Data transmission method, device and equipment

Abstract

The invention provides a data transmission method, device and equipment, and the method comprises the steps: receiving downlink data size related information transmitted by core network equipment; determining whether to initiate downlink small data transmission (MT-SDT) paging according to the downlink data volume related information; wherein the downlink data volume related information corresponds to downlink data cached by the core network equipment. 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] Receiving downlink data volume related information sent by a core network device; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0007] According to the downlink data volume related information, it is determined whether to initiate downlink small data transmission MT-SDT paging.

[0008] Optionally, the downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0009] Optionally, the at least one quality of service QoS flow includes: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0; or,

[0010] The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

[0011] Optionally, determining whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information includes:

[0012] According to the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, determine whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and the buffered data is less than the SDT threshold;

[0013] When there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold, it is determined to initiate MT-SDT paging.

[0014] Optionally, before receiving the downlink data volume related information sent by the core network device, the method further includes:

[0015] Sending a first request to the core network device, where the first request is used to request the core network device to cache data and to feed back information related to the downlink data volume;

[0016] The receiving core network device sends downlink data volume related information, including:

[0017] Receive downlink data volume related information sent by the core network device according to the first request.

[0018] The embodiment of the present application also provides a data transmission method, which is applied to a core network device, including:

[0019] Determine downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0020] Send the downlink data volume related information to the wireless access network device.

[0021] Optionally, the downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0022] Optionally, the at least one quality of service QoS flow includes: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0; or,

[0023] The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

[0024] Optionally, before determining the information related to the amount of downlink data, the method further includes:

[0025] receiving a first request sent by the wireless access network device, where the first request is used to request the core network device to cache data and to feed back information related to the amount of downlink data;

[0026] The determining of the downlink data volume related information includes:

[0027] Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

[0028] 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:

[0029] 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:

[0030] Receiving, by the transceiver, information related to the amount of downlink data sent by a core network device; wherein the information related to the amount of downlink data corresponds to the downlink data buffered by the core network device;

[0031] According to the downlink data volume related information, it is determined whether to initiate downlink small data transmission MT-SDT paging.

[0032] Optionally, the downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume cached on each QoS flow.

[0033] Optionally, the at least one quality of service QoS flow includes: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0; or,

[0034] The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

[0035] Optionally, determining whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information includes:

[0036] According to the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, determine whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and the buffered data is less than the SDT threshold;

[0037] When there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold, it is determined to initiate MT-SDT paging.

[0038] Optionally, the operation further includes:

[0039] Before receiving the downlink data volume related information sent by the core network device, sending a first request to the core network device through the transceiver, wherein the first request is used to request the core network device to cache data and feed back the downlink data volume related information;

[0040] The receiving core network device sends downlink data volume related information, including:

[0041] Receive downlink data volume related information sent by the core network device according to the first request.

[0042] 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:

[0043] 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:

[0044] Determine downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0045] The downlink data volume related information is sent to a wireless access network device through the transceiver.

[0046] Optionally, the downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume cached on each QoS flow.

[0047] Optionally, the at least one quality of service QoS flow includes: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0; or,

[0048] The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

[0049] Optionally, the operation further includes:

[0050] Before determining the information related to the amount of downlink data, receiving, by the transceiver, a first request sent by the wireless access network device, wherein the first request is used to request the core network device to cache data and to feed back the information related to the amount of downlink data;

[0051] The determining of the downlink data volume related information includes:

[0052] Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

[0053] The embodiment of the present application further provides a data transmission device, which is applied to a wireless access network device, including:

[0054] A first receiving unit, configured to receive downlink data volume related information sent by a core network device; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0055] The first determining unit is configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information.

[0056] Optionally, the downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0057] Optionally, the at least one quality of service QoS flow includes: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0; or,

[0058] The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

[0059] Optionally, determining whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information includes:

[0060] According to the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, determine whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and the buffered data is less than the SDT threshold;

[0061] When there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold, it is determined to initiate MT-SDT paging.

