State transition method, apparatus, device and storage medium

Abstract

The present application discloses a state transition method, an apparatus, a device and a storage medium, which are related to the field of mobile communication. In the method, a relay terminal is connected to an access network device, and the relay terminal is connected to at least one communication terminal, and the communication terminal is connected to the access network device via the relay terminal, the method includes the steps of controlling at least one communication terminal to leave a connection state with the access network device, and when it is determined that all communication terminals connected to the access network device via the relay terminal have left a connection state with the access network device, sending a first control message to the relay terminal, the first control message is used to instruct the relay terminal to leave a connection state with the access network device, preventing the relay terminal from still being in a connection state with the access network device, saving resource consumption of the relay terminal, and further improving the communication quality of the relay terminal.

Description

[Technical Field]

[0001] The present application relates to the field of mobile communications, and in particular to a state transition method, an apparatus, a device, and a storage medium. [Background technology]

[0002] With the rapid development of mobile communication technology and the widespread use of terminals, a communication method using terminals as a medium has been proposed, in which any terminal can be connected to a core network through another terminal as a medium and communicate with the core network.

[0003] Taking a communication terminal and a relay terminal as an example, the communication terminal establishes a connection with the relay terminal, and the relay terminal establishes a connection with the core network to which the relay terminal belongs via an access network device. At this time, the relay terminal transitions to a CM (Connection Management)-connected state. Then, the communication terminal is connected to the access network device via the relay terminal, and further connected to the core network to which the communication terminal belongs via the access network device, and the communication terminal also transitions to a CM-connected state and further communicates with the core network to which the communication terminal belongs.

[0004] However, when the communication terminal no longer needs to communicate, it transitions to a CM-idle state or a radio resource control inactive state, but the state of the relay terminal remains unchanged and in a CM-connected state, so the resources of the relay terminal are in a consumed state and the resource utilization rate is low. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present application provide a state transition method, an apparatus, a device, and a storage medium, which prevent the relay terminal from remaining connected to the access network device when a communication terminal connected to an access network device via a relay terminal leaves the connection state with the access network device, thereby saving the resource consumption of the relay terminal and further improving the communication quality of the relay terminal. [Means for solving the problem]

[0006] According to one aspect of the present application, there is provided a state transition method applied to an access network device, wherein a relay terminal is connected to the access network device, and the relay terminal is connected to at least one communication terminal, and the communication terminal is connected to the access network device via the relay terminal, and the state transition method includes: controlling the at least one communication terminal to disconnect from the access network device; and a step of transmitting a first control message to the relay terminal when it is determined that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, wherein the first control message is used to instruct the relay terminal to leave the connection state with the access network device.

[0007] According to one aspect of the present application, there is provided a state transition method applied to a relay terminal, the relay terminal being connected to an access network device, and the relay terminal being connected to at least one communication terminal, and the communication terminal being connected to the access network device via the relay terminal, the state transition method comprising: receiving a first control message sent by the access network device; and disconnecting from the access network device based on the first control message; When the access network device determines that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, the first control message is transmitted by the access network device.

[0008] According to one aspect of the present application, there is provided a state transition apparatus applied to an access network device, wherein a relay terminal is connected to the access network device, and the relay terminal is connected to at least one communication terminal, and the communication terminal is connected to the access network device via the relay terminal, and the state transition apparatus comprises: a control module configured to control the at least one communication terminal to disconnect from the access network device; and a transmitting module configured to transmit a first control message to the relay terminal when it is determined that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, the first control message being used to instruct the relay terminal to leave the connection state with the access network device.

[0009] According to one aspect of the present application, there is provided a state transition apparatus applied to a relay terminal, the relay terminal being connected to an access network device, and the relay terminal being connected to at least one communication terminal, and the communication terminal being connected to the access network device via the relay terminal, the state transition apparatus comprising: a receiving module configured to receive a first control message transmitted by the access network device; a disassociation module configured to disassociate from the access network device based on the first control message; When the access network device determines that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, the first control message is transmitted by the access network device.

[0010] According to one aspect of the present application, there is provided an access network device comprising a processor, a transceiver connected to the processor, and a memory for storing executable program code for the processor, the processor being configured to load and execute the executable program code to implement the state transition method described in the previous aspect.

[0011] According to one aspect of the present application, there is provided a relay terminal comprising a processor, a transceiver connected to the processor, and a memory for storing executable program code of the processor, the processor being configured to load and execute the executable program code to implement the state transition method described in the aforementioned aspect.

