Data transmission methods, apparatus, storage media, communication devices, and communication systems

Abstract

This disclosure relates to a data transmission method, apparatus, storage medium, communication device, and communication system. The method includes the steps of receiving first information transmitted by an access network device, or transmitting second information to the access network device, wherein the first information relates to the small data transmission settings of a terminal device, and the second information relates to incoming communications of a core network-based mobile station. This disclosure enables a core network device to take into account the small data transmission settings of a terminal device when processing downlink information of the terminal device, and enables an access network device to obtain information regarding incoming communications of a core network-based mobile station.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technologies, and more specifically, to a data transmission method, apparatus, storage medium, communication device, and communication system.

Background Art

[0002] In current wireless communication systems, various standards and protocols are used to transmit data between a base station and a wireless mobile device based on wireless mobile communication technology. When a wireless mobile device transmits data to a network, it may be necessary to establish a connection with the network regardless of the amount of data to be transmitted.

Summary of the Invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a data transmission method, apparatus, storage medium, communication device, and communication system.

[0004] In a first aspect, embodiments of the present disclosure provide a data transmission method executed by a core network device. The method includes receiving first information sent by an access network device, or sending second information to the access network device, where the first information is related to the setting of small data transmission of a terminal device, and the second information is related to the incoming communication of a core network-based mobile station.

[0005] In relation to some embodiments of the first aspect, in some embodiments, the method further includes determining whether to transmit buffered downlink information based on the first information, where the downlink information includes signaling and / or data buffered for performing the incoming communication of the core network-based mobile station.

[0006] In relation to some embodiments of the first embodiment, in some embodiments, The first piece of information mentioned above is, First instruction information indicating whether or not the small data transmission is configured on the terminal device, A first information type corresponding to small data transmission set on the terminal device, The extended intermittent reception period parameter set in the terminal device, Threshold information corresponding to small data transmission set on the aforementioned terminal device, A first protocol data unit session identifier corresponding to small data transmission set on the terminal device, and A first quality of service flow identifier corresponding to small data transmission set on the terminal device, It includes at least one of the following.

[0007] In relation to some embodiments of the first aspect, in some embodiments, the step of determining whether or not to transmit buffered downlink information based on the first information is: If it is determined that the terminal device is configured for small data transmission based on the first instruction information, the process includes transmitting the downlink information corresponding to the small data transmission.

[0008] In relation to some embodiments of the first aspect, in some embodiments, the step of determining whether or not to transmit buffered downlink information based on the first information is: If the information in the downlink information belongs to the first information type, the method includes the step of transmitting the downlink information corresponding to the small data transmission.

[0009] In relation to some embodiments of the first aspect, in some embodiments, the step of determining whether or not to transmit buffered downlink information based on the first information is: If the extended intermittent reception period, represented by the extended intermittent reception period parameter, is greater than or equal to a preset period, the method includes transmitting the downlink information corresponding to the small data transmission.

[0010] In relation to some embodiments of the first aspect, in some embodiments, the step of determining whether or not to transmit buffered downlink information based on the first information is: The method includes transmitting the downlink information corresponding to the small data transmission if the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information.

[0011] In relation to some embodiments of the first aspect, in some embodiments, the step of determining whether or not to transmit buffered downlink information based on the first information is: The step of transmitting the downlink information corresponding to the small data transmission is included if a second protocol data unit session identifier corresponding to information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and / or a second quality of service flow identifier corresponding to information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0012] In relation to some embodiments of the first aspect, in some embodiments, the step of receiving first information transmitted by the access network device is: The step includes receiving a first message transmitted by the access network device, The first message carries the first information.

[0013] In relation to some embodiments of the first aspect, in some embodiments, the step of receiving a first message transmitted by the access network device is: The step includes receiving a control plane message transmitted by the access network device.

[0014] In relation to some embodiments of the first aspect, in some embodiments, the step of receiving a first message transmitted by the access network device is: The step includes receiving user plane messages transmitted by the access network device.

[0015] In relation to some embodiments of the first aspect, in some embodiments, the step of receiving a first message transmitted by the access network device is: The step includes receiving an inactive state transition report message from the access network device to the terminal device.

[0016] In relation to some embodiments of the first aspect, in some embodiments, the inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0017] In relation to some embodiments of the first embodiment, in some embodiments, the method further, The process includes deciding to transmit the buffered downlink information and, based on the first information, transmitting the downlink information corresponding to the small data transmission to the access network device.

[0018] In relation to some embodiments of the first embodiment, in some embodiments, the second information is Second instruction information that signals the start of buffering, A second type of information corresponding to the buffered downlink information, Time information corresponding to the buffered downlink information, The data size corresponding to the buffered downlink information, A third protocol data unit session identifier corresponding to the buffered downlink information, and a third service quality flow identifier corresponding to the buffered downlink information, including at least one of them.

[0019] In connection with some embodiments of the first aspect, in some embodiments, the step of transmitting the second information to the access network device comprises the step of transmitting a second message to the access network device, wherein the second message carries the second information.

[0020] In connection with some embodiments of the first aspect, in some embodiments, the step of transmitting a second message to the access network device comprises the step of transmitting a control plane message to the access network device.

[0021] In connection with some embodiments of the first aspect, in some embodiments, the step of transmitting a second message to the access network device comprises the step of transmitting a user plane message to the access network device.

[0022] In connection with some embodiments of the first aspect, in some embodiments, the method further comprises receiving third information transmitted by the access network device, and determining whether to transmit the downlink information corresponding to the small data transmission based on the third information.

[0023] In connection with some embodiments of the first aspect, in some embodiments, the third information is third indication information for notifying the core network device that the terminal device can receive the downlink information, A third type of information corresponding to the downlink information that the terminal device can receive, A fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive, and A fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive, It includes at least one of the following.

[0024] In relation to some embodiments of the first embodiment, in some embodiments, the method further, The process includes deciding to transmit the downlink information corresponding to the small data transmission, and transmitting the downlink information corresponding to the small data transmission to the access network device based on the third information.

[0025] In a second embodiment, an embodiment of the present disclosure provides a data transmission method performed by an access network device. The method is: The process includes the steps of transmitting first information to a core network device, or receiving second information transmitted by the core network device, The first piece of information mentioned above relates to the settings for small data transmission of the terminal device, The second piece of information mentioned above relates to incoming communications of core network-based mobile stations.

[0026] In relation to some embodiments of the second embodiment, in some embodiments, the information described in the first embodiment is First instruction information indicating whether or not the small data transmission is configured on the terminal device, A first information type corresponding to small data transmission set on the terminal device, The extended intermittent reception period parameter set in the terminal device, Threshold information corresponding to small data transmission set on the aforementioned terminal device, A first protocol data unit session identifier corresponding to small data transmission set on the terminal device, and A first quality of service flow identifier corresponding to small data transmission set on the terminal device, It includes at least one of the following.

[0027] In relation to some embodiments of the second aspect, in some embodiments, the step of transmitting the first information to the core network device is: The steps include sending a first message to the core network device, The first message carries the first information.

[0028] In relation to some embodiments of the second aspect, in some embodiments, the step of sending a first message to the core network device is: The step includes sending a control plane message to the core network device.

[0029] In relation to some embodiments of the second aspect, in some embodiments, the step of sending a first message to the core network device is: The step includes sending a user plane message to the core network device.

[0030] In relation to some embodiments of the second aspect, in some embodiments, the step of sending a first message to the core network device is: The process includes sending an inactive state transition report message for the terminal device to the core network device.

[0031] In relation to some embodiments of the second aspect, in some embodiments, the step of sending an inactive state transition report message of the terminal device to the core network device is: The process includes the step of transitioning the terminal to an inactive state and sending the inactive state transition report message to the core network device.

[0032] In relation to some embodiments of the second embodiment, in some embodiments, the method further, The step includes receiving the downlink information corresponding to the small data transmission transmitted by the core network device based on the first information.

[0033] In relation to some embodiments of the second embodiment, in some embodiments, the method further, The process includes transmitting the downlink information transmitted by the core network device to the terminal device via small data transmission.

[0034] In relation to some embodiments of the second embodiment, in some embodiments, the method further, The process includes the step of determining whether or not to transmit a third piece of information to the core network device based on the second piece of information, The third piece of information is used to notify the core network device that the terminal device can receive the downlink information. The downlink information includes signaling and / or data buffered for the core network device to perform incoming communications of the core network-based mobile station.

[0035] In relation to some embodiments of the second embodiment, in some embodiments, the aforementioned second information is Second instruction information that signals the start of buffering, A second type of information corresponding to the buffered downlink information, Time information corresponding to the buffered downlink information, The data size corresponding to the buffered downlink information, A third protocol data unit session identifier corresponding to the buffered downlink information, and A third quality of service flow identifier corresponding to the buffered downlink information, It includes at least one of the following.

[0036] In relation to some embodiments of the second aspect, in some embodiments, the step of receiving second information transmitted by the core network device is: The step includes receiving a second message transmitted by the core network device, The second message carries the second information.

[0037] In relation to some embodiments of the second aspect, in some embodiments, the step of receiving a second message transmitted by the core network device is: The step includes receiving a control plane message transmitted by the core network device.

[0038] In relation to some embodiments of the second aspect, in some embodiments, the step of receiving a second message transmitted by the core network device is: The step includes receiving user plane messages transmitted by the core network device.

[0039] In relation to some embodiments of the second embodiment, in some embodiments, the method further, The step of deciding to transmit the third information to the core network device, The step of transmitting the third information to the core network device includes, The third piece of information is generated based on the second piece of information.

[0040] In relation to some embodiments of the second embodiment, in some embodiments, the third information is A third instruction information for notifying the core network device that the terminal device can receive the downlink information, A third type of information corresponding to the downlink information that the terminal device can receive, A fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive, and A fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive, It includes at least one of the following.

[0041] In relation to some embodiments of the second embodiment, in some embodiments, the method further, The step includes receiving the downlink information corresponding to the small data transmission transmitted by the core network device based on the third information.

[0042] In relation to some embodiments of the second embodiment, in some embodiments, the method further, The process includes transmitting the downlink information transmitted by the core network device to the terminal device via small data transmission.

[0043] In a third embodiment, an embodiment of the present disclosure provides a data transmission method performed by a communication system including an access network device, a core network device, and a terminal device. The method is The process includes the steps of: the access network device sending a first message to the core network device and the core network device receiving the first information; or the core network device sending a second information to the access network device and the access network device receiving the second information. The first piece of information mentioned above relates to the settings for small data transmission of the terminal device, The second piece of information mentioned above relates to incoming communications of core network-based mobile stations.

[0044] In a fourth embodiment, an embodiment of the present disclosure provides a data transmission device. The data transmission device is Includes a first receiving module configured to receive first information transmitted by an access network device, or a first transmitting module configured to transmit second information to the access network device, The first piece of information mentioned above relates to the settings for small data transmission of the terminal device, The second piece of information mentioned above relates to incoming communications of core network-based mobile stations.

[0045] In a fifth embodiment, an embodiment of the present disclosure provides a data transmission device. The data transmission device is The system includes a second transmitting module configured to transmit first information to a core network device, or a second receiving module configured to receive second information transmitted by the core network device. The first piece of information mentioned above relates to the settings for small data transmission of the terminal device, The second piece of information mentioned above relates to incoming communications of core network-based mobile stations.

[0046] In a sixth embodiment, an embodiment of the present disclosure provides a communication device. The communication device is Includes one or more processors, The processor is configured to call computer instructions to cause the communication device to execute the data transmission method described in any embodiment of the first and second aspects.

[0047] In a seventh embodiment, an embodiment of the present disclosure provides a communication system comprising an access network device and a core network device, wherein the access network device is configured to perform a data transmission method described in any embodiment of the first embodiment, and the core network device is configured to perform a data transmission method described in any embodiment of the second embodiment.

[0048] In an eighth embodiment, an embodiment of the present disclosure provides a computer-readable storage medium for storing computer instructions. When the computer instructions are executed on a communication device, the communication device performs a data transmission method as described in any embodiment of the first and second embodiments.

[0049] The technical solutions provided by embodiments of this disclosure may include the following advantageous effects: by receiving first information transmitted by an access network device relating to the small data transmission settings of a terminal device, or by transmitting second information to the access network device relating to incoming communications of a core network-based mobile station, the core network device can take into account the small data transmission settings of a terminal device when processing downlink information of a terminal device, and the access network device can obtain information regarding incoming communications of a core network-based mobile station.

[0050] Please understand that the above summary and the following detailed explanation are for illustrative purposes only and do not limit this disclosure. [Brief explanation of the drawing]

[0051] To more clearly illustrate the technical concepts in the embodiments of this disclosure, the following drawings are necessary for describing the embodiments. The following drawings merely illustrate some of the embodiments of this disclosure and do not specifically limit the scope of protection of this disclosure.

