RRC connection control method, apparatus, and communication device

Abstract

To disclose an RRC connection control method, an apparatus, and a communication device, which belong to the field of communication technology.SOLUTION: A method of the present application includes a step of a relay terminal performing a first operation when a first condition is satisfied. The first operation includes at least one of triggering an RRC re-establishment process or an RRC connection establishment process via a first interface, and sending connection abnormality indication information to a remote terminal via a second interface or stopping broadcasting of a discovery signal. The first condition includes a connection failure of a first interface link, a connection recovery failure of the first interface link, or an abnormal transition to an RRC idle state. The first interface is a connection interface between the relay terminal and a network side device, and the second interface is a connection interface between the relay terminal and the remote terminal.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of Chinese Patent Application No. 202110247325.X, filed in China on March 5, 2021, and all of its contents are incorporated herein by reference.

[0002] The present invention relates to the field of communication technologies, and in particular, to an RRC connection control method, apparatus, and communication device.

Background Art

[0003] In a scenario where a Remote User Equipment (Remote UE) establishes a Radio Resource Control (RRC) connection with a base station via a Relay User Equipment (Relay UE), the RRC connection of the Remote UE is affected by two links, namely, a PC5 interface connection link and a Uu interface connection link. When a connection failure occurs in the RRC connection of the Remote UE on either of the above two links, it is difficult to quickly recover the RRC connection of the Remote UE.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Embodiments of the present application provide an RRC connection control method, apparatus, and communication device that can solve the problem that it is difficult to quickly recover when the connection of the RRC link of the Remote UE fails.

Means for Solving the Problems

[0005] In a first aspect, When a first condition is satisfied, the relay terminal includes a step of performing a first operation, and the first operation is Triggering a Radio Resource Control (RRC) re - establishment process or an RRC connection establishment process via a first interface; Including at least one of: transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal; The first condition includes a connection failure of a first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state; The first interface is a connection interface between the relay terminal and the network - side device; The second interface is a connection interface between the relay terminal and the terminal, and provides an RRC connection control method.

[0006] In a second aspect, Including the step of determining a second operation to be performed by a remote terminal based on a first operation of a relay terminal; The first operation is Triggering a Radio Resource Control (RRC) re - establishment process or an RRC connection establishment process via a first interface; Including at least one of: transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal; The first interface is a connection interface between the relay terminal and the network - side device; The second interface is a connection interface between the relay terminal and the remote terminal, and provides an RRC connection control method.

[0007] In a third aspect, When a second condition is satisfied, the remote terminal Performs one of: triggering an RRC re - establishment process, an RRC connection recovery process, or an RRC connection establishment process via a direct link; And performing an operation of transitioning to the RRC idle state. The second condition includes that the second interface link has failed or the measurement result of the discovery signal is lower than a preset threshold value. The second interface is a connection interface between the relay terminal and the remote terminal, and provides an RRC connection control method.

[0008] In a fourth aspect, When the first condition is satisfied, it includes a first processing module for executing a first operation, and the first operation is triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface; sending connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, including at least one of them. The first condition includes a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state. The first interface is a connection interface between the relay terminal and the network-side device. The second interface is a connection interface between the relay terminal and the remote terminal, and provides an RRC connection control device.

[0009] In a fifth aspect, It includes a first determination module for determining a second operation to be executed by a remote terminal based on the first operation of the relay terminal. The first operation is triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface; sending connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, including at least one of them. The first interface is a connection interface between the relay terminal and the network-side device. The RRC connection control device provides the second interface, which is a connection interface between the relay terminal and the remote terminal.

[0010] In a sixth aspect, when a second condition is satisfied, an operation of triggering an RRC re - establishment process or an RRC connection recovery process or an RRC connection establishment process via a direct link, and an operation of transitioning to the RRC idle state, and includes a fourth processing module for executing one of them. The second condition includes that the second interface link has failed or the measurement result of the discovery signal is lower than a preset threshold. The RRC connection control device provides the second interface, which is a connection interface between the relay terminal and the remote terminal.

[0011] In a seventh aspect, a communication device is provided, which includes a processor, a memory, and a program or command stored in the memory and executable by the processor. When the program or command is executed by the processor, the steps of the method described in the first aspect are realized, or the steps of the method described in the second aspect are realized, or the steps of the method described in the third aspect are realized.

[0012] In an eighth aspect, a readable storage medium is provided, in which a program or command is stored. When the program or command is executed by a processor, the steps of the method described in the first aspect are realized, or the steps of the method described in the second aspect are realized, or the steps of the method described in the third aspect are realized.

[0013] On the ninth side, a chip is provided, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor executes a program or a command to implement the steps of the method described in the first side, or to implement the steps of the method described in the second side, or to implement the steps of the method described in the third side.

[0014] On the tenth side, a computer program product is provided, which is stored in a non-transitory storage medium and, when executed by at least one processor, implements the steps of the method described in the first side, or implements the steps of the method described in the second side, or implements the steps of the method described in the third side.

