Data transmission method, device and equipment

Abstract

The invention provides a data transmission method, device and equipment, and the method comprises the steps: receiving data transmission auxiliary information transmitted by core network equipment; wherein the data transmission auxiliary information comprises at least one of first indication information and data size related information corresponding to a small data transmission SDT bearer, and the first indication information is used for indicating whether the core network equipment caches non-SDT data; determining whether to initiate downlink small data transmission (MT-SDT) paging according to the data transmission auxiliary information; and sending the data cached by the core network equipment to the terminal which is successfully paged. According to the scheme, accurate SDT can be supported, and the problem that in the prior art, SDT cannot be accurately carried out is well solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a data transmission method, device and equipment. Background Art

[0002] At present, for user equipment (UE) that supports enhanced discontinuous reception (eDRX) greater than 10.24s in the Inactive state, the base station can request the core network to buffer the corresponding downlink data; when the core network believes that the UE is reachable, it can send the NR application protocol NGAP (NG Application Protocol, NGAP) DL DATA NOTIFICATION (downlink data notification) message to the next generation radio access network (Next Generation Radio Access Network, NG-RAN), and NG-RAN will trigger Paging (paging) to allow the UE to enter the connected state from the inactive state to receive the data in the core network buffer. However, for the MT-SDT (Mobile Terminated Small Data Transmission, mobile interrupted small data transmission or network-initiated small data transmission or mobile terminal terminated small data transmission or downlink small data transmission) scenario, the inactive UE configured with eDRX can transmit data without entering the connected state. In this scenario, how to transmit small data has not yet been solved.

[0003] From the above, in the prior art, when an inactive UE is configured with an eDRX greater than 10.24s and the base station requests the core network to buffer downlink data, there is a problem that SDT cannot be accurately performed. Summary of the invention

[0004] The purpose of the present application is to provide a data transmission method, device and equipment to solve the problem that SDT cannot be accurately performed in the prior art.

[0005] In order to solve the above technical problems, an embodiment of the present application provides a data transmission method, which is applied to a wireless access network device, including:

[0006] Receive data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to the data size corresponding to the small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0007] Determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information;

[0008] The data cached by the core network device is sent to the terminal that has been successfully paged.

[0009] Optionally, the data size related information includes at least one of the following:

[0010] The data size of each QoS flow mapped to an SDT bearer;

[0011] The total data size of all QoS flows mapped to one SDT bearer;

[0012] Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold;

[0013] The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

[0014] Optionally, the determining whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information includes:

[0015] Determining, according to the data transmission auxiliary information, whether the data cached by the core network device only contains SDT data;

[0016] In the case where it is determined that only SDT data exists, determining to initiate MT-SDT paging;

[0017] If it is determined that only SDT data does not exist, it is determined to initiate non-MT-SDT paging.

[0018] Optionally, determining, according to the data transmission auxiliary information, whether the data cached by the core network device contains only SDT data includes:

[0019] Under the first condition, it is determined that only SDT data exists in the data cached by the core network device;

[0020] The first condition includes at least one of the following:

[0021] The data transmission auxiliary information only carries the data size, and the data size is smaller than the first threshold;

[0022] The data transmission auxiliary information only carries the total data size, and the total data size is smaller than the second threshold;

[0023] The data transmission auxiliary information carries only the second indication information, and the second indication information indicates that the data size of each QoS flow is smaller than the first threshold;

[0024] The data transmission auxiliary information carries only the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

[0025] Optionally, before receiving the data transmission auxiliary information sent by the core network device, the method further includes:

[0026] Sending an acquisition request to the core network device; the acquisition request carries an identifier of a QoS flow mapped to an SDT bearer or a non-SDT bearer;

[0027] The receiving of data transmission auxiliary information sent by the core network device includes:

[0028] The data transmission auxiliary information sent by the core network device according to the acquisition request is received.

[0029] Optionally, the acquisition request further carries: a data threshold and at least one of request information for requesting the core network device to feed back the first information;

[0030] The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer;

[0031] The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

[0032] Optionally, before sending the data cached by the core network device to the terminal that has been successfully paged, the method further includes:

[0033] receiving data cached by the core network device that is directly sent by the core network device after sending the data transmission auxiliary information;

[0034] Alternatively, a data sending request is sent to the core network device; and data cached by the core network device is received and sent by the core network device according to the data sending request.

[0035] The embodiment of the present application also provides a data transmission method, which is applied to a core network device, including:

[0036] Determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0037] The data transmission auxiliary information is sent to a wireless access network device.

[0038] Optionally, the data size related information includes at least one of the following:

[0039] The data size of each QoS flow mapped to an SDT bearer;

[0040] The total data size of all QoS flows mapped to one SDT bearer;

[0041] Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold;

[0042] The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

[0043] Optionally, before determining the data transmission auxiliary information, the method further includes:

[0044] Receiving an acquisition request sent by the wireless access network device; the acquisition request carries an identifier of a QoS flow mapped to an SDT bearer or a non-SDT bearer;

[0045] The determining of data transmission auxiliary information includes:

[0046] According to the acquisition request, data transmission auxiliary information is determined.

[0047] Optionally, the acquisition request further carries: a data threshold and at least one of request information for requesting the core network device to feed back the first information;

[0048] The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer;

[0049] The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

[0050] Optionally, after sending the data transmission auxiliary information to the wireless access network device, the method further includes:

[0051] directly sending the data cached by the core network device to the wireless access network device;

[0052] Alternatively, receiving a data sending request sent by the wireless access network device; and sending the data cached by the core network device to the wireless access network device according to the data sending request.

[0053] The embodiment of the present application further provides a data transmission device, which is a wireless access network device, including a memory, a transceiver, and a processor:

[0054] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0055] Receiving, by the transceiver, data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to a data size corresponding to a small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0056] Determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information;

[0057] The data cached by the core network device is sent to the terminal that has been successfully paged via the transceiver.

[0058] Optionally, the data size related information includes at least one of the following:

[0059] The data size of each QoS flow mapped to an SDT bearer;

[0060] The total data size of all QoS flows mapped to one SDT bearer;

[0061] Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold;

[0062] The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

[0063] Optionally, the determining whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information includes:

[0064] Determining, according to the data transmission auxiliary information, whether the data cached by the core network device only contains SDT data;

[0065] In the case where it is determined that only SDT data exists, determining to initiate MT-SDT paging;

[0066] If it is determined that only SDT data does not exist, it is determined to initiate non-MT-SDT paging.

[0067] Optionally, determining, according to the data transmission auxiliary information, whether the data cached by the core network device contains only SDT data includes:

[0068] Under the first condition, it is determined that only SDT data exists in the data cached by the core network device;

[0069] The first condition includes at least one of the following:

[0070] The data transmission auxiliary information only carries the data size, and the data size is smaller than the first threshold;

[0071] The data transmission auxiliary information only carries the total data size, and the total data size is smaller than the second threshold;

[0072] The data transmission auxiliary information carries only the second indication information, and the second indication information indicates that the data size of each QoS flow is smaller than the first threshold;

[0073] The data transmission auxiliary information carries only the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

[0074] Optionally, the operation further includes:

[0075] Before receiving the data transmission auxiliary information sent by the core network device, sending an acquisition request to the core network device through the transceiver; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or the non-SDT bearer;

[0076] The receiving of data transmission auxiliary information sent by the core network device includes:

[0077] The data transmission auxiliary information sent by the core network device according to the acquisition request is received.

