Wireless communication method, apparatus and device

Abstract

The present application belongs to the field of communications. Disclosed .are a wireless communication method, an apparatus and a device. The wireless communication method of the embodiments of the present application comprises: a first device receives first data from a second device; and the first device uses a target feedback mode to implement reception feedback for the first data, 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, and layer 1 feedback and layer 2 feedback.

Description

Wireless communication methods, apparatus, and devices

[0001] Cross Reference to Related Applications

[0002] This application claims priority to the Chinese Patent Application No. 202411236407.4, filed on September 4, 2024, and entitled "Wireless communication methods, apparatus, and devices", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and particularly relates to a wireless communication method, apparatus and device. BACKGROUND

[0004] In a New Radio (NR) system, 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, and for a HARQ process, HARQ feedback can be performed by layer 1 (L1) (e.g., HARQ feedback is performed by sending a Physical Uplink Control Channel (PUCCH) by L1), and when the feedback is a HARQ Negative Acknowledgement (NACK), retransmission of the HARQ process is performed, further improving the reliability of transmission. In the RLC Acknowledged Mode (AM), the receiving status feedback (e.g., feedback of an RLC Automatic Repeat reQuest (ARQ) status report) can be performed based on a receiving detection mechanism of a receiving end (e.g., a feedback receiving end) or a polling mechanism of a sending end (e.g., a feedback sending end), and for a Radio Link Control Protocol Data Unit (RLC PDU) or an RLC PDU segment with a NACK in the status feedback, the RLC sending end can start retransmission, further improving the reliability of transmission. In addition, in order to improve the reliability of transmission and the latency performance (e.g., reduce the transmission latency) at the same time, a Packet Data Convergence Protocol (PDCP) duplication transmission mechanism is introduced, such as each Packet Data Convergence Protocol Protocol Data Unit (PDCP PDU) is duplicated to obtain two or more data packets, and the two or more data packets are transmitted through two or more different paths, consuming twice or more resources to ensure the reliability and latency performance of important data. However, the resource consumption of the PDCP duplication transmission mechanism is very large, and the cost is high.

[0005] Specifically, the feedback of the MAC layer can be understood as L1 feedback, and there is a feedback mischeck, for example, a HARQ acknowledgement (ACK) is mischecked as a HARQ negative acknowledgement (NACK), or a HARQ NACK is mischecked as a HARQ ACK, thereby affecting the transmission result and reliability. The feedback and retransmission triggering mechanism of the RLC layer is complex and is affected by timer settings and transmission scheduling, and will have a delay of, for example, tens of milliseconds. The PDCP duplication mechanism has a relatively high resource overhead.

[0006] Therefore, how to improve the feedback performance of data transmission is a problem to be solved. SUMMARY

[0007] Embodiments of the present application provide a wireless communication method, device and equipment, which can solve the problem of poor feedback performance of data transmission.

[0008] In a first aspect, a wireless communication method is provided, comprising:

[0009] The first device receives first data from a second device;

[0010] The first device performs receiving feedback for the first data using a target feedback mode;

[0011] The target feedback mode includes 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.

[0012] In a second aspect, a wireless communication method is provided, comprising:

[0013] The second device sends first data to a first device;

[0014] The second device receives receiving feedback for the first data performed by the first device using a target feedback mode from the first device;

[0015] The target feedback mode includes 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.

[0016] In a third aspect, a wireless communication device is provided, comprising:

[0017] The receiving module is configured to receive first data from a second device;

[0018] The sending module is configured to perform receiving feedback for the first data using a target feedback mode;

[0019] The target feedback mode includes one of the following: layer 2 feedback, layer 1 feedback, a feedback mode selected from the layer 1 feedback and the layer 2 feedback, and the layer 1 feedback and the layer 2 feedback.

[0020] In a fourth aspect, a wireless communication apparatus is provided, comprising:

[0021] The sending module is configured to send first data to a first device.

[0022] The receiving module is configured to receive, from the first device, receiving feedback performed by the first device on the first data using a target feedback mode.

[0023] The target feedback mode includes one of the following: layer 2 feedback, layer 1 feedback, a feedback mode selected from the layer 1 feedback and the layer 2 feedback, and the layer 1 feedback and the layer 2 feedback.

[0024] In a fifth aspect, a wireless communication apparatus is provided, which is configured to perform the steps of the method of the first aspect, or implement the steps of the method of the second aspect.

[0025] In a sixth aspect, a first device is provided, which comprises a processor and a memory storing programs or instructions executable on the processor, and the programs or instructions, when executed by the processor, implement the steps of the method of the first aspect.

[0026] In a seventh aspect, a first device is provided, which comprises a processor and a communication interface.

[0027] The communication interface is configured to receive first data from a second device.

[0028] The communication interface is further configured to perform receiving feedback on the first data using a target feedback mode.

[0029] The target feedback mode includes one of the following: layer 2 feedback, layer 1 feedback, a feedback mode selected from the layer 1 feedback and the layer 2 feedback, and the layer 1 feedback and the layer 2 feedback.

[0030] In an eighth aspect, a second device is provided, which comprises a processor and a memory storing programs or instructions executable on the processor, and the programs or instructions, when executed by the processor, implement the steps of the method of the second aspect.

[0031] In a ninth aspect, a second device is provided, which comprises a processor and a communication interface.

[0032] The communication interface is configured to send first data to a first device.

[0033] The communication interface is further configured to receive, from the first device, receiving feedback of the first device for the first data using a target feedback mode.

[0034] 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.

[0035] In a tenth aspect, a readable storage medium is provided, and the readable storage medium stores a program or instructions, which, when executed by a processor, implement steps of the method according to the first aspect or implement steps of the method according to the second aspect.

[0036] In an eleventh aspect, a wireless communication system is provided, and the wireless communication system comprises a first device and a second device, the first device is configured to implement steps of the method according to the first aspect, and the second device is configured to implement steps of the method according to the second aspect.

[0037] In a twelfth aspect, a chip is provided, and the chip comprises a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or instructions to implement the method according to the first aspect or implement the method according to the second aspect.

[0038] In a thirteenth aspect, a computer program / program product is provided, and the computer program / program product is stored in a storage medium, and the computer program / program product is executed by at least one processor to implement steps of the wireless communication method according to the first aspect or implement steps of the wireless communication method according to the second aspect.

[0039] In the embodiments of the present application, the first device receives first data from the second device, and the first device performs receiving feedback for the first data using a target feedback mode. 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. In the embodiments of the present application, the layer 2 feedback has the advantages of high reliability, small time delay and low block error rate. Specifically, the first device performs receiving feedback for the first data using the layer 2 feedback, which can improve the reliability of the receiving feedback for the first data and reduce the time delay of the receiving feedback for the first data. Alternatively, the first device performs receiving feedback for the first data using a feedback mode selected from the layer 1 feedback and the layer 2 feedback. The first device can select a suitable feedback mode from the layer 1 feedback and the layer 2 feedback based on actual needs, which increases the flexibility of the receiving feedback for the first data in implementation and can improve the feedback performance of the first data. Alternatively, the first device performs receiving feedback for the first data using the layer 1 feedback and the layer 2 feedback. By comprehensively considering the results of the layer 1 feedback and the layer 2 feedback, the reliability of the receiving feedback for the first data can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] FIG. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application.

[0041] FIG. 2 is a schematic diagram of a user plane protocol stack according to an embodiment of the present application.

[0042] FIG. 3 is a schematic diagram of an uplink L2 architecture according to an embodiment of the present application.

[0043] FIG. 4 is a schematic flowchart of a wireless communication method according to an embodiment of the present application.

[0044] FIG. 5 is a schematic diagram of layer 2 feedback according to an embodiment of the present application.

[0045] FIG. 6 is a schematic diagram of using layer 2 feedback in data retransmission according to an embodiment of the present application.

[0046] FIG. 7 is a schematic diagram of uplink transmission according to an embodiment of the present application.

[0047] FIG. 8 is a schematic block diagram of a wireless communication device according to an embodiment of the present application.

[0048] FIG. 9 is a schematic block diagram of another wireless communication device according to an embodiment of the present application.

[0049] FIG. 10 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0050] FIG. 11 is a schematic diagram of a hardware structure of a terminal according to an embodiment of the present application.

[0051] FIG. 12 is a schematic block diagram of a network side device according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0053] 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.

[0054] 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.

[0055] It is worth noting that the technology described in the embodiments of the present application is 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 the embodiments of the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th Generation (6G) communication systems. th

[0056] Figure 1 shows a block diagram of a wireless communication system to which the embodiments of the present application can be applied. Specifically, the wireless communication system includes a terminal 11 and a network side device 12.

[0057] ​The terminal 11 can be a terminal-side device such as a mobile phone, a Tablet Personal Computer, a Laptop Computer, a notebook computer, a Personal Digital Assistant (PDA), a palm computer, a netbook, an Ultra-mobile Personal Computer (UMPC), a Mobile Internet Device (MID), an Augmented Reality (AR) device, a Virtual Reality (VR) device, a robot, a wearable device, a flight vehicle, a Vehicle User Equipment (VUE), a shipboard device, a Pedestrian User Equipment (PUE), a smart home device (a home device with a wireless communication function, such as a refrigerator, a television, a washing machine, or furniture), a game console, a Personal Computer (PC), a teller machine, or a self-service machine. The wearable device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, etc.), a smart wristband, smart clothing, and the like. The vehicle-mounted device can also be referred to as a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application.

[0058] The network-side device 12 can include an access network device or a core network device.

[0059] Optionally, the access network device can also be referred to as a radio access network (RAN) device, a radio access network function or a radio access network unit. The access network device can include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc. Among them, the base station can be referred to as a node B (NB), an evolved node B (eNB), a next generation node B (gNB), a new radio node B (NR node B), an access point, a relay base station (RBS), a serving base station (SBS), a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home node B (HNB), a home evolved node B, a transmit / receive point (TRP), or some other suitable term in the art, as long as the same technical effect is achieved. The base station is not limited to a specific technical term, and it should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0060] Optionally, the core network device can also be referred to as a core network node, a core network function, or a core network network element, etc., which includes but is not limited to at least one of the following: a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (L-NEF), a binding support function (BSF), an application function (AF), a location management function (LMF), a gateway mobile location center (GMLC), a network data analytics function (NWDAF), etc. It should be noted that only the core network device in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the core network device is not limited. If the name of the core network device mentioned in the embodiments of the present application changes in the subsequent protocol version (for example, 6G), it is also within the protection scope of the present application.