[0062] Optionally, also include:

[0063] A first sending unit, configured to send a first request to the core network device before receiving information related to the amount of downlink data sent by the core network device, wherein the first request is used to request the core network device to cache data and feed back information related to the amount of downlink data;

[0064] The receiving core network device sends downlink data volume related information, including:

[0065] Receive downlink data volume related information sent by the core network device according to the first request.

[0066] The embodiment of the present application also provides a data transmission device, which is applied to a core network device, including:

[0067] A second determining unit is used to determine information related to the amount of downlink data; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device;

[0068] The second sending unit is used to send the downlink data volume related information to the wireless access network device.

[0069] Optionally, the downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0070] Optionally, the at least one quality of service QoS flow includes: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0; or,

[0071] The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

[0072] Optionally, also include:

[0073] A second receiving unit is configured to receive a first request sent by the wireless access network device before determining the information related to the amount of downlink data, wherein the first request is used to request the core network device to cache data and to feed back the information related to the amount of downlink data;

[0074] The determining of the downlink data volume related information includes:

[0075] Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

[0076] 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.

[0077] The beneficial effects of the above technical solution of the present application are as follows:

[0078] In the above scheme, the data transmission method receives information related to the amount of downlink data sent by the core network device; wherein, the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; based on the information related to the amount of downlink data, it is determined whether to initiate downlink small data transmission MT-SDT paging; it can support accurate SDT, and well solve the problem of inability to accurately perform SDT in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 A schematic diagram of the wireless communication system architecture of an embodiment of the present application;

[0080] Figure 2 A schematic diagram of a radio resource control state transition according to an embodiment of the present application;

[0081] Figure 3 This is a schematic diagram of core network cache data in an embodiment of the present application;

[0082] Figure 4 This is a schematic diagram of a core network cache data notification according to an embodiment of the present application;

[0083] Figure 5 The data transmission method of the present invention is shown in the following figure. Figure 1 ;

[0084] Figure 6 The data transmission method of the present invention is shown in the following figure. Figure 2 ;

[0085] Figure 7 The data transmission device structure of the embodiment of the present application is shown in FIG. Figure 1 ;

[0086] Figure 8 The data transmission device structure of the embodiment of the present application is shown in FIG. Figure 2 ;

[0087] Fig. 9 The structure of the data transmission device of the embodiment of the present application is shown as follows: Figure 1 ;

[0088] Fig.10 The structure of the data transmission device of the embodiment of the present application is shown as follows: Figure 2 . DETAILED DESCRIPTION

[0089] 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.

[0090] 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.

[0091] In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] The following first introduces the contents involved in the solution provided in the embodiment of the present application.

[0098] (1) Definition and characteristics of the Inactive state;

[0099] 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.

[0100] 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.

[0101] The relationship between the above three radio resource control (RRC) states can be as follows: Figure 2 shown.

[0102] (2) Enhanced Discontinuous Reception (eDRX) in inactive mode;

[0103] 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.

[0104] 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.

[0105] 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.

[0106] (3) MT-SDT (Mobile Terminated Small Data Transmission);

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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:

[0111] Step 51: receiving downlink data volume related information sent by a core network device; wherein the downlink data volume related information corresponds to the downlink data buffered by the core network device;

[0112] Step 52: Determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information.

[0113] The data transmission method provided in the embodiment of the present application receives information related to the amount of downlink data sent by a core network device; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; determines whether to initiate downlink small data transmission MT-SDT paging based on the information related to the amount of downlink data; and can support accurate SDT, which well solves the problem of inability to accurately perform SDT in the prior art.

[0114] The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0115] This can support the wireless access network device to more accurately determine whether to initiate MT-SDT paging.

[0116] In an embodiment of the present application, the at least one quality of service QoS flow includes: a first QoS flow with uncached data, and the downlink data volume of the first QoS flow is set to 0; or, the at least one quality of service QoS flow does not include a QoS flow with uncached data. It can be understood here that: the downlink data volume related information includes all QoS flows with cached data on the core network side, and the amount of data cached on each flow (excluding QoS flows without cached data); or, the downlink data volume related information includes all QoS flows corresponding to the UE, and the data volume on each flow (the mark without cached data is 0); but it is not limited to this.

