Wireless communication method, device, and storage medium

Abstract

Embodiments of the present application disclose a wireless communication method, a device, and a storage medium. In the method, when a terminal device and a network device perform SDT, the terminal device performs, on the basis of at least one first configuration, radio link monitoring on a serving cell of the terminal device, the at least one first configuration comprising a reference signal used for performing radio link monitoring. It may be understood that, in the technical solutions in the embodiments of the present application, a radio link monitoring mechanism is introduced in an SDT process, and a new SDT method is provided. In addition, radio link monitoring is performed in the SDT process, so that when link quality of a radio link is greater than or equal to a quality threshold, a terminal device can perform data transmission, to ensure data transmission performance of SDT.

Description

Methods, devices and storage media for wireless communication Technical Field

[0001] This application relates to the field of communication technology, and includes, but is not limited to, a wireless communication method, device, and storage medium. Background Technology

[0002] In 5th generation (5G) systems or new radio (NR) systems, terminal devices support small data transmission (SDT) in the radio resource control (RRC) inactive (RRC-INACTIVE) state. That is, when the terminal device is in the RRC inactive state, it does not need to enter the RRC connected state (RRC_CONNECTED) to send small data to network devices (e.g., base stations), thereby improving the transmission efficiency of small data.

[0003] However, with the increase in business types and application scenarios, the SDT method in related technologies may no longer be applicable, and a new SDT method is needed. Summary of the Invention

[0004] This application provides a wireless communication method, device, and storage medium.

[0005] A first aspect of this application provides a wireless communication method applied to a terminal device, the method comprising:

[0006] In the case of small data transmission SDT with network devices, radio link monitoring is performed on a first cell based on at least one first configuration, the at least one first configuration including a reference signal for performing radio link monitoring, the first cell including the serving cell of the terminal device.

[0007] A second aspect of this application provides a wireless communication method applied to a network device, the method comprising:

[0008] Small data transmission SDT with terminal devices;

[0009] Wherein, when the terminal device performs SDT, it performs radio link monitoring on a first cell based on at least one first configuration, wherein the at least one first configuration includes a reference signal for performing radio link monitoring, and the first cell includes the serving cell of the terminal device.

[0010] A third aspect of the embodiments of this application provides a terminal device, including a first processing unit and a second transceiver unit, wherein:

[0011] The first processing unit is configured to perform radio link monitoring on a first cell based on at least one first configuration while controlling the first transceiver unit to perform small data transmission SDT with the network device. The at least one first configuration includes a reference signal for performing radio link monitoring, and the first cell includes the serving cell of the terminal device.

[0012] A fourth aspect of the embodiments of this application provides a network device, including a second processing unit and a second transceiver unit, wherein:

[0013] The second transceiver unit is configured to perform small data transmission SDT with the terminal device under the control of the second processing unit. When performing SDT, the terminal device performs radio link monitoring on a first cell based on at least one first configuration. The at least one first configuration includes a reference signal for performing radio link monitoring. The first cell includes the serving cell of the terminal device.

[0014] A fifth aspect of this application provides a terminal device, the terminal device including a first processor coupled to a first memory, which can be used to execute instructions in the first memory to implement the method in any possible implementation of the first aspect described above. The network device further includes a first transceiver, the first processor being coupled to the first transceiver, wherein:

[0015] The first processor is configured to perform radio link monitoring on a first cell based on at least one first configuration while controlling the first transceiver to perform small data transmission SDT with the network device. The at least one first configuration includes a reference signal for performing radio link monitoring, and the first cell includes the serving cell of the terminal device.

[0016] A sixth aspect of this application provides a network device, the network device including a second processor coupled to a second memory, which can be used to execute instructions in the second memory to implement the method in any possible implementation of the second aspect described above. The terminal device further includes a second transceiver, the second processor being coupled to the second transceiver, wherein:

[0017] The second transceiver is configured to perform Small Data Transmission (SDT) with the terminal device under the control of the second processor. During SDT, the terminal device performs radio link monitoring on a first cell based on at least one first configuration. The at least one first configuration includes a reference signal for performing radio link monitoring, and the first cell includes the serving cell of the terminal device.

[0018] A seventh aspect of the embodiments of this application provides a chip including a processor and a memory. The processor may be a logic circuit, an integrated circuit, or a general-purpose processor, etc. The memory stores instructions. The processor may implement the methods in the first or second aspect by reading the software code stored in the memory. The memory may be integrated into the processor or may be located outside the processor and exist independently.

[0019] An eighth aspect of this application provides a computer program product comprising: a computer program (also referred to as code or instructions) that, when run, causes a computer to perform the methods described in the first or second aspect above.

[0020] A ninth aspect of this application provides a computer-readable storage medium storing a computer program (also referred to as code or instructions) that, when run on a computer, causes the computer to perform the methods described in the first or second aspect above.

[0021] In the wireless communication method, device, and storage medium provided in the embodiments of this application, the terminal device can also perform wireless link monitoring during the SDT process, providing a new SDT method; and by performing wireless link monitoring during the SDT process, the terminal device can transmit data when the link quality of the wireless link is greater than or equal to the quality threshold, so as to ensure the data transmission performance of SDT. Attached Figure Description

[0022] Figure 1A is a schematic diagram of an example of a communication system provided in an embodiment of this application;

[0023] Figure 1B is a schematic diagram of an example of a communication system provided in an embodiment of this application;

[0024] Figure 2 is a flowchart of an example of a wireless communication method provided in an embodiment of this application;

[0025] Figure 3 is a general flowchart of the SDT process in the related technology provided in the embodiments of this application;

[0026] Figure 4 is a structural block diagram of an example of the protocol stack of a terminal device provided in an embodiment of this application;

[0027] Figure 5 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0028] Figure 6 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0029] Figure 7 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0030] Figure 8 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0031] Figure 9 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0032] Figure 10 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0033] Figure 11 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0034] Figure 12 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0035] Figure 13 is a flowchart of another example of the wireless communication method provided in the embodiments of this application;

[0036] Figure 14 is a structural block diagram of an example of a terminal device provided in an embodiment of this application;

[0037] Figure 15 is a structural block diagram of an example of a network device provided in an embodiment of this application;

[0038] Figure 16 is a schematic diagram of an example of a network device provided in an embodiment of this application;

[0039] Figure 17 is a schematic diagram of an example of a terminal device provided in an embodiment of this application. Detailed Implementation

[0040] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0041] To enhance SDT, this application proposes a solution based on the communication system described in Figure 1A or Figure 1B.

[0042] The communication system 100 shown in Figures 1A and 1B includes a terminal device and a network device. The terminal device is located within the coverage area of ​​one or more cells provided by the network device and communicates with the network device, for example, to transmit data with the network device, based on the radio resources provided by the serving cell of the terminal device.

[0043] The terminal device can serve one or more cells.

[0044] For example, in the communication system 100 shown in Figure 1A, there is a network device, labeled as network device 112. The terminal device 111 is located within the coverage area of ​​a cell of network device 112, which can be labeled as cell a. Then the serving cell of terminal device 111 is cell a.

[0045] In the communication system 100 shown in Figure 1B, multiple network devices are included, labeled as network device 122 and network device 123 respectively. Terminal device 121 is located within the coverage area of ​​multiple cells. For example, terminal device 121 is located within the coverage area of ​​cell b of network device 122 and cell c of network device 123. Then, the serving cells of the terminal are cell b and cell c. When the terminal device has multiple serving cells, the terminal device can operate in a manner such as carrier aggregation (CA), dual connectivity (DC), or coordinated multiple points transmission / reception (CoMP), etc., without limitation.

[0046] Of course, the communication system 100 may also include more terminal devices and more network devices, which will not be listed here.

[0047] The communication system 100 in this application embodiment can be any radio access technology (RAT) system, such as a global system for mobile communications (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division on duplex (TDD) system, a universal mobile telecommunication system (UMTS) system, a worldwide interoperability for microwave access (WiMAX) communication system, a 5G system, or an NR system, etc. Furthermore, the communication system 100 in this application embodiment can also be applied to future-oriented communication technologies, such as a 6th generation (6G) mobile communication system, a satellite communication system, or a non-terrestrial network (NTN), etc., which will not be described in detail here.

[0048] It should be noted that the system architecture described in the embodiments of this application is for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and does not constitute a limitation on the technical solutions provided in the embodiments of this application. Those skilled in the art will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0049] The network device in this application embodiment can be a device for communicating with a terminal device. This network device can also be called an access network device or a wireless access network device, such as a base station. In this application embodiment, the network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. A base station can broadly encompass, or be replaced by, various names including: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, transmitting and receiving point (TRP), transmitting point (TP), master MeNB, secondary SeNB, multi-mode radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), CU, DU, positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or similar, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. Base stations can also be mobile switching centers, devices that perform base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, network-side devices in 6G networks, and devices that perform base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or device forms used in the network equipment.

[0050] It should also be understood that the terminal device in the embodiments of this application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device in the embodiments of this application may be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects, and machines, such as a handheld device with wireless connectivity, vehicle-mounted device, etc. The terminal devices in the embodiments of this application can be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, and smart homes, etc. Optionally, the UE can act as a base station. For example, the UE can act as a scheduling entity, providing sidelink signals between UEs in V2X or D2D, etc. For example, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

[0051] In addition, the above communication system may also include other devices, such as relay devices, routing devices, or core network devices, which are not shown in the communication systems shown in Figures 1A and 1B, but those skilled in the art can set them according to actual use, and no restrictions are imposed here.

[0052] In 5G or NR systems, terminal devices have three RRC states: RRC connected (RRC_CONNECTED), RRC idle (RRC-IDLE), and RRC inactive (RRC-INACTIVE).

[0053] The RRC-connected state refers to the state a terminal device is in after completing a random access procedure and establishing an RRC connection with a network device (such as an access network device). In the RRC-connected state, the terminal device can transmit data with the network device. For example, the terminal device can send uplink data to the network device, and the network device can send downlink data to the terminal device. Alternatively, the terminal device can also transmit specific data and / or control channels with the network device to transmit specific information or unicast information. In the RRC-connected state, both the network device and the core network maintain the terminal device's context information. It should be understood that the context information of terminal devices stored by network devices and the core network differs. The context information stored by network devices is related to the access stratum (AS), which mainly includes the Radio Resource Control (RRC) and Radio Access Network Application Part (RAN AP) layers and the protocol layers below them. The context information stored by the core network is related to the non-access stratum (NAS), which is deployed above the AS layer and is mainly responsible for core network-level functions such as mobility management, session management, and security control. In this case, the location of the terminal device obtained by the network device can be based on the cell level, meaning it can determine which cell the terminal device is located in.

[0054] The RRC-IDLE state refers to the state of a terminal device when it is camped in a cell but not performing random access. The terminal device typically enters the RRC-IDLE state after powering on or after RRC release. In the RRC-IDLE state, there is no RRC connection between the terminal device and network devices (e.g., camped access network devices), the network devices do not store the terminal device's context, and no connection has been established between the network devices and the core network for that terminal device. If the terminal device needs to transition from the RRC-IDLE state to the RRC-connected state, it needs to initiate an RRC connection establishment process. In this case, the terminal device can be paged by sending a paging message through the core network.

[0055] The RRC-INACTIVE state is a state between the RRC connected state and the RRC idle state. In the RRC-INACTIVE state, the terminal device disconnects from the network device but retains its connection to the core network. Furthermore, the connection established between the network device and the core network for that terminal device is not released; the core network continues to store the terminal device's context information. That is, although the terminal device disconnects from the network device in the RRC-INACTIVE state, the network device retains its context information. In this situation, the network device can page the terminal device in the RRC-INACTIVE state through the radio access node (RAN). Introducing the RRC-INACTIVE state reduces the overhead of air interface signaling between the terminal device and the network device, and enables faster restoration of wireless connections and faster data transmission.

[0056] In 5G or NR systems, terminal devices support SDT in RRC-INACTIVE mode. This means that terminal devices can send small data to network devices (e.g., gNBs) without entering RRC connected mode, thus improving small data transmission efficiency and effectively reducing terminal device power consumption. In this embodiment, small data can be understood as data and / or signaling with a data size less than or equal to a threshold (which could be 200 bytes or 300 bytes, etc.), i.e., small data volume or relatively small data and / or signaling volume. Network devices and terminal devices can determine whether data is small data based on data tags or data types. For example, network devices and terminal devices can negotiate data tags based on data size, where data tags can include large or small data, and the data tag can determine whether a piece of data is small data; or, network devices and terminal devices can determine whether data is small data based on data type, for example, data with data types such as heartbeat packets, instant messages, or periodic data is small data, while data with data types such as files, videos, or audio is large data.

[0057] However, with the development of communication technology, the types of services and application scenarios may increase in future-oriented communication systems (such as 6G systems), and the SDT method in related technologies may no longer be applicable. Therefore, a new SDT method is needed.

[0058] In view of this, embodiments of this application propose a wireless communication method in which, when a terminal device and a network device are performing SDT, the terminal device performs radio link monitoring on the serving cell of the terminal device based on at least one first configuration, wherein the at least one first configuration includes a reference signal for performing radio link monitoring.

[0059] It can be understood that the technical solution in this application embodiment introduces a wireless link monitoring mechanism in the SDT process, providing a new SDT method; and by performing wireless link monitoring in the SDT process, the terminal device can transmit data when the link quality of the wireless link is greater than or equal to the quality threshold, so as to ensure the data transmission performance of SDT.

[0060] In the embodiments of this application, terms such as "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, "first instruction" and "second instruction" are used to distinguish different user instructions, but do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that "first" and "second" do not necessarily imply that they are different.

[0061] It should be noted that, in this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0062] "At least one" means one or more, while "more" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0063] The technical solutions provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0064] It should be understood that the technical solutions in the embodiments of this application can be applied to the communication system 100 shown in FIG1A or FIG1B. The network device involved in the embodiments of this application can be network device 112 in the communication system 100 shown in FIG1A, or network device 122 or network device 123 in the communication system 100 shown in FIG1B, or it can be a device or chip in network device 112, network device 122 or network device 123, etc. The terminal device involved in the embodiments of this application can be terminal device 111 in the communication system 100 shown in FIG1A, or terminal device 121 in the communication system 100 shown in FIG1B, or it can be a device or chip in terminal device 111 or terminal device 121, etc.

[0065] The embodiments of this application will be described in detail below using the interaction between terminal devices and network devices as an example.

[0066] It is understood that any terminal device in a communication system can communicate with one or more network devices connected to it using the same method, and this application does not limit this.

[0067] Please refer to Figure 2, which is a flowchart of a wireless communication method provided in an embodiment of this application. The flowchart is described as follows:

[0068] S201. The network device sends third information to the terminal device, and the terminal device receives the third information.

[0069] In this embodiment of the application, the third information is used to indicate at least one first configuration, which is used to indicate the resources for the terminal device to perform radio link monitoring of the first cell during the SDT process.

[0070] First, the first cell in the embodiment of this application will be described.

[0071] The first cell may include the serving cell of the terminal device. The serving cell of the terminal device may be one, for example, cell a in the communication system 100 shown in Figure 1A; the serving cell of the terminal device may also be multiple, for example, cells b and c in the communication system 100 shown in Figure 1B, without limitation.

[0072] Of course, the first cell in this application may include not only the serving cell of the terminal device, but also other cells. For example, the other cell can be understood as a SCell in MCG or SCG. In this embodiment, the first cell is not limited. For ease of explanation, the first cell is taken as the serving cell of the terminal device in the following example.

[0073] The relationship between at least one first configuration and the first cell in the embodiments of this application will be explained below.

[0074] In this embodiment, the number of first configurations is not limited; a first configuration may include one or more. As described above, the number of first cells may be one or more. Therefore, the relationship between at least one first configuration and a first cell may include, but is not limited to, the following three:

[0075] First type of relationship:

[0076] When there is only one first configuration and one first cell, the first configuration corresponds one-to-one with the first cell. This can be understood as the resources configured in the first configuration being resources for wireless link monitoring of the first cell.

[0077] The second type of relationship:

[0078] When there are multiple first configurations and only one first cell, each of the multiple first configurations corresponds to one first cell. This can be understood as the combination of resources configured in the multiple first configurations constituting all the resources for radio link monitoring of the first cell. In other words, each first configuration includes a portion of the resources used for radio link monitoring of the first cell, and only by combining multiple first configurations can all the resources for radio link monitoring of the first cell be obtained. Alternatively, each of the multiple first configurations includes all the resources for radio link monitoring of the first cell. These multiple first configurations represent multiple sets of resources for radio link monitoring of the first cell, and the terminal device can use any one of the multiple first configurations to perform radio link monitoring of the first cell.

[0079] The third type of relationship:

[0080] When there are multiple first configurations and multiple first cells, each of the multiple first configurations can correspond to each of the multiple first cells. This can be understood as each of the multiple first cells using the same resources for radio link monitoring. The relationship between the multiple first configurations and any one of the first cells can be as described in the second relationship above, and will not be repeated here. Alternatively, the multiple first configurations can have a one-to-one correspondence with the multiple first cells. That is, the number of multiple first configurations is the same as the number of multiple first cells, with one first configuration corresponding to one first cell. In this case, the essence of the correspondence between the multiple first configurations and the multiple first cells is similar to the first relationship. Alternatively, multiple first cells can be divided into multiple groups, with each group of first cells corresponding to a portion of the first configurations in the multiple first configurations. For example, the multiple first cells include a first group of cells and a second group of cells, and the multiple first configurations include a first partial configuration and a second partial configuration. The first partial configuration corresponds to the first group of cells, and each first cell in the first group of cells has the same resources for radio link monitoring. The second partial configuration corresponds to the second group of cells, and each first cell in the second group of cells has the same resources for radio link monitoring.

