Data wireless bearer release method, communication device, communication system and storage medium

Abstract

The present application provides a data radio bearer release method, a communication device, a communication system and a storage medium, the purpose of which is to improve the utilization rate of transmission resources. The present application provides a data radio bearer release method, comprising: if the communication mode of the terminal device is a store-and-forward mode, and there is a first data radio bearer, sending a first indication message to the NTN network device, the first indication message is used to request the NTN network device to release the first data radio bearer, and the first data radio bearer is used to carry the transmission control protocol service; receiving a second indication message from the NTN network device, the second indication message is used to instruct the terminal device to delete the first data radio bearer; deleting the first data radio bearer, and sending a first feedback message to the NTN network device. The terminal device can actively request the NTN network device to release the first data radio bearer, and can release the first data radio bearer based on the reconfiguration message from the NTN network device, thereby improving the utilization rate of transmission resources.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a data wireless bearer release method, a communication device, a communication system and a storage medium. Background Art

[0002] Due to the advantages of global coverage and flexible deployment, non-terrestrial networks (NTN) have been widely used in various communication scenarios. When satellite communication networks in non-terrestrial networks are used for communication in communication scenarios, the feeder link between the satellite and the ground station will be forced to be interrupted as the satellite moves due to the limited coverage of the ground station. When the feeder link between the satellite and the ground station is about to be disconnected or has been disconnected, the NTN network equipment will usually directly switch the communication mode with the terminal device from normal mode to store-and-forward mode.

[0003] However, if the terminal device is transmitting data of the Transmission Control Protocol (TCP) service before the NTN network device switches the communication mode between the terminal device and the normal mode to the store-and-forward mode, the terminal device will continuously retransmit data because it cannot receive the TCP acknowledgment character (ACK), resulting in a waste of transmission resources. Summary of the invention

[0004] The present application provides a data wireless bearer release method, a communication device, a communication system and a storage medium, the purpose of which is to improve the utilization rate of transmission resources.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of the present application provides a data radio bearer release method, which is applied to a terminal device, and the method includes:

[0007] If the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, send first indication information to the NTN network device, where the first indication information is used to request the NTN network device to release the first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service;

[0008] receiving second indication information from the NTN network device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer;

[0009] The first data radio bearer is deleted, and a feedback message is sent to the NTN network device.

[0010] In the above implementation scheme, in order to improve the utilization rate of transmission resources, when the communication mode between the terminal device and the NTN network device is the store-and-forward mode, and there is a first data radio bearer for carrying the transmission control protocol service, the terminal device can actively request the NTN network device to release the first data radio bearer through the first indication information, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0011] In a possible implementation of the first aspect of the present application, if the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, sending the first indication information to the non-terrestrial network NTN network device includes: if the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, and the service quality delay of the first data radio bearer is lower than a threshold, sending the first indication information to the NTN network device. In the above implementation scheme, if the service quality delay of the first data radio bearer used for the transmission control protocol service is lower than the threshold, it is more likely to cause the terminal device to retransmit data without receiving a TCP confirmation character in a short time, so the terminal device can actively request the NTN network device to release the first data radio bearer with a service quality delay lower than the threshold, and can release the first data radio bearer with a service quality delay lower than the threshold based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive a TCP confirmation character, thereby improving the utilization rate of transmission resources.

[0012] In a possible implementation of the first aspect of the present application, the sending of the first indication information to the NTN network device includes: sending a terminal assistance information message UE Assistance InformationMessage to the NTN network device, wherein the terminal assistance information message includes the first indication information. In the above implementation scheme, the terminal device can send the first indication information to the NTN network device based on the terminal assistance information message to actively request the NTN network device to release the first data radio bearer, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to failure to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0013] In a possible implementation of the first aspect of the present application, the method further includes: if the communication mode of the terminal device is the store-and-forward mode and there is a second data radio bearer, it is prohibited to establish a transmission control protocol connection, and the second data radio bearer is not used for the transmission control protocol service. In the above implementation scheme, when the communication mode between the terminal device and the NTN network device is the store-and-forward mode, since the second data radio bearer is not used to carry the transmission control protocol service, the terminal device will not continuously retransmit data due to the inability to receive TCP confirmation characters. Therefore, when there is a second data radio bearer that is not used to carry the transmission control protocol service between the terminal device and the NTN network device, the second data radio bearer can be prohibited from starting to carry the transmission of the transmission control protocol service data by prohibiting the establishment of a new transmission control protocol connection, thereby avoiding the situation where the terminal device continuously retransmits data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0014] In a possible implementation of the first aspect of the present application, the prohibition of establishing a transmission control protocol connection includes: setting a first flag bit, the first flag bit being used to indicate that the terminal device prohibits establishing a transmission control protocol connection. In the above implementation scheme, the terminal device can prohibit establishing a transmission control protocol connection by setting the first flag bit, thereby preventing the second data radio bearer from starting to carry the transmission of transmission control protocol service data, thereby preventing the terminal device from continuously retransmitting data due to failure to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0015] In a possible implementation of the first aspect of the present application, the method further includes: if there is no data radio bearer, prohibiting the initiation of a protocol data unit session. In the above implementation, if there is no data radio bearer between the terminal device and the NTN network device, the terminal device can prohibit itself from initiating a protocol data unit session to avoid the terminal device initiating a new transmission control protocol connection or establishing a new transmission control protocol service, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive a TCP confirmation character, thereby improving the utilization rate of transmission resources.

[0016] In a possible implementation of the first aspect of the present application, before sending the first indication information to the NTN network device, the method further includes: receiving a capability query request from the NTN network device; sending a capability query response message to the NTN network device, the capability query response message including third indication information, the third indication information being used to indicate whether the terminal device supports the release of the data radio bearer. In the above implementation scheme, before sending the first indication information to the NTN network device, the terminal device may receive a capability query request from the NTN network device; and may determine whether the terminal device itself supports the release of the data radio bearer, and finally may report the third indication information used to indicate whether the terminal device supports the release of the data radio bearer to the NTN network device through the capability query response message, so that the NTN network device determines whether the terminal device has the capability to support the release of the data radio bearer.

[0017] In a possible implementation of the first aspect of the present application, the sending of the first indication information to the NTN network device includes: if the terminal device is in a radio resource control connection state with the NTN network device, sending the first indication information to the NTN network device. In the above implementation scheme, before sending the first indication information to the NTN network device, the terminal device may first confirm whether it is in a radio resource control connection state with the NTN network device. If the terminal device is in a radio resource control connection state with the NTN network device, the first indication information may be sent to the NTN network device, so that when there is a first data radio bearer for carrying a transmission control protocol service between the terminal device and the NTN network device, the terminal device may actively request the NTN network device to release the first data radio bearer, and may release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to failure to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0018] In a possible implementation of the first aspect of the present application, if the communication mode of the terminal device is a store-and-forward mode and it is not in a radio resource control connection state with the NTN network device, it is prohibited to initiate a protocol data unit session. In the above implementation scheme, the terminal device can confirm whether it is in a radio resource control connection state with the NTN network device. If the terminal device is not in a radio resource control connection state with the NTN network device, the terminal device can prohibit itself from initiating a protocol data unit session to avoid the terminal device initiating a new transmission control protocol connection or establishing a new transmission control protocol service, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0019] In a possible implementation of the first aspect of the present application, the prohibition of initiating a protocol data unit session includes: setting a second flag bit, wherein the second flag bit is used to indicate that the terminal device prohibits initiating a protocol data unit session. In the above implementation scheme, the terminal device can prohibit initiating a protocol data unit session by setting the second flag bit to avoid the terminal device initiating a new transmission control protocol connection or establishing a new transmission control protocol service, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive a TCP confirmation character, thereby improving the utilization rate of transmission resources.

[0020] In a possible implementation of the first aspect of the present application, the terminal device includes a new wireless NR device or an Internet of Things (IoT) terminal device; the NTN network device includes any one of an NTN base station, a satellite base station, a drone network device, a high-altitude platform network device, an aircraft network device, and a communication balloon network device.

[0021] In a possible implementation of the first aspect of the present application, the signaling carrying the first indication information includes at least one of the following: radio resource control RRC signaling, or a first media access control control element MAC CE, or an uplink control signaling, or a physical uplink control channel PUSCH. In the above implementation scheme, the first indication information can be transmitted by any one of radio resource control RRC signaling, or a first media access control control element MAC CE, or an uplink control signaling, or a physical uplink control channel PUSCH.

[0022] In a possible implementation of the first aspect of the present application, the signaling carrying the second indication information includes at least one of the following: radio resource control RRC reconfiguration signaling, or a second media access control control element MAC CE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH. In the above implementation scheme, the second indication information can be transmitted by any one of radio resource control RRC reconfiguration signaling, or a second media access control control element MAC CE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH.

[0023] A second aspect of the present application provides a data radio bearer release method, which is applied to a non-terrestrial network NTN network device, and the method includes:

[0024] receiving first indication information from a terminal device, where the first indication information is used to request the NTN network device to release a first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service;

[0025] Sending second indication information to the terminal device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer;

[0026] receiving a feedback message from the terminal device;

[0027] The first data radio bearer is deleted.

