Data transmission method and device, storage medium and program product

Abstract

The invention provides a data transmission method and device, a storage medium and a program product, relates to the technical field of communication, and is used for improving the data transmission efficiency. The method comprises the following steps: receiving first indication information, wherein the first indication information is used for indicating that non-small data transmission data of a terminal arrives or small data transmission of the terminal is ended; obtaining complete context information of the terminal in response to the first indication information; modifying the current context information of the terminal according to the complete context information of the terminal to obtain modified context information; and transmitting data of the terminal according to the modified context information, wherein the data of the terminal at least comprises non-small data transmission data of the terminal.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a data transmission method, device, storage medium and program product. Background Art

[0002] In the fifth generation mobile communication technology (5G) system, when the user equipment (UE) and the network side are performing small data transmission (SDT) transmission, when non-SDT data arrives at the network side and needs to be transmitted to the UE, the network side needs to release the UE to the radio resource control (RRC) inactive (INACTIVE) state or RRC idle (IDLE) state again, and re-page the UE, which brings serious delay problems to the terminal data transmission and increases the signaling load of the air interface. Summary of the invention

[0003] The embodiments of the present disclosure provide a data transmission method, device, storage medium and program product for improving data transmission efficiency. The technical solutions provided by the embodiments of the present disclosure are as follows:

[0004] In one aspect, a data transmission method is provided, which is applied to a network device, and the method comprises:

[0005] receiving first indication information, where the first indication information is used to indicate the arrival of non-small data transmission data of the terminal or the end of the small data transmission of the terminal;

[0006] acquiring complete context information of the terminal in response to the first indication information;

[0007] Modifying the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information;

[0008] The data of the terminal is transmitted according to the modified context information, and the data of the terminal at least includes the non-small data transmission data of the terminal.

[0009] On the other hand, a data transmission device is provided, which is applied to a network device, and the device includes:

[0010] A communication module, used to receive first indication information, where the first indication information is used to indicate the arrival of non-small data transmission data of the terminal or the end of the small data transmission of the terminal;

[0011] An acquisition module, configured to acquire complete context information of the terminal in response to the first indication information;

[0012] A processing module, used to modify the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information;

[0013] The communication module is further used to transmit the data of the terminal according to the modified context information, where the data of the terminal at least includes the non-small data transmission data of the terminal.

[0014] On the other hand, a communication device is provided, comprising: a memory and a processor; the memory and the processor are coupled; the memory is used to store computer program instructions executable by the processor; and the data transmission method of any of the above embodiments is implemented when the processor executes the computer program instructions.

[0015] On the other hand, a computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed on a computer (eg, a data transmission device), the data transmission method of any of the above embodiments is implemented.

[0016] On the other hand, a computer program product is provided, which includes computer program instructions, and when the computer program instructions are executed, the data transmission method of any of the above embodiments is implemented.

[0017] The technical solution provided by the embodiment of the present disclosure receives a first indication message, the first indication message is used to indicate the arrival of the non-small data transmission data of the terminal or the end of the small data transmission of the terminal; obtains the complete context information of the terminal in response to the first indication message; modifies the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information; transmits the data of the terminal according to the modified context information, and the data of the terminal includes at least the non-small data transmission data of the terminal. In this way, when performing small data transmission, if the non-small data transmission data of the terminal is received, the current context information of the terminal can be directly modified, and the non-small data transmission data of the terminal can be transmitted based on the modified context information. It avoids the delay and increased signaling load of the air interface caused by the network side needing to release the terminal to the RRC INACTIVE state or the RRC IDLE state again, and then re-paging the terminal. The data transmission efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a communication system provided by an embodiment of the present disclosure;

[0019] Figure 2 A flowchart of a data transmission method provided by an embodiment of the present disclosure;

[0020] Figure 3An interactive flow chart of a data transmission method provided by an embodiment of the present disclosure;

[0021] Figure 4 An interactive flow chart of another data transmission method provided by an embodiment of the present disclosure;

[0022] Figure 5 An interactive flow chart of another data transmission method provided by an embodiment of the present disclosure;

[0023] Figure 6 An interactive flow chart of another data transmission method provided by an embodiment of the present disclosure;

[0024] Figure 7 A schematic diagram of the structure of a data transmission device provided in an embodiment of the present disclosure;

[0025] Figure 8 A schematic diagram of the structure of a communication device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0026] The following will be combined with the 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 described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0027] It should be understood that the specific implementations described herein are only used to explain the present disclosure, and are not used to limit the present disclosure.

[0028] In the subsequent description, suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present disclosure and have no specific meanings themselves. Therefore, "module", "component" or "unit" may be used interchangeably.

[0029] In the description of the present disclosure, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "plurality" means two or more. The words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not limit them to be different.

[0030] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0032] In the embodiments of the present disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present disclosure should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0033] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0034] In the communication system, the terminal can be in any of the following RRC states: idle state, inactive state, and connected state. When the terminal is in the connected state, the terminal and the network device perform data transmission. When the terminal is in the idle state or inactive state, the terminal generally does not perform data transmission with the network side.

[0035] Among them, the base station that serves the terminal when the terminal enters the inactive state is called the anchor base station. The terminal has mobility. When the terminal in the inactive state moves to the coverage of other base stations except the anchor base station, and data transmission is required between the terminal and the network side, the other base station will obtain the context information of the terminal from the anchor base station, and then the terminal requests RRC connection recovery from the other base station to enter the connected state and perform data transmission in the connected state.