[0012] According to one aspect of the present application, a computer-readable storage medium is provided, the readable storage medium storing executable program code, the executable program code being loaded and executed by a processor to realize the state transition method described in the aforementioned aspect.

[0013] According to one aspect of the present application, a chip is provided, the chip including a programmable logic circuit and / or program instructions, which, when executed on an access network device or a relay terminal, implements the state transition method described in the previous aspect.

[0014] According to one aspect of the present application, an embodiment of the present application provides a computer program product, which, when executed by a processor of an access network device or a relay terminal, implements the state transition method according to the previous aspect.

[0015] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0016] The method, apparatus, device, and storage medium provided by the embodiments of the present application enable an access network device to control the relay terminal to disconnect from the access network device when it determines that a communication terminal connected to the access network device via a relay terminal has left the connection state with the access network device, thereby preventing the relay terminal from remaining connected to the access network device when the communication terminal connected to the access network device via the relay terminal has left the connection state with the access network device, thereby saving resource consumption of the relay terminal and improving the communication quality of the relay terminal. [Brief explanation of the drawings]

[0017] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly introduces the drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can obtain other drawings from these drawings without creative efforts. [Figure 1] FIG. 1 shows a schematic structural diagram of a network structure provided by an exemplary embodiment of the present application. [Figure 2] FIG. 2 shows a block diagram of communication between a communication terminal and a relay terminal provided by an exemplary embodiment of the present application. [Figure 3] FIG. 3 shows a block diagram of a communication system provided by an exemplary embodiment of the present application. [Figure 4] FIG. 4 shows a flowchart of a communication method provided by an exemplary embodiment of the present application. [Figure 5] FIG. 5 shows a flowchart of a state transition method provided by an exemplary embodiment of the present application. [Figure 6] FIG. 6 shows a flowchart of a state transition method provided by an exemplary embodiment of the present application. [Figure 7] FIG. 7 shows a flowchart of a state transition method provided by an exemplary embodiment of the present application. [Figure 8] FIG. 8 shows a block diagram of a state transition device provided by an exemplary embodiment of the present application. [Figure 9] FIG. 9 shows a block diagram of a state transition device provided by another exemplary embodiment of the present application. [Figure 10] FIG. 10 shows a block diagram of a state transition device provided by an exemplary embodiment of the present application. [Figure 11] FIG. 11 shows a block diagram of a state transition device provided by another exemplary embodiment of the present application. [Figure 12] FIG. 12 shows a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0018] To make the objectives, technical solutions and advantages of the present application clearer, the following describes the embodiments of the present application in more detail with reference to the accompanying drawings.

[0019] First, terms used in the embodiments of the present application will be explained.

[0020] Network System Architecture: In an embodiment of the present application, the network system architecture is shown in Figure 1. The network system architecture includes a terminal, an access network, a UPF (User Plane Function) network element, an external data network, an AMF (Access Management Function) network element, an SMF (Session Management Function) network element, a PCF (Policy Control function) network element, an AF (Application Function) network element, an NSSF (Network Slice Selection Function) network element, an AUSF (Authentication Server Function) network element, and a UDM (Unified Data Management) network element. The terminal establishes an access stratum connection with the access network via a Uu (a certain communication interface) interface, exchanges access stratum messages, and performs wireless data transmission. The terminal establishes a non-access stratum connection with the AMF network element via an N1 (a certain communication interface) interface, and exchanges NAS (None Access Stratum) messages. Among these, the AMF network element has mobility management functions in the core network, and the SMF has session management functions in the core network. In addition to managing the mobility of terminals, the AMF network element is also responsible for transferring session management messages between terminals and SMF network elements. The AMF network element exchanges data with the SMF network element through N11 (a certain communication interface). The PCF network element has policy management functions within the core network and is responsible for formulating policies related to terminal mobility management, session management, charging, etc., and exchanges data with the SMF network element through the N7 (a certain communication interface) interface.Furthermore, the PCF network element exchanges data with the AMF via the N15 (a certain communication interface) interface. The UPF network element has a user plane function in the core network and transmits data with an external data network via the N6 (a certain communication interface) interface and with the access network via the N3 (a certain communication interface) interface. After a terminal accesses the mobile communication network via the Uu interface, a PDU session for data transmission is established under the control of the SMF network element. The NSSF network element exchanges data with the AMF network element via the N22 (a certain communication interface) interface. The AUSF network element exchanges data with the AMF network element via the N12 (a certain communication interface) interface and with the UDM network element via the N13 (a certain communication interface) interface. The UDM network element exchanges data with the AMF network element via the N8 (a certain communication interface) interface and with the SMF network element via the N10 (a certain communication interface) interface.