[0117] This can support flexible implementation of this solution.

[0118] Among them, determining whether to initiate downlink small data transmission MT-SDT paging according to the information related to the downlink data volume includes: determining whether there is cached data only on the QoS flow corresponding to the SDT bearer and the information related to the downlink data volume, and the cached data is less than the SDT threshold; if there is cached data only on the QoS flow corresponding to the SDT bearer and the cached data is less than the SDT threshold, determining to initiate MT-SDT paging.

[0119] In this way, it is possible to accurately determine whether to initiate MT-SDT paging. Among them, "determine whether there is cached data only on the QoS flow corresponding to the SDT bearer and the cached data is less than the SDT threshold according to the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information", may include: determining whether the cached data indicated by the core network belongs to the SDT bearer according to the mapping relationship between the SDT bearer and the QoS flow; and determining whether there is cached data only on the QoS flow corresponding to the SDT bearer in combination with the downlink data volume related information, and whether the cached data of the SDT bearer is less than the SDT threshold; but it is not limited to this.

[0120] Furthermore, before receiving the information related to the downlink data volume sent by the core network device, it also includes: sending a first request to the core network device, the first request being used to request the core network device to cache data and to feedback the information related to the downlink data volume; receiving the information related to the downlink data volume sent by the core network device includes: receiving the information related to the downlink data volume sent by the core network device according to the first request.

[0121] This can support the wireless access network device to actively obtain the information related to the downlink data volume.

[0122] The present application also provides a data transmission method, which is applied to a core network device, such as Figure 6 As shown, including:

[0123] Step 61: Determine downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0124] Step 62: Send the downlink data volume related information to the wireless access network device.

[0125] The data transmission method provided in the embodiment of the present application determines information related to the amount of downlink data; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; sends the information related to the amount of downlink data to the wireless access network device; and 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.

[0126] The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0127] This can support the wireless access network device to more accurately determine whether to initiate MT-SDT paging.

[0128] In an embodiment of the present application, the at least one quality of service QoS flow includes: a first QoS flow with uncached data, and the downlink data volume of the first QoS flow is set to 0; or, the at least one quality of service QoS flow does not include a QoS flow with uncached data. It can be understood here that: the downlink data volume related information includes all QoS flows with cached data on the core network side, and the amount of data cached on each flow (excluding QoS flows without cached data); or, the downlink data volume related information includes all QoS flows corresponding to the UE, and the data volume on each flow (the mark without cached data is 0); but it is not limited to this.

[0129] This can support flexible implementation of this solution.

[0130] Furthermore, before determining the information related to the downlink data volume, it also includes: receiving a first request sent by the wireless access network device, the first request being used to request the core network device to cache data and to feed back the information related to the downlink data volume; determining the information related to the downlink data volume includes: caching the downlink data according to the first request, and determining the corresponding information related to the downlink data volume.

[0131] This can support the wireless access network device to actively obtain the information related to the downlink data volume.

[0132] 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.

[0133] 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 core network-assisted downlink data transmission method, 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).

[0134] This plan mainly involves the following contents:

[0135] (1) The core network indicates the data size of downlink data of each QoS flow of the UE in the core network buffer in the NGAP DL DATA NOTIFICATION message; corresponding to the sending of the downlink data size related information to the wireless access network device; the downlink data size related information includes: identification information of at least one quality of service QoS flow and the downlink data size buffered on each QoS flow;

[0136] (2) The base station initiates paging. For the UE in the Inactive state configured with SDT, the base station determines whether to indicate MT-SDT in the paging message of the air interface according to the information provided by the core network (corresponding to the above-mentioned determination of whether to initiate MT-SDT paging for downlink small data transmission according to the relevant information of the downlink data volume). The base station can determine whether there is buffered data only on the SDT bearer and the total amount of data buffered on the SDT bearer according to the information provided by the core network and the mapping relationship between QoS flow and DRB (Data Radio Bearer), and then decide whether to initiate MT-SDT paging; corresponding to the above-mentioned determination of whether there is buffered data only on the QoS flow corresponding to the SDT bearer according to the mapping relationship between the SDT bearer and the QoS flow and the relevant information of the downlink data volume, and the buffered data is less than the SDT threshold; in the case where there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold, it is determined to initiate MT-SDT paging.