[0078] Optionally, the acquisition request further carries: a data threshold and at least one of request information for requesting the core network device to feed back the first information;

[0079] The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer;

[0080] The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

[0081] Optionally, the operation further includes:

[0082] Before sending the data cached by the core network device to the terminal that has been successfully paged, receiving, by the transceiver, the data cached by the core network device that is directly sent by the core network device after sending the data transmission auxiliary information;

[0083] Alternatively, before sending the data cached by the core network device to the terminal that has successfully been paged, a data sending request is sent to the core network device via the transceiver; and the data cached by the core network device sent by the core network device according to the data sending request is received.

[0084] The embodiment of the present application further provides a data transmission device, which is a core network device and includes a memory, a transceiver, and a processor:

[0085] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0086] Determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0087] The data transmission auxiliary information is sent to a wireless access network device through the transceiver.

[0088] Optionally, the data size related information includes at least one of the following:

[0089] The data size of each QoS flow mapped to an SDT bearer;

[0090] The total data size of all QoS flows mapped to one SDT bearer;

[0091] Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold;

[0092] The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

[0093] Optionally, the operation further includes:

[0094] Before determining the data transmission auxiliary information, receiving, by the transceiver, an acquisition request sent by the wireless access network device; the acquisition request carries an identifier of a QoS flow mapped to an SDT bearer or a non-SDT bearer;

[0095] The determining of data transmission auxiliary information includes:

[0096] According to the acquisition request, data transmission auxiliary information is determined.

[0097] Optionally, the acquisition request further carries: a data threshold and at least one of request information for requesting the core network device to feed back the first information;

[0098] The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer;

[0099] The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

[0100] Optionally, the operation further includes:

[0101] After sending the data transmission auxiliary information to the wireless access network device, directly sending the data cached by the core network device to the wireless access network device through the transceiver;

[0102] Alternatively, after sending the data transmission auxiliary information to the wireless access network device, receiving a data sending request sent by the wireless access network device through the transceiver; and sending the data cached by the core network device to the wireless access network device according to the data sending request.

[0103] The embodiment of the present application further provides a data transmission device, which is applied to a wireless access network device, including:

[0104] A first receiving unit is configured to receive data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to a data size corresponding to a small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0105] A first determining unit, configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information;

[0106] The first sending unit is used to send the data cached by the core network device to the terminal that has been successfully paged.

[0107] Optionally, the data size related information includes at least one of the following:

[0108] The data size of each QoS flow mapped to an SDT bearer;

[0109] The total data size of all QoS flows mapped to one SDT bearer;

[0110] Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold;

[0111] The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

[0112] Optionally, the determining whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information includes:

[0113] Determining, according to the data transmission auxiliary information, whether the data cached by the core network device only contains SDT data;

[0114] In the case where it is determined that only SDT data exists, determining to initiate MT-SDT paging;

[0115] If it is determined that only SDT data does not exist, it is determined to initiate non-MT-SDT paging.

[0116] Optionally, determining, according to the data transmission auxiliary information, whether the data cached by the core network device contains only SDT data includes:

[0117] Under the first condition, it is determined that only SDT data exists in the data cached by the core network device;

[0118] The first condition includes at least one of the following:

[0119] The data transmission auxiliary information only carries the data size, and the data size is smaller than the first threshold;

[0120] The data transmission auxiliary information only carries the total data size, and the total data size is smaller than the second threshold;

[0121] The data transmission auxiliary information carries only the second indication information, and the second indication information indicates that the data size of each QoS flow is smaller than the first threshold;

[0122] The data transmission auxiliary information carries only the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

[0123] Optionally, also include:

[0124] A second sending unit is used to send an acquisition request to the core network device before receiving the data transmission auxiliary information sent by the core network device; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or the non-SDT bearer;

[0125] The receiving of data transmission auxiliary information sent by the core network device includes:

[0126] The data transmission auxiliary information sent by the core network device according to the acquisition request is received.

[0127] Optionally, the acquisition request further carries: a data threshold and at least one of request information for requesting the core network device to feed back the first information;

[0128] The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer;

[0129] The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

[0130] Optionally, also include:

[0131] A second receiving unit is configured to receive the data cached by the core network device directly sent by the core network device after sending the data transmission auxiliary information, before sending the data cached by the core network device to the terminal that has successfully been paged;

[0132] Alternatively, the first transceiver unit is used to send a data sending request to the core network device before sending the data cached by the core network device to the terminal that has successfully been paged; and receive the data cached by the core network device sent by the core network device according to the data sending request.

[0133] The embodiment of the present application also provides a data transmission device, which is applied to a core network device, including:

[0134] A second determination unit is used to determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, and the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0135] The third sending unit is used to send the data transmission auxiliary information to the wireless access network device.

[0136] Optionally, the data size related information includes at least one of the following:

[0137] The data size of each QoS flow mapped to an SDT bearer;

[0138] The total data size of all QoS flows mapped to one SDT bearer;

[0139] Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold;

[0140] The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

[0141] Optionally, also include:

[0142] A third receiving unit is used to receive an acquisition request sent by the wireless access network device before determining the data transmission auxiliary information; the acquisition request carries an identifier of a QoS flow mapped to an SDT bearer or a non-SDT bearer;

[0143] The determining of data transmission auxiliary information includes:

[0144] According to the acquisition request, data transmission auxiliary information is determined.

[0145] Optionally, the acquisition request further carries: a data threshold and at least one of request information for requesting the core network device to feed back the first information;

[0146] The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer;

[0147] The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

[0148] Optionally, also include:

[0149] A fourth sending unit, configured to send the data cached by the core network device directly to the wireless access network device after sending the data transmission auxiliary information to the wireless access network device;

[0150] Alternatively, the second transceiver unit is used to receive a data sending request sent by the wireless access network device after sending the data transmission auxiliary information to the wireless access network device; and send the data cached by the core network device to the wireless access network device according to the data sending request.

[0151] An embodiment of the present application also provides a non-transitory readable storage medium, which stores a computer program, and the computer program is used to enable a processor to execute the above-mentioned method on the wireless access network device side or the core network device side.

[0152] The beneficial effects of the above technical solution of the present application are as follows:

[0153] In the above scheme, the data transmission method receives data transmission auxiliary information sent by the core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; according to the data transmission auxiliary information, determine whether to initiate downlink small data transmission MT-SDT paging; send the data cached by the core network device to the terminal that successfully paging; can support accurate SDT, and well solve the problem that SDT cannot be accurately performed in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0154] Figure 1 A schematic diagram of the wireless communication system architecture of an embodiment of the present application;

[0155] Figure 2 A schematic diagram of a radio resource control state transition according to an embodiment of the present application;

[0156] Figure 3 This is a schematic diagram of core network cache data in an embodiment of the present application;

[0157] Figure 4 This is a schematic diagram of a core network cache data notification according to an embodiment of the present application;

[0158] Figure 5 The data transmission method of the present invention is shown in the following figure. Figure 1 ;

[0159] Figure 6 The data transmission method of the present invention is shown in the following figure. Figure 2 ;

[0160] Figure 7 The data transmission device structure of the embodiment of the present application is shown in FIG. Figure 1 ;

[0161] Figure 8 The data transmission device structure of the embodiment of the present application is shown in FIG. Figure 2 ;

[0162] Fig. 9 The structure of the data transmission device of the embodiment of the present application is shown as follows: Figure 1 ;

[0163] Fig.10 The structure of the data transmission device of the embodiment of the present application is shown as follows: Figure 2 . DETAILED DESCRIPTION

[0164] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0165] In the embodiments of the present application, the term "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0166] In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0167] It is explained here that the technical solution provided in the embodiment of the present application can be applicable to a variety of systems, especially 5G systems. For example, the applicable system can be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, a long term evolution (LTE) system, a LTE frequency division duplex (FDD) system, a LTE time division duplex (TDD) system, an advanced long term evolution (LTE-A) system, a universal mobile telecommunication system (UMTS), a world-wide interoperability for microwave access (WiMAX) system, a 5G new air interface (NR) system, etc. These various systems include terminal equipment and network equipment. The system may also include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), etc.