[0015] On the eleventh side, a communication device is provided, which is arranged to execute the steps of the method described in the first side, or to execute the steps of the method described in the second side, or to execute the steps of the method described in the third side.

Advantages of the Invention

[0016] In an embodiment of the present application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormality indication information to the remote terminal via the second interface or stops the broadcast of the discovery signal. As a result, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of the relay communication.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 9

Embodiments for Carrying out the Invention

[0018] Hereinafter, while referring to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described. Naturally, the described embodiments are only a part of the embodiments of the present application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application shall fall within the protection scope of the present application.

[0019] In the description and claims of this application, terms such as "first", "second", etc. are not for describing a specific order or sequence, but for distinguishing similar objects. It should be understood that such terms may be replaced with each other in appropriate cases so that the embodiments of this application can be implemented in an order other than that illustrated or described herein. Also, the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited. For example, the first object may be one or a plurality. In addition, "and / or" in the description and claims means at least one of the connected objects, and the symbol " / " generally means that the related objects before and after are in an "or" relationship.

[0020] It should be noted that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system. Furthermore, for example, it is applicable to other wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single-Carrier Frequency-Division Multiple Access (SC-FDMA), as well as other systems. The terms "system" and "network" in the embodiments of the present application can often be used interchangeably. The described technology can be used in the systems and radio technologies mentioned above, and can also be used in other systems and radio technologies. However, for the purpose of illustration in the following description, the New Radio (NR) system will be described, and the NR term is used in many of the following descriptions. These technologies are applicable not only to the NR system but also to, for example, the 6th Generation (6G) communication system. th Generation, 6G) communication system.

[0021] To help those skilled in the art better understand the embodiments of the present invention, the Sidelink Relay will be described first.

[0022] The relay technology in a wireless communication system is to add one or more relay nodes between the base station and the terminal to forward the wireless signal once or multiple times. That is, the wireless signal needs to pass through multiple hops to reach the terminal.

[0023] Wireless relay technology can not only be used to extend cell coverage and compensate for coverage dead spots, but also improve cell capacity through the reuse of spatial resources. In the case of indoor coverage, Relay technology can also play a role in overcoming transmission loss and improving the quality of indoor coverage.

[0024] Taking simple two-hop relay as an example, wireless relay divides the link from the base station to the terminal into two links, from the base station to the relay station and from the relay station to the terminal, replacing one poor-quality link with two high-quality links and providing an opportunity to obtain higher link capacity and better coverage.

[0025] As shown in FIG. 1, one end of the relay terminal 13 is connected to the remote terminal 11, and the other end is connected to the network-side device 12. Here, the remote terminal 11 may also be referred to as a terminal device or a user terminal (User Equipment, UE). The remote terminal may be a mobile phone, a tablet computer, a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a palmtop computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), a wearable device, or a vehicle user equipment (VUE), a pedestrian user equipment (PUE), etc. The wearable device may include a wristband, headphones, glasses, etc. It should be noted that the specific type of the remote terminal 11 is not limited in the embodiments of the present application. The network-side device 12 may be a base station or a core network device. The base station may be called a Node B, an evolved Node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a B node, an evolved B node (eNB), a home Node B, a home evolved B node, a wireless local area network (WLAN) access point, a wireless fidelity (WiFi) node, a transmitting and receiving point (TRP), or any other suitable term in the art. As long as the same technical effect can be achieved, the base station is not limited to a specific technical term.It should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

[0026] In the following, with reference to the drawings, the RRC connection control method provided in the embodiments of the present application will be described in more detail by specific embodiments and their application scenarios.

[0027] As shown in FIG. 2, the RRC connection control method according to the embodiment of the present application includes step 201 in which when a first condition is satisfied, the relay terminal performs a first operation, and the first operation includes triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface, and transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, including at least one of them, wherein the first condition includes a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the first interface is a connection interface between the relay terminal and a network-side device, and the second interface is a connection interface between the relay terminal and the remote terminal.

[0028] Optionally, in the embodiments of the present application, the first interface is a cellular network communication interface (Uu interface), and the second interface is a direct communication interface (PC5 interface).

[0029] Here, the condition for the abnormal transition to the RRC idle state is the conventional condition. For example, a security problem of the non-access stratum network attached storage (NAS) occurs, etc. Details are omitted here.

[0030] In the RRC connection control method of the embodiment of the present application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormal indication information to the remote terminal via the second interface or stops the broadcast of the discovery signal. Thereby, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of the relay communication.

[0031] As a first alternative implementation form, when the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, the method After the RRC re-establishment is successful or the RRC connection establishment is successful, the relay terminal further includes the step of receiving an RRC reconfiguration message or an RRC connection recovery message of the remote terminal transmitted from the network-side device. Here, the RRC reconfiguration message includes an incremental configuration or a complete configuration. The RRC connection recovery message includes an incremental configuration or a complete configuration.