[0028] In the above implementation, in order to improve the utilization rate of transmission resources, after the NTN network device receives the first indication information from the terminal device for requesting the NTN network device to release the first data radio bearer, the second indication information can be sent to the terminal device, so that the terminal device can release the first data radio bearer based on the second indication information from the NTN network device. In addition, the NTN network device can also delete the first data radio bearer after receiving the feedback message from the terminal device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0029] In a possible implementation manner of the second aspect of the present application, the receiving the first indication information from the terminal device includes: receiving a terminal assistance information message UE Assistance Information Message from the terminal device, the terminal assistance information message including the first indication information.

[0030] In a possible implementation of the second aspect of the present application, the method also includes: sending a capability query request to a terminal device; receiving a capability query response message from the terminal device, the capability query response message including third indication information, and the third indication information is used to indicate whether the terminal device supports the release of the data wireless bearer.

[0031] In a possible implementation of the second aspect of the present application, the terminal device includes a new wireless NR device or an Internet of Things (IoT) terminal device; the NTN network device includes any one of an NTN base station, a satellite base station, a drone network device, a high-altitude platform network device, an aircraft network device, and a communication balloon network device.

[0032] In a possible implementation manner of the second aspect of the present application, the signaling carrying the first indication information includes at least one of the following: radio resource control RRC signaling, or a first media access control element MAC CE, or uplink control signaling, or a physical uplink control channel PUSCH.

[0033] In a possible implementation manner of the second aspect of the present application, the signaling carrying the second indication information includes at least one of the following: radio resource control RRC reconfiguration signaling, or a second media access control control element MAC CE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH.

[0034] A third aspect of the present application provides a data radio bearer release method, which is applied to a terminal device and an NTN network device, wherein the terminal device executes the following method:

[0035] If the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, send first indication information to a non-terrestrial network NTN network device, where the first indication information is used to request the NTN network device to release the first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service;

[0036] receiving second indication information from the NTN network device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer;

[0037] Deleting the first data radio bearer, and sending a first feedback message to the NTN network device;

[0038] The NTN network device performs the following method:

[0039] receiving first indication information from a terminal device, where the first indication information is used to request the NTN network device to release a first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service;

[0040] Sending second indication information to the terminal device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer;

[0041] Receiving a first feedback message from the terminal device;

[0042] The first data radio bearer is deleted.

[0043] A fourth aspect of the present application provides a communication device, wherein the communication device is specifically a terminal device, and the communication device includes:

[0044] A sending module, configured to send first indication information to a non-terrestrial network NTN network device if the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, wherein the first indication information is used to request the NTN network device to release the first data radio bearer, and the first data radio bearer is used to carry a transmission control protocol service;

[0045] A receiving module, used for receiving second indication information from the NTN network device, where the second indication information is used for instructing the terminal device to delete the first data radio bearer;

[0046] a deleting module, configured to delete the first data radio bearer,

[0047] The sending module is further used to send a first feedback message to the NTN network device.

[0048] A fifth aspect of the present application provides a communication device, wherein the communication device is specifically a non-terrestrial network NTN network device, and the communication device includes:

[0049] A receiving module, configured to receive first indication information from a terminal device, wherein the first indication information is used to request the NTN network device to release a first data radio bearer, wherein the first data radio bearer is used to carry a transmission control protocol service;

[0050] A sending module, used to send second indication information to the terminal device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer;

[0051] A receiving module, configured to receive a first feedback message from the terminal device;

[0052] A deleting module is used to delete the first data radio bearer.

[0053] The sixth aspect of the present application provides a communication device, comprising: a memory and at least one processor. The memory is used to store a program, and the at least one processor is used to execute a computer program or a computer instruction stored in the memory, so that the communication device implements any one of the data radio bearer release methods provided in the first aspect of the present application.

[0054] The seventh aspect of the present application provides a communication device, comprising: a memory and at least one processor. The memory is used to store a program, and the at least one processor is used to execute a computer program or a computer instruction stored in the memory, so that the communication device implements any one of the data radio bearer release methods provided in the second aspect of the present application.

[0055] The eighth aspect of the present application is a computer storage medium used to store a computer program. When the computer program is executed, it is used to implement any one of the data wireless bearer release methods provided in the first aspect or the second aspect of the present application.

[0056] A ninth aspect of the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute any one of the data radio bearer release methods described in the first aspect or the second aspect.

[0057] The tenth aspect of the present application provides a chip system, which includes a processor for supporting a terminal device or an NTN network device to implement the functions involved in the above aspects, for example, sending or processing the data and / or information involved in the above methods. In a possible design, the chip system also includes a memory, which is used to store necessary program instructions and data for the terminal device or the NTN network device. The chip system can be composed of a chip, or it can include a chip and other discrete devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 A schematic diagram of the system architecture of a communication system provided in an embodiment of the present application;

[0059] Figure 2 A schematic diagram of the structure of a satellite communication network provided in an embodiment of the present application;

[0060] Figure 3 A schematic diagram of the structure of another satellite communication network provided in an embodiment of the present application;

[0061] Figure 4a A flow chart of a TCP service before an NTN network device switches the communication mode between the NTN network device and the terminal device from a normal mode to a store-and-forward mode provided in an embodiment of the present application;

[0062] Figure 4b A flow chart of a TCP service after an NTN network device switches the communication mode between the NTN network device and the terminal device from a normal mode to a store-and-forward mode provided in an embodiment of the present application;

[0063] Figure 5 A schematic diagram of an interaction process between an NTN network device and a terminal device provided in an embodiment of the present application;

[0064] Figure 6 A schematic diagram of another interaction process between an NTN network device and a terminal device provided in an embodiment of the present application;

[0065] Figure 7 A schematic diagram of a flow chart of a data radio bearer release method provided in an embodiment of the present application;

[0066] Figure 8 A schematic diagram of a flow chart of another data radio bearer release method provided in an embodiment of the present application;

[0067] Fig. 9 A schematic diagram of a flow chart of a communication method on the terminal side provided in an embodiment of the present application;

[0068] Fig.10 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0069] Fig.11 A schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0070] Fig.12 This is a structural example diagram of an electronic device disclosed in an embodiment of the present application;

[0071] Fig.13 This is a structural example diagram of another electronic device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0073] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0074] The multiple involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0075] The embodiments of the present application are applied to a communication system, which may be a second generation (2G) communication system, a third generation (3G) communication system, an LTE system, a fifth generation (5G) communication system, an LTE and 5G hybrid architecture, a 5G new wireless (5G New Radio, 5G NR) system, and new communication systems that will emerge in future communication developments.

[0076] The communication system includes a first device and a second device. The first device may be a device on the network side for providing network communication functions, which is also referred to as a network device or a network element in some cases. In the embodiment of the present application, the network device may specifically be an NTN network device. The NTN network device may generally be a base station (including functional units of a base station, or a combination of functional units of a base station) or a core network unit, wherein the core network unit may be a functional unit in the core network, including but not limited to an access and mobility management function (AMF) unit or a session management function (SMF) unit. The second device may be a device for accessing the network, which may generally be a terminal device. An example of a communication system is as follows: Figure 1 As shown, Figure 1 The system includes a base station 1 and a terminal 2. For example, the first device may be a terminal device in an NTN communication system, and the second device may be an NTN network device in the NTN communication system.

[0077] In the embodiments provided in the present application, the base station may be any device having a wireless transceiver function, including but not limited to: an evolved base station (NodeB or eNB or e-NodeB, evolutionary Node B) in long term evolution (LTE), a base station (gNodeB or gNB) or a transmission receiving point (transmission receiving point / transmission reception point, TRP) in new radio (NR), a base station of subsequent evolution of 3GPP, an access node in a Wi-Fi system, a wireless relay node, a wireless backhaul node, etc. The base station may be: a macro base station, a micro base station, a micro-micro base station, a small station, a relay station, or a balloon station, etc. The base station may include one or more co-site or non-co-site transmission points (Transmission Reception Point, TRP). The base station may also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The base station may communicate with a terminal device, or communicate with the terminal device through a relay station. The terminal device can communicate with multiple base stations of different technologies. For example, the terminal device can communicate with a base station supporting an LTE network, or a base station supporting a 5G network, or a base station supporting an LTE network and a base station supporting a 5G network. For another example, the network device is specifically a network device in an NTN communication system, that is, an NTN network device. For example, the NTN network device includes any one of an NTN base station (gNB), a drone network device, a high-altitude platform network device, an aircraft network device, and a communication balloon network device. The specific implementation method of the NTN network device is not limited in the embodiments of the present application. This is just an example of a possible scenario.

[0078] In the embodiments provided in the present application, the terminal device can be in various forms, for example, a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a vehicle-mounted terminal device, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, a wireless terminal device in smart home, a wearable terminal device, etc. The terminal device can also be sometimes referred to as a terminal device, a user equipment (UE), an access terminal device, a vehicle-mounted terminal device, an industrial control terminal device, a UE unit, a UE station, a mobile station, a mobile station, a remote station, a remote terminal device, a mobile device, a UE terminal device, a terminal device, a wireless communication device, a UE agent or a UE device, etc. The terminal device can also be a fixed terminal device or a mobile terminal device. The terminal device may also be a new wireless NR device or an Internet of Things (IOT) terminal device.