[0036] In one case, in order to reduce the delay of data transmission, when the terminal is in an inactive state, the terminal is allowed to perform SDT with the base station. SDT means that when the amount of data to be transmitted is less than a certain threshold, or the number of data packets of data to be transmitted is less than a certain number, the terminal can remain in an inactive state, and the data to be transmitted can be transmitted between the terminal and the network side without entering a connected state.

[0037] With the development of smart terminals and IoT terminals, the number of users of some instant messaging services such as WeChat, Twitter, QQ message and other applications is increasing. These services are usually online all the time, and when users use them, they mainly transmit small data, such as text messages. Since small data services require UE to frequently reestablish signaling links with the network side, it will cause problems such as increased signaling load on the network side.

[0038] In 4G, in order to optimize the support for infrequent transmission of small data packets, the 4G network supports the UE to carry the corresponding small data in the RACH access request message or the RRC connection establishment request message when the UE accesses the random access channel (RACH). In this way, the UE can transmit occasional SDT data without frequently reestablishing the signaling link with the network side.

[0039] There are only two RRC states in 4G LTE: RRC idle state and RRC connected (CONNECTED) state. 5G introduces RRC INACTIVE state. In RRC INACTIVE state, the UE is in a power-saving sleep state, but the UE still retains the context information on the network side, and the network side also retains the context information on the UE side (UE context). In this way, when there is data transmission, the UE can quickly transfer from RRC INACTIVE state to RRC CONNECTE state and perform data transmission. This can reduce signaling overhead, enable fast access, reduce latency, and save more power.

[0040] However, for small data transmission, 5G also supports UE to maintain RRC INACTIVE state without entering RRC CONNECTED state and transmit data with the network side. 5G SDT includes RACH-based SDT and SDT based on dedicated scheduling (configured gran, CG) resources. When the UE is configured with CG resources in RRC INACTIVE state, the UE can use CG resources for SDT in RRC INACTIVE state, but the signal quality of the UE's CG resources may not be very good. In this case, the UE may use RACH access process for SDT in RRC INACTIVE state even if CG resources are configured.

[0041] In the current 5G system, when the UE and the network are performing SDT, it is possible that the network will receive non-SDT data of the UE from the core network (CN), such as other data radio bearer (DRB) data that does not support SDT configuration. At this time, according to the relevant process, the network first needs to release the UE to the RRC INACTIVE state and terminate the current SDT data transmission, or release the UE to the RRC IDLE state. Then the network re-pages the UE. If the paging is successful, the network sends an RRC message to the UE, instructing the UE to enter or restore the RRC CONNECTED state. After the UE enters the RRC CONNECTED state, the network can perform subsequent data transmission with the UE, such as transmitting non-SDT data. In this process, that is, during the SDT transmission process, when non-SDT data arrives at the network side and needs to be transmitted to the UE, the network side needs to release the UE to the RRC INACTIVE state or RRC IDLE state again, and re-page the UE, which brings serious delay problems to the terminal data transmission and increases the signaling load of the air interface.

[0042] In view of this, the present disclosure provides a data transmission method, which receives first indication information, where the first indication information is used to indicate the arrival of non-small data transmission data of a terminal or the end of small data transmission of a terminal; obtains complete context information of the terminal in response to the first indication information; modifies the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information; transmits data of the terminal according to the modified context information, wherein the data of the terminal includes at least the non-small data transmission data of the terminal.

[0043] In this way, when performing small data transmission, if non-small data transmission data of the terminal is received, the non-small data transmission data of the terminal can be directly transmitted based on the modified context information. This avoids the delay and increased signaling load of the air interface caused by the network side releasing the terminal to the RRC INACTIVE state or RRC IDLE state and re-paging the terminal before transmitting the non-small data transmission data of the terminal. This improves the data transmission efficiency.

[0044] The technical solution provided by the embodiments of the present disclosure can be applied to various mobile communication networks, for example, a new radio (NR) mobile communication network using 5G, future mobile communication networks, such as 5G-A system, 6G wireless system and various communication convergence systems, such as global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, long term evolution advanced (LTE-A) system, universal mobile system (UMTS), worldwide interoperability for microwave access (WiMAX) system, etc., all of which include terminals and network equipment. The system may also include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), etc. The embodiments of the present disclosure are not limited to this.

[0045] Figure 1 FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present disclosure. Figure 1As shown, the communication system includes a terminal 110 and a plurality of network devices, wherein the present embodiment is illustrated by taking one terminal as an example, and by taking two network devices as an example (network device 120 and network device 130, respectively). Among them, when the terminal 110 enters the inactive state, the network device serving the terminal 110 is the network device 120, and the network device 120 can also be referred to as the anchor network device of the terminal. As the terminal 110 moves, the terminal 110 moves within the coverage of the network device 130 and accesses the network device 130. At this time, the anchor network device of the terminal is not the same network device as the network device currently accessed by the terminal. In the following embodiments, the network device 120 can also be referred to as the second network device (when the second network device is a base station, the base station can be referred to as an old base station, etc.), and the network device 130 can also be referred to as the first network device (when the first network device is a base station, the base station can be referred to as a new base station, etc.).