[0052] [Figure 1a] Figure 1a is a schematic diagram showing the configuration of a communication system according to an embodiment of the present disclosure. [Figure 1b] Figure 1b is a schematic diagram of another communication system according to an embodiment of the present disclosure. [Figure 2a] Figure 2a is a flowchart of a data transmission method according to an embodiment of the present disclosure. [Figure 2b]Figure 2b is a flowchart of another data transmission method according to an embodiment of the present disclosure. [Figure 2c] Figure 2c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 2d] Figure 2d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 2e] Figure 2e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 2f] Figure 2f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 2g] Figure 2g is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 3a] Figure 3a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 3b] Figure 3b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 3c] Figure 3c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 3d] Figure 3d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 3e] Figure 3e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 3f] Figure 3f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 4a] Figure 4a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 4b] Figure 4b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 4c] Figure 4c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 4d]Figure 4d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 4e] Figure 4e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 4f] Figure 4f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 4g] Figure 4g is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5a] Figure 5a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5b] Figure 5b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5c] Figure 5c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5d] Figure 5d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5e] Figure 5e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5f] Figure 5f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5g] Figure 5g is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 5h] Figure 5h is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 6a] Figure 6a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 6b] Figure 6b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. [Figure 7a] Figure 7a is a block diagram of a data transmission device 1000 according to an embodiment of the present disclosure. [Figure 7b]Figure 7b is a block diagram of another data transmission device 1100 according to an embodiment of the present disclosure. [Figure 8a] Figure 8a is a block diagram of yet another data transmission device 2000 according to an embodiment of the present disclosure. [Figure 8b] Figure 8b is a block diagram of yet another data transmission device 2100 according to an embodiment of the present disclosure. [Figure 9] Figure 9 is a block diagram of a communication device according to an embodiment of the present disclosure. [Modes for carrying out the invention]

[0053] Embodiments of this disclosure provide "data transmission methods, apparatus, storage media, communication devices, and communication systems." In some embodiments, the terms "data transmission method," "information processing method," and "communication method" are used interchangeably, the terms "data transmission apparatus," "information processing apparatus," and "communication apparatus" are used interchangeably, and the terms "communication system," "information processing system," and "communication system" are used interchangeably.

[0054] The embodiments described herein are not exhaustive and are merely illustrative examples, not intended to limit the scope of protection of this disclosure. Unless otherwise consistent, each step in the embodiments can be performed as an independent embodiment, and these steps can be combined in any way. For example, a solution with some steps omitted from the embodiments can also be performed as an independent embodiment, and the order of the steps in the embodiments can be changed. Furthermore, any embodiment in the embodiments can be combined in any way. Furthermore, each embodiment can be combined in any way. For example, some or all steps from different embodiments can be combined in any way, and one embodiment can be combined in any way with any embodiment of another embodiment.

[0055] The terms used in the embodiments of this disclosure are intended solely to describe specific embodiments and do not limit the disclosure. In the embodiments of this disclosure, singular expressions such as "one," "this," "above," "above," "as mentioned above," and "that" also include plural forms unless explicitly stated otherwise in the context. In the embodiments of this disclosure, "plural" means two or more.

[0056] In embodiments of this disclosure, prefixes such as “first” and “second” are used solely to distinguish different subjects and do not limit the location, order, priority, number, or content of the subjects. For descriptions of the subjects, please refer to the claims or the contextual descriptions of the embodiments. The use of prefixes does not constitute an unnecessary limitation. For example, if the subject is a “field,” the ordinal number preceding “field” in “first field” and “second field” does not limit the location or order of the “field.” “First” and “second” do not limit whether the modified “fields” are in the same message, nor do they limit the order of “first field” and “second field.” As another example, if the subject is a “level,” the ordinal number preceding “level” in “first level” and “second level” does not limit the priority of the “level.” As yet another example, the number of subjects is not limited by ordinal number and can be one or more. For example, in “first device,” the number of “devices” can be one or more. Furthermore, the objects modified by different prefixes may be the same or different. For example, if the object described is "device," then "the first device" and "the second device" may be the same device or different devices, and may be of the same or different types. As another example, if the object described is "information," then "the first piece of information" and "the second piece of information" may be the same piece of information or different pieces of information, and may have the same or different content.

[0057] In embodiments of this disclosure, phrases such as “at least one of A, B, C…” or “A and / or B and / or C…” include any one of A, B, C… and any combination of any number of A, B, C…, each of which may exist independently. For example, “at least one of A, B, C” includes A alone, B alone, C alone, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C. For example, “A and / or B” includes A alone, B alone, and a combination of A and B.

[0058] In some embodiments, expressions such as "A in one case, B in another" or "A in response to one case, B in response to another" can include, depending on the situation, the following technical solutions: running A independently of B (A in some embodiments), running B independently of A (B in some embodiments), selectively running A and B (choosing between A and B in some embodiments), and running both A and B (A and B in some embodiments). The same applies when there are multiple branches such as A, B, C, etc.

[0059] In some embodiments, “containing A,” “containing A,” “used to indicate A,” or “transporting A” can be interpreted as directly transporting A or indirectly indicating A.

[0060] In some of these examples, terms such as "depending on," "in accordance with the decision to," "in the case of," "when," "when," "if," "if," and "if" can be used interchangeably.

[0061] In some examples, terms such as “greater,” “greater than or equal to,” “not less than,” “more,” “more or equal to,” “not less,” “higher,” “higher or equal to,” “not lower,” and “greater than or equal to,” are used interchangeably, while terms such as “less than,” “less or equal to,” “not greater than,” “less than,” “less or equal to,” “not more,” “lower,” “lower or equal to,” “not higher,” and “less than or equal to,” are used interchangeably.

[0062] In some applications, terms such as "radio," "wireless," "Radio Access Network (RAN)," "Access Network (AN)," and "RAN-based" are used interchangeably.

[0063] In some embodiments, “predetermined” and “pre-configured” can be interpreted as pre-specified in the protocol or pre-configured actions performed by a device or the like.

[0064] In some embodiments, devices and the like can be interpreted as physical or virtual, and their names are not limited to those described in the embodiments. Terms such as “device,” “equipment,” “device,” “network element,” “node,” “function,” “unit,” “entity,” “system,” “chip,” “chip system,” and “subject” are used interchangeably.

[0065] In some embodiments, the names of information and other terms are not limited to those described in the embodiments. Terms such as "information," "message," "signaling," "report," "configuration," "instruction," "parameter," and "data" are used interchangeably.

[0066] In some embodiments, terms such as "instruction" and "program" are used interchangeably.

[0067] In some embodiments, terms such as “acquire,” “gain,” “obtain,” “receive,” and “transmit (send and / or receive)” are used interchangeably and can be interpreted in various ways, including receiving from another entity, obtaining from a protocol, obtaining through self-processing, and performing autonomous actions.

[0068] In some instances, terms such as “send,” “report,” “notify,” and “transmit (send and / or receive)” are used interchangeably.

[0069] In some instances, obtaining data, information, etc., may comply with the laws and regulations of the country of residence.

[0070] In some embodiments, data, information, etc., may be acquired with the user's consent.

[0071] Furthermore, each element, row, or column in the table of embodiments of this disclosure can be implemented as an independent embodiment, and any combination of any element, row, or column can also be implemented as an independent embodiment.

[0072] Please note that all operations to obtain signals, information, or data in this disclosure are carried out in accordance with the applicable data protection laws and policies of your country of residence and with the permission of the corresponding device owner.

[0073] In the diagrams of the embodiments of this disclosure, operations are described in a specific order, but this should not be interpreted as requiring these operations to be performed in a specific order or sequence as shown, nor should it be interpreted as requiring all shown operations to be performed in order to obtain the desired result. In certain circumstances, multitasking and parallel processing may be advantageous. Furthermore, sending multiple pieces of information in the same message may also be advantageous.

[0074] The following describes the application environment for the data transmission method provided in this embodiment. Figure 1a is a schematic diagram showing the configuration of a communication system according to an embodiment of the present disclosure. As shown in Figure 1a, the communication system 100 includes a terminal device 101, an access network (RAN) device 102, and a core network device 103.

[0075] In some embodiments, the communication system 100 is, for example, a long-term evolution (LTE) system, a fifth-generation (5G) mobile communication system, a 5G new radio (NR) system, or other future communication system, but is not limited to these.

[0076] In some embodiments, the terminal device 101 is, but is not limited to, a user device (UE), a mobile station (MS), a mobile terminal (MT), a mobile phone, a wearable device, an IoT device, a car with communication capabilities, a smart car, a tablet computer (Pad), a computer with wireless transceiver functionality, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device used in industrial control, a wireless terminal device used in self-driving, a wireless terminal device used in remote medical surgery, a wireless terminal device used in a smart grid, a wireless terminal device used in transportation safety, a wireless terminal device used in a smart city, or a wireless terminal device used in a smart home.

[0077] In some embodiments, the access network device 102 may be, for example, a transmission reception point (TRP), an evolved node base station (eNB), a next-generation node base station (gNB) in an NR system, a base station in other future communication systems, or an access node in a wireless fidelity (WiFi) system. In some embodiments, the access network device may consist of a central unit (CU) and a distributed unit (DU). The CU is also called a control unit. The CU-DU architecture allows for the partitioning of the protocol layer of the access network device, with some protocol layer functions centrally controlled by the CU and some or all of the remaining protocol layer functions distributed to the DU, which is centrally controlled by the CU, but is not limited to these configurations.

[0078] In some embodiments, the core network device 103 may be a single device containing one or more network elements, or a group of multiple devices or devices each containing all or part of the functions of the one or more network elements. The network elements may be virtual or physical.

[0079] It should be understood that the communication systems described in the embodiments of this disclosure are intended to more clearly illustrate the technical solutions of the embodiments of this disclosure and are not intended to limit the technical solutions provided by the embodiments of this disclosure. Those skilled in the art will understand that as system architectures evolve and new service scenarios emerge, the technical solutions provided by the embodiments of this disclosure will be similarly applicable to similar technical problems.

[0080] The embodiments of this disclosure described below may be applied to, but are not limited to, the communication system 100 shown in Figure 1, or to some of its components. The components shown in Figure 1 are for illustrative purposes only. The communication system may include all or some of the components shown in Figure 1, or components other than those shown in Figure 1, the number of components is arbitrary, and the connections between components are for illustrative purposes only. The components may be connected or disconnected, and the connections may be direct, indirect, wired, or wireless. Furthermore, the names of the communication system and its components are not limited.

[0081] Figure 1b is a schematic diagram of another communication system according to an embodiment of the present disclosure. As shown in Figure 1b, the communication system includes a terminal device, an access network device, an Access and Mobility Management Function (AMF) network element, a Session Management Function (SMF) network element, and a User Plane Function (UPF) network element. Here, it is understood that the core network device includes multiple network elements, but the figure shows only the Access and Mobility Management Function network element, the Session Management Function network element, and the User Plane Function network element.

[0082] In some embodiments, access and mobility management function network elements are used for access and mobility management of terminal devices in a mobile network and include, but are not limited to, providing session management message transmission channels between terminal devices and session management functions, providing authentication and authorization for access to terminal devices, and maintaining core network control plane access points for terminal devices and access network devices.

[0083] In some embodiments, session management functional network elements are used for session management of terminal devices in a mobile network, including, but are not limited to, maintaining tunnels, assigning and managing terminal devices addresses, selecting and controlling user plane functional network elements, enforcing policies, and controlling quality of service (QoS). In some embodiments, user plane functional network elements are used for routing and forwarding user plane data packets, including packet routing and forwarding, policy enforcement, traffic reporting, and quality of service processing, but their names are not limited to these.

[0084] In some embodiments, the access network device provides the core network device with an extended discontinuous reception (eDRX) period parameter configured for the terminal device. When downlink information arrives, network elements within the core network device, such as access and mobility management function network elements, determine the reachability of the terminal device based on the extended discontinuous reception period parameter. If it is determined that the terminal device is unreachable, the access and mobility management function network elements estimate a waiting time, buffer the downlink information, and notify other network elements. For example, the session management function network element and the user plane function network element buffer the downlink information. If it is determined that the downlink information is reachable, the access network device notifies the terminal device to switch to a connected state, and the access network device calls the terminal device to complete the transmission of the downlink information. This enables core network-based mobile terminated communication (also known as CN-based MT communication). This communication is also, without limitation, known as high-latency communication functions.

[0085] In some embodiments, when a terminal device is inactive, the access network device requests and receives downlink small data destined for the terminal device from the network elements of the core network device (e.g., user plane functional network elements) based on the Small Data Transmission (SDT) configured on the terminal device, and triggers small data transmission paging. In response to paging, the terminal device sends a request to the access network device, receives the small data sent from the access network device, and then sends uplink small data to the user plane functional network elements via the access network device. This enables small data transmission. This small data transmission is also referred to, for example, Mobile Terminated Small Data Transmission (MT-SDT), and is not limited to this term.

[0086] Based on the above embodiment, when a network element within the core network device (e.g., an access and mobility management function network element) determines that a terminal device is unreachable, it chooses to buffer the downlink information. In this case, if the terminal device is configured for small data transmission, the small data as downlink information is buffered on the core network side rather than being sent to the terminal device based on small data transmission.

[0087] Figure 2a is a flowchart of a data transmission method according to an embodiment of the present disclosure. As shown in Figure 2a, this data transmission method can be used in a core network device and includes the following steps.

[0088] Step S210a: Receive the first piece of information transmitted by the access network device.

[0089] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0090] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit (PDU) session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0091] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0092] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0093] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0094] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0095] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0096] In some embodiments, threshold information indicates the data volume of information that can be transmitted by small data transmission configured on the terminal device.

[0097] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0098] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0099] In some embodiments, the first information includes the MT-SDT and / or MO-SDT (Mobile Originated-SDT) configuration information of the terminal device.

