Data transmission method, communication apparatus, storage medium and program product

Abstract

Provided are a data transmission method, a communication device, a storage medium and a program product. The data transmission method comprises: receiving first indication information, wherein the first indication information is used for indicating the arrival of non-small data transmission data of a terminal or the termination of small data transmission of the terminal; acquiring complete context information of the terminal in response to the first indication information; modifying current context information of the terminal on the basis of the complete context information of the terminal, so as to obtain modified context information; and transmitting data of the terminal on the basis of the modified context information, wherein the data of the terminal comprises at least the non-small data transmission data of the terminal.

Description

Data transmission method, communication device, storage medium and program product

[0001] The present disclosure claims priority to Chinese Patent Application No. 202411135039.4, filed on August 16, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the field of communication technology, and in particular, to a data transmission method, a communication device, a storage medium and a program product. BACKGROUND

[0003] In a 5th generation mobile communication technology (5G) system, when non-small data transmission (SDT) data arrives at the network side and needs to be transmitted to the UE during the transmission process of the SDT of the user equipment (UE) and the network side, the network side needs to re-release the UE to the radio resource control (RRC) inactive (INACTIVE) state or the RRC idle (IDLE) state and re-paging the UE, which causes a serious time delay problem for terminal data transmission and increases the signaling load of the air interface. SUMMARY

[0004] In one aspect, the present disclosure provides a data transmission method, executed by a network device. The data transmission method comprises:

[0005] receiving first indication information, the first indication information being used to indicate that non-SDT data of a terminal arrives or ends SDT of the terminal;

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

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

[0008] transmitting data of the terminal according to the modified context information, the data of the terminal at least including the non-SDT data of the terminal.

[0009] In another aspect, the present disclosure provides a data transmission device, applied to a network device. The data transmission device comprises a communication module, an obtaining module and a processing module.

[0010] The communication module is configured to receive first indication information, and the first indication information is used to indicate that non-small data transmission data of the terminal arrives or ends small data transmission of the terminal.

[0011] The acquisition module is configured to acquire complete context information of the terminal in response to the first indication information.

[0012] The processing module is configured to modify the current context information of the terminal according to the complete context information of the terminal to obtain modified context information.

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

[0014] In another aspect, the embodiments of the present disclosure provide a communication device. The communication device includes a memory and a processor, the memory and the processor are coupled, the memory is configured to store computer program instructions executable by the processor, and the processor implements the data transmission method of any of the above aspects when executing the computer program instructions.

[0015] In another aspect, the embodiments of the present disclosure provide a computer readable storage medium, and the computer readable storage medium stores computer program instructions, and the computer program instructions implement the data transmission method of any of the above aspects when running on a computer (for example, a data transmission device).

[0016] In another aspect, the embodiments of the present disclosure provide a computer program product, and the computer program product includes computer program instructions, and the computer program instructions implement the data transmission method of any of the above aspects when executed. BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is a structural schematic diagram of a communication system according to some embodiments.

[0018] FIG. 2 is a flowchart of a data transmission method according to some embodiments.

[0019] FIG. 3 is an interactive flowchart of a data transmission method according to some embodiments.

[0020] FIG. 4 is an interactive flowchart of another data transmission method according to some embodiments.

[0021] FIG. 5 is an interactive flowchart of another data transmission method according to some embodiments.

[0022] FIG. 6 is an interactive flowchart of another data transmission method according to some embodiments.

[0023] FIG. 7 is a structural schematic diagram of a data transmission device according to some embodiments.

[0024] FIG. 8 is a structural diagram of a communication device according to some embodiments. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0026] It should be understood that the described embodiments are merely used to explain the present disclosure, and are not used to limit the present disclosure.

[0027] In the following description, the suffixes such as "module", "part", or "unit" used for an element are merely intended for facilitating explanation of the present disclosure, and are by no means specific to the present disclosure, and thus, "module", "part", or "unit" can be mixedly used.

[0028] In the description of the present disclosure, unless otherwise stated, " / " means "or", for example, A / B can mean A or B. "And / or" in the present disclosure means that there can be three kinds of relationships, for example, A and / or B can mean only A, A and B, and only B. In addition, "at least one" means one or more, and "multiple" means two or more. "First", "second", and the like do not limit the number and execution order, and "first", "second", and the like do not necessarily mean different.

[0029] Unless otherwise required by the context, throughout the specification and claims, the term "comprise" and other forms such as "comprises" and "comprising", for example, the third person singular form "comprises" and the present participle form "comprising", are interpreted to be open, inclusive meanings, i.e., "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 mean that a particular feature, structure, material, or characteristic related to the embodiment or example includes in at least one embodiment or example of the present disclosure. The illustrative representation of the above terms does not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described can be included in any one or more embodiments or examples in any appropriate manner.

[0030] The terms "first", "second", etc. are used only for the purpose of description and are not to be interpreted as indicating or implying relative importance or a number of indicated technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0031] In the embodiments of the present disclosure, the expressions such as "exemplarily" or "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplarily" or "for example" in the embodiments of the present disclosure should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the expressions such as "exemplarily" or "for example" are intended to present the relevant concept in a detailed manner.

[0032] In addition, the use of "based on" means open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values can be based on additional conditions or beyond the stated values in practice.