[0061] Optionally, the core network device can be implemented by one or more function modules in one device, or can be implemented by multiple devices together, and the embodiments of the present application do not make a specific limitation in this regard. It can be understood that the above function modules can be network elements in a hardware device, can be software function modules running on a dedicated hardware, or can be virtualized function modules instantiated on a platform (for example, a cloud platform).

[0062] In order to better understand the technical solutions of the present application, the data processing of the user plane related to the present application is described.

[0063] In the NR system, as shown in FIG. 2, 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 (physical, PHY).

[0064] As shown in FIG. 2, in addition to the PHY being a layer 1 (L1) protocol stack, the remaining four layers of protocols constitute a layer 2 (L2) protocol stack, that is, the MAC layer protocol, the RLC layer protocol, the PDCP layer protocol and the SDAP layer protocol constitute the L2 protocol stack. Among them, the MAC layer is mainly responsible for: mapping between logical channels and transport channels, logical channel priority processing, multiplexing and demultiplexing of Media Access Control Service Data Units (MAC SDUs), scheduling and Hybrid Automatic Repeat reQuest (HARQ) operations, etc. Among them, the RLC layer provides the following functions: data transmission in three modes of Transparent Mode (TM), Unacknowledged Mode (UM) and Acknowledged Mode (AM), segmentation and reassembly, Automatic Repeat reQuest (ARQ), independent sequence number, etc. Among them, the PDCP layer provides header compression and decompression, security operation, split bearer routing and duplication, etc. The SDAP layer provides Quality of Service (QoS) flow to radio bearer mapping, marks QoS flow ID (QFI) for uplink and downlink data packets, etc.

[0065] Exemplarily, the uplink L2 architecture can be as shown in FIG. 3.

[0066] Generally, both the MAC layer and the RLC layer can provide data transmission feedback and retransmission mechanisms. The MAC layer has a HARQ function, and HARQ feedback can be performed through L1 (e.g., HARQ feedback is performed through L1 to send a PUCCH), retransmission of the HARQ process is performed when the feedback is a HARQ NACK, and the reliability of transmission is further improved. The feedback of the MAC layer can be understood as L1 feedback. In addition, in the RLC AM mode, the receiving status feedback (e.g., feedback of an RLC ARQ status report) can be performed based on a receiving detection mechanism of a receiving end (e.g., a feedback receiving end) or a polling mechanism of a sending end (e.g., a feedback sending end), and the RLC sending end can start retransmission for the NACK RLC PDU or RLC PDU segment in the status feedback, thereby further improving the transmission reliability.

[0067] On the other hand, in order to improve the transmission reliability and the latency performance (e.g., reduce the transmission latency) at the same time, a PDCP duplication transmission mechanism is introduced, e.g., each PDCP PDU adopts a duplication manner to obtain two or more data packets, and the two or more data packets are transmitted through two or more different paths, thereby consuming two times or more resources to ensure the reliability and the latency performance of important data. However, the resource consumption of the PDCP duplication transmission mechanism is very large, and the cost is high.

[0068] Specifically, the MAC layer has a HARQ feedback and retransmission mechanism, and the RLC AM mode also has an ARQ status report and retransmission function. However, the feedback and retransmission of the MAC layer are fast, but there are feedback misjudgment cases, e.g., a HARQ ACK is misjudged as a HARQ NACK, or a HARQ NACK is misjudged as a HARQ ACK, thereby affecting the transmission result and the reliability. On the other hand, the feedback and retransmission of the RLC layer are highly reliable, but due to the complex triggering mechanism of the feedback and retransmission of the RLC layer, the feedback and retransmission of the RLC layer are affected by timer settings and transmission scheduling, and will have a delay of, e.g., tens of milliseconds.

[0069] For services with high reliability requirements and high latency requirements at the same time, e.g., a service with a latency requirement of no less than 10 -6The block error rate is low, and the transmission delay is less than 10ms-20ms. For such services, it is not easy to achieve by using only traditional HARQ and ARQ cooperation, and if the PDCP duplication mechanism is started, there will be higher resource consumption and cost.

[0070] The wireless communication method provided by the embodiments of the present application will be described in detail below in combination with the accompanying drawings, some embodiments and application scenarios.

[0071] FIG. 4 is a schematic flowchart of a wireless communication method 200 according to an embodiment of the present application. As shown in FIG. 4, the wireless communication method 200 can include at least part of the following contents:

[0072] S210, the second device sends first data to the first device;

[0073] S220, the first device receives the first data from the second device;

[0074] S230, the first device performs receiving feedback for the first data using a target feedback mode;

[0075] The target feedback mode includes 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.

[0076] S240, the second device receives the receiving feedback for the first data performed by the first device using the target feedback mode from the first device.

[0077] It should be understood that FIG. 4 shows steps or operations of the wireless communication method 200, but these steps or operations are only examples, and the present application can also perform other operations or variations of each operation in FIG. 4.

[0078] In some embodiments, the layer 2 feedback includes but is not limited to feedback for a HARQ process based on a media access control layer control element (MAC CE).

[0079] In some embodiments, the layer 1 feedback includes but is not limited to at least one of the following: feedback based on a physical uplink control channel (PUCCH), feedback based on a physical sidelink control channel (PSCCH).

[0080] In the embodiments of the present application, the layer 2 feedback has the advantages of high reliability, small delay and low block error rate. Specifically, the layer 2 feedback can be timely feedback for a HARQ process sent through a MAC CE, or the layer 2 feedback can be timely feedback for a MAC PDU sent through a MAC CE. The association between the sending position of the MAC CE and the sending position of the data fed back by the MAC CE can be dynamically indicated by scheduling signaling or semi-statically configured by RRC signaling. Further, the MAC CE can carry CRC check and perform encoding and modulation, link adaptive transmission, and the like, so the reliability of the layer 2 feedback is greatly improved compared with the PUCCH feedback or the layer 1 feedback. The layer 2 feedback is immediately fed back after the MAC PDU is sent, and the processing delay can be only a few milliseconds. Compared with the tens or even hundreds of milliseconds of delay of the RLC feedback, the layer 2 feedback has better performance in terms of delay characteristics.

[0081] Specifically, the first device performs the receiving feedback for the first data using the layer 2 feedback, which can improve the reliability of the receiving feedback for the first data and reduce the delay of the receiving feedback for the first data. Alternatively, the first device performs the receiving feedback for the first data using one of the layer 1 feedback and the layer 2 feedback. The first device can select a suitable feedback mode from the layer 1 feedback and the layer 2 feedback based on actual needs, which increases the flexibility of the receiving feedback for the first data in implementation and can improve the feedback performance of the first data. Alternatively, the first device performs the receiving feedback for the first data using the layer 1 feedback and the layer 2 feedback. By comprehensively considering the results of the layer 1 feedback and the layer 2 feedback, the reliability of the receiving feedback for the first data can be improved.

[0082] In some embodiments, the first device can be a terminal, and the second device can be a network side device; or the first device can be a network side device, and the second device can be a terminal; or the first device can be a first terminal, and the second device can be a second terminal.

[0083] The embodiments of the present application introduce two feedback mechanisms for HARQ feedback, one is L1 feedback (such as PUCCH-based feedback or PSCCH-based feedback), and the other is L2 feedback (such as feedback for HARQ processes implemented based on MAC CE). Among them, the network side device gives the association relationship between the MAC CE feedback and the MAC layer transmission corresponding to the MAC CE feedback when scheduling the feedback for HARQ processes implemented based on MAC CE; or the network side device gives the association relationship between the MAC CE feedback and the MAC layer transmission corresponding to the MAC CE feedback when configuring the feedback for HARQ processes implemented based on MAC CE through semi-static signaling. For example, the time domain and / or frequency domain relationship between the MAC CE feedback and the MAC layer transmission corresponding to the MAC CE feedback. In the embodiments of the present application, the feedback for HARQ processes implemented based on MAC CE can also have a HARQ process identifier (HARQ process ID), and has a HARQ feedback mechanism and / or a HARQ retransmission mechanism.

[0084] In the embodiments of the present application, layer 1 feedback (such as PUCCH-based feedback or PSCCH-based feedback) and / or layer 2 feedback (such as feedback for HARQ processes implemented based on MAC CE) can be configured on demand.

[0085] Exemplarily, in the case where the layer 2 feedback is configured, the first device performs the receiving feedback for the first data using the layer 2 feedback, which can improve the reliability of the receiving feedback for the first data and reduce the time delay of the receiving feedback for the first data, ensures the processing complexity of the receiving end and the sending end, and improves the efficiency of the overall system resources, further improves the user experience and the service quality of the business on the basis of ensuring the system efficiency.

[0086] Exemplarily, in the case where the layer 1 feedback and the layer 2 feedback are configured at the same time, the first device performs the receiving feedback for the first data using a feedback mode selected from the layer 1 feedback and the layer 2 feedback, the first device can select a suitable feedback mode from the layer 1 feedback and the layer 2 feedback based on actual needs, increases the flexibility of the receiving feedback for the first data in implementation, and can also improve the feedback performance of the first data, ensures the processing complexity of the receiving end and the sending end, and improves the efficiency of the overall system resources, further improves the user experience and the service quality of the business on the basis of ensuring the system efficiency.

[0087] Exemplarily, in the case that the layer 1 feedback and the layer 2 feedback are configured simultaneously, the first device performs the receiving feedback for the first data using the layer 1 feedback and the layer 2 feedback, and the reliability of the receiving feedback for the first data can be improved by comprehensively considering the result of the layer 1 feedback and the result of the layer 2 feedback, which not only ensures the processing complexity of the receiving end and the sending end but also improves the efficiency of the overall system resources, and on the basis of ensuring the system efficiency, the user experience and the service quality are further improved.

