Data transmission method and apparatus, and device

Abstract

The present disclosure relates to the technical field of communications. Disclosed are a data transmission method and apparatus, and a device. The data transmission method comprises: receiving downlink data amount-related information sent by a core network device; and according to the downlink data amount-related information, determining whether to initiate downlink mobile terminated small data transmission (MT-SDT) paging, wherein the downlink data amount-related information corresponds to downlink data cached by the core network device.

Description

Data transmission method, device and equipment

[0001] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on July 25, 2023, with application number 202310918153.3 and application name “A Data Transmission Method, Device and Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of communication technology, and in particular to a data transmission method, apparatus, and device. Background Art

[0003] Currently, for user equipment (UE) supporting enhanced discontinuous reception (eDRX) for longer 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 deems the UE reachable, it can send a NR Application Protocol (NGAP) DL DATA NOTIFICATION message to the Next Generation Radio Access Network (NG-RAN). The NG-RAN triggers paging, allowing the UE to transition from the inactive state to the connected state to receive data buffered by the core network. However, in scenarios involving mobile terminated small data transmission (MT-SDT) (network-initiated small data transmission, mobile-terminated small data transmission, or downlink small data transmission), an inactive UE configured with eDRX can transmit data without entering the connected state. The solution for small data transmission in this scenario remains unresolved.

[0004] As described above, in the related 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 small data transmission (SDT) cannot be accurately performed.

[0005] Summary of the Invention

[0006] The present disclosure aims to provide a data transmission method, apparatus and device to solve the problem in the related art that SDT cannot be accurately performed.

[0007] In order to solve the above technical problems, an embodiment of the present disclosure provides a data transmission method applied to a wireless access network device, including:

[0008] 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;

[0009] Determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data amount related information.

[0010] In some embodiments, 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.

[0011] In some embodiments, the at least one quality of service (QoS) flow includes: a first QoS flow with no buffered data, and a downlink data volume of the first QoS flow is set to 0; or

[0012] The at least one quality of service (QoS) flow does not include a QoS flow for unbuffered data.

[0013] In some embodiments, determining whether to initiate downlink small data transmission MT-SDT paging based on the downlink data volume related information includes:

[0014] Determine, based on the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and whether the buffered data is less than the SDT threshold;

[0015] 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.

[0016] In some embodiments, before receiving the downlink data volume related information sent by the core network device, the method further includes:

[0017] 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 feedback information related to the downlink data volume;

[0018] The receiving information related to the amount of downlink data sent by the core network device includes:

[0019] Receive downlink data volume related information sent by the core network device according to the first request.

[0020] The present disclosure also provides a data transmission method, which is applied to a core network device and includes:

[0021] Determining downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0022] Send the downlink data volume related information to the wireless access network device.

[0023] In some embodiments, 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.

[0024] In some embodiments, the at least one quality of service (QoS) flow includes: a first QoS flow with no buffered data, and a downlink data volume of the first QoS flow is set to 0; or

[0025] The at least one quality of service (QoS) flow does not include a QoS flow for unbuffered data.

[0026] In some embodiments, before determining the downlink data amount related information, the method further includes:

[0027] receiving a first request sent by the radio 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;

[0028] The determining of downlink data volume related information includes:

[0029] Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

[0030] The embodiment of the present disclosure further provides a data transmission device, which is a wireless access network device and includes a memory, a transceiver, and a processor:

[0031] 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:

[0032] Receiving, via 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;

[0033] Determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data amount related information.

[0034] In some embodiments, 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.

[0035] In some embodiments, the at least one quality of service (QoS) flow includes: a first QoS flow with no buffered data, and a downlink data volume of the first QoS flow is set to 0; or

[0036] The at least one quality of service (QoS) flow does not include a QoS flow for unbuffered data.

[0037] In some embodiments, determining whether to initiate downlink small data transmission MT-SDT paging based on the downlink data volume related information includes:

[0038] Determine, based on the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and whether the buffered data is less than the SDT threshold;

[0039] 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.

