Method and apparatus for configuring HARQ-ACK feedback

Abstract

The present disclosure describes methods, systems, and devices for configuring hybrid automatic repeat request acknowledgment (HARQ‑ACK) feedback for physical downlink shared channel (PDSCH) transmissions. The method includes: receiving, by a user equipment (UE), a radio resource control (RRC) parameter to configure a one-time HARQ‑ACK feedback mode; and receiving, by the UE, first downlink control information (DCI) including a first K, the first DCI corresponding to a first PDSCH. The method includes receiving, by the UE, a second DCI including a one-time request field having a second K with an available value and a positive value, the second DCI corresponding to a second PDSCH; and sending, by the UE according to a preset rule, a one-time HARQ‑ACK feedback.

Description

Technical Field

[0001] The present disclosure is generally directed to wireless communications. In particular, the present disclosure relates to methods and apparatus for configuring Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback. Background Art

[0002] Wireless communication technology is pushing the world into an increasingly interconnected and networked society. High-speed and low-latency wireless communications rely on efficient network resource management and allocation between user equipment and radio access network nodes (including but not limited to wireless base stations). The new generation of networks is expected to provide high-speed, low-latency and ultra-reliable communication capabilities and meet the needs of different industries and users. Ultra-reliable low-latency communication (URLLC) can provide communication with high reliability and low latency between user equipment and radio access network nodes. URLLC can be supported on licensed frequency carriers and / or unlicensed frequency carriers. There are some problems and difficulties associated with transmitting feedback information, for example, when the user equipment (UE) needs to configure hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback, how to improve the performance of transmitting feedback information. The present disclosure can solve at least some of the problems associated with existing systems to improve the performance of wireless communications. Summary of the invention

[0003] The present application relates to methods, systems and devices for wireless communications, and more particularly, to methods, systems and devices for configuring hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback.

[0004] In one embodiment, the present disclosure describes a method for wireless communication. The method includes configuring hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmission by the following process: receiving a radio resource control (RRC) parameter by a user equipment (UE) to configure a one-time HARQ-ACK feedback mode; receiving a first downlink control information (DCI) including a first K by the UE, the first DCI corresponding to a first PDSCH; receiving a second DCI by the UE, the second DCI including a one-time request field with a second K having an available value and a positive value, the second DCI corresponding to a second PDSCH; and sending a one-time HARQ-ACK feedback by the UE according to a preset rule.

[0005] In one embodiment, the present disclosure describes a method for wireless communication. The method includes configuring hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmission by the following process: a radio resource control (RRC) parameter is sent by a radio access network (RAN) to a user equipment (UE) to configure a one-time HARQ-ACK feedback mode; a first downlink control information (DCI) including a first K is sent by the RAN to the UE, and the first DCI corresponds to a first PDSCH; a second DCI is sent by the RAN to the UE, and the second DCI includes a one-time request field with a second K having an available value and a positive value, and the second DCI corresponds to a second PDSCH; and a one-time HARQ-ACK feedback is received by the RAN from the UE according to a preset rule.

[0006] In some other embodiments, an apparatus for wireless communication may include a memory storing instructions and a processing circuit in communication with the memory. When the processing circuit executes the instructions, the processing circuit is configured to perform the above method.

[0007] In some other embodiments, a device for wireless communication may include a memory storing instructions and a processing circuit in communication with the memory. When the processing circuit executes the instructions, the processing circuit is configured to perform the above method.

[0008] In some other embodiments, a computer-readable medium includes instructions that, when executed by a computer, cause the computer to perform the above method.

[0009] The above and other aspects and embodiments thereof are described in more detail in the drawings, the description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 An example of a wireless communication system is shown.

[0011] Figure 2 An example of a wireless network node is shown.

[0012] Figure 3 An example of a user device is shown.

[0013] Figure 4 A flow chart of a method for wireless communication is shown.

[0014] Figure 5A A schematic diagram of a method for wireless communication is shown.

[0015] Figure 5B A schematic diagram of a method for wireless communication is shown.

[0016] Figure 6A schematic diagram of a method for wireless communication is shown.

[0017] Figure 7 A schematic diagram of a method for wireless communication is shown.

[0018] Figure 8 A schematic diagram of a method for wireless communication is shown.

[0019] Fig. 9 A schematic diagram of a method for wireless communication is shown.

[0020] Fig. 10A A schematic diagram of a method for wireless communication is shown.

[0021] Fig. 10B A schematic diagram of a method for wireless communication is shown.

[0022] Fig.11 A schematic diagram of a method for wireless communication is shown.

[0023] Fig.12 A schematic diagram of a method for wireless communication is shown. DETAILED DESCRIPTION

[0024] The present disclosure will now be described in detail hereinafter with reference to the accompanying drawings, which form a part of the present disclosure and show by way of illustration specific examples of embodiments. It is noted, however, that the present disclosure may be embodied in a variety of different forms, and therefore, the subject matter covered or claimed is intended to be construed as not limited to any embodiment to be set forth below.

[0025] Throughout the specification and claims, terms may have subtle meanings indicated or implied by the context in addition to their explicitly stated meanings. Similarly, the phrases "in one embodiment" or "in some embodiments" as used herein do not necessarily refer to the same embodiment, and the phrases "in another embodiment" or "in other embodiments" as used herein do not necessarily refer to different embodiments. The phrases "in one implementation" or "in some embodiments" as used herein do not necessarily refer to the same implementation, and the phrases "in another implementation" or "in other embodiments" as used herein do not necessarily refer to different implementations. For example, the claimed subject matter is intended to include, in whole or in part, exemplary embodiments or combinations of implementations.

