Transmission of Downlink Feedback Information Using Downlink Control Information Format 0_2

Abstract

The present disclosure relates to an apparatus, a method, and a computer-readable medium for transmitting downlink feedback information using downlink control information format 0_2. A user equipment (UE) may receive downlink control information (DCI) having a first predetermined DCI format or a second predetermined DCI format from a base station on a first subband, where the second predetermined DCI format has a length less than that of the first predetermined DCI format. When receiving the DCI having the second predetermined DCI format, the UE may also determine that the DCI indicates downlink feedback information (DFI) based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI.

Description

Background Technical Field

[0002] The present disclosure generally relates to communication systems, and more particularly to the transmission of downlink feedback information using downlink control information format 0_2.

[0003] Introduction

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ a multiple access technology that is capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at the city, national, regional, and even global levels. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., related to the Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Some aspects of 5G NR can be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvement in 5G NR technology. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies.

[0006] Overview

[0007] A brief overview of one or more aspects is presented below to provide a basic understanding of such aspects. This overview is not an exhaustive survey of all contemplated aspects, and is neither intended to identify key or critical elements of all aspects nor to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0008] In some aspects, the present technology enables enhanced physical layer feedback to meet the URLLC specifications covering the following: (1) User Equipment (UE) feedback enhancement for Hybrid Automatic Repeat reQuest acknowledgement (HARQ-ACK) techniques, and (2) Channel State Information (CSI) feedback enhancement to allow for more precise Modulation and Coding Scheme (MCS) selection. In some aspects, the CSI feedback enhancement may include CSI feedback enhancement based on Demodulation Reference Signals (DMRS).

[0009] In some aspects, the present technology also enables uplink enhancement for URLLC in an unlicensed controlled environment by coordinating NR Unlicensed (NR-U) and uplink (UL) configured-grant enhancements in URLLC for unlicensed spectrum. The present technology can specify support for UE-initiated Channel Occupancy Time (COT) for Frame-Based Equipment (FBE) with minimal specification effort.

[0010] In some aspects, the present technology also enables in-UE multiplexing and prioritization of traffic with different priorities by (1) specifying the multiplexing behavior between HARQ-ACK / SR / CSI and PUSCH for traffic with different priorities, including the case with uplink channel information (UCI) on the Physical Uplink Control Channel (PUCCH) and UCI on the Physical Uplink Shared Channel (PUSCH), or (2) specifying physical layer (PHY) prioritization of overlapping dynamic grants for PUSCH and configured grants (CG) PUSCH with different PHY priorities on the bandwidth part (BWP) of the serving cell, including the associated cancellation behavior for PUSCH with lower PHY priorities.

[0011] In some aspects, the present technology also enables enhanced support for time synchronization. For example, the present technology may include mechanisms for monitoring (1) the impact (if any) of the Service and System Aspects Working Group 2 (SA 2) working on the radio access network (RAN) uplink time synchronization for Time-Sensitive Networking (TSN), (2) enhanced propagation delay compensation, including mobility issues (if any), or (3) RAN enhancements based on new Quality of Service (QoS)-related parameters (if any, e.g., time-to-live, burst propagation, determined in SA 2).

[0012] In a 5G NR system operating in unlicensed spectrum (e.g., NR-U), downlink feedback information (DFI) is introduced to address symptoms caused by listen-before-talk (LBT) failures, and the DFI is transmitted using a downlink control information (DCI) format 0_1 frame structure that has a cyclic redundancy check (CRC) scrambled by a scrambling code such as a configured scheduling radio network temporary identifier (CS-RNTI). In a URLLC system, a compact DCI format 0_2 frame structure is introduced to provide improved physical downlink control channel (PDCCH) reliability.

[0013] For URLLC to operate in NR-U, a DFI-based approach can be reused to counter LBT failures. However, the DFI can only be transmitted using DCI format 0_1 with a CRC scrambled by CS-RNTI, which has the following challenges: (1) the UE blind detection complexity increases because the UE has to monitor both DCI formats 0_1 and 0_2 to use the DFI-based approach, and (2) if the UE only supports monitoring DCI format 0_2, the DFI-based approach may not be used. This may result in a reduction in the reliability of the CG DFI compared to the compact DCI format 0_2 frame structure.

[0014] The present disclosure provides for transmitting downlink feedback information with a DCI format 0_2 frame structure to address LBT failures observed in NR-U operation while providing improved PDCCH reliability in URLLC operation. This can facilitate coordinating UL CG enhancements in NR-U and URLLC for unlicensed spectrum.

[0015] In one aspect of the present disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus is configured to receive, from a base station, a DCI having a first predetermined DCI format or a second predetermined DCI format on a first subband, the second predetermined DCI format having a length less than the first predetermined DCI format. The apparatus is further configured to determine that the DCI indicates DFI based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI when the DCI having the second predetermined DCI format is received.

[0016] In one aspect of the present disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus is configured to generate a DCI having a first predetermined DCI format or a second predetermined DCI format, the second predetermined DCI format having a length less than the first predetermined DCI format. The apparatus is further configured to communicate, on a first subband, with a UE the DCI indicating DFI based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI when the DCI having the second predetermined DCI format is communicated.

[0017] To achieve the foregoing and related purposes, one or more aspects include the features that are fully described hereinafter and particularly pointed out in the claims. The following description and the drawings set forth certain illustrative features of one or more aspects in detail. However, these features are merely indicative of some of the various ways in which the principles of the various aspects may be employed, and this description is intended to cover all such aspects and their equivalents. Brief Description of the Drawings

[0019] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0020] Figure 2A 、 2B 、2C, and 2D are diagrams respectively illustrating examples of a first 5G / NR frame, a DL channel within a 5G / NR subframe, a second 5G / NR frame, and a UL channel within a 5G / NR subframe.

[0021] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0022] Figure 4 is a diagram illustrating an example of a physical downlink control channel for indicating downlink feedback information having a predetermined format encoded with a first scrambling code according to some aspects of the present disclosure.

[0023] Figure 5 is a diagram illustrating an example of a physical downlink control channel for indicating downlink feedback information having a predetermined format encoded with a second scrambling code according to some aspects of the present disclosure.

[0024] Figure 6 is a diagram illustrating an example of a physical downlink control channel for indicating downlink feedback information having a predetermined format encoded with a third scrambling code according to some aspects of the present disclosure.

[0025] Figure 7 is a diagram illustrating an example of a physical downlink control channel for indicating downlink feedback information having a predetermined format encoded with a fourth scrambling code according to some aspects of the present disclosure.

[0026] Figure 8 is a diagram illustrating an example of a downlink feedback information frame structure compared with a downlink control information format 0_2 frame structure according to some aspects of the present disclosure.

[0027] Figure 9 is a diagram illustrating an example of a modification to a downlink feedback information frame structure corresponding to a downlink control information format 0_2 frame structure according to some aspects of the present disclosure.

[0028] Figure 10 is a diagram illustrating another example of a modification to a downlink feedback information frame structure corresponding to a downlink control information format 0_2 frame structure according to some aspects of the present disclosure.

[0029] Figure 11 is a flowchart illustrating a wireless communication process supporting reception of downlink feedback information using a downlink control information format 0_2 frame structure according to some aspects of the present disclosure.

[0030] Figure 12 is a conceptual data flow diagram illustrating the data flow between different components in an example device according to some aspects of the present disclosure.

[0031] Figure 13 is a diagram illustrating an example of a hardware implementation of a device employing a processing system according to some aspects of the present disclosure.

[0032] Figure 14 is a flowchart illustrating a wireless communication process supporting transmission of downlink feedback information using a downlink control information format 0_2 frame structure according to some aspects of the present disclosure.

[0033] Figure 15 is a conceptual data flow diagram illustrating the data flow between different components in an example device according to some aspects of the present disclosure.

[0034] Figure 16 is a diagram illustrating an example of a hardware implementation of a device employing a processing system according to some aspects of the present disclosure.

[0035] Detailed Description

[0036] The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

[0037] Certain aspects of a telecommunications system will now be presented with reference to various apparatuses and methods. These apparatuses and methods will be described in detail below and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0038] As an example, an element, or any portion of an element, or any combination of elements can be implemented as a "processing system" that includes one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in the processing system can execute software. Software should be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., regardless of whether it is referred to in terms of software, firmware, middleware, microcode, hardware description language, or otherwise.

[0039] Accordingly, in one or more example embodiments, the described functions can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include random access memory (RAM), read only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0040] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes base stations 102, UEs 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). The base stations 102 can include macro cells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macro cells include base stations. Small cells include femtocells, picocells, and microcells.

[0041] Base stations 102 configured for 4G LTE (collectively, evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a backhaul link 132 (e.g., S1 interface). Base stations 102 configured for 5G NR (collectively, Next Generation RAN (NG-RAN)) can interface with the core network 190 via a backhaul link 184. In addition to other functions, base stations 102 can also perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of Non-Access Stratum (NAS) messages, NAS node selection, synchronization, Radio Access Network (RAN) sharing, Multimedia Broadcast Multicast Service (MBMS), subscriber and equipment tracing, Radio Access Network Information Management (RIM), paging, positioning, and delivery of alert messages. Base stations 102 can communicate with each other directly or indirectly (e.g., via the EPC 160 or core network 190) via a backhaul link 134 (e.g., X2 interface). The backhaul link 134 can be wired or wireless.

[0042] Base station 102 may communicate wirelessly with UE 104. Each base station 102 may provide communication coverage for its respective geographical coverage area 110. There may be overlapping geographical coverage areas 110. For example, small cell 102' may have a coverage area 110' that overlaps with the coverage areas 110 of one or more macro base stations 102. A network including both small cells and macro cells may be referred to as a heterogeneous network. The heterogeneous network may also include a Home evolved Node B (HeNB) that may serve a restricted group known as a Closed Subscriber Group (CSG). The communication link 120 between base station 102 and UE 104 may include an uplink (UL) (also referred to as a reverse link) transmission from UE 104 to base station 102 and / or a downlink (DL) (also referred to as a forward link) transmission from base station 102 to UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna techniques, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links may be over one or more carriers. For each carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) for transmission in each direction, base station 102 / UE 104 may use a spectrum with a bandwidth of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.). These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL compared to UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as the Primary Cell (PCell), and the secondary component carriers may be referred to as Secondary Cells (SCells).