[0040] In some embodiments, the operations further include:

[0041] 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;

[0042] The receiving information related to the amount of downlink data sent by the core network device includes:

[0043] Receive downlink data volume related information sent by the core network device according to the first request.

[0044] The present disclosure also provides a data transmission device, which is a core network device and includes a memory, a transceiver, and a processor.

[0045] 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:

[0046] Determining downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0047] The downlink data volume related information is sent to a wireless access network device through the transceiver.

[0048] In some embodiments, 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.

[0049] In some embodiments, the at least one quality of service (QoS) flow includes: a first QoS flow with no buffered data, and a downlink data volume of the first QoS flow is set to 0; or

[0050] The at least one quality of service (QoS) flow does not include a QoS flow for unbuffered data.

[0051] In some embodiments, the operations further include:

[0052] Before determining the downlink data volume related information, receiving, through the transceiver, a first request sent by the radio access network device, where the first request is used to request the core network device to cache data and feed back the downlink data volume related information;

[0053] The determining of downlink data volume related information includes:

[0054] Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

[0055] The present disclosure also provides a data transmission device, which is applied to a wireless access network device and includes:

[0056] A first receiving unit 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 buffered by the core network device;

[0057] The first determining unit is configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data amount related information.

[0058] In some embodiments, 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.

[0059] In some embodiments, the at least one quality of service (QoS) flow includes: a first QoS flow with no buffered data, and a downlink data volume of the first QoS flow is set to 0; or

[0060] The at least one quality of service (QoS) flow does not include a QoS flow for unbuffered data.

[0061] In some embodiments, determining whether to initiate downlink small data transmission MT-SDT paging based on the downlink data volume related information includes:

[0062] Determine, based on the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume related information, whether there is buffered data only on the QoS flow corresponding to the SDT bearer, and whether the buffered data is less than the SDT threshold;

[0063] 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.

[0064] In some embodiments, further comprising:

[0065] A first sending unit is 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;

[0066] The receiving information related to the amount of downlink data sent by the core network device includes:

[0067] Receive downlink data volume related information sent by the core network device according to the first request.

[0068] The present disclosure also provides a data transmission device, which is applied to a core network device and includes:

[0069] A second determining unit is configured to determine information related to a downlink data volume; wherein the information related to the downlink data volume corresponds to the downlink data cached by the core network device;

[0070] The second sending unit is configured to send the downlink data volume related information to the wireless access network device.

[0071] In some embodiments, 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.

[0072] In some embodiments, the at least one quality of service (QoS) flow includes: a first QoS flow with no buffered data, and a downlink data volume of the first QoS flow is set to 0; or

[0073] The at least one quality of service (QoS) flow does not include a QoS flow for unbuffered data.

[0074] In some embodiments, further comprising:

[0075] A second receiving unit is configured to receive a first request sent by the radio access network device before determining the information related to the downlink data volume, wherein the first request is used to request the core network device to cache data and feed back the information related to the downlink data volume;

[0076] The determining of downlink data volume related information includes:

[0077] Downlink data is cached according to the first request, and corresponding downlink data volume related information is determined.

[0078] An embodiment of the present disclosure further provides a readable storage medium storing a computer program, wherein the computer program is used to enable a processor to execute the above-mentioned method on the radio access network device side or the core network device side.

[0079] The beneficial effects of the above technical solution disclosed in the present invention are as follows:

[0080] In the above scheme, the data transmission method receives information related to the downlink data volume sent by the core network device; wherein, the information related to the downlink data volume corresponds to the downlink data cached by the core network device; based on the information related to the downlink data volume, 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 related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] FIG1 is a schematic diagram of a wireless communication system architecture according to an embodiment of the present disclosure;

[0082] FIG2 is a schematic diagram of radio resource control state transition according to an embodiment of the present disclosure;

[0083] FIG3 is a schematic diagram of core network cache data according to an embodiment of the present disclosure;

[0084] FIG4 is a schematic diagram of a core network cache data notification according to an embodiment of the present disclosure;

[0085] FIG5 is a flowchart of a data transmission method according to an embodiment of the present disclosure;