[0026] In general, terms can be understood at least in part from the use in the context. For example, terms such as "and", "or" or "and / or" as used herein can include various meanings, which can depend at least in part on the context in which such terms are used. Generally, if "or" is used for an association list such as A, B or C, it is intended to represent A, B and C used for inclusive meanings here, and A, B or C used for exclusive meanings here. In addition, the terms "one or more" or "at least one" used herein (depending at least in part on the context) can be used to describe any feature, structure or characteristic in a singular sense, or can be used to describe a combination of features, structures or characteristics in a plural sense. Similarly, terms such as "a", "an" or "the" can also be understood to convey singular usage or convey plural usage, which depends at least in part on the context. In addition, the term "based on" or "determined by..." can be understood as not necessarily intended to convey a set of exclusive factors, but on the contrary, additional factors that are not necessarily explicitly described can be allowed to exist, and similarly, this also depends at least in part on the context.

[0027] The present disclosure describes methods and apparatus for configuring Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback.

[0028] Next generation (NG) or fifth generation (5G) wireless communications can provide a range of capabilities from fast downloads to supporting real-time low-latency communications. Next generation (NG) mobile communication systems are moving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communications rely on effective network resource management and allocation between user equipment and radio access network nodes (including but not limited to radio base stations). The next generation network is expected to provide high-speed, low-latency and ultra-reliable communication capabilities and meet the needs of different industries and users. Ultra-reliable low-latency communication (URLLC) can provide high-reliability and low-latency communication between user equipment and radio access network nodes. In order to increase bandwidth, shorten latency and / or increase speed, wireless communications can be carried out on licensed bands and / or new radio unlicensed (NR-U) bands.

[0029] In a fifth generation (5G) communication system on a licensed frequency carrier, a URLLC service may configure one or more sub-timeslots within a time slot. Each of the one or more sub-timeslots may be configured to transmit feedback information to reduce latency in a URLLC service on a licensed carrier. In a fifth generation (5G) communication system on an NR-U frequency carrier, there is a problem in that the time required to transmit feedback information is increased, thereby increasing latency and deteriorating the performance of the communication system on the NR-U frequency carrier.

[0030] This disclosure describes various embodiments that address some of the issues discussed above.

[0031] Figure 1 A wireless communication system 100 is shown that includes a core network (CN) 110, a radio access network (RAN) 130, and one or more user equipment (UE) (152, 154, and 156). The RAN 130 may include a wireless network base station or a NG radio access network (NG-RAN) base station or node, which may include a nodeB (NB, such as a gNB) in a mobile telecommunication environment. In one embodiment, the core network 110 may include a 5G core network (5GC), and the interface 125 may include a new generation (NG) interface.

[0032] Reference Figure 1 , the first UE 152 may wirelessly receive downlink communications 142 from the RAN 130 and wirelessly send uplink communications 141 to the RAN 130. Similarly, the second UE 154 may wirelessly receive downlink communications 144 from the RAN 130 and wirelessly send uplink communications 143 to the RAN 130; and the third UE 156 may wirelessly receive downlink communications 146 from the RAN 130 and wirelessly send uplink communications 145 to the RAN 130. For example, but not limited to, the downlink communications may include a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and the uplink communications may include a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH). The downlink communications (142, 144 and / or 146) and / or the uplink communications (141, 143 and / or 145) may be transmitted on a licensed frequency carrier or an NR-U frequency carrier.

[0033] When URLLC operates on a licensed carrier, the UE may be configured with more than one HARQ-ACK codebook (e.g., but not limited to, pdsch-HARQ-ACK-Codebook-List-r16 and UCI-OnPUSCH-List-r16) through at least one radio resource control (RRC) parameter. When two HARQ-ACK codebooks are configured, parameters for these HARQ-ACK codebooks, such as candidate k1 sets, PUCCH resource sets, and UCI-OnPUSCH, may be configured separately. The transmission of the two HARQ-ACK codebooks may depend on different PUCCH / PUSCHs. When the transmission of the two codebooks occurs in the same time slot, the HARQ-ACK codebook for a lower priority (e.g., priority index = 0) may be discarded.

[0034] Using unlicensed carriers to transmit data can improve the utilization of available transmission resources, thereby improving URLLC performance. There are some challenges associated with URLLC working on unlicensed carriers. In low-latency wireless communications on unlicensed carriers, due to imperfect channel quality and fluctuations in communication resources, the transmitted wireless messages may be lost or damaged and cannot be corrected. For example, because channel access should be performed before data transmission, the device needs to perform a clear channel assessment (CCA) before data transmission and obtain a successful result. In some countries and regions, there are regulatory policies on the use of unlicensed spectrum. The device can perform a listen-before-talk (LBT) process (such as CCA) before sending data via an unlicensed carrier. For example, according to the channel access process, only devices with successful CCA can send data on an unlicensed carrier.

[0035] Another problem may arise when URLLC works on an unlicensed carrier. When a channel access failure occurs, the gNB / UE may not be able to send data, and the receiving end may not be able to receive the data correctly. These messages that were not received correctly may need to be retransmitted again, making the delay and reliability worse. Therefore, the proper design of the control mechanism for detecting and retransmitting lost or damaged messages can help improve the efficiency of the wireless access network, especially for accessing unlicensed shared wireless bands. In order to improve the efficiency of data transmission, the channel access process and control signaling need to be considered, and the communication system can support fast and reliable data transmission such as using unlicensed carriers to transmit URLLC uplink HARQ-ACK feedback.

[0036] For wireless transmissions in unlicensed carriers, a one-time HARQ-ACK feedback scheme can be used to provide multiple transmission opportunities for ACK / NACK feedback. When the UE configures the one-time feedback scheme and the one-time request bit field in the downlink control information (DCI) is 1, the UE can transmit a HARQ-ACK feedback codebook in the PUCCH / PUSCH containing all DL HARQ processes (one-time feedback) for all CCs configured for the UE in the PUCCH group. For DCI with format 1_1, at least one RRC parameter for one-time HARQ-ACK feedback includes pdsch-HARQ-ACK-OneShotFeedbackCBG-r16 and pdsch-HARQ-ACK-OneShotFeedbackNDI-r16, and is configured in the PhysicalCellGroupConfig IE, which may be UE-specific.