[0021] Terminal state: There are two connection management states between a terminal registered in a network and an AMF: an idle state or a connected state. When a connection between a terminal and an access network device is established, the access network device establishes a connection with the AMF, allowing the terminal to exchange NAS messages with the AMF. At this time, the terminal is in the CM-connected state, and the AMF also marks the terminal state as the CM-connected state. When the connection between the terminal and the access network device is released, the terminal enters the CM-idle state, the connection between the access network device and the AMF is also released, and the AMF also marks the terminal state as the CM-idle state. When the connection between the terminal and the access network device is suspended, and the terminal's CM-connected radio connection is in an inactive state, the connection between the access network device and the AMF continues to be maintained, and the AMF continues to mark the UE state as the CM-connected state.

[0022] Relay terminal and communication terminal: In the embodiment of the present application, the relay terminal and the communication terminal are terminals equipped with Prose (Proximity Services) functions, and the relay terminal and the communication terminal can establish a connection and communicate via a PC5 interface. Also, as shown in FIG. 2, the relay terminal can not only connect to an access network device via a mobile communication network, but also be used as a relay terminal. After the communication terminal establishes a connection with the relay terminal via the PC5 interface, the relay terminal establishes a connection with the access network device via the Uu interface, and the communication terminal connects to the access network device via the relay terminal as a medium, exchanging data with the core network to which the communication terminal belongs. Also, the communication terminal exchanges messages with the access layer via an NG (a certain communication interface) interface.

[0023] 3 shows a block diagram of a communication system provided by an exemplary embodiment of the present application, which may include an access network 12, a relay terminal 13, and a communication terminal 14.

[0024] The access network 12 includes several network devices 120. The network devices 120 may be base stations, which are devices deployed in an access network to provide wireless communication functions to terminals. Base stations may include various forms such as macro base stations, micro base stations, relay stations, and access points. In systems using different radio access technologies, devices with base station functions may have different names. For example, in an LTE system, they are called eNodeBs or eNBs, and in a 5G NR-U system, they are called gNodeBs or gNBs. As communication technologies evolve, the definition of a "base station" may also change. For convenience of the embodiments of the present application, the above-mentioned devices that provide wireless communication functions to relay terminals 13 will be collectively referred to as access network devices.

[0025] The relay terminal 13 and the communication terminal 14 may include various forms of user equipment, such as handheld devices with various wireless communication capabilities, in-vehicle devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as mobile stations (MS) and terminal devices. For convenience of explanation, the above devices are collectively referred to as terminals. The access network device 120 and the relay terminal 13 communicate via an air interface technology such as a Uu interface, and the relay terminal 13 and the communication terminal 14 are connected via short-range communication.

[0026] The technical solutions of the embodiments of the present application may be used in a variety of systems, such as a Global System of Mobile communication (GSM®) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA®) system, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE®) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an Advanced Long Term Evolution (LTE-A) system, a New Radio (NR) system, an evolution of the NR system, an LTE-based access to unlicensed spectrum (LTE-U) system, an NR-U system, a Universal Mobile Telecommunication System (UMTS), a Worldwide Interoperability for Microwave Access (WIDE) system, a LTE-based access to unlicensed spectrum (LTE-U) system, a NR-U system, a Universal Mobile Telecommunication System (UMTS), a LTE-based access to unlicensed spectrum (LTE-U ... The present invention can be applied to various communication systems such as Microwave Access (WiMAX) communication systems, wireless local area networks (WLANs), wireless fidelity (WiFi), next generation communication systems, and other communication systems.

[0027] Generally, conventional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems support not only traditional communication but also Device to Device (D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, Vehicle to Everything (V2X) systems, etc. The embodiments of the present application can also be applied to these communication systems.

[0028] First, a process in which a communication terminal connects to an access network device via a relay terminal will be described. For example, Figure 4 shows a flowchart of a communication method provided by an exemplary embodiment of the present application, which is applied to the communication terminal, relay terminal, and access network device described in Figure 1, and the method includes at least part of the following contents:

[0029] At 401, a communication terminal establishes a connection with a relay terminal.

[0030] In an embodiment of the present application, when both the communication terminal and the relay terminal have short-range communication capabilities and the communication terminal and the relay terminal are located within a short-range communication range, the communication terminal and the relay terminal establish a short-range communication connection.