[0137] Optionally, the base station may request and / or indicate to the core network that the core network needs to send the datasize per QoS flow; corresponding to the above-mentioned sending of a first request to the core network device, the first request is used to request the core network device to cache data and feedback information related to the downlink data volume; and receiving information related to the downlink data volume sent by the core network device according to the first request.

[0138] The following is a specific example of this solution.

[0139] Example 1: The base station requests and / or instructs the core network to buffer DL data, and the core network buffers non-SDT data;

[0140] 1. The base station releases the UE supporting SDT to the RRC inactive state, with SDT configured and the eDRX cycle greater than 10.24s.

[0141] 2. The base station sends an NGAP MT COMMUNICATION HANDLING REQUEST (corresponding to the first request) to the core network, requesting the core network to buffer data, and indicating the core network to provide the amount of DL data buffered on each QoS flow.

[0142] 3. Some downlink data is buffered on some QoS flows (quality of service flows) in the core network. The core network sends NGAP DL DATA NOTIFICATION to the base station, which can carry the amount of data in the core network buffer on each QoS flow (corresponding to the above-mentioned downlink data amount related information).

[0143] 4. The base station determines, based on the data size information provided by the core network (QoS flow list (corresponding to the identification information of the above-mentioned QoS flow), and the amount of buffered data on each QoS flow (corresponding to the above-mentioned downlink data amount)), and the QoS flow-DRB mapping (matching, corresponding to the above-mentioned mapping relationship) in the UE context, whether there is buffered data on the non-SDT bearer (there is data only on the non-SDT bearer, or there is data on both the non-SDT bearer and the SDT bearer), or there is data only on the SDT bearer, but the data amount is greater than the threshold of SDT transmission (corresponding to the above-mentioned SDT threshold).

[0144] 5. The base station initiates RAN paging, and after successfully paging the UE, restores the UE to the RRC connected state.

[0145] 6. The base station receives the cached data sent by the core network and sends it to the UE in the RRC connected state.

[0146] Example 2: The base station requests and / or instructs the core network to buffer DL data, and the core network buffers only SDT data;

[0147] 1. The base station releases the UE supporting SDT to the RRC inactive state, with SDT configured and the eDRX cycle greater than 10.24s.

[0148] 2. The base station sends an NGAP MT COMMUNICATION HANDLING REQUEST (corresponding to the first request) to the core network, requesting the core network to buffer data, and indicating the core network to provide the amount of DL data buffered on each QoS flow.

[0149] 3. Some downlink data is buffered on some QoS flows in the core network. The core network sends NGAP DL DATANOTIFICATION to the base station, which can carry the amount of data on each QoS flow in the core network buffer (corresponding to the above downlink data amount related information).

[0150] 4. The base station determines that the buffered data is all on the SDT bearer and the total amount of data does not exceed the threshold of DL SDT transmission (corresponding to the above-mentioned buffered data being less than the SDT threshold) based on the data size information provided by the core network (QoS flow list (corresponding to the identification information of the above-mentioned QoS flow), and the amount of cached data on each QoS flow (corresponding to the above-mentioned downlink data amount)), combined with the QoS flow-DRB mapping in the UE context (matching, corresponding to the above-mentioned mapping relationship).

[0151] 5. The base station initiates RAN paging to indicate MT-SDT (corresponding to the above-mentioned determination to initiate MT-SDT paging when there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold).

[0152] 6. The base station receives the cached data sent by the core network, the UE successfully responds to the paging, and the base station completes the transmission of the DL SDT data in the Inactive state (i.e., transmission to the UE).

[0153] Example 3: The core network provides buffer data on its own, without request and / or instruction from the base station;

[0154] The overall process is similar to Example 1 or 2, except that the base station does not need to provide clear request or indication information when requesting data buffer. The core network normally caches DL data and tells the base station the data buffer status of each QoS flow when notifying the base station to perform paging. The base station behaves the same as Example 1 or 2. For example, the following case 1 or case 2:

[0155] Case 1: The core network caches non-SDT data;

[0156] 1. The base station releases the UE supporting SDT to the RRC inactive state, with SDT configured and the eDRX cycle greater than 10.24s.