[0037] The present disclosure describes various embodiments for supporting URLLC transmissions on unlicensed bands and carriers and providing more transmission opportunities for HARQ-ACK feedback. Various embodiments include a one-time HARQ-ACK codebook mode supported for URLLC. The present disclosure addresses some challenges when URLLC supports one-time HARQ-ACK codebook feedback for unlicensed band operation, such as, but not limited to, how to combine two different features of these two requirements, and / or how to implement the compatibility of NR-U HARQ design and URLLC enhancement.

[0038] Figure 2 An exemplary radio access network or wireless communication base station 200 is shown. The base station 200 may include wireless transmit / receive (Tx / Rx) circuitry 208 to transmit / receive communications with one or more UEs and / or communications with one or more other base stations. The base station may also include network interface circuitry 209 to enable the base station to communicate with other base stations and / or a core network (e.g., optical or wired interconnects, Ethernet, and / or other data transmission media / protocols). The base station 200 may optionally include an input / output (I / O) interface 206 to communicate with an operator or the like.

[0039] The base station may also include system circuitry 204. System circuitry 204 may include one or more processors 221 and / or memory 222. Memory 222 may include an operating system 224, instructions 226, and parameters 228. Instructions 226 may be configured for one or more processors 124 to perform functions of the base station. Parameters 228 may include parameters that support the execution of instructions 226. For example, the parameters may include network protocol settings, bandwidth parameters, radio frequency mapping allocations, and / or other parameters.

[0040] Figure 3An exemplary user equipment (UE) 300 is shown. UE 300 may be a mobile device (e.g., a smartphone or a mobile communication module provided in a vehicle). UE 300 may include a communication interface 302, a system circuit 304, an input / output interface (I / O) 306, a display circuit 308, and a storage 309. The display circuit may include a user interface 310. System circuit 304 may include any combination of hardware, software, firmware, or other logic / circuits. System circuit 304 may be implemented, for example, with one or more systems on a chip (SoC), application specific integrated circuits (ASICs), discrete analog and digital circuits, and other circuits. System circuit 304 may be part of an implementation of any desired functionality in UE 300. In this regard, the system circuit 304 may include logic that facilitates, for example, decoding and playing music and video (e.g., MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback); running applications; accepting user input; saving and retrieving application data; establishing, maintaining, and terminating cellular phone calls or data connections for, for example, Internet connections; establishing, maintaining, and terminating wireless network connections, Bluetooth connections, or other connections; and displaying relevant information on the user interface 310. The user interface 310 and the input / output (I / O) interface 306 may include a graphical user interface, a touch-sensitive display, tactile feedback or other tactile output, voice or facial recognition input, buttons, switches, speakers, and other user interface elements. Additional examples of the I / O interface 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headphone and microphone input / output jacks, universal serial bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors), and other types of inputs.

[0041] Reference Figure 3, the communication interface 302 may include a radio frequency (RF) transmission (Tx) and reception (Rx) circuit 316, which processes the transmission and reception of signals through one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceiver may be a wireless transceiver, which includes a modulation / demodulation circuit, a digital-to-analog converter (DAC), a shaping table, an analog-to-digital converter (ADC), a filter, a waveform shaper, a filter, a preamplifier, a power amplifier and / or other logic for sending and receiving through one or more antennas or (for some devices) through a physical (e.g., wired) medium. The signals sent and received may follow any of a variety of arrays of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM), channels, code rates, and encodings. As a specific example, the communication interface 302 may include a transceiver that supports transmission and reception under 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS), High Speed ​​Packet Access (HSPA) +, 4G / Long Term Evolution (LTE), and 5G standards. However, the techniques described below are applicable to other wireless communication technologies, whether derived from the 3rd Generation Partnership Project (3GPP), the GSM Association, 3GPP2, IEEE, or other partners or standards bodies.

[0042] Reference Figure 3 , the system circuit 304 may include one or more processors 321 and a memory 322. The memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute the instructions 326 to perform the desired functions of the UE 300. The parameters 328 may provide and specify configuration and operating options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, or other data that the UE 300 will send or has received through the communication interface 302. In various embodiments, the system power for the UE 300 may be provided by a power storage device such as a battery or a transformer.

[0043] The present disclosure describes various embodiments of methods and apparatus for configuring hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmissions, which may be partially or fully described in the above Figure 2 and Figure 3 The invention is implemented on a wireless network base station and / or a user equipment described in the invention.

[0044] In one embodiment, referring to Figure 4, a method 400 for wireless communication includes configuring a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for a physical downlink shared channel (PDSCH) transmission. The method 400 may include some or all of the following steps: step 410, receiving a radio resource control (RRC) parameter by a user equipment (UE) to configure a one-time HARQ-ACK feedback mode; step 420, receiving a first downlink control information (DCI) including a first K by the UE, the first DCI corresponding to a first PDSCH; step 430, receiving a second DCI by the UE, the second DCI including a one-time request field having a second K with an available value and a positive value, the second DCI corresponding to a second PDSCH; and step 440, sending a one-time HARQ-ACK feedback by the UE according to a preset rule.

[0045] Referring to step 410, a base station (e.g., RAN) sends an RRC parameter to the UE to configure the UE in a one-shot HARQ-ACK feedback mode. In one embodiment, the RRC parameter may include a pdsch-HARQ-ACK-Codebook with a positive value of pdsch-HARQ-ACK-OneShotFeedback-r16 to configure the UE in a one-shot HARQ-ACK feedback mode. The value of pdsch-HARQ-ACK-OneShotFeedback-r16 may be 1.

[0046] Referring to step 420, the UE receives a first DCI corresponding to a first PDSCH. The first DCI includes a first K. K may be a PDSCH-to-HARQ_feedback timing indicator. In one embodiment, the first K of the first DCI may have a usable value. In another embodiment, the first K may have an unusable value.