[0033] In a communication system, a terminal can be in any one of the following RRC states: idle state, inactive state, and connected state. When the terminal is in the connected state, the terminal performs data transmission with a network device. When the terminal is in the idle state or the inactive state, the terminal generally does not perform data transmission with the network side.

[0034] When the terminal enters the inactive state, the base station providing services for the terminal is referred to as an anchor base station, and the terminal has mobility. When the terminal in the inactive state moves to the coverage of a base station other than the anchor base station, and data transmission is needed between the terminal and the network side, the base station other than the anchor base station obtains the context information of the terminal from the anchor base station, and then the terminal requests RRC connection recovery to the base station other than the anchor base station to enter the connected state to perform data transmission.

[0035] In one case, in order to reduce the latency of data transmission, when the terminal is in the inactive state, the terminal is allowed to perform SDT with the base station. SDT means that when the data amount of to-be-transmitted data is less than a certain threshold, or the number of data packets of to-be-transmitted data is less than a certain number, the terminal can maintain in the inactive state without entering the connected state to perform transmission of the to-be-transmitted data between the terminal and the network side.

[0036] With the development of intelligent terminals and Internet of Things terminals, the user quantity of some instant messaging services, such as WeChat, Twitter, QQ message and the like, is increasing. Such services are usually always online, and the users mainly perform small data transmission, such as text messages, when using the services. Since the small data volume service needs the UE to frequently perform signaling link reconstruction with the network side, the signaling load of the network side is increased and the like.

[0037] In 4G, in order to optimize the support for infrequent small data transmission, the 4G network supports that, when the UE accesses the random access channel (RACH), the UE can carry corresponding small data transmission to the network side in the RACH access request message or the RRC connection establishment request message. In this way, the UE can transmit occasional SDT data without frequently performing signaling link reconstruction with the network side.

[0038] The RRC state of 4G LTE has only two kinds: RRC idle state and RRC connected state, and the 5G introduces an RRC inactive state. In the RRC INACTIVE state, the UE is in a power-saving sleep state, but the UE still retains the context information of the network side, and the network side also retains the context (UE context) information of the UE side. In this way, the UE can quickly transfer from the RRC INACTIVE state to the RRC CONNECTED state and perform data transmission when there is data transmission. This can reduce signaling overhead, can quickly access, reduce latency, and can also save power.

[0039] However, for small data transmission, the 5G also supports the UE to remain in the RRC INACTIVE state without entering the RRC CONNECTED state to perform data transmission with the network side. The 5G SDT includes RACH-based SDT and CG resource-based SDT. In the case that the UE is configured with the CG resource in the RRC INACTIVE state, the UE can use the CG resource to perform SDT in the RRC INACTIVE state. However, the signal quality of the CG resource of the UE may not be good, and in this case, the UE may use the RACH access process to perform SDT in the RRC INACTIVE state even if the CG resource is configured.

[0040] In the current 5G system, when the UE and the network side are performing SDT, it is possible that the network side receives non-SDT data of the UE from the core network (CN), for example, other data radio bearer (DRB) data that does not support SDT configuration. At this time, according to the relevant process, the network side first needs to re-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 side re-paginates the UE, and if the paging is successful, the network side sends an RRC message to the UE, instructing the UE to enter or resume the RRC CONNECTED state, and only after the UE enters the RRC CONNECTED state can the network side perform subsequent data transmission with the UE, such as transmitting non-SDT data. In this process, when non-SDT data arrives at the network side and needs to be transmitted to the UE during SDT transmission, the network side needs to re-release the UE to the RRC INACTIVE state or the RRC IDLE state and re-paginate the UE, which causes serious latency problems for terminal data transmission and increases the signaling load of the air interface.

[0041] In view of this, the present disclosure provides a data transmission method, by receiving first indication information, the first indication information is used to indicate that the non-small data transmission data of the terminal arrives or ends the small data transmission of the terminal; in response to the first indication information, the complete context information of the terminal is obtained; according to the complete context information of the terminal, the current context information of the terminal is modified to obtain the modified context information; according to the modified context information, the data of the terminal is transmitted, and the data of the terminal at least includes the non-small data transmission data of the terminal.

[0042] In this way, when performing small data transmission, if the network side receives non-small data transmission data of the terminal, the network side can directly transmit the non-small data transmission data of the terminal based on the modified context information, avoiding the problem that the network side needs to re-release the terminal to the RRC INACTIVE state or the RRC IDLE state, and then re-paginate the terminal before transmitting the non-small data transmission data of the terminal, thereby solving the latency and increasing the signaling load of the air interface, and improving the data transmission efficiency.

[0043] The technical solutions 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, a future mobile communication network such as a 5G-A system, a 6G wireless system, and a variety of communication convergence systems, for example, a global system for mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA), a general packet radio service (GPRS) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a long term evolution advanced (LTE-A) system, a universal mobile telecommunications system (UMTS), a worldwide interoperability for microwave access (WiMAX) system, and the like, which include terminal devices and network devices in the various systems. In some embodiments, the various systems can also include a core network part, for example, an Evloved Packet System (EPS), a 5G system (5GS), and the like, which are not limited by the embodiments of the present disclosure.