[0168] Figure 1A block diagram of a wireless communication system applicable to the embodiments of the present application is shown. The wireless communication system includes a terminal device (also referred to as a terminal) and a network device.

[0169] The terminal device involved in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device may be called a user equipment (UE). The wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal device. For example, it can be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges language and / or data with a wireless access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA) and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, and a user device, but is not limited in the embodiments of the present application.

[0170] The network device involved in the embodiments of the present application may be a base station, which may include multiple cells providing services for the terminal. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, and serve as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile communications (Global System for Mobile communications, GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolutionary network device (evolutional Node B, eNB or e-NodeB) in the long-term evolution (long term evolution, LTE) system, a 5G base station (the next Generation Node B, gNB) in the 5G network architecture (next generation system), or a home evolved Node B (Home evolved Node B, HeNB), a relay node, a home base station (femto), a pico base station (pico), etc., which is not limited in the embodiments of the present application. In some network structures, the network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be arranged geographically separately.

[0171] Network devices and terminal devices can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). Depending on the form and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can be diversity transmission, precoded transmission or beamforming transmission, etc.

[0172] The following first introduces the contents involved in the solution provided in the embodiment of the present application.

[0173] (1) Definition and characteristics of the Inactive state;

[0174] In the Long Term Evolution (LTE) system, the access layer has only two states: IDLE and Connected. In the standardization research of 5G New Radio (NR), in addition to the two states of LTE, a third state is introduced: Inactive state.

[0175] The characteristics of the Inactive state are: from the core network point of view, the user equipment (UE) is still in the CM_Connected state (non-access layer state), and the radio access network (RAN) and the UE both retain the UE's access layer context; but the UE's air interface resources are released, which is very similar to the Idle state. The UE can reselect cells, receive system information broadcasts and paging messages in the Inactive state. The difference from the Idle state is that in the Inactive state, the UE can quickly recover to the connected state.

[0176] The relationship between the above three radio resource control (RRC) states can be as follows: Figure 2 shown.

[0177] (2) Enhanced Discontinuous Reception (eDRX) in inactive mode;

[0178] Now inactive UE supports eDRX greater than 10.24s, up to nearly 3 hours; the base station can instruct the core network to buffer data. Because an inactive UE with eDRX greater than 10.24s can be considered unreachable for a long time (nearly 3 hours), the core network can save the relevant data of the UE instead of sending it to the base station.

[0179] Specifically, Figure 3 As shown, the base station sends the NR application protocol (NG Application Protocol, NGAP) MTCOMMUNICATION HANDLING REQUEST (mobile interruption communication processing request or mobile terminal termination communication processing request or downlink communication processing request) to the core network, which carries a choice structure: when the base station wants the core network to buffer data (activate the core network buffer mechanism), it sends NR Paging eDRX Cycle for RRC INACTIVE (new radio paging enhanced discontinuous reception cycle in radio resource control inactive state) and / or NR Paging TimeWindow for RRC_INACTIVE (new radio paging time window in radio resource control inactive state) and / or NR PTWStart (new radio paging time window start) to the core network, and the core network can know when the UE is in an unreachable state, and then buffer the data, and feedback the mobile terminal termination communication processing response; when the base station believes that the core network does not need to buffer data, for example, the base station executes MO-SDT (mobile terminal initiates small data transmission, or uplink small data transmission) or the UE resumes the connection state, the base station sends HLcom to the core network. The Deactivate indication is displayed as true, which means that the core network does not need buffer data.

[0180] When the core network buffers the downlink user data, before the paging cycle of the UE arrives, Figure 4As shown, a NGAP DL DATA NOTIFICATION message is first triggered to indicate to the base station that there is data buffered in the core network, and the base station is requested to initiate a RAN paging process. Under normal circumstances (non-MT-SDT (Mobile Terminated Small Data Transmission), the base station will trigger RAN paging after receiving the downlink data notification message from the core network, convert the UE in the inactive state to the connected state, and then send the downlink (DL) data to the UE.

[0181] (3) MT-SDT (Mobile Terminated Small Data Transmission);

[0182] In the normal Inactive state, the arrival of UE uplink (UL) or DL ​​data will trigger the UE to switch from Inactive to Connected state, and then complete the data transmission in Connected state. MT-SDT is a small downlink data transmission method in Inactive state. UE can also perform DL data transmission without returning to RRC connected state.

[0183] Currently, in MT-SDT in RRC inactive state, during the process of establishing or modifying the bearer context, CU-CP (here can be gNB-CU-CP, i.e., the control plane node of the centralized unit of gNB) requests CU-UP (here can be gNB-CU-UP, i.e., the user plane node of the centralized unit of gNB) to provide MT-SDT information. When CU-UP detects that there is DL data, it sends E1AP DL DATA NOTIFICATION (E1 interface downlink data notification) to CU-CP and carries MT-SDT information, or, when CU-CP receives DL signaling, CU-CP triggers F1 Paging (paging of F1 interface) and carries MT-SDT information (such as MT-SDT indication); DU (here can be gNB-DU, i.e., the distributed unit of gNB) sends a paging message to UE, which carries MT-SDT indication. Among them: CU-CP decides whether to use MT-SDT.

[0184] Based on the above, the embodiments of the present application provide a data transmission method, device and equipment to solve the problem that SDT cannot be accurately performed in the prior art. Among them, the method, device and equipment are based on the same application concept. Since the principles of solving the problems by the method, device and equipment are similar, the implementation of the method, device and equipment can refer to each other, and the repeated parts will not be repeated.

[0185] The data transmission method provided in the embodiment of the present application is applied to a wireless access network device, such as Figure 5 As shown, including:

[0186] Step 51: Receive data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to the data size corresponding to the small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0187] Step 52: Determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information;

[0188] Step 53: Send the data cached by the core network device to the terminal that has been successfully paged.

[0189] The data transmission method provided in the embodiment of the present application is through receiving data transmission auxiliary information sent by the core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; determine whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information; send the data cached by the core network device to the terminal where the paging is successful; and be able to support accurate SDT, which is a good solution to the problem of inability to accurately perform SDT in the prior art.

[0190] Among them, the data size related information includes at least one of the following: the data size of each QoS flow mapped to an SDT bearer; the total data size of all QoS flows mapped to an SDT bearer; second indication information indicating that the data size of each QoS flow mapped to an SDT bearer is greater than or less than a first threshold; third indication information indicating that the total data size of all QoS flows mapped to an SDT bearer is greater than or less than a second threshold.

[0191] In this way, the wireless access network device can be supported to determine whether to initiate MT-SDT paging in multiple ways.

[0192] In the embodiment of the present application, determining whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information includes: determining whether the data cached by the core network device only contains SDT data based on the data transmission auxiliary information; if it is determined that only SDT data exists, determining to initiate MT-SDT paging; if it is determined that only SDT data exists, determining to initiate non-MT-SDT paging.

[0193] In this way, it can be accurately determined whether to initiate MT-SDT paging.

[0194] Among them, determining whether the data cached by the core network device only contains SDT data based on the data transmission auxiliary information includes: under a first condition, determining that the data cached by the core network device only contains SDT data; wherein, the first condition includes at least one of the following: the data transmission auxiliary information only carries the data size, and the data size is less than the first threshold; the data transmission auxiliary information only carries the total data size, and the total data size is less than the second threshold; the data transmission auxiliary information only carries the second indication information, and the second indication information indicates that the data size of each QoS flow is less than the first threshold; the data transmission auxiliary information only carries the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

[0195] In this way, it can be accurately determined whether the data cached by the core network device only contains SDT data.