[0086] FIG6 is a second flow chart of a data transmission method according to an embodiment of the present disclosure;

[0087] FIG7 is a first structural diagram of a data transmission device according to an embodiment of the present disclosure;

[0088] FIG8 is a second structural diagram of a data transmission device according to an embodiment of the present disclosure;

[0089] FIG9 is a first structural diagram of a data transmission device according to an embodiment of the present disclosure;

[0090] FIG10 is a second structural diagram of the data transmission device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0091] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure and not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0092] In the embodiments of the present disclosure, the term "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0093] In the embodiments of the present disclosure, the term "plurality" refers to two or more than two, and other quantifiers are similar thereto.

[0094] It is explained here that the technical solutions provided by the embodiments of the present disclosure can be applicable to a variety of systems, especially 5G systems. For example, applicable systems may be global system of mobile communication (GSM) systems, code division multiple access (CDMA) systems, wideband code division multiple access (WCDMA) general packet radio service (GPRS) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, long term evolution advanced (LTE-A) systems, universal mobile telecommunication systems (UMTS), worldwide interoperability for microwave access (WiMAX) systems, 5G new air interface (NR) systems, etc. These various systems include terminal devices and network devices. The system may also include a core network part, such as an evolved packet system (EPS), a 5G system (5G System, 5GS), etc.

[0095] Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present disclosure may be applied. The wireless communication system includes a terminal device (also referred to as a terminal) and a network device.

[0096] The terminal device involved in the embodiments of the present disclosure may be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connection function, or other processing device 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 User Equipment (UE). A wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device may be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device. For example, it may be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges voice and / or data with a radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), 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, or a user device, but is not limited in the embodiments of the present disclosure.

[0097] The network device involved in the embodiments of the present disclosure may be a base station, which may include multiple cells providing services to terminals. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in an access network that communicates with a wireless terminal device through one or more sectors on an air interface, or may be named by another name. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, acting 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 disclosure may be a base transceiver station (BTS) in the Global System for Mobile communications (GSM) or code division multiple access (CDMA), a network device (NodeB) in wide-band code division multiple access (WCDMA), an evolutionary Node B (eNB or e-NodeB) in the long term evolution (LTE) system, a 5G base station (gNB) in the next generation system, a home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiments of the present disclosure. 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 geographically separated.

[0098] 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 two-dimensional MIMO (2D-MIMO), three-dimensional MIMO (3D-MIMO), full-dimensional MIMO (FD-MIMO), or massive MIMO. It can also use diversity transmission, precoding transmission, or beamforming transmission.

[0099] The following first introduces the contents involved in the solution provided by the embodiment of the present disclosure.

[0100] (1) Definition and characteristics of the inactive state;

[0101] In the Long Term Evolution (LTE) system, the access layer has only two states: Idle and Connected. In the 5G New Radio (NR) standardization research, in addition to retaining these two LTE states, a third state has been introduced: Inactive.

[0102] The Inactive state is characterized by the following characteristics: From the core network's perspective, the user equipment (UE) remains in the Non-Access Stratum (CM_Connected) state. Both the Radio Access Network (RAN) and the UE retain the UE's access stratum context; however, the UE's air interface resources are released, similar to the Idle state. In the Inactive state, the UE can reselect a cell and receive system information broadcasts and paging messages. Unlike the Idle state, the UE can quickly return to the Connected state in the Inactive state.

[0103] The relationship between the three radio resource control (RRC) states in terms of their mutual conversion is shown in FIG2 .

[0104] (2) Enhanced Discontinuous Reception (eDRX) in inactive mode;

[0105] Currently, inactive UEs support eDRX exceeding 10.24s, up to nearly 3 hours. The base station can instruct the core network to buffer data. Because an inactive UE experiencing eDRX exceeding 10.24s is considered unreachable for a long period (nearly 3 hours), the core network can store the UE's relevant data without sending it to the base station.