[0044] FIG. 1 is a schematic diagram of a structure of a communication system according to some embodiments. As shown in FIG. 1, the communication system includes a terminal 110 and a plurality of network devices, and the embodiments are exemplified by taking 1 terminal and 2 network devices (network device 120 and network device 130) as an example. When the terminal 110 enters an 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 an anchor network device of the terminal. As the terminal 110 moves, the terminal 110 will move into the coverage of the network device 130 and access the network device 130. At this time, the anchor network device of the terminal and the network device currently accessed by the terminal are not the same network device. In the following embodiments, the network device 120 can also be referred to as a second network device (in the case of a base station as the second network device, the base station can be referred to as an old base station, etc.), and the network device 130 can also be referred to as a first network device (in the case of a base station as the first network device, the base station can be referred to as a new base station, etc.).

[0045] The network device involved in the embodiments of the present disclosure can be a base station. The base station can include multiple cells serving terminals. According to different application scenarios, the base station can also be referred to as an access point or other names. The base station can be a device in an access network that communicates with wireless terminals through one or more sectors over the air interface. The network device can be used to exchange received air frames and Internet Protocol (IP) packets as a router between wireless terminals and the rest of the access network, which can include an Internet Protocol (IP) communication network. The network device can also coordinate the management of the properties of the air interface. For example, the network device involved in the embodiments of the present disclosure can be a base transceiver station (BTS) in the global system for mobile communications (GSM) or code division multiple access (CDMA), or a network device (NodeB) in wide-band code division multiple access (WCDMA), or an evolved network device (eNB or e-NodeB) in a long term evolution (LTE) system, or a 5G base station (gNB) in a 5G network architecture, or a home evolved Node B (HeNB), a relay node, a femto, a pico, etc., which are not limited in the embodiments of the present disclosure. In some network structures, the network device can include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit can also be geographically separated. For example, a base station can include one CU and multiple DUs, and the CU and the DU are connected through an F1 interface.

[0046] In the disclosure, a terminal is a device with wireless transceiving function, which can be deployed on land, including indoor or outdoor; can also be deployed on water surface (such as ships, etc.); can also be deployed in the air (such as airplanes, balloons and satellites, etc.), and can also be a device providing voice and / or data connectivity to users, a handheld device with wireless connection function, or other processing devices connected to a wireless modem, etc. The terminal can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiving 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 disclosure do not limit the application scenarios. The terminal can also be referred to as a user, a user equipment, an access terminal, a UE unit, a UE station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a UE terminal, a wireless communication device, a UE agent or a UE apparatus, etc. The embodiments of the disclosure do not limit.

[0047] It should be understood that FIG. 1 is an exemplary structural diagram, and the number of devices included in the communication system shown in FIG. 1 is not limited, for example, the number of network devices and terminals is not limited. In addition, the communication system shown in FIG. 1 can also include other devices in addition to the devices shown in FIG. 1, and the embodiments of the disclosure do not limit this.

[0048] The application scenarios of the embodiments of the disclosure are not limited. The system architecture and business scenarios described in the embodiments of the disclosure are for more clearly illustrating the technical solutions of the embodiments of the disclosure, and do not constitute a limitation on the technical solutions provided by the embodiments of the disclosure. Those skilled in the art can know that, with the evolution of network architecture and the appearance of new business scenarios, the technical solutions provided by the embodiments of the disclosure are also applicable to similar technical problems.

[0049] The embodiments of the disclosure provide a data transmission method, applied to a network device. As shown in FIG. 2, the method comprises S101 to S104.

[0050] S101, receiving first indication information.

[0051] The first indication information is used to indicate that the non-SDT data of the terminal arrives or the SDT of the terminal ends.

[0052] S102, acquire complete context information of the terminal in response to the first indication information.

[0053] The complete context information of the terminal includes remaining context information of the terminal in addition to current context information of the terminal. The current context information of the terminal can also be referred to as partial context information of the terminal, and the present disclosure does not limit this.

[0054] In some embodiments, the current context information of the terminal is used by the network device to send uplink SDT data of the terminal to other network devices (for example, the first network device to the second network device described above) and / or to send downlink SDT data of the terminal to the terminal. In some embodiments, the current context information of the terminal includes configuration information of a bearer, such as configuration information of a bearer of at least one SDT. The bearer of the at least one SDT can be a bearer of all SDTs of the terminal, or a bearer of part of the SDTs of the terminal. The bearer of the SDT, such as a data radio bearer (DRB) of the SDT.

[0055] 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 the related bearers, MAC layer configuration information of the related bearers, protocol data unit (PDU) session information and multicast broadcast service (MBS) session information corresponding to the bearers, and the like. The complete context information of the terminal can also be referred to the description in the related protocol (for example, the 3GPP protocol). The non-SDT bearer, such as a data radio bearer (DRB) of the non-SDT. In this way, the network device can further know the DRB related configuration information (for example, the configuration information of the non-SDT bearer) of the terminal that is not related to the SDT transmission.

[0056] In some embodiments, acquiring the complete context information of the terminal includes: sending a fourth request message, the fourth request message being used to request to acquire the complete context information of the terminal; and receiving a fourth response message, the fourth response message including the complete context information of the terminal.

[0057] S103, modify the current context information of the terminal according to the complete context information of the terminal to obtain modified context information.

[0058] In some embodiments, the current context information of the terminal is modified, including at least one of the following: adding configuration information of a non-SDT DRB of the terminal in the current context information of the terminal; resetting a medium access control (MAC) layer related to the terminal in the network device.