[0157] 2. Some downlink data is buffered on some QoS flows (quality of service flows) in the core network. The core network sends NGAP DL DATA NOTIFICATION to the base station, which can carry the amount of data in the core network buffer on each QoS flow (corresponding to the above-mentioned downlink data amount related information).

[0158] 3. The base station determines, based on the data size information provided by the core network (QoS flow list (corresponding to the identification information of the above-mentioned QoS flow), and the amount of buffered data on each QoS flow (corresponding to the above-mentioned downlink data amount)), and the QoS flow-DRB mapping (matching, corresponding to the above-mentioned mapping relationship) in the UE context, whether there is buffered data on the non-SDT bearer (there is data only on the non-SDT bearer, or there is data on both the non-SDT bearer and the SDT bearer), or whether there is data only on the SDT bearer, but the data amount is greater than the threshold of SDT transmission (corresponding to the above-mentioned SDT threshold).

[0159] 4. The base station initiates RAN paging, and after successfully paging the UE, restores the UE to the RRC connected state.

[0160] 5. The base station receives the cached data sent by the core network and sends it to the UE in the RRC connected state.

[0161] Case 2: The core network caches only SDT data;

[0162] 1. The base station releases the UE supporting SDT to the RRC inactive state, with SDT configured and the eDRX cycle greater than 10.24s.

[0163] 2. Some downlink data is buffered on some QoS flows in the core network. The core network sends NGAP DL DATANOTIFICATION to the base station, which can carry the amount of data on each QoS flow in the core network buffer (corresponding to the above downlink data amount related information).

[0164] 3. The base station determines that the buffered data is all on the SDT bearer and the total amount of data does not exceed the threshold of DL SDT transmission (corresponding to the above-mentioned buffered data being less than the SDT threshold) based on the data size information provided by the core network (QoS flow list (corresponding to the identification information of the above-mentioned QoS flow), and the amount of cached data on each QoS flow (corresponding to the above-mentioned downlink data amount)), combined with the QoS flow-DRB mapping in the UE context (matching, corresponding to the above-mentioned mapping relationship).

[0165] 4. The base station initiates RAN paging to indicate MT-SDT (corresponding to the above-mentioned determination to initiate MT-SDT paging when there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold).

[0166] 5. The base station receives the cached data sent by the core network, the UE successfully responds to the paging, and the base station completes the transmission of the DL SDT data in the Inactive state (i.e., transmission to the UE).

[0167] Based on the above, the solution provided by the embodiment of the present application involves the following contents:

[0168] Base station side:

[0169] 1) The base station receives the cached DL data volume related information sent by the core network (corresponding to the above-mentioned receiving the downlink data volume related information sent by the core network device); based on the information, it determines whether the paging message of the air interface contains the MT-SDT indication (corresponding to the above-mentioned determination of whether to initiate downlink small data transmission MT-SDT paging based on the downlink data volume related information).

[0170] 2) As described in 1), the DL data volume related information is the QoS flow list (corresponding to the identification information of the above QoS flows) and the DL data volume cached on each QoS flow (corresponding to the downlink data volume cached on each QoS flow).

[0171] 3) According to 2), for a QoS flow without cached data, the data volume can be set to 0 (corresponding to the above-mentioned at least one quality of service QoS flow including: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0); or it may not be included in the above-mentioned QoS flow list (corresponding to the above-mentioned at least one quality of service QoS flow not including a QoS flow with uncached data).

