Data transmission method, device and equipment

Abstract

The invention provides a data transmission method, device and equipment, and the method comprises the steps: transmitting first information to core network equipment; receiving data sent by the core network equipment according to the first information; wherein the first information comprises at least one of the following items: an explicit indication or an implicit indication for requesting the core network equipment to cache data; the first identifier is mapped to a quality of service (QoS) flow borne by small data transmission (SDT); a second identifier mapped to a QoS flow of a non-SDT bearer; the data size upper limit allowed by the wireless access network equipment is obtained. According to the scheme, the core network equipment can be accurately assisted to perform data caching, accurately perform SDT and the like, and the problems that in the prior art, SDT cannot be accurately performed, and data caching cannot be accurately performed are 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 buffered by the core network. 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, and there is also an unclear issue about how the core network caches data.

[0003] As described 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 cache downlink data, there are problems such as failure to accurately perform SDT and data caching. 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 in the prior art that SDT cannot be accurately performed and data caching cannot be accurately performed.

[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] Sending first information to a core network device;

[0007] Receiving data sent by the core network device according to the first information;

[0008] The first information includes at least one of the following:

[0009] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0010] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0011] A second identifier mapped to a QoS flow not carried by SDT;

[0012] The upper limit of the data size allowed by the wireless access network device.

[0013] Optionally, the receiving data sent by the core network device according to the first information includes:

[0014] Receiving data sent by the core network device that meets the first condition;

[0015] The data satisfying the first condition includes at least one of the following:

[0016] Map the data carried by SDT;

[0017] Data mapped to the SDT bearer and with a data volume less than the upper limit of the data size;

[0018] Cached non-SDT data.

[0019] Optionally, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0020] Optionally, also include:

[0021] Determine whether to initiate downlink small data transmission MT-SDT paging according to the second information;

[0022] The second information includes at least one of the following:

[0023] The amount of SDT data cached in the wireless access network device;

[0024] Whether SDT data is received before paging;

[0025] Whether the downlink data notification sent by the core network device is received.

[0026] The embodiment of the present application also provides a data transmission method, which is applied to a core network device, including:

[0027] Receiving first information sent by a wireless access network device;

[0028] Performing data processing according to the first information;

[0029] Wherein, the data processing includes: data caching, and / or data sending;

[0030] The first information includes at least one of the following:

[0031] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0032] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0033] A second identifier mapped to a QoS flow not carried by SDT;

[0034] The upper limit of the data size allowed by the wireless access network device.

[0035] Optionally, the performing data processing according to the first information includes at least one of the following:

[0036] Cache mapping of data carried by non-SDT;

[0037] Sending data mapped on the SDT bearer to the wireless access network device;

[0038] Cache data mapped in the SDT and carried by the SDT and whose data volume is greater than or equal to the data size upper limit;

[0039] Sending data mapped on the SDT bearer and with a data volume less than the data size upper limit to the wireless access network device;

[0040] The buffered non-SDT data is sent to the wireless access network device.

[0041] Optionally, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0042] 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:

[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] Sending first information to a core network device through the transceiver;

[0045] Receiving, by the transceiver, data sent by the core network device according to the first information;

[0046] The first information includes at least one of the following:

[0047] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0048] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0049] A second identifier mapped to a QoS flow not carried by SDT;

[0050] The upper limit of the data size allowed by the wireless access network device.

[0051] Optionally, the receiving data sent by the core network device according to the first information includes:

[0052] Receiving data sent by the core network device that meets the first condition;

[0053] The data satisfying the first condition includes at least one of the following:

[0054] Map the data carried by SDT;

[0055] Data mapped to the SDT bearer and with a data volume less than the upper limit of the data size;

[0056] Cached non-SDT data.

[0057] Optionally, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0058] Optionally, the operation further includes:

[0059] Determine whether to initiate downlink small data transmission MT-SDT paging according to the second information;

[0060] The second information includes at least one of the following:

[0061] The amount of SDT data cached in the wireless access network device;

[0062] Whether SDT data is received before paging;

[0063] Whether the downlink data notification sent by the core network device is received.

[0064] 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:

[0065] 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:

[0066] Receiving, by the transceiver, first information sent by a wireless access network device;

[0067] Performing data processing according to the first information;

[0068] Wherein, the data processing includes: data caching, and / or data sending;

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

[0070] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0071] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0072] A second identifier mapped to a QoS flow not carried by SDT;

[0073] The upper limit of the data size allowed by the wireless access network device.