[0043] Some UEs 104 may communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 may use DL / UL WWAN spectrum. The D2D communication links 158 may use one or more sidelink channels, such as the Physical Sidelink Broadcast Channel (PSBCH), Physical Sidelink Discovery Channel (PSDCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Control Channel (PSCCH). D2D communication may be via a variety of wireless D2D communication systems, such as, by way of example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

[0044] The wireless communication system may further include a Wi-Fi access point (AP) 150 in communication with a Wi-Fi station (STA) 152 via a communication link 154 in the 5 GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) before communication to determine whether the channel is available.

[0045] The small cell 102' may operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102' may adopt NR and use the same 5 GHz unlicensed spectrum as that used by the Wi-Fi AP 150. The small cell 102' adopting NR in the unlicensed spectrum may boost the coverage of the access network and / or increase the capacity of the access network.

[0046] Whether the small cell 102' or a large cell (e.g., a macro base station), the base station 102 may include an eNB, a g Node B (gNB), or another type of base station. Some base stations (such as the gNB 180) may operate in traditional sub-6 GHz spectrum, millimeter wave (mmW) frequencies, and / or near mmW frequencies to communicate with the UE 104. When the gNB 180 operates in mmW or near mmW frequencies, the gNB 180 may be referred to as an mmW base station. The extremely high frequency (EHF) is a part of the RF in the electromagnetic spectrum. EHF has a range from 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. The radio waves in this frequency band may be referred to as millimeter waves. Near mmW may extend down to 3 GHz frequencies with a 100 millimeter wavelength. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, which is also referred to as centimeter waves. Communication using the mmW / near mmW radio frequency band (e.g., 3 GHz–300 GHz) has extremely high path loss and short range. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.

[0047] The base station 180 may transmit a beamformed signal to the UE 104 in one or more transmission directions 182'. The UE 104 may receive the beamformed signal from the base station 180 in one or more reception directions 182”. The UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmission directions. The base station 180 may receive the beamformed signal from the UE 104 in one or more reception directions. The base station 180 / UE 104 may perform beam training to determine the best reception direction and transmission direction for each of the base station 180 / UE 104. The transmission direction and reception direction of the base station 180 may be the same or may be different. The transmission direction and reception direction of the UE 104 may be the same or may be different.

[0048] The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may communicate with a Home Subscriber Server (HSS) 174. The MME 162 is a control node that processes signaling between the UE 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All User Internet Protocol (IP) packets are routed through the Serving Gateway 166, which is itself connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation and other functions. The PDN Gateway 172 and the BM-SC 170 are connected to IP services 176. The IP services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 may provide functions for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area for a particular broadcast service, and may be responsible for session management (start / stop) and for collecting eMBMS-related charging information.

[0049] The core network 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may communicate with a Unified Data Management (UDM) 196. The AMF 192 is a control node that processes signaling between the UE 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All User Internet Protocol (IP) packets are routed through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to IP services 197. The IP services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS streaming service, and / or other IP services.

[0050] A base station may also be referred to as a gNB, Node B, evolved Node B (eNB), access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmission reception point (TRP), or some other suitable term. Base station 102 provides an access point for UE 104 to EPC 160 or core network 190. Examples of UE 104 include cellular phones, smart phones, session initiation protocol (SIP) phones, laptop devices, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet devices, smart devices, wearable devices, vehicles, electricity meters, gas pumps, large or small kitchen appliances, healthcare devices, implants, sensors / actuators, displays, or any other similar functional devices. Some UEs 104 may be referred to as IoT devices (e.g., parking meters, fuel pumps, ovens, vehicles, heart monitors, etc.). UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

[0051] Referring again to Figure 1 , in some aspects, UE 104 may include a feedback information component 198 configured to receive DCI having a first predetermined DCI format or a second predetermined DCI format with a length less than the first predetermined DCI format from base station 102 / 180 on a first subband. Feedback information component 198 is further configured to determine the DCI indication DFI based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI when receiving the DCI having the second predetermined DCI format. Additionally, in some aspects, base station 102 / 180 may include a configuration component 199 configured to generate DCI having a first predetermined DCI format or a second predetermined DCI format with a length less than the first predetermined DCI format. Configuration component 199 is further configured to communicate the DCI indicating DFI with UE 104 on the first subband based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI when communicating the DCI having the second predetermined DCI format. Further related aspects and features are described in conjunction with Figures 4 - 16 more detail. Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar fields such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0052] Figure 2A FIG. 200 is an example diagram illustrating a first subframe within a 5G / NR frame structure. Figure 2B FIG. 230 is an example diagram illustrating DL channels within a 5G / NR subframe. Figure 2C FIG. 250 is an example diagram illustrating a second subframe within a 5G / NR frame structure. Figure 2D FIG. 280 is an example diagram illustrating UL channels within a 5G / NR subframe. The 5G / NR frame structure can be FDD, where for a particular subcarrier set (carrier system bandwidth), the subframes within that subcarrier set are dedicated to either DL or UL; or it can be TDD, where for a particular subcarrier set (carrier system bandwidth), the subframes within that subcarrier set are dedicated to both DL and UL. In the example provided by Figure 2A 、 2C the 5G / NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (mostly DL) and subframe 3 is configured with slot format 34 (mostly UL), where D is DL, U is UL, and X is for flexible use between DL / UL. Although subframes 3 and 4 are shown as having slot formats 34 and 28 respectively, any particular subframe can be configured with any one of the various available slot formats 0 - 61. Slot formats 0 and 1 are all-DL and all-UL respectively. The other slot formats 2 - 61 include a mixture of DL, UL, and flexible symbols. The UE is configured with a slot format (dynamically configured via DCI, or semi-statically / statically configured via radio resource control (RRC) signaling) by means of the received slot format indicator (SFI). Note that the following description also applies to a 5G / NR frame structure that is TDD.

[0053] Other wireless communication technologies may have different frame structures and / or different channels. One frame (10 ms) may be divided into 10 equal-sized subframes (1 ms). Each subframe may include one or more time slots. The subframe may also include mini time slots, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, while for time slot configuration 1, each time slot may include 7 symbols. The symbols on the DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power-constrained scenarios; limited to single-stream transmission). The number of time slots within a subframe is based on the time slot configuration and numerology. For time slot configuration 0, different numerologies μ from 0 to 5 respectively allow 1, 2, 4, 8, 16, and 32 time slots per subframe. For time slot configuration 1, different numerologies 0 to 2 respectively allow 2, 4, and 8 time slots per subframe. Accordingly, for time slot configuration 0 and numerology μ, there are 14 symbols per time slot and 2 μ time slots per subframe. The subcarrier spacing and symbol length / duration are dependent on the numerology. The subcarrier spacing may be equal to 2 μ *15 kHz, where μ is the numerology from 0 to 5. Thus, numerology μ = 0 has a subcarrier spacing of 15 kHz, while numerology μ = 5 has a subcarrier spacing of 480 kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A - 2D An example is provided with time slot configuration 0 having 14 symbols per time slot and numerology μ = 0 and 1 time slot per subframe. The subcarrier spacing is 15 kHz and the symbol duration is approximately 66.7 μs.

[0054] A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also known as a physical RB (PRB)) that extends over 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0055] As Figure 2A explained, some REs carry reference (pilot) signals (RSs) for the UE. The RS may include demodulation RS (DM-RS) for channel estimation at the UE (indicated as R x , where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signal (CSI-RS). The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0056] Figure 2B Examples of various DL channels within a subframe of an explanatory frame. The Physical Downlink Control Channel (PDCCH) carries DCI within one or more Control Channel Elements (CCEs), each CCE including 9 Resource Element Groups (REGs), each REG including 4 consecutive Resource Elements (REs) in an OFDM symbol. In some aspects, the DCI carries a DFI. The DFI can be used to handle the HARQ-ACK protocol in combination with CG transmission in the uplink. The DFI can be transmitted using a PDCCH scrambled with a CS-RNTI so that no new physical channel is defined. Instead, the DCI format 0_1 frame structure is reused, where the DFI flag indicates whether the rest of the DCI is to be interpreted as an uplink scheduling grant or downlink feedback information. To distinguish the use of DCI for activating / deactivating CG transmission and DFI, a 1-bit flag (used as an explicit indication) is used when configuring type 1 and / or type 2 CG PUSCH. If the DFI flag is set, the rest of the DCI is interpreted as a bit map to indicate positive or negative acknowledgments for each HARQ process included in the DFI. The DFI size can be aligned with the UL grant DCI format 0_1 size. For example, reserved bits can be included to ensure that the overall size of the DFI is equal to the DCI format 0_1 frame structure size, regardless of whether the DCI format 0_1 frame structure size carries an uplink grant or downlink feedback information, whereby the number of blind decoding attempts does not increase. In this regard, the UE blind decoding complexity does not increase due to the matching size. In some aspects, the content of the DFI includes: (1) a 1-bit UL / downlink (DL) flag, (2) a 0- or 3-bit Carrier Indicator Field (CIF), with 3 bits used in the case of configured cross-carrier scheduling, (3) a 1-bit DFI flag for distinguishing activation / deactivation based on DCI format 0_1 and DFI, (4) a 16-bit HARQ-ACK bit map, (5) a 2-bit Transmit Power Control (TPC) command, and (6) any zero-padding that matches the DCI format 0_1 frame structure length.

[0057] The primary synchronization signal (PSS) can be within symbol 2 of a specific subframe of a frame. The PSS is used by the UE 104 to determine subframe / symbol timing and the physical layer identity. The secondary synchronization signal (SSS) can be within symbol 4 of a specific subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides the number of resource blocks (RBs) in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH (such as system information blocks (SIBs)), and paging messages.

[0058] As explained in Figure 2C Some resource elements (REs) carry DM-RS for channel estimation at the base station (indicated as R for one particular configuration, but other DM-RS configurations are possible). The UE can transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS can be transmitted in the previous one or two symbols of the PUSCH. The PUCCH DM-RS can be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is transmitted and depending on the particular PUCCH format used. Although not shown, the UE can transmit sounding reference signals (SRS). The SRS can be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0059] Figure 2D An example illustrating various UL channels within a subframe of a frame. The PUCCH can be located at the position indicated in one configuration. The PUCCH carries uplink control information (UCI), such as a scheduling request, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data and can additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0060] This disclosure provides for transmitting downlink feedback information with a DCI format 0_2 frame structure to address LBT failures observed in NR-U operation while providing improved PDCCH reliability in URLLC operation. This can facilitate coordinating NR-U and UL CG enhancements in URLLC for unlicensed spectrum.

[0061] Figure 3 It is a block diagram of the base station 310 and the UE 350 in the access network being in communication. In the DL, IP packets from the EPC 160 can be provided to the controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes the Radio Resource Control (RRC) layer, and layer 2 includes the Service Data Adaptation Protocol (SDAP) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Media Access Control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with the broadcast of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction via ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functionality associated with the mapping between logical channels and transport channels, multiplexing MAC SDUs onto transport blocks (TBs), demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel priority differentiation.