[0100] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0101] In some embodiments, an access and mobility management function network element receives first information transmitted by an access network device.

[0102] In some embodiments, a session management function network element receives first information transmitted by an access network device.

[0103] In some embodiments, a user plane functional network element receives first information transmitted by an access network device.

[0104] In some embodiments, an access network device receives a first message, where the first message carries first information, and the first information relates to the settings for small data transmission of a terminal device.

[0105] In some embodiments, the first message is a control plane (CP) message, and the core network device receives the control plane message sent by the access network device.

[0106] In some embodiments, the first message is a User Plane (UP) message, and the core network device receives the User Plane message sent by the access network device.

[0107] In some embodiments, the first message is an inactive state transition report message, and the core network device receives the inactive state transition report message for the terminal device sent by the access network device. In some embodiments, the inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0108] According to embodiments of this disclosure, a core network device receives first information transmitted by an access network device, the first information relating to the small data transmission settings of a terminal device. Based on the above first information, the core network device can obtain the small data transmission settings of the terminal device. Therefore, it is understood that the core network device can perform data transmission with the terminal device based on these settings.

[0109] Figure 2b is a flowchart of another data transmission method according to an embodiment of the present disclosure. As shown in Figure 2b, this data transmission method can be used in a core network device and includes the following steps.

[0110] Step S210b: Receive the first piece of information sent by the access network device.

[0111] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0112] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0113] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0114] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0115] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device. In some embodiments, the first information type corresponding to the small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0116] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0117] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0118] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0119] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0120] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0121] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0122] In some embodiments, an access and mobility management function network element receives first information transmitted by an access network device.

[0123] In some embodiments, a session management function network element receives first information transmitted by an access network device.

[0124] In some embodiments, a user plane functional network element receives first information transmitted by an access network device.

[0125] In some embodiments, an access network device receives a first message, where the first message carries first information, and the first information relates to the settings for small data transmission of a terminal device.

[0126] In some embodiments, the first message is a control plane message, and the core network device receives the control plane message sent by the access network device.

[0127] In some embodiments, the first message is a user plane message, and the core network device receives the user plane message sent by the access network device.

[0128] In some embodiments, the first message is an inactive state transition report message, and the core network device receives the inactive state transition report message for the terminal device sent by the access network device. In some embodiments, the inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0129] Step S220b: Based on the first information, a decision is made as to whether or not to transmit the buffered downlink information.

[0130] Here, downlink information includes buffered signaling and / or data for executing incoming communications for core network-based mobile stations.

[0131] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes determining that small data transmission is configured on the terminal device based on first instruction information, and transmitting downlink information corresponding to small data transmission.

[0132] Here, the first information includes at least first instruction information indicating whether or not small data transmission is configured on the terminal device. Selectively, the first information may further include at least one of the following: a first information type corresponding to small data transmission configured on the terminal device; an extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0133] Here, selectively, if it is determined that small data transmission is configured on the terminal device based on the first instruction information, downlink information corresponding to small data transmission is transmitted. Selectively, in response to the determination that small data transmission is configured on the terminal device based on the first instruction information, downlink information corresponding to small data transmission is transmitted. Selectively, when it is determined that small data transmission is configured on the terminal device based on the first instruction information, downlink information corresponding to small data transmission is transmitted.

[0134] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes determining that small data transmission is configured on the terminal device based on first instruction information, and transmitting downlink information corresponding to small data transmission, where the information within the downlink information belongs to a first information type.

[0135] Here, the first information includes at least a first instruction information indicating whether or not small data transmission is configured on the terminal device, and a first information type corresponding to the small data transmission configured on the terminal device. Selectively, the first information may further include at least one of the following: an extended intermittent reception period parameter configured on the terminal device, threshold information corresponding to the small data transmission configured on the terminal device, a first protocol data unit session identifier corresponding to the small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to the small data transmission configured on the terminal device.

[0136] Here, selectively, based on the first instruction information, if it is determined that small data transmission is configured on the terminal device and the information in the downlink information belongs to the first information type, downlink information corresponding to small data transmission is transmitted. Selectively, based on the first instruction information, if it is determined that small data transmission is configured on the terminal device and the information in the downlink information belongs to the first information type, downlink information corresponding to small data transmission is transmitted. Selectively, based on the first instruction information, if it is determined that small data transmission is configured on the terminal device and the information in the downlink information belongs to the first information type, downlink information corresponding to small data transmission is transmitted.

[0137] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0138] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0139] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes determining that small data transmission is configured on the terminal device based on first instruction information, and transmitting downlink information corresponding to small data transmission if the information in the downlink information belongs to a first information type and the extended intermittent reception period, represented by the extended intermittent reception period parameter, is greater than or equal to a preset period.

[0140] Here, the first information includes at least a first instruction information indicating whether or not small data transmission is configured on the terminal device, a first information type corresponding to the small data transmission configured on the terminal device, and an extended intermittent reception period parameter configured on the terminal device. Selectively, the first information may further include at least one of the following: threshold information corresponding to the small data transmission configured on the terminal device, a first protocol data unit session identifier corresponding to the small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to the small data transmission configured on the terminal device.

[0141] Here, selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and if the information in the downlink information belongs to the first information type and the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, downlink information corresponding to small data transmission is transmitted. Selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and if the information in the downlink information belongs to the first information type and the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, downlink information corresponding to small data transmission is transmitted. Selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and if the information in the downlink information belongs to the first information type and the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, downlink information corresponding to small data transmission is transmitted.

[0142] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0143] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0144] In some embodiments, the preset period is 10.24 seconds or greater than 10.24 seconds.

[0145] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes determining that small data transmission is configured on the terminal device based on first instruction information, and transmitting downlink information corresponding to small data transmission if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to a data threshold represented by threshold information.

[0146] Here, the first information includes at least a first instruction information indicating whether or not small data transmission is configured on the terminal device, a first information type corresponding to the small data transmission configured on the terminal device, an extended intermittent reception period parameter configured on the terminal device, and threshold information corresponding to the small data transmission configured on the terminal device. Selectively, the first information may further include at least one of a first protocol data unit session identifier corresponding to the small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to the small data transmission configured on the terminal device.

[0147] Here, selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and if the information in the downlink information belongs to the first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, then downlink information corresponding to small data transmission is transmitted. Selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and if the information in the downlink information belongs to the first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, then downlink information corresponding to small data transmission is transmitted. Selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and if the information in the downlink information belongs to the first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, then downlink information corresponding to small data transmission is transmitted.

[0148] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0149] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0150] In some embodiments, the preset period is 10.24 seconds or greater than 10.24 seconds.

[0151] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes determining that small data transmission is configured on a terminal device based on first instruction information, and transmitting downlink information corresponding to small data transmission, wherein the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to a data threshold represented by threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0152] Here, the first information includes at least a first instruction information indicating whether or not small data transmission is configured on the terminal device, a first information type corresponding to the small data transmission configured on the terminal device, an extended intermittent reception period parameter configured on the terminal device, threshold information corresponding to the small data transmission configured on the terminal device, a first protocol data unit session identifier corresponding to the small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to the small data transmission configured on the terminal device.

[0153] Here, selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and the information in the downlink information belongs to the first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier, then downlink information corresponding to small data transmission is transmitted. Selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to the first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.Selectively, based on the first instruction information, it is determined that small data transmission is configured on the terminal device, and when the information in the downlink information belongs to the first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier, downlink information corresponding to small data transmission is transmitted.

[0154] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0155] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0156] In some embodiments, the preset period is 10.24 seconds or greater than 10.24 seconds.

[0157] In some embodiments, downlink information corresponding to small data transmission is transmitted if the second protocol data unit session identifier matches the first protocol data unit session identifier, or if the second quality of service flow identifier matches the first quality of service flow identifier, and the other conditions of the embodiments described above are met.

[0158] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes the step of transmitting downlink information that belongs to a first information type and corresponds to small data transmission.

[0159] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device. Selectively, the first information may further include at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; extended intermittent reception period parameters configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0160] Here, selectively, if the information within the downlink information belongs to the first information type, downlink information corresponding to small data transmission is transmitted. Selectively, depending on whether the information within the downlink information belongs to the first information type, downlink information corresponding to small data transmission is transmitted. Selectively, if the information within the downlink information belongs to the first information type, downlink information corresponding to small data transmission is transmitted.

[0161] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes transmitting downlink information corresponding to small data transmission if the information in the downlink information belongs to a first information type and the extended intermittent reception period, represented by the extended intermittent reception period parameter, is greater than or equal to a preset period.

[0162] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device, and an extended intermittent reception period parameter configured on the terminal device. Selectively, the first information may further include at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device, threshold information corresponding to small data transmission configured on the terminal device, a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0163] Here, selectively, if the information in the downlink information belongs to a first information type and the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, downlink information corresponding to small data transmission is transmitted. Selectively, if the information in the downlink information belongs to a first information type and the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, downlink information corresponding to small data transmission is transmitted. Selectively, if the information in the downlink information belongs to a first information type and the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, downlink information corresponding to small data transmission is transmitted.

[0164] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0165] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0166] In some embodiments, the preset period is 10.24 seconds or greater than 10.24 seconds.

[0167] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes transmitting downlink information corresponding to small data transmission if the information in the downlink information belongs to a first information type, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information.

[0168] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device, and threshold information corresponding to small data transmission configured on the terminal device. Selectively, the first information may further include at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device, an extended intermittent reception period parameter configured on the terminal device, a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0169] Here, selectively, if the information in the downlink information belongs to a first information type, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, downlink information corresponding to small data transmission is transmitted. Selectively, if the information in the downlink information belongs to a first information type, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, downlink information corresponding to small data transmission is transmitted. Selectively, if the information in the downlink information belongs to a first information type, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, downlink information corresponding to small data transmission is transmitted.

[0170] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0171] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0172] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes transmitting downlink information corresponding to small data transmission, wherein the information in the downlink information belongs to a first information type, a second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and a second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0173] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device, a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device. Optionally, the first information may further include at least one of the following: first instruction information indicating whether small data transmission is configured on the terminal device, an extended intermittent reception period parameter configured on the terminal device, and threshold information corresponding to small data transmission configured on the terminal device.

[0174] Here, selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted when the information in the downlink information belongs to a first information type, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0175] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0176] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0177] In some embodiments, downlink information corresponding to small data transmission is transmitted if the second protocol data unit session identifier matches the first protocol data unit session identifier, or if the second quality of service flow identifier matches the first quality of service flow identifier, and the other conditions of the embodiments described above are met.

[0178] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The procedure includes transmitting downlink information corresponding to small data transmission if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to a data threshold represented by threshold information.

[0179] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device, an extended intermittent reception period parameter configured on the terminal device, and threshold information corresponding to small data transmission configured on the terminal device. Selectively, the first information may further include at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device, a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0180] Here, selectively, if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, then downlink information corresponding to small data transmission is transmitted. Selectively, if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, then downlink information corresponding to small data transmission is transmitted. Selectively, if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, and the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, then downlink information corresponding to small data transmission is transmitted.

[0181] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0182] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0183] In some embodiments, the preset period is 10.24 seconds or greater than 10.24 seconds.

[0184] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes transmitting downlink information corresponding to small data transmission, wherein the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0185] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device, an extended intermittent reception period parameter configured on the terminal device, a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device. Optionally, the first information may further include at least one of first instruction information indicating whether small data transmission is configured on the terminal device, and threshold information corresponding to small data transmission configured on the terminal device.

[0186] Here, selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted when the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0187] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0188] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0189] In some embodiments, the preset period is 10.24 seconds or greater than 10.24 seconds.

[0190] In some embodiments, downlink information corresponding to small data transmission is transmitted if the second protocol data unit session identifier matches the first protocol data unit session identifier, or if the second quality of service flow identifier matches the first quality of service flow identifier, and the other conditions of the embodiments described above are met.

[0191] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes transmitting downlink information corresponding to small data transmission, wherein the information in the downlink information belongs to a first information type, the data size of the information belonging to the first information type in the downlink information is less than or equal to a data threshold represented by threshold information, a second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and a second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0192] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device, threshold information corresponding to small data transmission configured on the terminal device, a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device. Optionally, the first information may further include at least one of first instruction information indicating whether small data transmission is configured on the terminal device, and an extended intermittent receive period parameter configured on the terminal device.

[0193] Here, selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted when the information in the downlink information belongs to a first information type, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0194] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0195] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0196] In some embodiments, downlink information corresponding to small data transmission is transmitted if the second protocol data unit session identifier matches the first protocol data unit session identifier, or if the second quality of service flow identifier matches the first quality of service flow identifier, and the other conditions of the embodiments described above are met.

[0197] In some embodiments, the step of determining whether or not to transmit buffered downlink information based on first information is: The process includes transmitting downlink information corresponding to small data transmission, wherein the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to a data threshold represented by threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0198] Here, the first information includes at least a first information type corresponding to small data transmission configured on the terminal device, an extended intermittent reception period parameter configured on the terminal device, threshold information corresponding to small data transmission configured on the terminal device, a first protocol data unit session identifier corresponding to small data transmission configured on the terminal device, and a first quality of service flow identifier corresponding to small data transmission configured on the terminal device. Optionally, the first information may further include first instruction information indicating whether or not small data transmission is configured on the terminal device.

