Wireless communication method, device and equipment

Abstract

The invention discloses a wireless communication method, device and equipment, and belongs to the field of communication, and the wireless communication method comprises the steps that first equipment receives first data from second equipment; and the first device executes receiving feedback for the first data by using a target feedback mode, wherein the target feedback mode comprises one of the following modes: layer 2 feedback, one feedback mode selected from layer 1 feedback and layer 2 feedback, layer 1 feedback and layer 2 feedback.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a wireless communication method, apparatus, and device. Background Technology

[0002] In New Radio (NR) systems, the Media Access Control (MAC) layer and the Radio Link Control (RLC) layer can provide data transmission feedback and retransmission mechanisms. The MAC layer has a Hybrid Automatic Repeat Request (HARQ) function. HARQ feedback can be provided through layer 1 (L1) for HARQ processes (e.g., by sending HARQ feedback via the Physical Uplink Control Channel (PUCCH) through L1). When the feedback is a HARQ Negative Acknowledgement (NACK), the HARQ process is retransmitted, further improving transmission reliability. In RLC Acknowledged Mode (AM), reception status feedback (such as RLC Automatic Repeat reQuest (ARQ) status reports) can be provided based on the receiver's (e.g., feedback receiver's) reception detection mechanism or the transmitter's (e.g., feedback transmitter's) polling mechanism. For Radio Link Control Protocol Data Units (RLC PDUs) or RLC PDU segments that show NACK in the status feedback, the RLC transmitter can initiate retransmission, further improving transmission reliability. Additionally, to simultaneously improve transmission reliability and latency performance (e.g., reducing transmission latency), a Packet Data Convergence Protocol (PDCP) duplication mechanism is introduced. Each PDCP PDU is duplicated, resulting in two or more data packets that are transmitted through two or more different paths, consuming twice or more resources to ensure the reliability and latency performance of critical data. However, the PDCP replication transmission mechanism consumes a lot of resources and is expensive.

[0003] Specifically, MAC layer feedback can be understood as L1 feedback, and false detections are possible. For example, a HARQ acknowledgement (ACK) might be mistakenly detected as a HARQ negative acknowledgement (NACK), or a HARQ NACK might be mistaken as a HARQ ACK, thus affecting transmission results and reliability. RLC layer feedback and retransmission triggering mechanisms are complex and affected by timer settings and transmission scheduling, resulting in delays of, for example, tens of milliseconds. The PDCP duplication mechanism also incurs significant resource overhead.

[0004] Therefore, how to improve the feedback performance of data transmission is a problem that needs to be solved. Summary of the Invention

[0005] This application provides a wireless communication method, apparatus, and device that can solve the problem of poor feedback performance in data transmission.

[0006] Firstly, a wireless communication method is provided, comprising:

[0007] The first device receives the first data from the second device;

[0008] The first device uses a target feedback method to perform the receiving feedback for the first data;

[0009] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0010] Secondly, a wireless communication method is provided, including:

[0011] The second device sends the first data to the first device;

[0012] The second device receives from the first device the reception feedback for the first data executed by the first device using the target feedback method;

[0013] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0014] Thirdly, a wireless communication device is provided, comprising:

[0015] A receiving module is used to receive first data from a second device;

[0016] The sending module is used to perform receiving feedback for the first data using the target feedback method;

[0017] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0018] Fourthly, a wireless communication device is provided, comprising:

[0019] The sending module is used to send first data to the first device;

[0020] The receiving module is configured to receive receiving feedback from the first device regarding the first data, which is executed by the first device using a target feedback method.

[0021] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0022] Fifthly, a wireless communication device is provided, the device being configured to perform the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0023] In a sixth aspect, a first device is provided, the first device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0024] In a seventh aspect, a first device is provided, including a processor and a communication interface;

[0025] The communication interface is used to receive first data from the second device;

[0026] The communication interface is also used to perform reception feedback for the first data using a target feedback method;

[0027] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0028] In an eighth aspect, a second device is provided, the second device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the second aspect.

[0029] In a ninth aspect, a second device is provided, including a processor and a communication interface;

[0030] The communication interface is used to send first data to the first device;

[0031] The communication interface is also used to receive reception feedback for the first data executed by the first device using the target feedback method;

[0032] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0033] In a tenth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0034] Eleventhly, a wireless communication system is provided, comprising: a first device and a second device, wherein the first device is configured to perform the steps of the method as described in the first aspect, and the second device is configured to perform the steps of the method as described in the second aspect.

[0035] In a twelfth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0036] In a thirteenth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor to implement the steps of the wireless communication method as described in the first aspect, or to implement the steps of the wireless communication method as described in the second aspect.

[0037] In this embodiment, a first device receives first data from a second device. The first device performs reception feedback on the first data using a target feedback method. The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 and layer 2 feedback, or layer 1 and layer 2 feedback. In this embodiment, layer 2 feedback has advantages such as high reliability, low latency, and low block error rate. Specifically, using layer 2 feedback to perform reception feedback on the first data can improve the reliability of the reception feedback and reduce the latency. Alternatively, the first device can use a feedback method selected from layer 1 and layer 2 feedback to perform reception feedback on the first data. The first device can choose a suitable feedback method from layer 1 and layer 2 feedback based on actual needs, increasing the flexibility in the implementation of the reception feedback and improving the feedback performance. Alternatively, the first device can use both layer 1 and layer 2 feedback to perform reception feedback on the first data. By comprehensively considering the results of layer 1 and layer 2 feedback, the reliability of the reception feedback can be improved. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a communication system architecture provided in an embodiment of this application.

[0039] Figure 2 This is a schematic diagram of a user plane protocol stack provided in this application.

[0040] Figure 3 This is a schematic diagram of an uplink L2 architecture provided in this application.

[0041] Figure 4 This is a schematic flowchart of a wireless communication method provided according to an embodiment of this application.

[0042] Figure 5 This is a schematic diagram of a layer 2 feedback provided according to an embodiment of this application.

[0043] Figure 6 This is a schematic diagram illustrating the use of Layer 2 feedback in data retransmission according to an embodiment of this application.

[0044] Figure 7 This is a schematic diagram of an uplink transmission according to an embodiment of this application.

[0045] Figure 8 This is a schematic block diagram of a wireless communication device provided according to an embodiment of this application.

[0046] Figure 9 This is a schematic block diagram of another wireless communication device provided according to an embodiment of this application.

[0047] Figure 10 This is a schematic block diagram of a communication device provided according to an embodiment of this application.

[0048] Figure 11 This is a schematic diagram of the hardware structure of a terminal according to an embodiment of this application.

[0049] Figure 12 This is a schematic block diagram of a network-side device provided according to an embodiment of this application. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0051] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0052] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as one in which the sender explicitly informs the receiver of specific information, the operation to be performed, or the requested result, etc., in the instruction sent. An indirect instruction can be understood as one in which the receiver determines the corresponding information based on the instruction sent by the sender, or makes a judgment and determines the operation to be performed or the requested result, etc., based on the judgment result.

[0053] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0054] Figure 1 This diagram illustrates a block diagram of a wireless communication system applicable to embodiments of this application. Specifically, the wireless communication system includes a terminal 11 and a network-side device 12.

[0055] Terminal 11 can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home device (home device with wireless communication function, such as refrigerator, television, washing machine or furniture, etc.), game console, personal computer (PC), ATM or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart earphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in the embodiments of this application.

[0056] Among them, network-side equipment 12 may include access network equipment or core network equipment.

[0057] Alternatively, access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, wireless local area network (WLAN) access points (APs), or wireless Fidelity (WiFi) nodes, etc. The term "base station" can be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NRNode B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), or any other suitable term in the relevant field, as long as the same technical effect is achieved. The term "base station" is not limited to specific technical terms. It should be noted that this application embodiment only uses a base station in an NR system as an example for description and does not limit the specific type of base station.

[0058] Optionally, core network equipment may also be referred to as core network nodes, core network functions, or core network elements, and includes, but is not limited to, at least one of the following: Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), and Local NEF. The core network equipment (NEF, or L-NEF) includes the following functions: Binding Support Function (BSF), Application Function (AF), Location Management Function (LMF), Gateway Mobile Location Centre (GMLC), and Network Data Analytics Function (NWDAF). It should be noted that this application only uses core network equipment in the NR system as an example and does not limit the specific type of core network equipment. If the name of the core network equipment mentioned in this application changes in subsequent protocol versions (e.g., 6G), it will still be within the scope of protection of this application.

[0059] Optionally, the core network equipment can be implemented by one or more functional modules in a single device, or by multiple devices working together; this application does not specifically limit this. It is understood that the aforementioned functional modules can be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (e.g., a cloud platform).

[0060] To better understand the technical solution of this application, the data processing of the user plane related to this application is explained.

[0061] In NR systems, such as Figure 2 As shown, the user plane protocol stack mainly includes: Media Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), Service Data Adaptation Protocol (SDAP), and physical layer (PHY).

[0062] like Figure 2As shown, apart from PHY, which is a layer 1 (L1) protocol stack, the other four layers constitute a layer 2 (L2) protocol stack: the MAC layer, RLC layer, PDCP layer, and SDAP layer. The MAC layer is primarily responsible for: mapping between logical channels and transport channels, logical channel priority handling, multiplexing and demultiplexing of Media Access Control Service Data Units (MAC SDUs), scheduling, and Hybrid Automatic Repeat reQuest (HARQ) operations. The RLC layer provides the following functions: data transmission, segmentation and reassembly, Automatic Repeat reQuest (ARQ), and independent sequence numbers in three modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). The PDCP layer provides header compression and decompression, secure operation, separate bearer routing, and replication functions. The SDAP layer provides services such as mapping Quality of Service (QoS) flows to radio bearers and marking uplink and downlink packets with QoS flow identifiers (QoS flow IDs, QFIs).

[0063] For example, the uplink L2 architecture can be as follows: Figure 3 As shown.

[0064] Generally, both the MAC layer and the RLC layer can provide data transmission feedback and retransmission mechanisms. The MAC layer has HARQ functionality, and HARQ feedback can be provided through L1 (e.g., sending a PUCCH via L1 for HARQ process feedback). When the feedback is HARQ NACK, the HARQ process is retransmitted, further improving transmission reliability. MAC layer feedback can be understood as L1 feedback. Additionally, in RLC AM mode, reception status feedback (e.g., RLC ARQ status report) can be provided based on the receiver's (e.g., feedback receiver's) receive detection mechanism or the sender's (e.g., feedback sender's) polling mechanism. For NACK RLC PDUs or RLC PDU segments in the status feedback, the RLC sender can initiate retransmission, further improving transmission reliability.

[0065] On the other hand, to simultaneously improve transmission reliability and latency performance (such as reducing transmission latency), a PDCP duplication mechanism was introduced. This involves replicating each PDCP PDU to obtain two or more data packets, which are then transmitted through two or more different paths. This consumes twice or more resources to ensure the reliability and latency performance of critical data. However, the PDCP duplication mechanism is very resource-intensive and expensive.

[0066] Specifically, the MAC layer has HARQ Feedback and Retransmission mechanisms, and the RLC AM mode also has ARQ Status Report and Retransmission functions. However, while the MAC layer's feedback and retransmission are rapid, false detections can occur, such as a HARQ ACK being mistaken for a HARQ NACK, or vice versa, thus affecting transmission results and reliability. On the other hand, while the RLC layer's feedback and retransmission are highly reliable, their triggering mechanisms are complex and subject to timer settings and transmission scheduling, resulting in delays of, for example, tens of milliseconds.

[0067] For services with high reliability and high latency requirements, such as those with a latency of at least 10 ms... -6 The block error rate is low, and the transmission latency is required to be less than 10ms-20ms. For such services, it is not easy to achieve this by simply using the traditional HARQ and ARQ combination. If the PDCP duplication mechanism is enabled, there will be high resource consumption and cost.