[0062] The transmit (TX) processor 316 and the receive (RX) processor 370 implement the layer 1 functionality associated with various signal processing functions. Layer 1, which includes the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) encoding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The encoded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to OFDM subcarriers, multiplexed with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a stream of time-domain OFDM symbols. The OFDM stream is space precoded to generate multiple spatial streams. Channel estimates from the channel estimator 374 may be used to determine the encoding and modulation schemes and for spatial processing. The channel estimates may be derived from reference signals transmitted by the UE 350 and / or channel status feedback. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX modulates an RF carrier with the corresponding spatial stream for transmission.

[0063] At the UE 350, each receiver 354RX receives signals via its corresponding antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement the layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If there are multiple spatial streams destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then uses a fast Fourier transform (FFT) to transform the OFDM symbol stream from the time domain to the frequency domain. The frequency-domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the signal constellation points most likely transmitted by the base station 310. These soft decisions may be based on channel estimates calculated by the channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the original data and control signals transmitted by the base station 310 on the physical channel. These data and control signals are then provided to the controller / processor 359 that implements layer 3 and layer 2 functionality.

[0064] The controller / processor 359 may be associated with a memory 360 that stores program code and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using the ACK and / or NACK protocols to support HARQ operations.

[0065] Similar to the functionality described in connection with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) capture, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction via ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with the mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0066] Channel estimates derived by the channel estimator 358 from reference signals or feedback transmitted by the base station 310 may be used by the TX processor 368 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

[0067] UL transmissions are processed at the base station 310 in a manner similar to that described in connection with the receiver functionality at the UE 350. Each receiver 318RX receives signals via its respective antenna 320. Each receiver 318RX recovers the information modulated onto the RF carrier and provides the information to the RX processor 370.

[0068] The controller / processor 375 may be associated with a memory 376 that stores program code and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using the ACK and / or NACK protocols to support HARQ operations.

[0069] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform aspects in conjunction with Figure 1 the feedback component 198.

[0070] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform aspects in conjunction with Figure 1 the configuration component 199.

[0071] Figure 4 FIG. is an example illustration of a physical downlink control channel 400 for indicating downlink feedback information having a predetermined format encoded with a first scrambling code 406 in accordance with some aspects of the present disclosure. In some aspects, the present technique supports using a DCI format 0_2 frame structure to indicate DFI to the UE. As Figure 4 illustrated, the PDCCH 400 includes a DFI 402 and a CRC attachment 404. Generating the PDCCH 400 includes generating a payload that includes the DFI 402 (e.g., a0, a1, a2, …, a A-1 ). Generating the PDCCH 400 further includes appending the CRC attachment 404 (e.g., b0, b1, b2, …, b A+L-1 , where for k = 0, 1, …, A - 1, b k = a k ; for k = A, A + 1, …, A + L - 1, b k = p k-A ). In some aspects, the length of the CRC attachment 404 is 24 bits. Generating the PDCCH 400 includes encoding at least a portion of the CRC attachment 404, such as 16-bit CS-RNTI, with the first scrambling code 406 (e.g., x rnti,0 , x rnti,1 , x rnti,2 , …, x rnti,15 ). In some aspects, the PDCCH 400 uses a CRC attachment 404 scrambled by the CS-RNTI (e.g., c0, c1, c2, c A+L-1, where for k = 0, 1, …, A + 7, c k = a k ; for k = A + 8, A + 9, …, A + L - 1, c k = (b k + x rnti,k-A-8 ) mod 2) of DCI format 0_2 frame structure. In this regard, the generated PDCCH 400 includes a DFI 402, a part of the CRC attachment 404 (unscrambled), and a scrambled CRC attachment part 408. In various aspects, the PDCCH 400 is applied with channel decoding operations for transmitting the PDCCH 400. To distinguish the DCI format 0_2 frame structure for activating / deactivating CG transmission and DFI, when configuring type 1 and / or type 2 CG PUSCH, a 1-bit flag (used as an explicit indication) is used.

[0072] Figure 5 is a diagram illustrating an example of a physical downlink control channel having a predetermined format encoded with a second scrambling code for indicating downlink feedback information according to some aspects of the present disclosure. In some aspects, the present technology supports using the DCI format 0_2 frame structure to indicate DFI to a UE. As Figure 5 illustrated, the PDCCH 500 includes a DFI 502 and a CRC attachment 504. Generating the PDCCH 500 includes generating a payload including the DFI 502 (e.g., a0, a1, a2, …, a A-1 ). Generating the PDCCH 500 further includes appending the CRC attachment 504 (e.g., b0, b1, b2, …, b A+L-1 , where for k = 0, 1, …, A - 1, b k = a k ; for k = A, A + 1, …, A + L - 1, b k = p k-A ). In some aspects, the length of the CRC attachment 504 is 24 bits. Generating the PDCCH 500 includes encoding at least a part of the CRC attachment 504 with a first scrambling code 506 (e.g., x rnti,0 , x rnti,1 , x rnti,2 , …, x rnti,15 ), such as a 16-bit modulation coding scheme cell radio network temporary identifier (MCS-C-RNTI). In some aspects, the PDCCH 500 uses the CRC attachment 504 scrambled by the MCS-C-RNTI (e.g., c0, c1, c2, c A+L-1 , where for k = 0, 1, …, A + 7, c k = a k ; for k = A + 8, A + 9, …, A + L - 1, ck = (b k + x rnti,k-A-8 ) mod 2) to generate the DCI format 0_2 frame structure. In this regard, the generated PDCCH 500 includes the DFI 502, a part of the CRC attachment 504 (unscrambled), and the scrambled CRC attachment part 508. In various aspects, the PDCCH 500 is applied with channel coding operations for transmitting the PDCCH 500. To distinguish the DCI format 0_2 frame structure for activating / deactivating CG transmission and DFI, when configuring type 1 and / or type 2 CG PUSCH, a 1-bit flag is used (serving as an explicit indication).

[0073] Figure 6 is a diagram illustrating an example of a physical downlink control channel for indicating downlink feedback information having a predetermined format encoded with a third scrambling code according to some aspects of the present disclosure. In some aspects, the present technology supports using the DCI format 0_2 frame structure to indicate the DFI to the UE. As Figure 6 illustrated, the PDCCH 600 includes the DFI 602 and the CRC attachment 604. Generating the PDCCH 600 includes generating a payload including the DFI 602 (e.g., a0, a1, a2, …, a A-1 ). Generating the PDCCH600 further includes appending the CRC attachment 604 (e.g., b0, b1, b2, …, b A+L-1 , where for k = 0, 1, …, A - 1, b k = a k ; for k = A, A + 1, …, A + L - 1, b k = p k-A ). In some aspects, the length of the CRC attachment 604 is 24 bits. Generating the PDCCH600 includes encoding at least a part of the CRC attachment 604, such as 16-bit downlink feedback information radio network temporary identifier (DFI-RNTI), with the first scrambling code 606 (e.g., x rnti,0 , x rnti,1 , x rnti,2 , …, x rnti,15 ). In some aspects, the PDCCH 600 uses the CRC attachment 604 scrambled by the DFI-RNTI (e.g., c0, c1, c2, c A+L-1 , where for k = 0, 1, …, A + 7, c k = a k ; for k = A + 8, A + 9, …, A + L - 1, c k = (b k + x rnti,k-A-8) The DCI format 0_2 frame structure of (mod 2) is used to generate. In this regard, the generated PDCCH 600 includes a DFI 602, a part of the CRC attachment 604 (unscrambled), and a scrambled CRC attachment part 608. In various aspects, the PDCCH 600 is applied with channel coding operations for transmitting the PDCCH 600. To distinguish the DCI format 0_2 frame structure for activating / deactivating CG transmission and DFI, when configuring type 1 and / or type 2 CG PUSCH, different RNTIs (e.g., DFI-RNTI) are used.

[0074] Figure 7 FIG. is an example diagram illustrating a physical downlink control channel for indicating downlink feedback information having a predetermined format encoded with a fourth scrambling code according to some aspects of the present disclosure. In some aspects, the present technology supports using the DCI format 0_2 frame structure to indicate DFI to the UE. As Figure 7 illustrated, the PDCCH 700 includes a DFI 702 and a CRC attachment 704. Generating the PDCCH 700 further includes an additional CRC attachment 704 (e.g., b0, b1, b2,..., b A+L-1 , where for k = 0, 1,..., A - 1, b k = a k ; for k = A, A + 1,..., A + L - 1, b k = p k-A ). In some aspects, the length of the CRC attachment 704 is 24 bits. Generating the PDCCH 700 includes encoding a first part of the CRC attachment 704, such as 16-bit CS-RNTI, with a first scrambling code 706 (e.g., x rnti,0 , x rnti,1 , x rnti,2 ,..., x rnti,15 ). Generating the PDCCH 700 further includes encoding a second part of the CRC attachment 704, such as 8-bit DFI-RNTI, with a second scrambling code 708 (e.g., y rnti,0 , y rnti,1 , y rnti,2 ,..., y rnti,7 ). In some aspects, the PDCCH 700 uses a CRC attachment 704 scrambled by DFI-RNTI and CS-RNTI (e.g., c0, c1, c2, c A+L-1 , where for k = 0, 1,..., A - 1, c k = b k ; for k = A, A + 1,..., A + 7, c k = (b k + y rnti,k-A-8 ) mod 2; for k = A + 8, A + 9,..., A + L - 1, ck = (b k + x rnti,k-A-8 ) mod 2), the DCI format 0_2 frame structure is generated. In this regard, the generated PDCCH 700 includes a DFI 702, a first scrambled portion 710 with CRC attachment 704, and a second scrambled portion 712 with CRC attachment 704. As Figure 7 explained, the second scrambled portion 712 with an 8-bit DFI-RNTI is located before the first scrambled portion 710 with a 16-bit CS-RNTI. In one or more implementations, the first scrambled portion 710 with a 16-bit CS-RNTI may be located before the second scrambled portion 712 with an 8-bit DFI-RNTI (or the second scrambled portion 712 with an 8-bit DFI-RNTI may follow the first scrambled portion 710 with a 16-bit CS-RNTI). In various aspects, the PDCCH 700 is applied with channel coding operations for transmitting the PDCCH 700. To distinguish the DCI format 0_2 frame structure for activating / deactivating CG transmission and DFI, different RNTIs (e.g., DFI-RNTI) are used when configuring type 1 and / or type 2 CG PUSCH.