[0079] In the communication system, Data Radio Bearer (DRB) is a bearer used to transmit user data in the wireless interface. These bearers are usually established and maintained during a user session to support data transmission between the terminal device and the NTN network equipment. DRB is a channel for transmitting user data between the user equipment and the base station, supporting various types of data applications. DRB is dynamically established based on the user's communication needs to meet the data transmission requirements in different application scenarios. In the 5G network, DRB is mapped with Quality of Service (QoS) to ensure that different services can obtain appropriate service quality guarantees. When the communication session is completed or no longer needed, the DRB can be released to optimize the use of network resources and ensure that resources can be effectively used by other users or services.

[0080] The Transmission Control Protocol (TCP) service is a transport layer-based communication service that provides connection-oriented, reliable, byte-stream-based data transmission. TCP uses confirmation and retransmission mechanisms to ensure reliable data transmission, that is, if the sender does not receive a confirmation signal from the receiver within a certain period of time, it will retransmit the data packet.

[0081] Non-Terrestrial Network (NTN) technology is one of the technical directions for direct mobile phone connection to satellites and is an important supplement to ground cellular communication technology. By integrating satellite communication networks with ground 5G networks, NTN technology can provide ubiquitous coverage without being restricted by topography, connecting the multi-dimensional space of air, space, land, and sea to form an integrated ubiquitous access network that can be accessed on demand in all scenarios. Non-terrestrial networks can achieve seamless communication on a global scale without being restricted by geographical location; and satellite communication networks can be flexibly deployed to quickly respond to various communication needs. Due to the advantages of global coverage and flexible deployment of non-terrestrial networks, they have been widely used in a variety of communication scenarios.

[0082] In addition, Internet of Things - Non-Terrestrial Network (IoT-NTN) is an important branch of non-terrestrial network technology, which aims to provide connection services for IoT devices through non-terrestrial network means such as satellite communications. With the rapid development of IoT technology, more and more devices need to access the network to achieve interconnection. However, in some remote areas or areas such as oceans and airspace that are difficult to cover with traditional terrestrial networks, the connection of IoT devices has become a problem. The emergence of IoT-NTN technology is precisely to solve this problem, and to achieve wide-area coverage and remote connection of IoT devices through non-terrestrial network means such as satellites.

[0083] See also Figure 2, when a satellite communication network in a non-terrestrial network is used for communication in a communication scenario, due to the limited coverage of the ground station, as the satellite moves, the same satellite often fails to provide a service link to the terminal device while providing a feeder link to the ground station. The feeder link refers to a radio link from an earth station located at a designated fixed point to a space station (such as a satellite), or from a space station to an earth station located at a fixed point. This link is mainly used for space radio communication services other than satellite fixed services. Specifically, the feeder link plays an important role in the satellite communication system. It is a communication link connecting the ground station (or gateway, gateway station) and the satellite. The service link is used to connect the terminal device and the NTN network device in the satellite communication network to realize data transmission and service interaction. The NTN network device can specifically be an IOT-NTN network device.

[0084] See also Figure 3 When the satellite is in state A, there is a feeder link between the NTN network equipment on the satellite and the ground station, and there is a service link between the NTN network equipment and the terminal equipment. At this time, the communication mode of the NTN network equipment on the satellite is normal mode. While maintaining the connection state, as the satellite moves from state A to state B, there is still a service link between the NTN network equipment on the satellite and the terminal equipment, and the feeder link between the NTN network equipment and the ground station is disconnected. At this time, the NTN network equipment needs to switch the communication mode from normal mode to store and forward (S&F) mode to continue data transmission.

[0085] Store and Forward (S&F) technology is a data transmission method in which data is first completely stored in the buffer of an intermediate node (such as a router, switch, etc.) during transmission, and is not forwarded to the next node until the entire data packet is completely received and verified to be correct. This method ensures the integrity and reliability of the data, but may introduce certain transmission delays. Store and forward technology is widely used in various communication networks, including local area networks (LANs), wide area networks (WANs), the Internet, and satellite communications. Especially in satellite communications, since the communication link between the satellite and the ground station has a long propagation delay and a high bit error rate, store and forward technology is usually used to improve the reliability and integrity of data transmission.

[0086] The communication mode between NTN network equipment and terminal equipment can be divided into normal mode and store-and-forward mode according to whether the store-and-forward technology is adopted. When the communication mode between NTN network equipment and terminal equipment is normal mode, NTN network equipment and terminal equipment are in normal working or activation state, which means that the hardware and software systems of NTN network equipment and terminal equipment are operating normally and are ready to respond to communication requests at any time; and NTN network equipment and terminal equipment can send and receive data normally, and the real-time performance of communication is usually high, which means that NTN network equipment and terminal equipment can respond to communication requests faster and complete data transmission faster.

[0087] When the communication mode between the NTN network device and the terminal device is the store-and-forward mode, the NTN network device and the terminal device will first store the received data locally, and then forward the data to the target device according to the network conditions or other factors. That is, once conditions permit, the NTN network device and the terminal device will forward the locally stored data to the target device. The store-and-forward mode usually has high reliability because it allows the terminal device and the NTN network device to temporarily store data when the network conditions are poor and continue to transmit after the conditions improve, which helps reduce the risk of data loss and transmission failure.

[0088] However, if the terminal device is transmitting data of the Transmission Control Protocol (TCP) service before the NTN network device switches the communication mode between the terminal device and the normal mode to the store-and-forward mode, the terminal device will continuously retransmit data because it cannot receive the TCP acknowledgment character (ACK), resulting in a waste of transmission resources.

[0089] Specifically, see Figure 4a , before the NTN network device switches the communication mode with the terminal device from the normal mode to the store-and-forward mode, and the terminal device is transmitting data of the TCP service, the terminal device will first send the TCP service data to the NTN network device, and then the NTN network device will forward the TCP service data to the Mobility Management Entity (MME); after successfully receiving the TCP service data, the MME will return a TCP confirmation character to the NTN network device, and then the NTN network device will forward the TCP confirmation character to the terminal device. After receiving the TCP confirmation character, the terminal device completes the data transmission of the TCP service. Please refer to Figure 4b, when the NTN network device switches the communication mode between the terminal device and the normal mode to the store-and-forward mode, the MME cannot forward the TCP confirmation character to the terminal device through the NTN network device because the feeder link between the NTN network device and the MME is disconnected, resulting in the terminal device being unable to receive the TCP confirmation character and starting to retransmit the TCP service data to the NTN network device. And because the feeder link between the NTN network device and the MME is disconnected at this time, the terminal device cannot release the DRB by releasing the Protocol Data Unit (PDU), and the NTN network device cannot know whether the DRB carries TCP or UDP services.

[0090] In order to make the technical solution of the present application clearer and easier to understand, the data wireless bearer release method of the embodiment of the present application is introduced below in conjunction with the accompanying drawings. The embodiment of the present application is applicable to the data transmission process in the wireless communication scenario. In the embodiment of the present application, the data transmission between the terminal device and the NTN network device is taken as an example, such as the data transmission between a single terminal device and the NTN network device. The above-mentioned data transmission between the terminal device and the NTN network device is only a feasible example. The embodiment of the present application can be applied to the data transmission between the terminal device and the terminal device, or the data transmission between the NTN network device and the NTN network device, or the data transmission between two network elements in the wireless communication network.

[0091] See also Figure 5 , Figure 5 The figure is a schematic diagram of an interaction process between an NTN network device and a terminal device provided in an embodiment of the present application. A data radio bearer release method provided in an embodiment of the present application mainly includes the following steps:

[0092] 501. If the communication mode of the terminal device is the store-and-forward mode and there is a first data radio bearer, the terminal device sends first indication information to the non-terrestrial network NTN network device.

[0093] The first indication information is used to request the NTN network device to release the first data radio bearer, and the first data radio bearer is used to carry the transmission control protocol service.

[0094] In the embodiment of the present application, the terminal device may first determine whether the communication mode at this time is the store-and-forward mode, and whether there is a first data radio bearer for carrying the transmission control protocol service between the terminal device and the NTN network device. If it is determined that the communication mode of the terminal device at this time is the store-and-forward mode, and there is a first data radio bearer for carrying the transmission control protocol service between the terminal device and the NTN network device, it means that the terminal device is transmitting data of the transmission control protocol service, and may continuously retransmit data due to failure to receive TCP ACK. In order to avoid the terminal device from continuously retransmitting data due to failure to receive TCP ACK after the NTN network device switches the communication mode between the terminal device and the normal mode to the store-and-forward mode, the terminal device may send a first indication message to the NTN network device to request the NTN network device to release the first data radio bearer, so as to interrupt the data transmission of the transmission control protocol service of the terminal device, thereby avoiding the terminal device from continuously retransmitting data due to failure to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0095] In a possible implementation of the embodiment of the present application, in step 501, if the communication mode of the terminal device is the store-and-forward mode and there is a first data radio bearer, the terminal device sends first indication information to the non-terrestrial network NTN network device, including:

[0096] A1. If the communication mode of the terminal device is the store-and-forward mode, and there is a first data radio bearer, and the service quality delay of the first data radio bearer is lower than a threshold, send first indication information to the NTN network device.