[0046] The network device involved in the embodiments of the present disclosure 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 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 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 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 (eNB or e-NodeB) in the long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in the 5G network architecture (next generation system), or a 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 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 arranged geographically separately. For example, a base station may include a CU and multiple DUs, and the CU and DUs are connected via an F1 interface.

[0047] In the present disclosure, a terminal is a device with a wireless transceiver function, which can be deployed on land, including indoors or outdoors; it can also be deployed on the water surface (such as a ship, etc.); it can also be deployed in the air (such as an airplane, a balloon, and a satellite, etc.), and it can also 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, etc. The terminal can be a mobile phone, a tablet computer, a computer with a wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiments of the present disclosure do not limit the application scenario. The terminal may also be sometimes referred to as a user, user equipment, access terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal, mobile device, UE terminal, wireless communication device, UE agent or UE device, etc. The embodiments of the present disclosure are not limited.

[0048] It should be understood that Figure 1 is an exemplary structural diagram, Figure 1 The communication system shown includes an unlimited number of devices, such as network devices and terminals. Figure 1 In addition to the equipment shown, Figure 1 The communication system shown may also include other devices, which is not limited thereto.

[0049] The application scenarios of the embodiments of the present disclosure are not limited. The system architecture and business scenarios described in the embodiments of the present disclosure are intended to more clearly illustrate the technical solutions of the embodiments of the present disclosure, and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. It is known to those skilled in the art that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present disclosure are also applicable to similar technical problems.

[0050] The present disclosure provides a data transmission method, which is applied to a network device. Figure 2 As shown, the method comprises the following steps:

[0051] S101. Receive first indication information.

[0052] The first indication information is used to indicate the arrival of non-SDT data of the terminal or the end of the SDT of the terminal.

[0053] S102: Acquire complete context information of the terminal in response to the first indication information.

[0054] The complete context information of the terminal includes the remaining context information of the terminal except the current context information of the terminal. The current context information of the terminal may also be referred to as partial context information of the terminal, which is not limited in the present disclosure.

[0055] In some embodiments, the current context information of the terminal is used by the network device to send the uplink SDT data of the terminal to other network devices (for example, the first network device mentioned above sends the second network device mentioned above) and / or to send the downlink SDT data of the terminal to the terminal. Optionally, the current context information of the terminal includes configuration information of the bearer, such as configuration information of the bearer of at least one SDT. The bearer of the at least one SDT can be the bearer of all SDTs of the terminal, or it can be the bearer of some SDTs of the terminal. The bearer of SDT is, for example, a data radio bearer (DRB) of SDT.

[0056] In some embodiments, the complete context information of the terminal includes configuration information of all SDT bearers of the terminal and configuration information of all non-SDT bearers of the terminal, radio link control (RLC) layer configuration information of related bearers, MAC layer configuration information of related bearers, protocol data unit (PDU) session information and multicast broadcast services (MBS) session information corresponding to the bearers, etc. The complete context information of the terminal can also be specifically referred to the introduction in the relevant protocol (such as the 3GPP protocol). Non-SDT bearers are, for example, non-SDT data radio bearers (DRBs). In this way, the network device can further know the DRB-related configuration information of the terminal that is not related to SDT transmission (such as configuration information of non-SDT bearers).

[0057] In some embodiments, acquiring the complete context information of the terminal includes: sending a fourth request message, the fourth request message is used to request to acquire the complete context information of the terminal; and receiving a fourth response message, the fourth response message includes the complete context information of the terminal.

[0058] S103: Modify the current context information of the terminal according to the complete context information of the terminal to obtain modified context information.

[0059] In some embodiments, modifying the current context information of the terminal includes at least one of the following: adding configuration information of the non-SDT DRB of the terminal to the current context information of the terminal; resetting the medium access control (MAC) layer related to the terminal in the network device.

[0060] Resetting the MAC layer related to the terminal in the network device may include deleting and / or adding and / or reducing configuration information of the MAC layer related to the terminal in the network device.

[0061] It is understandable that resetting the MAC layer related to the terminal in the network device can avoid inconsistent MAC layer status with the terminal side, which may cause data transmission errors. For example, when the UE has MBS service, after the UE receives the RRC connection establishment message, the MAC layer will be reset according to the process defined by the relevant protocol. Then, after the network side obtains the complete context information of the terminal, it knows that the UE is configured with MBS service through the MBS session information in the complete context information, and then resets the MAC layer related to the UE in the network device, avoiding service errors caused by inconsistent MAC status between the network side and the UE side.

[0062] In some specific examples, when the terminal and the network device are transmitting SDT data, according to the existing 5G protocol, if the terminal and the network device have small data transmission for MBS services, the terminal will reset the MAC layer after receiving the RRC setup message, and the corresponding network device should also reset the MAC layer related to the terminal on the network side, so as to be consistent with the terminal side. If it is decided to reset the MAC layer, the network device resets the MAC layer related to the terminal.

[0063] In some embodiments, the network device includes a DU and a CU.

[0064] In some embodiments, the distributed unit modifies the current context information of the terminal according to the complete context information of the terminal to obtain modified context information.

[0065] In this way, when the network device is separated into CU and DU, when performing small data transmission, if non-small data transmission data of the terminal is received, the non-small data transmission data of the terminal can be directly transmitted based on the modified context information.

[0066] In some embodiments, the distributed unit modifies the current context information of the terminal by at least adding configuration information of the non-SDT DRB of the terminal to the current context information of the terminal.