[0075] Figure 8 is a diagram illustrating an example of a downlink feedback information frame structure compared to the downlink control information format 0_2 frame structure according to some aspects of the present disclosure. In Figure 8 , the downlink feedback information frame structure 810 includes the DFI content in the DCI format 0_2 frame structure. In various aspects, the downlink feedback information frame structure 810 in the DCI format 0_2 frame structure may have DFI content that may include the following: (1) a 1-bit UL / DL flag, (2) 0 or 3 bits of CIF, where 3 bits are used in the case of configuring cross-carrier scheduling; otherwise 0 bits, (3) 0 bits or 1 bit of DFI flag, where if the DFI frame structure described in Figure 4 and 5 is used, 1 bit is used, or if the DFI frame structure described in Figure 6 and 7 is used, 0 bits are used, (4) a 16-bit HARQ-ACK bit mapping, (5) 2-bit transmit power control (TPC) commands, and (6) any zero-padding (if any) that matches the length of the DCI format 0_2 frame structure.

[0076] In some implementations, if CS-RNTI scrambling CRC attachment (e.g., 404) is used for DFI, the DFI flag bit value can be set to 0 to indicate active type 2 CG transmission, or the DFI flag bit value can be set to 1 to indicate CG-DFI. In other implementations, for DCI format 0_2 frame structures with CRC attachment scrambled by cell RNTI (C-RNTI) / semi-persistent channel state information RNTI (SP-CSI-RNTI) / MCS-C-RNTI and for operation in a cell with shared spectrum channel access, the DFI flag is reserved. In some implementations, if MCS-C-RNTI scrambling CRC attachment (e.g., 504) is used for DFI, the DFI flag bit value can be set to 0 to indicate UL scheduling, or the DFI flag bit value can be set to 1 to indicate CG-DFI. In other implementations, for DCI format 0_2 frame structures with CRC attachment scrambled by C-RNTI / SP-CSI-RNTI / CS-RNTI and for operation in a cell with shared spectrum channel access, the DFI flag is reserved.

[0077] In some aspects, the HARQ-ACK field includes a bit mapping field. The bit mapping field can have a length of 16 bits. The order of the bit mapping field can be set by HARQ process index mapping such that the HARQ process index is mapped in ascending order from the most significant bit (MSB) to the least significant bit (LSB) of the bit mapping field. For each bit of the bit mapping field, a bit value of 1 indicates an acknowledgement (ACK), and a bit value of 0 indicates a negative ACK (NACK). In some aspects, the length of the TPC command field is 2 bits. All remaining bits of the DFI frame structure, if any, can be added with padding bits 812 (e.g., each padding bit set to zero) to match the length of the DCI format 0_2 frame structure.

[0078] Also in Figure 8 it, the downlink feedback information frame structure 820 has a DFI size aligned with the size of the UL grant DCI format 0_2 822, such that the UE blind decoding complexity is not increased due to the matching size. If the downlink feedback information frame structure 820 has a DFI size smaller than the size of the UL grant DCI format 0_2 822, padding bits 824 (e.g., each padding bit set to zero) can be appended to the tail end of the downlink feedback information frame structure 820 until the DFI size is equal to the size of the UL grant DCI format 0_2 822.

[0079] Also in Figure 8In [Figure], the downlink feedback information frame structure 830 has a DFI size that is aligned with the size of the UL grant DCI format 0_2 832. If the downlink feedback information frame structure 830 has a DFI size that is greater than the size of the UL grant DCI format 0_2 832 (or if the size of the UL grant DCI format 0_2 832 is less than the DFI size of the downlink feedback information frame structure 830), padding bits 834 (e.g., each padding bit is set to zero) can be appended to the end of the downlink feedback information frame structure 830 until the size of the UL grant DCI format 0_2 832 is equal to the size of the downlink feedback information frame structure 830.

[0080] Figure 9 is a diagram illustrating an example of a modification to a downlink feedback information frame structure corresponding to a downlink control information format 0_2 frame structure in accordance with some aspects of the present disclosure. In Figure 9 In [Figure], the downlink feedback information frame structure 910 includes the DFI content in the DCI format 0_2 frame structure. The downlink feedback information frame structure 910 has a DFI size that is greater than the size of the UL grant DCI format 0_2 (e.g., 922). In this aspect, the downlink feedback information frame structure 910 can be truncated to remove one or more bits from the downlink feedback information frame structure 910. In some aspects, depending on the implementation, these removed bits may be considered unimportant or unused. In various aspects, the bits removed for truncation can be located within the bit mapping field of the HARQ-ACK portion of the downlink feedback information frame structure 910. As Figure 9 illustrated in [Figure], the X most significant bits (e.g., 912) in the HARQ-ACK bit mapping field can be truncated to ensure that the DFI size of the downlink feedback information frame structure 910 is equal to the size of the UL grant DCI format 0_2 (e.g., 922). In some aspects, the truncated bits can correspond to the respective HARQ processes.

[0081] Also in Figure 9In [the figure], the downlink feedback information frame structure 920 includes a DFI size corresponding to the size of the truncated UL grant DCI format 0_2 (e.g., 922). In some aspects, the order of bit mapping to the HARQ process index mapping is such that the HARQ process index is mapped in ascending order from the MSB to the LSB of the truncated HARQ-ACK bit mapping field (e.g., 930). In other aspects, the order of bit mapping field to HARQ process index mapping is such that the configured HARQ process index is mapped in ascending order from the MSB to the LSB of the truncated HARQ-ACK bit mapping field (e.g., 940). In some aspects, if the number of bits in the truncated HARQ-ACK bit mapping field is greater than the number of configured HARQ processes, each of the remaining bits in the HARQ-ACK bit mapping field is set to zero. In some aspects, the order of the bit mapping field 1030 can be applied to CG transmission.

[0082] Figure 10 is a diagram illustrating another example of a modification to a downlink feedback information frame structure corresponding to a downlink control information format 0_2 frame structure according to some aspects of the present disclosure. In Figure 10 In [the figure], the downlink feedback information frame structure 1010 includes the DFI content in the DCI format 0_2 frame structure. The downlink feedback information frame structure 1010 has a DFI size greater than the size of the UL grant DCI format 0_2 (e.g., 1022). In this aspect, the downlink feedback information frame structure 1010 can be truncated to remove one or more bits from the downlink feedback information frame structure 1010. In some aspects, depending on the implementation, these removed bits may be considered unimportant or unused. In various aspects, the bits removed for truncation can be located within the bit mapping field of the HARQ-ACK portion of the downlink feedback information frame structure 1010. As Figure 10 illustrated in [the figure], X LSB bits (e.g., 1012) in the HARQ-ACK bit mapping field can be truncated to ensure that the DFI size of the downlink feedback information frame structure 1010 is equal to the size of the UL grant DCI format 0_2 (e.g., 1022). In some aspects, the truncated bits can correspond to the respective HARQ processes.

[0083] Also in Figure 10In [the context], the downlink feedback information frame structure 1020 includes a DFI size corresponding to the size of the truncated UL grant DCI format 0_2 (e.g., 1022). In some aspects, the order of bit mapping to the HARQ process index mapping is such that the HARQ process index (e.g., 1030) is mapped in ascending order from the MSB to the LSB of the truncated HARQ-ACK bit mapping field. In other aspects, the order of the bit mapping field to the HARQ process index mapping is such that the configured HARQ process index (e.g., 1040) is mapped in ascending order from the MSB to the LSB of the truncated HARQ-ACK bit mapping field. In some aspects, if the number of bits in the truncated HARQ-ACK bit mapping field is greater than the number of configured HARQ processes, each of the remaining bits in the HARQ-ACK bit mapping field is set to zero. In some aspects, the order of the bit mapping field 1030 can be applied to CG transmission.

[0084] In some implementations, for a UE configured to monitor downlink control information having a DCI format 0_1 frame structure or a DCI format 0_2 frame structure, the DFI content can be included in both the DCI format 0_1 frame structure and the DCI format 0_2 frame structure. In this regard, the UE can blindly decode each DCI to determine whether the DCI indicates a DFI or another purpose. In other implementations, for a UE configured to monitor downlink control information having a DCI format 0_1 frame structure or a DCI format 0_2 frame structure, the DFI content can be exclusively included in the DCI format 0_2 frame structure. In this regard, a 1-bit DFI flag can be excluded from the downlink control information having a DCI format 0_1 frame structure.

[0085] Figure 11 FIG. 1100 is a flow chart illustrating a wireless communication process that supports transmitting downlink feedback information using downlink control information format 0_2, in accordance with some aspects of the present disclosure. The process may be performed by a UE (e.g., UE 104, 350, device 1202, processing system 1314, which may include a memory 360 and may be the entire UE 350 or a component of the UE 350 (such as a TX processor 368, an RX processor 356, and / or a controller / processor 359)). Optional aspects are illustrated by dashed lines.

[0086] At 1102, the UE may receive DCI with a first predetermined DCI format or a second predetermined DCI format from the base station on a first sub - band. In some aspects, the first predetermined DCI format includes the DCI format 0_1 frame structure, and the second predetermined DCI format includes the DCI format 0_2 frame structure. In some aspects, the second predetermined DCI format has a length less than that of the first predetermined DCI format. In some aspects, the DCI may be received via a first PDCCH among multiple PDCCHs multiplexed in time or frequency on the first sub - band. For example, 1102 may be performed by Figure 12 the receiving component 1204 of Figure 12 and decoded by the decoding component 1208 of

[0087] At 1104, the UE may determine whether type 1 and / or type 2 CG PUSCH is configured. For example, 1104 may be performed by Figure 12 the determination component 1210 of

[0088] If the UE determines that type 1 and / or type 2 CG PUSCH is configured, the process proceeds to 1106. Otherwise, the process proceeds to 1108. Figure 12

[0089] Figure 12 At 1106, the UE may determine whether the first PDCCH with the DCI format 0_2 frame structure indicates activation / deactivation of CG transmission (or uplink scheduling grant) or DFI. For example, 1106 may be performed by Figure 12 the determination component 1210 of

[0090] Figure 12 If the UE determines that the first PDCCH with the DCI format 0_2 frame structure indicates activation / deactivation of CG transmission (or uplink scheduling grant), the process proceeds to 1110. Otherwise, when the UE determines that the first PDCCH with the DCI format 0_2 frame structure indicates DFI, the process proceeds to 1108.