[0097] In the embodiment of the present application, if the service quality delay of the first data radio bearer is lower, it means that the terminal device needs to complete the data transmission of the transmission control protocol service in a shorter time. Therefore, if the service quality delay of the first data radio bearer used for the transmission control protocol service is lower than the threshold, it is more likely to cause the terminal device to retransmit data without receiving the TCP confirmation character in a short time, so the terminal device can actively request the NTN network device to release the first data radio bearer with a service quality delay lower than the threshold, and can release the first data radio bearer with a service quality delay lower than the threshold based on the reconfiguration message from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive the TCP confirmation character, thereby improving the utilization rate of transmission resources. Among them, the threshold can be set according to the actual situation.

[0098] In a possible implementation of the embodiment of the present application, in step 501, the terminal device sends first indication information to the non-terrestrial network NTN network device, including:

[0099] B1. The terminal device sends a terminal auxiliary information message to the NTN network device.

[0100] The terminal assistance information message includes first indication information.

[0101] In an embodiment of the present application, the terminal device may add the first indication information to the terminal assistance information message, and send the first indication information to the NTN network device by sending the terminal assistance information message to the NTN network device. It is understandable that when the communication technology between the NTN network device and the terminal device adopts the NTN technology, the terminal assistance information message (UE Assistance Information Message, UAI) is a new radio resource control (Radio Resource Control, RRC) message defined in the 5G R16 version specification, which is used to enhance the interactivity between the terminal device and the NTN network device. Through the terminal assistance information message, the terminal device can actively convey its real-time status to the NTN network device, including internal status parameters, energy-saving preferences, etc., so that the NTN network device side can better schedule resources and optimize resource allocation, thereby achieving more efficient communication and more energy-saving effects. By sending the first indication information to the NTN network device based on the terminal assistance information message, the terminal device can actively request the NTN network device to release the first data radio bearer, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to failure to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources. Specifically, when the communication technology between the NTN network device and the terminal device adopts IoT-NTN technology, the terminal assistance information message can specifically be a terminal assistance information narrowband message (UE Assistance Information-NarrowBand Message).

[0102] In the embodiment of the present application, the terminal assistance information message or the terminal assistance information narrowband message may be modified so that the terminal assistance information message or the terminal assistance information narrowband message carries the first indication information. Specifically, taking the terminal assistance information narrowband message as an example, the modified terminal assistance information narrowband message may be specifically as follows:

[0103] UE Assistance Information-NB message

[0104] UEAssistanceInformation-v1710-IEs ::= SEQUENCE {

[0105] overheatingAssistance-v1710 OverheatingAssistance-v1710OPTIONAL,

[0106] nonCriticalExtension UEAssistanceInformation-v19-IEs OPTIONAL

[0107] }

[0108] UEAssistanceInformation-v19-Ies ::= SEQUENCE {

[0109] drbIdRelease INTEGER(0..32) / / 0 –means All

[0110] }

[0111] Among them, the terminal assistance information narrowband message may include a "UEAssistanceInformation-v19-IEs" field and a "UEAssistanceInformation-v19-Ies ::= SEQUENCE {

[0112] drbIdRelease INTEGER(0..32) / / 0–means All

[0113] }", where the value of drbIdRelease includes: 0-indicates the release of all DRBs; other numbers-release the corresponding DRB ID.

[0114] In a possible implementation of an embodiment of the present application, the signaling carrying the first indication information includes at least one of the following: radio resource control RRC signaling, or the first media access control control element MAC CE, or uplink control signaling, or physical uplink control channel PUSCH. In an embodiment of the present application, the information query response message can be carried by any one of the signalings of radio resource control (RRC) signaling, the first media access control layer control element (MAC CE) signaling, uplink control signaling, and physical uplink shared channel (PUSCH). It can be understood that RRC signaling is mainly responsible for managing, configuring and controlling radio resources in a wireless communication system. MAC CE signaling is a control element in the MAC layer, which is used to transmit MAC layer control information between terminal devices and network devices. PUSCH is a physical channel used to carry uplink user data in mobile communication systems such as LTE and 5G. It is a shared channel in the uplink, allowing multiple users to share resources on the same physical channel in time-sharing, thereby improving the transmission efficiency of the network.

[0115] In a possible implementation of the embodiment of the present application, it also includes:

[0116] C1. If the communication mode of the terminal device is the store-and-forward mode and there is a second data radio bearer, the terminal device is prohibited from establishing a transmission control protocol connection.

[0117] The second data radio bearer is not used for transmission control protocol services.

[0118] In an embodiment of the present application, if the communication mode between the terminal device and the NTN network device is a store-and-forward mode, and there is a second data radio bearer that does not carry a transmission control protocol service, such as a second data bearer used to carry a user datagram protocol (UDP) service, the terminal device may not release the second data bearer, but prohibit the establishment of a transmission control protocol connection. Since the second data radio bearer is not used to carry the transmission control protocol service, it will not cause the terminal device to continuously retransmit data due to failure to receive TCP confirmation characters. Therefore, when there is a second data radio bearer that is not used to carry the transmission control protocol service between the terminal device and the NTN network device, the second data radio bearer can be prevented from starting to carry the transmission of the transmission control protocol service data by prohibiting the establishment of a new transmission control protocol connection, thereby avoiding the situation where the terminal device continuously retransmits data due to failure to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0119] In a possible implementation of the embodiment of the present application, step C1, the terminal device prohibits establishing a transmission control protocol connection, including:

[0120] C11. The terminal device sets the first flag.

[0121] The first flag bit is used to instruct the terminal device to prohibit establishing a transmission control protocol connection.

[0122] In an embodiment of the present application, the terminal device can prohibit the establishment of a transmission control protocol connection by setting the first flag bit. It is understandable that the first flag bit can be pre-set in the terminal device, and different values ​​of the first flag bit correspond to different states. For example, when the first flag bit is 0, the terminal device prohibits the establishment of a transmission control protocol connection; when the first flag bit is 1, the terminal device allows the establishment of a transmission control protocol connection. At this time, the terminal device can prohibit the establishment of a transmission control protocol connection by setting the first flag bit to 0, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0123] In a possible implementation of the embodiment of the present application, it also includes:

[0124] D1. If the communication mode of the terminal device is the store-and-forward mode and there is no data radio bearer, the terminal device is prohibited from initiating a protocol data unit session.

[0125] In an embodiment of the present application, if the communication mode between the terminal device and the NTN network device is a storage mode and there is no data wireless bearer, the terminal device may not need to request the NTN network device to release the data wireless bearer. However, in order to avoid the terminal device initiating the data transmission of a new transmission control protocol service, which causes the terminal device to continuously retransmit data because it cannot receive TCP confirmation characters, the terminal device may prohibit the initiation of a protocol data unit session, and specifically prohibit the initiation of a data transmission protocol data unit session. It can be understood that a protocol data unit (PDU) session refers to the process of communication between the terminal device and the NTN network device, and the protocol data unit session may include TCP services and UDP services. By prohibiting itself from initiating a protocol data unit session, the terminal device can avoid initiating a new transmission control protocol connection or establishing a new transmission control protocol service, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0126] In a possible implementation of the embodiment of the present application, step D1, the terminal device prohibits initiating a protocol data unit session, including:

[0127] D11. The terminal device sets the second flag.

[0128] The second flag bit is used to indicate that the terminal device is prohibited from initiating a protocol data unit session.

[0129] In an embodiment of the present application, the terminal device can prohibit the terminal device from initiating a protocol data unit session by setting the second flag bit. It is understandable that the second flag bit can be pre-set in the terminal device, and different values ​​of the second flag bit correspond to different states. For example, when the second flag bit is 0, the terminal device prohibits the initiation of a protocol data unit session; when the second flag bit is 1, the terminal device allows the initiation of a protocol data unit session. At this time, the terminal device can prohibit the initiation of a protocol data unit session by setting the second flag bit to 0, thereby avoiding the terminal device from initiating a new transmission control protocol connection or establishing a new transmission control protocol service, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0130] In a possible implementation of the embodiment of the present application, in step 501, the terminal device sends first indication information to the NTN network device, including:

[0131] E1. If the terminal device is in a radio resource control connection state with the NTN network device, the terminal device sends first indication information to the NTN network device.

[0132] In an embodiment of the present application, before the terminal device sends the first indication information to the NTN network device, it can first determine whether it is in a radio resource control connection state with the NTN network device. The radio resource control connection state can also be called the RRC connection state, which is a state in which a dedicated data transmission channel is established between the terminal device and the NTN network device, allowing both parties to perform efficient two-way data transmission. If the communication mode between the terminal device and the NTN network device is the store-and-forward mode, and is in the radio resource control connection state, and there is a first data radio bearer, the first indication information can be sent to the NTN network device, so that when there is a first data radio bearer for carrying the transmission control protocol service between the terminal device and the NTN network device, the terminal device can actively request the NTN network device to release the first data radio bearer, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0133] In a possible implementation of the embodiment of the present application, it also includes:

[0134] F1. If the terminal device is not in a radio resource control connection state with the NTN network device, the terminal device is prohibited from initiating a protocol data unit session.