[0199] Here, selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted if the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier. Selectively, downlink information corresponding to small data transmission is transmitted when the information in the downlink information belongs to a first information type, the extended intermittent reception period represented by the extended intermittent reception period parameter is greater than or equal to a preset period, the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0200] In some embodiments, the information in the downlink information belonging to a first information type includes the information in the downlink information belonging to signaling corresponding to small data transmission configured on the terminal device, and the information in the downlink information belonging to data corresponding to small data transmission configured on the terminal device.

[0201] In some embodiments, downlink information corresponding to small data transmission is transmitted if at least a portion of the information in the downlink information belongs to the first information type and the other conditions of the above embodiments are met.

[0202] In some embodiments, the preset period is 10.24 seconds or greater than 10.24 seconds.

[0203] In some embodiments, downlink information corresponding to small data transmission is transmitted if the second protocol data unit session identifier matches the first protocol data unit session identifier, or if the second quality of service flow identifier matches the first quality of service flow identifier, and the other conditions of the embodiments described above are met.

[0204] In some embodiments, the core network device will not transmit buffered downlink information if it determines that at least one of the following conditions is met: small data transmission is not configured on the terminal device; the downlink information does not belong to a first information type; the extended intermittent reception period, represented by the extended intermittent reception period parameter, is smaller than a preset period; the data size of the information belonging to the first information type in the downlink information is greater than the data threshold represented by the threshold information; the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information does not match the first protocol data unit session identifier; and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information does not match the first quality of service flow identifier.

[0205] According to the embodiments of this disclosure, the core network device The access network device receives first information transmitted by the access network device and, based on this first information, decides whether or not to transmit buffered downlink information, the first information relating to the small data transmission settings of the terminal device. Based on the above first information, the core network device can obtain the small data transmission settings of the terminal device and decide whether or not to transmit buffered downlink information to the terminal device. This enables small data transmission by the terminal device, ensuring the arrival of downlink information, reducing the memory overhead of the core network, reducing the need for the core network to page terminals into connected states due to insufficient memory, and also reducing signaling overhead and device power consumption.

[0206] Figure 2c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 2c, this data transmission method can be used in a core network device and includes the following steps.

[0207] Step S2101c: Receive the first message sent by the access network device.

[0208] Here, the first message carries the first piece of information, which relates to the settings for small data transmission on the terminal device.

[0209] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0210] In some embodiments, an access and mobility management function network element receives a first message transmitted by an access network device.

[0211] In some embodiments, a session management network element receives a first message sent by an access network device.

[0212] In some embodiments, a user plane functional network element receives a first message transmitted by an access network device.

[0213] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0214] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0215] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0216] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0217] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0218] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0219] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0220] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0221] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0222] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0223] According to embodiments of this disclosure, a core network device receives a first message transmitted by an access network device and, based on the first message, obtains the small data transmission settings of a terminal device. It is understood that the core network device can then perform data transmission with the terminal device based on these settings.

[0224] Figure 2d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 2d, this data transmission method can be used in a core network device and includes the following steps.

[0225] Step S2101d: Receive a control plane message sent by an access network device.

[0226] Here, the control plane message carries first information, which relates to the settings for small data transmission of the terminal device.

[0227] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0228] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0229] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0230] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0231] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0232] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0233] In some embodiments, the threshold information indicates the data volume of information that can be transmitted by small data transmission set in the terminal device.

[0234] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission set in the terminal device.

[0235] In some embodiments, the first quality of service flow identifier indicates a quality of service flow that supports small data transmission set in the terminal device.

[0236] In some embodiments, the first information includes the MT-SDT and / or MO-SDT setting information of the terminal device.

[0237] In some embodiments, the control plane message is a Next Generation Application Protocol (NGAP) message.

[0238] According to an embodiment of the present disclosure, the core network device receives a control plane message sent by the access network device, and obtains the setting of small data transmission of the terminal device based on the control plane message. Therefore, it is understood that the core network device can perform data transmission with the terminal device based on this setting.

[0239] FIG. 2e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in FIG. 2e, this data transmission method can be used in a core network device and includes the following steps.

[0240] Step S2101e: Receive a user plane message sent by the access network device.

[0241] Here, the first message carries the first piece of information, which relates to the settings for small data transmission on the terminal device.

[0242] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0243] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0244] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0245] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0246] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0247] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0248] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0249] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0250] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0251] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0252] In some embodiments, user plane messages are General-Purpose Packet Radio Services Tunneling Protocol (GPRS Tunneling Protocol-User plane, GTP-U) messages of the user plane. Exemplary, the header of a General-Purpose Packet Radio Services Tunneling Protocol message of the user plane carries first information.

[0253] According to embodiments of this disclosure, a core network device receives user plane messages transmitted by an access network device and obtains the small data transmission settings of a terminal device based on the user plane messages. Therefore, it is understood that the core network device can perform data transmission with the terminal device based on these settings.

[0254] Figure 2f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 2f, this data transmission method can be used in a core network device and includes the following steps.

[0255] Step S2101f: Receive the inactive state transition report message of the terminal device sent by the access network device.

[0256] Here, this inactive state transition report message carries the first information, and the first information is related to the settings of the small data transmission of the terminal device.

[0257] In some embodiments, the first information includes at least one of the first indication information indicating whether small data transmission is set in the terminal device, the first information type corresponding to the small data transmission set in the terminal device, the extended intermittent reception period parameter set in the terminal device, the threshold information corresponding to the small data transmission set in the terminal device, the first protocol data unit session identifier corresponding to the small data transmission set in the terminal device, and the first quality of service flow identifier corresponding to the small data transmission set in the terminal device.

[0258] In some embodiments, the first information type indicates the information type of the information that can be transmitted by the small data transmission set in the terminal device.

[0259] In some embodiments, the first information type corresponding to the small data transmission set in the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0260] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission set in the terminal device.

[0261] In some embodiments, the first information type corresponding to the small data transmission set in the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0262] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0263] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0264] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0265] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0266] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0267] In some embodiments, an inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0268] According to embodiments of this disclosure, a core network device receives an inactive state transition report message from an access network device for a terminal device and obtains the small data transmission settings of the terminal device based on the inactive state transition report message. Therefore, it is understood that the core network device can perform data transmission with terminal devices based on these settings, and selectively perform data transmission with terminal devices that are in an inactive state based on these settings.

[0269] Figure 2g is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 2g, this data transmission method can be used in a core network device and includes the following steps.

[0270] Step S210g: Receive the first piece of information transmitted by the access network device.

[0271] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0272] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0273] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0274] In some embodiments, an access and mobility management function network element receives first information transmitted by an access network device.

[0275] In some embodiments, a session management function network element receives first information transmitted by an access network device.

[0276] In some embodiments, a user plane functional network element receives first information transmitted by an access network device.

[0277] In some embodiments, an access network device receives a first message, where the first message carries first information, and the first information relates to the settings for small data transmission of a terminal device.

[0278] In some embodiments, the first message is a control plane message, and the core network device receives the control plane message sent by the access network device.

[0279] In some embodiments, the first message is a user plane message, and the core network device receives the user plane message sent by the access network device.

[0280] In some embodiments, the first message is an inactive state transition report message, and the core network device receives the inactive state transition report message for the terminal device sent by the access network device. In some embodiments, the inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0281] Step S220g: Based on the first information, it is determined whether or not to transmit the buffered downlink information.

[0282] Here, downlink information includes buffered signaling and / or data for executing incoming communications for core network-based mobile stations.

[0283] Selective embodiments of step S220g are described in the selective embodiment of step S220b in Figure 2b and in other relevant parts of the embodiment relating to Figure 2b, and will not be described further here.

[0284] Step S230g: It is decided to transmit buffered downlink information and, based on the first information, transmits downlink information corresponding to small data transmission to the access network device.

[0285] Here, the core network device decides to transmit buffered downlink information based on the first information, and then transmits downlink information corresponding to the small data transmission configured on the terminal device to the access network device based on the first information.

[0286] If it is decided to selectively transmit buffered downlink information, then, based on the first information, downlink information corresponding to small data transmission is transmitted to the access network device. If it is decided to selectively transmit buffered downlink information, then, based on the first information, downlink information corresponding to small data transmission is transmitted to the access network device. If it is decided to selectively transmit buffered downlink information, then, based on the first information, downlink information corresponding to small data transmission is transmitted to the access network device.

[0287] According to embodiments of this disclosure, a core network device receives first information transmitted by an access network device, determines whether or not to transmit buffered downlink information based on the first information, and transmits downlink information corresponding to small data transmission to the access network device based on the first information, where the first information relates to the small data transmission settings of a terminal device. Based on the above first information, the core network device can obtain the small data transmission settings of the terminal device and determine whether or not to transmit buffered downlink information to the terminal device, and the specific content of the downlink information to be transmitted. This enables small data transmission by the terminal device, ensures the arrival of downlink information, reduces the memory overhead of the core network, reduces the need for the core network to page terminals into a connected state due to insufficient memory, and also reduces signaling overhead and device power consumption.

[0288] Figure 3a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 3a, this data transmission method can be used in a core network device and includes the following steps.

[0289] Step S310a: Send the second piece of information to the access network device.

[0290] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0291] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0292] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0293] In some embodiments, an access and mobility management function network element transmits second information to an access network device.

[0294] In some embodiments, a session management network element transmits second information to an access network device.

[0295] In some embodiments, a user plane functional network element transmits second information to an access network device.

[0296] In some embodiments, a second message is sent to an access network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0297] In some embodiments, the second message is a control plane message, and the core network device sends the control plane message to the access network device.

[0298] In some embodiments, the second message is a user plane message, and the core network device sends the user plane message to the access network device.

[0299] According to embodiments of this disclosure, a core network device transmits second information to an access network device, the second information relating to incoming communications of a core network-based mobile station. Based on the second information, the access network device can understand the core network-side status regarding incoming communications of a core network-based mobile station. It is understood that the access network device can take into account the core network-side status regarding incoming communications of a core network-based mobile station when transmitting data from a terminal device.

[0300] Figure 3b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 3b, this data transmission method can be used in a core network device and includes the following steps.

[0301] Step S3101b: Send a second message to the access network device.

[0302] Here, the second message carries the second piece of information, which relates to incoming communications from a core network-based mobile station.

[0303] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0304] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0305] In some embodiments, an access and mobility management function network element sends a second message to an access network device.

[0306] In some embodiments, a session management network element sends a second message to an access network device.

[0307] In some embodiments, a user plane functional network element sends a second message to an access network device.

[0308] According to embodiments of the present disclosure, a core network device sends a second message to an access network device to notify it of the status of incoming communications of a core network-based mobile station.

[0309] Figure 3c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 3c, this data transmission method can be used in a core network device and includes the following steps.

[0310] Step S3101c: Send a control plane message to the access network device.

[0311] Here, the control plane message carries a second piece of information, which relates to incoming communications from a core network-based mobile station.

[0312] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0313] In some embodiments, control plane messages are next-generation application protocol messages.

[0314] According to embodiments of this disclosure, a core network device sends control plane messages to an access network device to notify it of the status of incoming communications of a core network-based mobile station.

[0315] Figure 3d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 3d, this data transmission method can be used in a core network device and includes the following steps.

[0316] Step S3101d: Send a user plane message to the access network device.

[0317] Here, the user plane message carries second information, which relates to incoming communications from a core network-based mobile station.

[0318] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0319] In some embodiments, the user plane message is a generic packet radio service tunnel protocol message of the user plane, and exemplary, the header of the generic packet radio service tunnel protocol message of the user plane carries second information.

[0320] According to embodiments of this disclosure, a core network device sends user plane messages to an access network device to notify it of the status of incoming communications of a core network-based mobile station.

[0321] Figure 3e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 3e, this data transmission method can be used in a core network device and includes the following steps.

[0322] Step S310e: Send the second piece of information to the access network device.

[0323] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0324] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0325] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0326] In some embodiments, an access and mobility management function network element transmits second information to an access network device.

[0327] In some embodiments, a session management network element transmits second information to an access network device.

[0328] In some embodiments, a user plane functional network element transmits second information to an access network device.

[0329] In some embodiments, a second message is sent to an access network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0330] In some embodiments, the second message is a control plane message, and the core network device sends the control plane message to the access network device.

[0331] In some embodiments, the second message is a user plane message, and the core network device sends the user plane message to the access network device.

[0332] Step S320e: Receive the third piece of information sent by the access network device.

[0333] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0334] In some embodiments, the access network device decides to send a third piece of information to the core network device based on the second piece of information it receives.

[0335] Step S330e: Based on the third piece of information, a decision is made as to whether or not to transmit downlink information corresponding to small data transmission.

[0336] According to embodiments of this disclosure, a core network device transmits second information to an access network device, where the second information relates to incoming communications of a core network-based mobile station. Based on the second information, the access network device can obtain the core network-side status regarding incoming communications of the core network-based mobile station. The core network device receives third information that the access network device has analyzed and transmitted based on the second information, and based on the third information, decides whether or not to transmit downlink information corresponding to small data transmission. This allows the receiving capability of a terminal device for downlink information to be considered when transmitting data from a terminal device.

[0337] Figure 3f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 3f, this data transmission method can be used in a core network device and includes the following steps.

[0338] Step S310f: Send the second piece of information to the access network device.

[0339] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0340] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0341] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0342] In some embodiments, an access and mobility management function network element transmits second information to an access network device.