[0088] It should be noted that, since the layer 1 feedback and the layer 2 feedback are generally configured on different frequency domain resources and / or time domain resources, the layer 1 feedback and the layer 2 feedback can also be simultaneously started for a transmission or retransmission. For the first device, feedback is performed according to the feedback mode indicated by the second device, if the layer 1 feedback and the layer 2 feedback are simultaneously started, feedback is performed once on the resource position of the layer 1 feedback, and then feedback is performed once on the resource position of the layer 2 feedback, so that the second device comprehensively considers the result of the layer 1 feedback and the result of the layer 2 feedback to form the final feedback result. For example, when the CRC check of the layer 2 feedback is correct, the layer 2 feedback is taken as the reference; only when the CRC check of the layer 2 feedback fails, the feedback result of the layer 1 feedback is additionally considered.

[0089] The receiving end described in the embodiments of the present application can be a feedback information receiving end, and the sending end described in the embodiments of the present application can be a feedback information sending end.

[0090] Exemplarily, taking the first device as a terminal, the second device as a network side device, and the first data as downlink data as an example, when the terminal is configured with a layer 2 feedback mechanism for downlink data, the terminal will send the receiving feedback for the first data at the position of the layer 2 feedback indicated by the network side according to whether the first data decoding is correct. Correspondingly, the network side decides whether to perform retransmission on the first data according to the receiving feedback for the first data. In the network, when some terminals are configured with a layer 2 feedback mechanism for downlink data transmission and some terminals are configured with a layer 1 feedback mechanism for downlink data transmission, the terminals can independently work according to the respective configurations, and the network side device and the terminals can communicate and feedback according to the configurations and indications.

[0091] In some embodiments, the wireless communication method 200 further includes:

[0092] The first device receives first configuration information from the second device;

[0093] The first configuration information includes the related configuration of the layer 2 feedback.

[0094] The related configuration of the layer 2 feedback includes but is not limited to at least one of the following:

[0095] a subject to which the layer 2 feedback is applicable;

[0096] a feedback parameter of the layer 2 feedback;

[0097] a modulation and coding scheme of the layer 2 feedback;

[0098] a CRC (Cyclical Redundancy Check) information of the layer 2 feedback;

[0099] repetition information of the layer 2 feedback;

[0100] HARQ feedback information of the layer 2 feedback;

[0101] HARQ retransmission information of the layer 2 feedback.

[0102] In this embodiment, the first device can receive, from the second device, a related configuration of the layer 2 feedback, and then obtain at least one of the following: a subject to which the layer 2 feedback is applicable, a feedback parameter of the layer 2 feedback, a modulation and coding scheme 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, and HARQ retransmission information of the layer 2 feedback. Thus, the first device can perform the layer 2 feedback based on the related configuration of the layer 2 feedback.

[0103] For example, the first device is a terminal, and the second device is a network side device. For a UE with a layer 2 feedback capability, the network side device can comprehensively determine a layer 2 feedback mechanism for the UE according to UE capability, UE service information, current network status information, base station side algorithm information, and other factors. Since the layer 2 feedback has a larger feedback overhead and higher reliability than the layer 1 feedback, the layer 2 feedback can be preferentially configured for services with higher requirements for block error rate, reliability, and delay. In terms of network status, the network can more easily support the layer 2 feedback when the network load is lighter.

[0104] In some embodiments, the first configuration information can further include a related configuration of the layer 1 feedback, which is not limited in the embodiments of the present application.

[0105] In some embodiments, the subject to which the layer 2 feedback is applicable includes, but is not limited to, at least one of the following:

[0106] 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.

[0107] For example, the configuration of the layer 2 feedback is a per-UE configuration, and in this case, the layer 2 feedback is applicable to all services of the first device (e.g., a terminal). For example, once the configuration of the layer 2 feedback is configured, all services of the first device (e.g., a terminal) perform the layer 2 feedback; otherwise (i.e., the configuration of the layer 2 feedback is not configured), all services of the first device (e.g., a terminal) do not support the layer 2 feedback, and in this case, the HARQ feedback uses the layer 1 feedback.

[0108] For example, the downlink service supports the layer 2 feedback, the uplink service does not support the layer 2 feedback; or the downlink service supports the layer 2 feedback, the sidelink service supports the layer 2 feedback, and the uplink service does not support the layer 2 feedback; or the sidelink service supports the layer 2 feedback, and the uplink service and the downlink service do not support the layer 2 feedback; or the downlink service supports the layer 2 feedback, and the uplink service and the sidelink service do not support the layer 2 feedback; or the downlink service supports the layer 2 feedback, the uplink service supports the layer 2 feedback, and the sidelink service supports the layer 2 feedback; or the downlink service does not support the layer 2 feedback, the uplink service does not support the layer 2 feedback, and the sidelink service does not support the layer 2 feedback. For the service that does not support the layer 2 feedback, the layer 1 feedback is used.

[0109] In some embodiments, the specific service includes but is not limited to at least one of the following:

[0110] Downlink signaling radio bearers (SRBs), downlink data radio bearers (DRBs) (e.g., DRB 2), downlink MAC CEs, sidelink SRBs, sidelink DRBs, and sidelink MAC CEs.

[0111] Specifically, the specific service uses the layer 2 feedback, and the service other than the specific service uses the layer 1 feedback.

[0112] In some embodiments, the specific MAC CE includes but is not limited to at least one of the following:

[0113] The MAC CE carrying the copy transmission activation indication, the MAC CE carrying the copy transmission deactivation indication, the MAC CE carrying the secondary cell (SCell) activation indication, the MAC CE carrying the SCell deactivation indication, and the MAC CE carrying the discontinuous reception (DRX) command.

[0114] Specifically, the specific MAC CE uses the layer 2 feedback, and the MAC CE other than the specific MAC CE uses the layer 1 feedback.

[0115] In some embodiments, the feedback parameter of the layer 2 feedback comprises, but is not limited to, at least one of the following: size of feedback resource, feedback content, modulation and coding scheme, CRC bit number, time domain offset, frequency domain offset;

[0116] The feedback content comprises one of the following:

[0117] NACK or ACK, NACK only, ACK only;

[0118] 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.

[0119] 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.

[0120] It should be noted that, since the MAC CE has higher detectability than the PUCCH, the ACK only or NACK only feedback can be simply performed. Specifically, only in the case of correct reception, the layer 2 feedback (such as ACK) is sent, or only in the case of incorrect reception, the layer 2 feedback (such as NACK) is sent. In this way, the receiving side can determine whether there is layer 2 feedback by detecting the receiving level, so as to determine ACK or NACK. For example, NACK only means that there is only a small probability, about 10%, of sending feedback, so that the interference of the feedback resource on other transmissions can be reduced, and the detection success rate is further improved.

[0121] In the embodiment, the feedback parameter of the layer 2 feedback can further reduce the overhead of the layer 2 feedback. If the feedback parameter of the layer 2 feedback is semi-statically configured by the RRC professional signaling, the overhead of dynamically indicating the feedback parameter of the layer 2 feedback can be saved. Optionally, some of the feedback parameters of the layer 2 feedback are indicated in the semi-static configuration, and a small number of the feedback parameters of the layer 2 feedback are dynamically indicated (for example, the dynamic indication is carried in the physical downlink control channel (PDCCH) scheduling the downlink media access control protocol data unit (MAC PDU)). For example, the time domain offset can be dynamically carried in the feedback parameter of the layer 2 feedback. For example, the position of n slots or n symbols after the end of the downlink MAC PDU or the PDCCH is the time domain position of the layer 2 feedback, and the value of n is dynamically carried by the PDCCH. In this way, the time domain resource position of the layer 2 feedback reserved between different devices can be more flexibly coordinated, and the resource utilization efficiency is improved.

[0122] In this embodiment, compared with layer 1 feedback, layer 2 feedback can be adjusted in modulation and coding mode (for example, modulation and coding mode of layer 2 feedback is adjusted based on link quality), layer 2 feedback can carry CRC check, layer 2 feedback can be repeated, layer 2 feedback can be HARQ feedback and HARQ retransmission, because layer 2 feedback for downlink data is an uplink MAC transmission itself. If the HARQ retransmission mechanism is enabled, the retransmission resource of the HARQ process scheduled by the network side is used for repeated transmission of layer 2 feedback itself, which can further improve the reliability of layer 2 feedback, so as to achieve fast and accurate feedback to data transmission, and improve the reliability and delay performance of data transmission.

[0123] In this embodiment, layer 2 feedback can have CRC check. In the case that the feedback content of layer 2 feedback is ACK or NACK, if the CRC check fails, it is considered that ACK->NACK or NACK->ACK error occurs, so direct correction is sufficient.

[0124] Specifically, before S210, the first device receives the first configuration information from the second device. 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.

[0125] 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 by at least one of the following:

[0126] Radio Resource Control (RRC) signaling, downlink control information (DCI), and downlink MAC CE.

[0127] 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:

[0128] PC5 message, sidelink control information (SCI), and sidelink MAC CE.

[0129] Optionally, the first device is a first terminal, and the second device is a second terminal. The first device can also receive the first configuration information from a network side device.

[0130] In some embodiments, the wireless communication method 200 further includes:

[0131] The first device receives first information from the second device.

[0132] The first information is used to indicate the target feedback mode.

[0133] In this embodiment, the first device can determine the target feedback mode based on the first information received from the second device, so that the first device can perform the receiving feedback for the first data using the target feedback mode.

[0134] For example, in the case that the data transmission of the first device supports both the layer 1 feedback mechanism and the layer 2 feedback mechanism, the first device receives the first information from the second device.

[0135] Specifically, before 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.

[0136] Optionally, the first device is a terminal, and the second device is a network side device. The first information can be carried by at least one of the following: RRC signaling, DCI, and downlink MAC CE.

[0137] Optionally, the first device is a network side device, and the second device is a terminal. The first information can be carried by at least one of the following: RRC signaling, UCI, and uplink MAC CE.