[0047] The K of the DCI may be referred to as K1. When K (or K1) is a non-negative value, K (or K1) has a numerical value or a usable value. K (or K1) having a usable value may indicate the scheduling timing between the PDSCH and the corresponding PUCCH, so that the UE may send HARQ-ACK information for the PDSCH in the time slot in the PUCCH / PUSCH at K after the corresponding PDSCH. For example, there may be K1 number of time slots (or sub-time slots) between the PUCCH and the PDSCH.

[0048] When K (or K1) is a negative value, such as but not limited to -1, K (or K1) has a non-numeric value or an unusable value. K (or K1) having an unusable value may indicate to the UE that the UE should store the HARQ-ACK feedback for the PDSCH.

[0049] Referring to step 430, the UE receives a second DCI corresponding to a second PDSCH. The second DCI includes a one-time request field having a second K that can be used and a positive value. In one embodiment, the one-time request field having a positive value includes a one-time request field having a value of 1.

[0050] Referring to step 440, according to a preset rule, the UE may send a one-time HARQ-ACK feedback to the base station.

[0051] In one embodiment, the UE combines the first HARQ-ACK feedback of the first PDSCH in the one-time HARQ-ACK codebook with the second HARQ-ACK feedback of the second PDSCH. The UE sends the one-time HARQ-ACK codebook in the time slot at the second K after the second PDSCH. In one embodiment, the first DCI and the second DCI can schedule PDSCHs with the same priority index. In another embodiment, the first DCI and the second DCI can schedule PDSCHs with different priority indexes.

[0052] DCI may have several formats, such as but not limited to DCI format 1_0, DCI format 1_1, and DCI format 1_2. The present disclosure may be applicable to at least one DCI format or all DCI formats.

[0053] In one embodiment, for a one-time HARQ-ACK codebook, different RRC parameters for one-time HARQ-ACK feedback may be configured for different priority indicators. The RRC parameters may include pdsch-HARQ-ACK-OneShotFeedbackCBG-r16 and pdsch-HARQ-ACK-OneShotFeedbackNDI-r16, which may be different for different priority indicators. For example, for priority indicator = 0, pdsch-HARQ-ACK-OneShotFeedbackCBG-r16 may be enabled or disabled; and for priority indicator = 1, pdsch-HARQ-ACK-OneShotFeedbackCBG-r16 may be enabled or disabled. Similarly, for priority indicator = 0, pdsch-HARQ-ACK-OneShotFeedbackNDI-r16 may be enabled or disabled; and for priority indicator = 1, pdsch-HARQ-ACK-OneShotFeedbackNDI-r16 may be enabled or disabled.

[0054] In another embodiment, a one-time HARQ-ACK request bit field is added to DCI format 1_2. When the one-time HARQ-ACK request bit field is 1, the one-time HARQ-ACK feedback is triggered; when the one-time HARQ-ACK request bit field is 0, the one-time HARQ-ACK feedback is not triggered. If the one-time HARQ-ACK codebook is triggered, the UE sends the one-time HARQ-ACK codebook.

[0055] Reference Figure 5A For DCI format 1_2, the first DCI (DCI-1, 510) for the first PDSCH (PDSCH-1, 518) may have a PDSCH-to-HARQ_feedback timing indicator bit field (K1-1) with an unusable value (or non-numeric value, or NNK1, or -1). This -1 value may be configured to the UE by the RAN via the RRC parameter of dl-DataToUL-ACK. When the value of the PDSCH-to-HARQ_feedback timing indicator is -1, it tells the UE that the UE should store the HARQ-ACK information for this PDSCH.

[0056] In one example, the UE receives PDSCH-1 518 scheduled by DCI-1 510, which is detected by the UE in the first PDCCH monitoring opportunity and includes K1-1 from NNK1 of dl-DataToUL-ACK. The UE stores the HARQ-ACK information of PDSCH-1. When the UE detects the second DCI (DCI-2, 520) of the second PDSCH (PDSCH-2, 528). DCI-2 520 may include one bit of a one-time HARQ-ACK request field with a value of 1, and one bit of a PDSCH-to-HARQ_feedback timing indicator field with a usable value (e.g., K1-2=2). The UE may multiplex the corresponding HARQ-ACK information 518 of PDSCH-1 in PUCCH or PUSCH transmission in the time slot indicated by the value of the PDSCH-to-HARQ_feedback timing indicator field in the second DCI.

[0057] For reference Figure 5AAs an example, in time slot n, the UE receives PDSCH-1 518 corresponding to DCI-1 510, which includes K1-1=NNK1, priority index (PI)=1, and group index (GI)=1. In time slot n+1, the UE receives PDSCH-2 528 corresponding to DCI-2 520, which includes a one-time HARQ-ACK request field with a value of 1 and K1-2=2. The HARQ-ACK feedback for PDSCH-1 is combined with the HARQ-ACK feedback for PDSCH-2 and transmitted in time slot n+3 according to the K1-2 value in DCI-2, and the ACK / NACK is included in the one-time HARQ-ACK codebook 570. In another embodiment, DCI-1 510 may include PI=0 or GI=0. In another embodiment, the PI of the first DCI may be different from the PI of the second DCI, and / or the GI of the first DCI may be different from the GI of the second DCI. In another embodiment, the first DCI and / or the second DCI may not include a GI and / or PI value. In another embodiment, when the DCI does not include a GI, the GI may have a default value of 0; and / or when the DCI does not include a PI, the PI may have a default value of 0.

[0058] In another embodiment, the first K of the first DCI may also include an available value. Figure 5B As an example, the first DCI (DCI-1, 510b) may include a usable value K (e.g., K1-1=2). Upon receiving the second DCI that triggers the one-time HARQ-ACK feedback, the UE combines the HARQ-ACK feedback for PDSCH-1 in the one-time HARQ-ACK codebook 570 with the HARQ-ACK feedback for PDSCH-2, and sends the one-time HARQ-ACK codebook 570 in time slot n+3 according to the K1-2 value in DCI-2.