[0059] The resetting of the MAC layer related to the terminal in the network device can include deleting and / or adding and / or reducing configuration information of the MAC layer related to the terminal in the network device.

[0060] It can be understood that the resetting of the MAC layer related to the terminal in the network device can avoid the inconsistency of the MAC layer state on the terminal side, which can 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 in 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 the MAC layer related to the UE in the network device can be reset to avoid the inconsistency of the MAC state between the network side and the UE side, which can cause service errors.

[0061] In some examples, when the terminal and the network device are in the SDT data transmission period, if the terminal and the network device have small data transmission of MBS service, the terminal will reset the MAC layer after receiving the RRC setup message according to the existing 5G protocol, and the corresponding network device should also reset the MAC layer related to the terminal in the network side, so as to keep consistent with the terminal. If it is decided to reset the MAC layer, the network device resets the MAC layer related to the terminal.

[0062] In some embodiments, the network device includes a DU and a CU.

[0063] 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.

[0064] In this way, in the case where the network device is separated into a CU and a DU, when small data transmission is performed, 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.

[0065] In some embodiments, the distributed unit modifies the current context information of the terminal at least by adding configuration information of a non-SDT DRB of the terminal in the current context information of the terminal.

[0066] 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 distributed unit further receives 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.

[0067] 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 message contains 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 resetting of a medium access control layer, and resetting of the MAC layer related to the terminal in the network device by the distributed unit.

[0068] 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.

[0069] 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 select whether to reset the MAC layer related to the terminal in the network device.

[0070] In some embodiments, the second request message sent by the centralized unit to the distributed unit contains 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 resetting of a medium access control layer.

[0071] In some embodiments, when the second request message contains 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 resetting of a medium access control layer, the distributed unit modifies the current context information of the terminal according to the complete context information of the terminal further includes: resetting of the MAC layer related to the terminal in the network device by the distributed unit.

[0072] 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 select whether to reset the MAC layer related to the terminal in the network device.

[0073] S104, transmitting data of the terminal according to the modified context information.

[0074] The data of the terminal at least includes non-small data transmission data of the terminal.

[0075] In some embodiments, according to the modified context information, the data of the terminal is transmitted through a radio resource control connection between the terminal and the network device.

[0076] In some embodiments, the radio resource control connection establishment is before or after the network device modifies the current context information of the terminal according to the complete context information of the terminal.

[0077] In some embodiments, the radio resource control connection establishment comprises: sending a first request message to the terminal, the first request message being used to request to establish a radio resource control connection between the terminal and the network device, and the first request message containing second indication information, the second indication information being used to instruct the terminal to restore the complete context information of the terminal.

[0078] In some embodiments, the second indication information comprises at least one of the following: indication information of resuming the radio resource control to the connected state, indication information of arrival of non-small data transmission data, and indication information of ending small data transmission.

[0079] It can be understood that after the terminal receives the RRC connection establishment request in the related process, the terminal needs to re-initiate the RRC connection establishment and service establishment process to the wireless network and the core network, thereby causing large time delay and serious data loss problem. In the embodiment, the first request message sent by the network to the terminal contains the second indication information, and the second indication information is used to instruct the terminal to restore (enable) the complete context information of the terminal, thereby avoiding the terminal to re-initiate the RRC connection establishment and service establishment process.

[0080] In the embodiment of the disclosure, with the movement of the terminal in the inactive state, the terminal moves into the coverage range of the first network device and accesses the first network device. The first network device is the network device currently accessed by the terminal in the inactive state, and the first network device is not the anchor network device of the terminal, and the second network device is the anchor network device (such as the last serving gNB, also called the old base station) of the terminal, for example, the second network device refers to the network device serving the terminal when the terminal enters the inactive state. The first network device and the second network device are not the same network device. If during the SDT data transmission, when the non-SDT data of the terminal arrives at the second network device and needs to be transmitted to the terminal, the terminal needs to perform non-SDT at present, as shown in FIG. 3, the operations of the first network device, the second network device, the terminal and the core network can be performed: steps 301 to 310.

[0081] Step 301 (preparation step), the terminal is in an RRC inactive state, and context information of the terminal is saved in a second network device (for example, a last serving gNB). During the moving process, when SDT transmission is needed, the second network device sends part of the context information of the terminal (including DRB information configured with SDT) to a first network device connected with the terminal, so that the first network device establishes necessary part of the context of the terminal for the SDT of the terminal according to the part of the context information of the terminal (that is, the current context information of the terminal in the following steps), for example, only establishes the DRB information configured with the SDT.

[0082] Step 302 (preparation step), after the first network device creates the part of the context information related to the SDT transmission of the terminal, the second network device transmits the SDT data through the first network device and the terminal (transmits / receives the SDT data to / from the terminal), and the terminal still remains in the RRC inactive state.

[0083] As the uplink SDT data transmission: the terminal sends the 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.

[0084] As the 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.

[0085] Step 303, during the SDT data transmission of the terminal, the second network device receives non-SDT data of the terminal from the core network, and the second network device buffers the non-SDT data.

[0086] Step 304, the first network device receives the first indication information sent by the second network device. The first indication information is used to indicate that the non-small data transmission data of the terminal arrives or ends the small data transmission of the terminal.