[0074] Optionally, the performing data processing according to the first information includes at least one of the following:

[0075] Cache mapping of data carried by non-SDT;

[0076] Sending data mapped on the SDT bearer to the wireless access network device through the transceiver;

[0077] Cache data mapped in the SDT and carried by the SDT and whose data volume is greater than or equal to the data size upper limit;

[0078] Sending, through the transceiver, data mapped on the SDT bearer and with a data volume less than the data size upper limit to the wireless access network device;

[0079] The buffered non-SDT data is sent to the wireless access network device through the transceiver.

[0080] Optionally, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0081] The embodiment of the present application further provides a data transmission device, which is applied to a wireless access network device, including:

[0082] A first sending unit, configured to send first information to a core network device;

[0083] A first receiving unit, configured to receive data sent by the core network device according to the first information;

[0084] The first information includes at least one of the following:

[0085] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0086] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0087] A second identifier mapped to a QoS flow not carried by SDT;

[0088] The upper limit of the data size allowed by the wireless access network device.

[0089] Optionally, the receiving data sent by the core network device according to the first information includes:

[0090] Receiving data sent by the core network device that meets the first condition;

[0091] The data satisfying the first condition includes at least one of the following:

[0092] Map the data carried by SDT;

[0093] Data mapped to the SDT bearer and with a data volume less than the upper limit of the data size;

[0094] Cached non-SDT data.

[0095] Optionally, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0096] Optionally, also include:

[0097] A first determining unit, configured to determine whether to initiate downlink small data transmission MT-SDT paging according to the second information;

[0098] The second information includes at least one of the following:

[0099] The amount of SDT data cached in the wireless access network device;

[0100] Whether SDT data is received before paging;

[0101] Whether the downlink data notification sent by the core network device is received.

[0102] The embodiment of the present application also provides a data transmission device, which is applied to a core network device, including:

[0103] A second receiving unit, configured to receive first information sent by a wireless access network device;

[0104] A first processing unit, configured to perform data processing according to the first information;

[0105] Wherein, the data processing includes: data caching, and / or data sending;

[0106] The first information includes at least one of the following:

[0107] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0108] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0109] A second identifier mapped to a QoS flow not carried by SDT;

[0110] The upper limit of the data size allowed by the wireless access network device.

[0111] Optionally, the performing data processing according to the first information includes at least one of the following:

[0112] Cache mapping of data carried by non-SDT;

[0113] Sending data mapped on the SDT bearer to the wireless access network device;

[0114] Cache data mapped in the SDT and carried by the SDT and whose data volume is greater than or equal to the data size upper limit;

[0115] Sending data mapped on the SDT bearer and with a data volume less than the data size upper limit to the wireless access network device;

[0116] The buffered non-SDT data is sent to the wireless access network device.

[0117] Optionally, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0118] 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.

[0119] The beneficial effects of the above technical solution of the present application are as follows:

[0120] In the above scheme, the data transmission method sends a first information to the core network device; receives data sent by the core network device according to the first information; wherein the first information includes at least one of the following: an explicit indication or implicit indication requesting the core network device to cache data; a first identifier mapped to a quality of service QoS flow carried by a small data transmission SDT; a second identifier mapped to a QoS flow carried by a non-SDT; the upper limit of the data size allowed by the wireless access network device; and can support accurate assistance to the core network device for data caching, accurate SDT, etc., which well solves the problem of inability to accurately perform SDT and inability to accurately perform data caching in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0121] Figure 1 A schematic diagram of the wireless communication system architecture of an embodiment of the present application;

[0122] Figure 2 A schematic diagram of a radio resource control state transition according to an embodiment of the present application;

[0123] Figure 3 This is a schematic diagram of core network cache data in an embodiment of the present application;

[0124] Figure 4 This is a schematic diagram of a core network cache data notification according to an embodiment of the present application;

[0125] Figure 5 The data transmission method of the present invention is shown in the following figure. Figure 1 ;

[0126] Figure 6 The data transmission method of the present invention is shown in the following figure. Figure 2 ;

[0127] Figure 7 The data transmission device structure of the embodiment of the present application is shown in FIG. Figure 1 ;

[0128] Figure 8 The data transmission device structure of the embodiment of the present application is shown in FIG. Figure 2 ;

[0129] Fig. 9 The structure of the data transmission device of the embodiment of the present application is shown as follows: Figure 1 ;

[0130] Fig.10 The structure of the data transmission device of the embodiment of the present application is shown as follows: Figure 2 . DETAILED DESCRIPTION

[0131] 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.

[0132] 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.