[0135] In the embodiment of the present application, before the terminal device sends the first indication information to the NTN network device, it can first determine whether it is in a radio resource control connection state with the NTN network device. If the communication mode between the terminal device and the NTN network device is the store-and-forward mode, and the terminal device and the NTN network device are not in a radio resource control connection state, the terminal device can prohibit itself from initiating a protocol data unit session to avoid the terminal device initiating a new transmission control protocol connection or establishing a new transmission control protocol service, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive a TCP confirmation character, thereby improving the utilization rate of transmission resources.

[0136] In a possible implementation of the embodiment of the present application, step F1, the terminal device prohibits initiating a protocol data unit session, including:

[0137] F11. The terminal device sets the second flag.

[0138] The second flag bit is used to indicate that the terminal device is prohibited from initiating a protocol data unit session.

[0139] In an embodiment of the present application, the terminal device can prohibit the terminal device from initiating a protocol data unit session by setting the second flag bit. It is understandable that the second flag bit can be pre-set in the terminal device, and different values ​​of the second flag bit correspond to different states. For example, when the second flag bit is 0, the terminal device prohibits the initiation of a protocol data unit session; when the second flag bit is 1, the terminal device allows the initiation of a protocol data unit session. At this time, the terminal device can prohibit the initiation of a protocol data unit session by setting the second flag bit to 0, thereby avoiding the terminal device from initiating a new transmission control protocol connection or establishing a new transmission control protocol service, thereby avoiding the situation where the terminal device continuously retransmits data because it cannot receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0140] 502. The NTN network device receives first indication information from the terminal device.

[0141] The first indication information is used to request the NTN network device to release the first data radio bearer, and the first data radio bearer is used to carry the transmission control protocol service.

[0142] In the embodiment of the present application, in order to avoid the situation where the terminal device continuously retransmits data due to failure to receive TCP ACK after the NTN network device switches the communication mode between the terminal device and the normal mode to the store-and-forward mode, the NTN network device can receive first indication information from the terminal device so as to release the first data radio bearer based on the first indication information so as to interrupt the data transmission of the transmission control protocol service of the terminal device, thereby avoiding the terminal device continuously retransmitting data due to failure to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0143] 503. The NTN network device sends second indication information to the terminal device.

[0144] The second indication information is used to instruct the terminal device to delete the first data radio bearer.

[0145] In an embodiment of the present application, after receiving the first indication information from the terminal device, the NTN network device may send a second indication information to the terminal device to instruct the terminal device to delete the first data radio bearer. It can be understood that the NTN network device can specifically send the second indication information to the terminal device through a reconfiguration message, wherein the reconfiguration message can specifically be a radio resource control reconfiguration message (RRC Reconfiguration Message), which can also be referred to as an RRC reconfiguration message. The RRC reconfiguration message is a control message sent by the NTN network device to a terminal device in a radio resource control (RRC) connection state. The purpose of this message is to modify the existing RRC connection according to the needs of the network and the capabilities of the UE to optimize resource usage, improve communication quality or meet specific business needs. By sending the second indication information to the terminal device, the NTN network device can instruct the terminal device to delete the first data radio bearer so as to interrupt the data transmission of the transmission control protocol service of the terminal device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization of transmission resources.

[0146] In a possible implementation of an embodiment of the present application, the signaling carrying the second indication information includes at least one of the following: radio resource control RRC reconfiguration signaling, or a second media access control control element MAC CE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH. In an embodiment of the present application, the information query request can be carried by any one of the signalings of radio resource control (RRC) reconfiguration signaling, system message (SI), downlink control information (DCI) signaling, media access control layer control element (MAC CE) signaling, and physical downlink control channel (PDCCH). It can be understood that RRC signaling is mainly responsible for managing, configuring and controlling radio resources in a wireless communication system. SI contains a series of configuration information and control information broadcast by a network device to a terminal device, which is essential for the user equipment to correctly access the network, conduct data communication, and maintain network connection. DCI signaling is mainly used to transmit various downlink control information from a network device to a terminal device. MAC CE signaling is a control element in the MAC layer, which is used to transmit MAC layer control information between terminal devices and network devices.

[0147] 504. The terminal device receives second indication information from the NTN network device.

[0148] The second indication information is used to instruct the terminal device to delete the first data radio bearer.

[0149] In an embodiment of the present application, in order to improve the utilization rate of transmission resources, the terminal device can receive the second indication information from the NTN network device so as to delete the first data radio bearer to interrupt the data transmission of the transmission control protocol service of the terminal device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0150] 505. The terminal device deletes the first data radio bearer.

[0151] In the embodiment of the present application, after receiving the reconfiguration message carrying the second indication information from the NTN network device, the terminal device can delete the first data radio bearer according to the indication of the second indication information. It can be understood that since the second indication information instructs the terminal device to delete the first data radio bearer, the terminal device can delete the first data radio bearer between the terminal device and the NTN network device after receiving the second indication information from the NTN network device to interrupt the data transmission of the transmission control protocol service, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive the TCP confirmation character, thereby improving the utilization rate of transmission resources.

[0152] 506. The terminal device sends a first feedback message to the NTN network device.

[0153] In the embodiment of the present application, after the terminal device deletes the first data radio bearer according to the reconfiguration message carrying the second indication information from the NTN network device, the terminal device can send a first feedback message to the NTN network device so that the NTN network device can determine that the terminal device has deleted the first data radio bearer based on the second indication information. It can be understood that the first feedback message can specifically be an RRC reconfiguration complete message (RRC ReconfigurationComplete Message).

[0154] 507. The NTN network device receives a first feedback message from the terminal device.

[0155] In the embodiment of the present application, the NTN network device can determine that the terminal device has deleted the first data radio bearer between the terminal device and the NTN network device by receiving a first feedback message from the terminal device. It can be understood that the first feedback message can specifically be an RRC reconfiguration completion message.

[0156] 508. The NTN network device deletes the first data radio bearer.

[0157] In an embodiment of the present application, after receiving a feedback message from a terminal device and determining that the terminal device has deleted the first data radio bearer between the terminal device and the NTN network device, the NTN network device can delete the first data radio bearer between the terminal device and the NTN network device to complete the release process of the first data radio bearer between the terminal device and the NTN network device, so as to interrupt the data transmission of the transmission control protocol service of the terminal device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0158] In one possible implementation of an embodiment of the present application, the terminal device includes a new wireless NR device or an Internet of Things (IoT) terminal device; the NTN network device includes any one of an NTN base station, a satellite base station, a drone network device, a high-altitude platform network device, an aircraft network device, and a communication balloon network device.

[0159] It can be seen from the examples of the aforementioned embodiments that in order to improve the utilization rate of transmission resources, when the communication mode between the terminal device and the NTN network device is the store-and-forward mode, and there is a first data radio bearer for carrying the transmission control protocol service, the terminal device can actively request the NTN network device to release the first data radio bearer through the first indication information, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0160] See also Figure 6 , Figure 6 The figure is a schematic diagram of a second interaction process between an NTN network device and a terminal device provided in an embodiment of the present application. Another data radio bearer release method provided in an embodiment of the present application mainly includes the following steps:

[0161] 601. The NTN network device sends a capability query request to the terminal device.

[0162] In the embodiment of the present application, after the NTN network device establishes a radio resource control (Radio Resource Control, RRC) connection with the terminal device, the NTN network device can send a capability query request to the terminal device to obtain the various capabilities of the terminal device. Specifically, when the communication technology between the NTN network device and the terminal device adopts the NTN technology, the capability query request can be a terminal capability query message (UE Capability Enquiry Message); when the communication technology between the NTN network device and the terminal device adopts the IoT-NTN technology, the capability query request can be a terminal capability query request narrowband message (UE Capability Enquiry-NarrowBand Message).

[0163] It is understandable that in order to improve the service quality of the terminal device, the protocol can be modified based on the 3GPP TS36.306-i10 protocol, specifically:

[0164] Added section 4.3.15.25 to describe drbRelease-r19 capabilities;

[0165] 4.3.15.25 drbRelease-r19

[0166] This field indicates whether the UE supports drbRelease assistanceinformation as specified in TS 36.331 [5].

[0167] It can be understood that by making the above modifications based on the 3GPP TS36.306-i10 protocol, the terminal device can report whether it has the ability to support the release of the data radio bearer to the NTN network device, so that the NTN network device can determine whether the terminal device supports the release of the data radio bearer.

[0168] In a possible implementation of an embodiment of the present application, the signaling used to carry the capability query request may include one of radio resource control signaling, system message, downlink control information signaling, and media access control layer control element signaling. In an embodiment of the present application, the capability query request may be carried by any one of radio resource control signaling, system message, downlink control information signaling, and media access control layer control element signaling.

[0169] 602. The terminal device receives a capability query request from the NTN network device.

[0170] In the embodiment of the present application, after the NTN network device establishes a radio resource control connection with the terminal device, the terminal device can receive a capability query request from the NTN network device so as to report its own capabilities to the NTN network device, so that the NTN network device can learn the various capabilities of the terminal device.

[0171] 603. The terminal device sends a capability query response message to the NTN network device.

[0172] The capability query response message includes third indication information, and the third indication information is used to indicate whether the terminal device supports releasing the data radio bearer.