[0059] In another embodiment, when the first DCI and the second DCI schedule PDSCHs with the same priority index, the UE merges the first HARQ-ACK feedback for the first PDSCH in the one-time HARQ-ACK codebook with the second HARQ-ACK feedback for the second PDSCH; and when the first DCI and the second DCI schedule PDSCHs with different priority indexes, the UE postpones sending the first HARQ-ACK feedback for the first PDSCH until the UE receives another DCI with a one-time request field having a usable value of K and a positive value, and schedules the PDSCH with the same priority index as the first DCI.

[0060] For reference Figure 6 As an example, in time slot n, the UE receives PDSCH-1 618 corresponding to DCI-1 610, which includes K1-1=NNK1, PI-1=1, and GI=1. In time slot n+1, the UE receives PDSCH-2 628 corresponding to DCI-2 620, which includes a one-time HARQ-ACK request field with a value of 1, PI-2=1, and K1-2=2. Since the first DCI and the second DCI schedule PDSCHs with the same priority index, the HARQ-ACK feedback for PDSCH-1 is combined with the HARQ-ACK feedback for PDSCH-2 and transmitted in time slot n+3 according to the K1-2 value in DCI2, and this ACK / NACK is included in the one-time HARQ-ACK codebook 670. In another embodiment, DCI-1 510 may include GI=0, which may be the same as or different from the GI of DCI-2. In another embodiment, PI-1 may be 0, and PI-2 may be 0. In another embodiment, the GI of the first DCI may be the same as or different from the GI of the second DCI. In another embodiment, the first DCI and / or the second DCI may not include a GI and / or PI value, which may have a default value of 0.

[0061] For reference Figure 7As another example, in time slot n, the UE receives PDSCH-1 718 corresponding to DCI-1 710, which includes K1-1=NNK1, PI-1=0, and GI=1. In time slot n+1, the UE receives PDSCH-2 728 corresponding to DCI-2 720, which includes a one-time HARQ-ACK request field with a value of 1, PI-2=1, and K1-2=2. Since the first DCI and the second DCI schedule PDSCHs with different priority indexes, the HARQ-ACK feedback for PDSCH-1 is not combined with the HARQ-ACK feedback for PDSCH-2; and according to the K1-2 value in DCI2, the HARQ-ACK feedback for PDSCH-1 is not transmitted in time slot n+3. This ACK / NACK for PDSCH-1 is not included in the one-time HARQ-ACK codebook 770. When the UE receives another DCI including K having a usable value, a one-time request field having a positive value, and a scheduled PDSCH having the same priority index as the first DCI, the UE may send a first HARQ-ACK feedback for the first PDSCH 718 at a later time. In another embodiment, DCI-1 510 may include GI=0, which may be the same as or different from the GI of DCI-2. In another embodiment, PI-1 may be 1, and PI-2 may be 0. In another embodiment, the first DCI and / or the second DCI may not include a GI and / or PI value, which may indicate a default value of 0.

[0062] In one embodiment, the UE only reports the ACK / NACK information of the HARQ process of the PDSCH with the same priority index as the priority index of the DCI with the same HARQ process ID it received last time. Figure 6 , the UE may report a one-time HARQ-ACK codebook including ACK / NACK for all HARQ processes sending PDSCHs with the same PI=1; and refer to Figure 7 , the HARQ-ACK of other HARQ processes used to send a PDSCH with a PI different from the PI indicated in the DCI is not reported in the one-time HARQ-ACK codebook.

[0063] In another embodiment, referring to Figure 6 , when the value of the priority indicator in the DCI scheduling the PDSCH is the same as the value of the priority indicator of the DCI triggering the one-time HARQ-ACK codebook, the HARQ-ACK of this HARQ process ID may be included in the one-time HARQ-ACK codebook; and referring to Figure 7, when the value of the priority indicator in the DCI scheduling the PDSCH is different from the priority indicator of the DCI triggering the one-time HARQ-ACK codebook, the HARQ-ACK of this HARQ process ID may not be included in the one-time HARQ-ACK codebook.

[0064] In another embodiment, the UE may send different one-time HARQ-ACK codebooks corresponding to different priority indexes. When the first DCI and the second DCI schedule a PDSCH with the same priority index, the UE merges the first HARQ-ACK feedback for the first PDSCH in the first one-time HARQ-ACK codebook with the second HARQ-ACK feedback for the second PDSCH, and the UE sends the first one-time HARQ-ACK codebook in the first sub-time slot or the first time slot. When the first DCI and the second DCI schedule PDSCHs with different priority indexes, the UE merges the second HARQ-ACK feedback for the second PDSCH in the first one-time HARQ-ACK codebook; the UE merges the first HARQ-ACK feedback for the first PDSCH in the second one-time HARQ-ACK codebook, and the UE sends the second one-time HARQ-ACK codebook in the second sub-time slot or the second time slot.

[0065] The UE may be configured with one-shot HARQ-ACK feedback enabled by pdsch-HARQ-ACK-OneShotFeedback-r16. The UE may receive a DCI including a one-shot HARQ-ACK request bit field with a value of 1. For example, the DCI may have a DCI format 1_1 or a DCI format 1_2. The DCI may have a usable value of K (e.g., k1=2). After receiving the DCI, the UE may report ACK / NACK for all configured HARQ processes of the configured PDSCH.

[0066] In one embodiment, HARQ-ACK codebooks for different priority indexes may be transmitted on different PUCCH / PUSCH. In this case, the value of K as the PDSCH-to-HARQ_feedback timing indicator is used for HARQ-ACK codebook transmission of the priority index in the DCI, and the PDSCH-to-HARQ_feedback timing and PUCCH resources of other HARQ-ACK codebooks for other priority indexes may be determined by one of the following methods.