[0089] At 1108, when receiving DCI with the second predetermined DCI format, the UE may determine that the DCI indicates DFI based on one or more of the indication in the DCI or the first predetermined scrambling code associated with the DCI. For example, 1108 may be performed by Figure 12 the determination component 1210 of

[0090] In some aspects, the first predetermined scrambling code may include a configured scheduling radio network temporary identifier. In other aspects, the first predetermined scrambling code may include a modulation and coding scheme cell radio network temporary identifier. In still other aspects, the first predetermined scrambling code may include a downlink feedback information radio network temporary identifier. In various aspects, the indication in the DCI corresponds to the position in the DFI. In some aspects, the indication in the DCI includes a DFI flag indicating a first value corresponding to activation / deactivation of a configured grant (CG) transmission or uplink scheduling grant or a second value corresponding to CG - DFI.

[0090] At 1110, when receiving DCI with a second predetermined DCI format, the UE may determine that the DCI indicates activation / deactivation of CG transmission (or uplink scheduling grant). For example, 1108 may be performed by Figure 12 the determination component 1210. In some aspects, the UE may use the DFI-RNTI to decode at least a portion of the CRC attachment in the DCI to determine that the DCI indicates the DFI. In this regard, the DFI-RNTI is used to infer the indication of the DFI within the DCI format 0_2 frame structure. In other aspects, the CRC attachment includes a first portion encoded with a first predetermined scrambling code and a second portion encoded with a second predetermined scrambling code. For example, the first predetermined scrambling code may include the configured scheduling radio network temporary identifier, and the second predetermined scrambling code may include the downlink feedback information radio network temporary identifier. In this regard, using the DFI-RNTI to decode the second portion of the CRC attachment may infer the indication of the DFI within the DCI format 0_2 frame structure.

[0091] Figure 12 FIG. 1200 is a conceptual data flow diagram illustrating the data flow between different devices / components in the exemplary device 1202. The device 1202 may be a UE or a component of a UE (e.g., such as UE 104, 350). The device 1202 may include a receiving component 1204, a transmitting component 1206, a decoding component 1208, and a determination component 1210.

[0092] The receiving component 1204 may be configured to receive signals and / or other information from other devices, including, for example, the base station 1250. The signals / information received by the receiving component 1204 may be provided to one or more components of the device 1202 for further processing and use when performing various operations according to the methods discussed above in the process including the flow chart 1100. Thus, via the receiving component 1204, the device 1202 and / or one or more of its components receive signals and / or other information (e.g., such as data for the device 1202, downlink control information, downlink feedback information, and / or other control signaling) from the base station 1250, as discussed above and also more specifically below.

[0093] In some implementations, the decoding component 1208 may be configured to decode (e.g., via the receiving component 1204 from the base station 1250) DCI having a first predetermined DCI format or a second predetermined DCI format, e.g., as combined with Figure 11as described by box 1106 of. In some aspects, the first predetermined DCI format includes the DCI format 0_1 frame structure, and the second predetermined DCI format includes the DCI format 0_2 frame structure. In some aspects, the second predetermined DCI format has a length less than that of the first predetermined DCI format. In some aspects, DCI can be received via the first PDCCH among multiple PDCCHs multiplexed in time or frequency on the first subband. In some aspects, the decoding component 1208 can use CS-RNTI to decode at least a portion of the CRC attachment. In some aspects, the decoding component 1208 can use MCS-C-RNTI to decode at least a portion of the CRC attachment. In some aspects, the decoding component 1208 can use DFI-RNTI to decode at least a portion of the CRC attachment. In some aspects, the decoding component 1208 can use CS-RNTI to decode the first portion of the CRC attachment and use DFI-RNTI to decode the second portion of the CRC attachment.

[0094] The determination component 1210 can be configured to determine whether type 1 and / or type 2 CG PUSCH is configured, for example, as described in connection with Figure 11 box 1104 of. In some aspects, when type 1 and / or type 2 CG PUSCH is configured, the determination component 1210 can use an indication in the DCI to determine whether the first PDCCH having the DCI format 0_2 frame structure indicates activation / deactivation of CG transmission or DFI, for example, as described in connection with Figure 11 box 1106 of.

[0095] According to the method disclosed herein, the transmission component 1206 can be configured to transmit various messages to one or more external devices (such as including the base station 1250). The message / signal to be transmitted can be generated by one or more other components as discussed above, or the message / signal to be transmitted can be generated by the transmission component 1206 under the indication / control of one or more other components as discussed above. Thus, in various configurations, via the transmission component 1206, the device 1202 and / or one or more components thereof transmit signals and / or other information (such as, for example, uplink communication and / or other signals) to an external device (such as the base station 1250).

[0096] The device 1202 may include additional components that execute each box of the algorithms in the foregoing flowcharts of Figure 11 . Thus, Figure 11 each box in the foregoing flowcharts of can be executed by a component and the device may include one or more of those components. These components can be one or more hardware components specifically configured to execute the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0097] Figure 13 FIG. 1300 is an example diagram illustrating a hardware implementation of an apparatus 1202' that employs a processing system 1314. The processing system 1314 can be implemented to have a bus architecture generally represented by a bus 1324. Depending on the particular application and overall design constraints of the processing system 1314, the bus 1324 can include any number of interconnected buses and bridges. The bus 1324 links together various circuits, including one or more processors and / or hardware components (represented by processor 1304, components 1204, 1206, 1208, 1210, and computer-readable medium / memory 1322). The bus 1324 can also link various other circuits, such as a timing source, peripherals, voltage regulators, and power management circuits, which are well known in the art and will not be described further herein.

[0098] The processing system 1314 can be coupled to a transceiver 1330. The transceiver 1330 is coupled to one or more antennas 1332. The transceiver 1330 provides means for communicating with various other devices via a transmission medium. The transceiver 1330 receives signals from the one or more antennas 1332, extracts information from the received signals, and provides the extracted information to the processing system 1314 (specifically, the receiving component 1204). Additionally, the transceiver 1330 receives information from the processing system 1314 (specifically, the transmitting component 1216) and generates signals to be applied to the one or more antennas 1332 based on the received information. The processing system 1314 includes a processor 1320 coupled to the computer-readable medium / memory 1322. The processor 1320 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory 1322. The software, when executed by the processor 1320, causes the processing system 1314 to perform the various functions described above for any particular apparatus. The computer-readable medium / memory 1322 can also be used to store data manipulated by the processor 1320 when executing the software. The processing system 1314 further includes at least one of the components 1204, 1206, 1208, 1210. These components can be software components running in the processor 1320, software components resident / stored in the computer-readable medium / memory 1322, one or more hardware components coupled to the processor 1320, or some combination thereof. The processing system 1314 can be a component of the UE 350 and can include a memory 360 and / or at least one of the following: a TX processor 368, an RX processor 356, and a controller / processor 359. Alternatively, the processing system 1314 can be the entire UE (e.g., see Figure 3 of 350).

[0099] In one configuration, the device 1202 / 1202' is a UE for wireless communication, which includes means for receiving DCI having a first predetermined DCI format or a second predetermined DCI format from a base station on a first sub-band, the second predetermined DCI format having a length less than that of the first predetermined DCI format. The device further includes means for determining that the DCI indicates a DFI based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI when the DCI having the second predetermined DCI format is received.

[0100] The foregoing means may be one or more components of the foregoing components of the device 1202 and / or the processing system 1314 of the device 1202' configured to perform the functions recited by the foregoing means. As described above, the processing system 1314 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Thus, in one configuration, the foregoing means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the foregoing means.

[0101] Figure 14 FIG. 1400 is a flow chart of an example method of wireless communication in accordance with aspects presented herein that supports the use of downlink control information format 0_2 to transmit downlink feedback information. The method may be performed by a base station (e.g., base station 102, 180, 310, device 1502; processing system 1614, which may include a memory 376 and may be the entire base station 310 or a component of the base station 310 (such as a TX processor 316, an RX processor 370, and / or a controller / processor 375)). Optional aspects are illustrated in dashed lines.

[0102] At 1402, the BS may generate DCI having a first predetermined DCI format or a second predetermined DCI format. In some aspects, the second predetermined DCI format has a length less than that of the first predetermined DCI format. For example, 1402 may be performed by Figure 15 the generating component 1508. In the context of Figure 1 and 3 for example, the BS 102 / 180 / 310 may generate DCI having a first predetermined DCI format or a second predetermined DCI format.

[0103] At 1404, the BS may determine whether the DFI size is different from the DCI format 02 size. If the BS determines that the DFI size is different from the DCI format 0_2 size, the process proceeds to 1406. Otherwise, the process proceeds to 1408. In Figure 1 and 3In the context of, for example, BS 102 / 180 / 310 may determine whether the DFI size is different from the DCI format 0_2 size.

[0104] At 1406, the BS may determine whether a first length of the DFI is less than a second length of the DCI format 0_2 frame structure. For example, 1406 may be performed by the determination component 1510 in cooperation with Figure 15 the modified component 1512. In Figure 1 and 3 In the context of, for example, BS 102 / 180 / 310 may determine whether a first length of the DFI is less than a second length of the DCI format 0_2 frame structure. In some aspects, the BS may modify the DFI or the DCI format 0_2 frame structure based on the determination. In one or more implementations, when the first length of the DFI is less than the second length of the DCI format 0_2 frame structure, the BS may modify the first length of the DFI by appending zeros to the DFI until the first length of the DFI is equal to the second length of the DCI format 0_2 frame structure. In one or more implementations, when the first length of the DFI is not less than (or greater than) the second length of the DCI format 0_2 frame structure, the BS may configure the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by appending zero-padding bits at the end of the DCI format 0_2 frame structure. In one or more implementations, when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, the BS may configure the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more MSBs of the bit mapping field in the DFI. In one or more implementations, the BS may configure the bit mapping field in the DFI by mapping the HARQ process index in ascending order from the MSB to the LSB of the truncated bit mapping field. In one or more implementations, the BS may configure the bit mapping field in the DFI by mapping the configured HARQ process in ascending order from the MSB to the LSB of the truncated bit mapping field. In some aspects, the BS may determine whether the number of bits of the truncated bit mapping field is greater than the number of configured HARQ processes, and when the number of bits of the truncated bit mapping field is greater than the number of configured HARQ processes, may configure the remaining bits in the bit mapping field with zeros. In other implementations, when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, the BS may configure the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more LSBs of the bit mapping field in the DFI.

[0105] At 1408, the BS may encode at least a portion of the CRC attachment with a first predetermined scrambling code. For example, 1404 may be performed by Figure 15is performed by the encoding component 1514. In Figure 1 and 3 contexts, for example, BS 102 / 180 / 310 may encode at least a portion of the CRC attachment with a first predetermined scrambling code. In some aspects, the BS may generate DCI by encoding at least a portion of the CRC attachment with a first predetermined scrambling code. In one example, the BS may use CS-RNTI to encode at least this portion of the CRC attachment. In another example, the BS may use MCS-C-RNTI to encode at least this portion of the CRC attachment. In another example, the BS may use DFI-RNTI to encode at least this portion of the CRC attachment. In another example, the BS may use CS-RNTI to encode a first portion of the CRC attachment and use DFI-RNTI to encode a second portion of the CRC attachment.