[0031] In some embodiments, the relay terminal has a short-range communication capability and continuously transmits a broadcast message, which is used to indicate that the relay terminal can provide a relay service for connections of other terminals. When a communication terminal needs to perform data transmission but is currently unable to connect to an access network device and scans and obtains the broadcast message transmitted from the relay terminal, the communication terminal transmits a connection request message to the relay terminal, and the relay terminal establishes a short-range communication connection with the communication terminal based on the connection request message.

[0032] Here, the communication terminal establishes a short-range communication connection with the relay terminal via a PC5 (a communication interface) interface.

[0033] At 402, the relay terminal establishes a connection with an access network device, and through the connection with the access network device, establishes a connection with a core network to which the relay terminal belongs.

[0034] In an embodiment of the present application, after the relay terminal and the communication terminal establish a short-range communication connection, the communication terminal can trigger the establishment of a connection between the relay terminal and the access network device, and further establish a connection with the core network to which the relay terminal belongs based on the connection with the access network device.

[0035] Here, when the relay terminal is located within the broadcast range of the access network device and has already established a short-range communication connection with the communication terminal, the relay terminal sends a connection establishment request to the access network device, and the access network device establishes a connection with the relay terminal based on the connection establishment request. After establishing a connection with the access network device, the relay terminal can also establish a connection with the core network to which the relay terminal belongs through the connection with the access network device.

[0036] In some embodiments, the core network is an AMF network element or other network element, but is not limited to the embodiments of the present application.

[0037] After establishing a connection with the core network to which it belongs, the relay terminal enters a CM-connected state.

[0038] In 403, the relay terminal exchanges NAS messages with the core network to which the relay terminal belongs via the connected access network device.

[0039] At 404, the communication terminal establishes a connection with the access network device via the relay terminal.

[0040] In the embodiment of the present application, after the communication terminal and the relay terminal establish a short-range communication connection through step 201, the relay terminal can perform a forwarding service, and the communication terminal establishes a connection with an access network device through the short-range communication connection with the relay terminal.

[0041] The relay device is a forwarding device, and after receiving a communication message sent by a communication terminal, the relay terminal directly transmits the communication message to a connected access network device. In fact, the relay terminal is a device for transparent transmission, and the connection between the communication terminal and the access network device is realized through the relay terminal.

[0042] In the embodiment of the present application, an example will be described in which 401 is executed before 402 to 403, and 402 to 403 are executed before step 404. In other embodiments, 401 may be executed after 402 to 403, and 404 may be executed before 402 to 403, or they may be executed in another order, and the present application does not limit the sequential execution order of 401, 402 to 403, and 404.

[0043] At 405, the communications terminal exchanges NAS messages with the core network to which the communications terminal belongs via the connected access network device.

[0044] In an embodiment of the present application, after a communication terminal is connected to an access network device via a relay terminal, the communication terminal can establish a connection with a core network to which the communication terminal belongs based on the connection with the access network device, and the communication device can exchange NAS messages with the core network to which the communication terminal belongs.

[0045] Here, the core network to which the communication terminal belongs may be an AMF network element or other network element, but is not limited to these in the embodiments of the present application.

[0046] After establishing a connection with the core network to which it belongs, the relay terminal enters a CM-connected state.

[0047] In the communication method provided by the embodiment of the present application, a relay terminal is used as a medium, and the communication terminal is connected to an access network device through the relay terminal, and then the communication terminal exchanges NAS messages with the core network to which the communication terminal belongs based on the connection with the access network device. The relay terminal extends the coverage area of ​​the access network device and improves the efficiency of connecting the communication terminal and the access network device to realize communication.

[0048] The embodiment of FIG. 4 illustrates a process in which a communication terminal establishes a connection with a core network to which the communication terminal belongs via a relay terminal, and realizes communication. Meanwhile, the communication terminal may disconnect from the access network device, and the access network device controls the state of the relay terminal based on the state of the communication terminal. For specific processes, refer to FIG. 5. In addition, in the present application, the embodiment of FIG. 4 and the embodiment of FIG. 5 may be independent embodiments, or the embodiment of FIG. 4 and the embodiment of FIG. 5 may be combined. FIG. 5 illustrates a flowchart of a state transition method provided by an exemplary embodiment of the present application, which is applied to the communication terminal, relay terminal, and access network device shown in FIG. 1. Here, the relay terminal is connected to the access network device, and the relay terminal is connected to at least one communication terminal, and the communication terminal is connected to the access network device via the relay terminal. The method includes at least some of the following contents:

[0049] In 501, an access network device controls at least one communication terminal to leave a connection state with the access network device.