[0067] For one method, the time slot / subslot in which the second HARQ-ACK codebook for other priority indexes is sent is the nearest available UL time slot / subslot, such as the subslot immediately adjacent to the first HARQ-ACK codebook. The PUCCH resource indicator (PRI) of the PUCCH transmission carrying this HARQ-ACK codebook can be the same as that indicated in the one-time HARQ-ACK codebook triggered by the DCI.

[0068] For reference Figure 8 As an example, in time slot / sub-time slot n, the UE receives PDSCH-1 818 corresponding to DCI-1 810, which includes K1-1=NNK1, PI-1=1. In time slot / sub-time slot n+1, the UE receives PDSCH-2 828 corresponding to DCI-2 820, which includes a one-time HARQ-ACK request field with a value of 1, PI-2=1 and K1-2=2. After receiving the second DCI triggering the one-time request in sub-time slot n+1, the UE combines the first HARQ-ACK feedback for the first PDSCH in the one-time HARQ-ACK codebook for PI=1 with the second HARQ-ACK feedback for the second PDSCH, and sends the one-time HARQ-ACK codebook 870 for PI=1 in sub-time slot 1 on the PUCCH resources indicated in the second DCI. The UE may also combine HARQ-ACK feedback for other PDSCHs with PI=0 (or no PI but default PI is 0) into a one-time HARQ-ACK codebook for PI=0, and send the one-time HARQ-ACK codebook for PI=0 in subslot 2.

[0069] For reference Fig. 9As another example, in slot / subslot n, the UE receives PDSCH-1 918 corresponding to DCI-1 910, which includes K1-1=NNK1, PI-1=1. In slot / subslot n+1, the UE receives PDSCH-2 928 corresponding to DCI-2 920, which includes a one-time HARQ-ACK request field with a value of 1, PI-2=0 and K1-2=2. After receiving the second DCI triggering the one-time request in subslot n+1, the UE merges the first HARQ-ACK feedback for the first PDSCH in the one-time HARQ-ACK codebook for PI=1, and sends the one-time HARQ-ACK codebook 870 for PI=1 in subslot 1 on the PUCCH resources indicated in the second DCI. The UE may also incorporate the second HARQ-ACK feedback for the second PDSCH into a one-time HARQ-ACK codebook for PI=0, and send the one-time HARQ-ACK codebook for PI=0 in subslot 2. In another embodiment, DCI-2 may not include a PI-2 value, and the default PI value is 0.

[0070] This embodiment may include a method for determining a time slot / subslot for sending a one-time HARQ-ACK codebook for PI=0. In one embodiment, when the subslot adjacent to subslot 1 is available, subslot 2 may be a subslot adjacent to subslot 1, i.e., subslot 1 and subslot 2 are adjacent to each other. In another embodiment, when the subslot adjacent to subslot 1 is not available, such as when the SFI indicates that the subslot is used for DL ​​transmission, the UE may send a one-time HARQ-ACK codebook for PI=0 in the next available subslot.

[0071] For another method, the DCI may include a second K value and / or a PRI to determine a time slot / sub-time slot in which a second one-time HARQ-ACK codebook for other priority indexes is transmitted.

[0072] In one embodiment, the second K value may determine the time slot or sub-time slot of the second one-shot HARQ-ACK codebook, wherein the second K value is indicated by the DCI. Fig. 10AAs an example, in slot / subslot n, the UE receives PDSCH-1 1018 corresponding to DCI-1 1010, which includes K1-1=NNK1, PI-1=1. In slot / subslot n+1, the UE receives PDSCH-2 1028 corresponding to DCI-2 1020, which includes a one-time HARQ-ACK request field with a value of 1, PI-2=1, and two K values, namely K1-2=1 and K1-2=3. After receiving the second DCI triggering the one-time request in subslot n+1, the UE combines the first HARQ-ACK feedback for the first PDSCH in the one-time HARQ-ACK codebook for PI=1 with the second HARQ-ACK feedback for the second PDSCH, and sends the one-time HARQ-ACK codebook 1070 for PI=1 in subslot 1 on the PUCCH resource indicated in the second DCI. The UE may also combine HARQ-ACK feedback for other PDSCHs with PI=0 (or no PI but the default PI is 0) in the one-time HARQ-ACK codebook for PI=0, and send the one-time HARQ-ACK codebook for PI=0 in subslot n+4.

[0073] In another embodiment, the second K may determine the time slot or sub-time slot of the second one-shot HARQ-ACK codebook, which is the time slot relative to the time slot of the first one-shot HARQ-ACK codebook. Fig. 10B , because the second K1-2 in DCI-2 1020 is 3, the UE can send a one-time HARQ-ACK codebook (1080) for PI=0 in subslot n+5, which is 3 subslots away from the subslot used to send a one-time HARQ-ACK codebook (1070) for PI=1.

[0074] In another embodiment, the DCI may include two K1 values ​​and two PRI values ​​for different HARQ-ACK codebooks with different priority indexes. Fig. 10A and / or Fig. 10B The DCI-2 in may include a one-time HARQ-ACK request field with a value of 1, PI-2=1, and two sets {K1-2=1 and PRI=1}; and {K1-2=3 and PRI=3}. The UE may send a first one-time HARQ-ACK codebook in a time slot where K1-2=1 after the second PDSCH and corresponds to the first PRI=1; and the UE may send a second one-time HARQ-ACK codebook in a time slot where K1-2=3 after the second PDSCH and corresponds to the second PRI=3.

[0075] The embodiment may include a method for determining whether a one-time HARQ-ACK codebook for PI=1 is sent before a one-time HARQ-ACK codebook for PI=0. In one embodiment, by default, the one-time HARQ-ACK codebook for PI=1 is sent before the one-time HARQ-ACK codebook for PI=0. This may be because the transmission corresponding to PI=1 has a higher priority than the transmission corresponding to PI=0, thereby making the one-time HARQ-ACK codebook for PI=1 have a higher priority than the one-time HARQ-ACK codebook for PI=0. In another embodiment, the determination may depend on the PI value of the DCI including a one-time HARQ-ACK request field with a value of 1, for example Figure 8 When PI-2 of DCI-2 is 1, the one-time HARQ-ACK codebook for PI=1 is sent before the one-time HARQ-ACK codebook for PI=0; when PI-2 of DCI-2 is 0, the one-time HARQ-ACK codebook for PI=0 is sent before the one-time HARQ-ACK codebook for PI=1.