[0138] Optionally, the first device is a first terminal, and the second device is a second terminal. The first information can be carried by at least one of the following: PC5 message, SCI, and sidelink MAC CE.

[0139] Optionally, the first device is a first terminal, and the second device is a second terminal. The first device can also receive the first information from a network side device.

[0140] For example, taking the case that the first device is a terminal and the second device is a network side device as an example, the network side device explicitly carries the feedback mode of this transmission, such as one of the layer 2 feedback or the layer 1 feedback, in the downlink signaling, such as PDCCH. Then, the terminal performs feedback according to the feedback mode indicated by the network side device after receiving the data.

[0141] In some embodiments, the wireless communication method 200 further includes:

[0142] The first device determines the target feedback mode based on the protocol agreement information.

[0143] In this embodiment, the first device determines the target feedback mode based on the protocol agreement information, so that the first device can perform the receiving feedback for the first data using the target feedback mode.

[0144] For example, in the case that the data transmission of the first device supports both the layer 1 feedback mechanism and the layer 2 feedback mechanism, the first device determines the target feedback mode based on the protocol agreement information.

[0145] Specifically, before S210, the first device determines the target feedback mode based on the protocol agreement information.

[0146] In some embodiments, the target feedback mode 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 network load.

[0147] In this embodiment, the target feedback mode 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 block error rate requirement of the first data, the transmission reliability requirement of the first data, and network load. Thus, the accuracy of the receiving feedback for the first data can be improved.

[0148] For example, taking the first device as a terminal and the second device as a network side device as an example, the target feedback mode can be determined according to the network side configuration or the protocol agreement. For example, SRB 1 adopts layer 2 feedback, all downlink MAC CEs or part of important downlink MAC CEs with high delay and reliability requirements adopt layer 2 feedback, some data with high delay and reliability requirements adopt layer 2 feedback, DRB 1 adopts layer 2 feedback, and the like.

[0149] In some embodiments, the first information is associated with, or 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 network load.

[0150] In some embodiments, the protocol agreement information is associated with, or 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, network load.

[0151] In some embodiments, the first data is a MAC PDU.

[0152] 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 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,

[0153] 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 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 includes the layer 1 feedback.

[0154] For example, for downlink data, the network side organizes the data for transmission, and thus determines the feedback mode of the MAC PDU according to the type and composition of the data, and explicitly indicates the feedback mode to the terminal. For example, if the MAC PDU includes any data requiring MAC CE feedback, the entire MAC PDU adopts the MAC CE feedback mode, otherwise, the entire MAC PDU adopts the PUCCH feedback mode. For another example, according to the feedback type corresponding to the highest priority data in the MAC PDU, the feedback mode of the entire MAC PDU is directly determined.

[0155] In some embodiments, the wireless communication method 200 further includes:

[0156] The first device receives second information from the second device.

[0157] 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.

[0158] Both k and s are positive integers.

[0159] In the embodiment, the first device can learn, based on the second information, that the layer 1 feedback or the layer 2 feedback is used for the current transmission or retransmission of the first data, or the first device can learn, based on the second information, that the layer 1 feedback or the layer 2 feedback is used for the kth retransmission of the first data, or the first device can learn, based on the second information, a feedback mode used for the subsequent s retransmissions of the first data, so that the first device can perform receiving feedback for the first data.

[0160] Specifically, before S210, the first device receives the second information from the second device. For example, in the 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.

[0161] In some embodiments, if the feedback mode corresponding to the initial transmission of the first data is the layer 1 feedback, and the feedback mode corresponding to the retransmission of the first data is the layer 2 feedback. Specifically, when the link quality is poor, there will be retransmission, and then for the subsequent retransmission, the layer 2 feedback can be explicitly indicated or used by default to improve the correctness of the feedback and avoid NACK misjudgment as ACK, resulting in packet loss and transmission failure.

[0162] In some embodiments, 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 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. Specifically, when the link quality is poor, there will be multiple retransmissions, and then for the subsequent retransmission, the layer 2 feedback can be explicitly indicated or used by default to improve the correctness of the feedback and avoid NACK misjudgment as ACK, resulting in packet loss and transmission failure.

[0163] In some embodiments, for the initial transmission of the first data, the feedback mode corresponding to the initial transmission of the first data is determined to be the layer 1 feedback according to the service condition, and when the multiple transmissions of the first data are not successful, it is determined that the link is poor, so that the layer 2 feedback is changed subsequently to improve the correctness of the feedback.

[0164] In some embodiments, the wireless communication method 200 further includes:

[0165] In the case that the feedback mode is changed, if there is an unexecuted HARQ process, 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 ends; and / or, in the case that the feedback mode is changed, if there is an unexecuted HARQ process, after the unexecuted HARQ process ends, the first device performs the receiving feedback corresponding to the subsequent HARQ process according to the feedback mode after the change.

[0166] In the embodiment, in the case that the feedback mode is changed, if there is an unexecuted HARQ process, the effective time of the feedback mode after the change can be known.

[0167] In some embodiments, the wireless communication method 200 further includes:

[0168] In the case that the feedback parameter is changed, if there is an unexecuted HARQ process, the first device determines to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter before the change based on the changed feedback parameter, or the first device determines to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter after the change based on the changed feedback parameter.

[0169] In the embodiment, in the case that the feedback parameter is changed, if there is an unexecuted HARQ process, the effective time of the feedback parameter after the change can be known.

[0170] For example, in the case that the feedback content is changed, if there is an unexecuted HARQ process, the first device determines to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter (i.e. the feedback content) after the change based on the changed feedback parameter (i.e. the feedback content).

[0171] For example, in the case that the size of the feedback resource is changed, if there is an unexecuted HARQ process, the first device determines to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter (i.e. the size of the feedback resource) before the change based on the changed feedback parameter (i.e. the size of the feedback resource).

[0172] For example, in the case that the modulation and coding mode is changed, if there is an unexecuted HARQ process, the first device determines to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter (i.e. the modulation and coding mode) after the change based on the changed feedback parameter (i.e. the modulation and coding mode).

[0173] Exemplarily, in the case that the CRC bit number is changed, if there is an unexecuted HARQ process, the first device determines, based on the changed feedback parameter (i.e., the CRC bit number), to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter (i.e., the CRC bit number) before the change.

[0174] Exemplarily, in the case that the time domain offset is changed, if there is an unexecuted HARQ process, the first device determines, based on the changed feedback parameter (i.e., the time domain offset), to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter (i.e., the time domain offset) before the change.

[0175] Exemplarily, in the case that the frequency domain offset is changed, if there is an unexecuted HARQ process, the first device determines, based on the changed feedback parameter (i.e., the frequency domain offset), to perform the receiving feedback corresponding to the unexecuted HARQ process according to the feedback parameter (i.e., the frequency domain offset) before the change.

[0176] In some embodiments, the wireless communication method 200 further includes:

[0177] In the case that the feedback parameter is reconfigured, the first device performs a MAC entity reset, and the first device performs the receiving feedback based on the reconfigured feedback parameter.

[0178] In the present embodiment, in the case that the feedback parameter is 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 the timing of the taking effect of the reconfigured feedback parameter.

[0179] In some embodiments, in the process that the first device switches from the first cell to the second cell, the related configuration of the layer 2 feedback is delivered by the first cell to the second cell through a handover request.

[0180] In the present embodiment, in the process that the first device switches from the first cell to the second cell, the related configuration of the layer 2 feedback is delivered by the first cell to the second cell, so that the second cell can configure the new related configuration of the layer 2 feedback for the first device based on the related configuration of the layer 2 feedback obtained from the first cell.

[0181] The first cell described in the embodiments of the present application can also be referred to as a source cell, and the second cell described in the embodiments of the present application can also be referred to as a target cell.

[0182] In some embodiments, in the process that the first device switches from the first cell to the second cell, the wireless communication method 200 further includes:

[0183] The first device receives second configuration information from the first cell or the second cell; or

[0184] The first device receives second configuration information from the second device, wherein the second device is a gNB of the first cell or a gNB of the second cell;

[0185] The second configuration information includes but is not limited to at least one of the following:

[0186] First indication information for indicating whether the layer 2 feedback is activated in the second cell;

[0187] Applicable object of the layer 2 feedback in the second cell;

[0188] Feedback parameter of the layer 2 feedback in the second cell;

[0189] Modulation and coding mode of the layer 2 feedback in the second cell;

[0190] CRC information of the layer 2 feedback in the second cell;

[0191] Repetition information of the layer 2 feedback in the second cell;

[0192] HARQ feedback information of the layer 2 feedback in the second cell;

[0193] HARQ retransmission information of the layer 2 feedback in the second cell.

[0194] For example, the second configuration information includes the first indication information, and in the case that 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:

[0195] Applicable object of the layer 2 feedback in the second cell;

[0196] Feedback parameter of the layer 2 feedback in the second cell;

[0197] Modulation and coding mode of the layer 2 feedback in the second cell;

[0198] CRC information of the layer 2 feedback in the second cell;

[0199] Repetition information of the layer 2 feedback in the second cell;

[0200] HARQ feedback information of the layer 2 feedback in the second cell;

[0201] HARQ retransmission information of the layer 2 feedback in the second cell.

[0202] In the embodiment, the first device learns whether the layer 2 feedback is activated in the second cell based on the second configuration information, and learns the related configuration of the layer 2 feedback in the second cell based on the second configuration information in the case that the layer 2 feedback is activated in the second cell.

[0203] Optionally, the second configuration information further includes the related configuration of the layer 1 feedback in the second cell.

[0204] Specifically, before the 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 (e.g., a gNB of the first cell or a gNB of the second cell).

[0205] Optionally, the first device receives the second configuration information from the second device, and in this case, the second device can be a gNB of the first cell or a gNB of the second cell.

[0206] In some embodiments, during the process that the first device switches from the first cell to the second cell, the wireless communication method 200 further includes:

[0207] If the feedback parameter of the first cell is reconfigured, the first device performs MAC entity reset.