[0106] At 1410, when communicating DCI having a second predetermined DCI format, the BS may be configured to communicate with the UE the DCI indicating the DFI on a first sub-band based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI. For example, 1410 may be performed by Figure 15 the configuration component 1516 through Figure 15 the transmission component 1506. In Figure 1 and 3 contexts, for example, BS 102 / 180 / 310 may use the DCI format 0_2 frame structure to transmit the DCI indicating the DFI.

[0107] Figure 15 is a conceptual data flow diagram 1500 illustrating the data flow between different devices / components in the exemplary device 1502. The device may be a base station or a component of a base station (e.g., such as base stations 102, 180, 310). For purposes of discussion, we may consider that the device 1502 may correspond to Figure 1 the base station 102 shown in

[0108] The receiving component 1504 may be configured to: receive signals and / or other information from other devices (including, for example, UE 1550). The signals / information received by the receiving component 1504 may be provided to one or more components of the device 1502 for further processing and use when performing various operations according to the above-discussed methods including the method of flowchart 1400. Thus, via the receiving component 1504, the device 1502 and / or one or more components therein receive signals and / or other information (e.g., such as uplink communications and / or other signals) from the UE 1550, as discussed above and also more specifically below.

[0109] The generating component 1508 may generate DCI having a first predetermined DCI format or a second predetermined DCI format, as described in connection with Figure 14 block 1402. In some aspects, the second predetermined DCI format has a length less than that of the first predetermined DCI format.

[0110] The determining component 1510 may determine whether the DFI size is different from the DCI format 0_2 size, as described in connection with Figure 14 block 1404. In some aspects, the determining component 1510 may determine whether a first length of the DFI is less than a second length of the DCI format 0_2 frame structure.

[0111] The modifying component 1512 may modify the DFI or the DCI format 0_2 frame structure based on the determination. In one or more implementations, when the first length of the DFI is less than the second length of the DCI format 02 frame structure, the modifying component 1512 may modify the first length of the DFI by appending zeros to the DFI until the first length of the DFI equals the second length of the DCI format 0_2 frame structure.

[0112] The encoding component 1514 may encode at least a portion of the CRC attachment with a first predetermined scrambling code. In some aspects, the generating component 1508, in coordination with the encoding component 1514, may generate DCI by encoding at least a portion of the CRC attachment with the first predetermined scrambling code. In one example, the encoding component 1514 may use CS-RNTI to encode at least a portion of the CRC attachment. In another example, the encoding component 1514 may use MCS-C-RNTI to encode the at least a portion of the CRC attachment. In another example, the encoding component 1514 may use DFI-RNTI to encode the at least a portion of the CRC attachment. In another example, the encoding component 1514 may use CS-RNTI to encode a first portion of the CRC attachment and use DFI-RNTI to encode a second portion of the CRC attachment.

[0113] When the first length of the DFI is not less than (or greater than) the second length of the DCI format 0_2 frame structure, the configuration component 1516 can, in coordination with the modification component 1512, configure the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by appending zero-padding bits at the end of the DCI format 0_2 frame structure. In one or more implementations, when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, the configuration component 1516 can configure the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more MSBs of the bit mapping field in the DFI. In one or more implementations, the configuration component 1516 can configure the bit mapping field in the DFI by mapping the HARQ process index in ascending order from the MSB to the LSB of the truncated bit mapping field. In one or more implementations, the configuration component 1516 can configure the bit mapping field in the DFI by mapping the configured HARQ process in ascending order from the MSB to the LSB of the truncated bit mapping field. In some aspects, the configuration component 1516 can determine whether the number of bits in the truncated bit mapping field is greater than the number of configured HARQ processes, and when the number of bits in the truncated bit mapping field is greater than the number of configured HARQ processes, can configure the remaining bits in the bit mapping field with zeros. In other implementations, when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, the configuration component 1516 can configure the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more LSBs of the bit mapping field in the DFI.

[0114] According to the method disclosed herein, the transmission component 1506 can be configured to convey the above-discussed information to one or more external devices (such as including UE 1550). The message to be conveyed can be included in a message / signal generated by one or more other components as discussed above, or the message / signal to be conveyed can be generated by the transmission component 1506 under the indication / control of one or more other components as discussed above. Thus, in various configurations, via the transmission component 1506, the device 1502 and / or one or more components thereof convey a signal including the above-discussed information (e.g., such as data for the device 1502, downlink control information, downlink feedback information, and / or other control signaling) to an external device (such as UE 1550). In some aspects, when conveying DCI having a second predetermined DCI format, the transmission component 1506, in coordination with the configuration component 1516, can convey the DCI indication DFI to the UE on a first subband based on one or more of the indications in the DCI or a first predetermined scrambling code associated with the DCI.

[0115] The device may include additional components that perform each block of the algorithm in the foregoing flowchart Figure 14 Thus, Figure 14 each block in the foregoing flowchart may be performed by a component and the device may include one or more of those components. These components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0116] Figure 16 FIG. 1600 is an example diagram illustrating a hardware implementation of a device 1502' that employs a processing system 1614. The processing system 1614 may be implemented to have a bus architecture generally represented by a bus 1624. Depending on the particular application and overall design constraints of the processing system 1614, the bus 1624 may include any number of interconnecting buses and bridges. The bus 1624 links together various circuits, including one or more processors and / or hardware components (represented by processors 1620, components 1504, 1506, 1508, 1510, 1512, 1514, 1516, and computer-readable medium / memory 1622). The bus 1624 may also link various other circuits, such as a timing source, peripherals, voltage regulators, and power management circuits, which are well known in the art and will not be described further herein.

[0117] The processing system 1614 can be coupled to the transceiver 1630. The transceiver 1630 is coupled to one or more antennas 1632. The transceiver 1630 provides means for communicating with various other devices via a transmission medium. The transceiver 1630 receives signals from the one or more antennas 1632, extracts information from the received signals, and provides the extracted information to the processing system 1614 (specifically, the receiving component 1504). Additionally, the transceiver 1630 receives information from the processing system 1614 (specifically, the transmitting component 1506) and generates signals to be applied to the one or more antennas 1632 based on the received information. The processing system 1614 includes a processor 1620 coupled to a computer-readable medium / memory 1622. The processor 1620 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory 1622. The software, when executed by the processor 1620, causes the processing system 1614 to perform the various functions described above for any particular device. The computer-readable medium / memory 1622 can also be used to store data manipulated by the processor 1620 when executing the software. The processing system 1614 further includes at least one of the components 1504, 1506, 1508, 1510, 1512, 1514, 1516. These components can be software components running in the processor 1620, software components resident / stored in the computer-readable medium / memory 1622, one or more hardware components coupled to the processor 1620, or some combination thereof. The processing system 1614 can be a component of the base station 310 and can include the memory 376 and / or at least one of the following: a TX processor 316, an RX processor 370, and a controller / processor 375.

[0118] In one configuration, the device 1502 / 1502' is a base station that includes means for generating DCI having a first predetermined DCI format or a second predetermined DCI format, the second predetermined DCI format having a length less than the first predetermined DCI format. When communicating the DCI having the second predetermined DCI format, the device further includes means for communicating the DCI indication DFI to the UE on a first subband based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI.

[0119] The foregoing means can be the foregoing components of the device 1502 and / or one or more components of the processing system 1614 of the device 1502' that are configured to perform the functions recited by the foregoing means. As described above, the processing system 1614 can include a TX processor 316, an RX processor 370, and a controller / processor 375. Thus, in one configuration, the foregoing means can be the TX processor 316, the RX processor 370, and the controller / processor 375 that are configured to perform the functions recited by the foregoing means.

[0120] The following examples are illustrative only and may be combined with aspects of other embodiments or teachings described herein without limitation.

[0121] Example 1 is a method of wireless communication at a UE, including: receiving, from a base station on a first subband, downlink control information (DCI) having a first predetermined DCI format or a second predetermined DCI format, the second predetermined DCI format having a length less than that of the first predetermined DCI format; and when receiving the DCI having the second predetermined DCI format, determining that the DCI indicates downlink feedback information (DFI) based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI.

[0122] In Example 2, the method of Example 1 further includes: the first predetermined DCI format includes a DCI format 0_1 frame structure, and the second predetermined DCI format includes a DCI format 0_2 frame structure.

[0123] In Example 3, the method of any one of Example 1 or Example 2 further includes: the first subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in time or frequency, receiving the DCI includes receiving a first PDCCH among the plurality of PDCCHs from the base station on the first subband, the first PDCCH includes the DFI and a cyclic redundancy check (CRC) attachment, and at least a part of the CRC attachment is encoded with the first predetermined scrambling code.

[0124] In Example 4, the method of any one of Example 1 to Example 3 further includes: the first predetermined scrambling code includes a configured scheduling radio network temporary identifier (CS-RNTI).

[0125] In Example 5, the method of any one of Example 1 to Example 4 further includes: determining whether type 1 and / or type 2 configured grant (CG) physical uplink shared channels (PUSCHs) are configured; and when the type 1 and / or type 2 CG PUSCHs are configured, using the indication in the DCI to determine whether the first PDCCH having the DCI format 0_2 frame structure indicates activation / deactivation of CG transmission or the DFI.

[0126] In Example 6, the method of any one of Example 1 to Example 5 further includes: the first predetermined scrambling code includes a modulation and coding scheme cell radio network temporary identifier (MCS-C-RNTI).

[0127] In Example 7, the method of any one of Examples 1 to 6 further includes: determining whether a Type 1 and / or Type 2 Configured Grant (CG) Physical Uplink Shared Channel (PUSCH) is configured; and when the Type 1 and / or Type 2 CG PUSCH is configured, using the indication in the DCI to determine whether the first PDCCH with the DCI format 0_2 frame structure indicates an uplink scheduling grant or the DFI.

[0128] In Example 8, the method of any one of Examples 1 to 7 further includes: the first predetermined scrambling code includes a Downlink Feedback Information Radio Network Temporary Identifier (DFI-RNTI).

[0129] In Example 9, the method of any one of Examples 1 to 8 further includes: determining that the DCI indicates the DFI includes using the DFI-RNTI to decode at least a portion of the CRC attachment.

