indexed (e.g., in ascending order) across serving cell indices for the same PDCCH monitoring occasion, and then across PDCCH monitoring occasion indices (e.g., in ascending order). Additionally, the rules can include: selecting the last DCI message from the set of received DCI messages that includes a PDSCH group index field (such as included in DCI format 1_1) based on the index (or ordering) associated with each respective DCI message, and the UE can set the last group g to the value of the group index field in the selected DCI. Based on the value of g, the UE can generate a HARQ-ACK codebook for the corresponding group, which can be included in a feedback message to the base station for one or more groups.

[0045] The described techniques also provide determining the total DAI value for non-scheduled PDSCH groups (e.g., groups different from the PDSCH groups scheduled by received DCI). Here, the UE can use the rules described herein to identify the last group, and then can determine the total DAI value for another group (e.g., group (g + 1) mod 2, non-scheduled group) based on the identified group g. Specifically, if the group identified from the rules is, for example, group 0, the UE can utilize the total DAI value indicated by the selected DCI when generating the corresponding HARQ-ACK codebook. In other cases, if the group identified from the described rules is, for example, group 1, the UE can set the total DAI for the non-scheduled group to a blank or null value (e.g., ). In any case, the UE can use the group index value determined according to the above techniques to generate one or more HARQ-ACK codebooks included in the feedback message sent to the base station.

[0046] Aspects of the present disclosure are first described in the context of a wireless communication system. Then aspects of the present disclosure are described with reference to various examples of feedback schemes. Further aspects of the present disclosure are illustrated and described with reference to diagrams of apparatuses, system diagrams, and flowcharts related to techniques for determining group identification and DAI for an enhanced dynamic codebook.

[0047] Figure 1FIG. 0 shows an example of a wireless communication system 100 that supports techniques for determining group identifiers and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an evolved LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0048] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be devices of different forms or having different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110, and the UEs 115 and the base stations 105 may establish one or more communication links 125 over the coverage area 110. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support the transmission of signals in accordance with one or more radio access technologies.

[0049] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices of different forms or having different capabilities. Some example UEs 115 are shown in Figure 1 . The UEs 115 described herein are capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), as Figure 1 shown.

[0050] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate directly (e.g., directly between base stations 105) with each other, or indirectly (e.g., via the core network 130) with each other, or both, over the backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, the backhaul links 120 may be or include one or more wireless links.

[0051] One or more of the base stations 105 described herein may include or may be referred to by those of ordinary skill in the art as a base station transceiver, radio base station, access point, radio transceiver, Node B, evolved Node B (eNB), next generation Node B or Gigabit Node B (any of which may be referred to as a gNB), home Node B, home evolved Node B, or some other suitable term.

[0052] The UE 115 may include or may be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, where the "device" may also be referred to as a unit, station, terminal or client, among other examples. The UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer or personal computer. In some examples, the UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine type communication (MTC) device, among other examples, which may be implemented in various items such as appliances, or vehicles, meters, and other examples.

[0053] The UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s that can sometimes act as repeaters, as well as base stations 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as Figure 1 shown.

[0054] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 over one or more carriers. The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP)) that operates according to one or more physical layer channels of a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating the operation of the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. According to a carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0055] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be placed according to a channel raster for discovery by the UE 115. A carrier may operate in stand-alone mode, where the UE 115 performs initial acquisition and connection via the carrier, or the carrier may operate in non-stand-alone mode, where a different carrier (e.g., of the same or different radio access technology) is used to anchor the connection.

[0056] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105 or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communication (e.g., in FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0057] A carrier may be associated with a 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 the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of determined bandwidths for carriers of a radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (e.g., the base station 105, the UE 115, or both) may have a hardware configuration that supports communication on the carrier bandwidth or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a sub-band, a BWP) or all of the carrier bandwidth.

[0058] The signal waveform transmitted on a carrier can be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread spectrum OFDM (DFT-S-OFDM)). In a system employing an MCM technique, a resource element can include a symbol period (e.g., the duration of a modulated symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate can be for UE 115. Wireless communication resources can refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity for communication with UE 115.

[0059] One or more numerology for a carrier can be supported, where the numerology can include a subcarrier spacing (Δf) and a cyclic prefix. The carrier can be divided into one or more BWPs with the same or different numerology. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier is active at a given time, and the communication for UE 115 can be restricted to one or more active BWPs.

[0060] The time interval for the base station 105 or UE 115 can be represented as a multiple of a basic time unit (which can be, for example, referred to as T s = 1 / (Δf max ·N f )) seconds, where Δf max can represent the maximum supported subcarrier spacing, and N f can represent the maximum supported discrete Fourier transform (DFT) size). The time intervals of the communication resources can be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0061] Each frame may include a plurality of consecutively numbered sub - frames or time slots, and each sub - frame or time slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into sub - frames, and each sub - frame may be further divided into a plurality of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the sub - carrier spacing. Each time slot may include a plurality of symbol periods (e.g., depending on the length of the cyclic prefix added in front of each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini - slots each containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f f

[0062] sub - frames, time slots, mini - slots, or symbols may be the smallest scheduling units (e.g., in the time domain) of the wireless communication system 100 and may be referred to as transmission time intervals (TTIs). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0063] Physical channels may be multiplexed on a carrier according to various techniques. For example, time - division multiplexing (TDM) techniques, frequency - division multiplexing (FDM) techniques, or one or more of hybrid TDM - FDM techniques may be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region for a physical control channel (e.g., a control resource set (CORESET)) may be defined by a plurality of symbol periods and may extend over the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the coded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to a plurality of UEs 115 and a UE - specific search space set for sending control information to a particular UE 115.

[0064] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity for communicating (e.g., on a carrier) with base station 105 and may be associated with an identifier (e.g., physical cell identifier (PCID), virtual cell identifier (VCID), or other identifier) for differentiating adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion (e.g., sector) of the geographic coverage area 110 on which the logical communication entity operates. Depending on various factors (such as the capabilities of base station 105), the range of such a cell may vary from a relatively small area (e.g., a structure, a subset of a structure) to a relatively large area. For example, a cell may be or may include a building, a subset of a building, or an exterior space between or overlapping with geographic coverage areas 110, among other examples.

[0065] For example, a macro cell covers a relatively large geographic area (e.g., with a radius of several kilometers) and may allow unrestricted access by UEs 115 having a service subscription with the network provider that supports the macro cell. Compared to a macro cell, a small cell may be associated with a lower-power base station 105, and the small cell may operate in the same or a different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to UEs 115 having a service subscription with the network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a residence or office). Base station 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0066] In some examples, a carrier may support multiple cells and may be configured with different cell types according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access for different types of devices.

[0067] In some examples, base station 105 can be movable, and thus, provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, but different geographic coverage areas 110 can be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies can be supported by different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous network, where different types of base stations 105 use the same or different radio access technologies to provide coverage for respective geographic coverage areas 110.

[0068] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timings, and transmissions from different base stations 105 can be approximately aligned in time. For asynchronous operation, base stations 105 can have different frame timings, and in some examples, transmissions from different base stations 105 can not be aligned in time. The techniques described herein can be used for synchronous or asynchronous operation.

[0069] Some UEs 115 (e.g., MTC or IoT devices) can be low-cost or low-complexity devices, and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC can include communication from devices integrated with sensors or meters to measure or capture information and relay such information to a central server or application, which utilizes the information or presents the information to a human who interacts with the application. Some UEs 115 can be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, device monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business billing.

[0070] Some UEs 115 may be configured to operate in a power-reduced mode of operation, e.g., half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UE 115 include entering a power-saving deep sleep mode when not participating in active communication, when operating on a limited bandwidth (e.g., according to narrowband communication), or in combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type associated with a defined portion or extent (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of the carrier, or external to the carrier.

[0071] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. The UE 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication and may be supported by one or more mission-critical services such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0072] In some examples, the UE 115 is also capable of communicating directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, multiple groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system where each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0073] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as a roadside unit), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or communicate with both.

[0074] The core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), which can include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity that routes or interconnects packets to an external network (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for a UE 115 served by a base station 105 associated with the core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can be connected to a network operator IP service 150. The operator IP service 150 can include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet-switched streaming services.

[0075] Some network devices in the network (e.g., base station 105) can include subcomponents such as an access network entity 140, which can be an example of an access node controller (ANC). Each access network entity 140 can communicate with a UE 115 through one or more other access network transmission entities 145 (which can be referred to as a radio head, a smart radio head, or a transmit / receive point (TRP)). Each access network transmission entity 145 can include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 can be distributed across various network devices (e.g., radio head and ANC) or combined into a single network device (e.g., base station 105).

[0076] The wireless communication system 100 may operate using one or more frequency bands (e.g., in the range of 300 megahertz (MHz) to 300 gigahertz (GHz)). The region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or the decimeter band because the wavelength range is approximately from one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may be sufficient to penetrate structures for a macro cell to serve a UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, UHF wave transmissions may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers).

[0077] 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 referred to as the centimeter band) or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as the millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be even smaller and more closely spaced compared to UHF antennas. In some examples, this may facilitate the use of antenna arrays within the devices. However, EHF transmissions may suffer even greater atmospheric attenuation and shorter distances compared to SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the designation of the use of frequency bands across these frequency regions may vary according to the country or regulatory authority.