[0076] In another embodiment, the UE may send a single one-time HARQ-ACK codebook including two sub-codebooks corresponding to different priority indexes. The UE may report ACK / NACK for all HARQ processes of the PDSCH of all configured carriers configured for the UE in the same HARQ-ACK codebook, and the HARQ-ACK codebooks for different priority indicators in the PUCCH group may be transmitted on the same PUCCH / PUSCH. The one-time HARQ-ACK codebook may include two sub-codebooks, which are constructed for different priorities respectively. This embodiment includes various implementations for determining the order of the HARQ-ACK bits in the HARQ-ACK codebook.

[0077] In one implementation, the first subcodebook is determined according to the scheduling priority indicated in the DCI that triggers the one-time HARQ-ACK feedback, and the second subcodebook may include HARQ-ACKs of other priorities.

[0078] In another embodiment, the first sub-codebook is determined according to the scheduling priority index 1, and the second sub-codebook may correspond to the scheduling priority index 0.

[0079] In another embodiment, the first sub-codebook is determined according to the scheduling priority index 0, and the second sub-codebook may correspond to the scheduling priority index 1.

[0080] For reference Fig.11 As an example, in time slot / sub-time slot n, the UE receives PDSCH-1 1118 corresponding to DCI-1 1110, which includes K1-1=NNK1, PI-1=1. In time slot / sub-time slot n+1, the UE receives PDSCH-2 1128 corresponding to DCI-2 1120, which includes a one-time HARQ-ACK request field with a value of 1, PI-2=1 and K1-2=2. After receiving the second DCI triggering the one-time request in sub-time slot n+1, the UE combines the first HARQ-ACK feedback for the first PDSCH in the one-time HARQ-ACK subcodebook 1170 for PI=1 with the second HARQ-ACK feedback for the second PDSCH. The UE may also combine HARQ-ACK feedback for other PDSCHs with PI=0 (or no PI but default PI is 0) in a one-time HARQ-ACK subcodebook for PI=0. The UE may send a one-time HARQ-ACK codebook 1190 in subslot n+3 on the PUCCH resource as indicated in the second DCI. The one-time HARQ-ACK codebook 1190 includes a subcodebook (1170) for PI=1 and a subcodebook (1180) for PI=0.

[0081] For reference Fig.12 As another example, in slot / subslot n, the UE receives PDSCH-1 1218 corresponding to DCI-1 1210, which includes K1-1=NNK1, PI-1=1. In slot / subslot n+1, the UE receives PDSCH-2 1228 corresponding to DCI-2 1220, which includes a one-time HARQ-ACK request field with a value of 1, PI-2=0 and K1-2=2. After receiving the second DCI triggering the one-time request in subslot n+1, the UE merges the first HARQ-ACK feedback for the first PDSCH in the one-time HARQ-ACK subcodebook 1270 for PI=1. The UE can merge the second HARQ-ACK feedback for the second PDSCH in the one-time HARQ-ACK subcodebook for PI=0. The UE may send a one-time HARQ-ACK codebook 1290 in subslot n+3 on the PUCCH resource as indicated in the second DCI. The one-time HARQ-ACK codebook 1290 includes a subcodebook with PI=1 (1270) and a subcodebook with PI=0 (1280).

[0082] In another embodiment, each sub-codebook may be constructed separately according to separately configured RRC parameters. For example, harq-Codebook 1 for PI=0 may be configured to enable pdsch-HARQ-ACK-OneShotFeedbackCBG-r16 and pdsch-HARQ-ACK-OneShotFeedbackNDI-r16, and / or harq-Codebook 2 for PI=1 may be configured to disable pdsch-HARQ-ACK-OneShotFeedbackCBG-r16 and pdsch-HARQ-ACK-OneShotFeedbackNDI-r16. In one embodiment, when the HARQ process number is the same, the sub-codebook for PI=0 may have a larger size than the sub-codebook for PI=1.

[0083] In another embodiment, the sequence of HARQ-ACK bits for PDSCH in the one-time HARQ-ACK codebook may be determined based on the carrier index. For each carrier, the order of the HARQ-ACK bits may be based on the HARQ process ID of the UE configured for the carrier.

[0084] The present disclosure describes methods, apparatus, and computer-readable media for wireless communications. The present disclosure addresses the problem of configuring hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmissions. The methods, devices, and computer-readable media described in the present disclosure can facilitate the performance of wireless communications by configuring HARQ-ACK feedback for PDSCH transmissions, thereby improving efficiency and overall performance. The methods, devices, and computer-readable media described in the present disclosure can improve the overall efficiency of wireless communication systems.

[0085] References to features, advantages, or similar language throughout this specification do not imply that all features and advantages that may be achieved with the present solution should be present or included in any single embodiment thereof. Rather, language referring to features and advantages is understood to mean that a particular feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussion of features and advantages and similar language throughout this specification may, but does not necessarily, refer to the same embodiment.

[0086] In addition, the described features, advantages, and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. Based on the description herein, one of ordinary skill in the relevant art will recognize that the present solution may be practiced without one or more specific features or advantages of a particular embodiment. In other cases, additional features and advantages that may not be present in all embodiments of the present solution may be recognized in certain embodiments.