[0050] In an embodiment of the present application, at least one communication terminal is connected to the access network device, and each communication terminal can communicate with a core network to which the communication terminal belongs based on the access network device. If the communication terminal has no ongoing service, the communication terminal needs to disconnect from the access network device, and the access network device controls the communication terminal to disconnect from the access network device.

[0051] Here, the communication terminal is currently connected to the access network device, and the connection state is a CM-connected state.

[0052] In the embodiment of the present application, there are two cases in which a communication terminal disconnects from a connection state with an access network device. The first case is when the communication terminal releases the radio connection with the access network device and transitions to a CM-idle state. The second case is when the communication terminal suspends the radio connection with the access network device and transitions to a radio resource control inactive state.

[0053] For the first case, the access network device sends a second radio connection release message to the at least one communication terminal.

[0054] The second radio connection release message is used to instruct the communications terminal to transition to the CM-idle state.

[0055] Since the access network device needs to control at least one connected communication terminal to leave the connection state with the access network device, the access network device sends a second wireless connection release message to the at least one communication terminal, and when the communication terminal receives the second wireless connection release message sent by the access network device, it transitions to a CM-idle state based on the second wireless connection release message, and at this time, the communication terminal no longer communicates with the access network device.

[0056] For the second case, a second wireless connection suspend message is sent to at least one communication terminal.

[0057] Here, the second radio connection suspend message is used to instruct the communication terminal to transition to the radio resource control inactive state.

[0058] Since the access network device needs to control at least one connected communication terminal to leave the connection state with the access network device, the access network device sends a second radio connection suspend message to the at least one communication terminal, and after receiving the second radio connection suspend message sent by the access network device, the communication terminal transitions to a radio resource control inactive state based on the second radio connection release message, at which time the communication terminal no longer communicates with the access network device.

[0059] In the embodiment of the present application, an example will be described in which the relay terminal and the access network device are in a connected state. In another embodiment, the relay terminal first needs to connect to the access network device, and the relay terminal determines that it needs to establish a connection with the access network device via a wireless connection with the communication terminal, and sends a connection establishment request to the access network device. The access network device accesses the connection establishment request sent from the relay terminal via the connection with the communication terminal, and establishes a wireless connection with the relay terminal.

[0060] In 502, when it is determined that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, the access network device transmits a first control message to the relay terminal.

[0061] Here, the first control message is used to instruct the relay terminal to leave the connection state with the access network device.

[0062] In an embodiment of the present application, an access network device controls at least one communication terminal connected to the access network device to leave the connection state with the access network device, and the access network device records the communication terminals connected to the access network device via a relay terminal, so that for a certain relay terminal, when all communication terminals connected to the access network device via the relay terminal leave the connection state with the access network device, it means that the relay terminal does not need to maintain the connection state with the access network device, and the access network device sends a first control message to the relay terminal to control the relay terminal to leave the connection state with the access network device.

[0063] At 503, the relay terminal receives a first control message sent by the access network device.

[0064] At 504, the relay terminal disconnects from the access network device based on the first control message.

[0065] After receiving the first control message sent by the access network device, the relay terminal determines that all communication terminals connected to the access network device through the relay terminal have left the connection state with the access network device, and therefore, the relay terminal leaves the connection state with the access network device based on the received first control message.

[0066] In some embodiments, when a relay terminal leaves a connection with an access network device, two cases are included.

[0067] In the first case, the relay terminal enters a CM-idle state and / or an RRC (Radio Resource Control)-idle state.

[0068] Here, the first control message sent by the access network device to the relay terminal is a first radio connection release message, and after receiving the first radio connection release message, the relay terminal enters a CM-idle state and / or an RRC-idle state.

[0069] In some embodiments, after receiving a first wireless connection release message, the relay terminal may perform a state transition operation based on the first wireless connection release message, and the state transition operation to be performed includes the following three cases: (1) The relay terminal enters the CM-idle state. (2) The relay terminal enters the RRC-idle state. (3) The relay terminal enters the CM-idle state and the RRC-idle state.

[0070] After receiving the first radio connection release message, the relay terminal simultaneously enters the CM-idle state and the RRC-idle state, or, after receiving the first radio connection release message, the relay terminal first enters the RRC-idle state and then transitions to the CM-idle state based on the RRC-idle state.

[0071] In some other embodiments, the access network device not only sends the first radio connection release message to the relay terminal, but also sends a context release message to the core network to which the relay terminal is connected.