[0067] In some embodiments, before the distributed unit modifies the current context information of the terminal according to the complete context information of the terminal, the method further includes: the distributed unit receives a second request message sent by the centralized unit, where the second request message is used to request the distributed unit to modify the current context information of the terminal.

[0068] In some embodiments, before the distributed unit receives the second request message sent by the centralized unit, the distributed unit receives a third request message sent by the centralized unit, and the third request includes at least one of the following: indication information of the arrival of non-small data transmission data, indication information of the end of small data transmission, and indication information of the media access control layer reset; the distributed unit resets the MAC layer related to the terminal in the network device.

[0069] In some embodiments, the third request message is a downlink radio resource control transmission message, and the downlink radio resource control transmission message includes a radio resource control connection establishment request message that needs to be sent to the terminal.

[0070] In this way, before the distributed unit modifies the current context information of the terminal according to the complete context information of the terminal, the distributed unit can first choose whether to reset the MAC layer related to the terminal in the network device.

[0071] In some embodiments, the second request message sent by the centralized unit and received by the distributed unit includes at least one of the following: indication information of arrival of non-small data transmission data, indication information of ending small data transmission, and indication information of medium access control layer reset.

[0072] In some embodiments, when the second request message includes at least one of the following: indication information of the arrival of non-small data transmission data, indication information of the end of small data transmission, indication information of the media access control layer reset, the distributed unit modifying the current context information of the terminal also includes: the distributed unit resetting the MAC layer related to the terminal in the network device.

[0073] In this way, after the distributed unit modifies the current context information of the terminal according to the complete context information of the terminal, the distributed unit can choose whether to reset the MAC layer related to the terminal in the network device.

[0074] S104. Transmit terminal data according to the modified context information.

[0075] The data of the terminal at least includes the non-small data transmission data of the terminal.

[0076] In some embodiments, data of the terminal is transmitted via a radio resource control connection between the terminal and the network device according to the modified context information.

[0077] In some embodiments, the radio resource control connection is established before or after the network device modifies the current context information of the terminal according to the complete context information of the terminal.

[0078] In some embodiments, establishing a wireless resource control connection includes: sending a first request message to the terminal, the first request message is used to request establishment of a wireless resource control connection between the terminal and the network device, the first request message includes second indication information, and the second indication information is used to instruct the terminal to restore the complete context information of the terminal.

[0079] In some embodiments, the second indication information includes at least one of the following: indication information indicating that the radio resource control is restored to a connected state, indication information indicating that non-small data transmission data has arrived, and indication information indicating that small data transmission has ended.

[0080] It is understandable that after the terminal receives the RRC connection establishment request in the relevant process, it needs to re-initiate the RRC connection establishment and service establishment process to the wireless network and the core network, which brings serious delay and data loss problems. Therefore, in this embodiment, the first request message sent by the network side to the terminal includes the second indication information, and the second indication information is used to instruct the terminal to restore (enable) the complete context of the terminal side to avoid the terminal from re-initiating the RRC connection establishment and service establishment process.

[0081] In the disclosed embodiment, as the terminal in the inactive state moves, the terminal will move into the coverage area of ​​the first network device and access the first network device. The first network device is the network device that the terminal in the inactive state is currently accessing, and the first network device is not the anchor network device of the terminal. The second network device is the anchor network device of the terminal (for example, the last serving gNB, also referred to as an old base station), specifically refers to a network device that provides services to the terminal when the terminal enters the inactive state. Among them, the first network device and the second network device are not the same network device. If during the SDT transmission process, when the non-SDT data of the terminal arrives at the second network device and needs to be transmitted to the terminal, the terminal currently needs to perform non-SDT, such as Figure 3 As shown, the operations of the first network device, the second network device, the terminal and the core network can refer to the following steps:

[0082] Step 301 (preparatory step), the terminal is in an RRC inactive state, and its context information is stored in a second network device (e.g., the last serving gNB). During the mobile process, when SDT transmission is required, the second network device sends partial context information of the terminal (including DRB information configured with SDT) to the first network device connected to the terminal. So that the first network device can establish the necessary partial context of the terminal for the SDT of the terminal based on the partial context information of the terminal (i.e., the current context information of the terminal in the following steps). For example, only the DRB information configured with SDT is established.

[0083] Step 302 (preparatory step), after the first network device creates a partial context of the terminal related to the SDT transmission, the second network device will transmit SDT data through the first network device and the terminal (transmit / receive SDT data to / from the terminal), wherein the terminal still remains in the RRC inactive state.

[0084] For example, in uplink SDT data transmission: the terminal sends SDT data to the first network device, the first network device sends the SDT data to the second network device, and the first network device sends the SDT data to the core network.

[0085] For downlink SDT data transmission, the core network sends the SDT data to the second network device, the second network device sends the SDT data to the first network device, and the first network device sends the SDT data to the terminal.

[0086] Step 303: During the SDT data transmission process of the terminal, the second network device receives the non-SDT data of the terminal from the core network, and the second network device caches the non-SDT data.

[0087] Step 304: The first network device receives first indication information sent by the second network device. The first indication information is used to indicate the arrival of non-small data transmission data of the terminal or the end of the small data transmission of the terminal.

[0088] Step 305: The first network device sends a fourth request message to the second network device in response to the first indication information, where the fourth request message is used to request to obtain complete context information of the terminal.