[0087] Step 305, the first network device sends a fourth request message to the second network device in response to the first indication information, and the fourth request information is used to request to obtain the complete context information of the terminal.

[0088] Step 306, the first network device receives the fourth response message sent by the second network device, and the fourth response message includes the complete context information of the terminal.

[0089] Step 307, the first network device sends first request information (for example, an RRC setup message) to the terminal, the first request information is used to request to establish a radio resource control connection between the terminal and the network device, and the first request information contains second indication information, the second indication information is used to instruct the terminal to restore the complete context information of the terminal.

[0090] Step 308, after receiving the first request information, the terminal needs to restore the complete context information of the terminal side, that is, to enable the configuration of the RRC connected state, and enter the RRC connected state, and send first response information (for example, an RRC setup complete message) to the first network device, the first response information is used to determine that the establishment of the radio resource control connection between the terminal and the network device is completed.

[0091] Step 309, the first network device modifies the current context information of the terminal according to the complete context information of the terminal, and obtains modified context information.

[0092] Step 310, the first network device and the terminal perform data transmission according to the modified context information, and the data at least includes non-SDT data of the terminal.

[0093] In the example, step 309 can be performed after step 306, that is, can be performed before step 307 and / or step 308, or can 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 the example (for example, the related content of the second indication information) can also refer to the description in the above embodiments or examples, which will not be repeated here.

[0094] Exemplarily, in the case where the first network device includes a CU and a DU, the CU and the DU are connected through an F1 interface. At this time, the influence of the F1 interface between the CU / DU also needs to be considered. If during the SDT transmission, 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, as shown in FIG. 4, the CU of the first network device (denoted as CU in FIG. 4), the DU of the first network device (denoted as DU in FIG. 4), the second network device, the terminal and the core network can perform steps 401 to 409.

[0095] Step 401, which can refer to steps 301 to 306 in FIG. 3, that is, the CU of the first network device has obtained the complete context information of the terminal.

[0096] Step 402, the CU creates an RRC connection setup request message sent to the terminal, and encapsulates the message into an RRC message container, and sends the RRC message container (encapsulating the RRC connection setup request message) to the DU connected to the terminal in the downlink RRC transmission message of the existing F1 interface. The CU decides whether to reset the MAC layer related to the terminal, and if the MAC layer related to the terminal needs to be reset, the downlink RRC transmission message contains at least one of the following: indication information of non-small data transmission data arrival, indication information of ending small data transmission, and indication information of media access control layer reset.

[0097] Step 403 (step 403 is an optional execution step), the DU receives the downlink RRC transmission message, and if the downlink RRC transmission message contains at least one of the following: indication information of non-small data transmission data arrival, indication information of ending small data transmission, and indication information of media access control layer reset, the DU of the first network device resets the MAC layer related to the terminal.

[0098] 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 setup request message to the terminal.

[0099] Step 405, the terminal receives the RRC connection setup request message, enables the configuration of the RRC connection state, and enters the RRC connection state, and sends first response information (also called RRC connection setup completion message) to the DU, the first response information is used to determine the RRC connection setup completion. The DU receives the first response information sent by the terminal, and does not parse the message, but encapsulates the message in an RRC message container and sends it to the CU.

[0100] Step 406, the CU receives the first response information sent by the DU, and triggers the terminal text update process, that is, the CU sends second request information to the DU according to the complete context information of the terminal received previously, the second request information is used to request the distributed unit to modify the current context information of the terminal. The second request information can contain the complete context information of the terminal, for example, the configuration information of the other DRB of the terminal which needs to be configured for SDT.

[0101] Step 407, the DU receives the second request information 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. The modification of the current context information of the terminal at least includes adding the configuration information of the non-small data transmission data radio bearer of the terminal in the current context information of the terminal.

[0102] Step 408, the DU sends feedback information to the CU, the feedback information is used to feed back the modification result.

[0103] Step 409, the first network device performs data transmission with the terminal entering the RRC connected state according to the modified context information, and the data transmission contains non-SDT data transmission.

[0104] In addition, the detailed description of steps 401 to 409 in the present example can also refer to the related description of the above embodiments or examples, which will not be repeated here.

[0105] As a further example, in the case where the first network device includes a CU and a DU, the CU and the DU are connected through an F1 interface. At this time, the F1 interface between the CU / DU also needs to be considered. If during the SDT transmission, 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, as shown in FIG. 5, the CU of the first network device (denoted as CU in FIG. 5), the DU of the first network device (denoted as DU in FIG. 5), the second network device, the terminal and the core network can further perform steps 501 to 508 (the difference between the present example and the previous example is that the time point and the manner in which the CU instructs the DU to perform MAC layer reset related to the terminal are different):

[0106] Step 501, (preparation step), which can refer to steps 301 to 306 in FIG. 3, that is, the CU of the first network device obtains the complete context information of the terminal.

[0107] Step 502, the CU creates an RRC connection establishment request message 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 in the downlink RRC transmission message of the existing F1 interface.

[0108] 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.

[0109] Step 504, the terminal receives the RRC connection establishment request message, enables the configuration of the RRC connected state, enters the RRC connected state, and sends first response information (which can also be referred to as an RRC connection establishment completion message) to the DU, the first response information is used to determine the completion of the RRC connection establishment. The DU receives the first response information sent by the terminal, and does not parse the message, but encapsulates the message in an RRC message container and sends it to the CU.