[0078] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed-assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices (such as the base station 105 and the UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in an unlicensed frequency band may be based on a carrier aggregation configuration that combines component carriers operating in a licensed frequency band (e.g., LAA). Operation in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer (P2P) transmissions, or device-to-device (D2D) transmissions, among other examples.

[0079] 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. The antennas of the base station 105 or the UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communication with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0080] The base station 105 or the UE 115 may use MIMO communication to exploit multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0081] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., base station 105, UE 115) to form or direct an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via the antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signals transmitted via the antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with the device. The adjustment associated with each antenna element in the antenna array can be defined by a set of beamforming weights associated with an orientation (e.g., relative to the antenna array of the transmitting device or receiving device, or relative to some other orientation).

[0082] As part of the beamforming operation, the base station 105 or the UE 115 can use beam scanning techniques. For example, the base station 105 can use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. The base station 105 can transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 can transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions can be used (e.g., by the transmitting device such as the base station 105 or by the receiving device such as the UE 115) to identify the beam direction for subsequent transmissions or receptions performed by the base station 105.

[0083] The base station 105 can transmit some signals (e.g., data signals associated with the receiving device) in a single beam direction (e.g., the direction associated with the receiving device (e.g., UE 115)). In some examples, the beam direction associated with the transmission along a single beam direction can be determined based on signals transmitted in one or more beam directions. For example, the UE 115 can receive one or more of the signals transmitted by the base station 105 in different directions and can report to the base station 105 an indication of the signal that has the highest signal quality or otherwise acceptable signal quality received by the UE 115.

[0084] In some examples, multiple beam directions can be used to perform transmissions by a device (e.g., by base station 105 or UE 115), and the device can use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from base station 105 to UE 115). UE 115 can report feedback indicating precoding weights for one or more beam directions, and the feedback can correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 can transmit reference signals that can be precoded or not precoded (e.g., cell-specific reference signal (CRS), channel state information reference signal (CSI-RS)). UE 115 can provide feedback for beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 can employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmissions or receptions by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0085] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, a receiving device (e.g., UE 115) can attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device can attempt multiple receiving directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (e.g., different sets of directional listening weights), or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (any of the above operations can be referred to as "listening" according to different receiving configurations or receiving directions). In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receiving configuration can be aligned in a beam direction determined based on listening according to different receiving configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0086] The wireless communication system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly for transmission over logical channels. The media access control (MAC) layer can perform priority handling and multiplexing of logical channels into transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between the UE 115 and the base station 105 or the core network 130. At the physical layer, the transport channels can be mapped to physical channels.

[0087] The UE 115 and the base station 105 can support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received over the communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions). In some examples, the device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in previous symbols in a particular slot in that slot. In some other cases, the device can provide HARQ feedback in a subsequent slot or according to some other time interval.

[0088] The wireless communication system 100 may support enabling the UE 115 to accurately generate feedback for one or more sets of downlink transmissions. For example, the wireless communication system may support codebook-based HARQ feedback (e.g., HARQ using an enhanced dynamic codebook). In such a system, the UE 115 may send the number of information bits within the HARQ-ACK codebook to the base station 105. As an example, the UE 115 may monitor DCI during one or more monitoring occasions, where the control information may indicate one or more scheduled downlink transmissions for the UE 115 (e.g., including data sent via the PDSCH). The UE 115 may use the corresponding information bits (e.g., feedback bits such as ACK bits or NACK bits) to indicate whether each downlink transmission has been successfully detected and received (e.g., decoded). Additionally, different downlink transmissions may be associated with different sets (e.g., the first scheduled PDSCH may be associated with the first set, the second scheduled PDSCH may be associated with the second set, etc.), and the DCI may indicate which set the scheduled downlink transmission is associated with (e.g., the DCI may include a set index value in a set index field). The UE 115 may accordingly report feedback for the downlink transmissions of the first set (e.g., one or more information bits in the first codebook) and feedback for the downlink transmissions of the second set (e.g., one or more information bits in the second codebook). Further, feedback for multiple downlink transmissions of one or more sets may be sent (e.g., via the PUCCH) during the same time period (e.g., during the same time slot).

[0089] The UE 115 may utilize rules to determine a group associated with one or more downlink transmissions. For example, the UE 115 may receive one or more DCI messages scheduling downlink transmissions for respective groups, where the DCI messages may have the same or different formats (e.g., from a set of DCI formats). In some cases, the UE 115 may index the received DCI messages across serving cell indices and for the same monitoring occasion (e.g., in ascending order), and the UE 115 may also index the received DCI messages across monitoring occasion indices (e.g., in ascending order). Based on the indexing (or sorting) of the DCI messages, or based on indices associated with one or more DCI messages, the UE 115 may select the last DCI message that includes a group index field. The group index field may provide the UE 115 with a group index value for a first group for generating a codebook associated with the first group. Then, the UE 115 may send a feedback message including at least the codebook associated with the downlink transmission for the first group. In some aspects, the UE 115 may also identify a total DAI (tDAI) value (e.g., tDAI’) for another group based on the identified group index. As an example, the UE 115 may identify the total DAI value for an unscheduled group (e.g., a second group scheduled by another DCI message different from the selected DCI message) based on the value of the group index. Here, when generating a codebook for the second group to be sent within the feedback message, the UE 115 may utilize the total DAI value (e.g., tDAI’) from the selected DCI message (e.g., the last DCI message including the group index field), or the UE 115 may use a null value (e.g., ) for the total DAI value.

[0090] Figure 2 FIG. shows an example of a wireless communication system 200 supporting techniques for determining group identification and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 includes a UE 215 and a base station 205, which may be examples of the UE 115 and the base station 105 described with reference to Figure 1 . The wireless communication system 200 may implement various feedback schemes as described herein, which may enable one or more wireless devices (e.g., the UE 215) to more reliably and efficiently determine values for generating HARQ codebooks included in feedback messages, among other advantages.

[0091] In some cases, the UE 215 and the base station 205 may communicate using one or more downlink transmissions 207 and feedback transmissions 210. For example, the UE 215 may monitor DCI during one or more monitoring occasions, where the control information may indicate one or more scheduled downlink transmissions 207 for the UE 215 (e.g., including data sent via the PDSCH). The DCI may include scheduling information corresponding to one or more data transmissions. The UE 215 may receive data sent by the base station 205 and may send a feedback transmission 210. In some cases, the downlink transmission 207 may include one or more downlink messages 217, and the feedback transmission 210 may include HARQ feedback 220 corresponding to one or more downlink messages 217 (e.g., including one or more dynamic HARQ-ACK codebooks).

[0092] According to some aspects, the UE 215 may send HARQ feedback to the base station 205. For example, the base station 205 may send a data transmission (e.g., downlink message 217) to the UE 215 on the PDSCH. The UE 215 may use the HARQ feedback to ensure the reception of the sent data. For example, the UE 215 may send a HARQ feedback transmission (e.g., HARQ feedback 220) including an ACK or NACK for one or more data transmissions (e.g., one or more PDSCH transmissions). In such cases, the UE 215 may monitor the PDCCH during one or more monitoring occasions (e.g., a period during which the UE 215 monitors a resource set to identify data sent from the base station 205 to the UE 215).

[0093] In some cases, the wireless communication system 200 may use codebook-based HARQ feedback. For example, a HARQ-ACK codebook including multiple HARQ information bits (e.g., ACK / NACK for corresponding downlink messages 217) may be sent simultaneously on a single feedback occasion, where the HARQ feedback bits may include the HARQ-ACK codebook.

[0094] In some cases, the UE 215 may send different types of HARQ-ACK codebooks. For example, a semi-static codebook may be used, where HARQ feedback bits may be reserved in a semi-static codebook of a fixed size (e.g., regardless of whether a PDSCH transmission occurs). Additionally or alternatively, a dynamic codebook may be used. In such cases, HARQ feedback bits may be conditionally added to the feedback message (i.e., the feedback transmission). For example, if a downlink message (such as a DCI message or a PDSCH transmission) is detected, HARQ feedback bits may be added or reserved in the dynamic codebook. Here, the UE 215 may construct a codebook for transmission based on the detection of the PDSCH transmission (e.g., where, if a transmission is detected, the information bits may only be included in the HARQ-ACK codebook). In some cases, the UE 215 may detect the PDSCH transmission by blindly decoding the PDCCH having the PDSCH allocation. In other cases, the UE 215 may detect the PDCCH that releases the semi-persistently scheduled PDSCH. In such cases, the PDCCH that releases the semi-persistently scheduled PDSCH may not involve the transmission of the PDSCH, but the UE 215 may send an ACK to confirm the detection of the PDCCH. In other cases, the UE 215 may detect the PDSCH transmission by detecting the semi-persistent PDSCH. In any case, such a dynamic codebook may reduce the codebook size and may reduce the feedback overhead.