[0068] The wireless communication method provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0069] Figure 4 This is a schematic flowchart of a wireless communication method 200 according to an embodiment of this application, such as... Figure 4 As shown, the wireless communication method 200 may include at least some of the following:

[0070] S210, the second device sends the first data to the first device;

[0071] S220, the first device receives the first data from the second device;

[0072] S230, the first device performs reception feedback for the first data using a target feedback method;

[0073] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback;

[0074] S240, the second device receives from the first device the reception feedback for the first data executed by the first device using the target feedback method.

[0075] It should be understood that Figure 4 The steps or operations of the wireless communication method 200 are illustrated, but these steps or operations are merely examples, and other operations may be performed in this application. Figure 4 Variations of various operations within it.

[0076] In some embodiments, the Layer 2 feedback includes, but is not limited to, feedback for the HARQ process implemented based on the Media Access Control Control Element (MAC CE).

[0077] In some embodiments, the Layer 1 feedback includes, but is not limited to, at least one of the following: feedback based on the Physical Uplink Control Channel (PUCCH) and feedback based on the Physical Sidelink Control Channel (PSCCH).

[0078] In this embodiment, Layer 2 feedback offers advantages such as high reliability, low latency, and low block error rate. Specifically, Layer 2 feedback can be timely feedback sent via MAC CE to a HARQ process, or it can be timely feedback sent via MAC CE to a MAC PDU. The association between the MAC CE's transmission location and the data transmission location reported by the MAC CE can be dynamically indicated by scheduling signaling or semi-statically configured via RRC signaling. Furthermore, since MAC CEs can carry CRC checksums and perform encoding modulation and link adaptive transmission, the reliability of Layer 2 feedback is significantly improved compared to PUCCH or Layer 1 feedback. Because Layer 2 feedback is provided immediately after the MAC PDU is sent, with a processing latency of only a few milliseconds, it offers superior performance in terms of latency characteristics compared to the tens or even hundreds of milliseconds of latency in RLC feedback.

[0079] Specifically, the first device can use Layer 2 feedback to perform the reception feedback of the first data, which can improve the reliability of the reception feedback and reduce the latency of the first data reception feedback. Alternatively, the first device can use a feedback method selected from Layer 1 feedback and Layer 2 feedback to perform the reception feedback of the first data. The first device can choose a suitable feedback method from Layer 1 feedback and Layer 2 feedback based on actual needs, which increases the flexibility in the implementation of the first data reception feedback and can also improve the feedback performance of the first data. Or, the first device can use both Layer 1 feedback and Layer 2 feedback to perform the reception feedback of the first data. By comprehensively considering the results of Layer 1 feedback and Layer 2 feedback, the reliability of the first data reception feedback can be improved.

[0080] In some embodiments, the first device may be a terminal and the second device may be a network-side device; or, the first device may be a network-side device and the second device may be a terminal; or, the first device may be a first terminal and the second device may be a second terminal.

[0081] This application introduces two feedback mechanisms for HARQ feedback: L1 feedback (such as PUCCH-based or PSCCH-based feedback) and L2 feedback (such as feedback for HARQ processes implemented based on MAC CE). When scheduling feedback for HARQ processes implemented based on MAC CE, the network-side device provides the association between the MAC CE feedback and the corresponding MAC layer transmission; or, when configuring feedback for HARQ processes implemented based on MAC CE through semi-static signaling, the network-side device provides the association between the MAC CE feedback and the corresponding MAC layer transmission. For example, the time-domain and / or frequency-domain relationship between the MAC CE feedback and the corresponding MAC layer transmission. In this application embodiment, feedback for HARQ processes implemented based on MAC CE may also have a HARQ process ID, and has a HARQ feedback mechanism and / or a HARQ retransmission mechanism.

[0082] In the embodiments of this application, layer 1 feedback (such as feedback based on PUCCH or feedback based on PSCCH) and / or layer 2 feedback (such as feedback for the HARQ process based on MAC CE) can be configured as needed.

[0083] For example, when Layer 2 feedback is configured, the first device uses Layer 2 feedback to perform reception feedback for the first data, which can improve the reliability of the reception feedback of the first data and reduce the latency of the reception feedback of the first data. This ensures both the processing complexity of the receiving end and the sending end and improves the efficiency of the overall system resources. On the basis of ensuring system efficiency, it further improves the user experience and service quality.

[0084] For example, when both Layer 1 feedback and Layer 2 feedback are configured, the first device uses one of the feedback methods selected from Layer 1 feedback and Layer 2 feedback to perform the reception feedback for the first data. The first device can select a suitable feedback method from Layer 1 feedback and Layer 2 feedback based on actual needs, which increases the flexibility in the implementation of the reception feedback of the first data and can also improve the feedback performance of the first data. This ensures both the processing complexity of the receiving end and the sending end and improves the efficiency of the overall system resources. On the basis of ensuring system efficiency, it further improves the user experience and service quality.

[0085] For example, when both Layer 1 feedback and Layer 2 feedback are configured, the first device uses Layer 1 feedback and Layer 2 feedback to perform reception feedback for the first data. By comprehensively considering the results of Layer 1 feedback and Layer 2 feedback, the reliability of reception feedback for the first data can be improved. This not only ensures the processing complexity of the receiving and sending ends but also improves the efficiency of overall system resources. On the basis of ensuring system efficiency, it further improves user experience and service quality.

[0086] It should be noted that since Layer 1 feedback and Layer 2 feedback are generally configured on different frequency domain resources and / or time domain resources, it is not impossible for both Layer 1 and Layer 2 feedback to be enabled simultaneously for a particular transmission or retransmission. For the first device, feedback is performed according to the feedback method indicated by the second device. If both Layer 1 and Layer 2 feedback are enabled simultaneously, feedback is performed once at the resource location designated for Layer 1 feedback, and then again at the resource location designated for Layer 2 feedback. Thus, for the second device, the results of both Layer 1 and Layer 2 feedback are considered together to form the final feedback result. For example, when the CRC check of Layer 2 feedback is correct, the Layer 2 feedback takes precedence; only when the CRC check of Layer 2 feedback fails is the feedback result of Layer 1 feedback considered separately.

[0087] The receiving end described in this application embodiment can be a receiving end for feedback information, and the sending end described in this application embodiment can be a sending end for feedback information.

[0088] For example, taking the first device as the terminal, the second device as the network-side device, and the first data as downlink data, when the terminal is configured with a Layer 2 feedback mechanism for downlink data, after receiving the first data, the terminal will send a reception feedback for the first data at the Layer 2 feedback location indicated by the network side, based on whether the first data was decoded correctly. Correspondingly, the network side decides whether to retransmit the first data based on the reception feedback. In the network, if some terminals are configured to use a Layer 2 feedback mechanism for downlink data transmission, and others are configured to use a Layer 1 feedback mechanism, the terminals can operate independently according to their respective configurations, and the network-side device and the terminal communicate and provide feedback according to the configuration and instructions.

[0089] In some embodiments, the wireless communication method 200 further includes:

[0090] The first device receives first configuration information from the second device;

[0091] The first configuration information includes the relevant configurations fed back by layer 2;

[0092] The relevant configurations for the feedback of layer 2 include, but are not limited to, at least one of the following:

[0093] The applicable objects of the feedback from layer 2;

[0094] The feedback parameters of layer 2;

[0095] The modulation and coding scheme of the layer 2 feedback;

[0096] The Cyclic Redundancy Check (CRC) information fed back by Layer 2;

[0097] The repeated information fed back by layer 2;

[0098] The HARQ feedback information fed back by layer 2;

[0099] The HARQ retransmission information fed back by layer 2.

[0100] In this embodiment, the first device can receive relevant configurations from the second device regarding Layer 2 feedback, thereby obtaining at least one of the following: the applicable object of Layer 2 feedback, the feedback parameters of Layer 2 feedback, the modulation and coding scheme of Layer 2 feedback, the CRC information of Layer 2 feedback, the duplication information of Layer 2 feedback, the HARQ feedback information of Layer 2 feedback, and the HARQ retransmission information of Layer 2 feedback. Thus, the first device can execute Layer 2 feedback based on the relevant configurations of Layer 2 feedback.

[0101] For example, taking the first device as the terminal and the second device as the network-side device, for a UE with Layer 2 feedback capability, the network-side device can comprehensively decide to configure the Layer 2 feedback mechanism for the UE based on factors such as the UE's capabilities, the UE's service information, the current network status information, and the algorithm information on the base station side. Among these factors, since Layer 2 feedback has a significant advantage over Layer 1 feedback in that it has higher feedback overhead and higher reliability, Layer 2 feedback can be prioritized for services that have high requirements for indicators such as block error rate, reliability, and latency. In terms of network conditions, Layer 2 feedback can be more easily supported when the network load is generally light.

[0102] In some embodiments, the first configuration information may also include the relevant configurations fed back by layer 1, but this application embodiment does not limit this.

[0103] In some embodiments, the applicable objects of the layer 2 feedback include, but are not limited to, at least one of the following:

[0104] All services of the first device, uplink services of the first device, downlink services of the first device, sideline services of the first device, specific services of the first device, and specific MAC CE of the first device.

[0105] For example, the Layer 2 feedback configuration is a per-UE configuration. In this case, the Layer 2 feedback applies to all services of the first device (e.g., a terminal). For instance, once the Layer 2 feedback configuration is configured, all services of the first device (e.g., a terminal) will perform Layer 2 feedback; conversely (i.e., if the Layer 2 feedback configuration is not configured), all services of the first device (e.g., a terminal) will not support Layer 2 feedback. In this case, HARQ feedback uses the Layer 1 feedback method.

[0106] For example, downlink services support Layer 2 feedback, while uplink services do not; or, downlink services support Layer 2 feedback, side-link services support Layer 2 feedback, while uplink services do not; or, side-link services support Layer 2 feedback, while neither uplink nor downlink services support Layer 2 feedback; or, downlink services support Layer 2 feedback, while neither uplink nor side-link services support Layer 2 feedback; or, downlink services support Layer 2 feedback, uplink services support Layer 2 feedback, and side-link services support Layer 2 feedback; or, downlink services do not support Layer 2 feedback, neither uplink nor side-link services support Layer 2 feedback. For services that do not support Layer 2 feedback, Layer 1 feedback is used.

[0107] In some embodiments, the specific business includes, but is not limited to, at least one of the following:

[0108] Downlink signaling radio bearers (SRB), downlink data radio bearers (DRB) (e.g., DRB 2), downlink MAC CE, sideline SRB, sideline DRB, sideline MAC CE.

[0109] Specifically, specific business processes use Layer 2 feedback, while other business processes use Layer 1 feedback.

[0110] In some embodiments, the specific MAC CE includes, but is not limited to, at least one of the following:

[0111] MAC CE carrying a copy transmission activation indication, MAC CE carrying a copy transmission deactivation indication, MAC CE carrying a secondary cell (SCell) activation indication, MAC CE carrying a SCell deactivation indication, and MAC CE carrying a discontinuous reception (DRX) command.

[0112] Specifically, certain MAC CEs use layer 2 feedback, while other MAC CEs use layer 1 feedback.

[0113] In some embodiments, the feedback parameters of the layer 2 feedback include, but are not limited to, at least one of the following: the size of the feedback resource, the feedback content, the modulation and coding scheme, the number of CRC bits, the time domain offset, and the frequency domain offset;

[0114] The feedback content includes one of the following:

[0115] NACK or ACK, NACK only, ACK only;

[0116] Wherein, the time-domain offset is the offset between the time-domain position of the data fed back by layer 2 and the time-domain position of the data fed back by layer 2;

[0117] Wherein, the frequency domain offset is the offset between the frequency domain position of the feedback from layer 2 and the frequency domain position of the data fed back by layer 2.

[0118] It should be noted that since MAC CE has higher detectability than PUCCH, it can simply provide ACK-only or NACK-only feedback. Specifically, Layer 2 feedback (such as ACK) is sent only when the reception is correct, or Layer 2 feedback (such as NACK) is sent only when the reception is incorrect. In this way, the receiving side can determine whether Layer 2 feedback exists by detecting the received level, and thus determine whether it is ACK or NACK. At the same time, for example, NACK-only means that there is only a very small probability, about 10%, of sending feedback, so the interference of feedback resources to other transmissions can be reduced, further improving the detection success rate.