[0032] Specifically, when the remote terminal is in the RRC connected state, the relay terminal receives an RRC reconfiguration message transmitted from the network-side device. When the remote terminal is in the RRC inactive state, the relay terminal receives an RRC connection recovery message transmitted from the network-side device.

[0033] In this implementation form, the initial RRC state of the relay terminal is the connected state, and the initial RRC state of the remote terminal is the connected state or the inactive state.

[0034] Optionally, the method of the embodiment of the present application The relay terminal further includes the step of transferring the RRC reconfiguration message or the RRC connection recovery message to the remote terminal.

[0035] Optionally, the method of the embodiments of the present application The relay terminal further includes the step of transferring the RRC reconfiguration completion message or the RRC connection recovery completion message transmitted from the remote terminal to the network-side device, Specifically, when transmitting an RRC reconfiguration message to the remote terminal, the remote terminal transmits an RRC reconfiguration completion message to the relay terminal, and when transmitting an RRC connection recovery message to the remote terminal, the remote terminal transmits an RRC connection recovery completion message to the relay terminal.

[0036] As a second alternative implementation form, when the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via a first interface, and transmitting connection anomaly indication information to the remote terminal via a second interface or stopping the broadcast of a discovery signal, the method The relay terminal further includes the step of assisting the remote terminal in triggering an RRC re-establishment process, an RRC connection establishment process, or an RRC connection recovery process after the RRC re-establishment is successful or the RRC connection establishment is successful.

[0037] In this implementation form, the initial RRC state of the relay terminal is the connected state, and the initial RRC state of the remote terminal is the connected state or the inactive state.

[0038] In the RRC connection control method of the embodiment of the present application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormality indication information to the remote terminal via the second interface or stops the broadcast of the discovery signal. Thereby, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of the relay communication.

[0039] As shown in FIG. 3, the embodiment of the present application further provides an RRC connection control method, and the RRC connection control method includes step 301 of determining a second operation executed by the remote terminal based on a first operation of the relay terminal, wherein the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and transmitting connection abnormality indication information to the remote terminal via the second interface or stopping the broadcast of the discovery signal, at least one of which is included, wherein the first interface is a connection interface between the relay terminal and the network-side device, and the second interface is a connection interface between the relay terminal and the remote terminal.

[0040] Optionally, in the embodiment of the present application, the first interface is a Uu interface, and the second interface is a PC5 interface.

[0041] The first operation is an operation executed by the relay terminal when a first condition is satisfied, and the first condition includes a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state.

[0042] In the RRC connection control method of the embodiment of the present application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormality indication information to the remote terminal via the second interface or stops the broadcast of the discovery signal. The remote terminal executes a corresponding second operation based on the first operation of the relay terminal. Thereby, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of relay communication.

[0043] As a first alternative implementation form, when the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, the second operation includes obtaining an RRC reconfiguration message or an RRC connection recovery message transferred from the relay terminal, wherein the RRC reconfiguration message includes an incremental configuration or a complete configuration, and the RRC connection recovery message includes an incremental configuration or a complete configuration.

[0044] Specifically, when the remote terminal is in the RRC connected state, it obtains an RRC reconfiguration message transferred from the relay terminal, and when the remote terminal is in the RRC inactive state, it obtains an RRC connection recovery message transferred from the relay terminal.

[0045] In this implementation form, the initial RRC state of the relay terminal is the connected state, and the initial RRC state of the remote terminal is the connected state or the inactive state.

[0046] Optionally, the method of the embodiment of the present application further includes the step of transmitting an RRC reconfiguration completion message or an RRC connection recovery completion message to the relay terminal.

[0047] As a second alternative implementation form, when the first operation includes transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation includes triggering a relay reselection process based on the connection anomaly indication information, and triggering a relay reselection process based on discovery signal measurement, and transitioning to the RRC idle state, including at least one of them.

[0048] Optionally, the method of the embodiment of the present application further includes, after the remote terminal triggers a relay reselection process, triggering an RRC connection establishment process or an RRC reestablishment process or an RRC connection recovery process by the reselected relay terminal.

[0049] In this implementation form, the initial RRC state of the relay terminal is the connected state, and the initial RRC state of the remote terminal is the connected state or the inactive state.

[0050] As a third alternative implementation form, when the first operation includes triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface, and transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation includes after the RRC reestablishment of the relay terminal is successful or the RRC connection establishment is successful, triggering an RRC connection establishment process or an RRC reestablishment process or an RRC connection recovery process by the relay terminal.

[0051] In this implementation form, the initial RRC state of the relay terminal is the connected state, and the initial RRC state of the remote terminal is the connected state or the inactive state.

[0052] Hereinafter, the present application will be described in detail by way of examples.

[0053] Example 1: Both the Remote UE and the Relay UE are in the RRC Connected state.

[0054] When the Relay UE determines that a Uu link failure (i.e., a connection failure of the first interface link) has occurred, it performs at least one of the following operations.

[0055] Operation 1: Via the PC5 interface, the Relay UE either sends connection abnormality indication information to the Remote UE or stops transmitting Discovery signals.