[0081] Of course, the correspondence between at least one first configuration and the first cell can also include other relationships besides the three mentioned above, which will not be described in detail here.

[0082] In this embodiment, the at least one first configuration includes a reference signal for performing radio link monitoring. The reference signal may include, but is not limited to, at least one of the following signals: synchronization signal and physical broadcast channel block (SSB); channel state information-reference signal (CSI-RS); and cell reference signal (CRS). It can be understood that the terminal device can perform radio link monitoring of the first cell during the SDT process based on the reference signal in at least one first configuration.

[0083] Additionally, it should be noted that when the serving cell of the terminal device includes multiple cells, i.e., the number of first cells is multiple, the multiple first cells may not be cells of the same network device. For example, as shown in Figure 1B above, cell b is the cell of network device 122 and cell c is the cell of network device 123. In this case, at least one first configuration can be obtained from multiple different network devices, or it can be obtained by one of the multiple different network devices and then sent to the terminal device after obtaining the configurations of all network devices. No restriction is imposed here.

[0084] To improve the signal transmission quality in the communication system 100 shown in Figure 1A or Figure 1B, beamforming technology can be used in the communication system 100. This allows at least one beam to be configured for each cell, enabling a terminal device to communicate with a network device using one of the at least one beam. For example, when multiple beams are configured for each cell, different beams correspond to different beam directions, allowing the terminal device to communicate with the network device using the beam with the best quality. In this embodiment, at least one reference signal in the first configuration corresponds to a beam in the first cell. This correspondence between the beam and the reference signal can be pre-configured by the network device, pre-agreed upon by the network device and the terminal device, or pre-defined in a protocol. One reference signal can correspond to one beam, or one reference signal can correspond to multiple beams; no limitation is imposed here.

[0085] It should be noted that the at least one first configuration includes a reference signal for wireless link monitoring. This can be understood as including at least a reference signal in the at least one first configuration. Of course, it may also include other content. The specific content of the at least one first configuration will be described in detail below.

[0086] In this embodiment of the application, no restrictions are placed on the specific form, transmission method, or transmission timing of the third information.

[0087] As an example, the third piece of information can be a system message from the network device, which indicates at least one first configuration. This system message may include a master information block (MIB), system information block 1 (SIB1), and other system information (OSI), where the OSI includes SIB2 to SIB9, which contain system information other than the MIB and SIB1. In this embodiment, at least one first configuration can be indicated by any one of the MIB, SIB1 to SIB9. For example, one or more fields can be added to any one of the MIB, SIB1 to SIB9 to indicate at least one first configuration; alternatively, a new piece of information can be added to the system message, such as adding SIB10, to indicate at least one first configuration. In this embodiment, no limitation is placed on how the network device indicates at least one first configuration through system messages.

[0088] If a network device indicates at least one first configuration via a MIB, the MIB is broadcast on the broadcast channel (BCH). In this way, a terminal device can receive the MIB during cell search and thus acquire at least one first configuration. If a network device indicates at least one first configuration via SIB1, SIB1 can be broadcast on the downlink shared channel (DL-SCH) or periodically on the DL-SCH according to the terminal device's request, allowing a connected terminal device to receive the SIB1 and acquire at least one first configuration. If a network device indicates at least one first configuration via SIB2 to SIB9, SIB2 to SIB9 can be broadcast on the multicast channel (MCH) or BCH. In idle mode, a terminal device can periodically listen to the MCH or BCH to acquire at least one first configuration.

[0089] As another example, the third information can also be dedicated signaling for the terminal device, indicating at least one first configuration. This dedicated signaling can be sent by the network device to the terminal device after the network device or the terminal device triggers SDT. For example, when triggering RA-SDT, the dedicated signaling can be Msg2 or Msg4, or a message used to send downlink data; when triggering CG-SDT, the dedicated signaling can be the first downlink message sent by the network device to the terminal device, or a message containing downlink data sent by the network device to the terminal device. For example, it could be the first message from the network device to the terminal device containing downlink data.

[0090] As another example, the third information can be system messages and dedicated signaling. For instance, a network device can configure at least one second configuration for a terminal device via system messages. This at least one second configuration is used for wireless link monitoring. Then, after the network device or the terminal device triggers SDT, it can activate at least some of the configurations in the at least one second configuration via dedicated signaling. The configuration activated in the at least one second configuration is the at least one first configuration.

[0091] Of course, network devices can also send third-party information in other ways, which will not be listed one by one in this application embodiment.

[0092] It should be noted that step S201 is an optional step, meaning it is not mandatory. For example, at least one first configuration for monitoring the radio link of the first cell may be pre-stored in the terminal device, or it may be pre-agreed upon by the terminal device and the network device, for example, as agreed upon in a protocol. In this case, step S201 does not need to be executed. Therefore, in Figure 2, step S201 is represented by a dashed line to indicate that this step is optional.

[0093] S202. When the terminal device and the network device perform SDT, the terminal device performs radio link monitoring on the first cell based on at least one first configuration.

[0094] When the terminal device is in RRC-INACTIVE state and small data arrives at the terminal device or network device, SDT (Small Data Transmission) can be performed between the terminal device and the network device. In this embodiment, "small data arrival" can be understood as small data to be transmitted.

[0095] It should be noted that SDT cannot be initiated when all data arrives. SDT introduces a radio bearer-based triggering mechanism. Network devices can configure radio bearers (RBs) for terminal devices to perform SDT. These RBs are used to carry and transmit small amounts of data, and in this embodiment, they can be simply referred to as SDT-RBs. The SDT-RB may include at least one data radio bearer (DRB) and / or at least one signaling radio bearer (SRB).

[0096] Data carried on these SDT-RBs can be transmitted through the SDT process. When data arrives on a non-SDT-RB, the SDT process cannot be initiated. For example, if a network device configures three RBs for a terminal device, labeled RB1, RB2, and RB3, where RB1 and RB2 are SDT-RBs and RB3 is a non-SDT-RB, then the SDT process can only be initiated when data arrives on RB1 or RB2, but cannot be initiated when data arrives on RB3.

[0097] In the embodiments of this application, the SDT can be triggered by either a terminal device or a network device. An SDT triggered by a terminal device can be called (Mobile Originated Small Data Transmission, MO-SDT), and an SDT triggered by a network device can be called (Mobile Terminated Small Data Transmission, MT-SDT).

[0098] As an example, when a small amount of data arrives at a network device, i.e., downlink data awaiting transmission on the SDT-RB, the network device can trigger MT-SDT. For instance, the network device can send a paging message carrying an SDT indication. After receiving the paging message with the SDT indication, the terminal device can determine whether the current RSRP measurement is not less than the RSRP threshold for triggering SDT. If the current downlink RSRP measurement is not less than the RSRP threshold, the terminal device can send a response message to the network device. This response message can be an RRC recovery request message for MT-SDT. When the network device receives this response message, it can send small data to the terminal device, thereby initiating SDT with the terminal device.

[0099] As another example, when a small amount of data arrives at the terminal device, that is, there is uplink data to be transmitted on the SDT-RB, the terminal device can initiate MO-SDT. For example, the terminal device can first determine that the amount of uplink data to be transmitted is not greater than the small data amount threshold, that is, the sum of the amounts of all uplink data to be transmitted configured on SDT-RB is not greater than the data amount threshold. It can also determine that the current downlink RSRP measurement result is not less than the RSRP threshold. If both conditions are met, a carrier for SDT can be selected. This carrier for SDT can be a supplementary uplink (SUL) carrier or a normal uplink (NUL) carrier. The terminal device can then determine whether there are valid SDT resources on the selected carrier for SDT. These SDT resources include CG-SDT resources or RA-SDT resources. For example, for RA-SDT resources, as long as the carrier for SDT is configured with RACH resources for SDT, it can be considered that there are valid RA-SDT resources on that carrier. For CG-SDT resources, the terminal device can consider the CG-SDT resources on that carrier as valid CG-SDT resources when it is synchronized with the network device uplink. If valid SDT resources exist on the selected carrier for SDT, the terminal device can send small data on the valid SDT resources to perform SDT with the network device.

[0100] In this embodiment, the terminal device and the network device perform SDT (Software-Defined Technology). This SDT can be either the aforementioned RA-SDT or the aforementioned CG-SDT. The network device or the terminal device can choose to use RA-SDT or CG-SDT according to actual usage requirements. For example, for MO-SDT, if the terminal device selects a carrier for SDT where only valid RA-SDT resources exist, the terminal device can trigger RA-SDT; if the terminal device selects a carrier for SDT where only valid CG-SDT resources exist, the terminal device can trigger CG-SDT. For MT-SDT, the network device can also use a similar method to select and trigger CG-SDT or RA-SDT, which will not be elaborated further here.

[0101] It is understood that if the terminal device and the network device perform SDT while the terminal device is in the RRC-INACTIVE state, and no wireless connection is established between the terminal device and the network device while the terminal device is in the RRC-INACTIVE state, then the serving cell in this application embodiment can be understood as the cell in which the terminal device last established a wireless connection with the network device before it was in the RRC-INACTIVE state; or, the cell in which the terminal device last established a wireless connection with the network device before it was in the RRC-INACTIVE state.

[0102] In this embodiment of the application, in order to enable SDT to transmit a larger amount of data or for a longer duration, the SDT process in the related technology is first analyzed.

[0103] Based on the SDT process in related technologies, a flowchart of the SDT process can be obtained as shown in Figure 3. As shown in Figure 3, the flowchart includes the following steps:

[0104] S301, SDT resource configuration.

[0105] Before a terminal device performs SDT, the network device needs to configure the resources for SDT for the terminal device. For RA-SDT, the network device can use system messages to configure the resources for SDT for the terminal device; for CG-SDT, the network device can use RRC messages to configure the resources for SDT for the terminal device.

[0106] S302, The terminal device is in RRC inactive (RRC-INACTIVE) state.

[0107] S303, SDT between terminal equipment and network equipment.

[0108] When the terminal device is in an RRC-INACTIVE state and meets the conditions for initiating an SDT process, the terminal device sends a first SDT message based on the network device's configured resources for SDT. This first SDT message may include an RRC message (e.g., an RRC resume request message) and uplink small data sent by the terminal device.

[0109] After sending the first SDT message, the terminal device remains in the RRC-INACTIVE state; after receiving the first SDT message, the network device can send downlink small data to the terminal device.

[0110] S304, SDT process terminated.

[0111] After the terminal device and network device complete the SDT (Software-Defined Technology) process, the network device can send an RRC (Release Control Code) message to the terminal device to terminate the SDT process. During the SDT process, the terminal device remains in the RRC-INACTIVE state.

[0112] In the aforementioned SDT process, only small amounts of data can be transmitted and only short-duration SDT processes are supported. However, in future communication systems (such as 6G systems), SDT faces the need to support the transmission of larger amounts of data and / or signaling, or to support data transmission for longer periods. How to enable SDT to meet the requirements of larger data transmission volumes and longer durations is the problem that SDT in related technologies needs to solve.

[0113] During communication between terminal devices and network devices, even if the wireless link between the terminal devices and network devices has been initially established, issues such as the mobility of the terminal devices or the stability of the network devices may cause the channel quality of the wireless link between the terminal devices and network devices to fall below the threshold, i.e., a link problem has occurred. If data transmission is performed under the condition of a link problem, the data receiver (e.g., the network device) may not be able to accurately obtain the transmitted data, thus failing to achieve the effect of data transmission and also causing the terminal device to consume more power due to unnecessary data transmission. Therefore, it is necessary to monitor the wireless link.

[0114] As can be seen from the above analysis, in order to enable SDT to transmit larger amounts of data or support longer data transmission durations, it is necessary to introduce a wireless link monitoring mechanism in the SDT process.

[0115] In this embodiment of the application, the terminal device will perform radio link monitoring (RLM) on the first cell during the SDT process. It can be understood that one cell is one radio link. When there is only one first cell, the terminal device needs to perform radio link monitoring on one cell. When there are multiple first cells, the terminal device needs to perform radio link monitoring on each cell separately.

[0116] Depending on the wireless link monitoring method, the contents of each first configuration differ. The contents of the first configuration will be explained below when introducing the different wireless link monitoring methods.

[0117] The wireless link monitoring in this application embodiment can include, but is not limited to, the following three methods:

[0118] The first monitoring method:

[0119] To clearly illustrate the RLM process in the embodiments of this application, the protocol stack of the terminal device will be described first.

[0120] As shown in Figure 4, the protocol stack of the terminal device includes a non-access stratum (NAS) layer, a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a media access control (MAC) layer, and a physical (PHY) layer. The PDCP, RLC, and MAC layers constitute a layer 2 (L2) protocol stack. In this embodiment, RLM can be understood as the terminal device's detection at the physical or L2 layer; that is, if a problem is detected at the physical or L2 layer, a radio link failure (RLF) is identified.

[0121] In the first monitoring method, the resources included in the at least one first configuration may include the following information:

[0122] The wireless link monitoring includes the reference signal, physical layer link synchronization threshold, physical layer link out-of-sync threshold, the counter count for recording physical layer link out-of-sync indications, and the timer duration for determining whether an RLF (Restricted Link Failure) has occurred.

[0123] It should be noted that, based on the correspondence between at least one first configuration and the first cell, the information included in each first configuration may be the same or different. For example, if there is one first cell and multiple at least one first configuration, for ease of explanation, let's take two at least one first configuration as an example. Then, one of the two first configurations can indicate the reference signal for radio link monitoring, while the other first configuration can indicate the aforementioned physical layer link synchronization threshold, physical layer link out-of-sync threshold, the count of the counter recording the physical layer link out-of-sync indication, and the duration of the timer for determining whether an RLF has occurred. Alternatively, if there are multiple first cells, for example, two, labeled as cell a and cell b, and multiple at least one first configuration, for example two, then each first configuration... This configuration is used to indicate all the resources required for a first cell to perform radio link detection. For example, one first configuration indicates the reference signal, physical layer link synchronization threshold, physical layer link out-of-sync threshold, count of the counter recording physical layer link out-of-sync indication, and timer duration for determining whether an RLF (Remote Link Failure) has occurred for radio link detection in cell a. Another first configuration indicates the reference signal, physical layer link synchronization threshold, physical layer link out-of-sync threshold, count of the counter recording physical layer link out-of-sync indication, and timer duration for determining whether an RLF has occurred for radio link detection in cell b. It can be understood that the types of information included in each first configuration are the same, both including the above five types of information. However, the values ​​of each type of information in the two first configurations may be different. For example, taking the inclusion of reference signals for radio link detection in the first configuration as an example, the reference signals indicated in the first configuration corresponding to cell a could be reference signal 1 and reference signal 2, while the reference signals indicated in the first configuration corresponding to cell b could be reference signal 2 and reference signal 4. The values ​​of other types of information in the multiple first configurations are similar to the aforementioned descriptions of the values ​​of reference signals in the multiple first configurations, and will not be listed one by one here.

[0124] The first monitoring method will now be explained in conjunction with the protocol stack of the terminal device and the resources included in at least one first configuration. For ease of explanation, we will take as an example at least one first configuration and one first cell.

[0125] The physical layer of the terminal device measures the reference signal indicated in the first configuration to determine the quality of the physical downlink control channel (PDCCH).

[0126] It should be noted that the measurement of the reference signal in this embodiment can be understood as the measurement of the reference signal corresponding to at least one beam. For a cell, at least one beam can be set. When a cell includes multiple beams, the above measurement can be performed on multiple beams in the cell. In this case, the reference signal indicated in the first configuration can be the reference signal corresponding to each beam.

[0127] As an example, a beam with a specific reference signal among multiple beams can be used as the beam for the aforementioned reference signal measurement. That is, when a cell includes multiple beams, not every beam has a corresponding reference signal. If a certain beam has a corresponding reference signal, the terminal device can measure the reference signal corresponding to that beam. If a certain beam does not have a corresponding reference signal, the terminal device does not need to measure the reference signal of that beam.

[0128] In the first monitoring method, the terminal device acquires the PDCCH quality by measuring the reference signal. As an example, the PDCCH quality can be indicated by the block error rate (BLER). When the PDCCH quality falls below a first threshold, the terminal device's physical layer determines in-synchronization (IS) and indicates IS to the terminal device's RRC layer. Alternatively, when the PDCCH quality exceeds a second threshold, the terminal device's physical layer determines out-of-synchronization (OOS) and indicates OOS to the terminal device's RRC layer. As an example, the first threshold could be 2% BLER, and the second threshold could be 10% BLER.

[0129] When the counter used to record out-of-step indications in the terminal settings (e.g., counter 310 or N310, or other counters) increments by 1 according to the OOS instruction, and when the counter value reaches the count indicated in the first configuration, a timer (e.g., timer 310 or T310, or other timer) is started. When the timer's duration reaches the timer duration indicated in the first configuration, the terminal device determines that an RLF has occurred in the first cell. If the terminal device determines that no RLF has occurred in the first cell, the terminal device can continue to perform SDT.