[0133] In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] The following first introduces the contents involved in the solution provided in the embodiment of the present application.

[0140] (1) Definition and characteristics of the Inactive state;

[0141] 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.

[0142] 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.

[0143] The relationship between the above three radio resource control (RRC) states can be as follows: Figure 2 shown.

[0144] (2) Enhanced Discontinuous Reception (eDRX) in inactive mode;

[0145] 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.

[0146] 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.

[0147] 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.

[0148] (3) MT-SDT (Mobile Terminated Small Data Transmission);

[0149] 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.

[0150] 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.

[0151] Based on the above, the embodiments of the present application provide a data transmission method, device and equipment to solve the problem that SDT and data caching cannot be performed accurately 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.

[0152] 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:

[0153] Step 51: Sending first information to a core network device;

[0154] Step 52: Receive data sent by the core network device according to the first information; wherein the first information includes at least one of the following: an explicit or implicit indication requesting the core network device to cache data; a first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; a second identifier mapped to a QoS flow not carried by SDT; and an upper limit on the data size allowed by the wireless access network device.

[0155] The data transmission method provided in the embodiment of the present application is through sending first information to the core network device; receiving data sent by the core network device according to the first information; wherein the first information includes at least one of the following: an explicit indication or implicit indication requesting the core network device to cache data; a first identifier mapped to a quality of service QoS flow carried by a small data transmission SDT; a second identifier mapped to a QoS flow carried by a non-SDT; the upper limit of the data size allowed by the wireless access network device; and being able to support accurate assistance to the core network device for data caching, accurate SDT, etc., which well solves the problem in the prior art that SDT and data caching cannot be accurately performed.

[0156] Among them, the receiving of data sent by the core network device according to the first information includes: receiving data that meets the first condition and is sent by the core network device; wherein, the data that meets the first condition includes at least one of the following: data mapped on the SDT bearer; data mapped on the SDT bearer and the data volume is less than the data size upper limit; cached non-SDT data.

[0157] This supports accurate SDT.

[0158] In an embodiment of the present application, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0159] This can support core network devices to process data at multiple granularities.

[0160] Furthermore, the data transmission method also includes: determining whether to initiate downlink small data transmission MT-SDT paging based on second information; wherein the second information includes at least one of the following: the amount of SDT data cached in the wireless access network device; whether SDT data is received before paging; whether a downlink data notification sent by the core network device is received.

[0161] In this way, it can be accurately determined whether to initiate MT-SDT paging.

[0162] The present application also provides a data transmission method, which is applied to a core network device, such as Figure 6 As shown, including:

[0163] Step 61: Receive first information sent by a wireless access network device;

[0164] Step 62: Perform data processing according to the first information; wherein the data processing includes: data caching, and / or data sending; the first information includes at least one of the following: an explicit or implicit indication requesting the core network device to cache data; a first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; a second identifier mapped to a QoS flow not carried by SDT; the upper limit of the data size allowed by the wireless access network device.

[0165] The data transmission method provided in the embodiment of the present application is through receiving the first information sent by the wireless access network device; performing data processing according to the first information; wherein the data processing includes: data caching, and / or, data sending; the first information includes at least one of the following: an explicit indication or implicit indication requesting the core network device to cache data; a first identifier mapped to the service quality QoS flow carried by the small data transmission SDT; a second identifier mapped to the QoS flow carried by the non-SDT; the upper limit of the data size allowed by the wireless access network device; it can support the accurate implementation of data caching and SDT of the core network device, and well solve the problems in the prior art that SDT and data caching cannot be accurately performed.

[0166] Among them, the data processing according to the first information includes at least one of the following: caching data mapped on a non-SDT bearer; sending data mapped on an SDT bearer to the wireless access network device; caching data mapped on an SDT bearer and whose data volume is greater than or equal to the data size upper limit; sending data mapped on an SDT bearer and whose data volume is less than the data size upper limit to the wireless access network device; sending cached non-SDT data to the wireless access network device.

[0167] This can support core network devices to accurately cache data, accurately perform SDT and other operations.

[0168] In an embodiment of the present application, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0169] This can support core network devices to process data at multiple granularities.

[0170] 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.

[0171] In response to the above technical problems, an embodiment of the present application provides a data transmission method, which can be specifically implemented as a method for the core network to process small data under enhanced discontinuous reception, which can solve the problem of how the core network processes 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).