[0056] 1) When the indication information is sent, after the Remote UE receives the indication information, the Remote UE triggers an RRC re-establishment process, or the Remote UE triggers a relay reselection process, or the Remote UE releases the Uu RRC connection and transitions to the RRC Idle state.

[0057] 2) When the transmission of the Discovery signal is stopped, if it is determined by Remote UE measurement that the Relay UE does not meet the suitable relay conditions, a relay reselection process is triggered.

[0058] Operation 2: Via the Uu interface, the Relay UE triggers an RRC re-establishment process.

[0059] After the re-establishment of the Relay UE is successful, the base station performs a delta config operation on the Remote UE via the Relay UE, that is, the Remote UE does not need to trigger RRC re-establishment and only needs to passively receive the RRC reconfiguration message from the base station relayed by the Relay UE.

[0060] Example 2: Both the Remote UE and the Relay UE are in the RRC Connected state.

[0061] When the Relay UE determines that a Uu link recovery failure (i.e., a connection recovery failure of the first interface link) or an abnormal transition to the RRC Idle state has occurred, it performs at least one of the following operations.

[0062] Operation 1: Via the PC5 interface, the Relay UE either sends connection abnormality indication information to the Remote UE or stops transmitting the Discovery signal.

[0063] 1) When the indication information is sent, after the Remote UE receives the indication information, the Remote UE triggers the RRC connection establishment process, or the Remote UE triggers the relay reselection process, or the Remote UE releases the Uu RRC connection and transitions to the RRC Idle state.

[0064] 2) When the transmission of the Discovery signal is stopped, if it is determined by Remote UE measurement that the Relay UE does not meet the suitable relay conditions, the relay reselection process is triggered.

[0065] Operation 2: Via the Uu interface, the Relay UE triggers the RRC connection establishment process.

[0066] After the connection establishment of the Relay UE is successful, the base station performs a full config operation on the Remote UE via the Relay UE, that is, the Remote UE does not need to trigger the RRC connection establishment and only needs to passively receive the RRC reconfiguration message from the base station relayed by the Relay UE.

[0067] In the RRC connection control method according to the embodiment of the present application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) reestablishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormality indication information to the remote terminal via the second interface or stops the broadcast of the discovery signal. The remote terminal performs a corresponding second operation based on the first operation of the relay terminal. Thereby, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of relay communication.

[0068] As shown in FIG. 4, the embodiment of the present application further provides an RRC connection control method, and the RRC connection control method includes: When the second condition is satisfied, the remote terminal performs operation 1 of triggering an RRC reestablishment process, an RRC connection recovery process, or an RRC connection establishment process via the direct link, and operation 2 of transitioning to the RRC idle state, including step 401 of performing one of them. Here, the second condition includes that the second interface link is faulty or the measurement result of the discovery signal is lower than a preset threshold. The second interface is a connection interface between the relay terminal and the remote terminal.

[0069] Optionally, in the embodiment of the present application, the first interface is a Uu interface, and the second interface is a PC5 interface.

[0070] In the embodiments of the present application, when it is determined that the connection of the PC5 link fails or the measurement result of the discovery signal is lower than a preset threshold, the remote terminal triggers an RRC reestablishment process, an RRC connection recovery process, or an RRC connection establishment process via a direct link, and / or releases the Uu RRC connection to enter the RRC idle state, ensuring that the remote terminal can quickly recover the RRC connection.

[0071] It should be noted that the execution entity of the RRC connection control method provided in the embodiments of the present application may be an RRC connection control device, or a control module for executing the RRC connection control method within the RRC connection control device. In the embodiments of the present application, taking the RRC connection control device executing the RRC connection control method as an example, the RRC connection control device provided in the embodiments of the present application will be described.

[0072] As shown in FIG. 5, the embodiments of the present application provide an RRC connection control device 500 applied to a relay terminal. The RRC connection control device 500 includes: a first processing module 501 for executing a first operation when a first condition is satisfied, and the first operation includes: triggering an RRC reestablishment process or an RRC connection establishment process via a first interface; and sending connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, including at least one of them; the first condition includes a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state; the first interface is a connection interface between the relay terminal and a network-side device; the second interface is a connection interface between the relay terminal and the remote terminal.

[0073] Optionally, the device of the embodiments of the present application It further includes a second determination module for determining the first condition.

[0074] Optionally, when the first operation includes triggering a Radio Resource Control (RRC) re - establishment process or an RRC connection establishment process via a first interface, it further includes a first receiving module for receiving an RRC re - configuration message or an RRC connection recovery message of a remote terminal transmitted from a network - side device after the RRC re - establishment is successful or after the RRC connection establishment is successful. Here, the RRC re - configuration message includes an incremental configuration or a complete configuration. The RRC connection recovery message includes an incremental configuration or a complete configuration.

[0075] Optionally, the apparatus of the embodiment of the present application further includes a first transfer module for transferring the RRC re - configuration message or the RRC connection recovery message to the remote terminal.