[0196] Furthermore, before receiving the data transmission auxiliary information sent by the core network device, it also includes: sending an acquisition request to the core network device; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or non-SDT bearer; the receiving of the data transmission auxiliary information sent by the core network device includes: receiving the data transmission auxiliary information sent by the core network device according to the acquisition request.

[0197] This can support wireless access network equipment to actively obtain data transmission auxiliary information.

[0198] The acquisition request also carries: a data threshold and at least one of request information for requesting the core network device to feedback first information; (1) the data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to an SDT bearer; (2) the first information includes: the data size of each QoS flow mapped to an SDT bearer, and / or the total data size of all QoS flows mapped to an SDT bearer.

[0199] This makes it easier for core network devices to accurately feedback information.

[0200] Furthermore, before sending the data cached by the core network device to the terminal that has successfully been paged, it also includes: receiving the data cached by the core network device that is directly sent by the core network device after sending the data transmission auxiliary information; or, sending a data sending request to the core network device; receiving the data cached by the core network device that is sent by the core network device according to the data sending request.

[0201] This can support multiple modes of transmitting data cached by core network devices.

[0202] The present application also provides a data transmission method, which is applied to a core network device, such as Figure 6 As shown, including:

[0203] Step 61: Determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to the data size corresponding to the small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0204] Step 62: Send the data transmission auxiliary information to the wireless access network device.

[0205] The data transmission method provided in the embodiment of the present application determines data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; the data transmission auxiliary information is sent to the wireless access network device; it can support the wireless access network device to determine whether to initiate MT-SDT paging based on this, and then accurately perform SDT, which well solves the problem of inability to accurately perform SDT in the prior art.

[0206] Among them, the data size related information includes at least one of the following: the data size of each QoS flow mapped to an SDT bearer; the total data size of all QoS flows mapped to an SDT bearer; second indication information indicating that the data size of each QoS flow mapped to an SDT bearer is greater than or less than a first threshold; third indication information indicating that the total data size of all QoS flows mapped to an SDT bearer is greater than or less than a second threshold.

[0207] In this way, the wireless access network device can be supported to determine whether to initiate MT-SDT paging in multiple ways.

[0208] Furthermore, before determining the data transmission auxiliary information, it also includes: receiving an acquisition request sent by the wireless access network device; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or non-SDT bearer; the determination of the data transmission auxiliary information includes: determining the data transmission auxiliary information according to the acquisition request.

[0209] This can support wireless access network equipment to actively obtain data transmission auxiliary information.

[0210] The acquisition request also carries: a data threshold and at least one of request information for requesting the core network device to feedback first information; (1) the data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to an SDT bearer; (2) the first information includes: the data size of each QoS flow mapped to an SDT bearer, and / or the total data size of all QoS flows mapped to an SDT bearer.

[0211] This makes it easier for core network devices to accurately feedback information.

[0212] Furthermore, after sending the data transmission auxiliary information to the wireless access network device, it also includes: directly sending the data cached by the core network device to the wireless access network device; or, receiving a data sending request sent by the wireless access network device; and sending the data cached by the core network device to the wireless access network device according to the data sending request.

[0213] This can support multiple modes of transmitting data cached by core network devices.

[0214] The data transmission method provided in the embodiment of the present application is illustrated below by taking a base station as an example of a wireless access network device.

[0215] In response to the above technical problems, an embodiment of the present application provides a data transmission method, which can be specifically implemented as a method for transmitting small data under enhanced discontinuous reception (also referred to as a method for transmitting MT-SDT under eDRX), which can solve the problem of how the core network handles small data packets when the base station instructs the core network to buffer data for an RRC (Radio Resource Control) inactive UE (User Equipment) configured with eDRX (Enhanced Discontinuous Reception).

[0216] This plan mainly involves the following contents:

[0217] (1) The base station sends a QoS flow Identity (QFI) of a QoS flow mapped to SDT bearers and / or non-SDT bearers to the core network, and requests the core network to provide the base station with data size information of the QFI corresponding to the SDT bearers; corresponding to the above, sending an acquisition request to the core network device; the acquisition request carries the identifier of the QoS flow mapped to the SDT bearer or the non-SDT bearer; and receiving data transmission auxiliary information sent by the core network device according to the acquisition request.

[0218] (2) The core network can provide the base station with the data size information of the QFI corresponding to the SDT bearers per QoS flow (corresponding to the data size of each QoS flow mapped to an SDT bearer as mentioned above), or provide the data size per SDT, that is, the sum of the data sizes on all QFIs corresponding to the SDT bearers (total SDT data size, corresponding to the total data size of all QoS flows mapped to an SDT bearer as mentioned above).

[0219] (3) The base station determines whether to perform MT-SDT paging or non-MT-SDT paging based on the information provided by the core network, and initiates air interface paging and / or RAN paging; corresponding to the above-mentioned determination of whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information.

[0220] Specifically, if the data on the SDT bearer is greater than a threshold (for example, the data size is less than the first threshold or the total data size is less than the second threshold) or there is data on the non-SDT bearer, non-MT-SDT paging may be initiated;

[0221] (4) The core network sends the buffered data. The base station sends the data to the UE after the paging is successful (corresponding to the above-mentioned sending of the data buffered by the core network device to the terminal after the paging is successful). Optionally, the base station can instruct the core network to send the data (corresponding to the above-mentioned sending of the data sending request to the core network device; receiving the data buffered by the core network device sent by the core network device according to the data sending request). This message can be indicated after the RAN paging is successful, or it can be appropriately indicated in advance (without limitation).

[0222] In summary, this solution can be understood as follows: the base station sends the SDT identifier (i.e., the QFI of the QoS flow on the above-mentioned SDT bearers) to the core network in an explicit or implicit manner; the core network feeds back the data size corresponding to the SDT bearer and / or whether non-SDT data is cached, and the base station performs MT-SDT paging or non-MT-SDT paging accordingly.

[0223] Specifically, the above content can be implemented as follows:

[0224] (1) The base station sends an NGAP MT COMMUNICATION HANDLING REQUEST to the core network, carrying one or more of the following information:

[0225] 1) The QFI of the QoS flow mapped to the SDT bearers (corresponding to the identifier of the QoS flow mapped to the SDT bearer carried in the above acquisition request);

[0226] 2) The QFI of the QoS flow mapped to non-SDT bearers (corresponding to the identifier of the QoS flow mapped to the non-SDT bearer carried in the above acquisition request);

[0227] 3) Requesting the core network (such as AMF) to provide explicit indication information of the data size (related information) of the SDT bearer (corresponding to the request information for requesting the core network device to feedback the first information). Optionally, it includes indicating that the core network should provide per QoS data size related information or per SDT data size related information (corresponding to the first information including: the data size of each QoS flow mapped to an SDT bearer, or the total data size of all QoS flows mapped to an SDT bearer).

[0228] 4) Data size threshold (data size threshold per QoS flow or per SDT); corresponding to the above data threshold, the data threshold includes: a data size threshold for each QoS flow, or a total data size threshold for all QoS flows mapped to an SDT bearer. The thresholds may be the same or different, which is not limited here.

[0229] (2) The core network sends an NGAP DL DATA NOTIFICATION to the base station, carrying one or more of the following information:

[0230] 1) Data size related information. The data size can be expressed in one or more of the following ways:

[0231] a. Per SDT data size, that is, the total data size of all QoS flows mapped to the SDT bearer (corresponding to the total data size of all QoS flows mapped to one SDT bearer as mentioned above);

[0232] b. The data size per QoS flow, i.e. the data size of each QFI mapped to SDT bearers (corresponding to the data size of each QoS flow mapped to an SDT bearer as mentioned above);

[0233] c. The indicated data size per SDT is greater than or less than a threshold value (corresponding to the third indication information indicating that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold value);

[0234] d. The indicated data size of each QoS flow (each QFI mapped to SDT bearers) is greater than or less than a threshold (corresponding to the second indication information indicating that the data size of each QoS flow mapped to an SDT bearer is greater than or less than the first threshold);

[0235] 2) Indication information of whether the core network buffers non-SDT data (corresponding to the above-mentioned first indication information, the first indication information is used to indicate whether the core network device buffers non-SDT data).