[0208] In the embodiment, during the process that the first device switches from the first cell to the second cell, if the feedback parameter of the first cell is reconfigured, the first device performs MAC entity reset, which can ensure that the first device and the second device have a consistent understanding of the timing of the reconfigured feedback parameter taking effect.

[0209] For example, when the first cell opens a new feedback configuration, whether the second cell opens a new feedback configuration or not, because the cell switching does not support the forwarding and continuity of the MAC layer data, the MAC entity is reset in its entirety, and there is no special processing of the data related to the layer 2 feedback function in the switching process.

[0210] In some embodiments, the wireless communication method 200 further includes:

[0211] The first device sends capability information to the second device.

[0212] The capability information includes but is not limited to at least one of the following:

[0213] Second indication information for indicating that the first device supports the layer 2 feedback.

[0214] The third indication information is used for 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.

[0215] Specifically, before 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.

[0216] In this embodiment, the first device sends the capability information to the second device, so that the second device can configure the related configuration of the layer 2 feedback based on the capability information.

[0217] Therefore, in the embodiment of the present application, the first device receives first data from the second device; the first device performs receiving feedback for the first data using a target feedback mode; wherein the target feedback mode includes 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. In the embodiment of the present application, the layer 2 feedback has the advantages of high reliability, small delay and low block error rate. Specifically, the first device performs receiving feedback for the first data using layer 2 feedback, which can improve the reliability of the receiving feedback of the first data and reduce the delay of the receiving feedback of the first data. Alternatively, the first device performs receiving feedback for the first data using a feedback mode selected from layer 1 feedback and layer 2 feedback, and the first device can select a suitable feedback mode from layer 1 feedback and layer 2 feedback based on actual needs, which increases the flexibility of the receiving feedback of the first data in implementation and can also improve the feedback performance of the first data. Alternatively, the first device performs receiving feedback for the first data using layer 1 feedback and layer 2 feedback, which can improve the reliability of the receiving feedback of the first data by comprehensively considering the results of layer 1 feedback and layer 2 feedback.

[0218] The technical scheme of the present application is described in detail through specific embodiments.

[0219] Embodiment 1 takes 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, and embodiment 1 relates to the use of layer 1 feedback or layer 2 feedback alone, and / or the joint use of layer 1 feedback and layer 2 feedback. Optionally, in embodiment 1, the layer 1 feedback can be PUCCH-based feedback, and the layer 2 feedback can be feedback for a HARQ process implemented based on a MAC CE.

[0220] In embodiment 1, the layer 2 feedback can be as shown in FIG. 5.

[0221] In embodiment 1, in order for the UE to be able to perform layer 2 feedback, the UE needs to obtain at least one of the following configurations and information:

[0222] The UE needs to support layer 2 feedback, for example, all 6G UEs can be defaulted to support layer 2 feedback, so that the UE does not need to report the capability information of layer 2 feedback separately, but uses 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; or 6G has layer 2 feedback as a special or separate capability information, which is reported by each UE in its own capability report, for example, using 1 bit (bit), to explicitly indicate that it supports layer 2 feedback. In short, the network side needs to know that the UE has this capability;

[0223] For UEs with the capability of layer 2 feedback, the network side device can comprehensively determine the configuration of layer 2 feedback mechanism for the UE according to UE capability, UE service information, current network status information, base station side algorithm information and other factors. Since layer 2 feedback has the characteristics of larger feedback overhead and higher reliability compared to layer 1 feedback, it is preferred to configure layer 2 feedback for services with higher requirements for block error rate, reliability, latency and other indicators. As for network status, layer 2 feedback can be more easily supported when the network load is lighter.

[0224] The network side device configures layer 2 feedback for the UE, which can be per-UE configuration, for example, once layer 2 feedback is configured, all services of the UE perform layer 2 feedback, otherwise, HARQ feedback uses layer 1 feedback. Further, layer 2 feedback can also be configured for uplink (UL) and downlink (DL), for example, downlink supports layer 2 feedback, uplink does not support layer 2 feedback, or vice versa, or both support layer 2 feedback, or neither support layer 2 feedback, etc. It can also be configured for specific services, such as downlink SRB supporting layer 2 feedback, downlink DRB2 supporting layer 2 feedback, downlink MAC CE supporting layer 2 feedback, and the rest of the data not supporting layer 2 feedback. Even the type of downlink MAC CE supporting layer 2 feedback can be configured separately, such as downlink MAC CE supporting layer 2 feedback for carrying duplication activation, downlink MAC CE supporting layer 2 feedback for carrying duplication deactivation, downlink MAC CE supporting layer 2 feedback for carrying SCell activation, downlink MAC CE supporting layer 2 feedback for carrying SCell deactivation, downlink MAC CE supporting layer 2 feedback for carrying DRX command, and other downlink MAC CE using layer 1 feedback.

[0225] The network side device configures the UE with layer 2 feedback parameters, such as the resource block size of layer 2 feedback, the modulation and coding mode, the number of CRC bits, etc., can configure the content of layer 2 feedback, such as NACK / ACK mode, NACK only or ACK only, and can also configure the association between the time domain or frequency domain position of layer 2 feedback and the downlink MAC PDU fed back by layer 2 feedback, such as offset, etc. The above configurations are to further reduce the overhead. If layer 2 feedback can be configured semi-statically by RRC dedicated signaling, the overhead of dynamically indicating layer 2 feedback can be saved, but dynamically indicating layer 2 feedback has better flexibility. Some information of layer 2 feedback can be indicated in semi-static configuration, and a small amount of parameters of layer 2 feedback can be indicated in dynamic signaling (for example, the PDCCH scheduling the downlink MAC PDU carries a small amount of parameters of layer 2 feedback). For example, the time domain offset, that is, the position of n slots or symbols after the end of the downlink MAC PDU or the PDCCH, is the time domain position of layer 2 feedback, and the value of n is dynamically carried by the PDCCH. In this way, the time domain resource position of layer 2 feedback reserved between UEs can be more flexibly coordinated, and the resource efficiency can be improved.

[0226] Compared with layer 1 feedback, layer 2 feedback can be more like a MAC data packet, can adjust the modulation and coding mode (can adjust the modulation and coding mode based on the link quality), can carry CRC check, and even can perform repetition, HARQ feedback and HARQ retransmission. For example, repetition can be started by indicating in the PDCCH or RRC signaling that transmission is repeated 3 times, or the HARQ feedback and HARQ retransmission mechanism is used. Since the layer 2 feedback for downlink data itself is an uplink MAC transmission, if the HARQ retransmission mechanism is started, the network side schedules the retransmission resource of the HARQ process to perform the repeated transmission of the layer 2 feedback itself. In short, these methods can further improve the reliability of layer 2 feedback, so as to achieve fast and accurate feedback of data transmission, and improve the reliability and delay performance of data transmission.

[0227] When the UE is configured with the layer 2 feedback mechanism for downlink data, the UE will perform layer 2 feedback at the position indicated by the network side according to whether the downlink data decoding is correct or not after receiving the downlink data to feed back the reception result of the downlink data to the network side device. The network side device decides whether to retransmit the downlink data according to the layer 2 feedback.

[0228] When some UEs in the network are configured to adopt the layer 2 feedback mechanism for downlink data transmission, and some UEs are configured to adopt the layer 1 feedback mechanism for downlink data transmission, the UEs can work independently according to their respective configurations. The network and the UE communicate and feed back according to the configuration and indication.

[0229] Optionally, when the downlink data transmission of a UE supports both layer 2 feedback mechanism and layer 1 feedback mechanism, how to accurately and correctly transmit and feedback between the UE and the network side includes at least one of the following:

[0230] First, according to the network configuration or the agreed manner, the feedback mode corresponding to the data type needs to be distinguished. Common agreements or configurations include, for example, SRB1 adopts layer 2 feedback mode, all downlink MAC CEs or part of important downlink MAC CEs with high latency reliability requirements adopt layer 2 feedback mode, some data with high latency reliability requirements adopt layer 2 feedback mode, these data can be based on DRB granularity, for example, DRB1 adopts layer 2 feedback mode, etc.

[0231] For downlink data, since the network side device organizes data for transmission, the network side device finally determines which feedback mode the MAC PDU adopts according to the type and composition of the data, and explicitly indicates to the UE; for example, if the MAC PDU contains any data that requires layer 2 feedback, the entire MAC PDU adopts layer 2 feedback mode, otherwise, the MAC PDU does not contain data that requires layer 2 feedback, and the entire MAC PDU adopts layer 1 feedback mode; for example, according to the feedback type corresponding to the highest priority data in the MAC PDU, the feedback mode of the entire MAC PDU is directly determined.

[0232] The network side device explicitly carries the feedback mode of this transmission in the downlink signaling, such as PDCCH, for example, one of layer 2 feedback or layer 1 feedback, then the UE receives data and feeds back according to the indicated feedback mode.

[0233] In embodiment 1, PUCCH and / or MAC CE can be used for transmission and feedback operations between the UE and the network side device to make up for the latency and reliability problems of related art feedback, improve the transmission efficiency of UE data and service experience, and ensure system efficiency on the basis of enhancing data transmission effect.

[0234] Embodiment 2 takes 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, and embodiment 2 relates to the separate use of layer 1 feedback or layer 2 feedback, and / or the joint use of layer 1 feedback and layer 2 feedback. Optionally, in embodiment 2, layer 1 feedback can be PUCCH-based feedback, and layer 2 feedback can be feedback for HARQ processes implemented based on MAC CE.

[0235] For downlink data, different feedback configurations and indications can be adopted for different UEs or different data of a UE. The embodiment further considers the transmission and retransmission of the same data packet, and can also indicate different feedback modes.

[0236] In embodiment 2, as shown in FIG. 6, when the base station schedules the first transmission of downlink data, the UE is instructed to adopt layer 1 feedback. For each subsequent retransmission scheduling, the feedback mode adopted by the retransmission can be explicitly indicated as layer 1 feedback or layer 2 feedback. Generally, when the UE link quality is poor, multiple retransmissions will occur. Therefore, for the subsequent retransmission, layer 2 feedback can be explicitly indicated to improve the correctness of the feedback and avoid NACK misjudgment as ACK, resulting in packet loss and transmission failure.