[0106] Specifically, as shown in Figure 3, the base station sends an NR application protocol (NG Application Protocol, NGAP) mobile interruption communication processing request or a mobile terminal termination communication processing request or a downlink communication processing request (MT COMMUNICATION HANDLING 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), send a new radio paging enhanced discontinuous reception cycle (NR Paging eDRX Cycle for RRC INACTIVE) in the radio resource control inactive state and / or a new radio paging time window (NR Paging Time Window for RRC_INACTIVE) in the radio resource control inactive state and / or a new radio paging time window start (NR PTW The base station sends an HLcom deactivation (Deactivate) indication to the core network, which can know when the UE is in an unreachable state, and then buffer the data and feedback the mobile terminal to terminate the communication processing response; when the base station believes that the core network does not need to buffer the data, for example, the base station executes MO-SDT (mobile terminal initiates small data transmission, or uplink small data transmission) or the UE recovers the connection state, the base station sends an HLcom deactivation (Deactivate) indication to the core network, which shows true (true), which means that the core network does not need to buffer the data.

[0107] When the core network buffers downlink user data, before the UE's paging cycle arrives, it triggers an NGAP DL DATA NOTIFICATION message, as shown in Figure 4. This message indicates to the base station that there is buffered data in the core network and requests that the base station initiate a RAN paging process. Under normal circumstances (non-Mobile Terminated Small Data Transmission (MT-SDT) or network-initiated small data transmission or downlink small data transmission), upon receiving the core network's DL DATA NOTIFICATION message, the base station triggers RAN paging, transitioning the inactive UE to a connected state and then sending downlink (DL) data to the UE.

[0108] (3) Mobile Terminated Small Data Transmission (MT-SDT);

[0109] In the normal Inactive state, the arrival of uplink (UL) or DL ​​data for a UE triggers a state transition from Inactive to Connected, allowing the UE to transmit data in the Connected state. MT-SDT is a method for transmitting small amounts of downlink data in the Inactive state. The UE can transmit DL data without returning to the RRC Connected state.

[0110] Currently, in MT-SDT in RRC Inactive state, during bearer context establishment or modification, the CU-CP (herein, the gNB-CU-CP, the control plane node of the gNB's centralized unit) requests the CU-UP (herein, the gNB-CU-UP, the user plane node of the gNB's centralized unit) to provide MT-SDT information. When the CU-UP detects DL data, it sends an E1AP DL DATA NOTIFICATION message to the CU-CP with MT-SDT information. Alternatively, when the CU-CP receives DL signaling, it triggers an F1 Paging message with MT-SDT information (such as an MT-SDT indication). The DU (herein, the gNB-DU, the distributed unit of the gNB) sends a paging message to the UE with an MT-SDT indication. The CU-CP decides whether to use MT-SDT.

[0111] Based on the foregoing, the embodiments of the present disclosure provide a data transmission method, apparatus, and device to address the problem of inaccurate SDT in the related art. The method, apparatus, and device are based on the same patent application concept. Since the principles of the method, apparatus, and device are similar, their implementation can refer to each other, and any repetitions will not be repeated.

[0112] The data transmission method provided in the embodiment of the present disclosure is applied to a wireless access network device, as shown in FIG5 , and includes:

[0113] Step 51: Receive 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;

[0114] Step 52: Determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data volume related information.

[0115] The data transmission method provided by the embodiment of the present disclosure 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 effectively solves the problem of inability to accurately perform SDT in related technologies.

[0116] 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.

[0117] This can enable the wireless access network device to more accurately determine whether to initiate MT-SDT paging.

[0118] In the embodiment of the present disclosure, the at least one quality of service QoS flow includes: a first QoS flow with no cached 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 no cached 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 data volume 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 of no cached data is 0); but it is not limited to this.

[0119] This allows for flexible implementation of this solution.

[0120] Among them, the determining whether to initiate downlink small data transmission MT-SDT paging based on the downlink data volume related information includes: determining whether there is cached data only on the QoS flow corresponding to the SDT bearer and the downlink data volume related information, 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.