[0119] In this embodiment, configuring the feedback parameters of Layer 2 feedback can further reduce the overhead of Layer 2 feedback. If the feedback parameters of Layer 2 feedback can be configured semi-statically using RRC professional signaling, the overhead of dynamically indicating the feedback parameters of Layer 2 feedback can be eliminated. Optionally, some parameters of Layer 2 feedback are indicated in the semi-static configuration, while a small number of parameters are dynamically indicated (e.g., dynamically indicated in the Physical Downlink Control Channel (PDCCH) of the scheduling downlink Media Access Control Protocol Data Unit (MAC PDU). For example, the feedback parameters of Layer 2 feedback can dynamically carry the time domain offset. The position of n slots or n symbols after the end of the downlink MAC PDU or PDCCH is the time domain position of Layer 2 feedback, and the value of n is dynamically carried by the PDCCH. This allows for more flexible coordination of the reserved time domain resource positions of Layer 2 feedback between different devices, improving resource utilization efficiency.

[0120] In this embodiment, compared to Layer 1 feedback, Layer 2 feedback is more like a MAC packet. The modulation and coding scheme of Layer 2 feedback can be adjusted (e.g., based on link quality). Layer 2 feedback can carry CRC checksums and even perform retransmissions. Layer 2 feedback can also perform HARQ feedback and HARQ retransmission. For example, retransmission can be enabled in the PDCCH or RRC signaling, repeating the transmission three times; or, the use of HARQ feedback and / or HARQ retransmission mechanisms can be indicated in the PDCCH or RRC signaling. Since Layer 2 feedback for downlink data is itself an uplink MAC transmission, if the HARQ retransmission mechanism is enabled, the network side schedules the retransmission resources of the HARQ process to repeat the Layer 2 feedback itself, further improving the reliability of Layer 2 feedback. This achieves fast and accurate feedback on data transmission, improving data transmission reliability and latency performance.

[0121] In this embodiment, since the layer 2 feedback can have CRC verification, if the CRC verification fails when the feedback content of the layer 2 feedback is ACK or NACK, it can be considered that an ACK->NACK or NACK->ACK error has occurred, so it can be corrected directly.

[0122] Specifically, prior to S210, the first device receives the first configuration information from the second device. For example, in this embodiment, the first device is a terminal and the second device is a network-side device; or, the first device is a first terminal and the second device is a second terminal.

[0123] In some embodiments, the first device is a terminal, the second device is a network-side device, and the first configuration information can be carried through at least one of the following:

[0124] Radio Resource Control (RRC) signaling, Downlink Control Information (DCI), and Downlink MAC CE.

[0125] In some embodiments, the first device is a first terminal, the second device is a second terminal, and the first configuration information can be carried by at least one of the following:

[0126] PC5 message, Sidelink Control Information (SCI), Sidelink MAC CE.

[0127] Optionally, the first device is a first terminal, the second device is a second terminal, and the first device may also receive the first configuration information from a network-side device.

[0128] In some embodiments, the wireless communication method 200 further includes:

[0129] The first device receives first information from the second device;

[0130] The first information is used to indicate the target feedback method.

[0131] In this embodiment, the first device can determine the target feedback method based on the first information received from the second device, so that the first device can use the target feedback method to perform the receiving feedback for the first data.

[0132] For example, when the data transmission of the first device supports both Layer 1 feedback mechanism and Layer 2 feedback mechanism, the first device receives the first information from the second device.

[0133] Specifically, prior to S210, the first device receives the first information from the second device. For example, in this embodiment, the first device is a terminal and the second device is a network-side device; or, the first device is a first terminal and the second device is a second terminal; or, the first device is a network-side device and the second device is a terminal.

[0134] Optionally, the first device is a terminal, the second device is a network-side device, and the first information can be carried by at least one of the following: RRC signaling, DCI, downlink MAC CE.

[0135] Optionally, the first device is a network-side device, the second device is a terminal, and the first information can be carried by at least one of the following: RRC signaling, UCI, uplink MAC CE.

[0136] Optionally, the first device is a first terminal, the second device is a second terminal, and the first information can be carried by at least one of the following: PC5 message, SCI, side-by-side MAC CE.

[0137] Optionally, the first device is a first terminal, the second device is a second terminal, and the first device may also receive the first information from a network-side device.

[0138] For example, taking the first device as the terminal and the second device as the network-side device, the network side explicitly carries the feedback method for this transmission in the downlink signaling, such as PDCCH, such as either Layer 2 feedback or Layer 1 feedback. After receiving the data, the terminal will provide feedback according to the feedback method indicated by the network side.

[0139] In some embodiments, the wireless communication method 200 further includes:

[0140] The first device determines the target feedback method based on the agreed-upon information.

[0141] In this embodiment, the first device determines the target feedback method based on the protocol agreement information, so that the first device can use the target feedback method to perform the receiving feedback for the first data.

[0142] For example, when the data transmission of the first device supports both Layer 1 and Layer 2 feedback mechanisms, the first device determines the target feedback method based on the protocol agreement information.

[0143] Specifically, prior to S210 above, the first device determines the target feedback method based on the agreed-upon information.

[0144] In some embodiments, the target feedback method is determined based on at least one of the following: the type of the first data, the composition of the first data, the priority of the first data, the transmission delay requirement of the first data, the transmission error rate requirement of the first data, the transmission reliability requirement of the first data, and the network load.

[0145] In this embodiment, the target feedback method can be determined based on at least one of the following: the type of the first data, the composition of the first data, the priority of the first data, the transmission delay requirement of the first data, the transmission error rate requirement of the first data, the transmission reliability requirement of the first data, and the network load. This can improve the accuracy of the feedback received from the first data.

[0146] For example, taking the first device as the terminal and the second device as the network-side device, the target feedback method can be determined according to the network-side configuration or the method agreed upon in the protocol. For example, SRB 1 adopts Layer 2 feedback, all downlink MAC CEs or some important downlink MAC CEs with high latency and reliability requirements adopt Layer 2 feedback, some data with high latency and reliability requirements adopt Layer 2 feedback, DRB 1 adopts Layer 2 feedback, etc.

[0147] In some embodiments, the first information is associated with at least one of the following, or the first information is determined based on at least one of the following: the type of the first data, the composition of the first data, the priority of the first data, the transmission delay requirement of the first data, the transmission block error rate requirement of the first data, the transmission reliability requirement of the first data, and the network load.

[0148] In some embodiments, the protocol agreement information is associated with at least one of the following, or the protocol agreement information is determined based on at least one of the following: the type of the first data, the composition of the first data, the priority of the first data, the transmission delay requirement of the first data, the transmission block error rate requirement of the first data, the transmission reliability requirement of the first data, and the network load.

[0149] In some embodiments, the first data is a MAC PDU;

[0150] If the MAC PDU includes any type of data that requires feedback from Layer 2, the target feedback method includes Layer 2 feedback, or the target feedback method includes both Layer 1 feedback and Layer 2 feedback; or, if the MAC PDU does not include data that requires feedback from Layer 2, the target feedback method is Layer 1 feedback; and / or,

[0151] If the highest priority data in the MAC PDU corresponds to the layer 2 feedback, the target feedback method includes the layer 2 feedback; or, the target feedback method includes both layer 1 feedback and layer 2 feedback. Alternatively, if the highest priority data in the MAC PDU corresponds to the layer 1 feedback, the target feedback method includes the layer 1 feedback.

[0152] For example, taking the first device as the terminal and the second device as the network-side device, for downlink data, since the network side organizes the data transmission, it ultimately determines the feedback method adopted by the MAC PDU based on the data type and composition, and explicitly instructs the terminal accordingly. For instance, if the MAC PDU contains any data requiring MAC CE feedback, the entire MAC PDU adopts the MAC CE feedback method; conversely, if the MAC PDU does not contain data requiring MAC CE feedback, the entire MAC PDU adopts the PUCCH feedback method. Alternatively, the feedback method for the entire MAC PDU can be directly determined based on the feedback type corresponding to the highest priority data in the MAC PDU.

[0153] In some embodiments, the wireless communication method 200 further includes:

[0154] The first device receives the second information from the second device;

[0155] Wherein, the second information is used to indicate that the current transmission or retransmission of the first data uses the feedback of layer 1 or the feedback of layer 2, or the second information is used to indicate that the kth retransmission of the first data uses the feedback of layer 1 or the feedback of layer 2, or the second information is used to indicate the feedback method used for the subsequent s retransmissions of the first data.

[0156] Where k and s are both positive integers.

[0157] In this embodiment, the first device can know, based on the second information, that the current transmission or retransmission of the first data uses layer 1 feedback or layer 2 feedback; or, the first device can know, based on the second information, that the kth retransmission of the first data uses layer 1 feedback or layer 2 feedback; or, the first device can know, based on the second information, the feedback method used for the subsequent s retransmissions of the first data, thereby enabling the first device to perform reception feedback for the first data.

[0158] Specifically, prior to S210, the first device receives the second information from the second device. For example, in this embodiment, the first device is a terminal and the second device is a network-side device; or, the first device is a first terminal and the second device is a second terminal; or, the first device is a network-side device and the second device is a terminal.

[0159] In some embodiments, if the feedback method corresponding to the initial transmission of the first data is Layer 1 feedback, the feedback method corresponding to the retransmission of the first data is Layer 2 feedback. Specifically, retransmissions only occur when the link quality is poor. For subsequent retransmissions, Layer 2 feedback can be explicitly indicated, or Layer 2 feedback can be used by default, to improve the accuracy of the feedback and avoid NACK being mistakenly detected as ACK, causing packet loss and transmission failure.

[0160] In some embodiments, if the feedback method corresponding to the initial transmission of the first data and the feedback method corresponding to at least one retransmission of the first data are both Layer 1 feedback, then the feedback method corresponding to retransmissions after the at least one retransmission of the first data are all Layer 2 feedback. Specifically, multiple retransmissions only occur when the link quality is poor. Therefore, for subsequent retransmissions, Layer 2 feedback can be explicitly indicated, or Layer 2 feedback can be used by default, to improve the accuracy of the feedback and avoid NACK being mistakenly detected as ACK, causing packet loss and transmission failure.

[0161] In some embodiments, for the initial transmission of the first data, the feedback method corresponding to the initial transmission of the first data is determined to be Layer 1 feedback based on the business situation. If the first data fails to be transmitted multiple times, it is determined that the link is poor, and the subsequent feedback is switched to Layer 2 to improve the feedback accuracy.

[0162] In some embodiments, the wireless communication method 200 further includes:

[0163] If the feedback method has changed, and there are unfinished HARQ processes, the first device executes the receiving feedback corresponding to the unfinished HARQ process according to the feedback method before the change, until the unfinished HARQ process ends; and / or, if the feedback method has changed, and there are unfinished HARQ processes, after the unfinished HARQ process ends, the first device executes the receiving feedback corresponding to the subsequent HARQ process according to the feedback method after the change.

[0164] In this embodiment, if there are unfinished HARQ processes when the feedback method changes, the timing of the change in the feedback method taking effect can be determined.

[0165] In some embodiments, the wireless communication method 200 further includes:

[0166] If the feedback parameters have changed, and there are unfinished HARQ processes, the first device determines, based on the changed feedback parameters, to execute the receiving feedback corresponding to the unfinished HARQ process according to the feedback parameters before the change; or, the first device determines, based on the changed feedback parameters, to execute the receiving feedback corresponding to the unfinished HARQ process according to the feedback parameters after the change.

[0167] In this embodiment, if there are unfinished HARQ processes when the feedback parameters are changed, the timing of the change taking effect can be determined.

[0168] For example, if the feedback content changes, and there are unfinished HARQ processes, the first device determines, based on the changed feedback parameters (i.e., the feedback content), to execute the receiving feedback corresponding to the unfinished HARQ process according to the changed feedback parameters (i.e., the feedback content).