[0172] 4) As described in 1), the base station determines whether the paging message of the air interface contains an MT-SDT indication, which may specifically include: the base station determines whether the cached data indicated by the core network belongs to the SDT bearer based on the mapping relationship between the SDT bearer and the QoS flow, and determines whether only the QoS flow corresponding to the SDT bearer has cached data in combination with the cached data volume information provided by the core network, and whether the cached data of the SDT bearer exceeds the threshold of DL SDT transmission (corresponding to the above-mentioned determination of whether there is cached data only on the QoS flow corresponding to the SDT bearer according to the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, and the cached data is less than the SDT threshold). Among them, it is possible to: initiate MT-SDT paging only when there is cached data only on the QoS flow corresponding to the SDT bearer, and the total amount of data does not exceed the threshold of DL SDT transmission (corresponding to the above-mentioned determination of initiating MT-SDT paging when there is cached data only on the QoS flow corresponding to the SDT bearer, and the cached data is less than the SDT threshold).

[0173] 5) Before 1), the method may also include, when the base station requests buffer data from the core network, simultaneously requesting and / or indicating that the core network needs to send the data size per QoS flow (corresponding to the above-mentioned first request sent to the core network device, the first request is used to request the core network device to cache data and feedback information related to the downlink data volume).

[0174] Core network side:

[0175] 1) The core network determines information related to the DL data volume of the buffer, and provides information related to the DL data volume of the buffer to the base station (corresponding to the above-mentioned determination of information related to the downlink data volume; sending the downlink data volume information to the radio access network device).

[0176] 2) Before 1), the method may also include the core network receiving buffer request information from the base station, wherein the buffer request information requests and / or instructs the core network to provide the data volume of the buffer on each QoS flow of the UE (corresponding to the above-mentioned reception of the first request sent by the wireless access network device, wherein the first request is used to request the core network device to cache data and to feedback information related to the downlink data volume).

[0177] 3) As described in 1), the information related to the DL data volume of the buffer provided by the core network includes: a QoS flow list (corresponding to the identification information of the above QoS flows) and the DL data volume cached on each QoS flow (corresponding to the downlink data volume cached on each QoS flow).

[0178] 4) According to 3), for the QoS flow without cached data, the data volume can be set to 0 (corresponding to the above-mentioned at least one quality of service QoS flow including: a first QoS flow without cached data, and the downlink data volume of the first QoS flow is set to 0); it may also not be included in the above-mentioned QoS flow list (corresponding to the above-mentioned at least one quality of service QoS flow not including a QoS flow with uncached data).

[0179] From the above, this solution introduces a core network-assisted downlink data transmission method; 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 sends the cached data. Among them, for terminals that support and configure MT-SDT, the base station can determine whether to initiate MT-SDT paging and the corresponding MT-SDT data transmission process based on the QoS flow of the data buffered by the core network and the amount of data; in the case of only DL SDT data transmission, the UE's RRC connection state may not be restored, and the UE's DL data transmission can be completed in the Inactive state; this is more efficient and avoids the problem that the base station cannot determine how to page or whether to restore the air interface due to the base station's lack of knowledge of the current cached data, making data transmission more efficient.

[0180] 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:

[0181] 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:

[0182] Receiving, through the transceiver 72, information related to the amount of downlink data sent by the core network device; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device;

[0183] According to the downlink data volume related information, it is determined whether to initiate downlink small data transmission MT-SDT paging.

[0184] The data transmission device provided in the embodiment of the present application receives information related to the amount of downlink data sent by a core network device; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; determines whether to initiate downlink small data transmission MT-SDT paging based on the information related to the amount of downlink data; and can support accurate SDT, which is a good solution to the problem of inability to accurately perform SDT in the prior art.

[0185] Specifically, the transceiver 72 is used to receive and send data under the control of the processor 73.

[0186] 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.

[0187] 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.

[0188] The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0189] In an embodiment of the present application, the at least one quality of service QoS flow includes: a first QoS flow of uncached data, and the downlink data volume of the first QoS flow is set to 0; or, the at least one quality of service QoS flow does not include a QoS flow of uncached data.

[0190] Among them, determining whether to initiate downlink small data transmission MT-SDT paging according to the information related to the downlink data volume includes: determining whether there is cached data only on the QoS flow corresponding to the SDT bearer and the information related to the downlink data volume, and the cached data is less than the SDT threshold; if there is cached data only on the QoS flow corresponding to the SDT bearer and the cached data is less than the SDT threshold, determining to initiate MT-SDT paging.