[0130] In Example 10, the method of any one of Examples 1 to 9 further includes: the CRC attachment includes a first portion encoded with the first predetermined scrambling code and a second portion encoded with a second predetermined scrambling code.

[0131] In Example 11, the method of any one of Examples 1 to 10 further includes: the first predetermined scrambling code includes a Configured Scheduling Radio Network Temporary Identifier (CS-RNTI), and the second predetermined scrambling code includes a Downlink Feedback Information Radio Network Temporary Identifier (DFI-RNTI).

[0132] In Example 12, the method of any one of Examples 1 to 11 further includes: the DFI-RNTI in the second predetermined scrambling code has a first length, and the CS-RNTI in the first predetermined scrambling code has a second length greater than the first length.

[0133] In Example 13, the method of any one of Examples 1 to 12 further includes: determining that the DCI indicates the DFI includes using the DFI-RNTI to decode at least the second portion of the CRC attachment.

[0134] In Example 14, the method of any one of Examples 1 to 13 further includes: the DFI has a first length corresponding to a second length of an uplink scheduling grant with the DCI format 0_2 frame structure.

[0135] In Example 15, the method of any one of Examples 1 to 14 further includes: the indication in the DCI corresponds to a position in the DFI, and the indication in the DCI includes a DFI flag indicating a first value corresponding to activation / deactivation of a Configured Grant (CG) transmission or an uplink scheduling grant or a second value corresponding to a CG-DFI.

[0136] In Example 16, the method of any one of Examples 1 to 15 further includes: the UE being configured to monitor the DCI having the first predetermined DCI format or the second predetermined DCI format, and the DFI being included in the DCI having the first predetermined DCI format or the second predetermined DCI format, determining to perform a blind decoding operation on the DCI with the first predetermined DCI format or the second predetermined DCI format to determine whether the DCI indicates the DFI.

[0137] In Example 17, the method of any one of Examples 1 to 15 further includes: the UE being configured to monitor the DCI having the first predetermined DCI format or the second predetermined DCI format, the DFI being included in the DCI exclusively having the second predetermined DCI format, and the indication in the DCI indicating whether the DFI is included in the DCI being excluded from the DCI having the first predetermined DCI format.

[0138] Example 18 is an apparatus that includes one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause a system or device to implement the method of any one of Examples 1 to 17.

[0139] Example 19 is a system or device that includes means for implementing the method of any one of Examples 1 to 17 or means for implementing the apparatus of any one of Examples 1 to 17.

[0140] Example 20 is a non-transitory computer-readable medium that stores instructions executable by one or more processors to cause the one or more processors to implement the method of any one of Examples 1 to 17.

[0141] Example 21 is a method for wireless communication at a base station, including: generating a DCI having a first predetermined downlink control information (DCI) format or a second predetermined DCI format, the second predetermined DCI format having a length less than the first predetermined DCI format; and when communicating the DCI having the second predetermined DCI format, communicating the DCI indicating downlink feedback information (DFI) to a user equipment (UE) on a first subband based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI.

[0142] In Example 22, the method of Example 21 further includes: the first predetermined DCI format includes a DCI format 0_1 frame structure, and the second predetermined DCI format includes a DCI format 0_2 frame structure.

[0143] In Example 23, the method of either Example 21 or Example 22 further comprises: the first sub-band includes a plurality of physical downlink control channels (PDCCHs) multiplexed in time or frequency, conveying the DCI includes transmitting, on the first sub-band, a first PDCCH among the plurality of PDCCHs to the UE, and the first PDCCH includes the DFI and a cyclic redundancy check (CRC) attachment.

[0144] In Example 24, the method of any one of Examples 21 to 23 further comprises: generating the DCI includes: encoding at least a portion of the CRC attachment with the first predetermined scrambling code.

[0145] In Example 25, the method of any one of Examples 21 to 24 further comprises: the first predetermined scrambling code includes a configured scheduling radio network temporary identifier (CS-RNTI).

[0146] In Example 26, the method of any one of Examples 21 to 25 further comprises: the first predetermined scrambling code includes a modulation and coding scheme cell radio network temporary identifier (MCS-C-RNTI).

[0147] In Example 27, the method of any one of Examples 21 to 26 further comprises: the first predetermined scrambling code includes a downlink feedback information radio network temporary identifier (DFI-RNTI).

[0148] In Example 28, the method of any one of Examples 21 to 27 further comprises: encoding at least a portion of the CRC attachment includes encoding at least a portion of the CRC attachment using the DFI-RNTI.

[0149] In Example 29, the method of any one of Examples 21 to 28 further comprises: the CRC attachment includes a first portion encoded with the first predetermined scrambling code and a second portion encoded with a second predetermined scrambling code.

[0150] In Example 30, the method of any one of Examples 21 to 29 further comprises: encoding at least a portion of the CRC attachment includes encoding at least the second portion of the CRC attachment using the DFI-RNTI.

[0151] In Example 31, the method of any one of Examples 21 to 30 further comprises: the first predetermined scrambling code includes a configured scheduling radio network temporary identifier (CS-RNTI), and the second predetermined scrambling code includes a downlink feedback information radio network temporary identifier (DFI-RNTI).

[0152] In Example 32, the method of any one of Examples 21 to 31 further includes: the DFI-RNTI in the second predetermined scrambling code has a first length, and the CS-RNTI in the first predetermined scrambling code has a second length greater than the first length.

[0153] In Example 33, the method of any one of Examples 21 to 32 further includes: the indication in the DCI corresponds to a position in the DFI, and the indication in the DCI includes a DFI flag indicating a first value corresponding to activation / deactivation of a configured grant (CG) transmission or an uplink scheduling grant or a second value corresponding to a CG-DFI.

[0154] In Example 34, the method of any one of Examples 21 to 33 further includes: the DFI has a first length that is a second length corresponding to an uplink scheduling grant having a DCI format 0_2 frame structure.

[0155] In Example 35, the method of any one of Examples 21 to 34 further includes: the DFI has a first length that is a second length corresponding to the DCI format 0_2 frame structure.

[0156] In Example 36, the method of any one of Examples 21 to 35 further includes: determining whether the first length of the DFI is less than the second length of the DCI format 0_2 frame structure; and modifying the DFI or the DCI format 0_2 frame structure based on the determination.

[0157] In Example 37, the method of any one of Examples 21 to 36 further includes: modifying the DFI includes: when the first length of the DFI is less than the second length of the DCI format 0_2 frame structure, modifying the first length of the DFI by appending zeros to the DFI until the first length of the DFI is equal to the second length of the DCI format 0_2 frame structure.

[0158] In Example 38, the method of any one of Examples 21 to 37 further includes: modifying the DCI format 0_2 frame structure includes: when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, configuring the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by appending zero-padding bits at the tail end of the DCI format 0_2 frame structure.

[0159] In Example 39, the method of any one of Examples 21 to 38 further includes: modifying the DCI format 0_2 frame structure to include: when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, configuring the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more most significant bits (MSBs) of the bit mapping field in the DFI.

[0160] In Example 40, the method of any one of Examples 21 to 39 further includes: configuring the bit mapping field in the DFI by mapping hybrid automatic repeat request (HARQ) process indexes in ascending order from the MSB to the least significant bit (LSB) of the truncated bit mapping field.

[0161] In Example 41, the method of any one of Examples 21 to 40 further includes: configuring the bit mapping field in the DFI by the hybrid automatic repeat request (HARQ) process configured by mapping in ascending order from the MSB to the least significant bit (LSB) of the truncated bit mapping field.

[0162] In Example 42, the method of any one of Examples 21 to 41 further includes: determining whether the number of bits of the truncated bit mapping field is greater than the configured number of HARQ processes; and when the number of bits of the truncated bit mapping field is greater than the configured number of HARQ processes, configuring the remaining number of bits in the bit mapping field with zeros.

[0163] In Example 43, the method of any one of Examples 21 to 42 further includes: modifying the DCI format 0_2 frame structure to include: when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, configuring the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more least significant bits (LSBs) of the bit mapping field in the DFI.

[0164] In Example 44, the method of any one of Examples 21 to 43 further includes: configuring the bit mapping field in the DFI by mapping hybrid automatic repeat request (HARQ) process indexes in ascending order from the MSB to the least significant bit (LSB) of the truncated bit mapping field.

[0165] In Example 45, the method of any one of Examples 21 to 44 further includes: configuring the bit mapping field in the DFI by the hybrid automatic repeat request (HARQ) process configured by mapping in ascending order from the most significant bit (MSB) to the least significant bit (LSB) of the truncated bit mapping field.

[0166] In Example 46, the method of any of Examples 21 to 45 further includes: determining whether the number of bits of the truncated bit mapping field is greater than the configured number of HARQ processes; and when the number of bits of the truncated bit mapping field is greater than the configured number of HARQ processes, configuring the remaining bits in the bit mapping field with zeros.

[0167] In Example 47, the method of any of Examples 19 to 46 further includes: when the DCI indicates the DFI having the second predetermined DCI format, the DCI includes one or more of an uplink (UL) / downlink (DL) flag, a cross-carrier indicator field (CIF), a DFI flag, a hybrid automatic repeat request (HARQ) acknowledgement (HARQ-ACK) bit mapping, and a transmit power control (TPC) command.

[0168] Example 48 is an apparatus that includes one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause a system or device to implement the method of any of Examples 21 to 47.

[0169] Example 49 is a system or apparatus that includes means for implementing the method of any of Examples 21 to 47 or for implementing the apparatus of any of Examples 20 to 33.

[0170] Example 50 is a non-transitory computer-readable medium that stores instructions executable by one or more processors to cause the one or more processors to implement the method of any of Examples 21 to 47.

[0171] It should be understood that the specific order or hierarchy of the blocks in the disclosed processes / flowcharts is an illustration of exemplary approaches. It should be understood that based on design preferences, the specific order or hierarchy of the blocks in these processes / flowcharts can be rearranged. Additionally, some blocks may be combined or omitted. The appended method claims present the elements of the various blocks in an exemplary order and are not meant to be limited to the specific order or hierarchy presented.

[0172] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims, where the singular form of an element is not intended to mean "one and only one" unless specifically stated otherwise, but rather "one or more." The term "exemplary" as used herein means "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or superior to other aspects. Unless specifically stated otherwise, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "any combination of A, B, C, or thereof" include any combination of A, B, and / or C, and may include multiple A's, multiple B's, or multiple C's. Specifically, combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "any combination of A, B, C, or thereof" can be only A, only B, only C, A and B, A and C, B and C, or A and B and C, where any such combination can include one or more members of A, B, or C. Elements of the various aspects described throughout this disclosure that are presently known or later come to be known to those of ordinary skill in the art as all structural and functional equivalents are hereby expressly incorporated by reference and are intended to be covered by the claims. Additionally, nothing disclosed herein is intended to be dedicated to the public, whether or not such disclosure is expressly recited in the claims. The terms "module," "mechanism," "element," "device," etc. are not intended to be substitutes for the term "apparatus." Thus, no claim element should be construed as a means-plus-function unless the element is expressly recited using the phrase "means for...".