[0236] (3) After the base station receives the NGAP DL DATA NOTIFICATION sent by the core network, the base station can determine whether to perform MT-SDT paging or non-MT-SDT paging based on the information provided by the core network, and then initiate corresponding air interface paging and / or RAN paging (corresponding to the above-mentioned determination of whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information).

[0237] 1) If the NGAP DL DATA NOTIFICATION sent by the core network only contains the data size (per SDT and / or per QoSflow), and the base station believes that small data transmission can be performed based on the data size (for example, the threshold condition is met), the base station triggers the air interface paging and / or RAN paging of MT-SDT (paging); corresponding to the above-mentioned first condition, at least one of the following is included: the data transmission auxiliary information only carries the data size, and the data size is less than the first threshold; the data transmission auxiliary information only carries the total data size, and the total data size is less than the second threshold.

[0238] 2) If the NGAP DL DATA NOTIFICATION sent by the core network does not contain the data size, the base station triggers non-MT-SDT (paging) air interface paging and / or RAN paging;

[0239] 3) If the NGAP DL DATA NOTIFICATION sent by the core network includes both the data size and the indication information of the buffered non-SDT data, the base station triggers non-MT-SDT (paging) air interface paging and / or RAN paging.

[0240] 4) If the NGAP DL DATA NOTIFICATION sent by the core network only includes an indication that the data size is smaller than the threshold, and the base station determines that small data transmission can be performed, the base station triggers air interface paging and / or RAN paging of MT-SDT; corresponding to the above-mentioned first condition, at least one of the following items is included: the data transmission auxiliary information only carries the second indication information, and the second indication information indicates that the data size of each QoS flow is smaller than the first threshold; the data transmission auxiliary information only carries the third indication information, and the third indication information indicates that the total data size is smaller than the second threshold.

[0241] (4) The core network can directly send data after sending NGAP DL DATA NOTIFICATION (corresponding to the above-mentioned direct sending of the data cached by the core network device to the wireless access network device), and the specific time is not defined. Optionally, after the base station successfully triggers paging, the base station can instruct the core network to send data (corresponding to the above-mentioned receiving the data sending request sent by the wireless access network device; according to the data sending request, sending the data cached by the core network device to the wireless access network device). This process can also be appropriately advanced. For example, the base station instructs the core network to send data at the same time as triggering the paging, without waiting for the base station to successfully trigger the paging.

[0242] It may be that when the core network determines that the UE is reachable, it notifies the base station through an NG interface message (ie, DL DATANOTIFICATION), and then the base station instructs the core network to send data, but the present invention is not limited thereto.

[0243] The following is a specific example of this solution.

[0244] Example 1:

[0245] 1. The base station releases the UE supporting SDT to the RRC inactive state and configures eDRX to be greater than 10.24s. The base station can send an NGAP MT COMMUNICATION HANDLING REQUEST to the core network to request the core network to buffer data. In addition, it can also carry A) and / or B) to instruct the core network to provide data size related information (implicit indication). The specific contents of A) and B) are as follows:

[0246] A) The QFI of the QoS flow mapped to the SDT bearer;

[0247] B) Data size threshold (per QoS flow or per SDT).

[0248] Based on the above, the core network operations include the following:

[0249] 1) When the base station provides A), the core network can provide the data size per SDT, that is, the total data size of all data mapped to the SDT bearer.

[0250] 2) When the base station provides A), the core network can also provide the data size per QoS flow, that is, the data size of each QFI mapped to SDT bearers.

[0251] 3) When the base station provides A) and B), the core network can provide whether all data mapped to the SDT bearer exceeds the data size threshold per SDT.

[0252] 4) When the base station provides A) and B), the core network can also provide per QoS flow whether these QoS flows mapped to the SDTbearer exceed the corresponding data size threshold.

[0253] In addition, based on the above A) or A)+B), an additional explicit indication may be sent to explicitly indicate the core network to provide data size related information. The indication may further indicate whether the core network provides per QoS flow or per SDT data size related information.

[0254] 2. When the base station receives the NGAP DL DATA NOTIFICATION sent by the core network, the base station can determine whether to perform MT-SDT paging or non-MT-SDT paging based on the information provided by the core network, and then initiate the corresponding air interface paging and / or RAN paging. The specific examples are as follows:

[0255] 1) If the NGAP DL DATA NOTIFICATION sent by the core network only contains the data size (per SDT and / or per QoSflow), and the base station believes that small data transmission can be performed based on the data size, MT-SDT paging is triggered (i.e., the base station triggers air interface paging and / or RAN paging of MT-SDT (paging));

[0256] 2) If the NGAP DL DATA NOTIFICATION sent by the core network does not include the data size, the base station triggers non-MT-SDT paging (i.e., the base station triggers air interface paging and / or RAN paging of non-MT-SDT (paging));

[0257] 3) If the NGAP DL DATA NOTIFICATION sent by the core network includes both the data size and the indication information of the buffered non-SDT data, the base station triggers non-MT-SDT paging (air interface paging and / or RAN paging).

[0258] 3. The core network can directly send data after sending NGAP DL DATA NOTIFICATION, and the specific time is not defined. Optionally, after the base station successfully triggers paging, the base station can instruct the core network to send data. This process can also be appropriately advanced. For example, triggering paging instructs the core network to send data without waiting for (the base station) to successfully trigger paging, but it is not limited to this.

[0259] Example 2:

[0260] 1. The base station releases the UE supporting SDT to the RRC inactive state and configures eDRX greater than 10.24s. The base station can send an NGAP MT COMMUNICATION HANDLING REQUEST to the core network to request the core network to buffer data. In addition, it also carries C) and / or B) to instruct the core network to provide data size related information (implicit indication). The specific contents of C) and B) are as follows:

[0261] C) Carry the QFI of the QoS flow mapped to the non-SDT bearer;

[0262] B) Data size threshold (per QoS flow or per SDT).

[0263] Based on C), the core network provides the data size of the remaining data packets except the indicated QFI, that is, the data size of the data packets mapped to the QoS flow on the SDT bearer.

[0264] Based on the above, the core network operations include the following:

[0265] 1) When the base station provides C), the core network can provide the data size per SDT, that is, the total data size of all data mapped to the SDT bearer.

[0266] 2) When the base station provides C), the core network can also provide the data size per QoS flow, that is, the data size of each QFI mapped to SDT bearers.

[0267] 3) When the base station provides C) and B), the core network can provide whether all data mapped to the SDT bearer exceeds the data size threshold per SDT.

[0268] 4) When the base station provides C) and B), the core network can also provide per QoS flow whether these QoS flows mapped to the SDTbearer exceed the corresponding data size threshold.

[0269] In addition, based on the above C) or C)+B), an additional explicit indication may be sent to explicitly indicate the core network to provide data size related information. The indication may further indicate whether the core network provides per QoS flow or per SDT data size related information.