[0095] In some examples, the UE 215 may implement feedback for one or more groups of downlink transmissions (e.g., the downlink message 217). For example, different PDSCH transmissions may be configured (e.g., by the base station 205) to be included in different groups. The base station 205 may indicate (e.g., via the downlink transmission 207) to the UE 215 in the corresponding DCI message the configuration for each PDSCH transmission. Thus, the UE 215 may use the corresponding information bits within one or more codebooks to indicate whether the data transmissions corresponding to one or more groups of data transmissions are successfully received or decoded by the UE 215. In some examples, the UE 215 may generate a HARQ-ACK codebook corresponding to a first group of the downlink message 217 and a second group of the downlink message 217 (e.g., for a CBG-based codebook). Additionally or alternatively, the UE 215 may generate a HARQ-ACK codebook for each group (e.g., a first codebook for the first group and a second codebook for the second group).

[0096] However, in some examples, the process used by UE 215 to determine the group associated with a downlink transmission may be ambiguous or based on multiple assumptions. For example, UE 215 may receive a DCI message (e.g., based on the format of the DCI message) that does not include an indication of the group (e.g., group index field) for the corresponding PDSCH, and UE 215 may make various assumptions when determining the value to use for generating HARQ feedback related to the corresponding PDSCH. As an example, UE 215 may receive a DCI message (e.g., fallback DCI) that may not include a group index field for the PDSCH scheduled by the DCI. UE 215 may accordingly report the corresponding HARQ feedback as part of a predetermined group (e.g., group 0).

[0097] As described in further detail below, to generate HARQ feedback more accurately and efficiently, UE 215 may implement rules for determining the group associated with one or more downlink transmissions. For example, UE 215 may use rules to determine the most recent PDSCH group index value (e.g., corresponding to parameter g) for which a codebook can be generated. The rule may include identifying a set of DCI messages that schedule the reception of the PDSCH for which HARQ feedback will be sent in the same time interval (e.g., via PUCCH during the same time slot). UE 215 may index the DCI messages (e.g., in ascending order). Based on the ordering of the DCI messages, the index associated with the DCI messages, or some combination thereof, UE 215 may sequentially determine and select the last DCI message that includes a group index field. UE 215 may set the value of g to the value of the group index field in the selected last DCI message. Additionally, UE 215 may determine the total DAI value for the non-scheduled PDSCH group (e.g., tDAI’) based on the identified group g. UE 215 may use these determined values when generating the HARQ codebook for the associated group and may send a feedback message that includes the HARQ codebook.

[0098] Figure 3 An example of a feedback scheme 300 that supports techniques for determining group identification and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure is shown. In some examples, feedback scheme 300 may implement aspects of wireless communication system 100 and wireless communication system 200. For example, feedback scheme 300 may illustrate communication between a UE and a base station, where the UE and the base station may be examples of UE 115 (or UE 215) and base station 105 (or base station 205) as described with reference to Figure 1 and Figure 2 respectively. Feedback scheme 300 may enable a wireless device to implement rules for determining values to use when generating an HARQ codebook.

[0099] Feedback scheme 300 may illustrate an example of DCI message 305. For example, DCI message 305-a may be an example of a transmission from base station 105 to UE during a first monitoring occasion (e.g., time slot). In some examples, DCI message 305-b may be an example of a transmission during a second monitoring occasion, or an example of a transmission during the first monitoring occasion (e.g., one or more of DCI messages 305 in DCI message 305 may be sent during the same PDCCH monitoring occasion, e.g., across a serving cell or on different component carriers (CCs)). DCI message 305 may indicate one or more data transmissions corresponding to a first set (e.g., PDSCH transmission 310) or one or more data transmissions corresponding to a second set (e.g., PDSCH transmission 315).

[0100] UE may use PUCCH transmission 320 to send the first feedback 325 or the second feedback 330 (e.g., information bits in one or more HARQ-ACK codebooks), or both. As an example, the first feedback 325 and the second feedback 330 may be multiplexed and sent by UE in PUCCH transmission 320. UE may determine the first feedback 325 or the second feedback 330 based on DCI message 305, the PDSCH transmissions 310 of the first set and the PDSCH transmissions 315 of the second set, or any combination thereof. As an illustrative example, UE may generate the first feedback 325-a based on one or more of DCI messages 305-a to 305-b, PDSCH transmissions 310-a and 310-b. For example, UE may receive one or more parameters in DCI message 305. One or more parameters may include an indication of the next opportunity for PUCCH transmission 320. For example, DCI message 305-a may include a parameter (e.g., K1 = 3 may indicate 3 time slots between DCI message 305-a and PUCCH transmission 320-a) indicating the number of monitoring occasions (e.g., time slots) between DCI message 305-a and PUCCH transmission 320-a).

[0101] Additionally or alternatively, one or more parameters may include one or more DAI. For example, DCI message 305-a may correspond to PDSCH transmission 310-a in the first group of PDSCH transmissions 310. DCI message 305-a may include an indication of the DAI value associated with the scheduled group (e.g., the first group of PDSCH transmissions 310). For example, PDSCH transmission 310-a may be the first transmission in the first group, and the DAI for the first group may be represented as, for example, DAI = 1. In some examples, DCI message 305 may include DAI for different groups. For example, DCI message 305-c may correspond to PDSCH transmission 315-a, and PDSCH transmission 315-a may be the first transmission in the second group of PDSCH transmissions 315. In some cases, feedback for PDSCH transmission 315-a (e.g., based on the K value of DCI message 305-c) may be sent in PUCCH transmission 320-b. DCI message 305-c may include an indication of the last sent value of the DAI for the non-scheduled group (e.g., the first group of PDSCH transmissions 310). For example, the indication of the value of the DAI for the non-scheduled group may be represented by DAI' (e.g., DAI' = 2 in DCI message 305-c). This indication of the most recent DAI value for another group may enable the UE to correctly construct feedback (e.g., first feedback 325-a, first feedback 325-b, second feedback 330), as described herein. The UE may receive PDSCH transmission 310-a of the first group, and DCI message 305-c may indicate a DAI value of 2 for the first group (e.g., DAI' = 2). Thus, the UE may detect the missed DCI message 305-b based on DCI message 305-c. The UE may generate first feedback 325-a to include an entry for the missed DCI message 305-b (e.g., a NACK corresponding to DAI = 2). Additionally or alternatively, the UE may generate first feedback 325-b to include an entry for the missed DCI message 305-b. In some cases, the UE may be configured with multiple component carriers, and the DAI and DAI' values may be the total DAI values for the multiple component carriers (e.g., tDAI and tDAI').

[0102] Additionally or alternatively, one or more parameters may include an indication as to which group the DCI message 305 corresponds. For example, the feedback scheme 300 may include examples of one or more indication fields which, in some cases, may be examples of group index fields corresponding to the parameter g used in generating the feedback. The group index field may indicate the value of the group index (and corresponding PDSCH group) associated with the DCI message and / or PDSCH transmission. In such a case, the parameter g may be set to the value provided by the group index field. For example, a value of 0 in the group index field may indicate that the DCI message 305 corresponds to the PDSCH transmission 310 of the first group, and the UE may accordingly set g = 0. In other examples, a value of 1 in the group index field may indicate that the DCI message 305 corresponds to the PDSCH transmission 315 of the second group, and the UE may accordingly set g = 1. There may also be other examples of values provided by the group index field. In some examples, one or more parameters may include a first NFI field corresponding to the first group (e.g., h = 0 or h = 1) or a second NFI field corresponding to the second group (e.g., h' = 0 or h' = 1), or both. For example, the base station 105 may switch the first NFI field h (e.g., from a value of 0 to 1 or vice versa) to indicate to the UE to restart the counter for the DAI for the first group. Additionally or alternatively, the base station 105 may switch the second NFI field h' (e.g., from a value of 0 to 1 or vice versa) to indicate to the UE to restart the counter for the DAI for the second group.

[0103] In some examples, one or more parameters may include: an indication for the UE to report (e.g., generate and send) the first feedback 325 during the same time period, an indication for the UE to report both the first feedback 325 and the second feedback 330, or both. For example, the HARQ-ACK information request field may correspond to the parameter q in the feedback scheme 300. As shown, if the base station 105 indicates a value of 0 (e.g., where q = 0), the UE may generate and send the first feedback 325-a for the first group and refrain from sending the second feedback 330 for the second group. Additionally or alternatively, if the base station 105 indicates a value of 1 (e.g., where q = 1), the UE may generate and send both the first feedback 325 (e.g., the first feedback 325-b) for the first group and the second feedback 330 (e.g., the second feedback 330-a) for the second group during the same time period (e.g., in the same PUCCH transmission such as the PUCCH transmission 320). In some examples, for example, based on the DCI format or configuration from the base station 105 (e.g., RRC configuration), various parameters described in the feedback scheme 300 may or may not be present in the DCI message 305.