[0076] Optionally, the apparatus of the embodiment of the present application further includes a second transfer module for transferring an RRC re - configuration completion message or an RRC connection recovery completion message transmitted from the remote terminal to the network - side device.

[0077] Optionally, when the first operation includes triggering a Radio Resource Control (RRC) re - establishment process or an RRC connection establishment process via a first interface, and transmitting connection anomaly indication information to the remote terminal or stopping the broadcast of a discovery signal via a second interface, it further includes a second processing module for assisting the remote terminal to trigger an RRC re - establishment process or an RRC connection establishment process or an RRC connection recovery process after the RRC re - establishment is successful or after the RRC connection establishment is successful.

[0078] The RRC connection control device provided in the embodiments of this application can implement each process realized in the method embodiment of FIG. 2, and can achieve similar technical effects. To avoid repetition, detailed descriptions are omitted here.

[0079] In the embodiments of this application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormality indication information to the remote terminal via the second interface or stops the broadcast of the discovery signal. As a result, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of relay communication.

[0080] As shown in FIG. 6, the embodiments of this application further provide an RRC connection control device 600 applied to a remote terminal. The RRC connection control device 600 includes a first determination module 601 for determining a second operation executed by the remote terminal based on a first operation of the relay terminal. The first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and transmitting connection abnormality indication information to the remote terminal via the second interface or stopping the broadcast of the discovery signal, including at least one of them. The first interface is a connection interface between the relay terminal and the network-side device. The second interface is a connection interface between the relay terminal and the remote terminal.

[0081] Optionally, the device in the embodiments of this application further includes a third determination module for determining the first operation of the relay terminal.

[0082] Optionally, when the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via a first interface, the second operation includes obtaining an RRC reconfiguration message or an RRC connection resume message transferred from a relay terminal, wherein the RRC reconfiguration message includes an incremental configuration or a complete configuration, and the RRC connection resume message includes an incremental configuration or a complete configuration.

[0083] Optionally, the apparatus according to an embodiment of the present application further includes a first transmission module for transmitting an RRC reconfiguration completion message or an RRC connection resume completion message to the relay terminal.

[0084] Optionally, when the first operation includes transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation includes triggering a relay reselection process based on the connection abnormality indication information, triggering a relay reselection process based on discovery signal measurement, and / or migrating to the RRC idle state.

[0085] Optionally, the apparatus according to an embodiment of the present application further includes a third processing module for triggering an RRC connection establishment process, an RRC re-establishment process, or an RRC connection resume process by a reselected relay terminal after the remote terminal triggers a relay reselection process.

[0086] Optionally, the first operation includes triggering a radio resource control (RRC) re - establishment process or an RRC connection establishment process via a first interface, and when transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation is as follows: After the RRC re - establishment of the relay terminal is successful or the RRC connection establishment is successful, it includes triggering an RRC connection establishment process, an RRC re - establishment process, or an RRC connection recovery process by the relay terminal.

[0087] In the apparatus according to the embodiment of the present application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) re - establishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormality indication information to the remote terminal via the second interface or stops the broadcast of a discovery signal. The remote terminal executes a corresponding second operation based on the first operation of the relay terminal. Thus, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of relay communication.

[0088] The RRC connection control apparatus provided in the embodiment of the present application can implement each process realized in the method embodiment of FIG. 3 and achieve the same technical effects. To avoid repetition, detailed description is omitted here.

[0089] As shown in FIG. 7, the embodiment of the present application provides an RRC connection control apparatus 700 applied to a remote terminal. The RRC connection control apparatus 700 is as follows: When the second condition is satisfied, An operation of triggering an RRC re - establishment process, an RRC connection recovery process, or an RRC connection establishment process via a direct link, and A fourth processing module 701 for performing one of the operations of transitioning to the RRC idle state Here, the second condition includes that the second interface link has failed or the measurement result of the discovery signal is lower than a preset threshold value. The second interface is a connection interface between the relay terminal and the remote terminal.

[0090] Optionally, the apparatus according to an embodiment of the present application Further includes a fourth determination module for determining whether the second condition is satisfied.

[0091] In the apparatus according to an embodiment of the present application, when the remote terminal determines that the connection of the PC5 link has failed or the measurement result of the discovery signal is lower than a preset threshold value, it triggers an RRC reestablishment process or an RRC connection recovery process or an RRC connection establishment process via the direct link, and / or releases the Uu RRC connection to enter the RRC idle state, ensuring that the remote terminal can quickly recover the RRC connection.

[0092] The RRC connection control apparatus provided in the embodiment of the present application can implement each process realized in the method embodiment of FIG. 4, and can achieve the same technical effects. To avoid repetition, detailed descriptions are omitted here.

[0093] The RRC connection control apparatus in the embodiment of the present application may be an apparatus, or may be a component, an integrated circuit, or a chip in a terminal. The apparatus may be a portable terminal or a non-portable terminal. By way of example, the portable terminal may include the types of the remote terminal 11 listed above, but is not limited thereto. The non-portable terminal may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a cash dispenser, or a kiosk, etc., and is not specifically limited in the embodiment of the present application.