[0270] 2. When the base station receives the NGAP DL DATA NOTIFICATION sent by the core network, the base station can determine whether to perform MT-SDT paging or non-MT-SDT paging based on the information provided by the core network, and then initiate the corresponding air interface paging and / or RAN paging. The specific examples are as follows:

[0271] 1) If the NGAP DL DATA NOTIFICATION sent by the core network only contains the data size (per SDT and / or per QoSflow), and the base station believes that small data transmission can be performed based on the data size, MT-SDT paging is triggered (i.e., the base station triggers air interface paging and / or RAN paging of MT-SDT (paging));

[0272] 2) If the NGAP DL DATA NOTIFICATION sent by the core network does not include the data size, the base station triggers non-MT-SDT paging (i.e., the base station triggers air interface paging and / or RAN paging of non-MT-SDT (paging));

[0273] 3) If the NGAP DL DATA NOTIFICATION sent by the core network includes both the data size and the indication information of the buffered non-SDT data, the base station triggers non-MT-SDT paging (air interface paging and / or RAN paging).

[0274] 3. The core network can directly send data after sending NGAP DL DATA NOTIFICATION, and the specific time is not defined. Optionally, after the base station successfully triggers paging, the base station can instruct the core network to send data. This process can also be appropriately advanced. For example, triggering paging instructs the core network to send data without waiting for (the base station) to successfully trigger paging, but it is not limited to this.

[0275] Based on the above, this solution introduces a small data transmission mechanism for enhanced discontinuous reception: for inactive UEs with eDRX greater than 10.24s, the base station can request the core network to buffer data; when the core network believes that the UE is reachable, it triggers the base station to perform RAN paging, and the core network releases the buffered data. For MT-SDT, the base station can determine whether to trigger MT-SDT paging based on the amount of data; if the amount of data is small, the base station can trigger MT-SDT paging, and the UE does not need to enter the connected state.

[0276] The embodiment of the present application also provides a data transmission device, wherein the data transmission device is a wireless access network device, such as Figure 7 As shown, it includes a memory 71, a transceiver 72, and a processor 73:

[0277] The memory 71 is used to store computer programs; the transceiver 72 is used to send and receive data under the control of the processor 73; the processor 73 is used to read the computer program in the memory 71 and perform the following operations:

[0278] Receiving data transmission auxiliary information sent by a core network device through the transceiver 72; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to a small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0279] Determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information;

[0280] The data cached by the core network device is sent to the terminal successfully paged via the transceiver 72.

[0281] The data transmission device provided in the embodiment of the present application receives data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: a first indication information and at least one item of information related to the data size corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; determine whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information; send the data cached by the core network device to the terminal where the paging is successful; and be able to support accurate SDT, which is a good solution to the problem of inability to accurately perform SDT in the prior art.

[0282] Specifically, the transceiver 72 is used to receive and send data under the control of the processor 73.

[0283] Among them, Figure 7 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 73 and various circuits of memory represented by memory 71 are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 72 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which transmission medium may include a wireless channel, a wired channel, an optical cable, and other transmission media. The processor 73 is responsible for managing the bus architecture and general processing, and the memory 71 may store data used by the processor 73 when performing operations.

[0284] The processor 73 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (CPLD). The processor may also adopt a multi-core architecture.

[0285] Among them, the data size related information includes at least one of the following: the data size of each QoS flow mapped to an SDT bearer; the total data size of all QoS flows mapped to an SDT bearer; second indication information indicating that the data size of each QoS flow mapped to an SDT bearer is greater than or less than a first threshold; third indication information indicating that the total data size of all QoS flows mapped to an SDT bearer is greater than or less than a second threshold.

[0286] In the embodiment of the present application, determining whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information includes: determining whether the data cached by the core network device only contains SDT data based on the data transmission auxiliary information; if it is determined that only SDT data exists, determining to initiate MT-SDT paging; if it is determined that only SDT data exists, determining to initiate non-MT-SDT paging.

[0287] Among them, determining whether the data cached by the core network device only contains SDT data based on the data transmission auxiliary information includes: under a first condition, determining that the data cached by the core network device only contains SDT data; wherein, the first condition includes at least one of the following: the data transmission auxiliary information only carries the data size, and the data size is less than the first threshold; the data transmission auxiliary information only carries the total data size, and the total data size is less than the second threshold; the data transmission auxiliary information only carries the second indication information, and the second indication information indicates that the data size of each QoS flow is less than the first threshold; the data transmission auxiliary information only carries the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

[0288] Furthermore, the operation also includes: before receiving the data transmission auxiliary information sent by the core network device, sending an acquisition request to the core network device through the transceiver; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or non-SDT bearer; the receiving of the data transmission auxiliary information sent by the core network device includes: receiving the data transmission auxiliary information sent by the core network device according to the acquisition request.

[0289] In an embodiment of the present application, the acquisition request also carries: a data threshold and at least one of request information for requesting the core network device to feedback first information; wherein, (1) the data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to an SDT bearer; (2) the first information includes: the data size of each QoS flow mapped to an SDT bearer, and / or the total data size of all QoS flows mapped to an SDT bearer.

[0290] Furthermore, the operation also includes: before sending the data cached by the core network device to the terminal that has successfully been paged, receiving, via the transceiver, the data cached by the core network device that is directly sent by the core network device after sending the data transmission auxiliary information; or, before sending the data cached by the core network device to the terminal that has successfully been paged, sending a data sending request to the core network device via the transceiver; and receiving the data cached by the core network device that is sent by the core network device according to the data sending request.

[0291] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned wireless access network device side method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as the method embodiment in this embodiment will not be described in detail here.

[0292] The embodiment of the present application also provides a data transmission device, wherein the data transmission device is a core network device, such as Figure 8 As shown, it includes a memory 81, a transceiver 82, and a processor 83:

[0293] The memory 81 is used to store computer programs; the transceiver 82 is used to send and receive data under the control of the processor 83; the processor 83 is used to read the computer program in the memory 81 and perform the following operations:

[0294] Determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0295] The data transmission auxiliary information is sent to the wireless access network device through the transceiver 82.

[0296] The data transmission device provided in the embodiment of the present application determines data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; sends the data transmission auxiliary information to the wireless access network device; can support the wireless access network device to determine whether to initiate MT-SDT paging based on this, and then accurately perform SDT, which well solves the problem of inability to accurately perform SDT in the prior art.

[0297] Specifically, the transceiver 82 is used to receive and send data under the control of the processor 83.

[0298] Among them, Figure 8 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 83 and various circuits of memory represented by memory 81 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 82 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which transmission medium may include a wireless channel, a wired channel, an optical cable, and other transmission media. The processor 83 is responsible for managing the bus architecture and general processing, and the memory 81 may store data used by the processor 83 when performing operations.

[0299] The processor 83 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (CPLD). The processor may also adopt a multi-core architecture.

[0300] Among them, the data size related information includes at least one of the following: the data size of each QoS flow mapped to an SDT bearer; the total data size of all QoS flows mapped to an SDT bearer; second indication information indicating that the data size of each QoS flow mapped to an SDT bearer is greater than or less than a first threshold; third indication information indicating that the total data size of all QoS flows mapped to an SDT bearer is greater than or less than a second threshold.

[0301] Furthermore, the operation also includes: before determining the data transmission auxiliary information, receiving an acquisition request sent by the wireless access network device through the transceiver; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or non-SDT bearer; the determination of the data transmission auxiliary information includes: determining the data transmission auxiliary information according to the acquisition request.

[0302] The acquisition request also carries: a data threshold and at least one of request information for requesting the core network device to feedback first information; (1) the data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to an SDT bearer; (2) the first information includes: the data size of each QoS flow mapped to an SDT bearer, and / or the total data size of all QoS flows mapped to an SDT bearer.

[0303] Furthermore, the operation also includes: after sending the data transmission auxiliary information to the wireless access network device, directly sending the data cached by the core network device to the wireless access network device through the transceiver; or, after sending the data transmission auxiliary information to the wireless access network device, receiving a data sending request sent by the wireless access network device through the transceiver; and sending the data cached by the core network device to the wireless access network device according to the data sending request.

[0304] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned core network device side method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as the method embodiment in this embodiment will not be described in detail here.