[0104] The UE can identify the first feedback 325 or the second feedback 330 based on the various parameters and communications described herein. For example, the UE can send the first feedback 325-a associated with the first set of PDSCH transmissions 310 to the base station 105 via PUCCH transmission 320-a. In some examples, for instance, since only an indication of the first feedback 325-a is reported for the UE (e.g., represented as q = 0 in the feedback scheme 300), the UE can avoid indicating or generating the second feedback 330 for reporting via PUCCH transmission 320-a. In some examples, the first feedback 325-a can be indicated in a codebook. For example, the UE can determine the information bits (e.g., feedback bits) for each PDSCH transmission 310. If the PDSCH transmission 310 is successfully decoded, the information bits can indicate ACK, and if the PDSCH transmission 310 is not successfully received or decoded, the information bits can indicate NACK. For example, the UE can successfully decode the PDSCH transmission 310-a and fail to receive the first set of PDSCH transmissions 310-b (e.g., the UE may miss the DCI message 305-b). In such an example, the UE can include an ACK for the first entry of the codebook (e.g., corresponding to the DAI being 1) and a NACK for the second entry of the codebook (e.g., corresponding to the DAI being 2), which can enable the base station 105 to retransmit the DCI message 305-b, the PDSCH transmission 310-b, or both.

[0105] As another illustrative example, the UE can identify the first feedback 325-b and the second feedback 330-a for feedback reports sent in the same time period. For example, the UE can include the first feedback 325-b and the second feedback 330-a in the same codebook for two groups, or generate a codebook for each of the first group and the second group. In some examples, the UE can send both the first feedback 325-b for the first group and the second feedback 330-a for the second group in the same time period (e.g., as part of the same PUCCH transmission 320) based on an indication from the base station 105 (e.g., represented as q = 1 in the feedback scheme 300). In other examples, the first feedback 325-b for the first group and the second feedback 330-a for the second group can be included in the same feedback message (e.g., as part of the same PUCCH transmission 320) because the base station 105 did not receive a previous feedback message (e.g., sent via PUCCH transmission 320-a). There may be other scenarios that can result in both the first feedback 325-b for the first group and the second feedback 330-a for the second group being reported together in the same feedback message.

[0106] As described herein, a UE may determine information bits to include in a first feedback 325-a and a second feedback 330-a. The UE may indicate a feedback report to the base station 105 via a PUCCH transmission 320-b. In some examples, the UE may report multiple information bits for each PDSCH transmission.

[0107] In some examples, the UE may not be able to accurately determine values for one or more codebooks used to generate a feedback message. For example, the UE may receive DCI messages 305 in various formats. Some formats (e.g., non-fallback DCI such as DCI format 1_1) may include fields for a PDSCH group (e.g., group 0) scheduled by the DCI and for another (e.g., non-scheduled) PDSCH group (e.g., group 1). However, other formats (e.g., fallback DCI such as DCI format 1_0 or other non-fallback DCI formats such as DCI format 1_2) may not include these fields, and the UE may make various assumptions when determining values for HARQ feedback associated with a corresponding PDSCH. For example, the UE may receive a fallback DCI that may not include a group index field for the PDSCH scheduled by the DCI. Thus, the UE may report the corresponding HARQ feedback as part of a predetermined group (e.g., group 0).

[0108] The UE may implement rules to more accurately and efficiently determine the group associated with one or more downlink transmissions. For example, the UE may use a rule to determine the most recent PDSCH group g (e.g., the value of the group index field) for which a codebook may be generated. The rule may include identifying a set of DCI messages (e.g., DCI messages 305) that schedule PDSCH transmissions (e.g., PDSCH transmission 310) and indicate the same time slot for the UE to send the corresponding HARQ / ACK feedback (e.g., via a PUCCH transmission 320), and for which the UE sends the corresponding HARQ-ACK information in the PUCCH. In some examples, the UE may index (e.g., in ascending order) the DCI messages 305 across serving cells for the same PDCCH monitoring occasion. That is, for the same PDCCH monitoring occasion across serving cells, the detected DCI formats are indexed first in ascending order. In some cases, the UE may also index the DCI messages 305 across PDCCH monitoring occasion indices (e.g., in ascending order).

[0109] The UE can identify the last DCI message 305 including the group index field based on the index associated with one or more DCI messages 305 in the DCI message 305. For example, if the UE indexes the DCI messages 305 and sorts them sequentially (e.g., based on the index), the UE can identify the last DCI message 305 based on the index (or sorting). The UE can set g to the value of the PDSCH group index field in the last DCI format in the DCI format set that includes the group index field. For example, the last DCI message in the sequence can be a DCI message including the group index field (e.g., DCI message 305-b), and the UE can identify the group index value from the group index field of the last DCI message. The UE can set the value of g to be equal to the group index value of the group index field (e.g., g = 0) to generate the corresponding HARQ codebook. As another example, the last DCI message in the sequence can be a fallback DCI message (or another DCI message without a group index field), and the UE can select the next DCI message (e.g., a DCI message with a group index field) as the last DCI message based on, for example, the sorting of the DCI messages. The UE can set the value of g to the group index value identified from the group index field in the selected last DCI message.

[0110] In some cases, once the UE has determined (i.e., identified) the group index value g, the UE can use the parameters indicated in the last DCI message to determine other values. For example, the UE can determine the value of NFI for the first group g (e.g., h = 0 or h = 1), the value of the HARQ-ACK information request field (e.g., q = 0 or q = 1), and the value of NFI for the second group (e.g., h' = 0 or h' = 1). The UE can use these determined values when generating the HARQ codebook for the associated group. That is, the first feedback 325 corresponding to the determined group g and the second feedback 330 corresponding to the second group can be determined based on the determined values. The UE can send a feedback message including the HARQ codebook.

[0111] In some cases, after determining the group index value g, the UE can use rules to determine the total DAI value (e.g., DAI' or tDAI') for another group. That is, the UE can determine the total DAI value for a second group different from the first group g. For example, if the UE identifies that the group index value of the group index field of the last DCI message is equal to 0 (e.g., indicating that the last DCI message is associated with the first group), the UE can set DAI' to the same value indicated in the last DCI message.

[0112] However, in some cases, if there is a DCI message after the last DCI message (e.g., indexed after the last DCI message, received after the last DCI message, sorted after the last DCI message), the value of DAI' indicated in the last DCI message may not be available to the UE. For example, the UE may receive a second DCI message with a DCI format that does not include a group index field, where the second DCI message is indexed after the last DCI message. As an example, there may be a fallback DCI message indexed after the identified last DCI message. Since the fallback DCI message may not include a group index field and / or a group index value, the UE may assume that the fallback DCI belongs to a predetermined group (e.g., group 0). If the selected last DCI message indicates a group index value for a second group (e.g., group 1) such that the UE sets the value of g to be equal to 1, the DAI' value indicated in the selected last DCI message corresponds to the DAI value of the second group. However, this DAI' value may be invalid because the fallback DCI message included in group 0 occurs after the selected last DCI message, and thus, this DAI' value may not be considered in the DAI' value indicated in the selected last DCI message. In this case, the UE may set the DAI' value to a null value (e.g., ) or a blank value when generating a codebook for the second group. In other words, if a certain predetermined group is indicated by a group index field (e.g., when g is set by the UE, corresponding to g = 1), and the last DCI format in the set of DCI formats does not include a group index field, the UE may set

[0113] Figure 4 FIG. shows an example of a feedback scheme 400 that supports techniques for determining group identification and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. In some examples, the feedback scheme 400 may implement aspects of the wireless communication system 100 and the wireless communication system 200. For example, the feedback scheme 400 may illustrate communication between a UE 115 and a base station 105, where the UE 115 and the base station 105 may be examples of the UE 115 or the UE 215 and the base station 105 or the base station 205 described with reference to Figure 1 and Figure 2 . The feedback scheme 400 may enable a wireless device to implement rules for determining values to use when generating a HARQ codebook.

[0114] In some examples, the feedback scheme 400 may implement aspects of the feedback scheme 300. For example, the feedback scheme 400 may include a DCI message 405, a PDSCH transmission 410, a PUCCH transmission 420, and one or more parameters of the DCI message 405, which may be those described with reference to Figure 3An example of the corresponding communication and parameters described. As shown, the parameters may include a group index g with a value of 1, which indicates that the DCI message 405 corresponds to a PDSCH transmission 410 belonging to group 1. These parameters may also include an NFI value h = 1, an information request field value q = 1, an indication of the next PUCCH transmission opportunity K1 = 2, and a DAI value DAI = 2. Additionally, the DCI message 405 may include parameters corresponding to a second group (e.g., group 0), such as h' = 0 and DAI' = 1.

[0115] The UE may apply one or more rules (e.g., as described with reference to Figure 3 to determine the group associated with the PDSCH transmission 410. As an example, the UE may identify that the DCI message 405 uses DCI format 1_1 based on an index associated with one or more received DCI messages and is the last (e.g., index, sorting, reception time) DCI message that includes a group index value g. Thus, the UE may determine the value to use when generating the HARQ codebook for the associated group based on the value indicated in the DCI message 405. For example, the UE may identify the group index value from the group index field of the DCI message 405. Thus, the UE may set g = 1, h = 1, and q = 1. The UE may use the h' value of the second group as h (g+1)mod2 (g) = 0 and use the DAI' value of the second group as Here, although the group index value from the selected DCI message 405 indicates g = 1, the last DCI based on the index performed by the UE has a format that includes a PDSCH group index field, and the UE may utilize the DAI' value from the DCI message 405 (e.g., based on the format of the DCI message 405).