[0172] This solution mainly involves: a method for the base station to provide information and assist the core network to buffer data, including the following contents:

[0173] The base station sends the QoS flow Identity (QFI) of the QoS flow mapped to the non SDT bearer (non-small data transmission bearer) and / or the SDT bearer (small data transmission bearer) to the core network, and / or the base station sends the tolerable date size (data size threshold) to the core network to request the core network to buffer the data (corresponding to the first information sent to the core network device as mentioned above). For the data mapped to the SDT bearer, the core network can directly send it to the base station, or when the data size is less than the data size threshold (such as the data mapped to the SDT bearer and the data volume is less than the data size upper limit), the core network can directly send it to the base station, but it is not limited to this.

[0174] Specifically, the above content can be implemented as follows:

[0175] 1. The base station sends an NGAP MT COMMUNICATION HANDLING REQUEST to the core network, carrying one or more of the following information:

[0176] (1) Request explicit indication of the core network (such as AMF) buffer data, or implicitly indicate the core network buffer data by providing at least one of the following information: edrx (enhanced discontinuous reception), PTW (paging time window), and PTW start (paging time window start);

[0177] (2) The QFI of the QoS flow mapped to non-SDT bearers (corresponding to the second identifier above);

[0178] (3) The QFI of the QoS flow mapped to the SDT bearers (corresponding to the first identifier above);

[0179] (4) Data size threshold (corresponding to the upper limit of data size allowed by the above-mentioned wireless access network equipment).

[0180] The threshold:

[0181] 1) It can be the data size threshold of per SDT QoS flow (corresponding to the upper limit of the data size of a QoS flow mapped on an SDT bearer as mentioned above);

[0182] 2) It may also be a data size threshold per SDT (corresponding to the upper limit of the total data size of all QoS flows mapped on one SDT bearer as mentioned above).

[0183] 2. Based on the above, the core network side behavior (corresponding to the above data processing according to the first information) may include:

[0184] (1) The core network only buffers data of non-SDT bearers (corresponding to the data cached and mapped on non-SDT bearers mentioned above). For other data (i.e., data mapped on SDT bearers), the core network does not buffer and directly sends it to the base station (corresponding to the data mapped on SDT bearers sent to the radio access network device mentioned above); or, the core network determines the data volume of the data mapped on SDT bearers and performs buffering when the data volume reaches the data size threshold (corresponding to the data cached and mapped on SDT bearers and the data volume is greater than or equal to the data size upper limit), otherwise, the core network does not buffer and directly sends it to the base station (corresponding to the data mapped on SDT bearers sent to the radio access network device mentioned above and the data volume is less than the data size upper limit).

[0185] (2) Before the eDRX cycle arrives, if there is buffered non-SDT data in the core network, the core network will send a DLDATA NOTIFICATION to the base station (corresponding to the above-mentioned sending of buffered non-SDT data to the radio access network device).

[0186] 3. Subsequent base station actions (corresponding to determining whether to initiate downlink small data transmission MT-SDT paging according to the second information) may include:

[0187] The base station can determine whether to perform MT-SDT paging or non-MT-SDT paging based on the amount of SDT data buffered in the base station (corresponding to the amount of SDT data buffered in the wireless access network device), whether SDT data is received before paging (before the eDRX cycle) (corresponding to whether SDT data is received before paging), and whether DL DATANOTIFICATION is received from the core network (corresponding to whether the downlink data notification sent by the core network device is received), and then initiate corresponding air interface paging and / or RAN paging.

[0188] The following is a specific example of this solution.

[0189] Example 1: The base station sends the QFI (QoS flow Identity) of the QoS flow mapped to the non-SDT bearer and / or SDT bearer to the core network;

[0190] 1. The base station releases the UE supporting SDT to the RRC inactive state and configures eDRX greater than 10.24s. The base station sends an NGAP MT COMMUNICATION HANDLING REQUEST to the core network to request the core network to buffer data. The request sent by the base station may carry the QFI of the QoS flow mapped to non-SDT bearers and / or the QFI of the QoS flow mapped to SDTbearers. The request may carry an explicit indication to indicate that the core network buffers SDT data; it may also implicitly indicate that the core network buffers SDT data through the QFI of the QoS flow mapped to (non-)SDT bearers mentioned above.

[0191] 2. The core network will decide not to buffer the data on the QFI mapped to the SDT bearer provided by the base station, and / or decide to buffer the data on the QFI mapped to the non-SDT bearer provided by the base station.

[0192] (1) For data that the core network decides not to buffer, the core network directly sends it to the base station.

[0193] (2) Before the eDRX cycle arrives, if there is buffered non-SDT data, the core network will send a DLDATA NOTIFICATION to the base station.