[0305] The present application also provides a data transmission device, which is applied to a wireless access network device, such as Fig. 9 As shown, including:

[0306] The first receiving unit 91 is used to receive data transmission auxiliary information sent by the core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, and the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0307] A first determining unit 92 is used to determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information;

[0308] The first sending unit 93 is configured to send the data cached by the core network device to the terminal that has been successfully paged.

[0309] The data transmission device provided in the embodiment of the present application receives data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: a first indication information and at least one item of information related to the data size corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; determine whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information; send the data cached by the core network device to the terminal where the paging is successful; and be able to support accurate SDT, which is a good solution to the problem of inability to accurately perform SDT in the prior art.

[0310] Among them, the data size related information includes at least one of the following: the data size of each QoS flow mapped to an SDT bearer; the total data size of all QoS flows mapped to an SDT bearer; second indication information indicating that the data size of each QoS flow mapped to an SDT bearer is greater than or less than a first threshold; third indication information indicating that the total data size of all QoS flows mapped to an SDT bearer is greater than or less than a second threshold.

[0311] In the embodiment of the present application, determining whether to initiate downlink small data transmission MT-SDT paging based on the data transmission auxiliary information includes: determining whether the data cached by the core network device only contains SDT data based on the data transmission auxiliary information; if it is determined that only SDT data exists, determining to initiate MT-SDT paging; if it is determined that only SDT data exists, determining to initiate non-MT-SDT paging.

[0312] Among them, determining whether the data cached by the core network device only contains SDT data based on the data transmission auxiliary information includes: under a first condition, determining that the data cached by the core network device only contains SDT data; wherein, the first condition includes at least one of the following: the data transmission auxiliary information only carries the data size, and the data size is less than the first threshold; the data transmission auxiliary information only carries the total data size, and the total data size is less than the second threshold; the data transmission auxiliary information only carries the second indication information, and the second indication information indicates that the data size of each QoS flow is less than the first threshold; the data transmission auxiliary information only carries the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

[0313] Furthermore, the data transmission device also includes: a second sending unit, used to send an acquisition request to the core network device before receiving the data transmission auxiliary information sent by the core network device; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or non-SDT bearer; the receiving of the data transmission auxiliary information sent by the core network device includes: receiving the data transmission auxiliary information sent by the core network device according to the acquisition request.

[0314] In an embodiment of the present application, the acquisition request also carries: a data threshold and at least one of request information for requesting the core network device to feedback first information; wherein, (1) the data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to an SDT bearer; (2) the first information includes: the data size of each QoS flow mapped to an SDT bearer, and / or the total data size of all QoS flows mapped to an SDT bearer.

[0315] Furthermore, the data transmission device also includes: a second receiving unit, used to receive the data cached by the core network device directly sent by the core network device after sending the data transmission auxiliary information, before sending the data cached by the core network device to the terminal that has successfully been paged; or, a first transceiver unit, used to send a data sending request to the core network device before sending the data cached by the core network device to the terminal that has successfully been paged; and receive the data cached by the core network device sent by the core network device according to the data sending request.

[0316] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned wireless access network device side method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0317] The present application also provides a data transmission device, which is applied to a core network device, such as Fig.10 As shown, including:

[0318] The second determining unit 101 is used to determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, and the first indication information is used to indicate whether the core network device has cached non-SDT data;

[0319] The third sending unit 102 is configured to send the data transmission auxiliary information to a wireless access network device.

[0320] The data transmission device provided in the embodiment of the present application determines data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; sends the data transmission auxiliary information to the wireless access network device; can support the wireless access network device to determine whether to initiate MT-SDT paging based on this, and then accurately perform SDT, which well solves the problem of inability to accurately perform SDT in the prior art.

[0321] Among them, the data size related information includes at least one of the following: the data size of each QoS flow mapped to an SDT bearer; the total data size of all QoS flows mapped to an SDT bearer; second indication information indicating that the data size of each QoS flow mapped to an SDT bearer is greater than or less than a first threshold; third indication information indicating that the total data size of all QoS flows mapped to an SDT bearer is greater than or less than a second threshold.

[0322] Furthermore, the data transmission device also includes: a third receiving unit, used to receive an acquisition request sent by the wireless access network device before determining the data transmission auxiliary information; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or non-SDT bearer; the determination of the data transmission auxiliary information includes: determining the data transmission auxiliary information according to the acquisition request.

[0323] In an embodiment of the present application, the acquisition request also carries: a data threshold and at least one of request information for requesting the core network device to feedback first information; wherein, (1) the data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to an SDT bearer; (2) the first information includes: the data size of each QoS flow mapped to an SDT bearer, and / or the total data size of all QoS flows mapped to an SDT bearer.

[0324] Furthermore, the data transmission device also includes: a fourth sending unit, used to send the data cached by the core network device directly to the wireless access network device after sending the data transmission auxiliary information to the wireless access network device; or, a second transceiver unit, used to receive a data sending request sent by the wireless access network device after sending the data transmission auxiliary information to the wireless access network device; and send the data cached by the core network device to the wireless access network device according to the data sending request.

[0325] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned core network equipment side method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as the method embodiment in this embodiment will not be described in detail here.

[0326] It should be noted that the division of units in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0327] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0328] An embodiment of the present application also provides a non-transitory readable storage medium, which stores a computer program, and the computer program is used to enable a processor to execute the above-mentioned method on the wireless access network device side or the core network device side.

[0329] The non-transitory readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical (MO)), etc.), optical storage (such as compact discs (CD), digital video discs (DVD), Blu-ray discs (BD), high-definition versatile discs (HVD), etc.), and semiconductor memories (such as ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read only memory (EEPROM), non-volatile memory (NAND (Non-volatile Memory Device) FLASH), solid-state drives (SSD)), etc.

[0330] Among them, the implementation embodiments of the method on the wireless access network device side or the core network device side are all applicable to the embodiments of the non-transitory readable storage medium, and can also achieve the same technical effect.

[0331] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0332] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer executable instructions. These computer executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0333] These processor executable instructions may also be stored in a processor readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0334] These processor-executable instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0335] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A data transmission method, applied to a wireless access network device, characterized in that: include: Receive data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to the data size corresponding to the small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data; Determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information; The data cached by the core network device is sent to the terminal that has been successfully paged.

2. The data transmission method according to claim 1, characterized in that: The data size related information includes at least one of the following: The data size of each QoS flow mapped to an SDT bearer; The total data size of all QoS flows mapped to one SDT bearer; Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold; The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

3. The data transmission method according to claim 2, characterized in that: The determining whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information includes: Determining, according to the data transmission auxiliary information, whether the data cached by the core network device only contains SDT data; In the case where it is determined that only SDT data exists, determining to initiate MT-SDT paging; If it is determined that only SDT data does not exist, it is determined to initiate non-MT-SDT paging.

4. The data transmission method according to claim 3, characterized in that: The determining, according to the data transmission auxiliary information, whether the data cached by the core network device only contains SDT data includes: Under the first condition, it is determined that only SDT data exists in the data cached by the core network device; The first condition includes at least one of the following: The data transmission auxiliary information only carries the data size, and the data size is smaller than the first threshold; The data transmission auxiliary information only carries the total data size, and the total data size is smaller than the second threshold; The data transmission auxiliary information carries only the second indication information, and the second indication information indicates that the data size of each QoS flow is smaller than the first threshold; The data transmission auxiliary information carries only the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

5. The data transmission method according to claim 1, characterized in that: Before receiving the data transmission auxiliary information sent by the core network device, it also includes: Sending an acquisition request to the core network device; the acquisition request carries an identifier of a QoS flow mapped to an SDT bearer or a non-SDT bearer; The receiving of data transmission auxiliary information sent by the core network device includes: The data transmission auxiliary information sent by the core network device according to the acquisition request is received.