[0130] As can be seen from the above, in the first monitoring method, the process of wireless link monitoring by the terminal device is relatively complex. For example, the physical layer of the terminal device needs to send a synchronization indication or a loss-of-synchronization indication to the RRC layer, and it needs to use counters and timers to determine the RLF (Restricted Link Failure). To simplify the wireless link monitoring process, this application embodiment also provides a second monitoring method.

[0131] The second monitoring method:

[0132] In the second monitoring method, the at least one first configuration may include a reference signal for wireless link monitoring, which may include, but is not limited to, at least one of SSB, CSI-RS and CRS.

[0133] It should be noted that in this monitoring method, the correspondence between at least one first configuration and the first cell, the relationship between the first cell and the beam, the beam used for reference signal measurement in the first cell, the correspondence between the reference signal and the beam, and the description of the reference signal are similar to those in the first monitoring method, and will not be repeated here.

[0134] In the second monitoring method, wireless link monitoring of the first cell based on at least one first configuration can be understood as monitoring at least one beam corresponding to the first cell based on at least one first configuration, or as the physical layer of the terminal device measuring the reference signal indicated in the first configuration on at least one beam, or as the physical layer of the terminal device measuring the reference signal corresponding to each beam on each beam, and the measurement result is obtained by measuring the reference signal corresponding to each beam on each of the at least one beam.

[0135] In this embodiment of the application, the measurement result includes information indicating the channel quality of the wireless link, wherein the information indicating the channel quality of the wireless link includes at least one of the following:

[0136] Reference signal received power (RSRP);

[0137] Reference signal received quality (RSRQ);

[0138] Signal-to-interference-plus-noise ratio (SINR);

[0139] Bit error rate (BER);

[0140] Block error rate (BLER).

[0141] It is understood that the measurement result may include any one of the above-mentioned information. For example, the measurement result may be the RSRP obtained by measuring the reference signal, or the RSRQ obtained by measuring the reference signal, etc. The measurement result may also include a combination of at least two of the above-mentioned information. For example, the measurement result may be the RSRQ and SINR obtained by measuring a reference signal, or the RSRP and RSRQ obtained by measuring a reference signal, without limitation. Of course, the measurement result may also include other information that can be used to indicate channel quality, which will not be listed here.

[0142] Furthermore, it should be noted that in this embodiment, no restrictions are placed on how the terminal device measures the reference signal. That is, the terminal device can measure the reference signal once or multiple times. For multiple measurements, the terminal device can periodically measure the reference signal according to a preset cycle, or it can measure multiple times as needed, without periodic measurement. In this case, the terminal device can obtain multiple measurement results on one beam. In this embodiment, the number of measurement results on one beam is not limited; there can be one or more measurement results on one beam.

[0143] As an example, let the measured result be RSRP, and the first cell includes three beams, labeled beam A, beam B, and beam C. The reference signal corresponding to beam A is reference signal 1, the reference signal corresponding to beam B is reference signal 2, and the reference signal corresponding to beam C is reference signal 3. The terminal device measures the RSRP of reference signal 1 on beam 1, obtaining two measurement results X, namely measurement result X1 and measurement result X2. The terminal device measures the RSRP of reference signal 2 on beam 2, obtaining one measurement result Y. The terminal device measures the RSRP of reference signal 3 on beam 3, obtaining three measurement results Z, namely measurement result Z1, measurement result Z2, and measurement result Z3. Then, measurement results X1, X2, Y, Z1, Z2, and Z3 are the measurement results obtained from radio link monitoring of the first cell.

[0144] As another example, continuing with the above example, the terminal device measures the RSRP of reference signal 1 on beam 1, obtaining measurement results X1 and X2, and then obtains the average value of measurement results X1 and X2, which is marked as the first average value; the terminal device measures the RSRP of reference signal 2 on beam 2, obtaining a measurement result Y of the RSRP corresponding to beam 2; the terminal device measures the RSRP of reference signal 3 on beam 3, obtaining measurement results Z1, Z2 and Z3, and then obtains the average value of measurement results Z1, Z2 and Z3, which is marked as the second average value. Then, the first average value, measurement result Y and the second average value are the measurement results of wireless link monitoring of the first cell.

[0145] As can be seen from the above examples, when the terminal device uses the same measurement method to measure the reference signal on a beam, the measurement results obtained can be different. That is to say, the way the measurement results are represented can be different. Here, we do not impose any restrictions on the way the measurement results are represented.

[0146] In this embodiment, if the measurement result indicates that the link quality of the first cell is greater than or equal to a quality threshold, the terminal device continues to use SDT for data transmission. It should be noted that this quality threshold can be preset by the terminal device, agreed upon by the terminal device and the network device, or determined by the terminal device based on actual usage. For example, different data types correspond to different quality thresholds, and the terminal device can pre-store the correspondence between data types and quality thresholds. The terminal device can determine the quality threshold based on the data type of the small data to be transmitted. Of course, the quality threshold can also be determined in other ways, which are not limited here.

[0147] Compared to the first monitoring method, which includes multiple types of resources in its first configuration, the second monitoring method may only include a reference signal in its first configuration. This reduces the amount of resource information required for the first configuration, thus simplifying the resource configuration for wireless link monitoring. Furthermore, with the reduced resource information in the first configuration, the monitoring process for the wireless link by the terminal device is also simplified. In the second monitoring method, the terminal device only needs to measure the reference signal on the corresponding beam. Therefore, the second monitoring method simplifies wireless link monitoring in the first method in terms of both resource configuration and the monitoring process, providing a relatively simplified method for wireless link monitoring.

[0148] Furthermore, since the method of wireless link monitoring is simplified, it can save energy consumption of terminal devices during the wireless link monitoring process, which is more in line with the purpose of SDT between terminal devices and network devices.

[0149] Additionally, as shown in Figure 2, when step S201 is executed, the execution order between step S201 and step S202 is that step S201 is executed first, followed by step S202. It should be noted that this embodiment does not restrict the execution order of steps S201 and S202. For example, steps S201 and S202 can be executed in parallel, or the SDT in step S202 can be executed first, followed by step S201, and finally the radio link monitoring of the first cell based on at least one first configuration in step S202 can be executed. The execution order between steps S201 and S202 shown in Figure 2 is only an example and should not be construed as a restriction on the execution order between steps S201 and S202.

[0150] In the above technical solution, a wireless link monitoring mechanism is introduced into the SDT process, providing a new SDT method. In this way, SDT can continue to be used for data transmission when the wireless link monitoring result indicates that the link quality is greater than or equal to the quality threshold. This allows the SDT duration to be longer and the amount of data transmitted to be increased. Compared with the SDT process in related technologies, it can achieve the effect of enhanced SDT.

[0151] Depending on the channel resources used when the terminal sends its first small data transmission, SDT supports the following two schemes:

[0152] The first approach is SDT based on random access (RA) (RA-SDT for short). In this approach, the terminal device uses the resources of message A in two-step random access (2-step RA) or message 3 based on four-step random access (4-step RA) for small data transmission.

[0153] The second approach: SDT based on pre-configured radio resources. In this approach, the pre-configured radio resources can be configured grant (CG) resources based on the physical uplink shared channel (PUSCH). In this case, it can be called SDT based on the CG process (CG-SDT for short). In CG-SDT, the terminal device uses CG resources for small data transmissions.

[0154] The wireless communication method in the embodiments of this application will be described below in conjunction with these two SDT schemes.

[0155] Please refer to Figure 5, which is a flowchart of another example of the wireless communication method provided in the embodiments of this application. In Figure 5, taking RA-SDT as an example, the flowchart includes the following steps:

[0156] S501: Network devices send broadcast messages, and terminal devices receive broadcast messages.

[0157] In this embodiment of the application, the broadcast message includes resource configuration for indicating random access resources.

[0158] As an example, this resource configuration can indicate which random access resources are used to initiate normal random access and which random access resources are used to send message 1 during the RA-SDT process.

[0159] It should be noted that random access is divided into four-step random access (4-step RA) and two-step random access (2-step RA). As an example, a terminal device can initiate either 4-step RA or 2-step RA based on the relationship between the currently measured RSRP and a preset RSRP threshold. For instance, if the currently measured RSRP is greater than or equal to the preset RSRP threshold, the terminal device can initiate 2-step RA; if the currently measured RSRP is less than the preset RSRP threshold, the terminal device can initiate 4-step RA. Figure 5 illustrates the principle of four-step random access. After receiving the broadcast message, the terminal device obtains the resource configuration used to indicate the random access resources.

[0160] S502, The terminal device sends Msg1 to the network device through random access resources, and the network device receives Msg1.

[0161] Msg1 includes a random access preamble. The preamble can be generated by the terminal device according to specific rules, but the network device can recognize the preamble generated by the terminal device.

[0162] As an example, if the terminal device wants to perform SDT, the preamble in Msg1 can be different from the preamble used by the terminal device to initiate normal random access without performing SDT. In this way, the network device can distinguish the terminal device's intention to initiate random access based on the different preambles sent by the terminal device, such as whether it is to perform SDT or to initiate normal random access.

[0163] As another example, if the resource configuration in step S501 indicates which random access resources are used to initiate normal random access and which random access resources are used to send Msg1 during SDT, then the terminal device can send Msg1 on different random access resources according to its intent. In this way, the network device can distinguish the terminal device's intent based on the resource receiving Msg1. In this case, the preamble sent by the terminal device for SDT and for initiating normal random access can be the same or different.

[0164] S503: The network device sends Msg2 to the terminal device, and the terminal device receives Msg2.

[0165] Msg2 can be called a random access response (RAR) message.

[0166] After sending Msg1, the terminal device starts the RAR time window and listens for the RAR sent by the base station within the RAR time window. If no RAR is received within the RAR time window, it means that the random access has failed and the terminal device can re-initiate the random access procedure.

[0167] Unlike Msg2 in the random access procedure of related technologies, in this embodiment, Msg2 may include at least one first configuration and a third configuration. The at least one first configuration is used to instruct the terminal device on the resources for radio link monitoring of the first cell during the SDT process. For example, it may include a reference signal for radio link monitoring, the specific content of which is similar to the corresponding content in step S201 and will not be repeated here. The third configuration can be understood as the configuration information included in Msg3 in related technologies. For example, the third configuration is used to instruct the terminal device on the resources for sending Msg3. Alternatively, the third configuration may also include at least one of a temporary cell radio network temporary identifier (T-CRNTI) and a timing advance (TA). The content of the third configuration is not limited here.

[0168] In the example shown in Figure 5, Msg2 can be understood as the third piece of information in step S201.

[0169] S504, The terminal device sends Msg3 to the network device and performs radio link monitoring on the serving cell based on at least one first configuration, and the network device receives Msg3.

[0170] The terminal device can send Msg3 on the resources indicated in the third configuration. Msg3 may include an RRC request message and uplink small data sent by the terminal device to the network device. The RRC request message may include an RRC Resume Request message or other RRC messages with the same function, which will not be listed here.

[0171] In addition, the RRC request message may also contain information such as the identifier of the terminal device. The identifier of the terminal device may be a unique identifier assigned to the terminal device by the core network, or the I-RNTI of the terminal device, etc.

[0172] It should be noted that in some embodiments, the network device may not be able to obtain the SDT intent of the terminal device through step S502. For example, the network device may not configure random access resources for the terminal device to trigger SDT, or the preamble sent by the terminal device for SDT and for initiating normal random access may be the same. In this case, Msg3 may also include a buffer status report (BSR). After receiving Msg3 including BSR, the network device can indirectly know the SDT intent of the terminal device.

[0173] Unlike RA-SDT in related technologies, in this embodiment, when the terminal device obtains at least one first configuration for radio link detection of the first cell via Msg2, the terminal device can perform radio link detection on the first cell while the terminal device and network device are sending small data. It is understood that the first cell is the serving cell of the terminal device, and the terminal device can perform radio link monitoring on the serving cell based on the method in step S202, which will not be elaborated further here. For example, the terminal device can perform radio link monitoring on the serving cell before sending Msg3. If the measurement result indicates that the link quality of the serving cell is greater than or equal to a quality threshold, the terminal device will continue to perform RA-SDT, that is, it can continue to execute the subsequent steps of RA-SDT. Of course, the terminal device can also perform radio link monitoring on the serving cell after sending Msg3, or the terminal device can simultaneously execute the steps of sending Msg3 and performing radio link monitoring on the serving cell. In this embodiment, the execution order of the steps of sending Msg3 and performing radio link monitoring on the serving cell is not restricted.

[0174] Additionally, it is understood that the terminal device may perform radio link monitoring of the serving cell only once or multiple times until the SDT process ends; this is not restricted. If the measurement results indicate that the link quality of the first cell is greater than or equal to the quality threshold, the terminal device will continue to use SDT for data transmission.

[0175] S505: The network device sends Msg4 to the terminal device, and the terminal device receives Msg4.

[0176] The Msg4 may include an RRC response message.

[0177] As an example, if the terminal device or network device has no further data transmission requirement, the RRC response message can also be used to indicate that the uplink small packet data transmission on the terminal device was successful and to instruct the terminal device to remain in the current RRC inactive state. For example, the RRC response message could be an RRC Release message or other RRC messages with the same function. The RRC Release message carries a suspend indication; that is, Msg 4 includes the message "RRC release with suspend indication". The RRC Release message indicates the release of the connection between the terminal device and the network device. The suspend indication instructs the terminal device, after releasing the RRC connection, not to enter the RRC idle state, but rather to enter the RRC inactive state.

[0178] As another example, an RRC response message can be used to indicate that uplink small packet data transmission by the terminal device has failed and to instruct the terminal device to remain in its current connected state. For example, the RRC response message could be an RRC Connection Reject message, an RRC Reject message, or another RRC message with the same function. The terminal device can determine that uplink small packet data transmission has failed based on the RRC response message and maintain its current connected state accordingly.

[0179] S506: The network device sends downlink small data to the terminal device, and the terminal device receives the downlink small data.

[0180] If a network device has downlink small data to send to a terminal device, the network device can send that downlink small data to the terminal device.

[0181] It should be noted that step S506 can also be combined with step S505 into one step. For example, the network device can send the downlink small data and the RRC response message together to the terminal device in step S505.

[0182] It should be noted that, in the example shown in Figure 5, the network device configures at least one first configuration to the terminal device via Msg2, that is, the third information is Msg2. In other examples, the third information can also be other information in RA-SDT, such as Msg4 or a message after Msg4 used to send downlink data (e.g., the information used to carry downlink small data in step S506). The terminal device is instructed to at least one first configuration through the third information. After receiving at least one first configuration indicated by the network device, the terminal device can perform radio link monitoring on the serving cell.

[0183] Figure 5 illustrates the wireless communication method in the embodiments of this application based on RA-SDT with four-step random access. The wireless communication method provided in the embodiments of this application is described below based on RA-SDT with two-step random access.

[0184] Please refer to Figure 6, which is a flowchart of another example of the wireless communication method provided in an embodiment of this application. As shown in Figure 6, the flowchart includes the following steps:

[0185] S601. The network device sends a broadcast message to the terminal device, and the terminal device receives the broadcast message.

[0186] Step S601 is similar to step S501, and will not be described again here.

[0187] S602, The terminal device sends MsgA to the network device, and the network device receives MsgA.

[0188] The terminal device sends MsgA to the network device according to the random access resource indicated in the broadcast message. MsgA may include a preamble, an RRC request message, and uplink small data. The description of the preamble and the random access resource for sending the preamble is referred to the description in step S502. The description of the RRC request message and the uplink small data can be referred to the description of the corresponding content in step S504, and will not be repeated here.

[0189] S603. The network device sends MsgB to the terminal device, the terminal device receives MsgB, and performs radio link monitoring on the first cell based on at least one first configuration.

[0190] MsgB includes information from Msg 2 in step S503 other than the third configuration and Msg 4 in step S505. For details, please refer to the descriptions of Msg2 and Msg4 in steps S503 and S505, which will not be repeated here.

[0191] Unlike the MsgB in the random access procedure in related technologies, in this embodiment, the MsgB further includes at least one first configuration. The at least one first configuration is used to indicate the resources for the terminal device to perform radio link monitoring of the first cell during the SDT process. For example, it may include a reference signal for performing radio link monitoring. The specific content is similar to the corresponding content in step S201, and will not be repeated here.

[0192] Once the terminal device obtains at least one first configuration via MsgB, it can perform radio link monitoring on the first cell based on at least one first configuration. If the measurement results indicate that the link quality of the first cell is greater than or equal to a quality threshold, the terminal device continues to use SDT for data transmission.

[0193] S604. The network device sends downlink small data to the terminal device, and the terminal device receives the downlink small data.

[0194] Step S604 is similar to step S506, and will not be described again here.

[0195] It should be noted that step S603 can also be combined with step S604 into one step. For example, the network device can send the downlink small data and MsgB together to the terminal device in step S603.

[0196] It should be noted that, in the example shown in Figure 6, the network device configures at least one first configuration to the terminal device via MsgB, that is, the third information is MsgB. In other examples, the third information can also be other information in RA-SDT, such as a message after MsgB for sending downlink data (e.g., downlink small data in step S604). The terminal device is informed of at least one first configuration through the third information. After receiving at least one first configuration indicated by the network device, the terminal device can perform radio link monitoring on the serving cell.

[0197] In the examples shown in Figure 5 or Figure 6, at least one first configuration is indicated by one of the messages in the RA-SDT process. In other examples, a combination of multiple messages may also be used to indicate the at least one first configuration. The following explanation, in conjunction with a flowchart, illustrates an example of using a combination of multiple messages to indicate the at least one first configuration.