[0343] In some embodiments, a session management network element transmits second information to an access network device.

[0344] In some embodiments, a user plane functional network element transmits second information to an access network device.

[0345] In some embodiments, a second message is sent to an access network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0346] In some embodiments, the second message is a control plane message, and the core network device sends the control plane message to the access network device.

[0347] In some embodiments, the second message is a user plane message, and the core network device sends the user plane message to the access network device.

[0348] Step S320f: Receive the third piece of information sent by the access network device.

[0349] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0350] In some embodiments, the access network device decides to send a third piece of information to the core network device based on the second piece of information it receives. Step S330f: Based on the third piece of information, a decision is made as to whether or not to transmit downlink information corresponding to small data transmission.

[0351] Step S340f: It is decided to transmit downlink information corresponding to small data transmission, and based on the third piece of information, the downlink information corresponding to small data transmission is transmitted to the access network device.

[0352] Here, the core network device decides to transmit downlink information corresponding to small data transmission based on the third piece of information, and transmits the downlink information corresponding to small data transmission configured on the terminal device to the access network device based on the third piece of information.

[0353] If it is decided here to selectively transmit downlink information corresponding to small data transmission, then, based on the third information, downlink information corresponding to small data transmission is transmitted to the access network device. In response to the decision to selectively transmit downlink information corresponding to small data transmission, downlink information corresponding to small data transmission is transmitted to the access network device based on the third information. When it is decided to selectively transmit downlink information corresponding to small data transmission, then, based on the third information, downlink information corresponding to small data transmission is transmitted to the access network device.

[0354] According to embodiments of this disclosure, a core network device transmits second information to an access network device, where the second information relates to incoming communications of a core network-based mobile station. Based on the second information, the access network device can obtain the status of the core network regarding incoming communications of the core network-based mobile station. The core network device receives third information that the access network device has analyzed and transmitted based on the second information, and based on the third information, decides whether or not to transmit downlink information corresponding to small data transmission. This allows the receiving capability of the terminal device for downlink information to be considered when transmitting data to the terminal device, and allows the transmission of downlink information corresponding to small data transmission configured on the terminal device based on the third information.

[0355] Figure 4a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 4a, this data transmission method can be used in an access network device and includes the following steps.

[0356] Step S410a: Send the first piece of information to the core network device.

[0357] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0358] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0359] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0360] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0361] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0362] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0363] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0364] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0365] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0366] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device. In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0367] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0368] In some embodiments, the first information is transmitted to an access and mobility management function network element.

[0369] In some embodiments, the first information is transmitted to a session management function network element.

[0370] In some embodiments, first information is transmitted to a user plane functional network element.

[0371] In some embodiments, a first message is sent to a core network device, where the first message carries first information, and the first information relates to the small data transmission settings of a terminal device.

[0372] In some embodiments, the first message is a control plane message, and the access network device sends the control plane message to the core network device.

[0373] In some embodiments, the first message is a user plane message, and the access network device sends the user plane message to the core network device.

[0374] According to embodiments of this disclosure, an access network device transmits first information to a core network device, where the first information relates to the small data transmission settings of a terminal device. Based on the above first information, the core network device can obtain the small data transmission settings of the terminal device, and it is understood that the core network device can perform data transmission with the terminal device based on these settings.

[0375] Figure 4b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 4b, this data transmission method can be used in an access network device and includes the following steps.

[0376] Step S4101b: Send the first message to the core network device.

[0377] Here, the first message carries the first piece of information, which relates to the settings for small data transmission on the terminal device.

[0378] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0379] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0380] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0381] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0382] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0383] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0384] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0385] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0386] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0387] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0388] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0389] In some embodiments, a first message is sent to an access and mobility management function network element.

[0390] In some embodiments, a first message is sent to a session management function network element.

[0391] In some embodiments, a first message is sent to a user plane functional network element.

[0392] According to embodiments of this disclosure, an access network device sends a first message to a core network device to notify the core network device of the access network device's configuration for small data transmission on a terminal device.

[0393] Figure 4c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 4c, this data transmission method can be used in an access network device and includes the following steps.

[0394] Step S4101c: Send a control plane message to the core network device.

[0395] Here, the control plane message carries first information, which relates to the settings for small data transmission of the terminal device.

[0396] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0397] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0398] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0399] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0400] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0401] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0402] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0403] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0404] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0405] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0406] In some embodiments, control plane messages are next-generation application protocol messages.

[0407] According to embodiments of this disclosure, the access network device sends a control plane message to the core network device to notify the core network device of the access network device's configuration for small data transmission on terminal devices.

[0408] Figure 4d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 4d, this data transmission method can be used in an access network device and includes the following steps.

[0409] Step S4101d: Send a user plane message to the core network device.

[0410] Here, the user plane message carries first information, which relates to the settings for small data transmission on the terminal device.

[0411] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device. In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0412] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0413] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0414] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0415] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0416] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0417] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0418] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0419] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0420] In some embodiments, the user plane message is a generic packet radio service tunnel protocol message of the user plane, and exemplary, the header of the generic packet radio service tunnel protocol message of the user plane carries first information.

[0421] According to embodiments of this disclosure, the access network device sends a user plane message to the core network device to notify the core network device of the access network device's configuration for small data transmission on the terminal device.

[0422] Figure 4e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 4e, this data transmission method can be used in an access network device and includes the following steps.

[0423] Step S4101e: Send an inactive state transition report message for the terminal device to the core network device.

[0424] Here, the inactive state transition report message carries a first piece of information, which relates to the small data transmission settings of the terminal device.

[0425] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0426] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0427] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0428] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0429] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0430] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0431] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0432] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0433] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0434] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0435] In some embodiments, an inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0436] According to embodiments of this disclosure, an access network device sends an inactive state transition report message to a core network device to notify the core network device of the access network device's settings for small data transmission of terminal devices. It is understood that this allows the core network device to perform data transmission with terminal devices that are in an inactive state based on these settings.

[0437] Figure 4f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 4f, this data transmission method can be used in an access network device and includes the following steps.

[0438] Step S410f: Send the first piece of information to the core network device.

[0439] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0440] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0441] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0442] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0443] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0444] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0445] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0446] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0447] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0448] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0449] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0450] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0451] In some embodiments, the first information is transmitted to an access and mobility management function network element.

[0452] In some embodiments, the first information is transmitted to a session management function network element.

[0453] In some embodiments, first information is transmitted to a user plane functional network element.

[0454] In some embodiments, a first message is sent to a core network device, where the first message carries first information, and the first information relates to the small data transmission settings of a terminal device.

[0455] In some embodiments, the first message is a control plane message, and the access network device sends the control plane message to the core network device.

[0456] In some embodiments, the first message is a user plane message, and the access network device sends the user plane message to the core network device.

[0457] Step S420f: The core network device receives downlink information corresponding to small data transmission, which was transmitted based on the first information.

[0458] Here, the core network device receives downlink information corresponding to the small data transmission configured on the terminal device, which was transmitted based on the first information.

[0459] According to embodiments of this disclosure, an access network device transmits first information to a core network device, which then determines, based on the first information, whether or not to transmit buffered downlink information, and also transmits downlink information corresponding to small data transmission to the access network device, where the first information relates to the small data transmission settings of a terminal device. Based on the first information, the core network device can obtain the small data transmission settings of the terminal device and determine whether or not to transmit buffered downlink information to the terminal device, and the specific content of the downlink information to be transmitted. This enables small data transmission by the terminal device, ensures the arrival of downlink information, reduces memory overhead of the core network, reduces the need for the core network to page terminals into a connected state due to insufficient memory, and also reduces signaling overhead and device power consumption.

[0460] Figure 4g is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 4g, this data transmission method can be used in an access network device and includes the following steps.

[0461] Step S410g: Send the first piece of information to the core network device.

[0462] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0463] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0464] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0465] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0466] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0467] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0468] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0469] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0470] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0471] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0472] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0473] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0474] In some embodiments, the first information is transmitted to an access and mobility management function network element.

[0475] In some embodiments, the first information is transmitted to a session management function network element.

[0476] In some embodiments, first information is transmitted to a user plane functional network element.

[0477] In some embodiments, a first message is sent to a core network device, where the first message carries first information, and the first information relates to the small data transmission settings of a terminal device.

[0478] In some embodiments, the first message is a control plane message, and the access network device sends the control plane message to the core network device.

[0479] In some embodiments, the first message is a user plane message, and the access network device sends the user plane message to the core network device.

[0480] Step S420g: The core network device receives downlink information corresponding to small data transmission, which was transmitted based on the first information.

[0481] Here, the core network device receives downlink information corresponding to the small data transmission configured on the terminal device, which was transmitted based on the first information.

[0482] Step S430g: The downlink information transmitted by the core network device is sent to the terminal device via small data transmission.

[0483] Here, the downlink information corresponding to the small data transmission configured on the terminal device, which was transmitted by the core network device, is sent to the terminal device via small data transmission.

[0484] According to embodiments of this disclosure, an access network device transmits first information to a core network device, which, based on the first information, determines whether or not to transmit buffered downlink information, and also transmits downlink information corresponding to small data transmission to the access network device based on the first information, where the first information relates to the small data transmission settings of a terminal device. Based on the first information, the core network device can obtain the small data transmission settings of the terminal device and determine whether or not to transmit buffered downlink information to the terminal device, and the specific content of the downlink information to be transmitted. After receiving the downlink information, the access network device transmits it to the terminal device, thereby performing small data transmission on the terminal device, ensuring the arrival of the downlink information, reducing the memory overhead of the core network, reducing the need for the core network to page terminals into a connected state due to insufficient memory, and also reducing signaling overhead and device power consumption.

[0485] Figure 5a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5a, this data transmission method can be used in an access network device and includes the following steps.

[0486] Step S510a: Receive the second piece of information sent by the core network device.

[0487] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0488] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0489] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0490] In some embodiments, the access and mobility management function network element receives second information transmitted by the network element.

[0491] In some embodiments, a second piece of information is received that has been transmitted by a session management function network element.

[0492] In some embodiments, a second piece of information transmitted by a user plane functional network element is received.

[0493] In some embodiments, a second message is received that has been transmitted by a core network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0494] In some embodiments, the second message is a control plane message, and the access network device receives the control plane message sent by the core network device.

[0495] In some embodiments, the second message is a user plane message, and the access network device receives the user plane message sent by the core network device.

[0496] According to embodiments of this disclosure, an access network device receives second information transmitted by a core network device, where the second information relates to incoming communications of a core network-based mobile station. Based on the second information, the access network device can obtain the core network-side status regarding incoming communications of a core network-based mobile station. This allows the access network device to consider the core network-side status regarding incoming communications of a core network-based mobile station when transmitting data from a terminal device.

[0497] Figure 5b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5b, this data transmission method can be used in an access network device and includes the following steps.

[0498] Step S510b: Receive the second piece of information sent by the core network device.

[0499] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0500] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0501] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0502] In some embodiments, the access and mobility management function network element receives second information transmitted by the network element.

[0503] In some embodiments, a second piece of information is received that has been transmitted by a session management function network element.

[0504] In some embodiments, a second piece of information transmitted by a user plane functional network element is received.

[0505] In some embodiments, a second message is received that has been transmitted by a core network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0506] In some embodiments, the second message is a control plane message, and the access network device receives the control plane message sent by the core network device.

[0507] In some embodiments, the second message is a user plane message, and the access network device receives the user plane message sent by the core network device.

[0508] Step S520b: Based on the second piece of information, decide whether or not to send the third piece of information to the core network device.

[0509] Here, the third piece of information is used to notify the core network device that the terminal device is able to receive downlink information, which includes buffered signaling and / or data for the core network device to perform incoming communications for the core network-based mobile station.

[0510] In some embodiments, the decision to send third information to the core network device based on second information is made if at least one of the following conditions is met: downlink information is buffered in the core network device; the information in the downlink information belongs to a small data transmission type corresponding to small data transmission configured in the terminal device; the buffering time represented by the time information corresponding to the downlink information is less than or equal to the extended intermittent reception period represented by the extended intermittent reception period parameter configured in the terminal device; the data size of the information belonging to the small data transmission type in the downlink information is less than or equal to the data threshold corresponding to small data transmission configured in the terminal device; the third protocol data unit session identifier of the information belonging to the small data transmission type in the downlink information matches the first protocol data unit session identifier corresponding to small data transmission configured in the terminal device; and the third quality of service flow identifier of the information belonging to the small data transmission type in the downlink information matches the first quality of service flow identifier corresponding to small data transmission configured in the terminal device.

[0511] In some embodiments, based on the second instruction information, it is determined whether downlink information is being buffered in the core network device.

[0512] In some embodiments, based on a second information type, it is determined that the information in the downlink information belongs to a small data transmission type corresponding to the small data transmission configured on the terminal device.

[0513] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0514] According to embodiments of the present disclosure, an access network device receives second information transmitted by a core network device and, based on the second information, decides whether or not to transmit third information to the core network device, where the second information relates to incoming communications of a core network-based mobile station and the third information is used to notify the core network device that a terminal device can receive downlink information. Based on the second information, the access network device can obtain the status on the core network side regarding incoming communications of a core network-based mobile station, and when transmitting data from a terminal device, the access network device can consider the status on the core network side regarding incoming communications of a core network-based mobile station and decide whether or not to transmit third information to notify the core network device that a terminal device can receive downlink information.