[0194] 3. The base station performs operations based on the content received from the core network:

[0195] (1) If the base station determines that the amount of SDT data buffered in the base station is less than the threshold (corresponding to the above-mentioned data size threshold) (for determining whether to trigger MT-SDT paging) and does not receive DL DATA NOTIFICATION from the core network, the base station determines to perform MT-SDT paging and then initiates corresponding air interface paging and / or RAN paging.

[0196] (2) If the base station determines that the amount of SDT data buffered in the base station is greater than the threshold (for determining whether to trigger MT-SDT paging), the base station determines that non-MT-SDT paging is to be performed regardless of whether a DL DATA NOTIFICATION is received from the core network, and then initiates corresponding air interface paging and / or RAN paging.

[0197] (3) If the base station does not receive the SDT data sent by the core network in advance and receives the DL DATANOTIFICATION from the core network, the base station may determine that non-MT-SDT paging is to be performed, and then initiate corresponding air interface paging and / or RAN paging.

[0198] Example 2: The base station sends the QFI (QoS flow Identity) of the QoS flow mapped to the non-SDT bearer and / or SDT bearer to the core network, and the base station sends the tolerable date size (data size threshold) to the core network.

[0199] 1. The base station releases the UE supporting SDT to the RRC inactive state and configures eDRX greater than 10.24s. The base station sends an NGAP MT COMMUNICATION HANDLING REQUEST to the core network to request the core network buffer data. The request sent by the base station may carry the QFI of the QoS flow mapped to non-SDT bearers and / or the QFI of the QoS flow mapped to SDT bearers. The request may carry an explicit indication to indicate that the core network buffers SDT data, or may implicitly indicate that the core network buffers SDT data through the QFI of the QoS flow mapped to (non-)SDT bearers mentioned above. The request may also carry the data size threshold that the base station believes it can bear, which may be per SDT QoS flow or per SDT. The threshold may be generated by the base station itself or configured by Operations, Administration and Maintenance (OAM).

[0200] 2. The core network performs operations based on the content sent by the base station:

[0201] (1) When the base station provides the QFI of the QoS flow mapped to the SDT bearer and the data size threshold per SDT QoS flow, the core network determines whether to buffer the data on the QFI based on these two pieces of information:

[0202] 1) When the core network determines that the amount of data on the QFI of the QoS flow mapped to the SDT bearer is less than the data size threshold per SDTQoS flow, it does not buffer the data on these QFIs and sends them directly to the base station.

[0203] 2) When the core network determines that the amount of data on the QFI of the QoS flow mapped to the SDT bearer is greater than the datasize threshold, it buffers the data and can also indicate the base station through DL DATA NOTIFICATION before eDRX to let the base station know that there is buffered data in the core network.

[0204] (2) Similarly, when the base station provides the QFI of the QoS flow mapped to the SDT bearer and the datasize threshold per SDT, the core network determines whether to buffer the SDT data based on these two pieces of information:

[0205] 1) When the core network determines that the total data size (total SDT data size) on the QFI of the QoS flow mapped to the SDT bearer is less than the data size threshold per SDT, it does not buffer the SDT data (i.e., the data on the QFI of the QoS flow mapped to the SDT bearer) and sends it directly to the base station.

[0206] 2) When the core network determines that the total amount of data on the QFI of the QoS flow mapped to the SDT bearer is greater than the data size threshold of perSDT, it buffers these data (i.e., the data on the QFI of the QoS flow mapped to the SDT bearer) and can also indicate the base station through DL DATA NOTIFICATION before the eDRX cycle to let the base station know that there is buffered data in the core network.

[0207] (3) When the base station provides QFIs mapped to non-SDT bearers and a data size threshold (per SDT QoSflow or per SDT), the core network needs to perform operations including: comparing the data volume corresponding to QFIs other than these QFIs (i.e., the data volume of the SDT bearer) with the data size threshold. For details, please refer to the above.

[0208] 3. The base station performs operations based on the content received from the core network:

[0209] (1) If the base station receives the SDT data sent by the core network before the eDRX cycle and does not receive the DL DATA NOTIFICATION from the core network, the base station may determine to perform MT-SDT paging and then initiate corresponding air interface paging and / or RAN paging.

[0210] (2) If the base station receives the SDT data sent by the core network before the eDRX cycle and receives the DLDATA NOTIFICATION from the core network, the base station may determine that non-MT-SDT paging is to be performed, and then initiate corresponding air interface paging and / or RAN paging.