[0121] This allows for accurate determination of whether to initiate MT-SDT paging. The phrase "determining, based on the mapping relationship between the SDT bearer and the QoS flow and the downlink data volume information, whether there is cached data only on the QoS flow corresponding to the SDT bearer, and whether the cached data is less than the SDT threshold" may include: determining, based on the mapping relationship between the SDT bearer and the QoS flow, whether the cached data indicated by the core network belongs to the SDT bearer; and, in combination with the downlink data volume information, determining whether there is cached data only on the QoS flow corresponding to the SDT bearer, and whether the cached data on the SDT bearer is less than the SDT threshold; but is not limited thereto.

[0122] Furthermore, 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, the first request being used to request the core network device to cache data and feedback the downlink data volume related information; the receiving downlink data volume related information sent by the core network device includes: receiving the downlink data volume related information sent by the core network device according to the first request.

[0123] This can support the wireless access network device to actively obtain the information related to the downlink data volume.

[0124] The present disclosure also provides a data transmission method, which is applied to a core network device, as shown in FIG6 , including:

[0125] Step 61: Determine downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data buffered by the core network device;

[0126] Step 62: Send the downlink data volume related information to the wireless access network device.

[0127] The data transmission method provided by the embodiment of the present disclosure 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 effectively solves the problem of inability to accurately perform SDT in related technologies.

[0128] 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.

[0129] This can enable the wireless access network device to more accurately determine whether to initiate MT-SDT paging.

[0130] In the embodiment of the present disclosure, the at least one quality of service QoS flow includes: a first QoS flow with no cached 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 no cached 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 data volume 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 of no cached data is 0); but it is not limited to this.

[0131] This allows for flexible implementation of this solution.

[0132] 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 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.

[0133] This can support the wireless access network device to actively obtain the information related to the downlink data volume.

[0134] The data transmission method provided in the embodiment of the present disclosure is described below with an example, taking a base station as an example of a wireless access network device.

[0135] In response to the above technical problems, the embodiments of the present disclosure provide 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 inactive user terminal (UE) with radio resource control (RRC) configured with enhanced discontinuous reception (eDRX).

[0136] This plan mainly involves the following contents:

[0137] (1) The core network indicates the data size of downlink data in the core network buffer for each QoS flow of the UE in the NGAP DL DATA NOTIFICATION message; corresponding to the above-mentioned sending of the downlink data size related information to the radio 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 for each QoS flow;

[0138] (2) The base station initiates paging. For an Inactive UE configured with SDT, the base station determines whether to indicate MT-SDT in the paging message of the air interface based on 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 based on 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 based on the information provided by the core network and the mapping relationship between the QoS flow and the 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 and the relevant information of the downlink data volume, based on the mapping relationship between the SDT bearer and the QoS flow and the relevant information of the downlink data volume; and determining to initiate MT-SDT paging if there is buffered data only on the QoS flow corresponding to the SDT bearer and the buffered data is less than the SDT threshold.

[0139] In some embodiments, the base station can request and / or indicate to the core network that the core network needs to send the data size of each (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 receive information related to the downlink data volume sent by the core network device according to the first request.

[0140] The following is a specific example of this solution.

[0141] Example 1: The base station requests and / or instructs the core network to buffer DL data, and the core network buffers non-SDT data;

[0142] 1. The base station releases the UE that supports SDT to the RRC inactive state, configures SDT, and has an eDRX cycle greater than 10.24s.

[0143] 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 amount of DL data that the core network needs to provide for buffering on each QoS flow.

[0144] 3. The core network buffers some downlink data for certain QoS flows. The core network sends an NGAP DL DATA NOTIFICATION message to the base station, which carries the amount of data in the core network buffer for each QoS flow (corresponding to the downlink data volume information mentioned above).

[0145] 4. The base station determines, based on the data size information provided by the core network (the 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-small data transmission (non-SDT) bearer (only the non-SDT bearer has data, or both the non-SDT bearer and the SDT bearer have data), or whether there is data only on the SDT bearer, but the data amount is greater than the SDT transmission threshold (corresponding to the above-mentioned SDT threshold).

[0146] 5. The base station initiates RAN paging. After successfully paging the UE, it restores the UE to the RRC connected state.

[0147] 6. The base station receives the buffered data sent by the core network and sends it to the UE in the RRC connected state.