[0515] Figure 5c is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5c, this data transmission method can be used in an access network device and includes the following steps.

[0516] Step S5101c: Receive the second message sent by the core network device.

[0517] Here, the second message carries the second piece of information, which relates to incoming communications from a core network-based mobile station.

[0518] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0519] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0520] In some embodiments, a second message is received that has been transmitted by an access and mobility management function network element.

[0521] In some embodiments, a second message sent by a session management function network element is received.

[0522] In some embodiments, a second message is received that was sent by a user plane functional network element.

[0523] According to embodiments of the present disclosure, an access network device receives a second message transmitted by a core network device to obtain the core network-side status regarding incoming communications of a core network-based mobile station.

[0524] Figure 5d is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5d, this data transmission method can be used in an access network device and includes the following steps.

[0525] Step S5101d: Receive control plane messages sent by the core network device.

[0526] Here, the control plane message carries a second piece of information, which relates to incoming communications from a core network-based mobile station.

[0527] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0528] In some embodiments, control plane messages are next-generation application protocol messages.

[0529] According to embodiments of the present disclosure, an access network device receives control plane messages transmitted by a core network device to obtain the core network-side status regarding incoming communications of a core network-based mobile station.

[0530] Figure 5e is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5e, this data transmission method can be used in an access network device and includes the following steps.

[0531] Step S5101e: Receive user plane messages sent by the core network device.

[0532] Here, the user plane message carries second information, which relates to incoming communications from a core network-based mobile station.

[0533] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0534] In some embodiments, the user plane message is a generic packet radio service tunnel protocol message of the user plane, and exemplary, the header of the generic packet radio service tunnel protocol message of the user plane carries second information.

[0535] According to embodiments of the present disclosure, an access network device receives user plane messages transmitted by a core network device and obtains the core network-side status regarding incoming communications of a core network-based mobile station.

[0536] Figure 5f is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5f, this data transmission method can be used in an access network device and includes the following steps.

[0537] Step S510f: Receive the second piece of information sent by the core network device.

[0538] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0539] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0540] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0541] In some embodiments, the access and mobility management function network element receives second information transmitted by the network element.

[0542] In some embodiments, a second piece of information is received that has been transmitted by a session management function network element.

[0543] In some embodiments, a second piece of information transmitted by a user plane functional network element is received.

[0544] In some embodiments, a second message is received that has been transmitted by a core network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0545] In some embodiments, the second message is a control plane message, and the access network device receives the control plane message sent by the core network device.

[0546] In some embodiments, the second message is a user plane message, and the access network device receives the user plane message sent by the core network device.

[0547] Step S520f: Based on the second piece of information, a decision is made as to whether or not to send the third piece of information to the core network device.

[0548] Here, the third piece of information is used to notify the core network device that the terminal device is able to receive downlink information, which includes buffered signaling and / or data for the core network device to perform incoming communications for the core network-based mobile station.

[0549] Selective embodiments of step S520f are described in the selective embodiment of step S520b in Figure 5b and in other relevant parts of the embodiment relating to Figure 5b, and will not be described further here.

[0550] Step S530f: Decide to send third information to the core network device and generate third information based on the second information.

[0551] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0552] Step S540f: Send third information to the core network device.

[0553] According to embodiments of the present disclosure, an access network device receives second information transmitted by a core network device and, based on the second information, decides whether or not to transmit third information to the core network device, where the second information relates to incoming communications of a core network-based mobile station and the third information is used to notify the core network device that a terminal device can receive downlink information. Based on the second information, the access network device can obtain the status on the core network side regarding incoming communications of a core network-based mobile station, and when the access network device performs data transmission of the terminal device, it can consider the status on the core network side regarding incoming communications of a core network-based mobile station and transmit third information to notify the core network device that the terminal device can receive downlink information, thereby allowing the core network device to consider the terminal device's ability to receive downlink information when performing data transmission of the terminal device.

[0554] Figure 5g is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5g, this data transmission method can be used in an access network device and includes the following steps.

[0555] Step S510g: Receive the second piece of information sent by the core network device.

[0556] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0557] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0558] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0559] In some embodiments, the access and mobility management function network element receives second information transmitted by the network element.

[0560] In some embodiments, a second piece of information is received that has been transmitted by a session management function network element.

[0561] In some embodiments, a second piece of information transmitted by a user plane functional network element is received.

[0562] In some embodiments, a second message is received that has been transmitted by a core network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0563] In some embodiments, the second message is a control plane message, and the access network device receives the control plane message sent by the core network device.

[0564] In some embodiments, the second message is a user plane message, and the access network device receives the user plane message sent by the core network device.

[0565] Step S520g: Based on the second piece of information, decide whether or not to send the third piece of information to the core network device.

[0566] Here, the third piece of information is used to notify the core network device that the terminal device is able to receive downlink information, which includes buffered signaling and / or data for the core network device to perform incoming communications for the core network-based mobile station.

[0567] Selective embodiments of step S520g are described in the selective embodiment of step S520b in Figure 5b and in other relevant parts of the embodiment relating to Figure 5b, and will not be described further here.

[0568] Step S530g: Decide to send third information to the core network device and generate third information based on the second information.

[0569] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0570] Step S540g: Send third information to the core network device.

[0571] Step S550g: The core network device receives downlink information corresponding to small data transmission, which has been transmitted based on the third piece of information.

[0572] Here, the core network device receives downlink information corresponding to the small data transmission configured on the terminal device, which was transmitted based on the third piece of information.

[0573] According to embodiments of the present disclosure, an access network device receives second information transmitted by a core network device and, based on the second information, decides whether or not to transmit third information to the core network device, where the second information relates to incoming communications of a core network-based mobile station, and the third information is used to notify the core network device that a terminal device can receive downlink information. Based on the second information, the access network device can obtain the status on the core network side regarding incoming communications of a core network-based mobile station, and when the access network device performs data transmission of a terminal device, it considers the status on the core network side regarding incoming communications of a core network-based mobile station and transmits third information to notify the core network device that the terminal device can receive downlink information, thereby enabling the core network device to transmit downlink information corresponding to small data transmission when performing data transmission of a terminal device, taking into account the terminal device's ability to receive downlink information.

[0574] Figure 5h is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 5h, this data transmission method can be used in an access network device and includes the following steps.

[0575] Step S510h: Receive the second piece of information sent by the core network device.

[0576] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0577] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0578] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0579] In some embodiments, the access and mobility management function network element receives second information transmitted by the network element.

[0580] In some embodiments, a second piece of information is received that has been transmitted by a session management function network element.

[0581] In some embodiments, a second piece of information transmitted by a user plane functional network element is received.

[0582] In some embodiments, a second message is received that has been transmitted by a core network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0583] In some embodiments, the second message is a control plane message, and the access network device receives the control plane message sent by the core network device.

[0584] In some embodiments, the second message is a user plane message, and the access network device receives the user plane message sent by the core network device.

[0585] Step S520h: Based on the second piece of information, decide whether or not to send the third piece of information to the core network device.

[0586] Here, the third piece of information is used to notify the core network device that the terminal device is able to receive downlink information, which includes buffered signaling and / or data for the core network device to perform incoming communications for the core network-based mobile station.

[0587] Selective embodiments of step S520h are described in the selective embodiment of step S520b in Figure 5b and in other relevant parts of the embodiment relating to Figure 5b, and will not be described further here.

[0588] Step S530h: Decide to send third information to the core network device and generate third information based on the second information.

[0589] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0590] Step S540h: Send third information to the core network device.

[0591] Step S550h: The core network device receives downlink information corresponding to small data transmission, which has been transmitted based on the third piece of information.

[0592] Here, the core network device receives downlink information corresponding to the small data transmission configured on the terminal device, which was transmitted based on the third piece of information.

[0593] Step S560h: The downlink information transmitted by the core network device is sent to the terminal device via small data transmission.

[0594] Here, the downlink information corresponding to the small data transmission configured on the terminal device, which was transmitted by the core network device, is sent to the terminal device via small data transmission.

[0595] According to embodiments of this disclosure, an access network device receives second information transmitted by a core network device and, based on the second information, decides whether or not to transmit third information to the core network device, where the second information relates to incoming communications of a core network-based mobile station, and the third information is used to notify the core network device that a terminal device can receive downlink information. Based on the second information, the access network device can obtain the status on the core network side regarding incoming communications of a core network-based mobile station, and when transmitting data from a terminal device, the access network device can transmit third information to notify the core network device that the terminal device can receive downlink information, taking into account the status on the core network side regarding incoming communications of a core network-based mobile station. As a result, when transmitting data from a terminal device, the core network device can transmit downlink information corresponding to small data transmission, taking into account the terminal device's ability to receive downlink information, and the access network device can perform small data transmission on the terminal device by transmitting the downlink information transmitted by the core network device to the terminal device via small data transmission, thereby ensuring the arrival of downlink information and reducing the power consumption of the terminal device.

[0596] Figure 6a is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 6a, this data transmission method can be used in the communication system shown in Figure 1a, and the method includes the following steps.

[0597] Step S610a: The access network device sends first information to the core network device.

[0598] Here, the first piece of information relates to the configuration of small data transmission by the access network device for terminal devices.

[0599] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0600] In some embodiments, the first information type indicates the type of information that can be transmitted by small data transmission configured on the terminal device.

[0601] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, signaling, data, or signaling and data.

[0602] In some embodiments, the first information type indicates the information transmission direction supported by the small data transmission configured on the terminal device.

[0603] In some embodiments, the first information type corresponding to small data transmission configured on the terminal device includes, but is not limited to, uplink, downlink, or uplink and downlink.

[0604] In some embodiments, threshold information indicates the data size of information that can be transmitted by small data transmission configured on the terminal device.

[0605] In some embodiments, threshold information indicates the amount of data that can be transmitted by small data transmission configured on the terminal device.

[0606] In some embodiments, the first protocol data unit session identifier indicates a protocol data unit session that supports small data transmission and is configured on the terminal device.

[0607] In some embodiments, the first quality-of-service flow identifier indicates a quality-of-service flow that supports small data transmission configured on the terminal device.

[0608] In some embodiments, the first information includes MT-SDT and / or MO-SDT configuration information of the terminal device.

[0609] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0610] In some embodiments, first information is transmitted to access network device access and mobility management function network elements.

[0611] In some embodiments, first information is transmitted to the access network device session management function network element.

[0612] In some embodiments, first information is transmitted to an access network device user plane functional network element.

[0613] In some embodiments, an access network device sends a first message to a core network device, where the first message carries first information, and the first information relates to the settings for small data transmission on a terminal device.

[0614] In some embodiments, the first message is a control plane message, and the access network device sends the control plane message to the core network device.

[0615] In some embodiments, the first message is a user plane message, and the access network device sends the user plane message to the core network device.

[0616] In some embodiments, the first message is an inactive state transition report message, and the access network device sends the terminal device inactive state transition report message to the core network device.

[0617] In some embodiments, an inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0618] In some embodiments, a core network device configures incoming communications for core network-based mobile stations.

[0619] In some embodiments, if a terminal device supports small data transmission, the terminal device may receive downlink information corresponding to small data transmission while inactive. On the core network device side, when downlink information arrives, if the terminal device is inactive, specifically if the configured extended intermittent receive cycle is greater than or equal to 10.24 seconds and the terminal device is inactive, the core network device does not send the downlink information to the access network device for transmission to the terminal device. Instead, it assesses the reachability of the terminal device, performs incoming communication for the core network-based mobile station, and then sends the downlink information to this terminal device in a connected state, and small data transmission to the terminal device is not performed.

[0620] Step S620a: The core network device decides whether or not to transmit the buffered downlink information based on the first information.

[0621] Here, downlink information includes buffered signaling and / or data for executing incoming communications for core network-based mobile stations.

[0622] A selective embodiment of step S620a is described in the selective embodiment of step S220b in Figure 2b and in other relevant parts of the embodiment relating to Figure 2b, and will not be described further here.

[0623] If the core network device decides to transmit buffered downlink information based on the first information, step S630a is performed.

[0624] Step S630a: Based on the first information, the core network device transmits downlink information corresponding to small data transmission to the access network device.

[0625] Step S640a: The access network device transmits the downlink information transmitted by the core network device to the terminal device via small data transmission.

[0626] According to embodiments of this disclosure, an access network device transmits first information to a core network device, the first information relating to the access network device's settings for small data transmission of a terminal device; the core network device determines, based on the first information, whether or not to transmit buffered downlink information; the core network device transmits downlink information corresponding to small data transmission to the access network device based on the first information; and the access network device transmits the downlink information transmitted by the core network device to the terminal device via small data transmission. This allows the core network device to obtain the terminal device's settings for small data transmission and avoid collisions between small data transmission and incoming communications of a core network-based mobile station.

[0627] Figure 6b is a flowchart of yet another data transmission method according to an embodiment of the present disclosure. As shown in Figure 6b, this data transmission method can be used in the communication system shown in Figure 1a, and the method includes the following steps.

[0628] Step S610b: The core network device sends second information to the access network device.

[0629] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0630] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0631] In some embodiments, the core network device includes network elements for access and mobility management functions, network elements for session management functions, and network elements for user plane functions, etc.

[0632] In some embodiments, an access and mobility management function network element transmits second information to an access network device.

[0633] In some embodiments, a session management network element transmits second information to an access network device.