[0173] In the embodiment of the present application, after receiving the capability query request from the NTN network device, the terminal device can determine whether it has the capability to support the release of the data radio bearer, and generate a third indication information for indicating whether the terminal device supports the release of the data radio bearer. And the third indication information can be sent to the NTN network device based on the capability query response message, so that the NTN network device can determine whether the terminal device has the capability to support the release of the data radio bearer based on the third indication information carried by the capability query response message, so that the NTN network device can perform subsequent operations based on whether the terminal device supports the release of the data radio bearer. It can be understood that when the communication technology between the NTN network device and the terminal device adopts the NTN technology, the capability query response message can specifically be a terminal capability information message (UE Capability Information Message); when the communication technology between the NTN network device and the terminal device adopts the IoT-NTN technology, the capability query response message can specifically be a terminal capability information narrowband message (UE Capability Information-NarrowBand Message).

[0174] Specifically, the terminal capability information message or the terminal capability information narrowband message may be modified so that the terminal capability information message or the terminal capability information narrowband message carries the third indication information reported by the terminal device. Specifically, taking the terminal capability information narrowband message as an example, the modified terminal capability information narrowband message may be as follows:

[0175] UE-EUTRA-Capability-v16f0-IEs ::= SEQUENCE {

[0176] son-Parameters-v16f0 SON-Parameters-NB-v16f0,

[0177] nonCriticalExtension OtherConfig-NB-r19 OPTIONAL

[0178] }

[0179] OtherConfig-NB-r19 ::= SEQUENCE {

[0180] drbRelease-r19 ENUMERATED {supported} OPTIONAL

[0181] nonCriticalExtension SEQUENCE {} OPTIONAL

[0182] }

[0183] Among them, the terminal capability information narrowband message can add an "OtherConfig-NB-r19" field and "OtherConfig-NB-r19 ::= SEQUENCE {

[0184] drbRelease-r19 ENUMERATED {supported} OPTIONAL

[0185] nonCriticalExtension SEQUENCE {} OPTIONAL

[0186] }” field, where the “OtherConfig-NB-r19” field can be the third indication information.

[0187] In a possible implementation of an embodiment of the present application, the signaling used to carry the capability query response message may include one of a radio resource control response message, a media access control layer control element signaling, a physical random access channel message, and a physical uplink shared channel message. In an embodiment of the present application, the capability query response message may be carried by any one of a radio resource control response message, i.e., an RRC response message, a media access control layer control element signaling, i.e., a MAC CE signaling, a physical random access channel message, and a physical uplink shared channel message.

[0188] 604. The NTN network device receives a capability query response message from the terminal device.

[0189] The capability query response message includes third indication information, and the third indication information is used to indicate whether the terminal device supports releasing the data radio bearer.

[0190] In an embodiment of the present application, after the terminal device sends a capability query response message to the NTN network device, the NTN network device can receive the capability query response message from the terminal device, so that the NTN network device can determine the capability of the terminal device based on the capability query response message, so that the NTN network device can perform subsequent operations based on the capability of the terminal device.

[0191] 605. If the communication mode of the terminal device is the store-and-forward mode and there is a first data radio bearer, the terminal device sends first indication information to the NTN network device.

[0192] The first indication information is used to request the NTN network device to release the first data radio bearer, and the first data radio bearer is used to carry the transmission control protocol service.

[0193] 606. The NTN network device receives first indication information from the terminal device.

[0194] 607. The NTN network device sends second indication information to the terminal device.

[0195] The second indication information is used to instruct the terminal device to delete the first data radio bearer.

[0196] 608. The terminal device receives second indication information from the NTN network device.

[0197] 609. The terminal device deletes the first data radio bearer.

[0198] 610. The terminal device sends a first feedback message to the NTN network device.

[0199] 611. The NTN network device receives a first feedback message from the terminal device.

[0200] 612. The NTN network device deletes the first data radio bearer.

[0201] The above steps 605 to 612 are similar to steps 501 to 508 in the above embodiment and will not be described in detail here.

[0202] It can be seen from the examples of the above embodiments that in order to improve the utilization rate of transmission resources and the service quality of terminal devices, after the network device establishes a radio resource control connection with the terminal device, the network device can send a capability query request to the terminal device to obtain the various capabilities of the terminal device. When the communication mode between the terminal device and the NTN network device is a store-and-forward mode, and there is a first data radio bearer for carrying a transmission control protocol service, the terminal device can actively request the NTN network device to release the first data radio bearer through the first indication information, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0203] See also Figure 7 , Figure 7 The flowchart shown is a method for releasing a data radio bearer. The method is executed by a terminal device. The terminal device may execute steps 701 to 704 in the following method. The method for releasing a data radio bearer provided in an embodiment of the present application may include:

[0204] 701. If the communication mode of the terminal device is the store-and-forward mode and there is a first data radio bearer, the terminal device sends first indication information to the non-terrestrial network NTN network device.

[0205] 702. The terminal device receives second indication information from the NTN network device.

[0206] 703. The terminal device deletes the first data radio bearer.

[0207] 704. The terminal device sends a first feedback message to the NTN network device.

[0208] The above step 701 is similar to step 501 in the aforementioned embodiment, step 702 is similar to step 504 in the aforementioned embodiment, step 703 is similar to step 505 in the aforementioned embodiment, and step 704 is similar to step 506 in the aforementioned embodiment, which will not be described in detail here.

[0209] It can be seen from the examples of the aforementioned embodiments that in order to improve the utilization rate of transmission resources, when the communication mode between the terminal device and the NTN network device is the store-and-forward mode, and there is a first data radio bearer for carrying the transmission control protocol service, the terminal device can actively request the NTN network device to release the first data radio bearer through the first indication information, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0210] See also Figure 8 , Figure 8 The flowchart of a data radio bearer release method is shown. The method is executed by an NTN network device. The NTN network device can execute steps 801 to 804 in the following method. The data radio bearer release method provided by the embodiment of the present application may include:

[0211] 801. An NTN network device receives first indication information from a terminal device.

[0212] 802. The NTN network device sends second indication information to the terminal device.

[0213] 803. The NTN network device receives a first feedback message from the terminal device.

[0214] 804. The NTN network device deletes the first data radio bearer.

[0215] The above step 801 is similar to step 502 in the aforementioned embodiment, step 802 is similar to step 503 in the aforementioned embodiment, step 803 is similar to step 507 in the aforementioned embodiment, and step 804 is similar to step 508 in the aforementioned embodiment, which will not be described in detail here.

[0216] In the above implementation, in order to improve the utilization rate of transmission resources, after the NTN network device receives the first indication information from the terminal device for requesting the NTN network device to release the first data radio bearer, the second indication information can be sent to the terminal device, so that the terminal device can release the first data radio bearer based on the second indication information from the NTN network device. In addition, the NTN network device can also delete the first data radio bearer after receiving the feedback message from the terminal device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0217] In order to make the technical solution of the present application clearer and easier to understand, the positioning method of the present application is described in detail below in conjunction with a specific data transmission scenario between an NTN network device and a terminal device.

[0218] Fig. 9 A schematic diagram of a flow chart of a data radio bearer release method on the terminal side provided in an embodiment of the present application, the communication method in the embodiment of the present application includes:

[0219] S1. When the UE recognizes that the base station switches from Normal mode to S&F mode, this process is started and it is determined whether the UE and the base station are currently in an RRC connection state.

[0220] S2. If the UE and the base station are not currently in an RRC connection state, the second flag bit is set to prohibit the UE from initiating a data transmission PDU session.

[0221] S3. If the UE and the base station are currently in an RRC connection state and there is a DRB currently used to carry TCP services, the UE actively notifies the base station to release the DRB used to carry TCP services through UE Assistance Information signaling; then the base station sends an RRC reconfiguration message to instruct the UE to delete the DRB used to carry TCP services.

[0222] S4. The UE receives the RRC reconfiguration message from the base station, deletes the DRB used to carry the TCP service, and sends a feedback message to the base station.

[0223] S5. After receiving the feedback message, the base station deletes the DRB used to carry the TCP service.

[0224] S6. If the UE and the base station are currently in an RRC connection state and no DRB currently exists, the second flag bit is set to prohibit initiation of a data transmission PDU session.

[0225] S7. If the UE and the base station are currently in an RRC connection state and there is a DRB, but the DRB is not used to carry TCP services, the first flag bit is set to prohibit the UE from establishing a TCP connection.

[0226] It can be seen from the examples of the aforementioned embodiments that the embodiments of the present application provide a process and parameter design for dynamically releasing DRB by UE in connected state, which helps UE solve the problem of repeated packet sending of TCP connection on the terminal side in S&F mode.

[0227] Fig.10 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device may be a terminal device, and the communication device may include:

[0228] The sending module 1001 is used to send first indication information to the NTN network device if the communication mode of the terminal device is the store-and-forward mode and there is a first data radio bearer, wherein the first indication information is used to request the NTN network device to release the first data radio bearer, and the first data radio bearer is used to carry a transmission control protocol service;

[0229] A receiving module 1002 is configured to receive second indication information from the NTN network device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer;

[0230] The deleting module 1003 is configured to delete the first data radio bearer.