[0072] Here, the context release message is used to instruct the core network to which the relay terminal is connected to release the context information of the relay terminal, which is used for data exchange between the relay terminal and the core network to which the relay terminal is connected.

[0073] The access network device controls the relay terminal to release the radio connection of the relay terminal and control the relay terminal to enter a CM-idle state and / or an RRC-idle state, so that the relay terminal no longer needs to communicate with the core network to which the relay terminal belongs. At this time, the access network device sends a context release message to the core network to which the relay terminal is connected, and the core network to which the relay terminal is connected releases the context information of the relay terminal based on the context release message.

[0074] In some embodiments, when the access network device sends a second radio connection release message to at least one communication terminal, or when the access network device sends a second radio connection suspend message to at least one communication terminal, the access network device performs a step of sending a first radio connection release message to the relay terminal.

[0075] For example, Figure 6 shows a flowchart of a state transition method provided by an exemplary embodiment of the present application. As shown in Figure 6, a communication terminal establishes a short-range communication connection with a relay terminal, and the relay terminal establishes a connection with a core network to which the relay terminal belongs via a connected access network device, and exchanges NAS messages with the core network to which the relay terminal belongs. After establishing a connection with the access network device through the relay terminal, the communication terminal establishes a connection with the core network to which the communication terminal belongs, and exchanges NAS messages with the core network to which the communication terminal belongs. The access network device sends a radio connection release message to the communication terminal, and when it determines that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, the access network device sends a radio connection release message or a radio connection suspend message to the relay terminal.

[0076] In the second case, the relay terminal enters the radio resource control inactive state.

[0077] Wherein, the first control message sent by the access network device to the relay terminal is a first radio connection suspend message, and the relay terminal enters a radio resource control inactive state after receiving the first radio connection suspend message, and at this time, the relay terminal transitions to a radio resource control inactive state in a CM-connected state.

[0078] In some embodiments, when the access network device sends a second radio connection suspend message to the at least one communication terminal, the access network device performs the step of sending a first radio connection suspend message to the relay terminal.

[0079] In some other embodiments, when the access network device transmits a second radio connection suspend message to some communication terminals among the plurality of communication terminals and transmits a second radio connection release message to other communication terminals among the plurality of communication terminals, the access network device performs a step of transmitting a first radio connection suspend message to a relay terminal.

[0080] For example, Figure 7 shows a flowchart of a state transition method provided by an exemplary embodiment of the present application. As shown in Figure 7, a communication terminal establishes a short-range communication connection with a relay terminal, and the relay terminal establishes a connection with a core network to which the relay terminal belongs via a connected access network device, and exchanges NAS messages with the core network to which the relay terminal belongs. After establishing a connection with the access network device through the relay terminal, the communication terminal establishes a connection with the core network to which the communication terminal belongs, and exchanges NAS messages with the core network to which the communication terminal belongs. The access network device sends a radio connection suspend message to the communication terminal, and when it determines that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, the access network device sends a radio connection suspend message to the relay terminal.

[0081] Here, the embodiments of Figures 6 and 7 are merely exemplary explanations of the present application, and the process in Figures 6 and 7 in which a communication terminal establishes a connection with an access network device via a relay terminal is merely an exemplary explanation, and steps 501 to 504 of the present application are not limited to being performed based on the process in which a communication terminal establishes a connection with an access network device via a relay terminal.

[0082] The second point that needs to be explained is that the embodiments of the present application will be described by taking an example in which an access network device determines that all communication terminals connected to the access network device via a relay terminal will be disconnected from the access network device. In another embodiment, the access network device not only determines that all communication terminals connected to the access network device via a relay terminal will be disconnected from the access network device, but also transmits first control information to the relay terminal when it determines that there is no service transmission between the relay terminal itself and the core network connected to it, so that the relay terminal will be disconnected from the access network device, thereby improving the accuracy of the relay terminal disconnecting from the access network device.

[0083] The third point that needs to be explained is that in the embodiment of the present application, the relay terminal only takes the disconnection state with the access network device as an example. In another embodiment, when the relay terminal needs service transmission, the relay terminal transitions to a CM-connected state, and at this time, can continue data transmission with the core network to which the relay terminal belongs.

[0084] In the method provided by the embodiment of the present application, when the access network device determines that all communication terminals connected to the access network device via relay terminals have left the connection state with the access network device, it means that the relay terminals no longer need to be connected to the access network device, and the access network device controls the relay terminals to leave the connection state with the access network device, preventing the relay terminals from still being connected to the access network device and continuing to consume resources, thereby saving the resource consumption of the relay terminals and improving the communication quality of the relay terminals.