[0169] For example, if the size of the feedback resource changes, and there are unfinished HARQ processes, the first device determines, based on the changed feedback parameters (i.e., the size of the feedback resource), to execute the receiving feedback corresponding to the unfinished HARQ process according to the feedback parameters (i.e., the size of the feedback resource) before the change.

[0170] For example, if the modulation and coding scheme has changed, and there are unfinished HARQ processes, the first device determines, based on the changed feedback parameters (i.e., the modulation and coding scheme), to execute the receiving feedback corresponding to the unfinished HARQ process according to the changed feedback parameters (i.e., the modulation and coding scheme).

[0171] For example, if the CRC bit length changes, and there is an incomplete HARQ process, the first device determines, based on the changed feedback parameters (i.e., the CRC bit length), to execute the receiving feedback corresponding to the incomplete HARQ process according to the changed feedback parameters (i.e., the CRC bit length).

[0172] For example, if the time domain offset changes, and there are unfinished HARQ processes, the first device determines, based on the changed feedback parameters (i.e., the time domain offset), to execute the receiving feedback corresponding to the unfinished HARQ process according to the feedback parameters (i.e., the time domain offset) before the change.

[0173] For example, if the frequency domain offset changes, and there are unfinished HARQ processes, the first device determines, based on the changed feedback parameters (i.e., the frequency domain offset), to execute the receiving feedback corresponding to the unfinished HARQ process according to the feedback parameters (i.e., the frequency domain offset) before the change.

[0174] In some embodiments, the wireless communication method 200 further includes:

[0175] In the event of a reconfiguration of the feedback parameters, the first device performs a MAC entity reset and receives feedback based on the reconfigured feedback parameters.

[0176] In this embodiment, when the feedback parameters are reconfigured, the first device performs a MAC entity reset, which can ensure that the first device and the second device have a consistent understanding of when the reconfigured feedback parameters take effect.

[0177] In some embodiments, during the process of the first device switching from the first cell to the second cell, the relevant configuration fed back by Layer 2 is transmitted from the first cell to the second cell through a handover request.

[0178] In this embodiment, during the process of the first device switching from the first cell to the second cell, the relevant configuration of Layer 2 feedback is transmitted from the first cell to the second cell through a handover request, so that the second cell can configure new Layer 2 feedback configuration for the first device based on the relevant configuration of Layer 2 feedback obtained from the first cell.

[0179] The first cell described in this application embodiment can also be referred to as the source cell, and the second cell described in this application embodiment can also be referred to as the target cell.

[0180] In some embodiments, during the handover process from the first device to the second cell, the wireless communication method 200 further includes:

[0181] The first device receives the second configuration information from the first cell or the second cell; or,

[0182] The first device receives second configuration information from the second device, wherein the second device is the gNB of the first cell or the gNB of the second cell;

[0183] The second configuration information includes, but is not limited to, at least one of the following:

[0184] The first indication information is used to indicate whether the Layer 2 feedback is activated in the second cell;

[0185] The applicable objects of the Layer 2 feedback in the second cell;

[0186] The feedback parameters of layer 2 feedback in the second cell;

[0187] The modulation and coding scheme for Layer 2 feedback in the second cell;

[0188] The CRC information fed back from Layer 2 in the second cell;

[0189] The duplicate information fed back from Layer 2 in the second cell;

[0190] The HARQ feedback information fed back from Layer 2 in the second cell;

[0191] The HARQ retransmission information fed back from Layer 2 in the second cell.

[0192] For example, the second configuration information includes the first indication information, and when the first indication information indicates that the Layer 2 feedback is activated in the second cell, the second configuration information further includes at least one of the following:

[0193] The applicable objects of the Layer 2 feedback in the second cell;

[0194] The feedback parameters of layer 2 feedback in the second cell;

[0195] The modulation and coding scheme for Layer 2 feedback in the second cell;

[0196] The CRC information fed back from Layer 2 in the second cell;

[0197] The duplicate information fed back from Layer 2 in the second cell;

[0198] The HARQ feedback information fed back from Layer 2 in the second cell;

[0199] The HARQ retransmission information fed back from Layer 2 in the second cell.

[0200] In this embodiment, the first device learns whether Layer 2 feedback is activated in the second cell based on the second configuration information. If Layer 2 feedback is activated in the second cell, the first device can also learn the relevant configuration of Layer 2 feedback in the second cell based on the second configuration information.

[0201] Optionally, the second configuration information may also include the relevant configuration of the Layer 1 feedback in the second cell.

[0202] Specifically, prior to S210, the first device receives second configuration information from the first cell or the second cell. Optionally, the first device is a terminal, and the second device is a network-side device (such as the gNB of the first cell or the gNB of the second cell).

[0203] Optionally, the first device receives the second configuration information from the second device. In this case, the second device can be the gNB of the first cell or the gNB of the second cell.

[0204] In some embodiments, during the handover process from the first device to the second cell, the wireless communication method 200 further includes:

[0205] If the feedback parameters of the first cell are reconfigured, the first device performs a MAC entity reset.

[0206] In this embodiment, if the feedback parameters of the first cell are reconfigured during the handover process from the first cell to the second cell, the first device performs a MAC entity reset, which can ensure that the first device and the second device have a consistent understanding of when the reconfigured feedback parameters take effect.

[0207] For example, when the first cell enables a new feedback configuration, regardless of whether the second cell enables a new feedback configuration, because cell handover does not support forwarding and continuity of MAC layer data, all MAC entities are reset, and no data related to the Layer 2 feedback function needs special handling during the handover process.

[0208] In some embodiments, the wireless communication method 200 further includes:

[0209] The first device sends capability information to the second device;

[0210] The capability information includes, but is not limited to, at least one of the following:

[0211] The second instruction information is used to indicate that the first device supports the layer 2 feedback;

[0212] The third indication information is used to indicate that the first device supports the first feature, wherein the device supporting the first feature is a first type of device, and the first type of device supports the layer 2 feedback.

[0213] Specifically, prior to S210, the first device sends the capability information to the second device. For example, the first device is a terminal, and the second device is a network-side device; or, the first device is a first terminal, and the second device is a second terminal.

[0214] In this embodiment, the first device sends capability information to the second device, so that the second device can configure the relevant configurations fed back by the capability information layer 2.

[0215] Therefore, in this embodiment, the first device receives first data from the second device; the first device performs reception feedback for the first data using a target feedback method; wherein, the target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback. In this embodiment, layer 2 feedback has the advantages of high reliability, low latency, and low block error rate. Specifically, by using layer 2 feedback to perform reception feedback for the first data, the first device can improve the reliability of the reception feedback of the first data and reduce the latency of the reception feedback of the first data. Alternatively, the first device can perform reception feedback for the first data using a feedback method selected from layer 1 feedback and layer 2 feedback. The first device can select a suitable feedback method from layer 1 feedback and layer 2 feedback based on actual needs, increasing the flexibility in the implementation of the reception feedback of the first data and improving the feedback performance of the first data. Alternatively, the first device can perform reception feedback for the first data using both layer 1 feedback and layer 2 feedback. By comprehensively considering the results of layer 1 feedback and layer 2 feedback, the reliability of the reception feedback of the first data can be improved.

[0216] The technical solution of this application is described in detail below through specific embodiments.

[0217] Example 1, taking the first device as a terminal (UE), the second device as a network-side device (gNB), and the first data as downlink data as an example, involves the use of Layer 1 feedback or Layer 2 feedback alone, and / or the combined use of Layer 1 feedback and Layer 2 feedback. Optionally, in Example 1, Layer 1 feedback can be PUCCH-based feedback, and Layer 2 feedback can be HARQ process-based feedback implemented using MAC CE.

[0218] In Example 1, the layer 2 feedback can be as follows: Figure 5 As shown.

[0219] In Example 1, in order to perform Layer 2 feedback, the UE needs to obtain at least one of the following configurations and information:

[0220] The UE needs to support Layer 2 feedback. For example, it can be assumed that all 6G UEs support Layer 2 feedback, so that the UE does not need to report Layer 2 feedback capability information separately, but can use other information (such as 6G version information or 6G feature information) to indicate that it is a 6G UE, so that the network side device can know that the UE has the capability of Layer 2 feedback. Alternatively, having Layer 2 feedback in 6G is also a special or separate capability information, which is explicitly indicated by each UE in its own capability report, for example, using 1 bit, to indicate that it supports Layer 2 feedback. In short, the network side needs to know that the UE has this capability.

[0221] For UEs with Layer 2 feedback capability, network-side equipment can comprehensively decide to configure the Layer 2 feedback mechanism for the UE based on factors such as UE capability, UE service information, current network status information, and base station algorithm information. Among these factors, since Layer 2 feedback has a significant advantage over Layer 1 feedback in terms of higher feedback overhead and higher reliability, it is preferred to configure Layer 2 feedback for services with high requirements for block error rate, reliability, and latency. In terms of network conditions, Layer 2 feedback is generally easier to support when the network load is relatively light.

[0222] Network-side equipment configures Layer 2 feedback for the UE. This can be done at the UE-level (per UE) level. For example, once Layer 2 feedback is configured, all services of the UE will use Layer 2 feedback; otherwise, none will be supported, and HARQ feedback will use Layer 1 feedback. Furthermore, Layer 2 feedback can be configured separately for uplink (UL) and downlink (DL). For instance, downlink may support Layer 2 feedback, while uplink may not, or vice versa, or both may support Layer 2 feedback, or neither may support it. It can also be configured for specific services, such as downlink SRB supporting Layer 2 feedback, downlink DRB2 supporting Layer 2 feedback, and downlink MAC CE supporting Layer 2 feedback, while other data does not support Layer 2 feedback. Even the type of downlink MAC CE supporting Layer 2 feedback can be configured individually. For example, downlink MAC CE carrying duplication activation, downlink MAC CE carrying duplication deactivation, downlink MAC CE carrying activated SCell, downlink MAC CE carrying deactivated SCell, and downlink MAC CE carrying DRX commands can all support Layer 2 feedback. CE supports layer 2 feedback, while other downlink MAC CEs use layer 1 feedback;

[0223] Network-side equipment configures Layer 2 feedback parameters for the UE, such as the resource block size, modulation and coding scheme, and CRC bit length. It can also configure the content of the Layer 2 feedback, such as the NACK / ACK mode, NACK only, or ACK only. Furthermore, it can configure the association between the time-domain or frequency-domain location of the Layer 2 feedback and the downlink MAC PDU fed back by the Layer 2 feedback, such as the offset. All these configurations aim to further reduce overhead. If Layer 2 feedback can be semi-statically configured using dedicated RRC signaling, the overhead of dynamically indicating Layer 2 feedback can be eliminated. However, dynamically indicating Layer 2 feedback offers greater flexibility. Alternatively, some information from the Layer 2 feedback can be indicated in the semi-static configuration, while a small number of parameters from the Layer 2 feedback can be indicated in the dynamic signaling (e.g., carrying a small number of Layer 2 feedback parameters in the PDCCH that schedules the downlink MAC PDU). For example, the time-domain offset, i.e., the downlink MAC offset, can be dynamically carried. After the PDU or PDCCH ends, the positions of n slots or symbols are the time-domain positions of the Layer 2 feedback. The value of n is dynamically carried by the PDCCH. This allows for more flexible coordination of the time-domain resource positions of the reserved Layer 2 feedback between UEs, thereby improving resource efficiency.

[0224] Compared to Layer 1 feedback, Layer 2 feedback is more like a MAC packet, allowing for adjustments to modulation and coding schemes (based on link quality), carrying CRC checksums, and even repetition, HARQ feedback, and HARQ retransmission. For example, repetition can be enabled in the PDCCH or RRC signaling, repeating the transmission three times. Alternatively, HARQ feedback and HARQ retransmission mechanisms can be used. Since Layer 2 feedback for downlink data is itself an uplink MAC transmission, if HARQ retransmission is enabled, the network side schedules retransmission resources from the HARQ process to repeat the Layer 2 feedback itself. In short, these methods can further improve the reliability of Layer 2 feedback, thereby achieving fast and accurate feedback on data transmission and improving data transmission reliability and latency performance.