[0211] (3) If the base station does not receive the SDT data sent by the core network in advance and receives the DL DATANOTIFICATION from the core network, the base station may determine that non-MT-SDT paging is to be performed, and then initiate corresponding air interface paging and / or RAN paging.

[0212] From the above, this solution introduces a method for enhancing the core network processing of small data under discontinuous reception: for inactive UEs with eDRX greater than 10.24s, the base station can request the core network to buffer data; when the core network believes that the UE is reachable, it triggers the base station to perform RAN paging, and the core network releases the buffered data. Among them, for MT-SDT, the base station can determine whether to trigger MT-SDT paging; if the data volume is small, the base station can trigger MT-SDT paging, and the UE does not need to enter the connected state.

[0213] 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:

[0214] 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:

[0215] Sending first information to a core network device through the transceiver 72;

[0216] Receiving, through the transceiver 72, data sent by the core network device according to the first information;

[0217] The first information includes at least one of the following:

[0218] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0219] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0220] A second identifier mapped to a QoS flow not carried by SDT;

[0221] The upper limit of the data size allowed by the wireless access network device.

[0222] The data transmission device provided in the embodiment of the present application sends a first information to a core network device; receives data sent by the core network device according to the first information; wherein the first information includes at least one of the following: an explicit or implicit indication requesting the core network device to cache data; a first identifier mapped to a quality of service QoS flow carried by a small data transmission SDT; a second identifier mapped to a QoS flow carried by a non-SDT; an upper limit on the data size allowed by the wireless access network device; and can support accurate assistance to the core network device for data caching, accurate SDT, etc., which well solves the problem in the prior art that SDT and data caching cannot be accurately performed.

[0223] Specifically, the transceiver 72 is used to receive and send data under the control of the processor 73.

[0224] 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.

[0225] 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.

[0226] Among them, the receiving of data sent by the core network device according to the first information includes: receiving data that meets the first condition and is sent by the core network device; wherein, the data that meets the first condition includes at least one of the following: data mapped on the SDT bearer; data mapped on the SDT bearer and the data volume is less than the data size upper limit; cached non-SDT data.

[0227] In an embodiment of the present application, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0228] Furthermore, the operation also includes: determining whether to initiate downlink small data transmission MT-SDT paging based on the second information; wherein the second information includes at least one of the following: the amount of SDT data cached in the wireless access network device; whether SDT data is received before paging; whether the downlink data notification sent by the core network device is received.

[0229] 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.

[0230] 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:

[0231] 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:

[0232] Receiving, through the transceiver 82, first information sent by a wireless access network device;

[0233] Performing data processing according to the first information;

[0234] Wherein, the data processing includes: data caching, and / or data sending;

[0235] The first information includes at least one of the following:

[0236] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0237] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0238] A second identifier mapped to a QoS flow not carried by SDT;

[0239] The upper limit of the data size allowed by the wireless access network device.

[0240] The data transmission device provided in the embodiment of the present application receives the first information sent by the wireless access network device; performs data processing according to the first information; wherein the data processing includes: data caching, and / or data sending; the first information includes at least one of the following: an explicit indication or implicit indication requesting the core network device to cache data; a first identifier mapped to the quality of service QoS flow carried by small data transmission SDT; a second identifier mapped to the QoS flow carried by non-SDT; the upper limit of the data size allowed by the wireless access network device; it can support the accurate implementation of data caching and SDT of the core network device, and well solve the problems in the prior art that SDT and data caching cannot be accurately performed.

[0241] Specifically, the transceiver 82 is used to receive and send data under the control of the processor 83.

[0242] Among them, Figure 8 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 83 and various circuits of memory represented by memory 81 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 82 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which transmission medium may include a wireless channel, a wired channel, an optical cable, and other transmission media. The processor 83 is responsible for managing the bus architecture and general processing, and the memory 81 may store data used by the processor 83 when performing operations.

[0243] 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.

[0244] Among them, the data processing according to the first information includes at least one of the following: caching data mapped on a non-SDT bearer; sending data mapped on an SDT bearer to the wireless access network device through the transceiver; caching data mapped on an SDT bearer and whose data volume is greater than or equal to the data size upper limit; sending data mapped on an SDT bearer and whose data volume is less than the data size upper limit to the wireless access network device through the transceiver; sending cached non-SDT data to the wireless access network device through the transceiver.

[0245] In an embodiment of the present application, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0246] 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.