[0148] Example 2: The base station requests and / or instructs the core network to buffer DL data, and the core network only buffers SDT data;

[0149] 1. The base station releases the UE that supports SDT to the RRC inactive state, configures SDT, and has an eDRX cycle greater than 10.24s.

[0150] 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 amount of DL data that the core network needs to provide for buffering on each QoS flow.

[0151] 3. Some downlink data is buffered on some QoS flows in the core network. The core network sends an NGAP DL DATA NOTIFICATION to the base station, which carries the amount of data in the core network buffer for each QoS flow (corresponding to the downlink data amount information mentioned above).

[0152] 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 DL SDT transmission threshold (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 buffered data on each QoS flow (corresponding to the above-mentioned downlink data amount)), combined with the QoS flow-DRB matching in the UE context (mapping, corresponding to the above-mentioned mapping relationship).

[0153] 5. The base station initiates RAN paging and indicates 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).

[0154] 6. The base station receives the buffered 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 (i.e., transmits it to the UE) in the Inactive state.

[0155] Example 3: The core network provides buffer data on its own, without the need for base station requests and / or instructions;

[0156] The overall process is similar to Example 1 or 2, except that the base station does not need to provide explicit request or indication information when requesting data buffer. The core network normally buffers DL data and informs the base station of the data buffer status of each QoS flow when notifying the base station to perform paging. The base station behaves the same as in Example 1 or 2. For example, in the following cases 1 or 2:

[0157] Case 1: The core network caches non-SDT data.

[0158] 1. The base station releases the UE that supports SDT to the RRC inactive state, configures SDT, and has an eDRX cycle greater than 10.24s.

[0159] 2. The core network buffers some downlink data for certain QoS flows. The core network sends an NGAP DL DATA NOTIFICATION message to the base station, which carries the amount of data in the core network buffer for each QoS flow (corresponding to the downlink data volume information mentioned above).

[0160] 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 (only the non-SDT bearer has data, or both the non-SDT bearer and the SDT bearer have data), or whether there is data only on the SDT bearer, but the data amount is greater than the SDT transmission threshold (corresponding to the above-mentioned SDT threshold).

[0161] 4. The base station initiates RAN paging. After successfully paging the UE, it restores the UE to the RRC connected state.

[0162] 5. The base station receives the buffered data sent by the core network and sends it to the UE in the RRC connected state.

[0163] In the second case, the core network caches only SDT data;

[0164] 1. The base station releases the UE that supports SDT to the RRC inactive state, configures SDT, and has an eDRX cycle greater than 10.24s.

[0165] 2. Some downlink data is buffered on some QoS flows in the core network. The core network sends an NGAP DL DATA NOTIFICATION to the base station, which carries the amount of data in the core network buffer for each QoS flow (corresponding to the downlink data amount information mentioned above).

[0166] 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 DL SDT transmission threshold (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 buffered 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).

[0167] 4. The base station initiates RAN paging and indicates 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).

[0168] 5. The base station receives the buffered 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 (i.e., transmits it to the UE) in the Inactive state.

[0169] Based on the above, the solutions provided by the embodiments of the present disclosure involve the following contents:

[0170] Base station side:

[0171] 1) The base station receives the cached DL data volume information sent by the core network (corresponding to the above-mentioned downlink data volume information received from the core network device); based on this information, it determines whether the paging message of the air interface contains an 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 information).

[0172] 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 buffered on each QoS flow (corresponding to the downlink data volume buffered on each QoS flow).

[0173] 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 without cached data).

[0174] 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 DL SDT transmission threshold (corresponding to the above-mentioned determination of whether there is cached data only on the QoS flow corresponding to the SDT bearer based on 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 DL SDT transmission threshold (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).

[0175] 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).

[0176] Core network side:

[0177] 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).

[0178] 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, the first request is used to request the core network device to cache data and feedback information related to the downlink data volume).

[0179] 3) As described in 1), the DL data volume related information 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).

[0180] 4) According to 3), 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 without cached data).