[0116] One or more HARQ-ACK codebooks may be generated based on the determined values of the associated groups, and the UE may send the codebooks within the feedback message sent on the PUCCH transmission 420 during the same time period.

[0117] Figure 5 FIG. shows an example of a feedback scheme 500 that supports techniques for determining group identification and DAI for an enhanced dynamic codebook according to various aspects of the present disclosure. In some examples, the feedback scheme 500 may implement aspects of the wireless communication system 100 and the wireless communication system 200. For example, the feedback scheme 500 may illustrate the communication between the UE 115 and the base station 105, where the UE 115 and the base station 105 may be respectively referred to as Figure 1 and Figure 2Examples of the described UE 115 or UE 215 and base station 105 or base station 205. Feedback scheme 500 may enable a wireless device to implement rules for determining values for generating a HARQ codebook included in a feedback message.

[0118] In some examples, feedback scheme 500 may implement aspects of feedback scheme 300. For example, feedback scheme 500 may include DCI message 505, PDSCH transmissions 510, 515, and 520, PUCCH transmission 520, and one or more parameters of DCI message 505, which may be examples of the corresponding communications and parameters as described with reference to Figure 3 As indicated by the group index value of the group index field in DCI message 505-a, PDSCH transmission 510 may be associated with group 1. Similarly, the group index value of the group index field in DCI message 505-b indicates that PDSCH transmission 515 may be associated with group 0. However, DCI message 505-c may be a fallback DCI message (or may be a DCI message 505 having a format that does not include a PDSCH group index field), and may not include a group index field and / or a group index value, and it may be assumed that PDSCH transmission 520 is associated with a predetermined group (e.g., group 0).

[0119] The UE may index DCI message 505 (e.g., as described with reference to Figure 3 ), and may determine that the last DCI (e.g., DCI message 505-c) is a DCI message that does not include a group index field (e.g., has a format that does not include a group index field) based on the associated index. Thus, the UE may select DCI message 505-b as the last DCI message that includes a group index field (e.g., has a format that includes a group index field). The UE may determine the group g associated with PDSCH transmission 515, for example, by identifying the associated group index value indicated by the group index field.

[0120] In addition, the UE may determine (e.g., set) the total DAI value for another group based on determining the value of g. As an example, since the UE identifies that g = 0, the UE may utilize the DAI' value from DCI message 505-b (e.g., the total DAI for group 1). Thus, the DAI value for group 1 set by the UE and used to generate the HARQ codebook may correspond to the DAI value included in DCI message 505-a, and thus provide accurately generated HARQ codebooks for each PDSCH group.

[0121] Thus, one or more HARQ codebooks may be generated based on the determined values for the associated groups, and the UE may send the codebooks in a feedback message on PUCCH transmission 525.

[0122] Figure 6 FIG. 600 illustrates an example of a feedback scheme that supports techniques for determining group identities and DAI for an enhanced dynamic codebook, in accordance with various aspects of the present disclosure. In some examples, feedback scheme 600 may implement aspects of wireless communication system 100 and wireless communication system 200. For example, feedback scheme 600 may illustrate communication between UE 115 and base station 105, where UE 115 and base station 105 may be examples of UE 115 or UE 215 and base station 105 or base station 205, respectively, as described with reference to Figure 1 and Figure 2 Feedback scheme 600 may enable a wireless device to implement rules for determining values for a HARQ codebook included in a feedback message.

[0123] In some examples, feedback scheme 600 may implement aspects of feedback scheme 300. For example, feedback scheme 600 may include DCI message 605, PDSCH transmissions 610, 615, and 620, PUCCH transmission 625, and one or more parameters of DCI message 605, which may be examples of corresponding communications and parameters as described with reference to Figure 3 As indicated by the group index field of DCI message 605-a, PDSCH transmission 610 may be associated with group index value 0. Similarly, the group index field of DCI message 605-b indicates that PDSCH transmission 615 may be associated with group index value 1. However, DCI message 605-c may be a fallback DCI message and may not include a group index field and / or group index value (e.g., may have a format that does not include a group index field), and PDSCH transmission 620 may not be associated with a group.

[0124] To determine the group for the HARQ-ACK codebook used by the UE for the three PDSCH transmissions 610, 615, and 620, the UE may index DCI message 605 (e.g., as described with reference to Figure 3 ), and may determine that the last DCI message (e.g., DCI message 605-c) does not include a group index field (e.g., has a format that does not include a group index field) based on the associated index. Thus, the UE may select DCI message 605-b as the last DCI message that includes a group index field (e.g., has a format that includes a group index field). The UE may determine the group for the HARQ-ACK codebook based on the group index value of the group index field of the selected DCI message (e.g., DCI message 605-b).

[0125] In this example, since the group index indication g = 1 of the selected DCI message 605-b, the UE can set the determined group index to g = 1. However, the DAI' value of the second group (group 0) indicated in the DCI message 605-b may not be available to the UE because the DAI' value may not consider the DCI message 605-c. That is, since the DCI message 605-c may not include a group index field, the UE can assume that the DCI message 605-c is included in group 0, but the DCI message 605-c occurs after the selected DCI message 605-b, and the DAI' may not consider the total DAI for this group. Therefore, the UE can apply a first value (e.g., a null value, a blank value, etc.) to the DAI' value when generating the corresponding codebook. More specifically, since the value of the group index field in the selected last DCI message 605-b indicates a certain predetermined group (e.g., such that the UE can set g = 1 and the group determined as described by the above rules), and the last DCI message 605-c has a format that does not include a PDSCH group index field (such as a fallback DCI format or another DCI format), the UE can set to generate feedback for the second group (group 0).

[0126] Therefore, one or more HARQ codebooks can be generated based on the determined values for each group, and the UE can send the codebook in a feedback message on the PUCCH transmission 625.

[0127] Figure 7 FIG. 700 is a block diagram of a device 705 that supports techniques for determining group identities and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. The device 705 may be an example of aspects of the UE 115 described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0128] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to supporting techniques for determining group identities and DAI for an enhanced dynamic codebook, etc.). The information may be passed to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 1020 described Figure 10 herein. The receiver 710 may utilize a single antenna or a set of antennas.

[0129] The communication manager 715 may receive one or more DCI messages scheduling one or more downlink transmission groups, where feedback messages for the one or more downlink transmissions will be sent during the same time period. The communication manager 715 may identify a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message. In some examples, the communication manager 715 may index the received one or more DCI messages based on a set of serving cell indices and a set of monitoring occasion indices (e.g., a PDCCH monitoring occasion index set) of the same PDCCH monitoring index. The communication manager 715 may identify a group index value indicating a first group from the one or more downlink transmission groups from the group index field of the first DCI message; and send a feedback message for the one or more downlink transmission groups during the same time period, the feedback message being at least partially based on the identified group index value. The communication manager 715 may be an example of aspects of the communication manager 1010 described herein.

[0130] The communication manager 715 or its subcomponents may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 715 or its subcomponents may be performed by a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

[0131] The communication manager 715 or its subcomponents may physically be located at various positions, including being distributed such that portions of the functions are implemented by one or more physical components at different physical locations. In some examples, in accordance with aspects of this disclosure, the communication manager 715 or its subcomponents may be separate and distinct components. In some examples, in accordance with aspects of this disclosure, the communication manager 715 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0132] Actions performed by communication manager 715 as described herein can be implemented to achieve one or more potential advantages. One implementation can allow the UE to save power and increase battery life by avoiding having to perform complex procedures for determining groups when providing HARQ feedback. Additionally or alternatively, the UE can more accurately and efficiently determine the groups and associated parameters for providing feedback for multiple PDSCH groups.

[0133] Transmitter 720 can send signals generated by other components of device 705. In some examples, transmitter 720 can be co-located with receiver 710 in a transceiver component. For example, transmitter 720 can be an example of aspects of transceiver 1020 described with reference to Figure 10 Transmitter 720 can utilize a single antenna or a set of antennas.

[0134] Figure 8 FIG. 800 is a block diagram of a device 805 supporting techniques for determining group identification and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. Device 805 can be an example of aspects of device 705 or UE 115 as described herein. Device 805 can include a receiver 810, a communication manager 815, and a transmitter 835. Device 805 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0135] Receiver 810 can 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 supporting techniques for determining group identification and DAI for an enhanced dynamic codebook, etc.). The information can be passed to other components of device 805. Receiver 810 can be an example of aspects of transceiver 1020 described with reference to Figure 10 Receiver 810 can utilize a single antenna or a set of antennas.

[0136] Communication manager 815 can be an example of aspects of communication manager 715 as described herein. Communication manager 815 can include a DCI manager 820, an index component 825, and a feedback manager 830. Communication manager 815 can be an example of aspects of communication manager 1010 described herein.

[0137] The DCI manager 820 may receive one or more DCI messages scheduling one or more downlink transmission groups, where feedback messages for the one or more downlink transmissions will be sent during the same time period. The DCI manager 820 may identify a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, and the first DCI message includes a group index field according to the format of the first DCI message.

[0138] The index component 825 may index the received one or more DCI messages based on a serving cell index set and a monitoring occasion index set.