[0089] Step 306: The first network device receives a fourth response message sent by the second network device, where the fourth response message includes complete context information of the terminal.

[0090] Step 307: The first network device sends a first request message (eg, an RRC setup message) to the terminal. The first request message is used to request establishment of a radio resource control connection between the terminal and the network device. The first request message includes second indication information. The second indication information is used to instruct the terminal to restore complete context information of the terminal.

[0091] Step 308: After receiving the first request message, the terminal needs to restore all context information on the terminal side, that is, enable the configuration of the RRC connection state, enter the RRC connection state, and send a first response message (for example, RRCsetup complete message) to the first network device. The first response message is used to determine that the radio resource control connection between the terminal and the network device is established.

[0092] Step 309: The first network device modifies the current context information of the terminal according to the complete context information of the terminal to obtain modified context information.

[0093] Step 310: The first network device and the terminal perform data transmission according to the modified context information, where the data at least includes non-SDT data of the terminal.

[0094] In this example, step 309 may be performed after step 306, that is, may be performed before step 307 and / or step 308, or may be performed simultaneously with step 307 or step 308, and the present disclosure does not limit this. The detailed description of steps 301 to 310 in this example (such as the relevant content of the second indication information, etc.) can also refer to the description in the above embodiments or examples, and will not be repeated here.

[0095] For example, in the case where the first network device includes a CU and a DU, the CU and the DU are connected via an F1 interface. At this time, the impact of the F1 interface between the CU / DU needs to be considered. If during the SDT transmission process, when the non-SDT data of the terminal arrives at the second network device and needs to be transmitted to the terminal, the terminal currently needs to perform non-SDT, such as Figure 4 As shown, the operations of the CU of the first network device (denoted as CU in the figure), the DU of the first network device (denoted as DU in the figure), the second network device, the terminal and the core network can refer to the following steps:

[0096] Step 401, you can refer to Figure 3 Steps 301 to 306 in the example above indicate that the CU of the first network device has obtained the complete context information of the terminal.

[0097] Step 402: The CU creates an RRC connection establishment request message to be sent to the terminal, and encapsulates the message into an RRC message container, and sends the RRC message container (encapsulating the RRC connection establishment request message) to the DU connected to the terminal through the downlink RRC transmission message of the existing F1 interface. The CU determines whether it is necessary to reset the MAC layer related to the terminal. If it is necessary to reset the MAC layer related to the terminal, the downlink RRC transmission message includes at least one of the following: indication information of the arrival of non-small data transmission data, indication information of the end of small data transmission, and indication information of the reset of the media access control layer.

[0098] Step 403 (step 403 is an optional execution step), the DU receives a downlink RRC transmission message. If the downlink RRC transmission message contains at least one of the following: indication information of the arrival of non-small data transmission data, indication information of the end of small data transmission, and indication information of the media access control layer reset, the DU of the first network device resets the MAC layer related to the terminal.

[0099] Step 404: The DU sends the encapsulated message in the RRC message container in the downlink RRC transmission message to the terminal, that is, sends the RRC connection establishment request message to the terminal.

[0100] Step 405: The terminal receives the RRC connection establishment request message, enables the configuration of the RRC connection state, enters the RRC connection state, and sends a first response message (also called an RRC connection establishment completion message) to the DU. The first response message is used to confirm that the RRC connection establishment is complete. The DU receives the first response message sent by the terminal, and the DU does not parse (decode) the message, but encapsulates the message in an RRC message container and sends it to the CU.

[0101] Step 406: CU receives the first response message sent by DU, and CU triggers the terminal text update process, that is, CU sends a second request message to DU based on the complete context information of the terminal received previously, and the second request message is used to request the distributed unit to modify the current context information of the terminal. The second request message may include the complete context information of the terminal, such as the configuration information of other DRBs that need to be established for the terminal that is not configured with SDT.

[0102] Step 407: The DU receives the second request message sent by the CU, and modifies the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information. Modifying the current context information of the terminal at least includes adding the configuration information of the data radio bearer of the non-small data transmission of the terminal to the current context information of the terminal.

[0103] Step 408: DU sends feedback information to CU to feed back the modification result.

[0104] Step 409: The first network device performs data transmission with the terminal entering the RRC connection state according to the modified context information, including non-SDT data transmission.

[0105] In addition, for the detailed description of steps 401 to 409 in this example, reference can be made to the relevant description of the above embodiments or examples, which will not be repeated here.

[0106] In another example, when the first network device includes a CU and a DU, the CU and the DU are connected via an F1 interface. In this case, the impact of the F1 interface between the CU / DU needs to be considered. If during the SDT transmission process, when the non-SDT data of the terminal arrives at the second network device and needs to be transmitted to the terminal, the terminal currently needs to perform non-SDT, such as Figure 5 As shown, the operations of the CU of the first network device (denoted as CU in the figure), the DU of the first network device (denoted as DU in the figure), the second network device, the terminal and the core network can also refer to the following steps (the difference between this example and the previous example is that the time point and method in which the CU instructs the DU to reset the terminal-related MAC layer are different):

[0107] Step 501, (preparatory step), can refer to Figure 3 In steps 301 to 306, the CU of the first network device obtains the complete context information of the terminal.

[0108] Step 502: The CU creates an RRC connection establishment request message to be sent to the terminal, and encapsulates the message into an RRC message container, and sends the RRC message container (encapsulating the RRC connection establishment request message) to the DU connected to the terminal through the downlink RRC transmission message of the existing F1 interface.