[0237] Even for the initial transmission, if the data is determined to be layer 1 feedback according to the service condition, when multiple transmissions are unsuccessful, it can be determined that the link is poor, and layer 2 feedback can be subsequently replaced to improve the correctness of the feedback.

[0238] In particular, since layer 1 feedback and layer 2 feedback are generally configured on different frequency and time domain resources, layer 1 feedback and layer 2 feedback can also be simultaneously enabled for a transmission or retransmission. For the UE, feedback is performed according to the feedback mode indicated by the network side. If both are required, feedback is performed once at the resource location corresponding to layer 1 feedback, and then feedback is performed once at the resource location corresponding to layer 2 feedback. Thus, for the network side device, the two results are comprehensively considered to form the final result. For example, when the CRC check of layer 2 feedback is correct, layer 2 feedback is used as the reference. Only when the CRC check of layer 2 feedback fails, the feedback result of layer 1 feedback is additionally considered.

[0239] Further, for the case of only layer 2 feedback, a comprehensive judgment mechanism is introduced to improve the correctness of the feedback, including at least one of the following:

[0240] Since layer 2 feedback can have CRC check, in the ACK / NACK feedback mode of layer 2 feedback, CRC check failure can be considered as ACK->NACK or NACK->ACK error, and thus correction is performed.

[0241] Since the MAC CE transmission has higher detectability than the PUCCH, the ACK only or NACK only feedback can be simply performed, that is, the layer 2 feedback is performed only in the case of correct reception or the layer 2 feedback is performed only in the case of incorrect reception, so that the receiving side can determine whether there is feedback through the detection of the receiving level, thereby determining ACK or NACK. For example, NACK only means that there is only a small probability, about 10%, of sending feedback, so that the interference of the feedback resource to other transmissions can be reduced, and the detection success rate is further improved.

[0242] Embodiment 3 takes the first device as a terminal (UE) and the second device as a network side device (gNB), and takes the first data as uplink data as an example.

[0243] Since the uplink transmission is still scheduled by the base station, the uplink transmission currently has no feedback, that is, the base station does not need to explicitly feed back ACK / NACK to the UE according to the receiving condition, but directly schedules the retransmission of the HARQ process, for example, if the receiving fails, the base station directly schedules the retransmission of the same HARQ process, and the UE side knows that the last transmission is not successful, which is equivalent to NACK, so as to retransmit according to the retransmission scheduling. If the base station side receives successfully, the base station directly schedules the next data packet, that is, allocates the HARQ process to another new data packet, and flips or resets the new data indicator (NDI) to indicate that this is a new transmission, so that the UE side can consider that the last data packet is successful, which is equivalent to ACK, as shown in FIG. 7.

[0244] Since the uplink transmission has no explicit ACK / NACK feedback, the newly introduced layer 2 feedback also does not need to be performed for the uplink transmission, and the PDCCH scheduling (retransmission / new transmission / NDI, etc.) acts as an indirect feedback mechanism for the uplink. The PDCCH scheduling has high reliability. Therefore, the single feedback of the uplink transmission can not need to be enhanced.

[0245] Optionally, the uplink transmission can also use the layer 1 feedback or the layer 2 feedback, or the uplink transmission can use the layer 1 feedback and the layer 2 feedback, and the embodiment is not limited thereto.

[0246] Embodiment 4 takes the first device as a terminal (UE) and the second device as a network side device (gNB), and takes the first data as downlink data as an example. Embodiment 4 relates to the separate use of the layer 1 feedback or the layer 2 feedback, and / or the joint use of the layer 1 feedback and the layer 2 feedback. Optionally, in embodiment 4, the layer 1 feedback can be PUCCH-based feedback, and the layer 2 feedback can be MAC CE-based feedback for the HARQ process.

[0247] When the function related to feedback is reconfigured, for example, the feedback mode is changed, or the feedback parameter is changed, at least one of the following reconfiguration behaviors can occur:

[0248] If the feedback mode is changed, when there is an uncompleted HARQ process, the feedback mode before reconfiguration is continued to be executed until the HARQ process is completed, and the new feedback mode is adopted in the new HARQ process transmission.

[0249] If the feedback parameter is changed, whether the uncompleted HARQ process is immediately executed or waits for the HARQ process to continue to use the parameter before reconfiguration, and then the new feedback mode is adopted in the new HARQ process transmission can be determined according to the changed parameter.

[0250] Alternatively, a synchronous reconfiguration mode is adopted, that is, when the reconfigured parameter needs to be synchronized at both ends to execute the new parameter, otherwise an error will occur, then the synchronous reconfiguration mode needs to be adopted, for example, the MAC is reset, and then the new configuration is used after the random access is used to obtain synchronization again.

[0251] The UE also undergoes handover, and configuration transmission and state transition are performed in the source cell and the target cell, including at least one of the following related operations:

[0252] When the source cell sends a handover request to the target cell, the related configuration of layer 2 feedback and / or the related configuration of layer 1 feedback can be sent to the target cell, so as to facilitate the target cell to determine the new configuration for the UE.

[0253] The target cell configures the related configuration of layer 2 feedback and / or the related configuration of layer 1 feedback for the UE, which can include the configuration of layer 2 feedback in the target cell, for example, start / stop, applicable object, parameter configuration, etc., which is sent to the UE by the source cell through the handover command, and the UE performs in the target cell.

[0254] When the source cell configures the related configuration of layer 2 feedback and / or the related configuration of layer 1 feedback, whether the target cell starts the new feedback configuration or not, because the cell handover does not support the forwarding and continuity of the MAC layer data, the MAC entity is reset, and there is no special processing for the data related to the layer 2 feedback function in the handover process.

[0255] The wireless communication method provided in the embodiments of the present application can be executed by a wireless communication device. In the embodiments of the present application, the wireless communication device is taken as an example to illustrate the wireless communication device provided in the embodiments of the present application.

[0256] Embodiments of the present application provide a wireless communication device. As an example, the wireless communication device can be a communication device or a component in a communication device, such as a chip. The communication device can be a terminal, a network-side device, a server, or the like. For example, the terminal can include, but is not limited to, the types of terminals 11 listed above, the network-side device can include, but is not limited to, the types of network-side devices 12 listed above, and embodiments of the present application are not limited in this regard.

[0257] The wireless communication device includes a receiving module, a sending module, and a processing module. The receiving module, the sending module, and the processing module can be implemented by software or by hardware. When implemented by hardware, the processing module can be implemented by a processor. For example, the processor can include a general-purpose processor, a special-purpose processor, or the like, such as a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), an artificial intelligent (AI) processor, a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a network processor (NP), a field programmable gate array (FPGA), or other programmable logic device, a gate, a transistor, a discrete hardware component, or the like. The receiving module and the sending module can be implemented by a communication interface. The communication interface can include one or more of a transceiver, a pin, a circuit, a bus, a radio frequency unit, or the like.

[0258] Specifically, referring to FIG. 8, when the wireless communication device is a first device or a component in the first device, the wireless communication device 300 includes:

[0259] The receiving module 301 is configured to receive first data from a second device.

[0260] The sending module 302 is configured to perform receiving feedback for the first data using a target feedback mode.

[0261] The target feedback mode includes 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.

[0262] In some embodiments, the layer 2 feedback includes feedback for a hybrid automatic repeat request (HARQ) process based on a medium access control (MAC) control element (CE).

[0263] The layer 1 feedback comprises at least one of: physical uplink control channel (PUCCH) based feedback, physical sidelink control channel (PSCCH) based feedback.

[0264] In some embodiments, the receiving module 301 is further configured to receive first configuration information from the second device;

[0265] The first configuration information comprises at least one of the following:

[0266] The first configuration information comprises at least one of the following:

[0267] The layer 2 feedback is applicable to at least one of the following:

[0268] The layer 2 feedback comprises at least one of the following:

[0269] The layer 2 feedback comprises at least one of the following:

[0270] The layer 2 feedback comprises at least one of the following:

[0271] The layer 2 feedback comprises at least one of the following:

[0272] The layer 2 feedback comprises at least one of the following:

[0273] The layer 2 feedback comprises at least one of the following:

[0274] The layer 2 feedback is applicable to at least one of the following:

[0275] The layer 2 feedback is applicable to at least one of the following:

[0276] The layer 2 feedback is applicable to at least one of the following:

[0277] The layer 2 feedback is applicable to at least one of the following:

[0278] The layer 2 feedback is applicable to at least one of the following:

[0279] The layer 2 feedback is applicable to at least one of the following:

[0280] In some embodiments, 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.

[0281] The feedback content comprises one of:

[0282] a negative acknowledgement (NACK) or an acknowledgement (ACK), only NACK, or only ACK.

[0283] 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.

[0284] 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.

[0285] In some embodiments, the wireless communication device 300 further comprises a processing module 303.

[0286] 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 mode; or,

[0287] The processing module 303 is configured to determine the target feedback mode based on protocol agreement information.

[0288] In some embodiments, 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, and network load.

[0289] In some embodiments, the first data is a medium access control (MAC) protocol data unit (PDU).

[0290] If the MAC PDU comprises any type of data that requires the layer 2 feedback, the target feedback mode comprises the layer 2 feedback, or the target feedback mode comprises the layer 1 feedback and the layer 2 feedback; or, if the MAC PDU does not comprise data that requires the layer 2 feedback, the target feedback mode is the layer 1 feedback; and / or,

[0291] 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 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 includes the Layer 1 feedback.

[0292] In some embodiments, the receiving module 301 is further configured to receive second information from the second device;

[0293] 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 the feedback mode used for the subsequent s retransmissions of the first data.

[0294] Wherein, k and s are positive integers.

[0295] In some embodiments, 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,

[0296] 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.

[0297] In some embodiments, if there is an uncompleted HARQ process in the case of feedback mode change, the sending module 302 is further configured to perform the receiving feedback corresponding to the uncompleted HARQ process according to the feedback mode before the change until the uncompleted HARQ process ends; and / or, if there is an uncompleted HARQ process in the case of feedback mode change, the sending module 302 is further configured to perform the receiving feedback corresponding to the subsequent HARQ process according to the feedback mode after the change after the uncompleted HARQ process ends.