[0139] The feedback manager 830 may identify a group index value indicating a first group from the one or more downlink transmission groups based on the group index field of the first DCI message; and send feedback messages for the one or more downlink transmission groups during the same time period, where the feedback messages are based on the identified group index value.

[0140] The transmitter 835 may send signals generated by other components of the device 805. In some examples, the transmitter 835 may be co-located with the receiver 810 in a transceiver component. For example, the transmitter 835 may be an example of aspects of the transceiver 1020 described with reference to Figure 10 The transmitter 835 may utilize a single antenna or a set of antennas.

[0141] Based on the use of various rules for using enhanced dynamic codebooks to provide HARQ feedback, a processor of the UE (e.g., controlling the receiver 810, the transmitter 835, or the transceiver 1020 as described with reference to Figure 10 can efficiently determine the group index and other associated parameters when generating and sending feedback messages. Thus, when generating the HARQ codebook, the processor can more efficiently determine the bit values to include in the HARQ feedback report (as opposed to cases where the HARQ process may be complex or include a degree of ambiguity based on assumptions). These processes can accordingly improve HARQ processing, thus enabling efficient communication in a wireless system. More specifically, the improved HARQ process can provide higher reliability, which can further lead to increased data rates, increased capacity, improved spectral efficiency, etc.

[0142] Figure 9FIG. 900 is a block diagram of a communication manager 905 that supports techniques for determining group identification and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, communication manager 815, or communication manager 1010 described herein. The communication manager 905 may include a DCI manager 910, an index component 915, a feedback manager 920, a DAI manager 925, a group manager 930, and an NFI manager 935. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0143] The DCI manager 910 may receive one or more DCI messages scheduling one or more downlink transmission groups, where feedback messages for the one or more downlink transmissions will be sent during the same time period.

[0144] In some examples, the DCI manager 910 may identify a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message.

[0145] In some examples, the DCI manager 910 may receive a second DCI message that does not include a group index field according to the format of the second DCI message, the second DCI message including a last DCI message.

[0146] In some examples, the DCI manager 910 may receive a second DCI message that does not include a group index field according to the format of the second DCI message, where the second DCI message is a last DCI message.

[0147] In some examples, the DCI manager 910 may receive a second DCI message that does not include a group index field according to the format of the second DCI message, where the first DCI message is selected based on the second DCI message not including a group index field.

[0148] In some examples, the DCI manager 910 may receive a third DCI message that includes a group index field according to the format of the third DCI message, where the first DCI message is selected based on the first DCI message being after the third DCI message.

[0149] In some cases, the format of the second DCI message includes a fallback DCI format. In some cases, the format of the second DCI message includes a non-fallback DCI format that does not include a group index field. In some cases, each DCI message in one or more DCI messages has a DCI format from a set of DCI formats. In some cases, the format of the first DCI message includes a non-fallback DCI format.

[0150] Index component 915 may index one or more received DCI messages based on a serving cell index set and a monitoring occasion index set. In some examples, index component 915 may index one or more received DCI messages in a first ascending order across the serving cell index set for the same monitoring occasion. In some cases, index component 915 may index one or more received DCI messages in a second ascending order across the monitoring occasion index set based on the first ascending order.

[0151] In some examples, index component 915 may determine, based on the index, that the first DCI message is the last DCI message that includes a group index field.

[0152] Feedback manager 920 may identify a group index value indicating a first group from one or more downlink transmission groups based on the group index field of the first DCI message. In some examples, feedback manager 920 may send, during the same time period, a feedback message for one or more downlink transmission groups that is based on the identified group index value.

[0153] In some examples, feedback manager 920 may generate a second codebook for a second group using the value of the counter DAI of the second DCI message by setting the total DAI value to a blank value or a null value, where the feedback message includes the second codebook.

[0154] In some examples, feedback manager 920 may generate a first codebook for a first group and a second codebook for a second group different from the first group based on one or more fields of the first DCI message, where the feedback message includes the first codebook, the second codebook, or a combination thereof.

[0155] DAI manager 925 may identify a total DAI value for a second group different from the first group based on the group index value identified from the first DCI message, where the feedback message is based on the identified total DAI value for the second group.

[0156] In some examples, the DAI manager 925 may identify the total DAI value from the first DCI message based on this determination. In some examples, the DAI manager 925 may identify the total DAI value from the first DCI message based on a second DCI message that does not include a group index field. In some examples, the DAI manager 925 may identify the total DAI value from the first DCI message based on the format of the first DCI message.

[0157] In some examples, the DAI manager 925 may set the total DAI value for a second group to a first value based on this determination. In some cases, the first value includes a blank value or a null value. The group manager 930 may determine that the first group includes a first predetermined group based on the identified group index. In some examples, it is determined that the first group includes a second predetermined group based on the identified group index.

[0158] The NFI manager 935 may identify from the first DCI message: the value of the first NFI field for the first group, the number of requested groups, the value of the second NFI field for a second group different from the first group, or a combination thereof.

[0159] Figure 10 FIG. 1000 shows a system 1000 including a device 1005 that supports techniques for determining group identification and DAI for an enhanced dynamic codebook, in accordance with various aspects of the present disclosure. The device 1005 may be an example of the device 705, the device 805, or the UE 115 described herein or include components of the device 705, the device 805, or the UE 115. The device 1005 may include components for two-way voice and data communication, including components for sending and receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may communicate electronically via one or more buses (e.g., bus 1045).

[0160] The communication manager 1010 may perform the following operations: receive one or more DCI messages scheduling one or more downlink transmission groups, where feedback messages for the one or more downlink transmissions will be sent during the same time period; identify a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message; identify a group index value indicating a first group from the one or more downlink transmission groups based on the group index field of the first DCI message; and send a feedback message for the one or more downlink transmission groups during the same time period, the feedback message being based on the identified group index.

[0161] The I / O controller 1015 can manage the input and output signals for the device 1005. The I / O controller 1015 can also manage peripheral devices not integrated into the device 1005. In some cases, the I / O controller 1015 can represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 1015 can utilize an operating system such as or another known operating system. In other cases, the I / O controller 1015 can represent a modem, keyboard, mouse, touch screen, or similar device or interact with the above devices. In some cases, the I / O controller 1015 can be implemented as part of a processor. In some cases, a user can interact with the device 1005 via the I / O controller 1015 or via the hardware components controlled by the I / O controller 1015.

[0162] The transceiver 1020 can communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1020 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna.

[0163] In some cases, the wireless device can include a single antenna 1025. However, in some cases, the device can have more than one antenna 1025, which can simultaneously send or receive multiple wireless transmissions.

[0164] The memory 1030 can include random access memory (RAM) and read-only memory (ROM). The memory 1030 can store computer-readable, computer-executable code 1035 that includes instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, in addition, the memory 1030 can also contain a basic input / output system (BIOS) that can control basic hardware or software operations, such as interactions with peripheral components or devices.

[0165] The processor 1040 may include intelligent hardware devices (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 1040 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 1040. The processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting techniques for determining a group identity and DAI for an enhanced dynamic codebook).

[0166] The code 1035 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communication. The code 1035 may be stored in a non-transitory computer-readable medium (e.g., system memory or other types of memory). In some cases, the code 1035 may not be directly executable by the processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0167] Figure 11 A flowchart illustrating a method 1100 supporting techniques for determining a group identity and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure is shown. Operations of the method 1100 may be implemented by a UE 115 or its components as described herein. For example, operations of the method 1100 may be performed by a communication manager as described with reference to Figures 7 to 10 described. In some examples, the UE may execute an instruction set to control functional units of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0168] At 1105, the UE may receive one or more DCI messages scheduling one or more downlink transmission groups, where feedback messages for the one or more downlink transmissions will be sent during the same time period. The operation of 1105 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1105 may be performed by a DCI manager as described with reference to Figures 7 to 10 described.

[0169] At 1110, the UE may identify a first DCI message from the one or more DCI messages based on an index associated with the one or more DCI messages, the first DCI message including a group index field according to the format of the first DCI message. The operation of 1110 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1110 may be performed by a DCI manager as described with reference to Figures 7 to 10Execute by the described DCI manager.

[0170] At 1115, the UE can identify a group index value indicating a first group from one or more downlink transmission groups based on the group index field of the first DCI message. The operation at 1115 can be performed according to the methods described herein. In some examples, aspects of the operation at 1115 can be performed by a feedback manager as described with reference to Figures 7 to 10 the described feedback manager.

[0171] At 1120, the UE can send a feedback message for one or more downlink transmission groups during the same time period, and the feedback message is based on the identified group index value. The operation at 1120 can be performed according to the methods described herein. In some examples, aspects of the operation at 1120 can be performed by a feedback manager as described with reference to Figures 7 to 10 the described feedback manager.

[0172] Figure 12 A flowchart of a method 1200 is shown that illustrates techniques for determining group identification and DAI for an enhanced dynamic codebook in accordance with various aspects of the present disclosure. The operations of method 1200 can be implemented by a UE 115 or its components as described herein. For example, the operations of method 1200 can be performed by a communication manager as described with reference to Figures 7 to 10 the described communication manager. In some examples, the UE can execute an instruction set to control the functional units of the UE to perform the functions described herein. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described herein.