[0110] Step 505, the CU receives the first response information sent by the DU, and triggers a terminal context update process, that is, the CU sends second request information to the DU according to the complete context information of the terminal received previously, and the second request information is used to request the distributed unit to modify the current context information of the terminal. The CU decides whether to reset the MAC layer related to the terminal, and if the MAC layer related to the terminal needs to be reset, the second request information contains at least one of the following: indication information of non-small data transmission data arrival, indication information of small data transmission end, and indication information of media access control layer reset.

[0111] Step 506, the DU receives the second request information sent by the CU, and modifies the current context information of the terminal. The modification of 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 in the current context information of the terminal.

[0112] If the second request message contains at least one of the following: indication information of non-small data transmission data arrival, indication information of small data transmission end, and indication information of media access control layer reset, the DU resets the MAC layer related to the terminal.

[0113] Step 507, the DU sends feedback information to the CU, and the feedback information is used to feed back the modification result.

[0114] Step 508, the first network device transmits data based on the modified context information and the terminal in the RRC connected state, and the data transmission contains non-SDT data transmission.

[0115] In addition, the detailed description of steps 501 to 508 in the present example can also refer to the related description of the above embodiments or examples, which will not be repeated here.

[0116] Based on this, when performing small data transmission, if the network device receives non-small data transmission data of the terminal, the non-small data transmission data of the terminal can be directly transmitted based on the modified context information, avoiding the network device to release the terminal to the RRC INACTIVE state or the RRC IDLE state, and then to transmit the non-small data transmission data of the terminal after paging the terminal, solving the problem of time delay and increasing the signaling load of the air interface, and improving the data transmission efficiency.

[0117] It can be understood that in the above embodiments or examples, before the SDT data transmission, the first network device obtains the part of the context information of the UE related to the SDT from the second network device, such as the bearer configuration supporting the SDT. After obtaining the part of the context information of the UE, the first network device can perform the SDT data transmission according to the bearer configuration supporting the SDT and the UE. If there is non-SDT data to be transmitted to the UE, the first network device re-requests the complete context information of the UE from the second network device.

[0118] However, if the UE is configured with the MBS service, the UE may, at the same time, receive the broadcast MBS data from the first network device during the SDT data transmission stage (assuming that the current cell of the UE connected to the first network device supports the broadcast MBS data). However, according to the related procedures, at this time, the first network device only has the part of the context information of the UE, and the first network device does not know that the UE is receiving the broadcast data or the multicast data of the MBS. This may cause the first network device to use the hybrid automatic repeat request (HARQ) process of the UE for receiving the MBS data when scheduling the SDT data transmitted to the UE, resulting in packet loss of the UE receiving the MBS data or packet loss of the UE receiving the SDT data.

[0119] Based on this, the following is a method provided by the present disclosure for solving the problem that when the UE in the inactive state is configured with the MBS service, the first network device may cause the loss of data transmission with the UE after triggering the SDT data transmission in the related procedures. Referring to FIG. 6, the method comprises steps 601 to 604.

[0120] The preparatory step is that the UE is in the RRC inactive state, and the complete context information of the UE (including the context information related to the SDT and the context information related to the MBS) is saved in the second network device. During the movement, when the SDT data transmission with the UE is needed, according to the related procedures, the first network device currently connected to the UE needs to obtain the part of the context information related to the SDT from the second network device for the SDT data transmission.

[0121] Step 601, the first network device sends a UE context acquisition request message to the second network device, which contains the SDT indication information defined in the related protocol procedures, and the SDT indication information is used to indicate the acquisition of the context information related to the SDT. The UE context acquisition request message can also contain MBS support indication information, which is used to indicate that the cell currently connected to the UE supports the MBS service.

[0122] Step 602, the second network device checks the stored complete context information of the UE, and judges whether the UE is configured with the MBS service according to whether the MBS session configuration information is contained in the complete context information of the UE.

[0123] Step 603, if the MBS support indication information is contained in the UE context acquisition request message received by the second network device, and the second network device judges that the UE is currently configured with the MBS service, the second network device sends feedback information to the first network device, and the feedback information contains the complete context information of the UE, or the context information related to the SDT and the context information related to the MBS. (Different from the related process, in the related process, if the second network device receives the message containing the SDT indication, the second network device will only feed back the context information related to the SDT to the first network device).

[0124] In some embodiments, in step 601, the UE context acquisition request message sent by the first network device only contains the SDT indication. In step 603, after receiving the UE context acquisition request message, if the second network device judges that the UE is currently configured with the MBS service, the second network device sends the feedback information to the first network device according to the related process, and the feedback information only contains the context information related to the SDT, and the feedback information can also contain the MBS session ID or the MBS service indication, which is used to indicate that the UE is configured with the MBS service. Or the first network device sends the UE context acquisition failure response message to the second network device, and the UE context acquisition failure response message contains the MBS session ID or the MBS service indication, which is used to indicate that the UE is configured with the MBS service. The first network device receives the feedback information of the second network device, and if the feedback information contains the MBS session ID or the MBS service indication, the first network device re-sends the UE context acquisition request message to the second network device, and the UE context acquisition request message does not contain the SDT indication. The second network device returns the complete context information of the UE to the first network device in the subsequent feedback information.