[0191] Furthermore, the operation also includes: before receiving the information related to the downlink data volume sent by the core network device, sending a first request to the core network device through the transceiver, the first request being used to request the core network device to cache data and to feedback the information related to the downlink data volume; receiving the information related to the downlink data volume sent by the core network device includes: receiving the information related to the downlink data volume sent by the core network device according to the first request.

[0192] 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.

[0193] 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:

[0194] 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:

[0195] Determine downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0196] The downlink data volume related information is sent to the wireless access network device through the transceiver 82.

[0197] The data transmission device provided in the embodiment of the present application determines information related to the amount of downlink data; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; sends the information related to the amount of downlink data to the wireless access network device; and 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.

[0198] Specifically, the transceiver 82 is used to receive and send data under the control of the processor 83.

[0199] Among them, Figure 8In 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.

[0200] 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.

[0201] The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0202] In an embodiment of the present application, the at least one quality of service QoS flow includes: a first QoS flow of uncached data, and the downlink data volume of the first QoS flow is set to 0; or, the at least one quality of service QoS flow does not include a QoS flow of uncached data.

[0203] Furthermore, the operation also includes: before determining the information related to the downlink data volume, receiving a first request sent by the wireless access network device through the transceiver, the first request being used to request the core network device to cache data and to feed back the information related to the downlink data volume; determining the information related to the downlink data volume includes: caching the downlink data according to the first request, and determining the corresponding information related to the downlink data volume.

[0204] 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.

[0205] 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:

[0206] The first receiving unit 91 is configured to receive downlink data volume related information sent by a core network device; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0207] The first determining unit 92 is configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information.

[0208] The data transmission device provided in the embodiment of the present application receives information related to the amount of downlink data sent by a core network device; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; determines whether to initiate downlink small data transmission MT-SDT paging based on the information related to the amount of downlink data; and can support accurate SDT, which is a good solution to the problem of inability to accurately perform SDT in the prior art.

[0209] The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0210] In an embodiment of the present application, the at least one quality of service QoS flow includes: a first QoS flow of uncached data, and the downlink data volume of the first QoS flow is set to 0; or, the at least one quality of service QoS flow does not include a QoS flow of uncached data.

[0211] Among them, determining whether to initiate downlink small data transmission MT-SDT paging according to the information related to the downlink data volume includes: determining whether there is cached data only on the QoS flow corresponding to the SDT bearer and the information related to the downlink data volume, and the cached data is less than the SDT threshold; if there is cached data only on the QoS flow corresponding to the SDT bearer and the cached data is less than the SDT threshold, determining to initiate MT-SDT paging.

[0212] Furthermore, the data transmission device also includes: a first sending unit, used to send a first request to the core network device before receiving the information related to the downlink data volume sent by the core network device, the first request being used to request the core network device to cache data and to feedback the information related to the downlink data volume; the receiving information related to the downlink data volume sent by the core network device includes: receiving the information related to the downlink data volume sent by the core network device according to the first request.

[0213] 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.

[0214] The present application also provides a data transmission device, which is applied to a core network device, such as Fig.10 As shown, including:

[0215] The second determining unit 101 is configured to determine information related to the amount of downlink data; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device;

[0216] The second sending unit 102 is configured to send the downlink data volume related information to the wireless access network device.

[0217] The data transmission device provided in the embodiment of the present application determines information related to the amount of downlink data; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; sends the information related to the amount of downlink data to the wireless access network device; and 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.

[0218] The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

[0219] In an embodiment of the present application, the at least one quality of service QoS flow includes: a first QoS flow of uncached data, and the downlink data volume of the first QoS flow is set to 0; or, the at least one quality of service QoS flow does not include a QoS flow of uncached data.

[0220] Furthermore, the data transmission device also includes: a second receiving unit, used to receive a first request sent by the wireless access network device before determining the information related to the downlink data volume, the first request being used to request the core network device to cache data and to feedback the information related to the downlink data volume; determining the information related to the downlink data volume includes: caching the downlink data according to the first request, and determining the corresponding information related to the downlink data volume.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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: Receiving downlink data volume related information sent by a core network device; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device; According to the downlink data volume related information, it is determined whether to initiate downlink small data transmission MT-SDT paging.