[0109] Step 503: The DU sends the encapsulated message in the RRC message container in the downlink RRC transmission message to the terminal, that is, sends the RRC connection establishment request message to the terminal.

[0110] Step 504: The terminal receives the RRC connection establishment request message, enables the configuration of the RRC connection state, enters the RRC connection state, and sends a first response message (also called an RRC connection establishment completion message) to the DU. The first response message is used to confirm that the RRC connection establishment is complete. The DU receives the first response message sent by the terminal, and the DU does not parse the message, but encapsulates the message in an RRC message container and sends it to the CU.

[0111] Step 505: CU receives the first response message sent by DU, and CU triggers the terminal text update process, that is, CU sends a second request message to DU based on the complete context information of the terminal received previously, and the second request message is used to request the distributed unit to modify the current context information of the terminal. Among them, CU decides whether it is necessary to reset the MAC layer related to the terminal. If it is necessary to reset the MAC layer related to the terminal, the second request message includes at least one of the following: indication information of the arrival of non-small data transmission data, indication information of the end of small data transmission, and indication information of the reset of the media access control layer.

[0112] Step 506: The DU receives the second request message sent by the CU and modifies the current context information of the terminal. Modifying the current context information of the terminal at least includes adding the configuration information of the data radio bearer of the non-small data transmission of the terminal to the current context information of the terminal.

[0113] If the second request message includes at least one of the following: indication information of arrival of non-small data transmission data, indication information of ending small data transmission, indication information of medium access control layer reset, the DU resets the terminal-related MAC layer.

[0114] Step 507: DU sends feedback information to CU to feedback the modification result.

[0115] Step 508: The first network device performs data transmission with the terminal entering the RRC connection state according to the modified context information, including non-SDT data transmission.

[0116] In addition, for the detailed description of steps 501 to 508 in this example, reference can be made to the relevant description of the above embodiments or examples, which will not be repeated here.

[0117] Based on this, when performing small data transmission, if non-small data transmission data of the terminal is received, the non-small data transmission data of the terminal can be directly transmitted based on the modified context information. This avoids the delay and increased signaling load of the air interface caused by the network side releasing the terminal to the RRC INACTIVE state or RRC IDLE state and re-paging the terminal before transmitting the non-small data transmission data of the terminal. This improves the data transmission efficiency.

[0118] It is understandable that in the above embodiments or examples, before SDT data transmission, the first network device will first obtain partial context information of the UE related to SDT from the second network device, such as the bearer configuration supporting SDT. After obtaining the partial context information of the UE, the first network device can perform SDT data transmission with the UE according to the bearer configuration supporting SDT. If there is non-SDT data to be transmitted to the UE, the first network device will re-apply to the second network device for the complete context information of the UE.

[0119] However, if the UE is configured with the MBS service, the UE may also receive broadcast MBS data from the first network device during the SDT data transmission phase (if the current cell of the UE of the first network device supports broadcast MBS data). However, according to the relevant steps, the first network device only has partial context information of the UE at this time, and the first network device does not know that the UE is receiving broadcast or multicast data of MBS. This may cause the first network device to use the hybrid automatic repeat request process (HARQ) used by the UE to receive MBS data when scheduling the SDT data to be sent to the UE, resulting in the UE receiving MBS data packet loss or SDT data packet loss.

[0120] Based on this, the present disclosure provides a method for solving the problem that, in the relevant process, when an inactive UE is configured with an MBS service, after the first network device triggers SDT data transmission, data transmission between the UE and the first network device may be lost. Figure 6 As shown, the method comprises the following steps:

[0121] In the preparatory step, the UE is in an RRC inactive state, and the complete context information of the UE (including SDT-related context information and MBS-related context information) is stored in the second network device. During the mobile process, when SDT data transmission is required with the UE, according to the relevant process, the first network device to which the UE is currently connected needs to obtain part of the SDT-related context information from the second network device for SDT data transmission.

[0122] Step 601: The first network device sends a UE context acquisition request message to the second network device, including SDT indication information defined in the relevant protocol flow, where the SDT indication information is used to indicate the acquisition of SDT-related context information. The message may also include MBS support indication information, where the MBS support indication information is used to indicate that the cell currently connected to the UE supports MBS services.

[0123] Step 602: The second network device checks the stored complete context information of the UE, and determines whether the UE is configured with the MBS service according to whether the complete context information of the UE includes the MBS session configuration information.

[0124] Step 603: If the UE context acquisition request message received by the second network device includes MBS support indication information, and the second network device determines that the current UE is configured with MBS service, the second network device sends feedback information to the first network device, wherein the feedback information includes the complete context information of the UE, or SDT-related context information and MBS-related context information. (Different from the related process, in the related process, if the message received by the second network device includes SDT indication, the second network device will only feedback the context information related to SDT to the first network device).

[0125] In some embodiments, in step 601, the UE context acquisition request message sent by the first network device only includes the SDT indication. In step 603, after the second network device receives the UE context acquisition request message, if it is determined that the current UE is configured with an MBS service, the second network device sends feedback information to the first network device according to the relevant process, and the feedback information only includes context information related to the SDT, and the feedback information may also include an MBS session ID (identifier) ​​or an MBS service indication, which is used to indicate that the UE is configured with an MBS service. Or the first network device sends a UE context acquisition failure response message to the second network device, and the response message includes an MBS session ID or an MBS service indication, which is used to indicate that the UE is configured with an MBS service. The first network device receives the feedback information of the second network device, and if the feedback information includes an MBS session ID or an MBS service indication, the first network device resends the UE context acquisition request message to the second network device, wherein the message does not include an SDT indication, and the second network device returns the complete context information of the UE to the first network device in the subsequent feedback information.