[0173] At 1205, the UE can receive one or more DCI messages scheduling one or more downlink transmission groups, where a feedback message for one or more downlink transmissions will be sent during the same time period. The operation at 1205 can be performed according to the methods described herein. In some examples, aspects of the operation at 1205 can be performed by a DCI manager as described with reference to Figures 7 to 10 the described DCI manager.

[0174] At 1210, the UE can identify a first DCI message from one or more DCI messages based on an index associated with the one or more DCI messages, and the first DCI message includes a group index field according to the format of the first DCI message. The operation at 1210 can be performed according to the methods described herein. In some examples, aspects of the operation at 1210 can be performed by a DCI manager as described with reference to Figures 7 to 10 the described DCI manager.

[0175] At 1215, the UE can identify a group index value indicating a first group from one or more downlink transmission groups based on the group index field of the first DCI message. The operation of 1215 can be performed according to the methods described herein. In some examples, aspects of the operation of 1215 can be performed by a feedback manager as described with reference to Figures 7 to 10 described.

[0176] At 1220, the UE can identify a total DAI value for a second group different from the first group based on the group index value identified from the first DCI message, wherein the feedback message is based on the identified total DAI value for the second group. The operation of 1220 can be performed according to the methods described herein. In some examples, aspects of the operation of 1220 can be performed by a DAI manager as described with reference to Figures 7 to 10 described.

[0177] At 1225, the UE can send, during the same time period, a feedback message for one or more downlink transmission groups, the feedback message being based on the identified group index value and the identified total downlink assignment index value for the second group. The operation of 1225 can be performed according to the methods described herein. In some examples, aspects of the operation of 1225 can be performed by a feedback manager as described with reference to Figures 7 to 10 described.

[0178] It should be noted that the methods described herein describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are possible. In addition, aspects from two or more methods can be combined.

[0179] The following provides a summary of aspects of the present disclosure:

[0180] Aspect 1: A method for wireless communication, comprising: receiving one or more downlink control information messages scheduling one or more downlink transmission groups, wherein a feedback message for the one or more downlink transmissions will be sent during the same time period; at least partially based on an index associated with the one or more downlink control information messages, identifying a first downlink control information message from the one or more downlink control information messages, the first downlink control information message including a group index field according to the format of the first downlink control information message; identifying, from the group index field of the first downlink control information message, a group index value indicating a first group from the one or more downlink transmission groups; and sending, during the same time period, the feedback message for the one or more downlink transmission groups, the feedback message being at least partially based on the identified group index value.

[0181] Aspect 2: The method according to aspect 1 further includes: identifying a total downlink assignment index value for a second group different from the first group at least partially based on a group index value identified from the first downlink control information message, wherein the feedback message is at least partially based on the identified total downlink assignment index value for the second group.

[0182] Aspect 3: The method according to aspect 2, wherein identifying the total downlink assignment index value for the second group includes: determining that the first group includes a first predetermined group at least partially based on the identified group index value; receiving a second downlink control information message that does not include the group index field according to the format of the second downlink control information message, wherein the second downlink control information message is after the first downlink control information message; and setting the total downlink assignment index value for the second group to a first value at least partially based on the determination.

[0183] Aspect 4: The method according to aspect 3, wherein the first value includes a blank value or a null value.

[0184] Aspect 5: The method according to aspect 4 further includes: generating a second codebook for the second group using a value of a counter downlink assignment index of the second downlink control information message at least partially based on setting the total downlink assignment index value to the blank value or the null value, wherein the feedback message includes the second codebook.

[0185] Aspect 6: The method according to aspect 2, wherein identifying the total downlink assignment index value for the second group includes: determining that the first group includes a second predetermined group at least partially based on the identified group index value; and identifying the total downlink assignment index value from the first downlink control information message at least partially based on the determination.

[0186] Aspect 7: The method according to aspect 2, wherein identifying the total downlink assignment index value for the second group includes: receiving a second downlink control information message that does not include the group index field according to the format of the second downlink control information message, wherein the second downlink control information is after the first downlink control information message; and identifying the total downlink assignment index value from the first downlink control information message at least partially based on the second downlink control information message not including the group index field.

[0187] Aspect 8: The method according to aspect 2, wherein identifying the total downlink assignment index value for the second group includes: identifying the total downlink assignment index value from the first downlink control information message at least in part based on the format of the first downlink control information message.

[0188] Aspect 9: The method according to any one of aspects 1 to 8, further comprising: indexing one or more received downlink control information messages in a first ascending order across a set of serving cell indices for the same monitoring occasion; and indexing one or more received downlink control information messages in a second ascending order across a set of monitoring occasion indices at least in part based on the first ascending order.

[0189] Aspect 10: The method according to any one of aspects 1 to 9, wherein receiving the one or more downlink control information messages includes: receiving a second downlink control information message that does not include the group index field according to the format of the second downlink control information message, wherein the first downlink control information message is selected at least in part based on the second downlink control information message not including the group index field.

[0190] Aspect 11: The method according to aspect 10, wherein the format of the second downlink control information message includes a fallback downlink control information format.

[0191] Aspect 12: The method according to any one of aspects 10 to 11, wherein the format of the second downlink control information message includes a non-fallback downlink control information format that does not include the group index field.

[0192] Aspect 13: The method according to any one of aspects 1 to 12, wherein receiving the one or more downlink control information messages includes: receiving a third downlink control information message that includes the group index field according to the format of the third downlink control information message, wherein the first downlink control information message is selected at least in part based on the first downlink control information message being after the third downlink control information message.

[0193] Aspect 14: The method according to any one of aspects 1 to 13, further comprising: determining at least in part based on the index that the first downlink control information message is the last downlink control information message including the group index field.

[0194] Aspect 15: The method according to any one of Aspects 1 to 14 further comprises: identifying from the first downlink control information message: a value of a first new feedback indication field for the first group, a number of requested groups, a value of a second new feedback indication field for a second group different from the first group, or a combination thereof.

[0195] Aspect 16: The method according to any one of Aspects 1 to 15 further comprises: generating at least in part based on one or more fields of the first downlink control information message a first codebook for the first group and a second codebook for a second group different from the first group, wherein the feedback message comprises the first codebook, the second codebook, or a combination thereof.

[0196] Aspect 17: The method according to any one of Aspects 1 to 16, wherein each downlink control information message of the one or more downlink control information messages has a downlink control information format from a set of downlink control information formats.

[0197] Aspect 18: The method according to any one of Aspects 1 to 17, wherein the format of the first downlink control information message comprises a non-backoff downlink control information format.

[0198] Aspect 19: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to any one of Aspects 1 to 18.

[0199] Aspect 20: An apparatus for wireless communication, comprising at least one unit for performing the method according to any one of Aspects 1 to 18.

[0200] Aspect 21: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to any one of Aspects 1 to 18.

[0201] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond the scope of LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to a variety of other wireless communication systems such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0202] The information and signals described herein may be represented using any of a variety of different technologies and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0203] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processor may be a microprocessor, but in the alternative, the processor may be any 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0204] 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 via a computer-readable medium as one or more instructions or code. Other examples and implementations are 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 of these items. The features implementing the functions may also be physically located at various positions, including being distributed such that portions of the functions are implemented at different physical locations.

[0205] A computer-readable medium includes both a non-transitory computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another. The non-transitory storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer. By way of example and not limitation, the non-transitory computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store the desired program code units in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Additionally, any connection is properly termed a computer-readable medium. For example, if software is transmitted using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable medium.

[0206] As used herein (including in the claims), the "or" as used in a list of items (e.g., a list of items that ends with a phrase such as "at least one of... " or "one or more of... ") indicates an inclusive list, such that a list of at least one of A, B, or C, for example, means A or B or C or AB or AC or BC or ABC (e.g., A and B and C). Additionally, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0207] In the figures, similar components or features may have the same reference numerals. Additionally, various components of the same type can be distinguished by following the reference numeral with a dash and a second numeral, which is used to differentiate between similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, regardless of the second reference numeral or any other subsequent reference numerals.

[0208] The description set forth herein with reference to the drawings describes example configurations and does not represent all examples that may be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and not "preferred" or "advantageous over other examples." For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, the technology may be practiced without these specific details. In some instances, structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0209] The description herein is provided to enable a person 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 general 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 is accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: Receiving a first downlink control information message and a second downlink control information message in a set of downlink control information messages for scheduling one or more downlink transmission groups, the first downlink control information message including a group index field according to the format of the first downlink control information message, and the second downlink control information message not including the group index field according to the format of the second downlink control information message, wherein feedback messages for the one or more downlink transmission groups will be sent during the same time period; Identifying that the first downlink control information message is the last downlink control information message in the set of downlink control information messages, at least in part based on an index associated with each downlink control information message in the set of downlink control information messages; Identifying a group index value indicating a first group from the one or more downlink transmission groups from the group index field of the first downlink control information message; and Sending the feedback messages for the one or more downlink transmission groups during the same time period, the feedback messages being at least in part based on the identified group index value.

2. The method according to claim 1, further comprising: Identifying a total downlink assignment index value for a second group different from the first group, at least in part based on the group index value identified from the first downlink control information message, wherein the feedback messages are at least in part based on the identified total downlink assignment index value for the second group.