Claims

1. A method for wireless communication, comprising: The Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback for Physical Downlink Shared Channel (PDSCH) transmission is configured by the following procedure: Receiving, by a user equipment (UE), a radio resource control (RRC) parameter to configure a one-shot HARQ-ACK feedback mode; Receiving, by the UE, first downlink control information (DCI) including a first scheduling timing value, the first DCI corresponding to a first PDSCH; Receiving, by the UE, a second DCI, the second DCI including a one-time request field having a second scheduling timing value of an available value and a positive value, the second DCI corresponding to a second PDSCH; as well as The UE sends a one-time HARQ-ACK feedback according to a preset rule, wherein: In response to the first DCI and the second DCI scheduling a PDSCH having the same priority index, the UE combines a first HARQ-ACK feedback for the first PDSCH with a second HARQ-ACK feedback for the second PDSCH in a one-time HARQ-ACK codebook, In response to the first DCI and the second DCI scheduling PDSCHs with different priority indexes, the UE postpones sending the first HARQ-ACK feedback for the first PDSCH until the UE receives another DCI with a one-time request field with an available scheduling timing value and a positive value, and schedules the PDSCH with the same priority index as the first DCI.

2. The method according to claim 1, wherein: The UE sends the one-time HARQ-ACK codebook in a time slot at the second scheduling timing value after the second PDSCH.

3. The method of claim 1 , wherein the one-time HARQ-ACK codebook comprises a first one-time HARQ-ACK codebook, and wherein: In response to the first DCI and the second DCI scheduling a PDSCH having the same priority index: The UE further sends the first one-time HARQ-ACK codebook in a first sub-time slot or a first time slot; as well as In response to the first DCI and the second DCI scheduling PDSCHs with different priority indexes: The UE combines the second HARQ-ACK feedback for the second PDSCH into a first one-time HARQ-ACK codebook; The UE combines the first HARQ-ACK feedback for the first PDSCH into a second one-time HARQ-ACK codebook, and The UE sends the second one-time HARQ-ACK codebook in a second subslot or a second slot.

4. The method according to claim 3, wherein: The first sub-slot and the second sub-slot are immediately adjacent to each other.

5. The method according to claim 4, wherein: The first sub-slot and the second sub-slot are in a slot at a second scheduled timing value after the second PDSCH.

6. The method according to claim 4, wherein: The first sub-timeslot precedes the second sub-timeslot.

7. The method according to claim 4, wherein: In response to the second DCI including the priority index 1, the first sub-timeslot precedes the second sub-timeslot; and In response to the first DCI including the priority index 0, the second subslot precedes the first subslot.

8. The method according to claim 3, wherein: The second DCI includes a third scheduling timing value of a usable value; The first sub-time slot is in a time slot at the second scheduled timing value after the second PDSCH; as well as The second sub-time slot is in a time slot at the third scheduled timing value after the second PDSCH.

9. The method according to claim 3, wherein: The second DCI includes the second scheduling timing value and a first PRI corresponding to the second scheduling timing value, and a third scheduling timing value of a usable value and a second PRI corresponding to the third scheduling timing value; The first sub-time slot is in a time slot at the second scheduled timing value after the second PDSCH and corresponds to the first PRI; and The second sub-time slot is in a time slot at the third scheduled timing value after the second PDSCH and corresponds to the second PRI.

10. The method according to any one of claims 8-9, wherein: The third scheduled timing value comprises at least one of: an offset of the second scheduled timing value, or an offset of the first sub-time slot.

11. The method according to claim 9, wherein: The first sub-timeslot precedes the second sub-timeslot.

12. The method according to claim 9, wherein: In response to the second DCI including the priority index 1, the first sub-timeslot precedes the second sub-timeslot; and In response to the first DCI including the priority index 0, the second subslot precedes the first subslot.

13. The method of claim 1, wherein: The first HARQ-ACK feedback for the first PDSCH is in a first subcodebook; and In response to the first DCI and the second DCI scheduling PDSCHs with different priority indexes: The UE combines the first HARQ-ACK feedback into the first subcodebook in the one-time HARQ-ACK codebook, and The UE combines the second HARQ-ACK feedback into the first subcodebook in the one-time HARQ-ACK codebook.

14. The method according to claim 13, wherein: The first subcodebook precedes the second subcodebook; and The first subcodebook includes HARQ-ACK feedback corresponding to a DCI including a priority index having a value of 1.

15. The method of claim 13, wherein: The first subcodebook precedes the second subcodebook; and The first subcodebook includes HARQ-ACK feedback corresponding to a DCI including a priority index having a value of 0.

16. The method of claim 13, wherein: The UE combines, according to separately configured RRC parameters, the first HARQ-ACK feedback in the first subcodebook with the second HARQ-ACK feedback for the second PDSCH.

17. A method for wireless communication, comprising: The Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback for Physical Downlink Shared Channel (PDSCH) transmission is configured by the following procedure: A radio resource control (RRC) parameter is sent by a radio access network (RAN) to a user equipment (UE) to configure a one-shot HARQ-ACK feedback mode; Sending, by the RAN, first downlink control information (DCI) including a first scheduling timing value to the UE, the first DCI corresponding to a first PDSCH; The RAN sends a second DCI to the UE, where the second DCI includes a one-time request field having a second scheduling timing value that is a usable value and a positive value, and the second DCI corresponds to a second PDSCH; as well as The RAN receives a one-time HARQ-ACK feedback from the UE according to a preset rule, wherein: In response to the first DCI and the second DCI scheduling a PDSCH having the same priority index, a first HARQ-ACK feedback for the first PDSCH and a second HARQ-ACK feedback for the second PDSCH in a one-time HARQ-ACK codebook are combined, In response to the first DCI and the second DCI scheduling PDSCHs with different priority indexes, the UE postpones sending the first HARQ-ACK feedback for the first PDSCH until the UE receives another DCI with a one-time request field with an available scheduling timing value and a positive value, and schedules the PDSCH with the same priority index as the first DCI.

18. A wireless communication device, comprising a processor and a memory, wherein: The processor is configured to read code from the memory and implement the method according to any one of claims 1 to 17.

19. A computer program product comprising computer readable program medium code stored thereon, which, when executed by a processor, causes the processor to implement the method according to any one of claims 1 to 17.

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