6. The data transmission method according to claim 5, characterized in that: The acquisition request further carries: at least one of a data threshold and request information for requesting the core network device to feedback the first information; The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer; The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

7. The data transmission method according to claim 1, characterized in that: Before sending the data cached by the core network device to the terminal that has successfully been paged, the method further includes: receiving data cached by the core network device that is directly sent by the core network device after sending the data transmission auxiliary information; Alternatively, a data sending request is sent to the core network device; and data cached by the core network device is received and sent by the core network device according to the data sending request.

8. A data transmission method, applied to a core network device, characterized in that: include: Determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; The data transmission auxiliary information is sent to a wireless access network device.

9. The data transmission method according to claim 8, characterized in that: The data size related information includes at least one of the following: The data size of each QoS flow mapped to an SDT bearer; The total data size of all QoS flows mapped to one SDT bearer; Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold; The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

10. The data transmission method according to claim 8, characterized in that: Before determining the data transmission auxiliary information, it also includes: Receiving an acquisition request sent by the wireless access network device; the acquisition request carries an identifier of a QoS flow mapped to an SDT bearer or a non-SDT bearer; The determining of data transmission auxiliary information includes: According to the acquisition request, data transmission auxiliary information is determined.

11. The data transmission method according to claim 10, characterized in that: The acquisition request further carries: at least one of a data threshold and request information for requesting the core network device to feedback the first information; The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer; The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

12. The data transmission method according to claim 8, characterized in that: After sending the data transmission auxiliary information to the wireless access network device, the method further includes: directly sending the data cached by the core network device to the wireless access network device; Alternatively, receiving a data sending request sent by the wireless access network device; and sending the data cached by the core network device to the wireless access network device according to the data sending request.

13. A data transmission device, the data transmission device being a wireless access network device, characterized in that: Including memory, transceiver, processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: Receiving, by the transceiver, data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to a data size corresponding to a small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data; Determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information; The data cached by the core network device is sent to the terminal that has been successfully paged via the transceiver.

14. The data transmission device according to claim 13, characterized in that: The data size related information includes at least one of the following: The data size of each QoS flow mapped to an SDT bearer; The total data size of all QoS flows mapped to one SDT bearer; Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold; The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

15. The data transmission device according to claim 14, characterized in that: The determining whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information includes: Determining, according to the data transmission auxiliary information, whether the data cached by the core network device only contains SDT data; In the case where it is determined that only SDT data exists, determining to initiate MT-SDT paging; If it is determined that only SDT data does not exist, it is determined to initiate non-MT-SDT paging.

16. The data transmission device according to claim 15, characterized in that: The determining, according to the data transmission auxiliary information, whether the data cached by the core network device only contains SDT data includes: Under the first condition, it is determined that only SDT data exists in the data cached by the core network device; The first condition includes at least one of the following: The data transmission auxiliary information only carries the data size, and the data size is smaller than the first threshold; The data transmission auxiliary information only carries the total data size, and the total data size is smaller than the second threshold; The data transmission auxiliary information carries only the second indication information, and the second indication information indicates that the data size of each QoS flow is smaller than the first threshold; The data transmission auxiliary information carries only the third indication information, and the third indication information indicates that the total data size is less than the second threshold.

17. The data transmission device according to claim 13, characterized in that: The operations also include: Before receiving the data transmission auxiliary information sent by the core network device, sending an acquisition request to the core network device through the transceiver; the acquisition request carries an identifier of the QoS flow mapped to the SDT bearer or the non-SDT bearer; The receiving of data transmission auxiliary information sent by the core network device includes: The data transmission auxiliary information sent by the core network device according to the acquisition request is received.

18. The data transmission device according to claim 17, characterized in that: The acquisition request further carries: at least one of a data threshold and request information for requesting the core network device to feedback the first information; The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer; The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

19. The data transmission device according to claim 13, characterized in that: The operations also include: Before sending the data cached by the core network device to the terminal that has been successfully paged, receiving, by the transceiver, the data cached by the core network device that is directly sent by the core network device after sending the data transmission auxiliary information; Alternatively, before sending the data cached by the core network device to the terminal that has successfully been paged, a data sending request is sent to the core network device via the transceiver; and the data cached by the core network device sent by the core network device according to the data sending request is received.

20. A data transmission device, the data transmission device being a core network device, characterized in that: Including memory, transceiver, processor: a memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; A processor is configured to read the computer program in the memory and perform the following operations: Determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, the first indication information is used to indicate whether the core network device has cached non-SDT data; The data transmission auxiliary information is sent to a wireless access network device through the transceiver.

21. The data transmission device according to claim 20, characterized in that: The data size related information includes at least one of the following: The data size of each QoS flow mapped to an SDT bearer; The total data size of all QoS flows mapped to one SDT bearer; Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold; The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

22. The data transmission device according to claim 20, characterized in that: The operations also include: Before determining the data transmission auxiliary information, receiving, by the transceiver, an acquisition request sent by the wireless access network device; the acquisition request carries an identifier of a QoS flow mapped to an SDT bearer or a non-SDT bearer; The determining of data transmission auxiliary information includes: According to the acquisition request, data transmission auxiliary information is determined.

23. The data transmission device according to claim 22, characterized in that: The acquisition request further carries: at least one of a data threshold and request information for requesting the core network device to feedback the first information; The data threshold includes: a threshold for the data size of each QoS flow, and / or a threshold for the total data size of all QoS flows mapped to one SDT bearer; The first information includes: the data size of each QoS flow mapped to one SDT bearer, and / or the total data size of all QoS flows mapped to one SDT bearer.

24. The data transmission device according to claim 20, characterized in that: The operations also include: After sending the data transmission auxiliary information to the wireless access network device, directly sending the data cached by the core network device to the wireless access network device through the transceiver; Alternatively, after sending the data transmission auxiliary information to the wireless access network device, receiving a data sending request sent by the wireless access network device through the transceiver; and sending the data cached by the core network device to the wireless access network device according to the data sending request.

25. A data transmission device, applied to a wireless access network device, characterized in that: include: A first receiving unit is configured to receive data transmission auxiliary information sent by a core network device; wherein the data transmission auxiliary information includes: first indication information and at least one item of information related to a data size corresponding to a small data transmission SDT bearer, wherein the first indication information is used to indicate whether the core network device has cached non-SDT data; A first determining unit, configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the data transmission auxiliary information; The first sending unit is used to send the data cached by the core network device to the terminal that has been successfully paged.

26. The data transmission device according to claim 25, characterized in that: The data size related information includes at least one of the following: The data size of each QoS flow mapped to an SDT bearer; The total data size of all QoS flows mapped to one SDT bearer; Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold; The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

27. A data transmission device, applied to a core network device, characterized in that: include: A second determining unit is used to determine data transmission auxiliary information; wherein the data transmission auxiliary information includes: first indication information and at least one item of data size related information corresponding to the small data transmission SDT bearer, and the first indication information is used to indicate whether the core network device has cached non-SDT data; The third sending unit is used to send the data transmission auxiliary information to the wireless access network device.

28. The data transmission device according to claim 27, characterized in that: The data size related information includes at least one of the following: The data size of each QoS flow mapped to an SDT bearer; The total data size of all QoS flows mapped to one SDT bearer; Second indication information indicating that the data size of each QoS flow mapped to one SDT bearer is greater than or less than a first threshold; The third indication information indicates that the total data size of all QoS flows mapped to one SDT bearer is greater than or less than the second threshold.

29. A non-transitory readable storage medium, characterized in that: The non-transitory readable storage medium stores a computer program, and the computer program is used to enable a processor to execute the method according to any one of claims 1 to 12.

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