[0634] In some embodiments, a user plane functional network element transmits second information to an access network device.

[0635] In some embodiments, a core network device sends a second message to an access network device, where the second message carries second information relating to incoming communications of a core network-based mobile station.

[0636] In some embodiments, the second message is a control plane message, and the core network device sends the control plane message to the access network device.

[0637] In some embodiments, the second message is a user plane message, and the core network device sends the user plane message to the access network device.

[0638] Step S620b: The access network device decides whether or not to send the third information to the core network device based on the second information.

[0639] Here, the third piece of information is used to notify the core network device that the terminal device is able to receive downlink information, which includes buffered signaling and / or data for the core network device to perform incoming communications for the core network-based mobile station.

[0640] A selective embodiment of step S620b is described in the selective embodiment of step S520b in Figure 5b and in other relevant parts of the embodiment relating to Figure 5b, and will not be described further here.

[0641] If the access network device decides to send the third information to the core network device based on the second information, then step S630b is performed.

[0642] Step S630b: The access network device transmits third information to the core network device.

[0643] The third information may include at least one of the following: third instruction information for notifying the core network device that the terminal device can receive downlink information; third information type corresponding to the downlink information that the terminal device can receive; fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0644] Step S640b: The core network device decides, based on the third piece of information, whether to transmit downlink information corresponding to small data transmission.

[0645] If the core network device decides, based on the third piece of information, to transmit downlink information corresponding to small data transmission, then step S650b is executed.

[0646] Step S650b: Based on the third piece of information, the core network device transmits downlink information corresponding to small data transmission to the access network device.

[0647] Step S660b: The access network device transmits the downlink information transmitted by the core network device to the terminal device via small data transmission.

[0648] According to embodiments of the present disclosure, a core network device transmits a second piece of information to an access network device, the second piece of information relating to incoming communications of a core network-based mobile station; the access network device decides whether to transmit a third piece of information to the core network device based on the second piece of information, the third piece of information used to notify the core network device that a terminal device can receive downlink information; the access network device transmits the third piece of information to the core network device, the core network device decides whether to transmit downlink information corresponding to small data transmission based on the third piece of information; the core network device transmits downlink information corresponding to small data transmission to the access network device based on the third piece of information; and the access network device transmits the downlink information transmitted by the core network device to the terminal device via small data transmission. This allows the access network device to obtain the status of incoming communications of a core network-based mobile station and decide whether to notify the core network of the terminal device's receivability; the core network device can obtain the terminal device's small data transmission settings and decide whether to transmit downlink information to avoid conflicts between small data transmission and incoming communications of a core network-based mobile station.

[0649] The following is another data transmission method shown in the embodiments of this disclosure, which includes the following steps:

[0650] 1. The base station transmits first information to a first network element via a first message. The first message may be any one of a control plane message, a user plane message, or an inactive state transition report message. The control plane message may be a next-generation application protocol message, and the user plane message may be a user plane general-purpose packet radio service tunnel protocol message, the header of which carries the first information. The first information includes at least one of the following: first instruction information indicating whether small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device. The first network element is any one of an access and mobility management function network element, a session management function network element, or a user plane function network element.

[0651] 2. The first network element decides whether or not to transmit buffered downlink information based on the first information. The first network element transmits buffered downlink information if it determines that at least one of the following conditions is met: small data transmission is configured on the terminal device; the information type of the downlink information is signaling or data corresponding to the first information type; the extended intermittent reception period, represented by the extended intermittent reception period parameter configured on the terminal device, is greater than or equal to a preset period; the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information; the second protocol data unit session identifier corresponding to the information belonging to the first information type in the downlink information matches the first protocol data unit session identifier; and the second quality of service flow identifier corresponding to the information belonging to the first information type in the downlink information matches the first quality of service flow identifier.

[0652] 3. The first network element decides to transmit buffered downlink information, and based on the first information, the first network element transmits downlink information corresponding to small data transmission to the base station.

[0653] 4. The base station transmits the downlink information transmitted by the first network element to the terminal device via small data transmission.

[0654] The following is another data transmission method shown in the embodiments of this disclosure, which includes the following steps:

[0655] 1. The first network element transmits second information to the base station via a second message. The second message may be a control plane message or a user plane message. The control plane message may be a next-generation application protocol message, and the user plane message may be a user plane general-purpose packet radio service tunnel protocol message, the header of which carries the second information. The second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to the buffered downlink information; time information corresponding to the buffered downlink information; data size corresponding to the buffered downlink information; third protocol data unit session identifier corresponding to the buffered downlink information; and third quality of service flow identifier corresponding to the buffered downlink information. The first network element is one of an access and mobility management function network element, a session management function network element, and a user plane function network element.

[0656] 2. Based on the second information, the base station decides whether or not to transmit the third information to the first network element. Here, the third information is used to notify the first network element that a terminal device can receive downlink information. The downlink information includes buffered signaling and / or data for the first network element to perform incoming communication of a core network-based mobile station.

[0657] 3. The base station decides to transmit third information and transmits the third information to the core network device. The third information may include at least one of the following: third instruction information to notify the core network device that the terminal device can receive downlink information; third information type corresponding to the downlink information that the terminal device can receive; fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0658] 4. The first network element decides whether or not to transmit downlink information corresponding to small data transmission based on the third information.

[0659] 5. The first network element decides to transmit buffered downlink information, and based on the third information, the first network element transmits downlink information corresponding to small data transmission to the base station.

[0660] 6. The base station transmits the downlink information transmitted by the first network element to the terminal device via small data transmission.

[0661] It should be noted that if some of the multiple embodiments or features separated by "or" cannot be implemented, this will not affect the other solutions. Furthermore, unless there is a contradiction, the embodiments of this disclosure can be combined with other embodiments or representations of data transmission methods and various arbitrary solutions thereof, but these are not described herein.

[0662] Figure 7a is a block diagram of a data transmission device 1000 according to an embodiment of the present disclosure. As shown in Figure 7a, this data transmission device 1000 can be used in a core network device.

[0663] The device 1000 may include a first receiving module 1010 configured to receive first information transmitted by an access network device.

[0664] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0665] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0666] In some embodiments, the first receiving module 1010 is configured to receive a first message transmitted by an access network device, where the first message carries first information.

[0667] In some embodiments, the first receiving module 1010 is configured to receive control plane messages transmitted by an access network device.

[0668] In some embodiments, the first receiving module 1010 is configured to receive user plane messages transmitted by an access network device.

[0669] In some embodiments, the first receiving module 1010 is configured to receive an inactive state transition report message from an access network device to a terminal device. In some embodiments, the inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0670] In some embodiments, the device 1000 may further include a first decision module configured to determine whether or not to transmit buffered downlink information based on the first information.

[0671] Here, downlink information includes buffered signaling and / or data for executing incoming communications for core network-based mobile stations.

[0672] In some embodiments, the first decision module is configured to transmit downlink information corresponding to small data transmission if it determines, based on the first instruction information, that small data transmission is configured on the terminal device.

[0673] In some embodiments, the first decision module is configured to transmit downlink information corresponding to small data transmission if the information in the downlink information belongs to a first information type.

[0674] In some embodiments, the first decision module is configured to transmit downlink information corresponding to small data transmissions if the extended intermittent reception period, represented by the extended intermittent reception period parameter, is greater than or equal to a preset period.

[0675] In some embodiments, the first decision module is configured to transmit downlink information corresponding to small data transmission if the data size of the information belonging to a first information type in the downlink information is less than or equal to a data threshold represented by threshold information.

[0676] In some embodiments, the first decision module is configured to transmit downlink information corresponding to small data transmissions if a second protocol data unit session identifier corresponding to information belonging to a first information type in the downlink information matches the first protocol data unit session identifier, and / or, a second quality of service flow identifier corresponding to information belonging to a first information type in the downlink information matches the first quality of service flow identifier.

[0677] In some embodiments, the device 1000 may further include a first transmission module configured to transmit downlink information corresponding to small data transmission to an access network device based on the first information.

[0678] Figure 7b is a block diagram of another data transmission device 1100 according to an embodiment of the present disclosure. As shown in Figure 7b, this data transmission device 1100 can be used in a core network device.

[0679] The device 1100 may include a first transmitting module 1110 configured to transmit second information to an access network device.

[0680] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0681] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to buffered downlink information; time information corresponding to buffered downlink information; data size corresponding to buffered downlink information; third protocol data unit session identifier corresponding to buffered downlink information; and third quality of service flow identifier corresponding to buffered downlink information.

[0682] In some embodiments, the first transmission module 1110 is configured to send a second message to an access network device, where the second message carries second information.

[0683] In some embodiments, the first transmitting module 1110 is configured to send control plane messages to an access network device.

[0684] In some embodiments, the first transmission module 1110 is configured to send user plane messages to an access network device.

[0685] In some embodiments, the device 1100 may further include a third receiving module configured to receive third information transmitted by an access network device.

[0686] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0687] In some embodiments, the device 1100 is further configured to determine whether or not to transmit downlink information corresponding to small data transmission based on third information. decision It can include modules.

[0688] In some embodiments, the device 1100 may further include a second transmission module configured to transmit downlink information corresponding to small data transmission to an access network device based on third information.

[0689] Figure 8a is a block diagram of yet another data transmission device 2000 according to an embodiment of the present disclosure. As shown in Figure 8a, this data transmission device 2000 can be used in an access network device.

[0690] The device 2000 may include a second transmitting module 2010 configured to transmit first information to a core network device.

[0691] Here, the first piece of information relates to the settings for small data transmission on the terminal device.

[0692] In some embodiments, the first information includes at least one of the following: first instruction information indicating whether or not small data transmission is configured on the terminal device; first information type corresponding to small data transmission configured on the terminal device; extended intermittent reception period parameter configured on the terminal device; threshold information corresponding to small data transmission configured on the terminal device; first protocol data unit session identifier corresponding to small data transmission configured on the terminal device; and first quality of service flow identifier corresponding to small data transmission configured on the terminal device.

[0693] In some embodiments, the second transmitting module 2010 is configured to send a first message to a core network device, where the first message carries first information.

[0694] In some embodiments, the second transmitting module 2010 is configured to send control plane messages to the core network device.

[0695] In some embodiments, the second transmitting module 2010 is configured to send user plane messages to the core network device.

[0696] In some embodiments, the second transmission module 2010 is configured to send an inactive state transition report message for the terminal device to the core network device.

[0697] In some embodiments, an inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state.

[0698] In some embodiments, the device 2000 may further include a fourth receiving module configured to receive downlink information corresponding to small data transmissions transmitted by the core network device based on the first information.

[0699] In some embodiments, the device 2000 may further include a third transmission module configured to transmit downlink information transmitted by the core network device to terminal devices via small data transmission.

[0700] Figure 8b is a block diagram of yet another data transmission device 2100 according to an embodiment of the present disclosure. As shown in Figure 8b, this data transmission device 2100 can be used in an access network device.

[0701] The device 2100 may include a second receiving module 2110 configured to receive second information transmitted by a core network device.

[0702] Here, the second piece of information relates to incoming communications of core network-based mobile stations.

[0703] In some embodiments, the second information includes at least one of the following: second instruction information indicating the start of buffering; second information type corresponding to the buffered downlink information; time information corresponding to the buffered downlink information; data size corresponding to the buffered downlink information; third protocol data unit session identifier corresponding to the buffered downlink information; and third quality of service flow identifier corresponding to the buffered downlink information.

[0704] In some embodiments, the second receiving module 2110 is configured to receive a second message transmitted by the core network device, where the second message carries second information.

[0705] In some embodiments, the second receiving module 2110 is configured to receive control plane messages transmitted by the core network device.

[0706] In some embodiments, the second receiving module 2110 is configured to receive user plane messages transmitted by the core network device.

[0707] In some embodiments, the device 2100 is further configured to determine whether or not to transmit third information to a core network device based on second information. decision It can include modules.

[0708] Here, the third piece of information is used to notify the core network device that the terminal device is able to receive downlink information, which includes buffered signaling and / or data for the core network device to perform incoming communications for the core network-based mobile station.

[0709] In some embodiments, the apparatus 2100 may further include a first generation module configured to generate a third piece of information based on a second piece of information.

[0710] In some embodiments, the third information includes at least one of the following: third instruction information for notifying a core network device that a terminal device can receive downlink information; a third information type corresponding to the downlink information that the terminal device can receive; a fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive; and a fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive.

[0711] In some embodiments, the device 2100 may further include a fourth transmitting module configured to transmit third information to a core network device.

[0712] In some embodiments, the device 2100 may further include a fifth receiving module configured to receive downlink information corresponding to small data transmissions transmitted by the core network device based on the third information.

[0713] In some embodiments, the device 2100 may further include a fifth transmitting module configured to transmit downlink information transmitted by the core network device to terminal devices via small data transmission.