3. The method according to claim 2, wherein, The second downlink control information message is after the first downlink control information message, and wherein identifying the total downlink assignment index value for the second group includes: Determining that the first group includes a first predetermined group, at least in part based on the identified group index value; and Setting the total downlink assignment index value for the second group to a first value, at least in part based on the determination.

4. The method according to claim 3, wherein, The first value includes a blank value or a null value.

5. The method according to claim 4, further comprising: Generating a second codebook for the second group using the value of the counter downlink assignment index of the second downlink control information message, at least in part based on setting the total downlink assignment index value to the blank value or the null value, wherein the feedback messages include the second codebook.

6. The method according to claim 2, wherein, Identifying the total downlink assignment index value for the second group includes: Determining that the first group includes a second predetermined group, at least in part based on the identified group index value; and Identifying the total downlink assignment index value from the first downlink control information message, at least in part based on the determination.

7. The method according to claim 2, wherein, The second downlink control information message is after the first downlink control information message, and wherein identifying the total downlink assignment index value for the second group includes: Identifying the total downlink assignment index value from the first downlink control information message, at least in part based on the second downlink control information message not including the group index field.

8. The method according to claim 2, wherein, Identifying the total downlink assignment index value for the second group includes: Identify the total downlink assignment index value from the first downlink control information message, at least in part, based on the format of the first downlink control information message.

9. The method according to claim 1, further comprising: Index each downlink control information message in the set of downlink control information messages in a first ascending order across a set of serving cell indices for the same monitoring occasion; And Index each downlink control information message in the set of downlink control information messages in a second ascending order across a set of monitoring occasion indices, at least in part, based on the first ascending order.

10. The method according to claim 1, wherein, The first downlink control information message is identified, at least in part, based on the second downlink control information message not including the group index field.

11. The method according to claim 10, wherein, The format of the second downlink control information message includes a fallback downlink control information format.

12. The method according to claim 10, wherein, The format of the second downlink control information message includes a non-fallback downlink control information format that does not include the group index field.

13. The method according to claim 1, wherein, Receiving the set of downlink control information messages includes: Receiving a third downlink control information message that includes the group index field according to the format of the third downlink control information message, wherein the first downlink control information message is identified as the last downlink control information message in the set of downlink control information messages, at least in part, based on the first downlink control information message being after the third downlink control information message.

14. The method according to claim 1, further comprising: Identify from the first downlink control information message: the value of a first new feedback indication field for the first group, the number of requested groups, the value of a second new feedback indication field for a second group different from the first group, or a combination thereof.

15. The method according to claim 1 further comprises: Generate a first codebook for the first group and a second codebook for a second group different from the first group, at least in part, based on one or more fields of the first downlink control information message, wherein the feedback message includes the first codebook, the second codebook, or a combination thereof.

16. The method according to claim 1, wherein Each downlink control information message in the set of downlink control information messages has a downlink control information format from a set of downlink control information formats.

17. The method according to claim 1, wherein The format of the first downlink control information message includes a non-fallback downlink control information format.

18. An apparatus for wireless communication, comprising: A processor; A memory coupled to the processor; And Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: Receiving a first downlink control information message and a second downlink control information message in a set of downlink control information messages scheduling one or more downlink transmission groups, the first downlink control information message including a group index field according to the format of the first downlink control information message, and the second downlink control information message not including the group index field according to the format of the second downlink control information message, wherein feedback messages for the one or more downlink transmission groups will be sent during the same time period; Identifying that the first downlink control information message is the last downlink control information message in the set of downlink control information messages, at least in part based on an index associated with each downlink control information message in the set of downlink control information messages; Identifying a group index value indicating a first group from the one or more downlink transmission groups from the group index field of the first downlink control information message; and Sending the feedback messages for the one or more downlink transmission groups during the same time period, the feedback messages being at least in part based on the identified group index value.

19. The apparatus according to claim 18, wherein The instructions may also be executed by the processor to cause the device to perform the following operations: Identifying a total downlink assignment index value for a second group different from the first group, at least in part based on the group index value identified from the first downlink control information message, wherein the feedback message is at least in part based on the identified total downlink assignment index value for the second group.

20. The apparatus according to claim 19, wherein The second downlink control information message is after the first downlink control information message, and wherein the instructions for identifying the total downlink assignment index value for the second group may be executed by the processor to cause the device to perform the following operations: Determining that the first group includes a first predetermined group, at least in part based on the identified group index value; and Setting the total downlink assignment index value for the second group to a first value, at least in part based on the determination.

21. The apparatus according to claim 20, wherein The first value includes a blank value or a null value.

22. The apparatus according to claim 21, wherein The instructions may also be executed by the processor to cause the device to perform the following operations: Generating a second codebook for the second group using the value of the counter downlink assignment index of the second downlink control information message, at least in part based on setting the total downlink assignment index value to the blank value or the null value, wherein the feedback message includes the second codebook.

23. The apparatus according to claim 19, wherein The instructions for identifying the total downlink assignment index value for the second group may be executed by the processor to cause the device to perform the following operations: Determining that the first group includes a second predetermined group, at least in part based on the identified group index value; and Identifying the total downlink assignment index value from the first downlink control information message, at least in part based on the determination.

24. The apparatus according to claim 19, wherein The second downlink control information message is after the first downlink control information message, and wherein instructions for identifying the total downlink assignment index value for the second group are executable by the processor to cause the device to: Identify the total downlink assignment index value from the first downlink control information message at least in part based on the second downlink control information message not including the group index field.

25. The apparatus according to claim 19, wherein Instructions for identifying the total downlink assignment index value for the second group are executable by the processor to cause the device to: Identify the total downlink assignment index value from the first downlink control information message at least in part based on the format of the first downlink control information message.

26. The apparatus according to claim 18, wherein The instructions are further executable by the processor to cause the device to: Index each downlink control information message in the set of downlink control information messages in a first ascending order across a set of serving cell indices for the same monitoring occasion; And Index each downlink control information message in the set of downlink control information messages in a second ascending order across a set of monitoring occasion indices at least in part based on the first ascending order.

27. The apparatus according to claim 18, wherein, The first downlink control information message is identified at least in part based on the second downlink control information message not including the group index field.

28. The apparatus according to claim 27, wherein, The format of the second downlink control information message includes a fallback downlink control information format.

29. The apparatus according to claim 27, wherein, The format of the second downlink control information message includes a non-fallback downlink control information format that does not include the group index field.

30. The apparatus according to claim 18, wherein, Instructions for receiving the set of downlink control information messages are executable by the processor to cause the device to: Receive a third downlink control information message that includes the group index field according to the format of the third downlink control information message, wherein the first downlink control information message is identified as the last downlink control information message in the set of downlink control information messages at least in part based on the first downlink control information message being after the third downlink control information message.

31. The apparatus according to claim 18, wherein, The instructions are further executable by the processor to cause the device to: Identify from the first downlink control information message: the value of a first new feedback indication field for the first group, the number of requested groups, the value of a second new feedback indication field for a second group different from the first group, or a combination thereof.

32. The apparatus according to claim 18, wherein, The instructions are further executable by the processor to cause the device to: Generate a first codebook for the first group and a second codebook for a second group different from the first group at least in part based on one or more fields of the first downlink control information message, wherein the feedback message includes the first codebook, the second codebook, or a combination thereof.

33. The apparatus according to claim 18, wherein, Each downlink control information message in the set of downlink control information messages has a downlink control information format from a set of downlink control information formats.

34. The apparatus according to claim 18, wherein, The format of the first downlink control information message includes a non-backoff downlink control information format.

35. An apparatus for wireless communication, comprising: A unit for receiving a first downlink control information message and a second downlink control information message in a set of downlink control information messages for scheduling one or more downlink transmission groups, the first downlink control information message including a group index field according to the format of the first downlink control information message, and the second downlink control information message not including the group index field according to the format of the second downlink control information message, wherein feedback messages for the one or more downlink transmission groups will be sent during the same time period; A unit for identifying that the first downlink control information message is the last downlink control information message in the set of downlink control information messages, at least in part based on an index associated with each downlink control information message in the set of downlink control information messages; A unit for identifying, from the group index field of the first downlink control information message, a group index value indicating a first group from the one or more downlink transmission groups; and A unit for sending, during the same time period, the feedback messages for the one or more downlink transmission groups, the feedback messages being at least in part based on the identified group index value.

36. A non - transitory computer - readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: Receive a first downlink control information message and a second downlink control information message in a set of downlink control information messages scheduling one or more downlink transmission groups, the first downlink control information message including a group index field according to the format of the first downlink control information message, and the second downlink control information message not including the group index field according to the format of the second downlink control information message, wherein, Feedback messages for the one or more downlink transmission groups will be sent during the same time period; Identifying that the first downlink control information message is the last downlink control information message in the set of downlink control information messages, at least in part based on an index associated with each downlink control information message in the set of downlink control information messages; Identifying, from the group index field of the first downlink control information message, a group index value indicating a first group from the one or more downlink transmission groups; And Sending, during the same time period, the feedback messages for the one or more downlink transmission groups, the feedback messages being at least in part based on the identified group index value.

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