[0225] When a UE is configured with a Layer 2 feedback mechanism for downlink data, after receiving downlink data, the UE will perform Layer 2 feedback at the location indicated by the network side to report the downlink data reception result to the network-side device, based on whether the downlink data decoding was correct. The network-side device then decides whether to retransmit the downlink data based on the Layer 2 feedback.

[0226] When some UEs in the network are configured to use Layer 2 feedback mechanism for downlink data transmission, and others are configured to use Layer 1 feedback mechanism for downlink data transmission, the UEs can work independently according to their respective configurations, and the network and UEs communicate and provide feedback according to the configuration and instructions.

[0227] Optionally, when a UE's downlink data transmission supports both Layer 2 and Layer 1 feedback mechanisms, the method for ensuring accurate transmission and feedback between the UE and the network side includes at least one of the following:

[0228] First, it is necessary to distinguish the feedback method corresponding to the data type according to the network configuration or the protocol agreement. Common conventions or configurations include SRB1 adopting the layer 2 feedback method, all downlink MAC CEs or some important downlink MAC CEs with high latency and reliability requirements adopting the layer 2 feedback method, and some data with high latency and reliability requirements adopting the layer 2 feedback method. These data can be based on DRB granularity, such as DRB1 adopting the layer 2 feedback method, etc.

[0229] For downlink data, since the network-side equipment organizes the data transmission, it ultimately determines the feedback method of the MAC PDU based on the data type and composition, and explicitly instructs the UE accordingly. For example, if the MAC PDU contains any data that requires Layer 2 feedback, the entire MAC PDU adopts Layer 2 feedback; conversely, if the MAC PDU does not contain any data that requires Layer 2 feedback, the entire MAC PDU adopts Layer 1 feedback. Alternatively, the feedback method of the entire MAC PDU can be directly determined based on the feedback type corresponding to the highest priority data in the MAC PDU.

[0230] If the network-side equipment explicitly carries the feedback method for this transmission in the downlink signaling, such as PDCCH, for example, either Layer 2 feedback or Layer 1 feedback, then after the UE receives the data, it will provide feedback according to the indicated feedback method.

[0231] In Example 1, the UE and the network-side equipment can use PUCCH and / or MAC CE to perform transmission feedback operations to compensate for the latency and reliability issues of feedback in related technologies, thereby improving the transmission efficiency and service experience of UE data and ensuring system efficiency while enhancing data transmission performance.

[0232] Example 2, taking the first device as a terminal (UE), the second device as a network-side device (gNB), and the first data as downlink data as an example, involves the use of Layer 1 feedback or Layer 2 feedback alone, and / or the combined use of Layer 1 feedback and Layer 2 feedback. Optionally, in Example 2, Layer 1 feedback can be PUCCH-based feedback, and Layer 2 feedback can be HARQ process-based feedback implemented using MAC CE.

[0233] For downlink data, different feedback configurations and indications can be applied to different UEs or different data from different UEs. This embodiment goes further, considering the transmission and retransmission of the same data packet, different feedback methods can also be indicated.

[0234] In Example 2, as Figure 6 As shown, when the base station schedules the first transmission of downlink data, it instructs the UE to use Layer 1 feedback. For each subsequent retransmission, it can also explicitly indicate whether to use Layer 1 or Layer 2 feedback. Generally, multiple retransmissions occur only when the UE's link quality is poor. Therefore, for subsequent retransmissions, it can explicitly instruct to use Layer 2 feedback to improve the accuracy of the feedback and avoid NACK being mistakenly detected as ACK, causing packet loss and transmission failure.

[0235] Furthermore, for data initially transmitted and judged to be Layer 1 feedback based on business conditions, if multiple transmissions fail, it can be determined that the link is poor, and subsequent transmissions can be switched to Layer 2 feedback, thereby improving the accuracy of feedback.

[0236] Specifically, since Layer 1 feedback and Layer 2 feedback are generally configured on different frequency and time domain resources, it is possible that both Layer 1 and Layer 2 feedback may be enabled simultaneously for a particular transmission or retransmission. For the UE, the feedback method indicated by the network side is followed. If both are required, feedback is sent once at the resource location corresponding to Layer 1 feedback, and then again at the resource location corresponding to Layer 2 feedback. This way, the network device considers both results to arrive at the final result. For example, if the CRC check of Layer 2 feedback is correct, Layer 2 feedback takes precedence; only when the CRC check of Layer 2 feedback fails is the feedback result of Layer 1 feedback considered.

[0237] Furthermore, for cases where only Layer 2 feedback is received, a comprehensive judgment mechanism is introduced to improve the accuracy of feedback, including at least one of the following:

[0238] Since Layer 2 feedback can include CRC check, if the CRC check fails when Layer 2 feedback is in the ACK / NACK mode, it can be considered that an ACK->NACK, NACK->ACK error has occurred, so it can be corrected.

[0239] Since MAC CE transmission has higher detectability than PUCCH, it can simply perform ACK only or NACK only feedback. That is, Layer 2 feedback is only performed when the reception is correct, or only when the reception is incorrect. In this way, the receiving side can determine whether there is feedback by detecting the received level, and thus determine whether it is ACK or NACK. At the same time, for example, NACK only means that there is only a very small probability, about 10%, of sending feedback. Therefore, the interference of feedback resources to other transmissions can be reduced, further improving the detection success rate.

[0240] Example 3, taking the first device as the terminal (UE), the second device as the network-side device (gNB), and the first data as uplink data as an example.

[0241] Since uplink scheduling is still handled by the base station, there is currently no feedback for uplink transmission. That is, the base station does not need to explicitly provide ACK / NACK feedback to the UE based on the reception status. Instead, it directly schedules retransmissions through the HARQ process. For example, if reception fails, the base station directly schedules the same HARQ process for retransmission. The UE then knows that the previous transmission failed (equivalent to NACK) and retransmits according to the retransmission schedule. If the base station receives successfully, it directly schedules the next data packet, assigning the HARQ process to a new data packet and flipping or resetting the New Data Indicator (NDI) to indicate a new transmission. The UE then considers the previous data packet successful (equivalent to ACK). Figure 7 As shown.

[0242] Since there is no explicit ACK / NACK feedback in the uplink transmission, the newly introduced Layer 2 feedback does not need to be performed for the uplink transmission. Moreover, the PDCCH scheduling (retransmission / newtransmission / NDI, etc.) serves as the indirect uplink feedback mechanism, and PDCCH scheduling has high reliability. Therefore, single-time feedback in the uplink transmission does not need to be enhanced.

[0243] Optionally, uplink transmission may use layer 1 feedback or layer 2 feedback, or uplink transmission may use both layer 1 feedback and layer 2 feedback. This embodiment does not limit this.

[0244] Example 4, taking the first device as the terminal (UE), the second device as the network-side device (gNB), and the first data as downlink data as an example, involves the use of Layer 1 feedback or Layer 2 feedback alone, and / or the combined use of Layer 1 feedback and Layer 2 feedback. Optionally, in Example 4, Layer 1 feedback can be PUCCH-based feedback, and Layer 2 feedback can be HARQ process-based feedback implemented using MAC CE.

[0245] When the feedback functionality is reconfigured, such as by changing the feedback method or altering the feedback parameters, at least one of the following reconfiguration behaviors is allowed:

[0246] If the feedback method has changed, and there are still unfinished HARQ processes, they will continue to be executed according to the feedback method before the reconfiguration until the HARQ process is finished. When a new HARQ process is transmitted, the new feedback method will be adopted.

[0247] If the feedback parameters have changed, you can decide whether to execute the unfinished HARQ process immediately or wait for the HARQ process to continue using the parameters before reconfiguration, and then adopt the new feedback method when the new HARQ process is transmitted.

[0248] Alternatively, a synchronous reconfiguration approach can be adopted. When the reconfigured parameters require both ends to execute the new parameters synchronously, otherwise an error will occur, a synchronous reconfiguration approach is needed. For example, the MAC can be reset, and after random access and resynchronization are obtained, the new configuration can be used.

[0249] The UE will also undergo handover, involving configuration transfer and state transition between the source and target cells, including at least one of the following related operations:

[0250] When the source cell makes a handover request to the target cell, it can send the relevant configurations fed back from Layer 2 and / or Layer 1 to the target cell, so that the target cell can decide on the new configuration for the UE.

[0251] The target cell configures new Layer 2 feedback configurations and / or Layer 1 feedback configurations for the UE. These configurations may include Layer 2 feedback configurations in the target cell, such as enabling / disabling, applicable objects, parameter configurations, etc. The source cell sends these configurations to the UE via a handover command, and the UE executes them in the target cell.

[0252] When the source cell is configured with new Layer 2 feedback configurations and / or Layer 1 feedback configurations, regardless of whether the target cell has enabled new feedback configurations, because cell handover does not support forwarding and continuity of MAC layer data, all MAC entities are reset, and no data related to Layer 2 feedback functions requires special handling during the handover process.

[0253] The wireless communication method provided in this application can be executed by a wireless communication device. This application uses an example of a wireless communication device executing the wireless communication method to illustrate the wireless communication device provided in this application.

[0254] This application provides a wireless communication device. As an example, the wireless communication device may be a communication equipment or a component within a communication equipment, such as a chip. The communication equipment may be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal may include, but is not limited to, the type of terminal 11 listed above, and the network-side device may include, but is not limited to, the type of network-side device 12 listed above. This application does not impose specific limitations.

[0255] The wireless communication device includes a receiving module, a transmitting module, and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, such as a Central Processing Unit (CPU), microprocessor, Digital Signal Processor (DSP), Artificial Intelligence (AI) processor, Graphics Processing Unit (GPU), Application Specific Integrated Circuit (ASIC), Network Processor (NP), Field Programmable Gate Array (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving and transmitting modules can be implemented by a communication interface, which can include one or more of the following: transceiver, pins, circuits, bus, radio frequency unit, etc.

[0256] For details, see Figure 8 When the wireless communication device is the first device or a component of the first device, the wireless communication device 300 includes:

[0257] Receiver module 301 is used to receive first data from the second device;

[0258] The sending module 302 is used to perform receiving feedback for the first data using a target feedback method;

[0259] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0260] In some embodiments, the layer 2 feedback includes feedback for the Hybrid Automatic Repeat Request (HARQ) process implemented based on the Media Access Control Layer (MAC) CE control unit; and / or,

[0261] The Layer 1 feedback includes at least one of the following: feedback based on the Physical Uplink Control Channel (PUCCH) and feedback based on the Physical Sidelink Control Channel (PSCCH).

[0262] In some embodiments, the receiving module 301 is further configured to receive first configuration information from the second device;

[0263] The first configuration information includes the relevant configurations fed back by layer 2;

[0264] The relevant configuration for the feedback of layer 2 includes at least one of the following:

[0265] The applicable objects of the feedback from layer 2;

[0266] The feedback parameters of layer 2;

[0267] The modulation and coding scheme of the layer 2 feedback;

[0268] The CRC information fed back by layer 2;

[0269] The repeated information fed back by layer 2;

[0270] The HARQ feedback information fed back by layer 2;

[0271] The HARQ retransmission information fed back by layer 2.

[0272] In some embodiments, the applicable objects of the layer 2 feedback include at least one of the following:

[0273] All services of the wireless communication device 300, uplink services of the wireless communication device 300, downlink services of the wireless communication device 300, sidelink services of the wireless communication device 300, specific services of the wireless communication device 300, and specific MAC CE of the wireless communication device 300.

[0274] The specific business includes at least one of the following:

[0275] Downlink signaling radio bearer (SRB), downlink data radio bearer (DRB), downlink MAC CE, sideline SRB, sideline DRB, sideline MAC CE;

[0276] The specific MAC CE includes at least one of the following:

[0277] MAC CE carrying a copy transmission activation indication, MAC CE carrying a copy transmission deactivation indication, MAC CE carrying a secondary cell SCell activation indication, MAC CE carrying a SCell deactivation indication, and MAC CE carrying a discontinuous reception DRX command.