[0126] Step 604: After receiving the feedback information, the first network device saves the complete context information of the UE, or the context information related to the SDT and the context information related to the MBS contained in the feedback information. The first network device configures and / or establishes a bearer related to the SDT according to the context information related to the SDT, transmits the SDT data, and transmits the MBS data between the UE and the first network device according to the context information related to the MBS.

[0127] Also shown below is a data transmission device for executing the data transmission method in any of the above embodiments and possible implementations thereof. It is understandable that, in order to implement the data transmission method, the data transmission device includes hardware structures and / or software modules corresponding to the execution of various functions; those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiments of the present disclosure, the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present disclosure.

[0128] The embodiments of the present disclosure may divide the data transmission device into functional modules according to the above method embodiments. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one functional module. The above integrated modules may be implemented in the form of hardware or software. It should be noted that the division of modules in the embodiments of the present disclosure is schematic and is only a logical function division. There may be other division methods in actual implementation. The following is an example of dividing each functional module corresponding to each function.

[0129] Figure 7 1 is a schematic diagram of a data transmission device provided by an embodiment of the present disclosure, which is applied to a network device. The data transmission device 700 includes: a communication module 701 , an acquisition module 702 and a processing module 703 .

[0130] Wherein, the communication module 701 is used to receive first indication information, where the first indication information is used to indicate the arrival of non-small data transmission data of the terminal or the end of the small data transmission of the terminal;

[0131] An acquisition module 702, configured to acquire complete context information of a terminal in response to the first indication information;

[0132] The processing module 703 is used to modify the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information;

[0133] The communication module 701 is further configured to transmit the data of the terminal according to the modified context information, where the data of the terminal at least includes the non-small data transmission data of the terminal.

[0134] In some embodiments, the communication module 701 is specifically used to:

[0135] According to the modified context information, the data of the terminal is transmitted through the radio resource control connection between the terminal and the network device.

[0136] In some embodiments, the radio resource control connection is established before or after the network device modifies the current context information of the terminal according to the complete context information of the terminal.

[0137] In some embodiments, the radio resource control connection establishment includes:

[0138] A first request message is sent to the terminal, where the first request message is used to request establishment of a radio resource control connection between the terminal and the network device, and the first request message includes second indication information, where the second indication information is used to instruct the terminal to restore complete context information of the terminal.

[0139] In some embodiments, the second indication information includes at least one of the following: indication information indicating that the radio resource control is restored to a connected state, indication information indicating that non-small data transmission data has arrived, and indication information indicating that small data transmission has ended.

[0140] In some embodiments, modifying the current context information of the terminal includes at least one of the following:

[0141] Adding configuration information of a data radio bearer for non-small data transmission of the terminal to the current context information of the terminal;

[0142] Reset the media access control layer associated with the terminal in the network device.

[0143] In some embodiments, the processing module 703 is located in a distributed unit in the network device, and the processing module 703 is used to modify the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information.

[0144] In some embodiments, the processing module 703 is located in a distributed unit in the network device, and the processing module 703 is specifically used to: modify the current context information of the terminal by at least adding the configuration information of the data wireless bearer of the terminal's non-small data transmission in the current context information of the terminal.

[0145] In some embodiments, the processing module 703 is located in a distributed unit in a network device, and the network device also includes a centralized unit. The processing module 703 is also used to receive a second request message sent by the centralized unit, and the second request message is used to request the distributed unit to modify the current context information of the terminal.

[0146] In some embodiments, the processing module 703 is located in a distributed unit in a network device, and the network device includes a centralized unit. The processing module 703 is specifically used to:

[0147] Receive a third request message sent by the centralized unit, wherein the third request includes at least one of the following: indication information of arrival of non-small data transmission data, indication information of ending small data transmission, and indication information of a media access control layer reset;

[0148] Reset the media access control layer related to the terminal in the network device.

[0149] In some embodiments, the third request message is a downlink radio resource control transmission message, and the downlink radio resource control transmission message includes a radio resource control connection establishment request message that needs to be sent to the terminal.

[0150] In some embodiments, the second request message includes at least one of the following: indication information of arrival of non-small data transmission data, indication information of ending small data transmission, and indication information of medium access control layer reset.

[0151] In some embodiments, the processing module 703 is located in a distributed unit in a network device, and the processing module 703 is further configured to reset a media access control layer related to the terminal in the network device.

[0152] For a more detailed description of the above-mentioned communication module 701, acquisition module 702 and processing module 703, as well as a more detailed description of each technical feature therein, and a description of the beneficial effects, etc., please refer to the above-mentioned corresponding method embodiment part, which will not be repeated here.

[0153] It should be noted that Figure 7 The modules in the communication module may also be referred to as units. For example, the communication module may be referred to as a communication unit. Figure 7 In the illustrated embodiment, the names of the modules may not be the names shown in the figure. For example, the communication module may also be called a sending module or a receiving module.