[0085] 8 shows a block diagram of a state transition device provided by an exemplary embodiment of the present application, which is applied to an access network device. A relay terminal is connected to the access network device, the relay terminal is connected to at least one communication terminal, and the communication terminal is connected to the access network device through the relay terminal. The state transition device includes a control module 801 and a sending module 802.

[0086] The control module 801 controls at least one communication terminal to disconnect from the access network device.

[0087] The transmitting module 802 transmits a first control message to the relay terminal when it determines that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, and the first control message is used to instruct the relay terminal to leave the connection state with the access network device.

[0088] In some embodiments, the relay terminal leaving the connection state with the access network device includes the relay terminal entering a connection management idle (CM-idle) state and / or a radio resource control idle (RRC-idle) state, and the first control message is a first radio connection release message, and the first radio connection release message is used to instruct the relay terminal to transition to the CM-idle state and / or the RRC-idle state.

[0089] In some embodiments, the sending module 802 is further configured to send a context release message to a core network connected to the relay terminal, where the context release message is used to instruct the core network connected to the relay terminal to release context information of the relay terminal.

[0090] In some embodiments, the relay terminal leaving the connection state with the access network device includes the relay terminal entering a radio resource control inactive state, the first control message is a first radio connection suspend message, and the first radio connection suspend message is used to instruct the relay terminal to transition to the radio resource control inactive state.

[0091] In some embodiments, the control module 801 is configured to send a second radio connection release message to at least one communication terminal, where the second radio connection release message is used to instruct the communication terminal to transition to a CM-idle state.

[0092] In some embodiments, the control module 801 is configured to send a second radio connection suspend message to at least one communication terminal, the second radio connection suspend message being used to instruct the communication terminal to transition to a radio resource control inactive state.

[0093] In some embodiments, as shown in FIG. 9, the device further includes a receiving module 803 and a connection establishing module 804.

[0094] The receiving module 803 is configured to receive a connection establishment request sent by a relay terminal.

[0095] The connection establishment module 804 is configured to establish a wireless connection with the relay terminal.

[0096] 10 shows a block diagram of a state transition device provided by an exemplary embodiment of the present application, which is applied to a relay terminal. The relay terminal is connected to an access network device, and the relay terminal is connected to at least one communication terminal, and the communication terminal is connected to the access network device through the relay terminal. The state transition device includes a receiving module 1001 and a leaving module 1002.

[0097] The receiving module 1001 is configured to receive a first control message transmitted by the access network device, and the first control message is transmitted by the access network device when it is determined that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device.

[0098] The disassociation module 1002 is configured to disassociate from the access network device based on the first control message.

[0099] In some embodiments, leaving the connection state with the access network device includes entering a CM-idle state and / or an RRC-idle state, and the first control message is a first radio connection release message, and the first radio connection release message is used to instruct the relay terminal to transition to the CM-idle state and / or the RRC-idle state.

[0100] In some embodiments, leaving the connection state with the access network device includes entering a radio resource control inactive state, the first control message is a first radio connection suspend message, and the first radio connection suspend message is used to instruct the relay terminal to transition to the radio resource control inactive state.

[0101] In some embodiments, referring to FIG. 11, the state transition device further comprises a sending module 1003 and a connection establishment module 1004 .

[0102] The sending module 1003 is configured to send a connection establishment request to an access network device via a wireless connection with the communication terminal.

[0103] The connection establishment module 1004 is configured to establish a wireless connection with an access network device.

[0104] 12 shows a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application. The communication device includes: a processor 1201, a receiver 1202, a transmitter 1203, a memory 1204, and a bus 1205.

[0105] The processor 1201 includes one or more processing cores, and the processor 1201 executes various functional applications and information processing by executing software programs and modules.

[0106] The receiver 1202 and the transmitter 1203 may be implemented as one communication component, which may be a communication chip.

[0107] The memory 1204 is connected to the processor 1201 via a bus 1205 .

[0108] The memory 1204 may be configured to store at least one instruction, and the processor 1201 may be configured to execute the at least one instruction to implement each step in the above method embodiments.

[0109] The communication device is an access network device or a relay terminal.

[0110] It should be noted that memory 1204 can be implemented by any type of volatile or non-volatile storage device or combination thereof, including, but not limited to, magnetic or optical disks, electrically erasable and programmable read-only memory (EEPROM), erasable and programmable read-only memory (EPROM), static random access memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, and programmable read-only memory (PROM).