[0278] In some embodiments, the feedback parameters of the layer 2 feedback include at least one of the following: the size of the feedback resource, the feedback content, the modulation and coding scheme, the number of CRC bits, the time domain offset, and the frequency domain offset.

[0279] The feedback content includes one of the following:

[0280] Negative response NACK or positive response ACK, NACK only, ACK only;

[0281] Wherein, the time-domain offset is the offset between the time-domain position of the data fed back by layer 2 and the time-domain position of the data fed back by layer 2;

[0282] Wherein, the frequency domain offset is the offset between the frequency domain position of the feedback from layer 2 and the frequency domain position of the data fed back by layer 2.

[0283] In some embodiments, the wireless communication device 300 further includes: a processing module 303;

[0284] The receiving module 301 is further configured to receive first information from the second device; wherein the first information is used to indicate the target feedback method; or...

[0285] The processing module 303 is used to determine the target feedback method based on the protocol agreement information.

[0286] In some embodiments, the target feedback method is determined based on at least one of the following: the type of the first data, the composition of the first data, the priority of the first data, the transmission delay requirement of the first data, the transmission error rate requirement of the first data, the transmission reliability requirement of the first data, and the network load.

[0287] In some embodiments, the first data is a Media Access Control Protocol Data Unit (MAC PDU);

[0288] If the MAC PDU includes any type of data that requires feedback from Layer 2, the target feedback method includes Layer 2 feedback, or the target feedback method includes both Layer 1 feedback and Layer 2 feedback; or, if the MAC PDU does not include data that requires feedback from Layer 2, the target feedback method is Layer 1 feedback; and / or,

[0289] If the highest priority data in the MAC PDU corresponds to the layer 2 feedback, the target feedback method includes the layer 2 feedback; or, the target feedback method includes both layer 1 feedback and layer 2 feedback. Alternatively, if the highest priority data in the MAC PDU corresponds to the layer 1 feedback, the target feedback method includes the layer 1 feedback.

[0290] In some embodiments, the receiving module 301 is further configured to receive second information from the second device;

[0291] Wherein, the second information is used to indicate that the current transmission or retransmission of the first data uses the feedback of layer 1 or the feedback of layer 2, or the second information is used to indicate that the kth retransmission of the first data uses the feedback of layer 1 or the feedback of layer 2, or the second information is used to indicate the feedback method used for the subsequent s retransmissions of the first data.

[0292] Where k and s are both positive integers.

[0293] In some embodiments, if the feedback method corresponding to the initial transmission of the first data is layer 1 feedback, then the feedback method corresponding to the retransmission of the first data is layer 2 feedback; or...

[0294] If the feedback method corresponding to the initial transmission of the first data and the feedback method corresponding to at least one retransmission of the first data are both layer 1 feedback, then the feedback method corresponding to the retransmission after the at least one retransmission of the first data are all layer 2 feedback.

[0295] In some embodiments, if the feedback method has changed and there are unfinished HARQ processes, the sending module 302 is further configured to execute the receiving feedback corresponding to the unfinished HARQ processes according to the feedback method before the change, until the unfinished HARQ processes end; and / or, if the feedback method has changed and there are unfinished HARQ processes, after the unfinished HARQ processes end, the sending module 302 is further configured to execute the receiving feedback corresponding to the subsequent HARQ processes according to the feedback method after the change;

[0296] And / or,

[0297] If there are unfinished HARQ processes when the feedback parameters have changed, the sending module 302 is further configured to determine, based on the changed feedback parameters, to execute the receiving feedback corresponding to the unfinished HARQ process according to the feedback parameters before the change; or, the sending module 302 is further configured to determine, based on the changed feedback parameters, to execute the receiving feedback corresponding to the unfinished HARQ process according to the feedback parameters after the change.

[0298] And / or,

[0299] In the event of a reconfiguration of the feedback parameters, the processing module 303 is further configured to perform a Media Access Control (MAC) entity reset, and the sending module 302 is further configured to perform a receiving feedback based on the reconfigured feedback parameters.

[0300] In some embodiments, during the process of the wireless communication device 300 switching from a first cell to a second cell, the relevant configuration fed back by Layer 2 is transmitted from the first cell to the second cell through a handover request.

[0301] In some embodiments, during the process of the wireless communication device 300 switching from a first cell to a second cell, the receiving module 301 is further configured to receive second configuration information from the first cell or the second cell;

[0302] The second configuration information includes at least one of the following:

[0303] The first indication information is used to indicate whether the Layer 2 feedback is activated in the second cell;

[0304] The applicable objects of the Layer 2 feedback in the second cell;

[0305] The feedback parameters of layer 2 feedback in the second cell;

[0306] The modulation and coding scheme for Layer 2 feedback in the second cell;

[0307] The CRC information fed back from Layer 2 in the second cell;

[0308] The duplicate information fed back from Layer 2 in the second cell;

[0309] The HARQ feedback information fed back from Layer 2 in the second cell;

[0310] The HARQ retransmission information fed back from Layer 2 in the second cell.

[0311] In some embodiments, during the process of the wireless communication device 300 switching from a first cell to a second cell, the wireless communication device 300 further includes: a processing module 303;

[0312] If the feedback parameters of the first cell are reconfigured, the processing module 303 performs a MAC entity reset.

[0313] In some embodiments, the sending module 302 is further configured to send capability information to the second device;

[0314] The capability information includes at least one of the following:

[0315] The second instruction information is used to instruct the wireless communication device 300 to support the layer 2 feedback;

[0316] The third indication information is used to indicate that the wireless communication device 300 supports a first feature, wherein the device supporting the first feature is a first type of device, and the first type of device supports the layer 2 feedback.

[0317] See Figure 9 When the wireless communication device is a second device or a component of a second device, the wireless communication device 400 includes:

[0318] The sending module 401 is used to send first data to the first device;

[0319] The receiving module 402 is configured to receive receiving feedback from the first device regarding the first data, which is performed by the first device using a target feedback method.

[0320] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0321] In some embodiments, the layer 2 feedback includes feedback for the Hybrid Automatic Repeat Request (HARQ) process implemented based on the Media Access Control Layer (MAC) CE control unit; and / or,

[0322] The Layer 1 feedback includes at least one of the following: feedback based on the Physical Uplink Control Channel (PUCCH) and feedback based on the Physical Sidelink Control Channel (PSCCH).

[0323] In some embodiments, the sending module 401 is further configured to send first configuration information to the first device;

[0324] The first configuration information includes the relevant configurations fed back by layer 2;

[0325] The relevant configuration for the feedback of layer 2 includes at least one of the following:

[0326] The applicable objects of the feedback from layer 2;

[0327] The feedback parameters of layer 2;

[0328] The modulation and coding scheme of the layer 2 feedback;

[0329] The CRC information fed back by layer 2;

[0330] The repeated information fed back by layer 2;

[0331] The HARQ feedback information fed back by layer 2;

[0332] The HARQ retransmission information fed back by layer 2.

[0333] In some embodiments, the applicable objects of the layer 2 feedback include at least one of the following:

[0334] All services of the first device, uplink services of the first device, downlink services of the first device, side-link services of the first device, specific services of the first device, and specific MAC CE of the first device;

[0335] The specific business includes at least one of the following:

[0336] Downlink signaling radio bearer (SRB), downlink data radio bearer (DRB), downlink MAC CE, sideline SRB, sideline DRB, sideline MAC CE;

[0337] The specific MAC CE includes at least one of the following:

[0338] MAC CE carrying a copy transmission activation indication, MAC CE carrying a copy transmission deactivation indication, MAC CE carrying a secondary cell SCell activation indication, MAC CE carrying a SCell deactivation indication, and MAC CE carrying a discontinuous reception DRX command.

[0339] In some embodiments, the feedback parameters of the layer 2 feedback include at least one of the following: the size of the feedback resource, the feedback content, the modulation and coding scheme, the number of CRC bits, the time domain offset, and the frequency domain offset.

[0340] The feedback content includes one of the following:

[0341] Negative response NACK or positive response ACK, NACK only, ACK only;

[0342] Wherein, the time-domain offset is the offset between the time-domain position of the data fed back by layer 2 and the time-domain position of the data fed back by layer 2;

[0343] Wherein, the frequency domain offset is the offset between the frequency domain position of the feedback from layer 2 and the frequency domain position of the data fed back by layer 2.

[0344] In some embodiments, the sending module 401 is further configured to send first information to the first device; wherein the first information is used to indicate the target feedback method.

[0345] In some embodiments, the target feedback method is determined based on at least one of the following: the type of the first data, the composition of the first data, the priority of the first data, the transmission delay requirement of the first data, the transmission error rate requirement of the first data, the transmission reliability requirement of the first data, and the network load.

[0346] In some embodiments, the sending module 401 is further configured to send second information to the first device;

[0347] Wherein, the second information is used to indicate that the current transmission or retransmission of the first data uses the feedback of layer 1 or the feedback of layer 2, or the second information is used to indicate that the kth retransmission of the first data uses the feedback of layer 1 or the feedback of layer 2, or the second information is used to indicate the feedback method used for the subsequent s retransmissions of the first data.

[0348] Where k and s are both positive integers.

[0349] In some embodiments, during the process of the first device switching from the first cell to the second cell, the relevant configuration fed back by Layer 2 is transmitted from the first cell to the second cell through a handover request.

[0350] In some embodiments, during the process of the first device switching from the first cell to the second cell, the sending module 401 is further configured to send second configuration information to the first device;

[0351] The second configuration information includes at least one of the following:

[0352] The first indication information is used to indicate whether the Layer 2 feedback is activated in the second cell;

[0353] The applicable objects of the Layer 2 feedback in the second cell;

[0354] The feedback parameters of layer 2 feedback in the second cell;

[0355] The modulation and coding scheme for Layer 2 feedback in the second cell;

[0356] The CRC information fed back from Layer 2 in the second cell;

[0357] The duplicate information fed back from Layer 2 in the second cell;

[0358] The HARQ feedback information fed back from Layer 2 in the second cell;

[0359] The HARQ retransmission information fed back from Layer 2 in the second cell.

[0360] In some embodiments, the receiving module 402 is further configured to receive capability information from the first device;

[0361] The capability information includes at least one of the following:

[0362] The second instruction information is used to indicate that the first device supports the layer 2 feedback;

[0363] The third indication information is used to indicate that the first device supports the first feature, wherein the device supporting the first feature is a first type of device, and the first type of device supports the layer 2 feedback.

[0364] Therefore, in this embodiment, the first device receives first data from the second device; the first device performs reception feedback for the first data using a target feedback method; wherein, the target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback. In this embodiment, layer 2 feedback has the advantages of high reliability, low latency, and low block error rate. Specifically, by using layer 2 feedback to perform reception feedback for the first data, the first device can improve the reliability of the reception feedback of the first data and reduce the latency of the reception feedback of the first data. Alternatively, the first device can perform reception feedback for the first data using a feedback method selected from layer 1 feedback and layer 2 feedback. The first device can select a suitable feedback method from layer 1 feedback and layer 2 feedback based on actual needs, increasing the flexibility in the implementation of the reception feedback of the first data and improving the feedback performance of the first data. Alternatively, the first device can perform reception feedback for the first data using both layer 1 feedback and layer 2 feedback. By comprehensively considering the results of layer 1 feedback and layer 2 feedback, the reliability of the reception feedback of the first data can be improved.

[0365] The wireless communication device provided in this application embodiment can achieve... Figure 4 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0366] like Figure 10 As shown in the figure, this application embodiment also provides a communication device 500, including a processor 501 and a memory 502, wherein the memory 502 stores a program or instructions that can be run on the processor 501.