[0247] 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:

[0248] A first sending unit 91, configured to send first information to a core network device;

[0249] A first receiving unit 92, configured to receive data sent by the core network device according to the first information;

[0250] The first information includes at least one of the following:

[0251] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0252] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0253] A second identifier mapped to a QoS flow not carried by SDT;

[0254] The upper limit of the data size allowed by the wireless access network device.

[0255] The data transmission device provided in the embodiment of the present application sends a first information to the core network device; receives data sent by the core network device according to the first information; wherein the first information includes at least one of the following: an explicit or implicit indication requesting the core network device to cache data; a first identifier mapped to a quality of service QoS flow carried by a small data transmission SDT; a second identifier mapped to a QoS flow carried by a non-SDT; the upper limit of the data size allowed by the wireless access network device; and can support accurate assistance to the core network device for data caching, accurate SDT, etc., which well solves the problem of inability to accurately perform SDT and inability to accurately cache data in the prior art.

[0256] Among them, the receiving of data sent by the core network device according to the first information includes: receiving data that meets the first condition and is sent by the core network device; wherein, the data that meets the first condition includes at least one of the following: data mapped on the SDT bearer; data mapped on the SDT bearer and the data volume is less than the data size upper limit; cached non-SDT data.

[0257] In an embodiment of the present application, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0258] Furthermore, the data transmission device also includes: a first determination unit, used to determine whether to initiate downlink small data transmission MT-SDT paging based on second information; wherein the second information includes at least one of the following: the amount of SDT data cached in the wireless access network device; whether SDT data is received before paging; whether a downlink data notification sent by the core network device is received.

[0259] 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.

[0260] The present application also provides a data transmission device, which is applied to a core network device, such as Fig.10 As shown, including:

[0261] The second receiving unit 101 is used to receive first information sent by a wireless access network device;

[0262] A first processing unit 102, configured to perform data processing according to the first information;

[0263] Wherein, the data processing includes: data caching, and / or data sending;

[0264] The first information includes at least one of the following:

[0265] Requesting an explicit indication or an implicit indication of the core network device to cache data;

[0266] A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer;

[0267] A second identifier mapped to a QoS flow not carried by SDT;

[0268] The upper limit of the data size allowed by the wireless access network device.

[0269] The data transmission device provided in the embodiment of the present application receives the first information sent by the wireless access network device; performs data processing according to the first information; wherein the data processing includes: data caching, and / or data sending; the first information includes at least one of the following: an explicit indication or implicit indication requesting the core network device to cache data; a first identifier mapped to the service quality QoS flow carried by the small data transmission SDT; a second identifier mapped to the QoS flow carried by the non-SDT; the upper limit of the data size allowed by the wireless access network device; it can support the accurate implementation of data caching and SDT of the core network device, and well solve the problems in the prior art that SDT and data caching cannot be accurately performed.

[0270] Among them, the data processing according to the first information includes at least one of the following: caching data mapped on a non-SDT bearer; sending data mapped on an SDT bearer to the wireless access network device; caching data mapped on an SDT bearer and whose data volume is greater than or equal to the data size upper limit; sending data mapped on an SDT bearer and whose data volume is less than the data size upper limit to the wireless access network device; sending cached non-SDT data to the wireless access network device.

[0271] In an embodiment of the present application, the data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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: Sending first information to a core network device; Receiving data sent by the core network device according to the first information; The first information includes at least one of the following: Requesting an explicit indication or an implicit indication of the core network device to cache data; A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; A second identifier mapped to a QoS flow not carried by SDT; The upper limit of the data size allowed by the wireless access network device.

2. The data transmission method according to claim 1, characterized in that: The receiving data sent by the core network device according to the first information includes: Receiving data sent by the core network device that meets the first condition; The data satisfying the first condition includes at least one of the following: Map the data carried by SDT; Data mapped to the SDT bearer and with a data volume less than the upper limit of the data size; Cached non-SDT data.

3. The data transmission method according to claim 1, characterized in that: The data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

4. The data transmission method according to claim 1, characterized in that: Also includes: Determine whether to initiate downlink small data transmission MT-SDT paging according to the second information; The second information includes at least one of the following: The amount of SDT data cached in the wireless access network device; Whether SDT data is received before paging; Whether the downlink data notification sent by the core network device is received.

5. A data transmission method, applied to a core network device, characterized in that: include: Receiving first information sent by a wireless access network device; Performing data processing according to the first information; Wherein, the data processing includes: data caching, and / or data sending; The first information includes at least one of the following: Requesting an explicit indication or an implicit indication of the core network device to cache data; A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; A second identifier mapped to a QoS flow not carried by SDT; The upper limit of the data size allowed by the wireless access network device.