[0198] Please refer to Figure 7, which is a flowchart of another example of the wireless communication method provided in the embodiments of this application. As shown in Figure 5, the flowchart includes the following steps:

[0199] S701, the network device sends the fourth information, and the terminal device receives the fourth information.

[0200] In this embodiment, the fourth information is used to indicate at least one second configuration, which is used for wireless link monitoring. This can be understood as the network device instructing the terminal device to use at least one configuration capable of wireless link monitoring via the fourth information. The content of each second configuration can be referred to the description of the first configuration in step S201, and will not be repeated here.

[0201] As an example, the fourth piece of information could be a system message sent by a network device.

[0202] As another example, the fourth information could also be the broadcast information in step S501. In this case, the fourth information includes, in addition to at least one second configuration, a resource configuration for indicating random access resources, which may indicate which random access resources are used to initiate normal random access and which random access resources are used to send Msg1 during the RA-SDT process.

[0203] Alternatively, the fourth piece of information can be any downlink information before the terminal device triggers RA-SDT, without any restrictions.

[0204] For ease of explanation, the fourth information is taken as broadcast information that includes at least one second configuration and resource configuration for indicating random access resources.

[0205] S702, The terminal device sends Msg1 to the network device through random access resources, and the network device receives Msg1.

[0206] When a terminal device needs to trigger RA-SDT, it can send Msg1 to indicate that the reason for the terminal device to initiate random access is to perform SDT.

[0207] Step S702 is similar to step S502, and will not be described again here.

[0208] S703: The network device sends Msg2 to the terminal device, and the terminal device receives Msg2.

[0209] Unlike step S503, Msg2 in this embodiment may include an activation instruction and a third configuration. The activation instruction is used to indicate the activation of at least one first configuration, and the activation instruction is used to activate at least one of at least one second configuration; thus, the activated at least one configuration is equivalent to at least one first configuration. Alternatively, it can be understood that the activation instruction is used to indicate the activation of at least some or all of the at least one second configuration, and the at least one first configuration is the part or all of the second configurations activated by the activation instruction. For example, if at least one second configuration includes three, the activation instruction can be used to activate two of the three second configurations; these two activated configurations are equivalent to at least one first configuration. As another example, if at least one second configuration includes three, the activation instruction can be used to activate all three second configurations; thus, these three second configurations are equivalent to at least one first configuration. In this case, it can be understood that at least one second configuration includes at least one first configuration. It is understood that in this case, Msg2 is the third information.

[0210] As an example, if each second configuration has a corresponding identifier, such as an index number or a number, the activation indication can include the identifier of the configuration to be activated. Since the identifier contains less information than a configuration, this can reduce the size of Msg2.

[0211] As another example, the activation indication may include, in addition to the identifier of the configuration to be activated, activation conditions for activating some or all of the second configuration. In embodiments of this application, the activation conditions may include, but are not limited to, the following three cases.

[0212] In the first scenario, the activation condition may include time information.

[0213] For example, the time information can be a time period, a preset duration, or a specific time window. This time information is used to indicate the activation of the corresponding second configuration when the time information is met. The time information is determined based on the at least one second moment or at least one first time window. For example, the time information can be a time window t1, so that the corresponding second configuration is activated when the current time window is time window t1. The time information can also be a preset duration, such as 200ms, indicating that the corresponding second configuration will be activated 200ms after the current time window. In this case, the activation condition can be understood as a delayed activation indication.

[0214] In the second scenario, the activation condition includes a data volume threshold, which is used to indicate that the total amount of small data to be transmitted by the terminal device is greater than or equal to the data volume threshold, and thus activates part or all of the second configuration.

[0215] For example, if a terminal device triggers RA-SDT upon determining that there is uplink small data, the terminal device can determine whether the total amount of the uplink small data to be transmitted is greater than or equal to a data volume threshold. If it is greater than or equal to the data volume threshold, the corresponding second configuration is activated. For example, if the data volume threshold is 100B, and the terminal device determines that the total amount of the uplink small data to be transmitted is greater than 100B, the corresponding second configuration can be activated.

[0216] The third scenario involves activation conditions including time information and data volume thresholds.

[0217] The time information is similar to that in the first case, and the data volume threshold is similar to that in the second case, so we will not repeat them here.

[0218] In this case, the activation condition is used to indicate that the corresponding second configuration is activated when the time information is met and the total amount of small data to be transmitted by the terminal device is greater than or equal to the data amount threshold; the corresponding second configuration is not activated when the time information is not met or the total amount of small data to be transmitted by the terminal device is less than the data amount threshold.

[0219] Additionally, it should be noted that the correspondence between the activation condition and the second configuration to be activated can be either one second configuration to be activated corresponding to one activation condition, or all the second configurations to be activated corresponding to the same activation condition; no restrictions are imposed here.

[0220] S704, The terminal device sends Msg3 to the network device and performs radio link monitoring on the serving cell based on at least one first configuration, and the network device receives Msg3.

[0221] S705: The network device sends Msg4 to the terminal device, and the terminal device receives Msg4.

[0222] S706: The network device sends downlink small data to the terminal device, and the terminal device receives the downlink small data.

[0223] Steps S704 to S706 are similar to steps S504 to S506, and will not be described again here.

[0224] In the embodiments shown in Figures 5 to 7, the wireless communication method provided in this application is described using RA-SDT as an example. The wireless communication method provided in this application will now be described in conjunction with CG-SDT.

[0225] Please refer to Figure 8, which is a flowchart of another example of the wireless communication method provided in the embodiments of this application. As shown in Figure 8, the flowchart includes the following steps:

[0226] S801. The terminal device sends a CG-SDT resource request message to the network device, and the network device receives the CG-SDT resource request message.

[0227] The CG-SDT resource request message is used to request CG-SDT configuration from network devices.

[0228] As an example, a terminal device can send a CG-SDT resource request message to a network device at any time while in the RRC_CONNECTED state; or, if the terminal device is in the RRC_CONNECTED state and determines that there may be small data in the future, it can send a CG-SDT resource request message to the network device; or, if the terminal device is in the RRC_CONNECTED state but determines that it will enter the RRC-INACTIVE state within a preset time, and in order to transmit small data in the RRC-INACTIVE state, the terminal device can send a CG-SDT resource request message to the network device.

[0229] S802, The network device sends a first response message to the terminal device, and the terminal device receives the first response message.

[0230] The first response message can be understood as a response message to the CG-SDT resource request message. This first response message carries CG-SDT configuration and at least one first configuration. The at least one first configuration is used to indicate the resources for the terminal device to perform radio link monitoring of the first cell during SDT. For example, it may include reference signals for radio link monitoring. The specific content is similar to the corresponding content in step S201 and will not be repeated here. The CG-SDT configuration is used to indicate information about the resources used by the terminal device for SDT, such as the time-frequency location and resource period of the resources used for SDT.

[0231] As an example, the CG-SDT configuration can also instruct the terminal device to perform SDT on RBs, or it can instruct the terminal device to perform SDT on RBs and not perform SDT on RBs. SDT transmission can only be performed on RBs indicated by the CG-SDT configuration, and the terminal device cannot perform SDT transmission on RBs not indicated by the CG-SDT configuration.

[0232] In this embodiment of the application, if the network device determines that the terminal device needs to enter the RRC_INACTIVE state, the first response message may be an RRC Release with suspend indication message, which includes CG-SDT configuration.

[0233] S803, the terminal device sends uplink small data to the network device on the resources indicated by the CG-SDT configuration, and performs radio link monitoring on the serving cell based on at least one first configuration, and the network device receives the uplink small data.

[0234] After receiving the RRC release message carrying the pause indication, the terminal device enters the RRC_INACTIVE state. When the terminal device has small data to transmit, it sends uplink small data to the network device on the resource indicated by the CG-SDT configuration.

[0235] Unlike CG-SDT in related technologies, in this embodiment, when the terminal device obtains at least one first configuration for radio link detection of the first cell through the first response message in step S802, the terminal device can perform radio link detection of the first cell during the process of sending small data between the terminal device and the network device. It can be understood that the first cell is the serving cell of the terminal device, and the terminal device can perform radio link monitoring of the serving cell based on the method in step S202, which will not be elaborated here.

[0236] The terminal device can perform radio link monitoring of the serving cell before sending uplink small data. If the measurement result indicates that the link quality of the serving cell is greater than or equal to the quality threshold, the terminal device will continue to perform CG-SDT, that is, it can continue to execute the subsequent steps of CG-SDT. Of course, the terminal device can also perform radio link monitoring of the serving cell after sending uplink small data, or the terminal device can perform the steps of sending uplink small data and monitoring the serving cell radio link simultaneously. In this embodiment, the execution order of the steps of sending uplink small data and monitoring the serving cell radio link is not restricted.

[0237] S804. The network device sends a second response message to the terminal device, and the terminal device receives the second response message.

[0238] As an example, if the terminal device or network device has no further need to transmit data, the RRC response message can also be used to indicate that the uplink small packet data transmission on the terminal device was successful and to instruct the terminal device to remain in the current RRC disconnected state. For example, the RRC response message could be an RRC Release message or another RRC message with the same function.

[0239] S805: The network device sends downlink small data to the terminal device, and the terminal device receives the downlink small data.

[0240] If a network device has downlink small data to send to a terminal device, the network device can send that downlink small data to the terminal device.

[0241] It should be noted that step S805 can also be combined with step S804 into one step. For example, the network device can send the downlink small data and the second response message to the terminal device together in step S804.

[0242] It should be noted that, in the example shown in Figure 8, the network device configures at least one first configuration to the terminal device through the first response message in step S802, that is, the first message sent by the network device to the terminal device. In this case, it can be understood that the third information is the first message sent by the network device to the terminal device. In other examples, the third information can also be other information in CG-SDT. For example, the third information can be the second response message in step S804 or the message used to send downlink data after the second response message in step S804 (e.g., the information used to carry downlink small data in step S805). The terminal device is instructed to provide at least one first configuration through the third information. After receiving at least one first configuration indicated by the network device, the terminal device can perform radio link monitoring on the serving cell.

[0243] As can be seen from any of the flowcharts in Figures 5-8 above, the wireless communication method provided in this application can be implemented by combining the SDT process in related technologies without adding new processes. The implementation method is simple and can improve the versatility of the solution.

[0244] In the foregoing embodiment, the example described is that the terminal device continues to use SDT for data transmission after performing radio link monitoring on the first cell. In other examples, the terminal device may trigger an RLF after performing radio link monitoring on the first cell. The following description, in conjunction with the accompanying drawings, illustrates an example of the terminal device triggering an RLF after performing radio link monitoring on the first cell.

[0245] Please refer to Figure 9, which is a flowchart of another example of the wireless communication method provided in the embodiments of this application. As shown in Figure 9, the flowchart includes the following steps:

[0246] S901, The network device sends third information to the terminal device, and the terminal device receives the third information.

[0247] S902. When the terminal device and the network device perform SDT, the terminal device performs radio link monitoring on the first cell based on at least one first configuration.

[0248] Steps S901 to S902 are similar to steps S201 to S202, and will not be described again here.

[0249] S903. If the measurement results of radio link monitoring of the first cell based on at least one first configuration meet the conditions, the terminal device performs the first operation.

[0250] It is understood that the wireless link here refers to the wireless link corresponding to the first cell in this embodiment. As described above, the measurement results of wireless link monitoring of the first cell are obtained by measuring the reference signal corresponding to each beam included in the first cell, or, it can be understood as measuring the reference signal of each beam included in all beams included in the first cell. Therefore, the measurement results of wireless link monitoring of the first cell may include the measurement results of each beam included in the first cell.

[0251] In this embodiment of the application, the measurement result includes information indicating the channel quality of the wireless link, which is similar to the corresponding content in step S202, and will not be repeated here. Therefore, the condition for determining whether to perform the first operation can also be a condition related to channel quality.

[0252] As an example, the conditions used to determine whether to perform the first operation may include, but are not limited to, the following:

[0253] First condition:

[0254] The measurement result for each of all beams is less than or equal to the first threshold.

[0255] In this case, the measurement result of each beam of all beams in the first cell is less than or equal to the first threshold. This can be understood as the measurement result of any one beam of all beams in the first cell being less than or equal to the first threshold. The first cell may include at least one beam.

[0256] As described in step S202, the information used to indicate the channel quality of the wireless link may include at least one of RSRP, RSRQ, SINR, and BLER, and the first threshold may be a threshold corresponding to the information used to indicate the channel quality of the wireless link. For example, when the monitoring result includes RSRP, the first threshold may be the RSRP threshold; when the monitoring result includes RSRQ, the first threshold may be the RSRQ threshold; when the monitoring result includes SINR, the first threshold may be the SINR threshold; or, when the monitoring result includes both RSRP and RSRQ, the first threshold may include both the RSRP threshold and the RSRQ threshold. Of course, when the monitoring result is other information, the first threshold may also be a threshold corresponding to other information, which will not be listed here.

[0257] As an example, taking the measurement result as RSRP and the first threshold as the first RSRP threshold, for example, the first cell includes 3 beams, labeled as beam A, beam B and beam C, wherein the reference signal corresponding to beam A is reference signal 1, the reference signal corresponding to beam B is reference signal 2, and the reference signal corresponding to beam C is reference signal 3, and the terminal device performs a measurement on the 3 reference signals.

[0258] The terminal device measures reference signal 1 on beam A and obtains RSRP measurement result 1. The terminal device measures reference signal 2 on beam B and obtains RSRP measurement result 2. The terminal device measures reference signal 3 on beam C and obtains RSRP measurement result 3. If all three RSRP measurement results are less than or equal to the first RSRP threshold, the terminal device performs the first operation. If one of the three RSRP measurement results is greater than the first RSRP threshold, the terminal device does not perform the first operation and can continue to perform SDT.

[0259] The second condition:

[0260] Within the first time period, the measurement result of each beam in all beams is less than or equal to the first threshold.

[0261] In this case, within the first time period, the measurement result of each beam of all beams in the first cell is less than or equal to the first threshold. This can also be understood as, within the first time period, the measurement result of any one beam of all beams in the first cell is less than or equal to the first threshold.

[0262] For an explanation of the first threshold in the second condition, please refer to the corresponding content in the first condition; it will not be repeated here.

[0263] In the second condition, the first duration can be a period of time, for example, a time period with the current time as the end time and a length of a preset duration, or a time period with both the start time and the end time before the current time and a length of a preset duration, or a time period with the current time as the start time and a length of a preset duration, or any time period with a preset duration. The preset duration can be agreed upon in advance by the terminal device and the network device, or it can be preset by the terminal device, or it can be determined in other ways, without any restrictions here.

[0264] Understandably, under both the first and second conditions, the process of the terminal device measuring the reference signals corresponding to each beam can be the same; only the conditions used to determine whether to perform the first operation are different. As an example, the terminal device measures the reference signals corresponding to each beam and obtains multiple measurement results. Under the first condition, all of these multiple measurement results are used to determine whether the conditions for performing the first operation are met. Under the second condition, only the measurement results within the first time period are used to determine whether the conditions for performing the first operation are met. For example, if the multiple measurement results include five measurement results, but one of them is not measured within the first time period, then the four measurement results obtained within the first time period are used to determine whether to perform the first operation.

[0265] For example, if the terminal device performs wireless link monitoring according to a preset monitoring period, the first duration may also include multiple monitoring periods. For example, the first duration may include the current monitoring period and the previous monitoring period, or the first duration may include the current monitoring period and at least two monitoring periods before the current monitoring period, or the first duration may also include at least two monitoring periods before the current monitoring period. In other words, the first duration may not include the current monitoring period.

[0266] For example, the first duration can also include at least one time window. A time window can include at least one unit of time or at least one time unit. For instance, it can include one unit of time or time unit, or it can include at least two units of time or time units, without limitation. It should be noted that in a communication system, the time domain resource used for data transmission can be one unit of time or one time unit, which can be a time slot, a system frame, a subframe, 1 second, or 1 millisecond, etc., without limitation.

[0267] Using the previous example, with the measurement result as RSRP and the first threshold as the first RSRP threshold, the first cell includes three beams, labeled as beam A, beam B and beam C, wherein the reference signal corresponding to beam A is reference signal 1, the reference signal corresponding to beam B is reference signal 2, and the reference signal corresponding to beam C is reference signal 3.

[0268] The terminal device measures the reference signal on each beam and obtains the RSRP measurement result 1' and measurement result 1 obtained by measuring the reference signal 1 on beam A within the first time period, the RSRP measurement result 2' and measurement result 2 obtained by measuring the reference signal 2 on beam B within the first time period, and the RSRP measurement result 3' and measurement result 3 obtained by measuring the reference signal 3 on beam C within the first time period, thus obtaining a total of 6 measurement results.

[0269] If all six RSRP measurements are less than or equal to the first RSRP threshold, the terminal device performs the first operation; if one of the six RSRP measurements is greater than the first RSRP threshold, the terminal device does not perform the first operation and can continue with SDT.

[0270] The third condition:

[0271] The average of the measurements across all beams is less than or equal to the second threshold.

[0272] It is understandable that if the first cell has only one beam, the measurement result for that beam is the average of the measurement results; if the first cell has multiple beams, the average can be obtained from the measurement results for each beam. It is also understandable that the measurement result for each beam is obtained by measuring the reference signal corresponding to that beam; therefore, the average of the measurement results for all beams can also be understood as the average of the measurement results for all reference signals.