[0111] In an exemplary embodiment, a computer-readable storage medium having executable program code stored thereon is also provided, the executable program code being loaded and executed by the processor to implement the state transition method performed by a communication device provided by each of the method embodiments described above.

[0112] In an exemplary embodiment, a chip is also provided, the chip including programmable logic circuits and / or program instructions, which when executed on an access network device or a relay terminal, implements the above-described state transition method.

[0113] In an exemplary embodiment, a computer program product is also provided, which, when executed by a processor of an access network device or a relay terminal, implements the above-mentioned state transition method.

[0114] Those skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk, an optical disk, etc.

[0115] The above description is only an optional example of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A state transition method applied to an access network device, wherein a relay terminal is connected to the access network device, and the relay terminal is connected to at least one communication terminal, and the communication terminal is connected to the access network device via the relay terminal, and the state transition method includes: controlling the at least one communication terminal to disconnect from the access network device; and when it is determined that all communication terminals connected to the access network device via the relay terminal have left the connection state with the access network device, transmitting a first control message to the relay terminal, wherein the first control message is used to instruct the relay terminal to leave the connection state with the access network device; The step of controlling the at least one communication terminal to leave a connection state with the access network device comprises: sending a second radio connection release message to the at least one communication terminal to instruct the communication terminal to transition to a connection management idle (CM-idle) state; or transmitting a second radio connection suspend message to the at least one communication terminal for instructing the communication terminal to transition to a radio resource control inactive state. A state transition method comprising:

2. The relay terminal leaving the connection state with the access network device includes the relay terminal entering a connection management idle (CM-idle) state and / or a radio resource control idle (RRC-idle) state, and the first control message is a first radio connection release message, which is used to instruct the relay terminal to transition to the CM-idle state and / or the RRC-idle state.

2. The state transition method according to claim 1.

3. The method further includes a step of transmitting a context release message to a core network to which the relay terminal is connected, wherein the context release message is used to instruct the core network to which the relay terminal is connected to release context information of the relay terminal.

3. The state transition method according to claim 2.

4. The relay terminal leaving the connection state with the access network device includes the relay terminal entering the radio resource control inactive state, and the first control message is a first radio connection suspend message, and the first radio connection suspend message is used to instruct the relay terminal to transition to the radio resource control inactive state.

2. The state transition method according to claim 1.

5. receiving a connection establishment request sent by the relay terminal; and further comprising the step of establishing a wireless connection with the relay terminal.

2. The state transition method according to claim 1.

6. A state transition method applied to a relay terminal, the relay terminal being connected to an access network device, and the relay terminal being connected to at least one communication terminal, and the communication terminal being connected to the access network device via the relay terminal, the state transition method comprising: receiving a first control message sent by the access network device; and disconnecting from the access network device based on the first control message; When the access network device determines that all communication terminals connected to the access network device via the relay terminal have left a connection state with the access network device, the first control message is sent by the access network device; The at least one communication terminal's leaving the connection state with the access network device is controlled by the access network device transmitting, to the at least one communication terminal, a second radio connection release message for instructing the communication terminal to transition to a CM-idle state, or transmitting, to the at least one communication terminal, a second radio connection suspend message for instructing the communication terminal to transition to a radio resource control inactive state. A state transition method comprising:

7. Leaving the connection state with the access network device includes entering a CM-idle state and / or an RRC-idle state, and the first control message is a first radio connection release message, which is used to instruct the relay terminal to transition to the CM-idle state and / or the RRC-idle state.

7. The state transition method according to claim 6.

8. Leaving the connection state with the access network device includes entering a radio resource control inactive state, and the first control message is a first radio connection suspend message, and the first radio connection suspend message is used to instruct the relay terminal to transition to the radio resource control inactive state.

7. The state transition method according to claim 6.

9. sending a connection establishment request to the access network device via a wireless connection with the communications terminal; and establishing a wireless connection with the access network device.

7. The state transition method according to claim 6.

10. a processor; a transceiver connected to the processor; a memory for storing executable program code of said processor; The processor is configured to load and execute the executable program code to implement the state transition method according to any one of claims 1 to 5.

1. An access network device comprising:

11. a processor; a transceiver connected to the processor; a memory for storing executable program code of said processor; The processor is configured to load and execute the executable program code to implement the state transition method according to any one of claims 6 to 9. A relay terminal characterized by:

12. Executable program code is stored, and the executable program code is loaded and executed by a processor to realize the state transition method according to any one of claims 1 to 9. A computer-readable storage medium comprising:

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