[0714] It should be noted that the division of the various units in the above-described device is merely a division of logical functions. In actual implementations, these units may be fully or partially integrated into a single physical entity, or they may be physically separated. Furthermore, the units within the device may be implemented in the form of processors that invoke software. For example, the device may include a processor connected to memory that stores computer instructions, and the processor invokes the computer instructions stored in memory to execute one of the above methods or the functions of the various units within the device. The processor may be a general-purpose processor such as a Central Processing Unit (CPU) or a microprocessor, and the memory may be located inside or outside the device. Alternatively, the units within the device may be implemented as hardware circuits, and some or all of the functions of the units may be realized through the design of the hardware circuits. The above-described hardware circuits may be understood as one or more processors. For example, in one embodiment, the above-described hardware circuit is an application-specific integrated circuit (ASIC), and some or all of the functions of the units may be realized through the design of logical relationships between components within the circuit. In another embodiment, the hardware circuit may be implemented using a programmable logic device (PLD), such as a field programmable gate array (FPGA), which can include a large number of logic gate circuits. The connections between the logic gate circuits are configured using a configuration file to implement some or all of the functions of the unit. All units of the device may be fully implemented by a processor calling software, fully implemented by hardware circuitry, or partially implemented by a processor calling software and the remainder implemented by hardware circuitry.

[0715] In embodiments of this disclosure, the processor is a circuit with signal processing capabilities. In one embodiment, the processor is a circuit capable of reading and executing instructions, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a type of microprocessor), or a digital signal processor (DSP). In another embodiment, the processor can realize specific functions through the logic relationships of hardware circuits. The hardware circuits may have fixed or reconfigurable logic relationships. For example, the processor may be a hardware circuit implemented as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD) such as an FPGA. In a reconfigurable hardware circuit, the process by which the processor loads a configuration file and realizes the hardware circuit configuration can be understood as the process by which the processor loads instructions to realize some or all of the functions of the units. Furthermore, hardware circuits designed for artificial intelligence can also be understood as ASICs such as Neural Network Processing Units (NPUs), Tensor Processing Units (TPUs), and Deep Learning Processing Units (DPUs).

[0716] The disclosure also provides a computer-readable storage medium that stores computer program instructions, which, when executed by a processor, perform each step of the data transmission method described herein.

[0717] Figure 9 is a block diagram of a communication device according to an embodiment of the present disclosure, where the communication device is a network device 1700. For example, the network device 1700 may be provided as another network logical entity in a core network or an access network. Referring to Figure 17, the network device 1700 includes a processing component 1722 further comprising one or more processors, and a memory resource represented by memory 1732 for storing instructions such as applications that can be executed by the processing component 1722. The applications stored in memory 1732 may include one or more modules, each corresponding to an instruction set. Furthermore, the processing component 1722 is configured to execute instructions for performing steps of the communication method provided in the method embodiment described above.

[0718] The network device 1700 may further include a power component 1726 configured to manage the power of the device 1700, a wired or wireless network interface 1750 configured to connect the network device 1700 to a network, and an input / output interface 1758. The network device 1700 can operate on an operating system (such as Windows Server®, Mac OS X®, Unix®, Linux®, or FreeBSD®) stored in memory 1732.

[0719] Those skilled in the art will readily conceive of other embodiments of the Disclosure by considering and implementing it. This application is intended to cover all variations, uses, or adaptations of the Disclosure derived from the general principles of the Disclosure, including common or customary art in the art not disclosed herein. The specification and examples are for illustrative purposes only, and the true scope and spirit of the Disclosure are shown by the following claims.

[0720] This disclosure is not limited to the structures shown above and in the accompanying drawings, and it should be understood that various modifications and variations are possible without departing from its scope. The scope of this disclosure is limited only by the attached claims.

Claims

1. A data transmission method performed by a core network device, The steps include receiving first information transmitted by an access network device, or transmitting second information to the access network device. The first piece of information relates to the settings for small data transmission of the terminal device, The second piece of information relates to incoming communications of core network-based mobile stations. A data transmission method characterized by the following features.

2. The above method further, The step includes determining whether or not to transmit buffered downlink information based on the first information, The downlink information includes buffered signaling and / or data for executing incoming communications of the core network-based mobile station. The method according to feature 1.

3. The first information described above is First instruction information indicating whether or not the small data transmission is configured on the terminal device, A first information type corresponding to small data transmission set on the terminal device, The extended intermittent reception period parameter set in the terminal device, Threshold information corresponding to small data transmission set on the aforementioned terminal device, A first protocol data unit session identifier corresponding to small data transmission set on the terminal device, and A first quality of service flow identifier corresponding to small data transmission set on the terminal device, Includes at least one of the following The method according to feature 2.

4. The step of determining whether or not to transmit buffered downlink information based on the first information is: If it is determined that the terminal device is configured for small data transmission based on the first instruction information, the process includes the step of transmitting the downlink information corresponding to the small data transmission. The method according to feature 3.

5. The step of determining whether or not to transmit buffered downlink information based on the first information is: If the information in the downlink information belongs to the first information type, the step includes transmitting the downlink information corresponding to the small data transmission. The method according to feature 3 or 4.

6. The step of determining whether or not to transmit buffered downlink information based on the first information is: If the extended intermittent reception period, represented by the extended intermittent reception period parameter, is greater than or equal to a preset period, the step includes transmitting the downlink information corresponding to the small data transmission. The method according to specification 5.

7. The step of determining whether or not to transmit buffered downlink information based on the first information is: If the data size of the information belonging to the first information type in the downlink information is less than or equal to the data threshold represented by the threshold information, the step includes transmitting the downlink information corresponding to the small data transmission. The method according to 5 or 6, characterized by the features described herein.

8. The step of determining whether or not to transmit buffered downlink information based on the first information is: The process includes the step of transmitting the downlink information corresponding to the small data transmission if a second protocol data unit session identifier corresponding to information belonging to the first information type in the downlink information matches the first protocol data unit session identifier, and / or a second quality of service flow identifier corresponding to information belonging to the first information type in the downlink information matches the first quality of service flow identifier. The method according to any one of claims 5 to 7, characterized by the features described herein.

9. The step of receiving the first information transmitted by the access network device is: The step includes receiving a first message transmitted by the access network device, The first message carries the first information. The method according to any one of claims 1 to 8, characterized by the features described above.

10. The step of receiving the first message transmitted by the access network device is: The step includes receiving a control plane message transmitted by the access network device. The method according to feature 9.

11. The step of receiving the first message transmitted by the access network device is: The step includes receiving user plane messages transmitted by the access network device. The method according to feature 9.

12. The step of receiving the first message transmitted by the access network device is: The step includes receiving an inactive state transition report message from the access network device to the terminal device. The method according to any one of claims 9 to 11, characterized by...

13. The inactive state transition report message is sent by the access network device after the terminal device has transitioned to an inactive state. The method according to 12, characterized by the features described above.

14. The above method further, The process includes the steps of deciding to transmit the buffered downlink information and, based on the first information, transmitting the downlink information corresponding to the small data transmission to the access network device. The method according to any one of claims 2 to 13, characterized by...

15. The second piece of information mentioned above is: Second instruction information that signals the start of buffering, A second information type corresponding to the buffered downlink information, Time information corresponding to the buffered downlink information, The data size corresponding to the buffered downlink information, A third protocol data unit session identifier corresponding to the buffered downlink information, and A third quality of service flow identifier corresponding to the buffered downlink information, Includes at least one of the following The method according to feature 1.

16. The step of transmitting the second information to the access network device is: The step includes sending a second message to the access network device, The second message carries the second information. The method according to 1 or 15, characterized by the features described above.

17. The step of sending a second message to the access network device is: The step includes sending a control plane message to the access network device. The method according to 16, characterized by...

18. The step of sending a second message to the access network device is: The step includes sending a user plane message to the aforementioned access network device. The method according to 16, characterized by...

19. The above method further, The steps include receiving the third information transmitted by the access network device, The process includes the step of determining whether or not to transmit the downlink information corresponding to the small data transmission based on the third information. The method according to any one of claims 1, 15 to 18, characterized by...

20. The third piece of information mentioned above is, A third instruction information for notifying the core network device that the terminal device can receive the downlink information, A third type of information corresponding to the downlink information that the terminal device can receive, A fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive, and A fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive, Includes at least one of the following The method according to feature 19.

21. The above method further, The process includes the step of deciding to transmit the downlink information corresponding to the small data transmission, and transmitting the downlink information corresponding to the small data transmission to the access network device based on the third information. The method according to 19 or 20, characterized by the present invention.

22. A data transmission method performed by an access network device, The process includes the steps of transmitting first information to a core network device, or receiving second information transmitted by the core network device, The first piece of information relates to the settings for small data transmission of the terminal device, The second piece of information relates to incoming communications of core network-based mobile stations. A data transmission method characterized by the following features.

23. The first information described above is First instruction information indicating whether or not the small data transmission is configured on the terminal device, A first information type corresponding to small data transmission set on the terminal device, The extended intermittent reception period parameter set in the terminal device, Threshold information corresponding to small data transmission set on the aforementioned terminal device, A first protocol data unit session identifier corresponding to small data transmission set on the terminal device, and A first quality of service flow identifier corresponding to small data transmission set on the terminal device, Includes at least one of the following The method according to the feature of 22.

24. The step of transmitting the first information to the core network device is: The steps include sending a first message to the core network device, The first message carries the first information. The method according to 22 or 23, characterized by the features described herein.

25. The step of sending a first message to the core network device is: The step includes sending a control plane message to the core network device. The method according to feature 24.

26. The step of sending a first message to the core network device is: The step includes sending a user plane message to the core network device. The method according to feature 24.

27. The step of sending a first message to the core network device is: The step includes sending an inactive state transition report message for the terminal device to the core network device. The method according to any one of claims 24 to 26, characterized by...

28. The step of sending an inactive state transition report message for the terminal device to the core network device is: The step includes transitioning the terminal to an inactive state and sending the inactive state transition report message to the core network device. The method according to feature 27.

29. The above method further, The step includes receiving the downlink information corresponding to the small data transmission transmitted by the core network device based on the first information. The method according to any one of claims 22 to 28, characterized by the features described herein.

30. The above method further, The step includes transmitting the downlink information transmitted by the core network device to the terminal device via small data transmission. The method according to feature 29.

31. The above method further, The process includes the step of determining whether or not to transmit third information to the core network device based on the second information, The third piece of information is used to notify the core network device that the terminal device can receive the downlink information. The downlink information includes buffered signaling and / or data for the core network device to perform incoming communications of the core network-based mobile station. The method according to the feature of 22.

32. The second piece of information mentioned above is: Second instruction information that signals the start of buffering, A second information type corresponding to the buffered downlink information, Time information corresponding to the buffered downlink information, The data size corresponding to the buffered downlink information, A third protocol data unit session identifier corresponding to the buffered downlink information, and A third quality of service flow identifier corresponding to the buffered downlink information, Includes at least one of the following The method according to feature 31.

33. The step of receiving the second information transmitted by the core network device is: The step includes receiving a second message transmitted by the core network device, The second message carries the second information. The method according to any one of claims 22, 31, or 32.

34. The step of receiving the second message transmitted by the core network device is: The step includes receiving a control plane message transmitted by the core network device. The method according to feature 33.

35. The step of receiving the second message transmitted by the core network device is: The step includes receiving user plane messages transmitted by the core network device. The method according to feature 33.

36. The above method further, The step of deciding to transmit the third information to the core network device, The step of transmitting the third information to the core network device includes, The third information is generated based on the second information. The method according to any one of claims 31 to 35, characterized by...

37. The third piece of information mentioned above is, A third instruction information for notifying the core network device that the terminal device can receive the downlink information, A third type of information corresponding to the downlink information that the terminal device can receive, A fourth protocol data unit session identifier corresponding to the downlink information that the terminal device can receive, and A fourth quality of service flow identifier corresponding to the downlink information that the terminal device can receive, Includes at least one of the following The method according to the feature of 36.

38. The above method further, The step includes receiving the downlink information corresponding to the small data transmission transmitted by the core network device based on the third information. The method according to 36 or 37, characterized by the features described above.

39. The above method further, The step includes transmitting the downlink information transmitted by the core network device to the terminal device via small data transmission. The method according to the feature of 38.

40. A data transmission method performed by a communication system including access network devices, core network devices, and terminal devices, The process includes the steps of: the access network device sending a first message to the core network device and the core network device receiving the first information; or the core network device sending a second information to the access network device and the access network device receiving the second information. The first piece of information relates to the settings for small data transmission of the terminal device, The second piece of information relates to incoming communications of core network-based mobile stations. A data transmission method characterized by the following features.

41. A data transmission device, Includes a first receiving module configured to receive first information transmitted by an access network device, or a first transmitting module configured to transmit second information to the access network device, The first piece of information relates to the settings for small data transmission of the terminal device, The second piece of information relates to incoming communications of core network-based mobile stations. A data transmission device characterized by the following features.

42. A data transmission device, The system includes a second transmitting module configured to transmit first information to a core network device, or a second receiving module configured to receive second information transmitted by the core network device. The first piece of information relates to the settings for small data transmission of the terminal device, The second piece of information relates to incoming communications of core network-based mobile stations. A data transmission device characterized by the following features.

43. A communication device, Includes one or more processors, The processor is configured to call computer instructions to cause the communication device to execute the data transmission method described in any one of claims 1 to 39. A communication device characterized by the following features.

44. It is a communication system, Includes access network devices and core network devices, The access network device is configured to perform the data transmission method described in any one of claims 1 to 21, and the core network device is configured to perform the data transmission method described in any one of claims 22 to 39. A communication system characterized by the following features.

45. A computer-readable storage medium that stores computer instructions, When the computer instruction is executed on the communication device, the communication device executes the data transmission method described in any one of claims 1 to 39. A computer-readable storage medium characterized by the following features.

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