[0273] The explanation of the second threshold can be found in the section on the first condition, which describes the first threshold; it will not be repeated here. It should be noted that the first and second thresholds can be the same or different; this is not a restriction.

[0274] The measurement result is taken as RSRP and the first threshold is taken as the first RSRP threshold. The first cell includes three beams, labeled as beam A, beam B and beam C. The reference signal corresponding to beam A is reference signal 1, the reference signal corresponding to beam B is reference signal 2 and the reference signal corresponding to beam C is reference signal 3. The terminal device monitors the three reference signals once.

[0275] The terminal device measures reference signal 1 on beam A and obtains RSRP measurement result 1. The terminal device measures reference signal 2 on beam B and obtains RSRP measurement result 2. The terminal device measures reference signal 3 on beam C and obtains RSRP measurement result 3. Based on measurement result 1, measurement result 2, and measurement result 3, the average value of the measurement results on the three beams is obtained. If the average value of the three measurement results is less than or equal to the second RSRP threshold, the terminal device performs the first operation. If the average value of the three measurement results is greater than the second RSRP threshold, the terminal device does not perform the first operation, and the terminal device can continue to perform SDT.

[0276] The fourth condition:

[0277] Within the second time period, the average value of the measurements on all beams is less than or equal to the second threshold.

[0278] The explanations regarding the average value of the measurement results and the second threshold are similar to those in the third condition and will not be repeated here. Unlike the third condition, the fourth condition includes a second duration. The explanation of the second duration can refer to the explanation of the first duration in the second condition and will not be repeated here. It should be noted that the second duration can be the same as or different from the first duration; there are no restrictions here.

[0279] With the measurement result as RSRP and the second threshold as the second RSRP threshold, the first cell includes three beams, labeled as beam A, beam B and beam C. The reference signal corresponding to beam A is reference signal 1, the reference signal corresponding to beam B is reference signal 2, and the reference signal corresponding to beam C is reference signal 3.

[0280] The terminal device measures the reference signal on each beam, obtaining the RSRP measurement result 1' and measurement result 1 obtained by measuring the reference signal 1 on beam A during the second time period, the RSRP measurement result 2' and measurement result 2 obtained by measuring the reference signal 2 on beam B during the second time period, and the RSRP measurement result 3' and measurement result 3 obtained by measuring the reference signal 3 on beam C during the second time period, thus acquiring a total of 6 measurement results.

[0281] If the average of the six RSRP measurements is less than or equal to the second RSRP threshold, the terminal device performs the first operation; if the average of the six RSRP measurements is greater than the second RSRP threshold, the terminal device does not perform the first operation and can continue with SDT.

[0282] Fifth condition:

[0283] The average of the measurements preceding the Nth position in the sorted at least one measurement result is less than or equal to a third threshold, where N is a positive integer. This at least one measurement result corresponds to all beams included in the first cell. Since the measurement result for each beam is obtained by measuring the reference signal corresponding to the beam, this at least one measurement result can also be understood as the measurement result on all reference signals.

[0284] For example, each beam can correspond to at least one measurement result. If the first cell has one beam, then the at least one measurement result is the at least one measurement result corresponding to that beam. If the first cell has at least two beams, then the at least one measurement result is multiple measurement results corresponding to at least two beams.

[0285] Unlike the fourth condition, the fifth condition does not require averaging the measurement results on each beam or each reference signal. Instead, it selects the measurement results on the beam with better channel quality and averages them. The beam with better channel quality can be understood as at least one measurement result that is in the top N positions after sorting the measurement results from largest to smallest. For example, if N is 3, the at least one measurement result includes 5 measurement results on 5 beams, with one measurement result corresponding to one beam. Then, after sorting the measurement results from largest to smallest, the top 3 measurement results are obtained, and the average of the top 3 measurement results is calculated.

[0286] In this way, the terminal device does not need to perform calculations on all the measurement results, which reduces the amount of computation required by the terminal device.

[0287] The description of the third threshold can be found in the section on the first threshold in the first condition, and will not be repeated here. It should be noted that the third, first, and second thresholds can be completely identical, or partially identical. For example, the first and second thresholds can be the same, while the third and first thresholds are different; or the first and second thresholds can be different, while the third and first thresholds are the same; or the first and second thresholds can be different, while the third and second thresholds are the same; or the third, first, and second thresholds can all be different, without any restrictions.

[0288] Following the previous example, with the measurement result as RSRP and the first threshold as the first RSRP threshold, the first cell includes 5 beams, labeled as beam A, beam B, beam C, beam D and beam E. The reference signal corresponding to beam A is reference signal 1, the reference signal corresponding to beam B is reference signal 2, the reference signal corresponding to beam C is reference signal 3, the reference signal corresponding to beam D is reference signal 4, and the reference signal corresponding to beam E is reference signal 5. The terminal device performs a measurement on the 5 reference signals, and the value of N is 3.

[0289] The terminal device measures reference signal 1 on beam A, obtaining RSRP measurement result 1; the terminal device measures reference signal 2 on beam B, obtaining RSRP measurement result 2; the terminal device measures reference signal 3 on beam C, obtaining RSRP measurement result 3; the terminal device measures reference signal 4 on beam D, obtaining RSRP measurement result 4; and the terminal device measures reference signal 5 on beam E, obtaining RSRP measurement result 5. Measurement results 1 through 5 are sorted according to their RSRP values ​​from largest to smallest, resulting in the top three measurement results: measurement result 1, measurement result 3, and measurement result 4. The average value of these three beam measurement results is then obtained. If the average value of these three measurement results is less than or equal to a third RSRP threshold, the terminal device performs the first operation; if the average value of these three measurement results is greater than the third RSRP threshold, the terminal device does not perform the first operation and can continue with SDT.

[0290] Sixth condition:

[0291] Within the third time period, the average value of the measurements preceding the Nth position in at least one of the sorted measurements is less than or equal to the third threshold.

[0292] The explanations for the average value of the measurement results before the Nth position and the third threshold are similar to those in the fifth condition and will not be repeated here. Unlike the fifth condition, the sixth condition includes a third duration. The explanation of the third duration can refer to the explanation of the first duration in the second condition and will not be repeated here. It should be noted that the third, second, and first durations can be the same, different, or partially the same. If the three durations are partially the same, the first and second durations can be the same, but the third duration can be different from the first duration; or, the first and third durations can be the same, but the second duration can be different from the first duration; or, the second and third durations can be the same, but the first duration can be different from the second duration. No restrictions are imposed here.

[0293] Following the previous example, with the measurement result as RSRP and the first threshold as the first RSRP threshold, the first cell includes 5 beams, labeled as beam A, beam B, beam C, beam D and beam E. The reference signal corresponding to beam A is reference signal 1, the reference signal corresponding to beam B is reference signal 2, the reference signal corresponding to beam C is reference signal 3, the reference signal corresponding to beam D is reference signal 4, and the reference signal corresponding to beam E is reference signal 5. The value of N is 3.

[0294] The terminal equipment measures the reference signal on each beam, obtaining the RSRP measurement results 1' and 1 for reference signal 1 measured on beam A during the third time period; the RSRP measurement results 2' and 2 for reference signal 2 measured on beam B during the third time period; the RSRP measurement results 3' and 3 for reference signal 3 measured on beam C during the third time period; the RSRP measurement results 4' and 4 for reference signal 4 measured on beam D during the third time period; and the RSRP measurement results 5' and 5 for reference signal 5 measured on beam E during the third time period. The measurement results 1 through 5 and 1' through 5' are sorted according to their RSRP values ​​from largest to smallest, resulting in the top three measurement results: measurement result 1, measurement result 3, and measurement result 4'. The average value of these three beam measurements is then calculated. If the average value is less than or equal to the third RSRP threshold, the terminal device performs the first operation. If the average value is greater than the third RSRP threshold, the terminal device does not perform the first operation and can continue with SDT.

[0295] In the above example, the results are obtained by sorting the measurement results of the reference signal. In other embodiments, the N beams with the best quality among multiple beams can be determined first, and then the average value of the measurement results of these N beams can be calculated. It is then determined whether the average value is less than or equal to the third threshold. If the average value is less than or equal to the third threshold, the terminal performs the first operation.

[0296] Following the example above, after measuring results 1 to 5 and 1' to 5', the average value of the measurement results of the five beams within the third time period is first obtained. For example, the average of measurement results 1 and 1' is calculated to obtain the average value of the measurement results of beam A, the average of measurement results 2 and 2' is calculated to obtain the average value of the measurement results of beam B, and so on, to obtain the average value of the measurement results of the five beams. Then, the average values ​​of the measurement results of these five beams are sorted from largest to smallest to obtain the average value of the top three beam measurement results, for example, the average value of the measurement results of beam A, beam B, and beam C. Then, these three average values ​​are averaged again, and it is determined whether the result of the second average calculation is less than or equal to the third RSRP threshold. If the result of the second average calculation is less than or equal to the third RSRP threshold, the terminal device performs the first operation; if the result of the second average calculation is greater than the third RSRP threshold, the terminal device does not perform the first operation, and the terminal device can continue to perform SDT.

[0297] The above are examples of several conditions for determining whether to perform the first operation in the embodiments of this application. Of course, the conditions for determining whether to perform the first operation may also include other situations, which will not be listed here.

[0298] It should be noted that the conditions used to determine whether to perform the first operation can be pre-existing in the terminal device, or can be agreed upon in the protocol, or can be agreed upon by the terminal device and the network device; no restrictions are imposed here.

[0299] As an example, the condition for determining whether to perform the first operation can also be carried in the third information in step S901 and indicated to the terminal device through the third information. In this case, the third information also includes parameters corresponding to the condition, the parameters including duration and / or threshold, and the parameters included in the third information are different depending on the condition.

[0300] For example, the first condition is when the condition includes a measurement result on each of the at least one beam that is less than or equal to a first threshold, and the parameter includes the first threshold;

[0301] The second condition includes the condition that, within a first duration, the measurement result on each of the at least one beam is less than or equal to a first threshold, and the parameters include the first threshold and the first duration.

[0302] The third condition is when the average value of the measurement results on the at least one beam is less than or equal to a second threshold, and the first parameter includes the second threshold.

[0303] The fourth condition is when the average value of the measurement results on at least one beam is less than or equal to a second threshold within the second duration, and the parameters include the second threshold and the second duration.

[0304] The fifth condition is when the average of the measurements preceding the Nth position in at least one sorted measurement result is less than or equal to a third threshold, and the parameter includes the third threshold.

[0305] The sixth condition is defined as follows: within the third time period, the average value of the measurements preceding the Nth position in the sorted at least one measurement result is less than or equal to the third threshold. The parameters include the third threshold and the third time period.

[0306] It should also be noted that in the fifth and sixth conditions, the parameter may also include N, which is not limited here.

[0307] The first operation will be explained below.

[0308] In this embodiment of the application, the first operation is used to declare a Radio Link Failure (RLF) occurring in the first cell. When the measurement results of the terminal device's radio link monitoring of the first cell meet the conditions, it indicates that the channel quality of the first cell is poor, and thus the terminal device can determine that an RLF has occurred in the first cell. In this case, the terminal device can execute the first operation.

[0309] In this embodiment of the application, the first operation includes at least one of the following operations:

[0310] Stop or suspend the SDT transmission;

[0311] When the terminal device is in the RRC_INACTIVE state, it switches to the idle state;

[0312] Community re-selection;

[0313] Choose the residential community to stay in;

[0314] Send first information to the network device, the first information being used to indicate that the RLF has occurred in the first cell;

[0315] Send a second message to the network device, the second message including the measurement result.

[0316] Specifically, when the measurement results of the terminal device's radio link monitoring of the first cell meet the conditions, the terminal device can stop or suspend SDT transmission. For example, the terminal device can stop sending small data to the network device through SDT resources. In this way, when the network device does not receive small data sent by the terminal device for a period of time, it will know that an RLF has occurred in the first cell.

[0317] Alternatively, the terminal device can send a stop or suspension instruction to the network device through SDT resources. Upon receiving the stop or suspension instruction, the network device will know that the first cell has sent an RLF. If the received instruction is a stop instruction, the network device can also send an RRC release message to the terminal device. When the terminal device receives the RRC release message, it will terminate SDT.

[0318] As another example, if the measurement results of the terminal device's radio link monitoring of the first cell meet the conditions, it indicates that the radio link quality of the first cell is poor. If SDT continues at this time, the network device may not be able to receive the small data, or the bit error rate of the received small data may be high, etc., causing unnecessary uplink and downlink transmissions. In this case, the terminal device can determine whether it is currently in the RRC_INACTIVE state. If the terminal device is currently in the RRC_INACTIVE state, it can switch to the idle state, thereby further saving the terminal device's power consumption.

[0319] As another example, the terminal device can also determine whether the link quality of the first cell meets the criteria for cell reselection or for selecting a cell to stay in. If the criteria for cell reselection are met, the terminal device can trigger the cell reselection process to perform cell reselection; if the criteria for selecting a cell to stay in are met, the terminal device can trigger the process for selecting a cell to stay in. The criteria for cell reselection and the criteria for selecting a cell to stay in are similar to those in related technologies and will not be elaborated here.

[0320] As another example, if the terminal device's measurement results of the radio link monitoring of the first cell meet the conditions, the terminal device can also directly send a first message indicating that an RLF has occurred in the first cell to the network device. Upon receiving this first message, the network device will then know that an RLF has occurred in the first cell. Alternatively, the terminal device can send its measurement results of the first cell to the network device. After obtaining the measurement results, the network device can confirm whether an RLF has occurred in the first cell based on these results. For example, it can confirm whether the measurement results meet the aforementioned conditions. If the conditions are met, then the network device confirms that an RLF has occurred in the first cell.

[0321] When the measurement result meets the aforementioned conditions, the terminal device may execute one or more of the above-mentioned operations, without limitation. Furthermore, when the terminal device executes multiple different operations, the execution order of the operations is not restricted. For example, if the first operation includes stopping SDT transmission and sending first information to the network device to indicate that the first cell has experienced the RLF, the terminal device may first stop SDT transmission and then send the first information to the network device; alternatively, the terminal device may first send the first information and then stop SDT transmission; or, the terminal device may simultaneously stop SDT transmission and send the first information. No limitation is imposed in this embodiment.

[0322] Furthermore, it should be noted that even if the measurement result does not meet the aforementioned conditions, the terminal device can continue to perform SDT, thereby allowing the duration of the SDT between the terminal device and the network device to be greater than or equal to a duration threshold, and / or allowing the amount of data transmitted during the SDT between the terminal device and the network device to be greater than or equal to a data volume threshold. Moreover, since the terminal device performs SDT transmission when the measurement result does not meet the conditions, i.e., the measurement result indicates that the wireless link quality is good, the transmission performance of the terminal device for data transmission can be guaranteed. It should be noted that the duration threshold can be determined based on the transmission duration of SDT in related technologies. For example, the transmission duration of RA-SDT in related technologies is typically x wireless frames, so the duration threshold can be set to x wireless frames. The data volume threshold can be determined based on the total amount of data transmitted by SDT in related technologies. For example, the total amount of data transmitted by RA-SDT in related technologies is yKb, so the data volume threshold can be set to yKb. No restrictions are placed on the values ​​or determination methods of the duration threshold and / or the data volume threshold. Since the terminal device determines that the measurement result does not meet the conditions, it indicates that the link quality of the first cell is good. Therefore, the terminal device can continue to perform SDT, which can increase the transmission duration of SDT. As the transmission duration increases, the total amount of data transmitted will also increase accordingly, thereby achieving the effect of enhanced SDT.

[0323] In the above technical solution, by monitoring the wireless link of the first cell and judging whether the measurement results meet the conditions, the terminal device can perform SDT when the link quality is good, which can ensure the data transmission performance of SDT. Furthermore, when the measurement results of wireless link monitoring meet the conditions, the terminal device can perform relevant operations, thereby triggering RLF during the SDT process. This can reduce unnecessary uplink and downlink transmissions caused by link quality deterioration and further save the energy consumption of the terminal device.

[0324] In the example shown in Figure 9, the condition for determining whether to perform the first operation is pre-stored by the terminal device or indicated by third information is taken as an example. In other embodiments, the condition may be indicated to the terminal device by the network device through other information. Such embodiments will be described below.

[0325] Please refer to Figure 10, which is a flowchart of another example of a wireless communication method provided in an embodiment of this application. As shown in Figure 10, the flowchart includes the following steps:

[0326] S1001, The network device sends third information to the terminal device, and the terminal device receives the third information.

[0327] Step S1001 is similar to step S901, and will not be described again here.

[0328] S1002, The network device sends the fifth information to the terminal device, and the terminal device receives the fifth information.

[0329] In this embodiment, the fifth information includes parameters corresponding to the conditions used to determine whether to perform the first operation, and the parameters include duration and / or threshold. The description of the parameters is similar to the corresponding content in step S902, and will not be repeated here.

[0330] In the first example, the fifth message can be newly added information. As an example, it can be a dedicated signaling message added by the network device to send to the terminal device, such as an RRC message. Alternatively, the fifth message can also be a message added by the network device to send downlink data to the terminal device. There are no restrictions here.