[0231] The sending module 1001 is further configured to send a first feedback message to the NTN network device.

[0232] In a possible implementation of the embodiment of the present application, the sending module 1001 is specifically configured to:

[0233] If the communication mode of the terminal device is the store-and-forward mode, and there is a first data radio bearer, and the service quality delay of the first data radio bearer is lower than a threshold, first indication information is sent to the NTN network device.

[0234] In a possible implementation of the embodiment of the present application, the sending module 1001 is specifically configured to:

[0235] Sending a terminal assistance information message UE Assistance Information Message to the NTN network device, where the terminal assistance information message includes the first indication information.

[0236] In a possible implementation of the embodiment of the present application, the device further includes:

[0237] A prohibition module is used to prohibit the establishment of a transmission control protocol connection if the communication mode of the terminal device is a store-and-forward mode and there is a second data radio bearer, and the second data radio bearer is not used for transmission control protocol services.

[0238] In a possible implementation of the embodiment of the present application, the prohibition module is specifically used to:

[0239] A first flag bit is set, where the first flag bit is used to indicate that the terminal device is prohibited from establishing a transmission control protocol connection.

[0240] In a possible implementation of the embodiment of the present application, the device further includes:

[0241] The prohibition module is used to prohibit the initiation of a protocol data unit PDU session if the communication mode of the terminal device is a store-and-forward mode and there is no data wireless bearer.

[0242] In a possible implementation of the embodiment of the present application, the device further includes:

[0243] The receiving module 1002 is further used to receive a capability query request from an NTN network device;

[0244] The sending module 1001 is further used to send a capability query response message to the NTN network device, where the capability query response message includes third indication information, and the third indication information is used to indicate whether the terminal device supports releasing the data radio bearer.

[0245] In a possible implementation of the embodiment of the present application, the sending module 1001 is specifically configured to:

[0246] If the wireless resource control connection state is established with the NTN network device, first indication information is sent to the NTN network device.

[0247] In a possible implementation of the embodiment of the present application, the device further includes:

[0248] The prohibition module is used to prohibit initiating a protocol data unit session if the communication mode of the terminal device is a store-and-forward mode and is not in a radio resource control connection state with the NTN network device.

[0249] In a possible implementation of the embodiment of the present application, the prohibition module is specifically used to:

[0250] A second flag bit is set, where the second flag bit is used to indicate that the terminal device is prohibited from initiating a protocol data unit session.

[0251] In a possible implementation of the embodiment of the present application, the terminal device includes a new wireless NR device or an Internet of Things IOT terminal device;

[0252] The NTN network equipment includes any one of an NTN base station, a satellite base station, an unmanned aerial vehicle network equipment, an aerial platform network equipment, an aircraft network equipment, and a communication balloon network equipment.

[0253] In a possible implementation manner of an embodiment of the present application, the signaling carrying the first indication information includes at least one of the following: radio resource control RRC signaling, or a first media access control element MAC CE, or uplink control signaling, or a physical uplink control channel PUSCH.

[0254] In a possible implementation method of an embodiment of the present application, the signaling carrying the second indication information includes at least one of the following: radio resource control RRC reconfiguration signaling, or a second media access control control element MAC CE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH.

[0255] It can be seen from the examples of the aforementioned embodiments that in order to improve the utilization rate of transmission resources, when the communication mode between the terminal device and the NTN network device is the store-and-forward mode, and there is a first data radio bearer for carrying the transmission control protocol service, the terminal device can actively request the NTN network device to release the first data radio bearer through the first indication information, and can release the first data radio bearer based on the second indication information from the NTN network device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0256] Fig.11 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device may be a NTN network device, and the communication device may include:

[0257] The receiving module 1101 is used to receive first indication information from a terminal device, where the first indication information is used to request the NTN network device to release a first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service;

[0258] A sending module 1102 is used to send second indication information to the terminal device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer;

[0259] The receiving module 1101 is configured to receive a first feedback message from the terminal device;

[0260] The deleting module 1103 is configured to delete the first data radio bearer.

[0261] In a possible implementation of the embodiment of the present application, the receiving module 1101 is specifically configured to:

[0262] A terminal assistance information message UE Assistance Information Message is received from a terminal device, where the terminal assistance information message includes the first indication information.

[0263] In a possible implementation of the embodiment of the present application, the device further includes:

[0264] The sending module 1102 is further configured to send a capability query request to the terminal device;

[0265] The receiving module is further used to receive a capability query response message from a terminal device, where the capability query response message includes third indication information, and the third indication information is used to indicate whether the terminal device supports releasing a data radio bearer.

[0266] In a possible implementation of the embodiment of the present application, the terminal device includes a new wireless NR device or an Internet of Things IOT terminal device;

[0267] The NTN network equipment includes any one of an NTN base station, a satellite base station, an unmanned aerial vehicle network equipment, an aerial platform network equipment, an aircraft network equipment, and a communication balloon network equipment.

[0268] In a possible implementation manner of an embodiment of the present application, the signaling carrying the first indication information includes at least one of the following: radio resource control RRC signaling, or a first media access control element MAC CE, or uplink control signaling, or a physical uplink control channel PUSCH.

[0269] In a possible implementation method of an embodiment of the present application, the signaling carrying the second indication information includes at least one of the following: radio resource control RRC reconfiguration signaling, or a second media access control control element MAC CE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH.

[0270] It can be seen from the examples of the above embodiments that in order to improve the utilization rate of transmission resources, after the NTN network device receives the first indication information from the terminal device for requesting the NTN network device to release the first data radio bearer, the second indication information can be sent to the terminal device, so that the terminal device can release the first data radio bearer based on the second indication information from the NTN network device. In addition, the NTN network device can also delete the first data radio bearer after receiving the first feedback message from the terminal device, thereby avoiding the terminal device from continuously retransmitting data due to the inability to receive TCP confirmation characters, thereby improving the utilization rate of transmission resources.

[0271] Fig.12 An example of the composition of an electronic device provided in an embodiment of the present application. The electronic device may be a first device, including but not limited to a base station and a core network unit. Fig.12 A simplified schematic diagram of the base station structure is shown. The base station includes part 1210, part 1220 and part 1230. Part 1210 is mainly used for baseband processing, controlling the base station, etc.; part 1210 is usually the control center of the base station, which can be usually called a processor, and is used to control the base station to perform the processing operation on the first device side in the above method embodiment. Part 1220 is mainly used to store computer program code and data. Part 1230 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals to baseband signals; part 1230 can usually be called a transceiver module, a transceiver, a transceiver circuit, or a transceiver. The transceiver module of part 1230 can also be called a transceiver or a transceiver, etc., which includes an antenna 1233 and a radio frequency circuit (not shown in the figure), wherein the radio frequency circuit is mainly used for radio frequency processing. Optionally, the device used to implement the receiving function in part 1230 can be regarded as a receiver, and the device used to implement the sending function can be regarded as a transmitter, that is, part 1230 includes a receiver 1232 and a transmitter 1231. A receiver may also be called a receiving module, a receiver, or a receiving circuit, etc., and a transmitter may be called a transmitting module, a transmitter, or a transmitting circuit, etc.

[0272] Part 1210 and part 1220 may include one or more single boards, each of which may include one or more processors and one or more memories. The processor is used to read and execute the program in the memory to realize the baseband processing function and the control of the base station. If there are multiple single boards, each single board can be interconnected to enhance the processing capability. As an optional implementation, multiple single boards may share one or more processors, or multiple single boards may share one or more memories, or multiple single boards may share one or more processors at the same time.

[0273] For example, in one implementation, the transceiver module of part 1230 is used to execute the transceiver-related process executed by the base station (first device) in the aforementioned method embodiment. The processor of part 1210 is used to execute the processing-related process executed by the base station in the aforementioned method embodiment.

[0274] It should be understood that Fig.12 The NTN network device including the processor, memory and transceiver may not rely on Fig.12 The structure shown.

[0275] Fig.13 Another example of the composition of an electronic device provided in an embodiment of the present application. The electronic device may be a second device, and the second device may be a terminal device, including but not limited to a mobile phone, a smart wearable device (such as a smart watch), and other electronic devices. Taking a mobile phone as an example, the electronic device may include a processor 310, an external memory interface 320, an internal memory 321, a display screen 330, a camera 340, an antenna 1, an antenna 2, a mobile communication module 350, and a wireless communication module 360, etc.

[0276] It is to be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device. In other embodiments, the electronic device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0277] The processor 310 may include one or more processing units, for example, the processor 310 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0278] It is understandable that the interface connection relationship between the modules illustrated in this embodiment is only a schematic illustration and does not constitute a structural limitation of the electronic device. In other embodiments of the present application, the electronic device may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0279] The external memory interface 320 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device. The external memory card communicates with the processor 310 through the external memory interface 320 to implement a data storage function. For example, files such as music and videos can be stored in the external memory card.

[0280] The internal memory 321 can be used to store computer executable program codes, and the executable program codes include instructions. The processor 310 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 321. The internal memory 321 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area may store data created during the use of the electronic device (such as audio data, a phone book, etc.), etc. In addition, the internal memory 321 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc. The processor 310 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 321, and / or the instructions stored in the memory provided in the processor.