[0094] The RRC connection control device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android (registered trademark) operating system, an IOS operating system, or other possible operating systems, and is not specifically limited in the embodiment of the present application.

[0095] Optionally, as shown in FIG. 8, the embodiment of the present application further provides a communication device 800. The communication device 800 includes a processor 801, a memory 802, and a program or command stored in the memory 802 and executable by the processor 801. For example, when the communication device 800 is a relay terminal, when the program or command is executed by the processor 801, each process of the RRC connection control method embodiment on the relay terminal side is realized; when the communication device 800 is a remote terminal, when the program or command is executed by the processor 801, each process of the RRC connection control method embodiment on the remote terminal side is realized, and the same technical effects can be achieved. To avoid repetition, detailed description is omitted here.

[0096] FIG. 9 is a schematic diagram of the hardware structure of a communication device for realizing the embodiment of the present application, and the communication device is a relay terminal or a remote terminal. The communication device 900 includes components such as a high-frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, and a processor 910, but is not limited thereto.

[0097] A person skilled in the art will understand that the communication device 900 may further include a power source (such as a battery) for supplying power to each component. The power source is logically connected to the processor 910 by a power management system, and it is understandable that the power management system can further realize functions such as charge and discharge management and power consumption management. The structure of the communication device shown in FIG. 9 does not limit a relay terminal or a remote terminal (hereinafter collectively referred to as a terminal). The terminal may include more or fewer components than shown in the figure, or a combination of some components, or different component arrangements, and detailed descriptions are omitted here.

[0098] In the embodiments of the present application, it should be understood that the input unit 904 may include a graphics processing unit (GPU) 9041 that processes still image or video image data acquired by an image capture device (such as a camera) in a video capture mode or an image capture mode, and a microphone 9042. The display unit 906 may include a display panel 9061, and the display panel 9061 can be arranged in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. The other input devices 9072 may include a physical keyboard, function buttons (such as volume control buttons, switch buttons, etc.), a trackball, a mouse, an operation lever, etc., but are not limited thereto, and detailed descriptions are omitted here.

[0099] In the embodiments of the present application, after receiving downlink data from a network-side device, the high-frequency unit 901 processes it with the processor 910 and also transmits uplink data to the network-side device. Usually, the high-frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0100] Memory 909 can be used to store software programs or commands and various data. Memory 909 may mainly include a program or command storage area that can store an operating system, applications or commands required for at least one function (for example, audio playback function, image playback function, etc.), and a data storage area. Further, Memory 909 may include a high-speed random access memory and may further include a non-volatile memory. Here, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. For example, it may be at least one disk storage device, a flash memory, or other non-volatile solid-state storage devices.

[0101] Processor 910 may include one or more processing units. Optionally, the Processor 910 can integrate an application processor that mainly processes an operating system, a user interface, applications or commands, etc., and a modem processor such as a baseband processor that mainly processes wireless communication. It can be understood that the above modem processor may not be integrated into the Processor 910.

[0102] When the communication device is a relay terminal, if the first condition is satisfied, the Processor 910 is used for the relay terminal to execute a first operation, and the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via a first interface; transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, including at least one of them; The first condition includes a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state. The first interface is a connection interface between the relay terminal and the network-side device. The second interface is a connection interface between the relay terminal and the remote terminal.

[0103] Optionally, when the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, the method after successful RRC re-establishment or successful RRC connection establishment, the relay terminal further includes the step of receiving an RRC reconfiguration message or an RRC connection recovery message of the remote terminal transmitted from the network-side device. Here, the RRC reconfiguration message includes an incremental configuration or a complete configuration. The RRC connection recovery message includes an incremental configuration or a complete configuration.

[0104] Optionally, the processor 910 further is used to transfer the RRC reconfiguration message or the RRC connection recovery message to the remote terminal.

[0105] Optionally, the processor 910 further is used to transfer an RRC reconfiguration completion message or an RRC connection recovery completion message transmitted from the remote terminal to the network-side device.

[0106] Optionally, when the first operation includes triggering an RRC re-establishment process or an RRC connection establishment process via the first interface, and transmitting connection anomaly indication information to the remote terminal or stopping the broadcast of the discovery signal via the second interface, the processor 910 further It is used to assist a remote terminal in triggering an RRC re - establishment process, an RRC connection establishment process, or an RRC connection recovery process after the RRC re - establishment of the relay terminal is successful or after the RRC connection establishment is successful.

[0107] When the communication device is a remote terminal, the processor 910 is used to determine a second operation executed by the remote terminal based on a first operation of the relay terminal, wherein the first operation includes at least one of triggering an RRC re - establishment process or an RRC connection establishment process via a first interface and sending connection anomaly indication information to the remote terminal via a second interface or stopping the broadcast of a discovery signal, wherein the first interface is a connection interface between the relay terminal and a network - side device, and the second interface is a connection interface between the relay terminal and the remote terminal.