[0298] And / or,

[0299] In the case of feedback parameter change, if there is an uncompleted HARQ process, the sending module 302 is further configured to determine to perform the receiving feedback corresponding to the uncompleted HARQ process according to the feedback parameter before the change based on the changed feedback parameter, or the sending module 302 is further configured to determine to perform the receiving feedback corresponding to the uncompleted HARQ process according to the feedback parameter after the change based on the changed feedback parameter.

[0300] and / or,

[0301] In the case that the feedback parameter is reconfigured, 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 receiving feedback based on the reconfigured feedback parameter.

[0302] In some embodiments, during the process that the wireless communication apparatus 300 switches from a first cell to a second cell, the relevant configuration of the layer 2 feedback is delivered by the first cell to the second cell through a handover request.

[0303] In some embodiments, during the process that the wireless communication apparatus 300 switches 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.

[0304] The second configuration information includes at least one of the following:

[0305] First indication information, used to indicate whether the layer 2 feedback is activated in the second cell;

[0306] Applicable objects of the layer 2 feedback in the second cell;

[0307] Feedback parameters of the layer 2 feedback in the second cell;

[0308] Modulation and coding modes of the layer 2 feedback in the second cell;

[0309] CRC information of the layer 2 feedback in the second cell;

[0310] Repetition information of the layer 2 feedback in the second cell;

[0311] HARQ feedback information of the layer 2 feedback in the second cell;

[0312] HARQ retransmission information of the layer 2 feedback in the second cell.

[0313] In some embodiments, during the process that the wireless communication apparatus 300 switches from a first cell to a second cell, the wireless communication apparatus 300 further includes a processing module 303.

[0314] If the feedback parameter of the first cell is reconfigured, the processing module 303 is configured to perform a MAC entity reset.

[0315] In some embodiments, the sending module 302 is further configured to send capability information to the second device.

[0316] The capability information includes at least one of the following:

[0317] a second indication information, used for indicating that the wireless communication device 300 supports the layer 2 feedback;

[0318] a third indication information, used for indicating that the wireless communication device 300 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.

[0319] Referring to FIG. 9, when the wireless communication device is the second device or a component in the second device, the wireless communication device 400 includes:

[0320] a sending module 401, configured to send first data to a first device;

[0321] a receiving module 402, configured to receive, from the first device, receiving feedback performed by the first device on the first data using a target feedback manner;

[0322] wherein the target feedback manner includes one of the following: layer 2 feedback, a feedback manner selected from layer 1 feedback and layer 2 feedback, layer 1 feedback, and layer 2 feedback.

[0323] In some embodiments, the layer 2 feedback includes feedback on a hybrid automatic repeat request (HARQ) process based on a medium access control (MAC) control element (CE).

[0324] The layer 1 feedback includes 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).

[0325] In some embodiments, the sending module 401 is further configured to send first configuration information to the first device.

[0326] wherein the first configuration information includes related configuration of the layer 2 feedback.

[0327] wherein the related configuration of the layer 2 feedback includes at least one of the following:

[0328] a subject of the layer 2 feedback;

[0329] a feedback parameter of the layer 2 feedback;

[0330] a modulation and coding mode of the layer 2 feedback;

[0331] cyclic redundancy check (CRC) information of the layer 2 feedback;

[0332] repetition information of the layer 2 feedback;

[0333] HARQ feedback information of the layer 2 feedback;

[0334] HARQ retransmission information of the layer 2 feedback.

[0335] In some embodiments, the applicable object of the layer 2 feedback comprises at least one of:

[0336] all traffics of the first device, uplink traffics of the first device, downlink traffics of the first device, sidelink traffics of the first device, specific traffics of the first device, specific MAC CEs of the first device;

[0337] wherein the specific traffics comprise at least one of:

[0338] downlink signaling radio bearer (SRB), downlink data radio bearer (DRB), downlink MAC CE, sidelink SRB, sidelink DRB, sidelink MAC CE;

[0339] wherein the specific MAC CEs comprise at least one of:

[0340] 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.

[0341] In some embodiments, the feedback parameter of the layer 2 feedback comprises at least one of: size of feedback resource, feedback content, modulation and coding scheme, number of CRC bits, time domain offset, frequency domain offset;

[0342] wherein the feedback content comprises one of:

[0343] negative acknowledgement (NACK) or acknowledgement (ACK), NACK only, ACK only;

[0344] 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;

[0345] 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.

[0346] 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 mode.

[0347] In some embodiments, 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, and a network load.

[0348] In some embodiments, the sending module 401 is further configured to send second information to the first device;

[0349] The second information is used to indicate that the first data uses the layer 1 feedback or the layer 2 feedback for this transmission or retransmission, or the second information is used to indicate that the first data uses the layer 1 feedback or the layer 2 feedback for the kth retransmission, or the second information is used to indicate a feedback mode used by the first data for the subsequent s retransmissions.

[0350] Wherein k and s are positive integers.

[0351] In some embodiments, during the process of switching 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 switching request.

[0352] In some embodiments, during the process of switching the first device from a first cell to a second cell, the sending module 401 is further configured to send second configuration information to the first device;

[0353] The second configuration information includes at least one of:

[0354] First indication information, used to indicate whether the layer 2 feedback is activated in the second cell;

[0355] An applicable object of the layer 2 feedback in the second cell;

[0356] A feedback parameter of the layer 2 feedback in the second cell;

[0357] A modulation and coding mode of the layer 2 feedback in the second cell;

[0358] CRC information of the layer 2 feedback in the second cell;

[0359] Repetition information of the layer 2 feedback in the second cell;

[0360] HARQ feedback information of the layer 2 feedback in the second cell;

[0361] HARQ retransmission information of the layer 2 feedback in the second cell.

[0362] In some embodiments, the receiving module 402 is further configured to receive capability information from the first device;

[0363] The capability information comprises at least one of the following:

[0364] Second indication information, used to indicate that the first device supports the layer 2 feedback.

[0365] 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.

[0366] Therefore, in the embodiments of the present application, the first device receives first data from the second device; and the first device performs 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. In the embodiments of the present application, the layer 2 feedback has the advantages of high reliability, small time delay and low block error rate. Specifically, the first device performs receiving feedback for the first data using the layer 2 feedback, which can improve the reliability of the receiving feedback for the first data and reduce the time delay of the receiving feedback for the first data. Alternatively, the first device performs receiving feedback for the first data using a feedback mode selected from layer 1 feedback and layer 2 feedback, and the first device can select a suitable feedback mode from layer 1 feedback and layer 2 feedback based on actual needs, which increases the flexibility in implementation of the receiving feedback for the first data and can improve the feedback performance of the first data. Alternatively, the first device performs receiving feedback for the first data using layer 1 feedback and layer 2 feedback, and the result of layer 1 feedback and the result of layer 2 feedback are comprehensively considered, which can improve the reliability of the receiving feedback for the first data.

[0367] The wireless communication apparatus provided by the embodiments of the present application can implement each process of the method embodiment of FIG. 4 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0368] As shown in FIG. 10, the embodiments of the present application further provide a communication device 500, which comprises a processor 501 and a memory 502, and the memory 502 has stored programs or instructions executable on the processor 501.

[0369] For example, when the communication device 500 is a first device, the programs or instructions are executed by the processor 501 to implement each step performed by the first device in the above wireless communication method embodiments, and the same technical effects can be achieved. To avoid repetition, details are not described herein.

[0370] For example, the communication device 500 is the second device, the program or the instruction is executed by the processor 501 to realize each step of the second device in the wireless communication method embodiment, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0371] The embodiment of the application further provides a terminal, comprising a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used to run a program or an instruction to realize the steps in the method embodiment shown in FIG. 4. The terminal embodiment corresponds to the first device side method embodiment or the second device side method embodiment, and each implementation process and implementation manner of the above method embodiment can be applied to the terminal embodiment, and the same technical effect can be achieved. The terminal can be the wireless communication device 300 shown in FIG. 8 or the wireless communication device 400 shown in FIG. 9. Specifically, FIG. 11 is a schematic diagram of the hardware structure of a terminal for realizing the embodiment of the application.

[0372] The terminal 600 includes, but is not limited to, at least part of the components such as a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 608, a memory 609, and a processor 610.

[0373] Those skilled in the art can understand that the terminal 600 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected with the processor 610 through a power management system, so as to realize the functions of power management, such as charging, discharging, and power consumption management, through the power management system. The terminal structure shown in FIG. 11 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than the diagram, or combine certain components, or different component arrangements, which will not be repeated here.

[0374] It should be understood that in the embodiment of the application, the input unit 604 can include a graphics processor 6041 and a microphone 6042, and the graphics processor 6041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 606 can include a display panel 6061, which can be configured in the form of a liquid crystal display, an organic light emitting diode, etc. 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 can include a touch detection device and a touch controller. The other input devices 6072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), a trackball, a mouse, a joystick, etc., which will not be repeated here.

[0375] In the embodiments of the present application, the radio frequency unit 601 can transmit the downlink data received from the network side device to the processor 610 for processing. In addition, the radio frequency unit 601 can send uplink data to the network side device. Generally, the radio frequency unit 601 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0376] The memory 609 can be used to store software programs or instructions and various data. The memory 609 can mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area can store an operating system, application programs or instructions required by at least one function (such as a sound playing function, an image playing function, etc.), etc. In addition, the memory 609 can include a volatile memory or a non-volatile memory. The non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synch link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 609 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0377] The processor 610 can include one or more processing units; optionally, the processor 610 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 610.

[0378] In some embodiments, the first device is a terminal;

[0379] The radio frequency unit 601 is configured to receive first data from a second device.

[0380] The radio frequency unit 601 is further configured to perform receiving feedback for the first data using a target feedback mode.

[0381] The target feedback mode includes 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.

[0382] In some embodiments, the second device is a terminal.

[0383] The radio frequency unit 601 is configured to send first data to a first device.

[0384] The radio frequency unit 601 is further configured to receive, from the first device, receiving feedback for the first data performed by the first device using a target feedback mode.