Claims

1. A method for wireless communication at a user equipment (UE), the method comprising: Receiving, at a first sub-band, downlink control information (DCI) having a first predetermined DCI format or a second predetermined DCI format from a base station, the second predetermined DCI format having a length less than that of the first predetermined DCI format, wherein the first predetermined DCI format includes a DCI format 0_1 frame structure, and the second predetermined DCI format includes a DCI format 0_2 frame structure; And When receiving the DCI having the second predetermined DCI format, determining that the DCI indicates downlink feedback information (DFI) based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI; wherein: The first sub-band includes a plurality of physical downlink control channels (PDCCHs) multiplexed in time or frequency, Receiving the DCI includes receiving a first PDCCH among the plurality of PDCCHs from the base station on the first sub-band, The first PDCCH includes the DFI and a cyclic redundancy check (CRC) attachment, At least a portion of the CRC attachment is encoded with the first predetermined scrambling code, and wherein the CRC attachment includes a first portion encoded with the first predetermined scrambling code and a second portion encoded with a second predetermined scrambling code, wherein the first predetermined scrambling code includes a configured scheduling radio network temporary identifier (CS-RNTI), and the second predetermined scrambling code includes a downlink feedback information radio network temporary identifier (DFI-RNTI), and wherein determining that the DCI indicates the DFI includes using the DFI-RNTI to decode at least the second portion of the CRC attachment.

2. The method according to claim 1, further comprising: Determining whether type 1 and / or type 2 configured grant (CG) physical uplink shared channels (PUSCHs) are configured; And When the type 1 and / or type 2 CG PUSCH is configured, using the indication in the DCI to determine whether the first PDCCH having the DCI format 0_2 frame structure indicates activation / deactivation of a CG transmission or the DFI.

3. The method according to claim 1, wherein the first predetermined scrambling code includes a modulation and coding scheme cell radio network temporary identifier (MCS-C-RNTI).

4. The method according to claim 3, further comprising: Determining whether type 1 and / or type 2 configured grant (CG) physical uplink shared channels (PUSCHs) are configured; And When the type 1 and / or type 2 CG PUSCH is configured, using the indication in the DCI to determine whether the first PDCCH having the DCI format 0_2 frame structure indicates an uplink scheduling grant or the DFI.

5. The method according to claim 1, wherein the first predetermined scrambling code includes a downlink feedback information radio network temporary identifier (DFI-RNTI).

6. The method according to claim 5, wherein determining that the DCI indicates the DFI includes using the DFI-RNTI to decode at least a part of the CRC-attached.

7. The method according to claim 1, wherein the DFI-RNTI in the second predetermined scrambling code has a first length, and the CS-RNTI in the first predetermined scrambling code has a second length greater than the first length.

8. The method according to claim 1, wherein the DFI has a first length corresponding to a second length of an uplink scheduling grant having a DCI format 0_2 frame structure.

9. The method according to claim 1, wherein: the indication in the DCI corresponds to a position in the DFI, and the indication in the DCI includes a DFI flag indicating a first value corresponding to activation / deactivation of a configured grant for CG transmission or uplink scheduling grant or a second value corresponding to a CG-DFI.

10. The method according to claim 1, wherein: the UE is configured to monitor the DCI having the first predetermined DCI format or the second predetermined DCI format, and the DFI is included in the DCI having the first predetermined DCI format or the second predetermined DCI format, the determining includes performing a blind decoding operation on the DCI with the first predetermined DCI format or the second predetermined DCI format to determine whether the DCI indicates the DFI.

11. The method according to claim 1, wherein: the UE is configured to monitor the DCI having the first predetermined DCI format or the second predetermined DCI format, the DFI is included in the DCI exclusively having the second predetermined DCI format, and the indication in the DCI indicating whether the DFI is included in the DCI is excluded from the DCI having the first predetermined DCI format.

12. An apparatus for wireless communication at a user equipment UE, comprising: a memory; and at least one processor coupled to the memory and configured to: perform the method according to any one of claims 1-11.

13. A computer-readable medium storing computer-executable program code for wireless communication at a user equipment, the program code causing the at least one processor to: perform the method according to any one of claims 1-11.

14. An apparatus for wireless communication at a user equipment UE, comprising: means for performing the method according to any one of claims 1-11.

15. A method for wireless communication at a base station, the method comprising: Generate DCI having a first predetermined downlink control information DCI format or a second predetermined DCI format, the second predetermined DCI format having a length less than that of the first predetermined DCI format, wherein the first predetermined DCI format includes a DCI format 0_1 frame structure, and the second predetermined DCI format includes a DCI format 0_2 frame structure; And When communicating the DCI having the second predetermined DCI format, communicate, on a first subband with a user equipment UE, the DCI indicating downlink feedback information DFI based on one or more of an indication in the DCI or a first predetermined scrambling code associated with the DCI, wherein: The first subband includes a plurality of physical downlink control channels PDCCH multiplexed in time or frequency, Communicating the DCI includes transmitting, on the first subband to the UE, a first PDCCH among the plurality of PDCCH, The first PDCCH includes the DFI and cyclic redundancy check CRC attachment, and wherein the CRC attachment includes a first part encoded with the first predetermined scrambling code and a second part encoded with a second predetermined scrambling code, wherein the first predetermined scrambling code includes a configured scheduling radio network temporary identifier CS-RNTI, and the second predetermined scrambling code includes a downlink feedback information radio network temporary identifier DFI-RNTI, wherein encoding at least a part of the CRC attachment includes using the DFI-RNTI to encode at least the second part of the CRC attachment.

16. The method according to claim 15, wherein generating the DCI includes: Encoding at least a part of the CRC attachment with the first predetermined scrambling code.

17. The method according to claim 16, wherein the first predetermined scrambling code includes a modulation and coding scheme cell radio network temporary identifier MCS-C-RNTI.

18. The method according to claim 16, wherein the first predetermined scrambling code includes a downlink feedback information radio network temporary identifier DFI-RNTI.

19. The method according to claim 18, wherein encoding at least a part of the CRC attachment includes encoding at least a part of the CRC attachment with the DFI-RNTI.

20. The method according to claim 15, wherein the DFI-RNTI in the second predetermined scrambling code has a first length, and the CS-RNTI in the first predetermined scrambling code has a second length greater than the first length.

21. The method according to claim 15, wherein: The indication in the DCI corresponds to a position in the DFI, and The indication in the DCI includes a DFI flag indicating a first value corresponding to activation / deactivation of a configured grant CG transmission or an uplink scheduling grant or a second value corresponding to a CG-DFI.

22. The method according to claim 15, wherein the DFI has a first length corresponding to a second length of an uplink scheduling grant having a DCI format 0_2 frame structure.

23. The method according to claim 15, wherein the DFI has a first length corresponding to a second length of the DCI format 0_2 frame structure.

24. The method according to claim 23, further comprising: determining whether the first length of the DFI is less than the second length of the DCI format 0_2 frame structure; and modifying the DFI or the DCI format 0_2 frame structure based on the determination.

25. The method according to claim 24, wherein modifying the DFI comprises: when the first length of the DFI is less than the second length of the DCI format 0_2 frame structure, modifying the first length of the DFI by appending zeros to the DFI until the first length of the DFI is equal to the second length of the DCI format 0_2 frame structure.

26. The method according to claim 24, wherein modifying the DCI format 0_2 frame structure comprises: when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, configuring the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by appending zero-padding bits at the end of the DCI format 0_2 frame structure.

27. The method according to claim 24, wherein modifying the DCI format 0_2 frame structure comprises: when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, configuring the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more most significant bits (MSBs) of the bit mapping field in the DFI.

28. The method according to claim 27, further comprising: configuring the bit mapping field in the DFI by mapping hybrid automatic repeat request (HARQ) process indices in ascending order from the MSB to the least significant bit (LSB) of the truncated bit mapping field.

29. The method according to claim 27, further comprising: configuring the bit mapping field in the DFI by the hybrid automatic repeat request (HARQ) process configured by mapping in ascending order from the MSB to the LSB of the truncated bit mapping field.

30. The method according to claim 29, further comprising: determining whether the number of bits of the truncated bit mapping field is greater than the number of configured HARQ processes; and when the number of bits of the truncated bit mapping field is greater than the number of configured HARQ processes, configuring the remaining number of bits in the bit mapping field with zeros.

31. The method according to claim 24, wherein modifying the DCI format 0_2 frame structure comprises: when the first length of the DFI is not less than the second length of the DCI format 0_2 frame structure, configuring the second length of the DCI format 0_2 frame structure to correspond to the first length of the DFI by truncating one or more least significant bits (LSBs) of the bit mapping field in the DFI.

32. The method according to claim 31, further comprising: configuring the bit mapping field in the DFI by mapping the hybrid automatic repeat request (HARQ) process index in ascending order from the most significant bit (MSB) to the least significant bit (LSB) of the truncated bit mapping field.

33. The method according to claim 31, further comprising: configuring the bit mapping field in the DFI by mapping the configured HARQ process in ascending order from the most significant bit (MSB) to the least significant bit (LSB) of the truncated bit mapping field.

34. The method according to claim 33, further comprising: determining whether the number of bits of the truncated bit mapping field is greater than the number of configured HARQ processes; and when the number of bits of the truncated bit mapping field is greater than the number of configured HARQ processes, configuring the remaining number of bits in the bit mapping field with zeros.

35. The method according to claim 15, wherein when the DCI indicates the DFI having the second predetermined DCI format, the DCI includes one or more of an uplink (UL) / downlink (DL) flag, a cross-carrier indicator field (CIF), a DFI flag, a hybrid automatic repeat request (HARQ) acknowledgement (HARQ-ACK) bit mapping, and a transmit power control (TPC) command.

36. An apparatus for wireless communication at a base station (BS), comprising: a memory; and at least one processor coupled to the memory and configured to: perform the method according to any one of claims 15 - 35.

37. A computer-readable medium storing computer-executable program code for wireless communication at a base station, the program code causing the at least one processor to: perform the method according to any one of claims 15 - 35 when executed by the at least one processor.

38. A device for wireless communication at a base station (BS), comprising: means for performing the method according to any one of claims 15 - 35.

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