[0108] Optionally, when the first operation includes triggering an RRC re - establishment process or an RRC connection establishment process via a first interface, the second operation includes obtaining an RRC re - configuration message or an RRC connection recovery message transferred from the relay terminal, wherein the RRC re - configuration message includes an incremental configuration or a complete configuration, and the RRC connection recovery message includes an incremental configuration or a complete configuration.

[0109] Optionally, the processor 910 is further used to send an RRC re - configuration completion message or an RRC connection recovery completion message to the relay terminal.

[0110] Optionally, when the first operation includes transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation includes triggering a relay reselection process based on the connection anomaly indication information, triggering a relay reselection process based on discovery signal measurement, and / or migrating to the RRC idle state.

[0111] Optionally, the processor 910 is further configured to be used to trigger an RRC connection establishment process, an RRC reestablishment process, or an RRC connection recovery process by a reselected relay terminal after the relay terminal triggers a relay reselection process.

[0112] Optionally, when the first operation includes triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface and transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation includes triggering an RRC connection establishment process, an RRC reestablishment process, or an RRC connection recovery process by the relay terminal after the RRC reestablishment or the RRC connection establishment of the relay terminal is successful.

[0113] When the communication device is a remote terminal, the processor 910 is further configured to when a second condition is satisfied, the remote terminal performs one of the operations of triggering an RRC reestablishment process, an RRC connection recovery process, or an RRC connection establishment process via a direct link, and migrating to the RRC idle state, wherein the second condition includes that the second interface link fails or the measurement result of the discovery signal is lower than a preset threshold. The second interface is a connection interface between the relay terminal and the remote terminal.

[0114] In the communication device according to the embodiment of the present application, in the case of a connection failure of the first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state, the relay terminal triggers a radio resource control (RRC) re-establishment process or an RRC connection establishment process via the first interface, and / or transmits connection abnormality indication information to the remote terminal via the second interface or stops the broadcast of the discovery signal. The remote terminal performs a corresponding second operation based on the first operation of the relay terminal. Thereby, when a connection failure occurs in either the PC5 interface connection link or the Uu interface connection link, the remote terminal can quickly recover the connection, ensuring the reliability of the relay communication.

[0115] The embodiment of the present application further provides a readable storage medium. The readable storage medium may be non-volatile or volatile. A program or command is stored in the readable storage medium. When the program or command is executed by a processor, each process of the above RRC connection control method embodiment is realized, and the same technical effect can be achieved. To avoid repetition, detailed description is omitted here.

[0116] Here, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes computer-readable storage media such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0117] Embodiments of this application further provide a chip. The chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor executes a program or command and is used to implement each process of the above RRC connection control method embodiment, and similar technical effects can be achieved. To avoid repetition, detailed descriptions are omitted here.

[0118] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-level chip, a system-on-chip, a chip system, a system-on-a-chip, etc.

[0119] Embodiments of this application further provide a computer program product. The computer program product is stored in a non-transitory readable storage medium and, when executed by at least one processor, implements each process of the above RRC connection control method embodiment, and similar technical effects can be achieved. To avoid repetition, detailed descriptions are omitted here.

[0120] It should be noted that in this specification, the terms "including", "consisting of", or any other variation thereof are intended to include non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, the elements limited by the phrase "including one..." do not exclude the further existence of the same other elements in the process, method, article, or apparatus that includes the element. It should also be pointed out that the scope of the methods and apparatuses in the embodiments of this application is not limited to executing functions in the order illustrated or considered, and may also include executing functions substantially simultaneously or in the reverse order according to such functions. For example, the described method may be executed in an order different from that described, and various steps may be added, omitted, or combined. Also, the features described with reference to any example may be combined in other examples.

[0121] From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiments can be realized in the form of a combination of software and the necessary common hardware platform. Of course, it may also be realized by hardware, but in many cases, the former is a more preferred embodiment. Based on such an understanding, the technical solution of this application or the part that contributes to the prior art can be implemented in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of commands for causing a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the embodiments of this application.

[0122] As described above, the embodiments of this application have been described with reference to the drawings. However, this application is not limited to the above specific embodiments. The above specific embodiments are merely exemplary and not restrictive. Based on the inspiration of this application, many forms that those skilled in the art can achieve without departing from the spirit and the scope of protection of the claims of this application all belong to the scope of protection of this application.

Claims

1. When the first condition is satisfied, the relay terminal includes a step of performing a first operation, and the first operation includes: triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via a first interface; transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, including at least one of them; The first condition includes a connection failure of a first interface link, a connection recovery failure of the first interface link, or an abnormal transition to the RRC idle state; The first interface is a connection interface between the relay terminal and a network-side device; The second interface is a connection interface between the relay terminal and a remote terminal, an RRC connection control method.