[0281] The wireless communication function of the electronic device can be implemented through antenna 1, antenna 2, mobile communication module 350, wireless communication module 360, modem processor and baseband processor.

[0282] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in the electronic device can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of the antennas. For example, antenna 1 can be reused as a diversity antenna for a wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

[0283] The mobile communication module 350 can provide solutions for wireless communications including 2G / 3G / 4G / 5G applied in electronic devices. The mobile communication module 350 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The mobile communication module 350 can receive electromagnetic waves from the antenna 1, and filter, amplify, and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 350 can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1. In some embodiments, at least some of the functional modules of the mobile communication module 350 can be set in the processor 310. In some embodiments, at least some of the functional modules of the mobile communication module 350 can be set in the same device as at least some of the modules of the processor 310.

[0284] In some embodiments, the electronic device initiates or receives a call request through the mobile communication module 350 and the antenna 1 .

[0285] In addition, an operating system is running on the above components. For example, an iOS operating system, an Android operating system, a Windows operating system, etc. Applications can be installed and run on the operating system. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the explanation and beneficial effects of the relevant contents in any of the electronic devices provided above can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0286] The present application also provides a communication system, which may include: Fig.12 The first device shown (for example, a NTN network device such as a base station) and Fig.13 The second device shown (for example, a terminal device such as a mobile phone).

[0287] In this application, the terminal device or NTN network device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. Among them, the hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also called main memory). The operating system of the operating system layer may be any one or more computer operating systems that implement business processing through processes, such as Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system. The application layer may include applications such as browsers, address books, word processing software, and instant messaging software.

[0288] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0289] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0290] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0291] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0292] If the integrated module 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 part that essentially contributes to the technical solution of the present application or the whole or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or NTN network device, etc.) to execute all or part of the process of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory, random access memory, disk or optical disk and other media that can store program code.

[0293] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A data radio bearer release method, characterized in that: Applied to a terminal device, the method comprises: If the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, send first indication information to a non-terrestrial network NTN network device, where the first indication information is used to request the NTN network device to release the first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service; receiving second indication information from the NTN network device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer; The first data radio bearer is deleted, and a first feedback message is sent to the NTN network device.

2. The method according to claim 1, characterized in that If the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, sending first indication information to a non-terrestrial network NTN network device includes: If the communication mode of the terminal device is the store-and-forward mode, and there is a first data radio bearer, and the service quality delay of the first data radio bearer is lower than a threshold, first indication information is sent to the NTN network device.

3. The method according to claim 1 or 2, characterized in that: The sending of the first indication information to the non-terrestrial network NTN network device includes: Send a terminal assistance information message to the NTN network device, where the terminal assistance information message includes the first indication information.

4. The method according to claim 1, characterized in that: The method further comprises: If the communication mode of the terminal device is the store-and-forward mode and there is a second data radio bearer, establishing a transmission control protocol connection is prohibited, and the second data radio bearer is not used for transmission control protocol services.

5. The method according to claim 4, characterized in that The prohibition of establishing a transmission control protocol connection includes: A first flag bit is set, where the first flag bit is used to indicate that the terminal device is prohibited from establishing a transmission control protocol connection.

6. The method according to claim 1, characterized in that The method further comprises: If the communication mode of the terminal device is the store-and-forward mode and there is no data wireless bearer, initiating a protocol data unit PDU session is prohibited.

7. The method according to claim 1, characterized in that Before sending the first indication information to the non-terrestrial network NTN network device, the method further includes: Receive capability query requests from NTN network devices; A capability query response message is sent to the NTN network device, where the capability query response message includes third indication information, and the third indication information is used to indicate whether the terminal device supports releasing the data radio bearer.

8. The method according to claim 1, characterized in that: The sending of the first indication information to the non-terrestrial network NTN network device includes: If the wireless resource control connection state is established with the NTN network device, first indication information is sent to the NTN network device.

9. The method according to claim 6, characterized in that The method further comprises: If the communication mode of the terminal device is the store-and-forward mode and is not in a radio resource control connection state with the NTN network device, initiating a protocol data unit session is prohibited.

10. The method according to claim 6 or 9, characterized in that: The prohibition of initiating a protocol data unit session includes: A second flag bit is set, where the second flag bit is used to indicate that the terminal device is prohibited from initiating a protocol data unit session.

11. The method according to claim 1 or 2, characterized in that: The terminal device includes a new wireless NR device or an Internet of Things IOT terminal device; The NTN network equipment includes any one of an NTN base station, a satellite base station, an unmanned aerial vehicle network equipment, an aerial platform network equipment, an aircraft network equipment, and a communication balloon network equipment.

12. The method according to claim 1 or 2, characterized in that: The signaling carrying the first indication information includes at least one of the following: radio resource control RRC signaling, or a first media access control element MAC CE, or uplink control signaling, or a physical uplink control channel PUSCH.

13. The method according to claim 1 or 2, characterized in that: The signaling carrying the second indication information includes at least one of the following: radio resource control RRC reconfiguration signaling, or a second media access control element MAC CE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH.

14. A data radio bearer release method, characterized in that: Applied to non-terrestrial network NTN network equipment, the method comprises: Receiving first indication information from a terminal device whose communication mode is a store-and-forward mode, wherein the first indication information is used to request the NTN network device to release a first data radio bearer, wherein the first data radio bearer is used to carry a transmission control protocol service; Sending second indication information to the terminal device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer; Receiving a first feedback message from the terminal device; The first data radio bearer is deleted.

15. The method according to claim 14, characterized in that The receiving first indication information from the terminal device includes: A terminal assistance information message is received from a terminal device, where the terminal assistance information message includes the first indication information.

16. The method according to claim 14, characterized in that The method further comprises: Sending a capability query request to the terminal device; A capability query response message is received from a terminal device, where the capability query response message includes third indication information, and the third indication information is used to indicate whether the terminal device supports releasing a data radio bearer.

17. The method according to any one of claims 14 to 16, characterized in that The terminal device includes a new wireless NR device or an Internet of Things IOT terminal device; The NTN network equipment includes any one of an NTN base station, a satellite base station, an unmanned aerial vehicle network equipment, an aerial platform network equipment, an aircraft network equipment, and a communication balloon network equipment.

18. The method according to any one of claims 14 to 16, characterized in that The signaling carrying the first indication information includes at least one of the following: radio resource control RRC signaling, or a first media access control element MAC CE, or uplink control signaling, or a physical uplink control channel PUSCH.

19. The method according to any one of claims 14 to 16, characterized in that The signaling carrying the second indication information includes at least one of the following: radio resource control RRC reconfiguration signaling, or a second media access control element MACCE, or a system message, or downlink control information DCI, or a physical downlink control channel PDCCH.

20. A data radio bearer release method, characterized in that: Applied to terminal equipment and non-terrestrial network NTN network equipment, the terminal equipment executes the following method: If the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, send first indication information to a non-terrestrial network NTN network device, where the first indication information is used to request the NTN network device to release the first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service; receiving second indication information from the NTN network device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer; Deleting the first data radio bearer, and sending a first feedback message to the NTN network device; The NTN network device performs the following method: receiving first indication information from a terminal device, where the first indication information is used to request the NTN network device to release a first data radio bearer, where the first data radio bearer is used to carry a transmission control protocol service; Sending second indication information to the terminal device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer; Receiving a first feedback message from the terminal device; The first data radio bearer is deleted.

21. A communication device, characterized in that: The communication device is specifically a terminal device, and the communication device includes: A sending module, configured to send first indication information to a non-terrestrial network NTN network device if the communication mode of the terminal device is a store-and-forward mode and there is a first data radio bearer, wherein the first indication information is used to request the NTN network device to release the first data radio bearer, and the first data radio bearer is used to carry a transmission control protocol service; A receiving module, used for receiving second indication information from the NTN network device, where the second indication information is used for instructing the terminal device to delete the first data radio bearer; a deleting module, configured to delete the first data radio bearer, The sending module is further used to send a first feedback message to the NTN network device.

22. A communication device, characterized in that: The communication device is specifically a non-terrestrial network NTN network device, and the communication device includes: A receiving module, configured to receive first indication information from a terminal device whose communication mode is a store-and-forward mode, wherein the first indication information is used to request the NTN network device to release a first data radio bearer, wherein the first data radio bearer is used to carry a transmission control protocol service; A sending module, used to send second indication information to the terminal device, where the second indication information is used to instruct the terminal device to delete the first data radio bearer; A receiving module, configured to receive a first feedback message from the terminal device; A deleting module is used to delete the first data radio bearer.

23. A communication device, characterized in that: The communication device comprises: Memory for storing computer programs or computer instructions; A processor, configured to execute a computer program or computer instruction stored in the memory, so that the communication device performs the method according to any one of claims 1 to 13, or so that the communication device performs the method according to any one of claims 14 to 19.

24. A communication system, characterized in that: The communication system includes terminal equipment and NTN network equipment: The terminal device is used to execute the method according to any one of claims 1 to 13, and the NTN network device is used to execute the method according to any one of claims 14 to 19.

25. A computer storage medium for storing a computer program, wherein when the computer program is executed, it is used to implement the method according to any one of claims 1 to 13, or to implement the method according to any one of claims 14 to 19.

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