[0385] The target feedback mode includes 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.

[0386] Therefore, in the embodiments of the present application, the first device receives first data from the second device; the first device performs receiving feedback for the first data using a target feedback mode; and the target feedback mode includes 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. In the embodiments of the present application, layer 2 feedback has the advantages of high reliability, small time delay and low block error rate. Specifically, the first device performs receiving feedback for the first data using layer 2 feedback, which can improve the reliability of the receiving feedback for the first data and reduce the time delay of the receiving feedback for the first data. Alternatively, the first device performs receiving feedback for the first data using a feedback mode selected from layer 1 feedback and layer 2 feedback. The first device can select a suitable feedback mode from layer 1 feedback and layer 2 feedback based on actual needs, which increases the flexibility of the receiving feedback for the first data in implementation and can improve the feedback performance of the first data. Alternatively, the first device performs receiving feedback for the first data using layer 1 feedback and layer 2 feedback. By comprehensively considering the results of layer 1 feedback and layer 2 feedback, the reliability of the receiving feedback for the first data can be improved.

[0387] It can be understood that the implementation processes of each implementation mode mentioned in the embodiments can refer to the related descriptions of the method embodiments and achieve the same or corresponding technical effects. To avoid repetition, they will not be described here again.

[0388] The embodiment of the present application further provides a network side device, comprising a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used to run programs or instructions to realize the steps of the method embodiment shown in Fig. 4. The network side device embodiment corresponds to the method embodiment executed by the first device or the second device, and each implementation process and implementation manner of the above method embodiment can be applied to the network side device embodiment and can achieve the same technical effects.

[0389] Specifically, the embodiment of the present application further provides a network side device, which can be the wireless communication device 300 shown in Fig. 8 or the wireless communication device 400 shown in Fig. 9. As shown in Fig. 12, the network side device 700 comprises an antenna 71, a radio frequency device 72, a baseband device 73, a processor 74 and a memory 75. The antenna 71 is connected with the radio frequency device 72. In the uplink direction, the radio frequency device 72 receives information through the antenna 71 and sends the received information to the baseband device 73 for processing. In the downlink direction, the baseband device 73 processes the information to be sent and sends it to the radio frequency device 72, and the radio frequency device 72 processes the received information and sends it out through the antenna 71.

[0390] The method executed by the first device or the second device in the above embodiment can be realized in the baseband device 73, which comprises a baseband processor.

[0391] The baseband device 73 can comprise at least one baseband board, for example, a plurality of chips are arranged on the baseband board, as shown in Fig. 12, one of the chips is a baseband processor, which is connected with the memory 75 through a bus interface to call the programs in the memory 75 and execute the operations of the first device or the second device shown in the above method embodiment.

[0392] The network side device can further comprise a network interface 76, which is a common public radio interface (CPRI) for example.

[0393] Specifically, the network side device 700 of the embodiment of the present application further comprises instructions or programs stored in the memory 75 and executable on the processor 74, the processor 74 calls the instructions or programs in the memory 75 to execute the method executed by each module shown in Fig. 8 or Fig. 9 and achieves the same technical effects, and thus the details are not described herein.

[0394] The embodiment of the present application further provides a readable storage medium, which stores programs or instructions, the programs or instructions are executed by a processor to realize each process of the above wireless communication method embodiment and achieve the same technical effects, and thus the details are not described herein.

[0395] The processor is the processor in the first device or the second device in the above-mentioned embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. In some examples, the readable storage medium can be a non-transitory readable storage medium.

[0396] The embodiment of the present application further provides a chip, which comprises a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running programs or instructions to realize the processes of the above-mentioned wireless communication method embodiments and achieve the same technical effects. To avoid repetition, details are not described here.

[0397] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0398] The embodiment of the present application further provides a computer program / program product stored in a storage medium, which is executed by at least one processor to realize the processes of the above-mentioned wireless communication method embodiments and achieve the same technical effects. To avoid repetition, details are not described here.

[0399] The embodiment of the present application further provides a wireless communication system, which comprises a first device and a second device. The first device can be used to execute the steps performed by the first device in the above-mentioned wireless communication method. The second device can be used to execute the steps performed by the second device in the above-mentioned wireless communication method.

[0400] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to the order of performing the functions shown or discussed, but can also include performing the functions in a substantially simultaneous manner or in a reverse order, for example, the described method can be performed in an order different from the described order, and various steps can be added, omitted or combined. In addition, the features described with reference to some examples can be combined in other examples.

[0401] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned example methods can be realized by means of a computer software product and a general hardware platform as necessary, and of course can also be realized by hardware. The computer software product is stored in a storage medium (such as a ROM, a RAM, a magnetic disc, an optical disc, etc.), and includes a plurality of instructions for enabling a terminal or a network side device to execute the method described in each embodiment of the present application.

[0402] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative rather than limiting. Those skilled in the art can make many forms of embodiments under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims, and these embodiments all belong to the protection of the present application.

Claims

1. A method for wireless communication, comprising: receiving, by a first device, first data from a second device; performing, by the first device, reception feedback 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. 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: a physical uplink control channel (PUCCH) based feedback, a physical sidelink control channel (PSCCH) based feedback. The method further comprises: receiving, by the first device, first configuration information from the second device; wherein the first configuration information comprises a related configuration of the layer 2 feedback; wherein the related configuration of the layer 2 feedback comprises at least one of: an applicable object of the layer 2 feedback; a feedback parameter of the layer 2 feedback; a modulation and coding mode 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. 4.The method of claim 3, wherein: the applicable object 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; 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, 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, 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, a frequency domain offset; wherein the feedback content comprises one of: a negative acknowledgement (NACK) or an acknowledgement (ACK), only NACK, only 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. The method further comprises: receiving, by the first device, first information from the second device; wherein the first information is used to indicate the target feedback mode; or, ​ 3. The method of claim 1 or 2, wherein, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 6. The method of any one of claims 1 to 5, wherein, ​ ​ 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: 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, 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 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 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 includes the layer 1 feedback.

9. The method of any one of claims 1 to 8, wherein, The method further includes: The first device receives second information from the second device; The second information is used to indicate that the first data uses the layer 1 feedback or the layer 2 feedback for this transmission or retransmission, or the second information is used to indicate that the first data uses the layer 1 feedback or the layer 2 feedback for the kth retransmission, or the second information is used to indicate the feedback mode used for the subsequent s retransmissions of the first data. Wherein, k and s are positive integers. 10.The method of any one of claims 1-9, 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 of any one of claims 1 to 10, wherein, The method further includes: If there is an uncompleted HARQ process in the case of feedback mode change, the first device performs the receiving feedback corresponding to the uncompleted HARQ process according to the feedback mode before the change until the uncompleted HARQ process is completed; and / or, if there is an uncompleted HARQ process in the case of feedback mode change, the first device performs the receiving feedback corresponding to the subsequent HARQ process according to the feedback mode after the change after the uncompleted 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 passed 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; 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; An applicable object 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 the feedback parameter of the first cell is reconfigured, the first device performs a MAC entity reset.

15. The method of any one of claims 1 to 14, wherein, The method further comprises: The first device sends capability information to the second device; The capability information comprises at least one of the following: 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 wireless communication method, comprising: A second device sends first data to a 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; 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.

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: Applicable object of the layer 2 feedback; Feedback parameter of the layer 2 feedback; 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 applicable object 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 CE 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 CE comprises 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: size of feedback resource, feedback content, modulation and coding scheme, number of CRC bits, time domain offset, 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 time domain position of the layer 2 feedback and time domain position of data fed back by the layer 2 feedback; The frequency domain offset is an offset between frequency domain position of the layer 2 feedback and 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: type of the first data, composition of the first data, priority of the first data, transmission latency requirement of the first data, transmission block error rate requirement of the first data, transmission reliability requirement of the first data, network load.

23. The method of any one of claims 16 to 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, wherein, In a process in which the first device switches 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, wherein, In a process in which the first device switches from a first cell to a second cell, the method further comprises: The second device sends second configuration information to the first device; 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; An applicable object 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.

26. The method of any one of claims 16 to 25, wherein, The method further comprises: The second device receives capability information from the first device; 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 apparatus comprising: 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; 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, 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 the following: feedback based on a physical uplink control channel (PUCCH), feedback based on a physical sidelink control channel (PSCCH).

29. The apparatus of claim 27 or 28, wherein, The receiving module is further configured to receive first configuration information from the second device; The first configuration information comprises a related configuration of the layer 2 feedback; The related configuration of the layer 2 feedback comprises at least one of the following: An applicable object of the layer 2 feedback; A feedback parameter of the layer 2 feedback; 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.

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 the following: type of the first data, composition of the first data, priority of the first data, transmission delay requirement of the first data, transmission block error rate requirement of the first data, transmission reliability requirement of the first data, network load.

32. The apparatus of any of claims 27 to 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 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; wherein k and s are positive integers.

33. The apparatus of any of claims 27 to 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 to 33, wherein In a process in which the wireless communication device is handed over 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; The second configuration information comprises at least one of the following: first indication information, used for 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 of claims 27-34, wherein, in a process that the wireless communication device switches 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: 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 of claims 36-39, wherein, the sending module is further configured to send second information to the first device; wherein 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 subsequent s retransmissions of the first data; wherein k and s are positive integers. 41.The apparatus of any one of claims 36-40, wherein, during a handover of the first device from a first cell to a second cell, the sending module is further configured to send second configuration information to the first device; 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; feedback parameters of the layer 2 feedback in the second cell; a modulation and coding scheme 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; and HARQ retransmission information of the layer 2 feedback in the second cell. 42.A first device comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions, when executed by the processor, implement 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 storing programs or instructions executable on the processor, the programs or instructions, when executed by the processor, implement steps of the wireless communication method according to any one of claims 16-26. 44.A readable storage medium, the readable storage medium storing programs or instructions, the programs or instructions, when executed by a processor, implement steps of the wireless communication method according to any one of claims 1-15, or implement steps of the wireless communication method according to any one of claims 16-26.

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