[0331] In a second example, the fifth piece of information can also reuse information from related technologies. For instance, the fifth piece of information can be a system message from a network device, which indicates the parameter. This system message can be any one of MIB, SIB1 to SIB9. For example, one or more fields can be added to any one of MIB, SIB1 to SIB9 to indicate the parameter. Alternatively, a new piece of information can be added to the system message, such as SIB11, to indicate the parameter. In this embodiment, no restrictions are placed on how the network device indicates the parameter through system messages.

[0332] For example, the fifth piece of information can also be dedicated signaling for the terminal device, indicating the parameters. This dedicated signaling can be sent by the network device to the terminal device after the network device or terminal device triggers SDT. For example, when triggering RA-SDT, the dedicated signaling can be Msg2 or Msg4, or a message used to send downlink data; when triggering CG-SDT, the dedicated signaling can be the first downlink message sent by the network device to the terminal device, or a message containing downlink data sent by the network device to the terminal device. For example, it could be the first message from the network device to the terminal device containing downlink data.

[0333] As can be seen from the second example above, the fifth information can be the same as the third information. In this case, steps S1001 and S1002 can be combined into one step, and the embodiments shown in Figures 9 and 10 are the same.

[0334] Of course, when both the third and fifth information reuse information from related technologies, the third and fifth information can also be different information. For example, the third information can be a system message, and the fifth information can be a terminal device-specific signaling; or the fifth information can be a system message, and the third information can be a terminal device-specific signaling; or both the third and fifth information can be terminal device-specific signaling, but not the same message. For example, when triggering RA-SDT, the third information can be Msg2, and the fifth information can be Msg4; or the third information can be Msg4, and the fifth information can be a message used to send downlink data; or the fifth information can be Msg2, and the third information can be Msg4; or the fifth information can be Msg4, and the third information can be a message used to send downlink data; or the fifth information can be Msg2, and the third information can be Msg4; or the fifth information can be Msg4, and the third information can be a message used to send downlink data. For another example, when triggering CG-SDT, the third information can be the first downlink message sent by the network device to the terminal device, and the fifth information can be a message of downlink data sent by the network device to the terminal device; or the fifth information can be the first downlink message sent by the network device to the terminal device, and the third information can be a message of downlink data sent by the network device to the terminal device. No restrictions are imposed here.

[0335] Furthermore, when the parameter included in the fifth information is a threshold, the fifth information can indicate the threshold through an identifier. For example, the terminal device can pre-store identifiers corresponding to different thresholds, and the fifth information can include the identifier of the corresponding threshold, such as an index number or a number. When the parameter included in the fifth information is duration, the fifth information can indicate the duration through an identifier. For example, the terminal device can pre-store identifiers corresponding to different durations, and the fifth information can include the identifier of the corresponding duration, such as an index number or a number. Alternatively, the fifth information can indicate the duration through an offset and an identifier. The offset can be the offset between the start time of the duration and a preset time, which can be the current time. Of course, the above parameters can also be indicated in other ways, and there are no restrictions here.

[0336] In Figure 10, we will take the example of the fifth piece of information being different from the third piece of information to illustrate the point.

[0337] S1003. When the terminal device and the network device perform SDT, the terminal device performs radio link monitoring on the first cell based on at least one first configuration.

[0338] S1004. If the measurement results of radio link monitoring of the first cell based on at least one first configuration meet the conditions, the terminal device performs the first operation.

[0339] Steps S1003 to S1004 are similar to steps S902 to S903, and will not be described again here.

[0340] In the above technical solution, the network device can use the fifth information to indicate in real time the parameters of the conditions for determining whether to perform the first operation to the terminal device, which can improve the flexibility of information indication.

[0341] The wireless communication method in the embodiments of this application will be described below by combining the two SDT schemes, RA-SDT and CG-SDT.

[0342] Please refer to Figure 11, which is a flowchart of another example of the wireless communication method provided in the embodiments of this application. In Figure 11, taking RA-SDT with four-step random access as an example, the flowchart includes the following steps:

[0343] S1101, The network device sends a broadcast message, and the terminal device receives the broadcast message.

[0344] S1102. The terminal device sends Msg1 to the network device using random access resources, and the network device receives Msg1.

[0345] S1103. The network device sends Msg2 to the terminal device, and the terminal device receives Msg2.

[0346] In this embodiment of the application, Msg2 indicates at least one first configuration and a parameter in the condition, that is, Msg2 is third information.

[0347] S1104. The terminal device sends Msg3 to the network device and performs radio link monitoring on the first cell based on at least one first configuration. The network device receives Msg3.

[0348] S1105. The network device sends Msg4 to the terminal device, and the terminal device receives Msg4.

[0349] Steps S1101 to S1105 are similar to steps S501 to S505, and will not be described again here.

[0350] S1106. If the measurement results of radio link monitoring of the first cell based on at least one first configuration meet the conditions, the terminal device performs the first operation.

[0351] Step S1106 is similar to step S902 and will not be described again here. When the measurement result of the terminal device's radio link monitoring of the first cell meets the conditions, it indicates that the channel quality of the first cell is poor. In step S1105, taking the terminal device stopping the SDT transmission as an example, after the terminal device stops the SDT transmission, the network device does not need to send downlink small data.

[0352] Please refer to Figure 12, which is a flowchart of another example of the wireless communication method provided in the embodiments of this application. In Figure 12, taking SDT as a two-step random access RA-SDT as an example, as shown in Figure 12, the flowchart includes the following steps:

[0353] S1201. The network device sends a broadcast message to the terminal device, and the terminal device receives the broadcast message.

[0354] S1202, The terminal device sends MsgA to the network device, and the network device receives MsgA.

[0355] In this embodiment of the application, MsgA indicates at least one first configuration and a parameter in the condition, i.e., MsgB is third information.

[0356] S1203, the network device sends MsgB to the terminal device, the terminal device receives MsgB, and performs radio link monitoring on the first cell based on at least one first configuration.

[0357] Steps S1201 to S1203 are similar to steps S601 to S603, and will not be described again here.

[0358] S1204. If the measurement results of radio link monitoring of the first cell based on at least one first configuration meet the conditions, the terminal device performs the first operation.

[0359] Step S1204 is similar to step S902 and will not be described again here. When the measurement result of the terminal device's radio link monitoring of the first cell meets the conditions, it indicates that the channel quality of the first cell is poor. In step S1104, taking the terminal device stopping the SDT transmission as an example, after the terminal device stops the SDT transmission, the network device does not need to send downlink small data.

[0360] The examples shown in Figures 11 and 12 illustrate the wireless communication method provided in this application using RA-SDT as an example. The wireless communication method provided in this application will now be described in conjunction with CG-SDT.

[0361] Please refer to Figure 13, which is a flowchart of another example of a wireless communication method provided in an embodiment of this application. As shown in Figure 13, the flowchart includes the following steps:

[0362] S1301, The terminal device sends a CG-SDT resource request message to the network device, and the network device receives the CG-SDT resource request message.

[0363] S1302, The network device sends a first response message to the terminal device, and the terminal device receives the first response message.

[0364] In this embodiment of the application, at least one first configuration and parameters in the conditions are indicated by a first response message, that is, the first response message is third information.

[0365] S1303, The terminal device sends uplink small data to the network device on the resources indicated by the CG-SDT configuration, and performs radio link monitoring on the first cell based on at least one first configuration, and the network device receives the uplink small data.

[0366] S1304. The network device sends a second response message to the terminal device, and the terminal device receives the second response message.

[0367] Steps S1301 to S1304 are similar to steps S801 to S804, and will not be described again here.

[0368] S1305. If the measurement results of radio link monitoring of the first cell based on at least one first configuration meet the conditions, the terminal device performs the first operation.

[0369] Step S1305 is similar to step S902 and will not be described again here. When the measurement result of the terminal device's radio link monitoring of the first cell meets the conditions, it indicates that the channel quality of the first cell is poor. In step S1305, taking the terminal device stopping the SDT transmission as an example, after the terminal device stops the SDT transmission, the network device does not need to send downlink small data.

[0370] In the above technical solution, by adding a wireless link monitoring mechanism during the SDT process, it can be ensured that the terminal device performs SDT when the link quality is good, thus guaranteeing the data transmission performance of SDT. Furthermore, when the measurement result of wireless link monitoring indicates poor link quality, the terminal device can trigger RLF during the SDT process, thereby reducing unnecessary uplink and downlink transmissions caused by link quality deterioration and further saving the energy consumption of the terminal device.

[0371] It should be understood that although the steps in the above flowcharts are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the above flowcharts may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed in the same time window, but can be executed in different time windows. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0372] The above primarily describes the solutions provided in the embodiments of this application from the perspective of interaction between network devices and terminals. It is understood that, to achieve the above functions, network devices or terminals may include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0373] In the case of using integrated units (modules), Figure 14 shows a possible exemplary block diagram of the terminal device involved in the embodiments of this application, which may exist in the form of software. The network device 1400 may include: a first processing unit 1401 and a first transceiver unit 1402. The first processing unit 1401 is used to control and manage the actions of the terminal device 1400. The first transceiver unit 1402 is used to support communication between the terminal device 1400 and other device entities, such as communication with network devices. Optionally, the first transceiver unit 1402 may include a receiving unit and / or a sending unit, respectively used to perform receiving and sending operations. The terminal device 1400 may also include a storage unit for storing the program code and / or data of the terminal device 1400.

[0374] The first processing unit 1401 may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments disclosed in this application. The first transceiver unit 1402 may be a communication interface, transceiver, or transceiver circuit, etc., wherein the communication interface is a general term, and in a specific implementation, the communication interface may include multiple interfaces. The storage unit may be a memory.

[0375] The terminal device 1400 can be the terminal device in any of the above embodiments, or it can be a chip disposed in the terminal device. The first processing unit 1401 can support the terminal device 1400 in performing the actions of the terminal device in the method examples above.

[0376] In this embodiment of the application, the first processing unit 1401 is configured to perform radio link monitoring on a first cell based on at least one first configuration when controlling the first transceiver unit 1402 to perform small data transmission SDT with the network device. The at least one first configuration includes a reference signal for performing radio link monitoring, and the first cell includes the serving cell of the terminal device.

[0377] In one possible implementation, if the measurement result of the first processing unit 1401 performing radio link monitoring on the first cell based on at least one first configuration does not meet the conditions, the duration of the SDT between the first transceiver unit 1402 and the network device is controlled to be greater than or equal to a duration threshold, and / or the amount of data between the first transceiver unit 1402 and the network device is controlled to be greater than or equal to a data amount threshold.

[0378] In one possible implementation, the first processing unit 1401 is further configured to:

[0379] If the measurement results of radio link monitoring of the first cell based on at least one first configuration meet the conditions, a first operation is performed, the first operation including at least one of the following operations:

[0380] Stop or suspend the SDT transmission;

[0381] When the terminal device is in an inactive state, it switches to an idle state;

[0382] Community re-selection;

[0383] Choose the residential community to stay in;

[0384] The first transceiver unit 1402 is controlled to send first information to the network device, the first information being used to indicate that the RLF has occurred in the first cell;

[0385] The first transceiver unit 1402 is controlled to send second information to the network device, the second information including the measurement result.

[0386] In one possible implementation, the measurement results include information indicating the channel quality of the wireless link, and the conditions include conditions associated with the channel quality.

[0387] In one possible implementation, the reference signal includes a reference signal corresponding to each beam, each beam being one of all beams included in the first cell, and the measurement result is obtained by measuring the reference signal corresponding to each beam on each beam.

[0388] In one possible implementation, the conditions include at least one of the following:

[0389] The measurement result on each of all the beams is less than or equal to the first threshold;

[0390] Within a first time period, the measurement result on each of all beams is less than or equal to a first threshold.

[0391] The average value of the measurements on all the beams is less than or equal to the second threshold;

[0392] Within the second time period, the average value of the measurements on all beams is less than or equal to the second threshold.

[0393] The average value of the measurements preceding the Nth position in at least one sorted measurement result is less than or equal to a third threshold, where N is a positive integer; the at least one measurement result is the measurement result corresponding to all the beams;

[0394] Within the third time period, the average value of the measurements preceding the Nth position in at least one of the sorted measurements is less than or equal to the third threshold.

[0395] In one possible implementation, the first transceiver unit 1402 is further configured to:

[0396] Receive third information sent by a network device, the third information being used to indicate the at least one first configuration.

[0397] In one possible implementation, the third information is a system message, and the first transceiver unit 1402 is used for:

[0398] Receive system messages broadcast by the network device.

[0399] In one possible implementation, the SDT is based on the random access procedure, and the third information is at least one of the following:

[0400] Msg2 during the random access process;

[0401] Msg4 during the random access process;

[0402] The message used to send downlink data during the random access process.

[0403] In one possible implementation, the first transceiver unit 1402 is further configured to:

[0404] The network device receives fourth information, which indicates at least one second configuration for wireless link monitoring.

[0405] In one possible implementation, the third information includes an activation indication for indicating the activation of at least some or all of the at least one second configuration, wherein the at least one first configuration is the part or all of the second configuration activated by the activation indication.

[0406] In one possible implementation, the third information further includes activation conditions for activating part or all of the second configuration, the activation conditions including time information and / or a data volume threshold, the data volume threshold being used to indicate that the partial or all of the second configuration is activated when the total amount of small data to be transmitted by the terminal device is greater than or equal to the data volume threshold.

[0407] In one possible implementation, the SDT is an SDT based on uplink unlicensed CG resources, and the third information is at least one of the following:

[0408] The first message sent by the network device to the terminal device;

[0409] The network device sends a message containing downlink data to the terminal device.

[0410] In one possible implementation, the third information further includes parameters corresponding to the conditions, including duration and / or threshold.

[0411] In one possible implementation, the parameter includes the first threshold if the condition includes a measurement result on each of all beams being less than or equal to a first threshold.

[0412] The parameter includes the first threshold and the first duration, provided that the measurement result on each of the all beams is less than or equal to a first threshold within a first duration.

[0413] The first parameter includes the second threshold when the condition includes the fact that the average value of the measurement results on all beams is less than or equal to the second threshold.

[0414] The parameters include the second threshold and the second duration, provided that the average value of the measurements on all beams is less than or equal to the second threshold within the second duration.

[0415] The parameter includes the third threshold if the average of the measurements preceding the Nth position in at least one sorted measurement result is less than or equal to the third threshold.

[0416] The parameter includes the third threshold and the third duration, provided that, within the third duration, the average value of the measurements preceding the Nth position in the sorted at least one measurement is less than or equal to the third threshold.

[0417] In one possible implementation, the first transceiver unit 1402 is further configured to:

[0418] Receive fifth information sent by the network device, the fifth information including parameters corresponding to the condition, the parameters including duration and / or threshold;

[0419] Wherein, the parameter includes the first threshold, provided that the condition includes a measurement result on each of the all beams being less than or equal to a first threshold.

[0420] The parameter includes the first threshold and the first duration, provided that the measurement result on each of the all beams is less than or equal to a first threshold within a first duration.

[0421] The first parameter includes the second threshold when the condition includes the fact that the average value of the measurement results on all beams is less than or equal to the second threshold.

[0422] The parameters include the second threshold and the second duration, provided that the average value of the measurements on all beams is less than or equal to the second threshold within the second duration.

[0423] The parameter includes the third threshold if the average of the measurements preceding the Nth position in at least one sorted measurement result is less than or equal to the third threshold.

[0424] The parameter includes the third threshold and the third duration, provided that, within the third duration, the average value of the measurements preceding the Nth position in the sorted at least one measurement is less than or equal to the third threshold.

[0425] In the case of using integrated units (modules), Figure 15 shows a possible exemplary block diagram of the network device involved in the embodiments of this application. The network device 1500 may exist in the form of software. The network device 1500 may include: a second processing unit 1501 and a second transceiver unit 1502. The second processing unit 1501 is used to control and manage the operation of the network device 1500. The second transceiver unit 1502 is used to support communication between the network device 1500 and other device entities, such as communication with terminal devices. Optionally, the second transceiver unit 1502 may include a receiving unit and / or a sending unit, respectively used to perform receiving and sending operations. The network device 1500 may also include a storage unit for storing the program code and / or data of the network device 1500.

[0426] The second processing unit 1501 may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments disclosed in this application. The second transceiver unit 1502 may be a communication interface, transceiver, or transceiver circuit, etc., wherein the communication interface is a general term, and in a specific implementation, the communication interface may include multiple interfaces. The storage unit may be a memory.

[0427] The network device 1500 can be a network device in any of the above embodiments, or it can be a chip disposed in the network device. The second processing unit 1501 can support the network device 1500 in performing the actions of the network device in the method examples above.

[0428] In this embodiment of the application, the second transceiver unit 1502 is used to perform small data transmission SDT with the terminal device under the control of the second processing unit 1501;

[0429] Wherein, when the terminal device performs SDT, it performs radio link monitoring on a first cell based on at least one first configuration, wherein the at least one first configuration includes a reference signal for performing radio link monitoring, and the first cell includes the serving cell of the terminal device.

[0430] In one possible implementation, if the measurement result of the wireless link monitoring of the first cell by the terminal device based on at least one first configuration does not meet the conditions, the second transceiver unit 1502 is controlled to perform the SDT with the terminal device for a duration greater than or equal to a duration threshold, and / or the amount of data performed by the second transceiver unit 1502 with the terminal device in the SDT is controlled to be greater than or equal to a data amount threshold.