2. The data transmission method according to claim 1, characterized in that: The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

3. The data transmission method according to claim 2, characterized in that: The at least one quality of service QoS flow includes: a first QoS flow without buffered data, and the downlink data volume of the first QoS flow is set to 0; or, The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

4. The data transmission method according to claim 1, characterized in that: The determining whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information includes: According to the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, determine whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and the buffered data is less than the SDT threshold; When there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold, it is determined to initiate MT-SDT paging.

5. The data transmission method according to claim 4, characterized in that: Before receiving the downlink data volume related information sent by the core network device, it also includes: Sending a first request to the core network device, where the first request is used to request the core network device to cache data and to feed back information related to the downlink data volume; The receiving core network device sends downlink data volume related information, including: Receive downlink data volume related information sent by the core network device according to the first request.

6. A data transmission method, applied to a core network device, characterized in that: include: Determine downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device; Send the downlink data volume related information to the wireless access network device.

7. The data transmission method according to claim 6, characterized in that: The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

8. The data transmission method according to claim 7, characterized in that: The at least one quality of service QoS flow includes: a first QoS flow without buffered data, and the downlink data volume of the first QoS flow is set to 0; or, The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

9. The data transmission method according to claim 6, characterized in that: Before determining the downlink data volume related information, it also includes: receiving a first request sent by the wireless access network device, where the first request is used to request the core network device to cache data and to feed back information related to the downlink data volume; The determining of the downlink data volume related information includes: Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

10. 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, through the transceiver, information related to the amount of downlink data sent by a core network device; wherein the information related to the amount of downlink data corresponds to the downlink data buffered by the core network device; According to the downlink data volume related information, it is determined whether to initiate downlink small data transmission MT-SDT paging.

11. The data transmission device according to claim 10, characterized in that: The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

12. The data transmission device according to claim 11, characterized in that: The at least one quality of service QoS flow includes: a first QoS flow without buffered data, and the downlink data volume of the first QoS flow is set to 0; or, The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

13. The data transmission device according to claim 10, characterized in that: The determining whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information includes: According to the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, determine whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and the buffered data is less than the SDT threshold; When there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold, it is determined to initiate MT-SDT paging.

14. The data transmission device according to claim 13, characterized in that: The operations also include: Before receiving the downlink data volume related information sent by the core network device, sending a first request to the core network device through the transceiver, wherein the first request is used to request the core network device to cache data and feed back the downlink data volume related information; The receiving core network device sends downlink data volume related information, including: Receive downlink data volume related information sent by the core network device according to the first request.

15. 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; and a processor for reading the computer program in the memory and performing the following operations: Determine downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device; The downlink data volume related information is sent to a wireless access network device through the transceiver.

16. The data transmission device according to claim 15, characterized in that: The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

17. The data transmission device according to claim 16, characterized in that: The at least one quality of service QoS flow includes: a first QoS flow without buffered data, and the downlink data volume of the first QoS flow is set to 0; or, The at least one quality of service QoS flow does not include a QoS flow for unbuffered data.

18. The data transmission device according to claim 15, characterized in that: The operations also include: Before determining the information related to the amount of downlink data, receiving, by the transceiver, a first request sent by the wireless access network device, wherein the first request is used to request the core network device to cache data and to feed back the information related to the amount of downlink data; The determining of the downlink data volume related information includes: Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

19. A data transmission device, applied to a wireless access network device, characterized in that: include: A first receiving unit, configured to receive downlink data volume related information sent by a core network device; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device; The first determining unit is configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information.

20. The data transmission device according to claim 19, characterized in that: The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

21. A data transmission device, applied to a core network device, characterized in that: include: A second determining unit is used to determine information related to the amount of downlink data; wherein the information related to the amount of downlink data corresponds to the downlink data cached by the core network device; The second sending unit is used to send the downlink data volume related information to the wireless access network device.

22. The data transmission device according to claim 21, characterized in that: The downlink data volume related information includes: identification information of at least one quality of service QoS flow and the downlink data volume buffered on each QoS flow.

23. 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 9.

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