[0154] Figure 7If the various units or modules in the embodiment are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present disclosure 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. The computer software product is stored in a storage medium, including several 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 various embodiments of the present disclosure. The storage medium for storing computer software products includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0155] In the case of implementing the functions of the above-mentioned integrated modules in the form of hardware, the embodiment of the present disclosure also provides a possible structure of a communication device, which is used to execute the data transmission method provided by the embodiment of the present disclosure. Figure 8 As shown, the communication device 800 includes: a communication interface 803, a processor 802 and a bus 804. Optionally, the communication device may further include a memory 801.

[0156] The processor 802 may be a processor that implements or executes various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of the present disclosure. The processor 802 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of the present disclosure. The processor 802 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0157] The communication interface 803 is used to connect with other devices via a communication network, such as Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0158] The memory 801 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0159] As a possible implementation, the memory 801 may exist independently of the processor 802, and the memory 801 may be connected to the processor 802 via a bus 804 to store instructions or program codes. When the processor 802 calls and executes the instructions or program codes stored in the memory 801, the data transmission method provided in the embodiment of the present disclosure can be implemented.

[0160] In another possible implementation, the memory 801 may also be integrated with the processor 802 .

[0161] The bus 804 may be an extended industry standard architecture (EISA) bus, etc. The bus 804 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0162] Some embodiments of the present disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium), which stores computer program instructions. When the computer program instructions are executed on a computer, the computer executes the data transmission method described in any of the above embodiments.

[0163] In an exemplary embodiment, the computer may be the above-mentioned data transmission device, and the present disclosure does not limit the specific form of the computer.

[0164] In some examples, the computer-readable storage media described above may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or tapes, etc.), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), cards, sticks, or key drives, etc.). The various computer-readable storage media described in the present disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0165] An embodiment of the present disclosure provides a computer program product including instructions. When the computer program product is run on a computer, the computer is enabled to execute the data transmission method described in any one of the above embodiments.

[0166] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A data transmission method, characterized in that: Applied to a network device, the method comprises: Receive first indication information, where the first indication information is used to indicate the arrival of non-small data transmission data of a terminal or the end of small data transmission of the terminal; acquiring complete context information of the terminal in response to the first indication information; Modifying the current context information of the terminal according to the complete context information of the terminal to obtain modified context information; The data of the terminal is transmitted according to the modified context information, wherein the data of the terminal at least includes non-small data transmission data of the terminal.

2. The method according to claim 1, characterized in that The transmitting the data of the terminal according to the modified context information includes: According to the modified context information, data of the terminal is transmitted through a radio resource control connection between the terminal and the network device.

3. The method according to claim 2, characterized in that The radio resource control connection is established before or after the network device modifies the current context information of the terminal according to the complete context information of the terminal.

4. The method according to claim 3, characterized in that The radio resource control connection establishment includes: A first request message is sent to the terminal, where the first request message is used to request establishment of a radio resource control connection between the terminal and the network device, and the first request message includes second indication information, where the second indication information is used to instruct the terminal to restore the complete context information of the terminal.

5. The method according to claim 4, characterized in that The second indication information includes at least one of the following: indication information indicating that the radio resource control is restored to a connected state, indication information indicating that non-small data transmission data has arrived, and indication information indicating that small data transmission has ended.

6. The method according to claim 1, characterized in that The modifying the current context information of the terminal includes at least one of the following: Adding configuration information of a data radio bearer for non-small data transmission of the terminal to the current context information of the terminal; Reset the media access control layer related to the terminal in the network device.

7. The method according to claim 1, characterized in that The network device includes a distributed unit, and the modifying the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information includes: The distributed unit modifies the current context information of the terminal according to the complete context information of the terminal to obtain modified context information.

8. The method according to claim 7, characterized in that The modifying the current context information of the terminal at least includes adding configuration information of a data radio bearer for non-small data transmission of the terminal to the current context information of the terminal.

9. The method according to claim 8, characterized in that The network device further includes a centralized unit, and before the distributed unit modifies the current context information of the terminal according to the complete context information of the terminal, further includes: The distributed unit receives a second request message sent by the centralized unit, where the second request message is used to request the distributed unit to modify current context information of the terminal.

10. The method according to claim 9, characterized in that Before the distributed unit receives the second request message sent by the centralized unit, the method further includes: The distributed unit receives a third request message sent by the centralized unit, wherein the third request includes at least one of the following: indication information of arrival of non-small data transmission data, indication information of ending small data transmission, and indication information of a media access control layer reset; The distributed unit resets a media access control layer related to the terminal in the network device.

11. The method according to claim 10, characterized in that The third request message is a downlink radio resource control transmission message, and the downlink radio resource control transmission message includes a radio resource control connection establishment request message that needs to be sent to the terminal.

12. The method according to claim 9, characterized in that The second request message includes at least one of the following: indication information of arrival of non-small data transmission data, indication information of ending small data transmission, and indication information of medium access control layer reset.

13. The method according to claim 12, characterized in that The modifying the current context information of the terminal further includes: Reset the media access control layer related to the terminal in the network device.

14. A communication device, characterized in that: include: Memory and processor; Memory and processor coupling; The memory is used to store instructions executable by the processor; When the processor executes the instructions, the method according to any one of claims 1 to 13 is performed.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a communication device, the communication device is caused to execute the method according to any one of claims 1 to 13.

16. A computer program product, characterized in that When the computer program product is executed, the method according to any one of claims 1 to 13 is implemented.

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