[0181] As described 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 deems the UE reachable, it triggers the base station to perform RAN paging, and the core network sends the buffered data. 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 and data volume of the data buffered by the core network. In the case of only DL SDT data transmission, the UE's RRC connection state does not need to be restored, and the UE's DL data transmission can be completed in the Inactive state. This is more efficient and avoids problems such as the base station's inability to determine how to page or whether to restore the air interface due to a lack of information about the currently buffered data, making data transmission more efficient.

[0182] The embodiment of the present disclosure further provides a data transmission device, which is a wireless access network device, as shown in FIG7 , including a memory 71 , a transceiver 72 , and a processor 73 :

[0183] 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:

[0184] Receiving, via 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 buffered by the core network device;

[0185] Determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data amount related information.

[0186] The data transmission device provided by the embodiment of the present disclosure receives information related to the downlink data volume sent by the core network device; wherein, the information related to the downlink data volume 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 downlink data volume; and can support accurate SDT, which effectively solves the problem of inability to accurately perform SDT in related technologies.

[0187] Specifically, the transceiver 72 is used to receive and send data under the control of the processor 73.

[0188] In FIG7 , 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. 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, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, and the like. 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.

[0189] 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.

[0190] 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.

[0191] In the embodiment of the present disclosure, the at least one quality of service QoS flow includes: a first QoS flow of unbuffered 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 unbuffered data.

[0192] Among them, the determining whether to initiate downlink small data transmission MT-SDT paging based on the downlink data volume related information includes: determining whether there is cached data only on the QoS flow corresponding to the SDT bearer and the downlink data volume related information, 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.

[0193] Furthermore, the operation also includes: 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, the first request being used to request the core network device to cache data and feedback the downlink data volume related information; the receiving downlink data volume related information sent by the core network device includes: receiving the downlink data volume related information sent by the core network device according to the first request.

[0194] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure 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 of this embodiment that are the same as the method embodiment will not be described in detail here.

[0195] The embodiment of the present disclosure further provides a data transmission device, which is a core network device, as shown in FIG8 , including a memory 81 , a transceiver 82 , and a processor 83 :

[0196] 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:

[0197] Determining downlink data volume related information; wherein the downlink data volume related information corresponds to the downlink data cached by the core network device;

[0198] The downlink data volume related information is sent to the wireless access network device via the transceiver 82 .

[0199] The data transmission device provided by the embodiment of the present disclosure 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 effectively solves the problem of inability to accurately perform SDT in related technologies.

[0200] Specifically, the transceiver 82 is used to receive and send data under the control of the processor 83.

[0201] In FIG8 , 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. 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 82 may be a plurality of components, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, or the like. 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.

[0202] 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.

[0203] 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.

[0204] In the embodiment of the present disclosure, the at least one quality of service QoS flow includes: a first QoS flow of unbuffered 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 unbuffered data.

[0205] 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 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.

[0206] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure 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 of this embodiment that are the same as the method embodiment will not be described in detail here.

[0207] The present disclosure also provides a data transmission device, which is applied to a wireless access network device, as shown in FIG9 , including:

[0208] 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 buffered by the core network device;

[0209] The first determining unit 92 is configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the downlink data amount related information.

[0210] The data transmission device provided by the embodiment of the present disclosure 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 effectively solves the problem of inability to accurately perform SDT in related technologies.

[0211] 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.

[0212] In the embodiment of the present disclosure, the at least one quality of service QoS flow includes: a first QoS flow of unbuffered 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 unbuffered data.

[0213] Among them, the determining whether to initiate downlink small data transmission MT-SDT paging based on the downlink data volume related information includes: determining whether there is cached data only on the QoS flow corresponding to the SDT bearer and the downlink data volume related information, 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.

[0214] 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 downlink data volume related information sent by the core network device, the first request being used to request the core network device to cache data and feedback the downlink data volume related information; the downlink data volume related information received from the core network device includes: receiving the downlink data volume related information sent by the core network device according to the first request.