[0125] Step 604, after receiving the feedback information, the first network device saves the complete context information of the UE contained in the feedback information, or the context information related to the SDT and the context information related to the MBS. The first network device configures and / or establishes the 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 according to the context information related to the MBS.

[0126] The following also shows a data transmission apparatus for performing the data transmission method in any of the above embodiments and possible implementation manners thereof. It can be understood that the data transmission apparatus comprises a hardware structure and / or software module corresponding to the execution of each function in order to implement the data transmission method; a person 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 certain function is implemented in hardware or computer software driven hardware depends on the specific application of the technical solution and the design constraints. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present disclosure.

[0127] The embodiments of the present disclosure can divide the function modules of the data transmission apparatus according to the above-mentioned method embodiments, for example, each function module can be divided according to each function, or two or more functions can be integrated in one function module. The above-mentioned integrated module can be realized in the form of hardware or in the form of software. It should be noted that the division of the modules in the embodiments of the present disclosure is illustrative, and is only a logical function division. When actually implemented, there can be another division manner. The following will be described taking the example of dividing each function module according to each function.

[0128] FIG. 7 is a structural schematic diagram of a data transmission apparatus according to some embodiments, applied to a network device. The data transmission apparatus 700 comprises a communication module 701, an acquisition module 702 and a processing module 703;

[0129] The communication module 701 is configured to receive first indication information, the first indication information being used to indicate that non-small data transmission data of a terminal arrives or ends small data transmission of the terminal.

[0130] The acquisition module 702 is configured to acquire complete context information of the terminal in response to the first indication information.

[0131] The processing module 703 is configured to modify current context information of the terminal according to the complete context information of the terminal, to obtain modified context information.

[0132] The communication module 701 is further configured to transmit data of the terminal according to the modified context information, the data of the terminal at least comprising the non-small data transmission data of the terminal.

[0133] In some embodiments, the communication module 701 is configured to:

[0134] According to the modified context information, transmit the data of the terminal through a radio resource control connection between the terminal and the network device.

[0135] In some embodiments, the radio resource control connection establishment is before or after the network device modifies the current context information of the terminal according to the complete context information of the terminal.

[0136] In some embodiments, the radio resource control connection establishment comprises:

[0137] sending a first request message to the terminal, the first request message being used to request to establish a radio resource control connection between the terminal and the network device, the first request message containing second indication information, the second indication information being used to instruct the terminal to restore the complete context information of the terminal.

[0138] In some embodiments, the second indication information comprises at least one of the following: indication information of resuming to a connected state, indication information of arrival of non-small data transmission data, and indication information of ending small data transmission.

[0139] In some embodiments, the modification of the current context information of the terminal comprises at least one of the following:

[0140] adding configuration information of a data radio bearer of non-small data transmission of the terminal in the current context information of the terminal;

[0141] resetting a medium access control layer related to the terminal in the network device.

[0142] In some embodiments, the processing module 703 is located in a distributed unit in the network device, and the processing module 703 is configured to modify the current context information of the terminal according to the complete context information of the terminal to obtain modified context information.

[0143] In some embodiments, the processing module 703 is located in a distributed unit in the network device, and the processing module 703 is configured to modify the current context information of the terminal at least by adding configuration information of a data radio bearer of non-small data transmission of the terminal in the current context information of the terminal.

[0144] In some embodiments, the processing module 703 is located in a distributed unit in the network device, and the network device further comprises a centralized unit, and the processing module 703 is further configured to receive a second request message sent by the centralized unit, the second request message being used to request the distributed unit to modify the current context information of the terminal.

[0145] In some embodiments, the processing module 703 is located in a distributed unit in the network device, and the network device comprises a centralized unit, and the processing module 703 is configured to:

[0146] receive a third request message sent by the centralized unit, the third request containing 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 resetting a medium access control layer;

[0147] reset the medium access control layer related to the terminal in the network device.

[0148] 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 setup request message that needs to be sent to the terminal.

[0149] In some embodiments, the second request message contains 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 resetting a medium access control layer.

[0150] In some embodiments, the processing module 703 is located in a distributed unit in the network device, and the processing module 703 is further configured to reset the medium access control layer related to the terminal in the network device.

[0151] For more detailed descriptions of the communication module 701, the obtaining module 702, and the processing module 703, and more detailed descriptions of the technical features and beneficial effects, refer to the corresponding method embodiment part described above, which will not be repeated here.

[0152] It should be noted that the modules in FIG. 7 can also be referred to as units, for example, the communication module can be referred to as a communication unit. In addition, in the embodiment shown in FIG. 7, the names of the various modules can not be the names shown in the figure, for example, the communication module can also be referred to as a sending module or a receiving module.

[0153] If each unit or module in FIG. 7 is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the disclosure or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the various embodiments of the disclosure. The storage medium storing the computer software product includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0154] In the case of implementing the functions of the above-mentioned integrated modules in the form of hardware, the embodiments of the present disclosure further provide a structure of a communication device for performing the data transmission method provided by the embodiments of the present disclosure. As shown in FIG. 8, the communication device 800 includes a communication interface 803, a processor 802 and a bus 804. In some embodiments, the communication device can further include a memory 801.