[0431] In one possible implementation, the measurement results include information indicating the channel quality of the wireless link, and the conditions include conditions associated with the channel quality.

[0432] In one possible implementation, the reference signal includes a reference signal corresponding to each beam, wherein each beam is one of all beams included in the first cell;

[0433] If the measurement result of the wireless link monitoring of the first cell based on at least one first configuration meets the conditions, the terminal device performs a first operation, wherein the measurement result is obtained by the terminal device measuring the reference signal corresponding to each beam on each beam;

[0434] The first operation includes at least one of the following operations:

[0435] The terminal device stops or suspends the SDT transmission;

[0436] When the terminal device is in an inactive state, the terminal device switches to an idle state;

[0437] The terminal device performs cell reselection;

[0438] The terminal device selects the cell to reside in;

[0439] The second transceiver unit 1502 is also configured to perform at least one of the following operations:

[0440] The terminal device sends first information, which indicates that the RLF has occurred in the first cell.

[0441] The terminal device sends a second message, which includes the measurement result.

[0442] In one possible implementation, the conditions include at least one of the following:

[0443] The measurement result on each of all the beams is less than or equal to the first threshold;

[0444] Within a first time period, the measurement result on each of all beams is less than or equal to a first threshold.

[0445] The average value of the measurements on all the beams is less than or equal to the second threshold;

[0446] Within the second time period, the average value of the measurements on all beams is less than or equal to the second threshold.

[0447] The average value of the measurements preceding the Nth position in at least one sorted measurement result is less than or equal to a third threshold, where N is a positive integer; the at least one measurement result is the measurement result corresponding to all the beams;

[0448] Within the third time period, the average value of the measurements preceding the Nth position in at least one of the sorted measurements is less than or equal to the third threshold.

[0449] In one possible implementation, the second transceiver unit 1502 is further configured to:

[0450] A third message sent to the terminal device, the third message being used to indicate the at least one first configuration.

[0451] In one possible implementation, the third information is a system message, and the second transceiver unit 1502 is used for:

[0452] The system message is broadcast to the terminal device.

[0453] In one possible implementation, the SDT is based on the random access procedure, and the third information is at least one of the following:

[0454] Msg2 during the random access process;

[0455] Msg4 during the random access process;

[0456] Messages used to send downlink data.

[0457] In one possible implementation, the second transceiver unit 1502 is further configured to:

[0458] Send a fourth message to the terminal device, the fourth message indicating at least one second configuration for wireless link monitoring.

[0459] In one possible implementation, the third information includes an activation indication for indicating the activation of at least some or all of the at least one second configuration, wherein the at least one first configuration is the part or all of the second configuration activated by the activation indication.

[0460] In one possible implementation, the third information further includes activation conditions for activating part or all of the second configuration, the activation conditions including time information and / or a data volume threshold, the data volume threshold being used to indicate that the partial or all of the second configuration is activated when the total amount of small data to be transmitted by the terminal device is greater than or equal to the data volume threshold.

[0461] In one possible implementation, the SDT is an SDT based on uplink unlicensed CG resources, and the third information is at least one of the following:

[0462] The first message sent by the network device to the terminal device;

[0463] The network device sends a message containing downlink data to the terminal device.

[0464] In one possible implementation, the third information further includes parameters corresponding to the conditions, including duration and / or threshold.

[0465] In one possible implementation,

[0466] The parameter includes the first threshold if the condition includes a measurement result on each of all beams being less than or equal to a first threshold.

[0467] The parameter includes the first threshold and the first duration, provided that the measurement result on each of the all beams is less than or equal to a first threshold within a first duration.

[0468] The first parameter includes the second threshold when the condition includes the fact that the average value of the measurement results on all beams is less than or equal to the second threshold.

[0469] The parameters include the second threshold and the second duration, provided that the average value of the measurements on all beams is less than or equal to the second threshold within the second duration.

[0470] The parameter includes the third threshold if the average of the measurements preceding the Nth position in at least one sorted measurement result is less than or equal to the third threshold.

[0471] The parameter includes the third threshold and the third duration, provided that, within the third duration, the average value of the measurements preceding the Nth position in the sorted at least one measurement is less than or equal to the third threshold.

[0472] In one possible implementation, the second transceiver unit 1502 is further configured to:

[0473] Send fifth information to the terminal device, the fifth information including parameters corresponding to the condition, the parameters including duration and / or threshold;

[0474] Wherein, the parameter includes the first threshold, provided that the condition includes a measurement result on each of the all beams being less than or equal to a first threshold.

[0475] The parameter includes the first threshold and the first duration, provided that the measurement result on each of the all beams is less than or equal to a first threshold within a first duration.

[0476] The first parameter includes the second threshold when the condition includes the fact that the average value of the measurement results on all beams is less than or equal to the second threshold.

[0477] The parameters include the second threshold and the second duration, provided that the average value of the measurements on all beams is less than or equal to the second threshold within the second duration.

[0478] The parameter includes the third threshold if the average of the measurements preceding the Nth position in at least one sorted measurement result is less than or equal to the third threshold.

[0479] The parameter includes the third threshold and the third duration, provided that, within the third duration, the average value of the measurements preceding the Nth position in the sorted at least one measurement is less than or equal to the third threshold.

[0480] It should be noted that the division of units (modules) in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. The functional modules in the embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules can be implemented in hardware or as software functional modules.

[0481] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of this application, in essence, or the parts that contribute to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium can be a memory or other media capable of storing program code.

[0482] Figure 16 shows a network device 1600 provided in an embodiment of this application. The network device 1600 can be a network device capable of implementing the functions of the network device in the method provided in this application embodiment; the network device 1600 can also be a device that supports the network device in implementing the functions of the network device in the method provided in this application embodiment. The network device 1600 can be a chip system. In this embodiment, the chip system can be composed of chips or may include chips and other discrete components.

[0483] In terms of hardware implementation, the transceiver is integrated into the network device 1600 to form the communication interface 1610.

[0484] Network device 1600 includes at least one processor 1620 for implementing or supporting network device 1600 in implementing the functions of the network device in the methods provided in the embodiments of this application. For example, processor 1620 can control communication interface 1610 to perform Small Data Transmission (SDT) with terminal device; see the detailed description in the method examples for more details, which will not be repeated here.

[0485] Network device 1600 may further include at least one memory 1630 for storing program instructions and / or data. Memory 1630 is coupled to processor 1620. The coupling in this embodiment is an indirect coupling or communication connection between devices, units, or modules, and may be electrical, mechanical, or other forms, for information exchange between devices, units, or modules. Processor 1620 may operate in conjunction with memory 1630. Processor 1620 may execute program instructions stored in memory 1630. At least one of the at least one memory may be included in the processor.

[0486] Network device 1600 may further include a communication interface 1610 for communicating with other devices via a transmission medium, thereby enabling devices in network device 1600 to communicate with other devices. Exemplarily, this other device may be a network-side device. Processor 1620 may use communication interface 1610 to send and receive data. Specifically, communication interface 1610 may be a transceiver.

[0487] This embodiment does not limit the specific connection medium between the communication interface 1610, processor 1620, and memory 1630. In Figure 16, the memory 1630, processor 1620, and communication interface 1610 are connected via a bus 1640, indicated by a thick line. The connection methods between other components are merely illustrative and not intended to be limiting. The bus can be categorized as an address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 16, but this does not imply that there is only one bus or one type of bus.

[0488] In the embodiments of this application, the processor 1620 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or being executed by a combination of hardware and software modules in the processor.

[0489] In this embodiment, the memory 1630 can be non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or it can be volatile memory, such as random-access memory (RAM). Memory is any other medium capable of carrying or storing desired program code in the form of instructions or data structures, and accessible by a computer, but is not limited thereto. The memory in this embodiment can also be a circuit or any other device capable of implementing storage functions, used to store program instructions and / or data.

[0490] Figure 17 shows a terminal device 1700 provided in an embodiment of this application. The terminal device 1700 can be a terminal device capable of implementing the functions of the terminal device in the method provided in this application embodiment; the terminal device 1700 can also be a device capable of supporting the terminal device in implementing the functions of the terminal device in the method provided in this application embodiment. The terminal device 1700 can be a chip system. In this embodiment, the chip system can be composed of chips or may include chips and other discrete devices.

[0491] In terms of hardware implementation, the transceiver is integrated into the terminal device 1700 to form the communication interface 1710.

[0492] Terminal device 1700 includes at least one processor 1720, used to implement or support terminal device 1700 in implementing the functions of the terminal device in the methods provided in the embodiments of this application. For example, processor 1720 can perform radio link monitoring of a first cell based on at least one first configuration when controlling communication interface 1710 to perform Small Data Transmission (SDT) with network devices, as detailed in the method examples, which will not be repeated here.

[0493] Terminal device 1700 may further include at least one memory 1730 for storing program instructions and / or data. Memory 1730 is coupled to processor 1720. The coupling in this embodiment is an indirect coupling or communication connection between devices, units, or modules, and may be electrical, mechanical, or other forms, used for information exchange between devices, units, or modules. Processor 1720 may operate in conjunction with memory 1730. Processor 1720 may execute program instructions stored in memory 1730. At least one of the at least one memory may be included in the processor.

[0494] Terminal device 1700 may further include a communication interface 1710 for communicating with other devices via a transmission medium, thereby enabling devices in terminal device 1700 to communicate with other devices. For example, the other device may be a network-side device. Processor 1720 may use communication interface 1710 to send and receive data. Specifically, communication interface 1710 may be a transceiver.

[0495] This embodiment does not limit the specific connection medium between the communication interface 1710, processor 1720, and memory 1730. In Figure 17, the memory 1730, processor 1720, and communication interface 1710 are connected via a bus 1740, which is represented by a thick line. The connection methods between other components are for illustrative purposes only and are not intended to be limiting. The bus can be classified as an address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 17, but this does not indicate that there is only one bus or one type of bus.

[0496] In the embodiments of this application, the processor 1720 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or being executed by a combination of hardware and software modules in the processor.

[0497] In this embodiment, the memory 1730 can be non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or it can be volatile memory, such as random-access memory (RAM). Memory is any other medium capable of carrying or storing desired program code in the form of instructions or data structures, and accessible by a computer, but is not limited thereto. The memory in this embodiment can also be a circuit or any other device capable of implementing storage functions for storing program instructions and / or data.

[0498] This application embodiment further provides a computer-readable storage medium storing computer instructions that, when executed on an electronic device, cause the electronic device to perform the functions of the terminal device or network device in the aforementioned resource indication method.

[0499] The aforementioned computer-readable storage medium may take the form of any combination of one or more computer-readable media. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in connection with an instruction execution system, apparatus, or device.

[0500] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0501] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, radio frequency (RF), etc., or any suitable combination thereof.

[0502] Computer program code for performing the operations described herein can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as "C" or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0503] This application also provides a computer program product that, when run on a computer, causes the computer to perform some or all of the steps described in the method embodiments above.

[0504] This application provides a chip system including a processor and potentially a memory, for implementing the functions of the terminal device or network device described in the aforementioned methods. The chip system can be composed of chips or may include chips and other discrete components.

[0505] This application provides a communication system, which includes the aforementioned terminal device and network device.

[0506] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0507] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another apparatus, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of apparatus or units may be electrical, mechanical, or other forms.

[0508] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0509] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0510] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of wireless communication, comprising: The method is applied to a terminal device, and the method comprises: In a case of performing small data transmission (SDT) with a network device, performing radio link monitoring on a first cell based on at least one first configuration, the at least one first configuration comprising a reference signal used for performing radio link monitoring, and the first cell comprising a serving cell of the terminal device.

2. The method of claim 1, wherein, The method further comprises: In a case where a measurement result of performing radio link monitoring on the first cell based on the at least one first configuration satisfies a condition, performing a first operation, the first operation comprising at least one of the following operations: stopping or suspending the SDT transmission; switching to an idle state in a case where the terminal device is in an inactive state; cell reselection; selecting a camping cell; sending first information to the network device, the first information being used for indicating that the RLF of the first cell occurs; sending second information to the network device, the second information comprising the measurement result.

3. The method of claim 2, wherein, The measurement result comprises information used for indicating a channel quality of a radio link, and the condition comprises a condition associated with the channel quality.

4. The method according to any one of claims 1 to 3, characterized in that, The reference signal comprises a reference signal corresponding to each beam, each beam being one of all beams included in the first cell, and the measurement result is obtained by measuring the reference signal corresponding to each beam.

5. The method according to any one of claims 2-4, characterized in that, The condition comprises at least one of the following conditions: the measurement result on each beam of the all beams is less than or equal to a first threshold value; in a first time length, the measurement result on each beam of the all beams is less than or equal to the first threshold value; an average value of the measurement result on the all beams is less than or equal to a second threshold value; in a second time length, the average value of the measurement result on the all beams is less than or equal to the second threshold value; an average value of measurement results located before an Nth position in at least one measurement result after sorting is less than or equal to a third threshold value, N being a positive integer, and the at least one measurement result being measurement results corresponding to the all beams; in a third time length, the average value of the measurement results located before the Nth position in the at least one measurement result after sorting is less than or equal to the third threshold value.

6. The method of claim 1, wherein, In a case where the measurement result of performing radio link monitoring on the first cell based on the at least one first configuration does not satisfy the condition, a time length during which the terminal device performs the SDT with the network device is greater than or equal to a time length threshold value, and / or a data amount during which the terminal device performs the SDT with the network device is greater than or equal to the data amount threshold value.

7. The method according to any one of claims 1 to 6, characterized in that, The method further comprises: receiving third information sent by the network device, the third information being used for indicating the at least one first configuration.

8. The method of claim 7, wherein, The third information is a system message, and the receiving of the third information sent by the network device comprises: receiving a system message broadcast by the network device.

9. The method of claim 7, wherein, The SDT is a SDT based on a random access procedure, and the third information is at least one of the following information: a Msg2 in the random access procedure; a Msg4 in the random access procedure; a message used for sending downlink data in the random access procedure.

10. The method of claim 9, wherein, The method further comprises: receiving fourth information sent by the network device, the fourth information being used for indicating at least one second configuration, the at least one second configuration being used for wireless link monitoring.

11. The method of claim 10, wherein, The third information comprises an activation indication, the activation indication being used for indicating activation of at least part or all of the at least one second configuration, the at least one first configuration being the part or all of the second configuration activated by the activation indication.

12. The method of claim 11, wherein, The third information further comprises an activation condition for activating the part or all of the second configuration, the activation condition comprising time information and / or a data amount threshold, the data amount threshold being used for indicating that the part or all of the second configuration is activated in a case where a data amount sum of small data to be transmitted by the terminal device is greater than or equal to the data amount threshold.

13. The method of claim 7, wherein, The SDT is an SDT based on resources of uplink grant-free CG, and the third information is at least one of the following information: a first message sent by the network device to the terminal device; a message in which the network device sends downlink data to the terminal device.

14. The method according to any one of claims 7-13, characterized in that, The third information further comprises a parameter corresponding to the condition, the parameter comprising a time length and / or a threshold.

15. The method of claim 14, wherein, in a case where the condition comprises that measurement results on each of the all beams are less than or equal to a first threshold, the parameter comprises the first threshold; in a case where the condition comprises that measurement results on each of the all beams are less than or equal to a first threshold within a first time length, the parameter comprises the first threshold and the first time length; in a case where the condition comprises that an average value of measurement results on the all beams is less than or equal to a second threshold, the parameter comprises the second threshold; in a case where the condition comprises that an average value of measurement results on the all beams within a second time length is less than or equal to a second threshold, the parameter comprises the second threshold and the second time length; in a case where the condition comprises that an average value of measurement results located before Nth in an ordered at least one measurement result is less than or equal to a third threshold, the parameter comprises the third threshold; in a case where the condition comprises that an average value of measurement results located before Nth of an ordered at least one measurement result within a third time length is less than or equal to a third threshold, the parameter comprises the third threshold and the third time length.

16. The method of any one of claims 2-13, wherein, The method further comprises: receiving fifth information sent by the network device, the fifth information comprising a parameter corresponding to the condition, the parameter comprising a time length and / or a threshold; wherein, in a case where the condition comprises that measurement results on each of the all beams are less than or are equal to a first threshold, the parameter comprises the first threshold; in a case where the condition comprising that measurement results on each of the all beams are less than or equal to a first threshold within the first time length, the parameter comprises the first threshold and the first time length; in a case that the condition comprises that an average value of measurement results on the all beams is less than or equal than a second threshold, the parameter comprises the second threshold; in a case that the condition comprises that an average value of measurement results on the all beams within a second time length less than or equal to a second threshold, the parameter comprises the second threshold and the second time. In a case where the condition comprises that, within a second time length, an average of the measurement results on all the beams is less than or equal to a second threshold value, the parameter comprises the second threshold value and the second time length; In a case where the condition comprises that, in the sorted at least one measurement result, an average of the measurement results before Nth is less than or equal to a third threshold value, the parameter comprises the third threshold value; In a case where the condition comprises that, within a third time length, an average of the measurement results before Nth in the sorted at least one measurement result is less than or equal to a third threshold value, the parameter comprises the third threshold value and the third time length.

17. A method of wireless communication, the method comprising: The method is applied to a network device, and the method comprises: performing small data transmission (SDT) with a terminal device; In a case where the terminal device performs the SDT, the terminal device performs radio link monitoring on a first cell based on at least one first configuration, the at least one first configuration comprises a reference signal used for performing the radio link monitoring, and the first cell comprises a serving cell of the terminal device.