[0367] For example, when the communication device 500 is the first device, the program or instruction executed by the processor 501 implements the various steps executed by the first device in the above wireless communication method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0368] For example, when the communication device 500 is a second device, the program or instruction executed by the processor 501 implements the various steps executed by the second device in the above wireless communication method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0369] This application embodiment also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement, for example... Figure 4 The steps in the method embodiment shown are illustrated. This terminal embodiment corresponds to the first device-side method embodiment or the second device-side method embodiment described above. All implementation processes and methods of the above method embodiments can be applied to this terminal embodiment and achieve the same technical effect. The terminal can be... Figure 8 The wireless communication device 300 shown Figure 9 The wireless communication device 400 shown. Specifically, Figure 11 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0370] The terminal 600 includes, but is not limited to, at least some of the following components: radio frequency unit 601, network module 602, audio output unit 603, input unit 604, sensor 605, display unit 606, user input unit 607, interface unit 608, memory 609, and processor 610.

[0371] Those skilled in the art will understand that the terminal 600 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 610 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 11 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0372] It should be understood that, in this embodiment, the input unit 604 may include a graphics processor 6041 and a microphone 6042. The graphics processor 6041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 606 may include a display panel 6061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 607 includes at least one of a touch panel 6071 and other input devices 6072. The touch panel 6071 is also called a touch screen. The touch panel 6071 may include two parts: a touch detection device and a touch controller. Other input devices 6072 may include, but are not limited to, a physical keyboard, function keys (such as volume control buttons, power buttons, etc.), a trackball, a mouse, and a joystick, which will not be described in detail here.

[0373] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 601 can transmit it to the processor 610 for processing; in addition, the radio frequency unit 601 can send uplink data to the network-side device. Typically, the radio frequency unit 601 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0374] The memory 609 can be used to store software programs or instructions, as well as various data. The memory 609 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 609 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 609 in this embodiment includes, but is not limited to, these and any other suitable types of memory.

[0375] Processor 610 may include one or more processing units; optionally, processor 610 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 610.

[0376] In some embodiments, the first device is a terminal;

[0377] The radio frequency unit 601 is used to receive first data from the second device;

[0378] The radio frequency unit 601 is also used to perform reception feedback for the first data using a target feedback method;

[0379] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0380] In some embodiments, the second device is a terminal;

[0381] The radio frequency unit 601 is used to send first data to the first device;

[0382] The radio frequency unit 601 is also configured to receive reception feedback for the first data performed by the first device using a target feedback method from the first device;

[0383] The target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback.

[0384] Therefore, in this embodiment, the first device receives first data from the second device; the first device performs reception feedback for the first data using a target feedback method; wherein, the target feedback method includes one of the following: layer 2 feedback, a feedback method selected from layer 1 feedback and layer 2 feedback, or layer 1 feedback and layer 2 feedback. In this embodiment, layer 2 feedback has the advantages of high reliability, low latency, and low block error rate. Specifically, by using layer 2 feedback to perform reception feedback for the first data, the first device can improve the reliability of the reception feedback of the first data and reduce the latency of the reception feedback of the first data. Alternatively, the first device can perform reception feedback for the first data using a feedback method selected from layer 1 feedback and layer 2 feedback. The first device can select a suitable feedback method from layer 1 feedback and layer 2 feedback based on actual needs, increasing the flexibility in the implementation of the reception feedback of the first data and improving the feedback performance of the first data. Alternatively, the first device can perform reception feedback for the first data using both layer 1 feedback and layer 2 feedback. By comprehensively considering the results of layer 1 feedback and layer 2 feedback, the reliability of the reception feedback of the first data can be improved.

[0385] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the method embodiment and achieve the same or corresponding technical effect. To avoid repetition, it will not be described again here.

[0386] This application embodiment also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement, for example... Figure 4 The steps of the method embodiment shown are illustrated. This network-side device embodiment corresponds to the method embodiment executed by the first or second device described above. All implementation processes and methods of the above method embodiments can be applied to this network-side device embodiment and can achieve the same technical effect.

[0387] Specifically, embodiments of this application also provide a network-side device, which can be... Figure 8 The wireless communication device 300 shown Figure 9 The wireless communication device 400 is shown. (For example...) Figure 12 As shown, the network-side device 700 includes: an antenna 71, a radio frequency (RF) device 72, a baseband device 73, a processor 74, and a memory 75. The antenna 71 is connected to the RF device 72. In the uplink direction, the RF device 72 receives information through the antenna 71 and transmits the received information to the baseband device 73 for processing. In the downlink direction, the baseband device 73 processes the information to be transmitted and sends it to the RF device 72. The RF device 72 processes the received information and transmits it through the antenna 71.

[0388] The method executed by the first or second device in the above embodiments can be implemented in the baseband device 73, which includes a baseband processor.

[0389] The baseband device 73 may, for example, include at least one baseband board on which multiple chips are disposed, such as... Figure 12 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 75 via a bus interface to call the program in the memory 75 and execute the operation of the first or second device shown in the above method embodiment.

[0390] The network-side device may also include a network interface 76, such as a Common Public Radio Interface (CPRI).

[0391] Specifically, the network-side device 700 in this application embodiment further includes: instructions or programs stored in memory 75 and executable on processor 74, wherein processor 74 calls the instructions or programs in memory 75 to execute. Figure 8 or Figure 9 The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0392] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described wireless communication method embodiments and achieve the same technical effects. To avoid repetition, they will not be described again here.

[0393] The processor is the processor in the first or second device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0394] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described wireless communication method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0395] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0396] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described wireless communication method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0397] This application also provides a wireless communication system, including a first device and a second device. The first device can be used to perform the steps performed by the first device in the wireless communication method described above, and the second device can be used to perform the steps performed by the second device in the wireless communication method described above.

[0398] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0399] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0400] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A method of wireless communication, the method comprising: Comprising: a first device receiving first data from a second device; the first device performing receiving feedback for the first data using a target feedback mode; wherein the target feedback mode comprises one of: layer 2 feedback, layer 1 feedback, a feedback mode selected from layer 1 feedback and layer 2 feedback, and layer 2 feedback.

2. The method of claim 1, wherein: the layer 2 feedback comprises feedback for a hybrid automatic repeat request (HARQ) process based on a medium access control (MAC) control element (CE); and / or the layer 1 feedback comprises at least one of: feedback based on a physical uplink control channel (PUCCH), and feedback based on a physical sidelink control channel (PSCCH).

3. The method according to claim 1 or 2, characterized in that, The method further comprises: the first device receiving first configuration information from the second device; wherein the first configuration information comprises related configuration of the layer 2 feedback; wherein the related configuration of the layer 2 feedback comprises at least one of: a target of the layer 2 feedback; a feedback parameter of the layer 2 feedback; a modulation and coding mode of the layer 2 feedback; cyclic redundancy check (CRC) information of the layer 2 feedback; repetition information of the layer 2 feedback; HARQ feedback information of the layer 2 feedback; HARQ retransmission information of the layer 2 feedback.

4. The method of claim 3, wherein: the target of the layer 2 feedback comprises at least one of: all services of the first device, uplink services of the first device, downlink services of the first device, sidelink services of the first device, specific services of the first device, and specific MAC CEs of the first device; wherein the specific services comprise at least one of: downlink signaling radio bearers (SRBs), downlink data radio bearers (DRBs), downlink MAC CEs, sidelink SRBs, sidelink DRBs, and sidelink MAC CEs; wherein the specific MAC CEs comprise at least one of: a MAC CE carrying a copy transmission activation indication, a MAC CE carrying a copy transmission deactivation indication, a MAC CE carrying a secondary cell (SCell) activation indication, a MAC CE carrying a SCell deactivation indication, and a MAC CE carrying a discontinuous reception (DRX) command.

5. The method of claim 3 or 4, wherein: the feedback parameter of the layer 2 feedback comprises at least one of: a size of a feedback resource, feedback content, a modulation and coding mode, a number of CRC bits, a time domain offset, and a frequency domain offset; wherein the feedback content comprises one of: a negative acknowledgement (NACK) or an acknowledgement (ACK), only a NACK, and only an ACK; wherein the time domain offset is an offset between a time domain position of the layer 2 feedback and a time domain position of data fed back by the layer 2 feedback; wherein the frequency domain offset is an offset between a frequency domain position of the layer 2 feedback and a frequency domain position of data fed back by the layer 2 feedback.

6. The method according to any one of claims 1 to 5, characterized in that, The method further comprises: the first device receiving first information from the second device; wherein the first information is used to indicate the target feedback mode; or, The first device determines the target feedback mode based on the protocol agreement information.

7. The method of claim 6, wherein, The target feedback mode is determined based on at least one of the following: a type of the first data, a composition of the first data, a priority of the first data, a transmission delay requirement of the first data, a transmission block error rate requirement of the first data, a transmission reliability requirement of the first data, and a network load.

8. The method of claim 7, wherein, The first data is a medium access control protocol data unit (MAC PDU). If the MAC PDU includes any data requiring the layer 2 feedback, the target feedback mode includes the layer 2 feedback, or the target feedback mode includes both the layer 1 feedback and the layer 2 feedback; or if the MAC PDU does not include data requiring the layer 2 feedback, the target feedback mode is the layer 1 feedback. And / or, If the highest priority data in the MAC PDU corresponds to the layer 2 feedback, the target feedback mode includes the layer 2 feedback, or the target feedback mode includes both the layer 1 feedback and the layer 2 feedback; or if the highest priority data in the MAC PDU corresponds to the layer 1 feedback, the target feedback mode is the layer 1 feedback.

9. The method according to any one of claims 1 to 8, characterized in that, The method further includes: The first device receives second information from the second device. The second information indicates that the first data uses the layer 1 feedback or the layer 2 feedback for the current transmission or retransmission, or the second information indicates that the first data uses the layer 1 feedback or the layer 2 feedback for the kth retransmission, or the second information indicates the feedback mode used for the subsequent s retransmissions of the first data. k and s are positive integers.

10. The method of any one of claims 1 to 9, wherein, If the feedback mode corresponding to the initial transmission of the first data is the layer 1 feedback, the feedback mode corresponding to the retransmission of the first data is the layer 2 feedback. Or, If the feedback mode corresponding to the initial transmission of the first data and the feedback mode corresponding to at least one retransmission of the first data are both the layer 1 feedback, the feedback mode corresponding to the retransmission after the at least one retransmission of the first data is the layer 2 feedback.

11. The method according to any one of claims 1 to 10, characterized in that, The method further includes: If there is an unexecuted HARQ process after the feedback mode is changed, the first device performs the receiving feedback corresponding to the unexecuted HARQ process according to the feedback mode before the change until the unexecuted HARQ process is completed; and / or if there is an unexecuted HARQ process after the feedback mode is changed, the first device performs the receiving feedback corresponding to the subsequent HARQ process according to the feedback mode after the change after the unexecuted HARQ process is completed. And / or, In a case where the feedback parameter is changed, if there is an unexecuted HARQ process, the first device determines, based on the changed feedback parameter, to perform receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter before the change, or the first device determines, based on the changed feedback parameter, to perform receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter after the change. And / or, In a case where the feedback parameter is reconfigured, the first device performs a medium access control (MAC) entity reset, and the first device performs receiving feedback based on the reconfigured feedback parameter.

12. The method of any one of claims 1-11, wherein, In a process in which the first device switches from a first cell to a second cell, a related configuration of the layer 2 feedback is delivered by the first cell to the second cell through a handover request.

13. The method of any one of claims 1-12, wherein, In a process in which the first device switches from a first cell to a second cell, the method further comprises: the first device receives second configuration information from the first cell or the second cell; wherein the second configuration information comprises at least one of: first indication information indicating whether the layer 2 feedback is activated in the second cell; a subject of the layer 2 feedback in the second cell; a feedback parameter of the layer 2 feedback in the second cell; a modulation and coding mode of the layer 2 feedback in the second cell; CRC information of the layer 2 feedback in the second cell; repetition information of the layer 2 feedback in the second cell; HARQ feedback information of the layer 2 feedback in the second cell; HARQ retransmission information of the layer 2 feedback in the second cell.