[0155] The processor 802 can be various exemplary logical blocks, modules and circuits described in combination with the embodiments of the present disclosure. The processor 802 can 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 device, a transistor logic device, a hardware component or any combination thereof. The processor 802 can implement or execute various exemplary logical blocks, modules and circuits described in combination with the embodiments of the present disclosure. The processor 802 can also be a combination of implementing computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessor, etc.

[0156] The communication interface 803 is used to connect with other devices through a communication network. The communication network can be an Ethernet, a wireless access network, a wireless local area network (WLAN) and the like.

[0157] The memory 801 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a magnetic 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.

[0158] As an implementation manner, the memory 801 can exist independently of the processor 802, and the memory 801 can be connected with the processor 802 through the bus 804, for storing instructions or program codes. When the processor 802 invokes and executes the instructions or program codes stored in the memory 801, the data transmission method provided by the embodiments of the present disclosure can be implemented.

[0159] In another implementation manner, the memory 801 can also be integrated with the processor 802.

[0160] Bus 804, which can be an extended industry standard architecture (EISA) bus, a peripheral component interconnect (PCI) bus, or another type of bus, connects the various components of the computing device 800. The bus 804 can be split into buses, for example, an address bus and a data bus, each of which can be of various types. For the sake of simplicity, only one bus is shown in FIG. 8, but it should be understood that the bus 804 can include multiple buses.

[0161] Some embodiments of the present disclosure provide a computer readable storage medium (for example, a non-transitory computer readable storage medium) having stored computer program instructions, which, when executed on a computer, cause the computer to perform the data transmission method according to any one of the above embodiments.

[0162] In an embodiment, the computer can be the data transmission apparatus described above, and the present disclosure does not limit the form of the computer.

[0163] In some examples, the computer readable storage medium described above can include, but is not limited to, a magnetic storage device (for example, a hard disk, a floppy disk, or a tape), an optical disk (for example, a compact disk (CD), a digital versatile disk (DVD), and the like), a smart card, and a flash memory device (for example, an erasable programmable read-only memory (EPROM), a card, a stick, or a key drive, and the like). The various computer readable storage media described in the present disclosure can represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" can include, but is not limited to, a wireless channel and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0164] The embodiments of the present disclosure provide a computer program product containing instructions, which, when executed on a computer, cause the computer to perform the data transmission method according to any one of the above embodiments.

[0165] The above description is merely a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or replacements within the technical scope disclosed by the present disclosure should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

A data transmission method, wherein, The method is performed by a network device, and the method comprises: receiving first indication information, the first indication information being used for indicating that non-small data transmission data of a terminal arrives or ends small data transmission of the terminal; obtaining complete context information of the terminal in response to the first indication information; modifying current context information of the terminal according to the complete context information of the terminal to obtain modified context information; transmitting data of the terminal according to the modified context information, the data of the terminal at least comprising non-small data transmission data of the terminal. The method of claim 1, wherein, The transmitting the data of the terminal according to the modified context information comprises: transmitting the data of the terminal through a radio resource control connection between the terminal and the network device according to the modified context information. The method of claim 2, wherein, 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. The method of claim 3, wherein, The establishing the radio resource control connection comprises: sending a first request message to the terminal, the first request message being used for requesting to establish the radio resource control connection between the terminal and the network device, and the first request message comprising second indication information, the second indication information being used for instructing the terminal to restore the complete context information of the terminal. The method of claim 4, wherein, The second indication information comprises at least one of the following: indication information of radio resource control resuming to a connected state, indication information of non-small data transmission data arriving, and indication information of ending small data transmission. The method of any one of claims 1 to 5, wherein, The modifying the current context information of the terminal comprises at least one of the following: adding configuration information of a data radio bearer of non-small data transmission of the terminal in the current context information of the terminal; resetting a medium access control layer related to the terminal in the network device. The method of any one of claims 1 to 6, wherein, The network device comprises 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 comprises: the distributed unit modifying the current context information of the terminal according to the complete context information of the terminal to obtain the modified context information. The method of claim 7, wherein, The modifying the current context information of the terminal at least comprises adding configuration information of a data radio bearer of non-small data transmission of the terminal in the current context information of the terminal. The method of claim 8, wherein, The network device further comprises 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, the method further comprises: the distributed unit receiving a second request message sent by the centralized unit, the second request message being used for requesting the distributed unit to modify the current context information of the terminal. The method of claim 9, wherein, Before the distributed unit receives the second request message sent by the centralized unit, the method further comprises: the distributed unit receiving a third request message sent by the centralized unit, the third request comprising at least one of the following: indication information of non-small data transmission data arriving, indication information of ending small data transmission, and indication information of medium access control layer resetting. The distributed unit resets a medium access control layer related to the terminal in the network device. The method of claim 10, wherein, 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. The method of claim 9, wherein, 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 resetting a medium access control layer. The method of claim 12, wherein, The modification of the current context information of the terminal further includes: resetting a medium access control layer related to the terminal in the network device. A communication device comprising: a memory and a processor; the memory and the processor are coupled; the memory is configured to store instructions executable by the processor; the processor executes the instructions to perform the method according to any one of claims 1 to 13. A computer-readable storage medium, wherein, The computer readable storage medium stores computer instructions, and when the computer instructions run on the communication device, the communication device executes the method according to any one of claims 1 to 13. A computer program product, wherein, When the computer program product is executed, the method according to any one of claims 1 to 13 is implemented.

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