6. The data transmission method according to claim 5, characterized in that: The performing data processing according to the first information includes at least one of the following: Cache mapping of data carried by non-SDT; Sending data mapped on the SDT bearer to the wireless access network device; Cache data mapped in the SDT and carried by the SDT and whose data volume is greater than or equal to the data size upper limit; Sending data mapped on the SDT bearer and with a data volume less than the data size upper limit to the wireless access network device; The buffered non-SDT data is sent to the wireless access network device.

7. The data transmission method according to claim 5, characterized in that: The data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

8. 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: Sending first information to a core network device through the transceiver; Receiving, by the transceiver, data sent by the core network device according to the first information; The first information includes at least one of the following: Requesting an explicit indication or an implicit indication of the core network device to cache data; A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; A second identifier mapped to a QoS flow not carried by SDT; The upper limit of the data size allowed by the wireless access network device.

9. The data transmission device according to claim 8, characterized in that: The receiving data sent by the core network device according to the first information includes: Receiving data sent by the core network device that meets the first condition; The data satisfying the first condition includes at least one of the following: Map the data carried by SDT; Data mapped to the SDT bearer and with a data volume less than the upper limit of the data size; Cached non-SDT data.

10. The data transmission device according to claim 8, characterized in that: The data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

11. The data transmission device according to claim 8, characterized in that: The operations also include: Determine whether to initiate downlink small data transmission MT-SDT paging according to the second information; The second information includes at least one of the following: The amount of SDT data cached in the wireless access network device; Whether SDT data is received before paging; Whether the downlink data notification sent by the core network device is received.

12. 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: Receiving, by the transceiver, first information sent by a wireless access network device; Performing data processing according to the first information; Wherein, the data processing includes: data caching, and / or data sending; The first information includes at least one of the following: Requesting an explicit indication or an implicit indication of the core network device to cache data; A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; A second identifier mapped to a QoS flow not carried by SDT; The upper limit of the data size allowed by the wireless access network device.

13. The data transmission device according to claim 12, characterized in that: The performing data processing according to the first information includes at least one of the following: Cache mapping of data carried by non-SDT; Sending data mapped on the SDT bearer to the wireless access network device through the transceiver; Cache data mapped in the SDT and carried by the SDT and whose data volume is greater than or equal to the data size upper limit; Sending, through the transceiver, data mapped on the SDT bearer and with a data volume less than the data size upper limit to the wireless access network device; The buffered non-SDT data is sent to the wireless access network device through the transceiver.

14. The data transmission device according to claim 12, characterized in that: The data size upper limit includes: the data size upper limit of a QoS flow mapped on an SDT bearer, and / or the data size upper limit of the total data of all QoS flows mapped on an SDT bearer.

15. A data transmission device, applied to a wireless access network device, characterized in that: include: A first sending unit, configured to send first information to a core network device; A first receiving unit, configured to receive data sent by the core network device according to the first information; The first information includes at least one of the following: Requesting an explicit indication or an implicit indication of the core network device to cache data; A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; A second identifier mapped to a QoS flow not carried by SDT; The upper limit of the data size allowed by the wireless access network device.

16. The data transmission device according to claim 15, characterized in that: The receiving data sent by the core network device according to the first information includes: Receiving data sent by the core network device that meets the first condition; The data satisfying the first condition includes at least one of the following: Map the data carried by SDT; Data mapped to the SDT bearer and with a data volume less than the upper limit of the data size; Cached non-SDT data.

17. A data transmission device, applied to a core network device, characterized in that: include: A second receiving unit, configured to receive first information sent by a wireless access network device; A first processing unit, configured to perform data processing according to the first information; Wherein, the data processing includes: data caching, and / or data sending; The first information includes at least one of the following: Requesting an explicit indication or an implicit indication of the core network device to cache data; A first identifier of a quality of service QoS flow mapped to a small data transmission SDT bearer; A second identifier mapped to a QoS flow not carried by SDT; The upper limit of the data size allowed by the wireless access network device.

18. The data transmission device according to claim 17, characterized in that: The performing data processing according to the first information includes at least one of the following: Cache mapping of data carried by non-SDT; Sending data mapped on the SDT bearer to the wireless access network device; Cache data mapped in the SDT and carried by the SDT and whose data volume is greater than or equal to the data size upper limit; Sending data mapped on the SDT bearer and with a data volume less than the data size upper limit to the wireless access network device; The buffered non-SDT data is sent to the wireless access network device.

19. 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 7.

Images