14. The method of any one of claims 1-13, wherein, In a process in which the first device switches from a first cell to a second cell, the method further comprises: if a feedback parameter of the first cell is reconfigured, the first device performs a MAC entity reset.

15. The method according to any one of claims 1 to 14, characterized in that, The method further comprises: the first device sends capability information to the second device; wherein the capability information comprises at least one of: second indication information indicating that the first device supports the layer 2 feedback; third indication information indicating that the first device supports a first feature, wherein a device supporting the first feature is a first type of device, and the first type of device supports the layer 2 feedback.

16. A method of wireless communication, the method comprising: comprises: the second device sends first data to the first device; the second device receives, from the first device, receiving feedback performed by the first device for the first data using a target feedback mode; wherein the target feedback mode comprises one of: layer 2 feedback, a feedback mode selected from layer 1 feedback and layer 2 feedback, layer 1 feedback, and layer 2 feedback.

17. The method of claim 16, wherein: the layer 2 feedback comprises feedback for a hybrid automatic repeat request (HARQ) process based on a medium access control (MAC) control element (CE); and / or, The layer 1 feedback comprises at least one of: physical uplink control channel (PUCCH) based feedback, physical sidelink control channel (PSCCH) based feedback.

18. The method of claim 16 or 17, wherein, The method further comprises: The second device sends first configuration information to the first device; The first configuration information comprises configuration related to the layer 2 feedback; The configuration related to the layer 2 feedback comprises at least one of: a subject of the layer 2 feedback; a feedback parameter of the layer 2 feedback; a modulation and coding scheme of the layer 2 feedback; cyclic redundancy check (CRC) information of the layer 2 feedback; repetition information of the layer 2 feedback; HARQ feedback information of the layer 2 feedback; HARQ retransmission information of the layer 2 feedback.

19. The method of claim 18, wherein: The subject of the layer 2 feedback comprises at least one of: all services of the first device, uplink services of the first device, downlink services of the first device, sidelink services of the first device, specific services of the first device, specific MAC CEs of the first device; The specific services comprise at least one of: downlink signaling radio bearer (SRB), downlink data radio bearer (DRB), downlink MAC CE, sidelink SRB, sidelink DRB, sidelink MAC CE; The specific MAC CEs comprise at least one of: MAC CE carrying a copy transmission activation indication, MAC CE carrying a copy transmission deactivation indication, MAC CE carrying a secondary cell (SCell) activation indication, MAC CE carrying a SCell deactivation indication, MAC CE carrying a discontinuous reception (DRX) command.

20. The method of claim 18 or 19, wherein: The feedback parameter of the layer 2 feedback comprises at least one of: a size of a feedback resource, feedback content, a modulation and coding scheme, a number of CRC bits, a time domain offset, a frequency domain offset; The feedback content comprises one of: negative acknowledgement (NACK) or acknowledgement (ACK), NACK only, ACK only; The time domain offset is an offset between a time domain position of the layer 2 feedback and a time domain position of data fed back by the layer 2 feedback; The frequency domain offset is an offset between a frequency domain position of the layer 2 feedback and a frequency domain position of data fed back by the layer 2 feedback.

21. The method of any one of claims 16-20, wherein, The method further comprises: The second device sends first information to the first device; the first information is used to indicate the target feedback mode.

22. The method of claim 21, wherein: The target feedback mode is determined based on at least one of: a type of the first data, a composition of the first data, a priority of the first data, a transmission latency requirement of the first data, a transmission block error rate requirement of the first data, a transmission reliability requirement of the first data, network load.

23. The method of any one of claims 16-22, wherein, The method further comprises: The second device sends second information to the first device; The second information is used to indicate that the layer 1 feedback or the layer 2 feedback is used for the current transmission or retransmission of the first data, or the second information is used to indicate that the layer 1 feedback or the layer 2 feedback is used for the kth retransmission of the first data, or the second information is used to indicate a feedback mode used for the subsequent s retransmissions of the first data. Both k and s are positive integers.

24. The method of any one of claims 16-23, characterized in that, during handover of the first device from a first cell to a second cell, the related configuration of the layer 2 feedback is delivered by the first cell to the second cell through a handover request.

25. The method of any one of claims 16-24, characterized in that, during handover of the first device from a first cell to a second cell, the method further comprises: the second device sending second configuration information to the first device; wherein the second configuration information comprises at least one of the following: first indication information used to indicate whether the layer 2 feedback is activated in the second cell; a subject of the layer 2 feedback in the second cell; feedback parameters of the layer 2 feedback in the second cell; a modulation and coding mode of the layer 2 feedback in the second cell; CRC information of the layer 2 feedback in the second cell; repetition information of the layer 2 feedback in the second cell; HARQ feedback information of the layer 2 feedback in the second cell; HARQ retransmission information of the layer 2 feedback in the second cell.

26. The method of any one of claims 16-25, wherein, The method further comprises: the second device receiving capability information from the first device; wherein the capability information comprises at least one of the following: second indication information used to indicate that the first device supports the layer 2 feedback; third indication information used to indicate that the first device supports a first feature, wherein a device supporting the first feature is a first type of device, and the first type of device supports the layer 2 feedback.

27. A wireless communication device, comprising: comprises: a receiving module configured to receive first data from a second device; a sending module configured to perform receiving feedback for the first data using a target feedback mode; wherein the target feedback mode comprises one of the following: layer 2 feedback, a feedback mode selected from layer 1 feedback and layer 2 feedback, layer 1 feedback, and layer 2 feedback.

28. The apparatus of claim 27, characterized in that, the layer 2 feedback comprises feedback for a hybrid automatic repeat request (HARQ) process based on a medium access control (MAC) control element (CE); and / or the layer 1 feedback comprises at least one of the following: feedback based on a physical uplink control channel (PUCCH), and feedback based on a physical sidelink control channel (PSCCH).

29. The apparatus of claim 27 or 28, characterized in that, the receiving module is further configured to receive first configuration information from the second device; wherein the first configuration information comprises related configuration of the layer 2 feedback; wherein the related configuration of the layer 2 feedback comprises at least one of the following: a subject of the layer 2 feedback; feedback parameters of the layer 2 feedback; a modulation and coding scheme of the layer 2 feedback; a cyclic redundancy check (CRC) information of the layer 2 feedback; repetition information of the layer 2 feedback; HARQ feedback information of the layer 2 feedback; HARQ retransmission information of the layer 2 feedback.

30. The apparatus of any one of claims 27-29, wherein, The wireless communication device further includes a processing module. The receiving module is further configured to receive first information from the second device, wherein the first information is used to indicate the target feedback mode; or The processing module is configured to determine the target feedback mode based on protocol agreement information.

31. The apparatus of claim 30, wherein The target feedback mode is determined based on at least one of a type of the first data, a composition of the first data, a priority of the first data, a transmission delay requirement of the first data, a transmission block error rate requirement of the first data, a transmission reliability requirement of the first data, or a network load.

32. The apparatus of any of claims 27-31, wherein The receiving module is further configured to receive second information from the second device. The second information is used to indicate that the layer 1 feedback or the layer 2 feedback is used for a current transmission or retransmission of the first data, or the second information is used to indicate that the layer 1 feedback or the layer 2 feedback is used for a kth retransmission of the first data, or the second information is used to indicate a feedback mode used for a subsequent s retransmission of the first data. k and s are positive integers.

33. The apparatus of any of claims 27-32, wherein The wireless communication device further includes a processing module. In a case where the feedback mode is changed, if there is an unexecuted HARQ process, the sending module is further configured to perform receiving feedback corresponding to the unexecuted HARQ process according to the feedback mode before the change until the unexecuted HARQ process ends; and / or, in a case where the feedback mode is changed, if there is an unexecuted HARQ process, after the unexecuted HARQ process ends, the sending module is further configured to perform receiving feedback corresponding to a subsequent HARQ process according to the feedback mode after the change; and / or In a case where the feedback parameter is changed, if there is an unexecuted HARQ process, the sending module is further configured to determine, based on the changed feedback parameter, whether to perform receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter before the change or according to the feedback parameter after the change; and / or In a case where the feedback parameter is reconfigured, the processing module is configured to perform a medium access control (MAC) entity reset, and the sending module is further configured to perform receiving feedback based on the reconfigured feedback parameter.

34. The apparatus of any of claims 27-33, wherein In a handover process of the wireless communication device from a first cell to a second cell, the receiving module is further configured to receive second configuration information from the first cell or the second cell; wherein the second configuration information comprises at least one of the following: first indication information indicating whether the layer 2 feedback is activated in the second cell; a subject of the layer 2 feedback in the second cell; feedback parameters of the layer 2 feedback in the second cell; a modulation and coding mode of the layer 2 feedback in the second cell; CRC information of the layer 2 feedback in the second cell; repetition information of the layer 2 feedback in the second cell; HARQ feedback information of the layer 2 feedback in the second cell; HARQ retransmission information of the layer 2 feedback in the second cell.

35. The apparatus of any one of claims 27-34, wherein, in a handover process of the wireless communication device from a first cell to a second cell, the wireless communication device further comprises a processing module; if feedback parameters of the first cell are reconfigured, the processing module is configured to perform a MAC entity reset.

36. A wireless communication device, comprising: comprises: a sending module configured to send first data to a first device; a receiving module configured to receive, from the first device, receiving feedback performed by the first device on the first data using a target feedback mode; wherein the target feedback mode comprises one of the following: layer 2 feedback, layer 1 feedback, a feedback mode selected from layer 1 feedback and layer 2 feedback, and layer 1 feedback and layer 2 feedback.

37. The apparatus of claim 36, wherein, the sending module is further configured to send first configuration information to the first device; wherein the first configuration information comprises related configurations of the layer 2 feedback; wherein the related configurations of the layer 2 feedback comprise at least one of the following: a subject of the layer 2 feedback; feedback parameters of the layer 2 feedback; a modulation and coding mode of the layer 2 feedback; CRC information of the layer 2 feedback; repetition information of the layer 2 feedback; HARQ feedback information of the layer 2 feedback; HARQ retransmission information of the layer 2 feedback.

38. The apparatus of claim 36 or 37, wherein, the sending module is further configured to send first information to the first device; wherein the first information is used to indicate the target feedback mode.

39. The apparatus of claim 38, wherein, the target feedback mode is determined based on at least one of the following: a type of the first data, a composition of the first data, a priority of the first data, a transmission delay requirement of the first data, a transmission block error rate requirement of the first data, a transmission reliability requirement of the first data, and network load.

40. The apparatus of any one of claims 36-39, wherein, the sending module is further configured to send second information to the first device; The second information is used to indicate that the layer 1 feedback or the layer 2 feedback is used for the current transmission or retransmission of the first data, or the second information is used to indicate that the layer 1 feedback or the layer 2 feedback is used for the kth retransmission of the first data, or the second information is used to indicate a feedback mode used for the subsequent s retransmissions of the first data. Both k and s are positive integers.

41. The apparatus of any one of claims 36-40, wherein, In a process in which the first device switches from a first cell to a second cell, the sending module is further configured to send second configuration information to the first device. The second configuration information includes at least one of the following: first indication information used to indicate whether the layer 2 feedback is activated in the second cell; a subject of the layer 2 feedback in the second cell; feedback parameters of the layer 2 feedback in the second cell; a modulation and coding mode of the layer 2 feedback in the second cell; CRC information of the layer 2 feedback in the second cell; repetition information of the layer 2 feedback in the second cell; HARQ feedback information of the layer 2 feedback in the second cell; HARQ retransmission information of the layer 2 feedback in the second cell.

42. A first device, comprising: A processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the wireless communication method according to any one of claims 1-15.

43. A second device, comprising: A processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the wireless communication method according to any one of claims 16-26.

44. A readable storage medium, characterized by, The readable storage medium stores programs or instructions, and the programs or instructions are executed by the processor to implement the wireless communication method according to any one of claims 1-15, or to implement the steps of the wireless communication method according to any one of claims 16-26.

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