18. The method of claim 17, wherein, The measurement result comprises information used for indicating a channel quality of a radio link.

19. The method of claim 17 or 18, wherein, The reference signal comprises a reference signal corresponding to each beam, and each beam is one of all beams included in the first cell; In a case where the measurement result, which is obtained by the terminal device by measuring the reference signal corresponding to each beam on each beam, satisfies a condition, the terminal device performs a first operation based on the at least one first configuration; The first operation comprises at least one of the following operations: The terminal device stops or suspends the SDT transmission; In a case where the terminal device is in an inactive state, the terminal device switches to an idle state; The terminal device performs cell reselection; The terminal device selects a camping cell; Receiving first information sent by the terminal device, the first information being used for indicating that the RLF occurs in the first cell; Receiving second information sent by the terminal device, the second information comprising the measurement result.

20. The method of claim 19, wherein, The condition comprises a condition associated with a channel quality, and the condition comprises at least one of the following conditions: The measurement result on each beam of all the beams is less than or equal to a first threshold value; Within a first time length, the measurement result on each beam of all the beams is less than or equal to a first threshold value; An average of the measurement results on all the beams is less than or equal to a second threshold value; Within a second time length, an average of the measurement results on all the beams is less than or is equal to a second threshold value; In the sorted at least one measurement result, an average of the measurement results before Nth is less that or equal to a third threshold value, N being a positive integer, and the at least one measurement result is a measurement result corresponding to all the beams; Within a third time length, an average of the measurement results before Nth in the sorted at least measurement result is less than or equal to a third threshold value.

21. The method of claim 17 or 18, wherein, In a case where a measurement result of the terminal device performing radio link monitoring on the first cell based on the at least one first configuration does not satisfy a condition, the terminal device performs the SDT with the network device for a time duration greater than or equal to a time duration threshold, and / or the terminal device performs the SDT with the network device for a data volume greater than or equal to a data volume threshold.

22. The method of any one of claims 17-21, wherein, The method further includes: sending, to the terminal device, third information, the third information being used to indicate the at least one first configuration.

23. The method of claim 22, wherein, The third information is a system message, and the third information sent to the terminal device includes: broadcasting, to the terminal device, the system message.

24. The method of claim 22, wherein, The SDT is an SDT based on a random access procedure, and the third information is at least one of the following: Msg2 in the random access procedure; Msg4 in the random access procedure; a message used to send downlink data.

25. The method of claim 24, wherein, The method further includes: sending, to the terminal device, fourth information, the fourth information being used to indicate at least one second configuration, the at least one second configuration being used for radio link monitoring.

26. The method of claim 25, wherein, The third information includes an activation indication, the activation indication being used to indicate activation of at least part or all of the at least one second configuration, and the at least one first configuration is the part or all of the at least one second configuration activated by the activation indication.

27. The method of claim 26, wherein, The third information further includes an activation condition for activating the part or all of the at least one second configuration, the activation condition including time information and / or a data volume threshold, the data volume threshold being used to indicate that the part or all of the at least one second configuration is activated in a case where a data volume sum of small data to be transmitted by the terminal device is greater than or equal to the data volume threshold 28. The method of claim 22, wherein, The SDT is an SDT based on resources of uplink grant-free CG, and the third information is at least one of the following: a first message sent by the network device to the terminal device; a message used by the network device to send downlink data to the terminal device.

29. The method of any one of claims 22-28, wherein, The third information further includes a parameter corresponding to a condition, the parameter including a time duration and / or a threshold.

30. The method of claim 29, wherein, in a case where the condition includes a measurement result on each of the all beams being less than or equal to a first threshold, the parameter includes the first threshold; in a case where the condition includes a measurement result on each of the all beams being less than or equal to a first time duration, the parameter includes the first threshold and the first time duration; in a case where the condition includes an average value of measurement results on the all beams being less than or equal to a second threshold, the parameter includes the second threshold; in a case where the condition includes an average value of measurement results on the all beams being greater than or equal to a second time duration, the parameter includes the second threshold and the second time duration; in a case where the condition includes an average value of measurement results located before an Nth position in an ordered at least one measurement result being less than or equal to a third threshold, the parameter includes the third threshold. In a case where the condition comprises that, within a third time length, an average of measurement results located before N positions in the sorted at least one measurement result is less than or equal to a third threshold value, the parameter comprises the third threshold value and the third time length.

31. The method of claims 19-28, wherein, The method further comprises: sending fifth information to the terminal device, the fifth information comprising a parameter corresponding to the condition, the parameter comprising a time length and / or a threshold value; wherein, in a case where the condition comprises that the measurement result on each of the all beams is less than or equal to a first threshold value, the parameter comprises the first threshold value; In a case where the condition comprises that, within a first time length, the measurement result on each of the all beams is less than or equal to a first threshold value, the parameter comprises the first threshold value and the first time length. In a case where the condition comprises that an average of the measurement results on the all beams is less than or equal to a second threshold value, the parameter comprises the second threshold value. In a case where the condition comprises that, within a second time length, the average of the measurement results on the all beams is less than or equal to a second threshold value, the parameter comprises the second threshold value and the second time length. In a case where the condition comprises that, within a third time length, an average of measurement results located before N positions in the sorted at least one measurement result is less than or equal to a third threshold value, the parameter comprising the third threshold value and the third time length. comprise a first processing unit and a first transceiving unit, wherein:

32. A terminal device, comprising: The first processing unit is configured to, in a case where the first transceiving unit is controlled to perform small data transmission (SDT) with a network device, perform radio link monitoring on a first cell based on at least one first configuration, the at least one first configuration comprising a reference signal used for radio link monitoring, and the first cell comprising a serving cell of the terminal device. The first processing unit is further configured to:

33. The terminal device of claim 32, wherein, In a case where a measurement result of the radio link monitoring on the first cell based on the at least one first configuration satisfies a condition, perform a first operation, the first operation comprising at least one of the following operations: stop or suspend the SDT transmission; switch to an idle state in a case where the terminal device is in an inactive state; cell reselection; select a camping cell; control the first transceiving unit to send first information to the network device, the first information being used to indicate that the RLF occurs in the first cell; control the first transceiving unit to send second information to the network device, the second information comprising the measurement result. The measurement result comprises information used to indicate a channel quality of a radio link, and the condition comprises a condition associated with the channel quality.

34. The terminal device of claim 33, wherein, The reference signal comprises a reference signal corresponding to each beam, the each beam being one of all beams included in the first cell, and the measurement result is obtained by measuring the reference signal corresponding to the beam on the each beam.

35. The terminal device of any one of claims 32-34, wherein, The measurement result comprises information used to indicate a channel quality of a radio link, and the first condition comprises a condition associated with the channel quality.

36. The terminal device of any one of claims 33-35, wherein, The conditions include at least one of the following conditions: a measurement result on each of the all beams is less than or equal to a first threshold value; a measurement result on each of the all beams is less than or equal to a first threshold value within a first time length; an average value of measurement results on the all beams is less than or equal to a second threshold value; an average value of measurement results on the all beams is less than or equal to a second threshold value within a second time length; an average value of measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value, N being a positive integer; the at least one measurement result is a measurement result corresponding to the all beams; an average value of measurement results located before Nth in the sorted at least one measurement result within a third time length is less than or equal to a third threshold value.

37. The terminal device of claim 32, wherein, In a case where the measurement result of the first cell based on the at least one first configuration by the first processing unit does not satisfy the condition, the first transceiver is controlled to perform the SDT with the network device for a time length greater than or equal to a time length threshold value, and / or, a data amount of the SDT with the network device by the first transceiver is controlled to be greater than or equal to a data amount threshold value.

38. The terminal device of any one of claims 32-37, wherein, The first transceiver is further configured to: receive third information sent by the network device, the third information being used to indicate the at least one first configuration.

39. The terminal device of claim 38, wherein, The third information is a system message, and the first transceiver is configured to: receive the system message broadcast by the network device.

40. The terminal device of claim 38, wherein, The SDT is a SDT based on a random access procedure, and the third information is at least one of the following information: Msg2 in the random access procedure; Msg4 in the random access procedure; a message used to send downlink data in the random access procedure.

41. The terminal device of claim 40, wherein, The first transceiver is further configured to: receive fourth information sent by the network device, the fourth information being used to indicate at least one second configuration, the at least one second configuration being used for radio link monitoring.

42. The terminal device of claim 41, wherein, The third information includes an activation indication, the activation indication being used to indicate to activate at least part or all of the at least one second configuration, and the at least one first configuration is the part or all of the second configuration activated by the activation indication.

43. The terminal device of claim 42, wherein, The third information further includes an activation condition of the part or all of the second configuration, the activation condition including time information and / or a data amount threshold value, and the data amount threshold value being used to indicate that the part or all of the second configuration is activated in a case where a data amount sum of small data to be transmitted by the terminal device is greater than or equal to the data amount threshold value.

44. The method of claim 38, wherein, The SDT is a SDT based on a resource of uplink grant-free CG, and the third information is at least one of the following information: a first message sent by the network device to the terminal device; a message used by the network device to send downlink data to the terminal device.

45. The method of any one of claims 38-44, wherein, The third information further includes a parameter corresponding to a condition, the parameter including a time length and / or a threshold value.

46. The method of claim 45, wherein, in a case where the condition comprises that the measurement result on each of the all beams is less than or equal to a first threshold value, the parameter comprises the first threshold value; in a case where the condition comprises that the measurement result on each of the all beams is less than or equal to a first threshold value within a first time length, the parameter comprises the first threshold value and the first time length; in a case where the condition comprises that an average value of the measurement results on the all beams is less than or equal to a second threshold value, the parameter comprises the second threshold value; in a case where the condition comprises that the average value of the measurement results on the all beams is less than or equal to a second threshold value within a second time length, the parameter comprises the second threshold value and the second time length; in a case where the condition comprises that an average value of the measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value, the parameter comprises the third threshold value; in a case where the condition comprises that the average value of the measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value within a third time length, the parameter comprises the third threshold value and the third time length.

47. The terminal device of any one of claims 33-44, wherein, The first transceiver unit is further configured to: receive fifth information sent by the network device, the fifth information comprising a parameter corresponding to the condition, the parameter comprising a time length and / or a threshold value; in a case where the condition comprises that the measurement result on each of the all beams is less than or equal to a first threshold value, the parameter comprises the first threshold value; in a case where the condition comprises that the measurement result on each of the all beams is less than or equal to a first threshold value within a first time length, the parameter comprises the first threshold value and the first time length; in a case where the condition comprises that an average value of the measurement results on the all beams is less than or equal to a second threshold value, the parameter comprises the second threshold value; in a case where the condition comprises that the average value of the measurement results on the all beams is less than or equal to a second threshold value within a second time length, the parameter comprises the second threshold value and the second time length; in a case where the condition comprises that an average value of the measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value, the parameter comprises the third threshold value; in a case where the condition comprises that the average value of the measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value within a third time length, the parameter comprises the third threshold value and the third time length.

48. A network device, comprising: The second processing unit and the second transceiver unit are included, wherein: the second transceiver unit is configured to perform, under control of the second processing unit, small data transmission (SDT) with a terminal device; in a case where the terminal device performs SDT, the terminal device performs wireless link monitoring on a first cell based on at least one first configuration, the at least one first configuration comprising a reference signal used for performing wireless link monitoring, and the first cell comprising a serving cell of the terminal device.

49. The network device of claim 48, wherein, The measurement result comprises information used for indicating channel quality of a wireless link.

50. The network device of claim 48 or 49, wherein, The reference signal comprises a reference signal corresponding to each beam, and each beam is one of all beams included by the first cell; The terminal device performs a first operation in a case where a measurement result of the terminal device performing radio link monitoring on the first cell based on at least one first configuration meets a condition, the measurement result being obtained by the terminal device measuring a reference signal corresponding to a beam on each beam; The first operation comprises at least one of the following operations: The terminal device stops or suspends the SDT transmission; In a case where the terminal device is in an inactive state, the terminal device switches to an idle state; The terminal device performs cell reselection; The terminal device selects a camping cell; The second transceiver is further configured to perform at least one of the following operations: Receive first information sent by the terminal device, the first information being used to indicate that the RLF occurs in the first cell; Receive second information sent by the terminal device, the second information comprising the measurement result.

51. The network device of claim 49 or 50, wherein, The condition comprises a condition associated with channel quality, and the condition comprises at least one of the following conditions: The measurement result on each beam of the all beams is less than or equal to a first threshold value; In a first time length, the measurement result on each beam of the all beams is less than or equal to the first threshold value; An average value of the measurement result on the all beams is less than or equal to a second threshold value; In a second time length, the average value of the measurement result on the all beams is less than or equal to the second threshold value; An average value of measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value, N being a positive integer, and the at least one measurement result being measurement results corresponding to the all beams; In a third time length, the average value of the measurement results located before Nth in the sorted at least one measurement result is less than or equal to the third threshold value.

52. The network device of claim 48 or 49, wherein, In a case where the measurement result of the terminal device performing radio link monitoring on the first cell based on at least one first configuration does not meet the condition, control the second transceiver to perform the SDT with the terminal device for a time length greater than or equal to a time length threshold value, and / or control the second transceiver to perform the SDT with the terminal device for a data amount greater than or equal to a data amount threshold value.

53. The network device of any of claims 48-52, wherein, The second transceiver is further configured to: Send third information to the terminal device, the third information being used to indicate the at least one first configuration.

54. The network device of claim 53, wherein, The third information is a system message, and the second transceiver is configured to: Broadcast the system message to the terminal device.

55. The network device of claim 53, wherein, The SDT is an SDT based on a random access procedure, and the third information is at least one of the following information: Msg2 in the random access procedure; Msg4 in the random access procedure; A message used to send downlink data.

56. The network device of claim 55, wherein, The second transceiver is further configured to: Send fourth information to the terminal device, the fourth information being used to indicate at least one second configuration, the at least one second configuration being used for radio link monitoring.

57. The network device of claim 56, wherein, The third information includes an activation indication, and the activation indication is used to indicate activation of at least part or all of the at least one second configuration, and the at least one first configuration is the part or all of the second configuration activated by the activation indication.

58. The network device of claim 57, wherein, The third information further includes an activation condition of the activation of the part or all of the second configuration, and the activation condition includes time information and / or a data amount threshold, and the data amount threshold is used to indicate that the part or all of the second configuration is activated in a case where a data amount sum of small data to be transmitted by the terminal device is greater than or equal to the data amount threshold.

59. The network device of claim 53, wherein, The SDT is an SDT based on uplink grant-free CG resources, and the third information is at least one of the following information: The first message sent by the network device to the terminal device; The message in which the network device sends downlink data to the terminal device.

60. The network device of any of claims 53-59, wherein, The third information further includes a parameter corresponding to the condition, and the parameter includes a time length and / or a threshold.

61. The network device of claim 60, wherein, in a case where the condition includes that measurement results on each of the all beams are less than or equal to a first threshold, the parameter includes the first threshold; in a case where the condition includes that measurement results on each of the all beams are less than or equal to a first threshold within a first time length, the parameter includes the first threshold and the first time length; in a case where the condition includes that an average value of the measurement results on the all beams is less than or equal to a second threshold, the first parameter includes the second threshold; in a case where the condition includes that an average value of the measurement results on the all beam is less than or equal to a second threshold within a second time length, the parameter includes the second threshold and the second time length; in a case where the condition includes that an average value of measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold, the parameter includes the third threshold; in a case where the condition includes that an average value of measurement results located before Nth of the sorted at least one measurement result is less than or equal to a third threshold within a third time length, the parameter includes the third threshold and the third time length.

62. The method of any one of claims 50-59, wherein, The second transceiver is further configured to: send, to the terminal device, fifth information including a parameter corresponding to the condition, and the parameter includes a time length and / or a threshold; in a case where the condition includes that measurement results on each of the all beams are greater than or equal to a first threshold, the parameter includes the first threshold; in a case where a condition includes that measurement results on each of the all beams are less than or equal to a first time length within a first threshold, the parameter includes the first threshold and the first time length; in a case where the condition comprises that an average value of the measurement results on the all beams is less than or equal to a first threshold, the first parameter includes the first threshold; in a case where the condition includes that an average value of measurement results located before N in the sorted at least one measurement result is less than or equal to a third threshold, the first parameter includes the third threshold. in a case where the condition comprises that an average of the measurement results on all beams is less than or equal to a second threshold value within a second time length, the parameter comprises the second threshold value and the second time length; in a case where the condition comprises that an average of the measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value, the parameter comprises the third threshold value; in a case where the condition comprises that an average of the measurement results located before Nth in the sorted at least one measurement result is less than or equal to a third threshold value within a third time length, the parameter comprises the third threshold value and the third time length. 63.A terminal device, comprising a memory and a processor, the memory storing a computer program capable of running on the processor, characterized in that, The processor, when executing the program, implements the steps of the method of any one of claims 1-16. 64.A network device comprising a memory and a processor, the memory storing a computer program capable of running on the processor, characterized in that, The processor, when executing the program, implements the steps of the method of any one of claims 17-31.

65. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, implements the method of any one of claims 1-16 or 17-31.

66. A computer program product, comprising computer program code embodied therein, characterized in that, The computer program code, when running on a computer, causes the computer to implement the method of any one of claims 1-16 or 17-31.

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