[0215] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure 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 of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0216] The present disclosure also provides a data transmission device, which is applied to a core network device, as shown in FIG10 , including:

[0217] The second determining unit 101 is configured to determine information related to a downlink data volume; wherein the information related to the downlink data volume corresponds to the downlink data buffered by the core network device;

[0218] The second sending unit 102 is configured to send the downlink data volume related information to a wireless access network device.

[0219] The data transmission device provided in the embodiment of the present disclosure 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 effectively solves the problem of inability to accurately perform SDT in related technologies.

[0220] 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.

[0221] In the embodiment of the present disclosure, the at least one quality of service QoS flow includes: a first QoS flow of unbuffered 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 unbuffered data.

[0222] 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 feedback the information related to the downlink data volume; the determination of 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.

[0223] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure 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 of this embodiment that are the same as the method embodiment will not be described in detail here.

[0224] It should be noted that the division of units in the embodiments of the present disclosure is schematic and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0225] 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 disclosure is essentially or the part that contributes to the relevant technology 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 for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0226] An embodiment of the present disclosure further provides a non-transitory readable storage medium storing a computer program, wherein 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.

[0227] 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 disks (MO)), etc.), optical storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as compact disks (CD), digital video discs (DVD), Blu-ray discs (BD), high-definition versatile discs (HVD), etc.), and semiconductor memory (such as read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), non-volatile memory (NAND FLASH), solid state disk (SSD), etc.).

[0228] Among them, the implementation embodiments of the above-mentioned methods 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 effects.

[0229] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0230] The present disclosure 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 disclosure. 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 produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0231] 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 a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0232] 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, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0233] It should be noted that it should be understood that the division of the above modules is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, these modules can all be implemented in the form of software called by a processing element; or they can all be implemented in the form of hardware; or some modules can be implemented in the form of software called by a processing element, and some modules can be implemented in the form of hardware. For example, the determination module can be a separately established processing element, or it can be integrated into a chip of the above-mentioned device. In addition, it can also be stored in the memory of the above-mentioned device in the form of program code, and called by a processing element of the above-mentioned device to perform the functions of the above-mentioned determination module. The implementation of other modules is similar. In addition, these modules can all or partly be integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules can be completed by the hardware integrated logic circuit in the processor element or by instructions in the form of software.

[0234] For example, each module, unit, sub-unit or sub-module may be one or more integrated circuits configured to implement the above method, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented by scheduling program code through a processing element, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0235] The terms "first," "second," and the like in the specification and claims of the present disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present disclosure described herein may be implemented in a sequence other than that illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units need not be limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or devices. In addition, the use of "and / or" in the specification and claims to indicate at least one of the connected objects, for example, A and / or B and / or C, means that seven situations are included: A alone, B alone, C alone, both A and B present, both B and C present, both A and C present, and all A, B, and C present. Similarly, the use of "at least one of A and B" in the specification and claims should be understood to mean "A alone, B alone, or both A and B present."

[0236] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A data transmission method, applied to a wireless access network device, comprising: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, comprising: Determine the downlink data volume related information; wherein the downlink data volume related information corresponds to the core Downlink data cached by the heart network device; Send the downlink data volume related information to the wireless access network device.

7. The data transmission method according to claim 6, wherein: 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, wherein: 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, wherein: 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, comprising a memory, a transceiver, and a 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 downlink data volume related information sent by the core network device through the transceiver; 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.

11. The data transmission device according to claim 10, wherein: 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, wherein: 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, wherein: 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, wherein: 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, comprising a memory, a transceiver, and a 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 the 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, wherein: 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, wherein: 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, wherein: 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, comprising: 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, wherein: 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. The data transmission device according to claim 20, wherein: 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.

22. The data transmission device according to claim 19, wherein: 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.

23. The data transmission device according to claim 22, further comprising: 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; 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.

24. A data transmission device, applied to a core network device, comprising: 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.

25. The data transmission device according to claim 24, wherein: 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.

26. The data transmission device according to claim 25, wherein: 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.

27. The data transmission device according to claim 24, further comprising: 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; 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.

28. A readable storage medium storing a computer program, wherein the computer program is configured to cause a processor to execute the method according to any one of claims 1 to 9.

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