2. When the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via a first interface, the method includes: After the RRC re-establishment is successful or the RRC connection establishment is successful, the relay terminal further includes a step of receiving an RRC reconfiguration message or an RRC connection recovery message of the remote terminal transmitted from the network-side device; The RRC reconfiguration message includes an incremental configuration or a complete configuration; The RRC connection recovery message includes an incremental configuration or a complete configuration, the method according to claim 1.

3. The method according to claim 2, wherein the relay terminal further includes a step of forwarding the RRC reconfiguration message or the RRC connection recovery message to the remote terminal.

4. The method according to claim 2, wherein the relay terminal further includes a step of forwarding an RRC reconfiguration completion message or an RRC connection recovery completion message transmitted from the remote terminal to the network-side device.

5. When the first operation includes triggering a radio resource control (RRC) re-establishment process or an RRC connection establishment process via a first interface, and transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the method includes: The relay terminal further includes a step of assisting the remote terminal to trigger an RRC re - establishment process or an RRC connection establishment process or an RRC connection recovery process after the RRC re - establishment is successful or after the RRC connection establishment is successful, according to the method of claim 1.

6. including the step of determining a second operation executed by the remote terminal based on the first operation of the relay terminal, wherein the first operation is triggering a radio resource control RRC re - establishment process or an RRC connection establishment process via a first interface, and transmitting connection abnormality indication information to the remote terminal via a second interface or stopping the broadcast of discovery signals, including at least one of these, wherein the first interface is a connection interface between the relay terminal and the network - side device, The RRC connection control method, wherein the second interface is a connection interface between the relay terminal and the remote terminal.

7. When the first operation includes triggering a radio resource control RRC re - establishment process or an RRC connection establishment process via a first interface, the second operation is including obtaining an RRC re - configuration message or an RRC connection recovery message transferred from the relay terminal, wherein the RRC re - configuration message includes an incremental configuration or a complete configuration, The method according to claim 6, wherein the RRC connection recovery message includes an incremental configuration or a complete configuration.

8. The method according to claim 7, further including the step of transmitting an RRC re - configuration completion message or an RRC connection recovery completion message to the relay terminal.

9. When the first operation includes transmitting connection abnormality indication information to the remote terminal via a second interface or stopping the broadcast of discovery signals, the second operation is triggering a relay reselection process based on the connection abnormality indication information, triggering a relay reselection process based on discovery signal measurement, including at least one of migrating to the RRC idle state, according to the method of claim 6.

10. The method according to claim 9, further including the step of triggering an RRC connection establishment process or an RRC re - establishment process or an RRC connection recovery process by the re - selected relay terminal after the remote terminal triggers a relay reselection process.

11. The first operation includes triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface, and when including transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation is as follows: The method according to claim 6, wherein after successful RRC reestablishment or successful RRC connection establishment of the relay terminal, the relay terminal triggers an RRC connection establishment process, an RRC reestablishment process, or an RRC connection recovery process.

12. When a second condition is satisfied, the remote terminal performs one of an operation of triggering an RRC reestablishment process, an RRC connection recovery process, or an RRC connection establishment process via a direct link and an operation of transitioning to the RRC idle state. The second condition includes that a second interface link is faulty or a measurement result of a discovery signal is lower than a preset threshold. The second interface is a connection interface between the relay terminal and the remote terminal, and is an RRC connection control method.

13. When a first condition is satisfied, a first processing module for performing a first operation is provided, and the first operation includes triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface and at least one of transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal. The first condition includes a connection failure of a first interface link, a connection recovery failure of a first interface link, or an abnormal transition to the RRC idle state. The first interface is a connection interface between the relay terminal and a network-side device. The second interface is a connection interface between the relay terminal and the remote terminal, and is an RRC connection control device.

14. When the first operation includes triggering a radio resource control (RRC) reestablishment process or an RRC connection establishment process via a first interface, the device After successful RRC re - establishment or successful RRC connection establishment, it further comprises a first receiving module for receiving an RRC re - configuration message or an RRC connection recovery message of a remote terminal transmitted from a network - side device. The RRC re - configuration message includes an incremental configuration or a complete configuration. The RRC connection recovery message includes an incremental configuration or a complete configuration. The apparatus according to claim 13.

15. The apparatus according to claim 14, further comprising a first transfer module for transferring the RRC re - configuration message or the RRC connection recovery message to a remote terminal.

16. The apparatus according to claim 14, further comprising a second transfer module for transferring an RRC re - configuration completion message or an RRC connection recovery completion message transmitted from a remote terminal to the network - side device.

17. When the first operation includes triggering a radio resource control RRC re - establishment process or an RRC connection establishment process via a first interface, and transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the apparatus After successful RRC re - establishment or successful RRC connection establishment, it further comprises a second processing module for assisting a remote terminal in triggering an RRC re - establishment process or an RRC connection establishment process or an RRC connection recovery process. The apparatus according to claim 13.

18. It comprises a first determination module for determining a second operation to be performed by a remote terminal based on a first operation of a relay terminal. The first operation is Triggering a radio resource control RRC re - establishment process or an RRC connection establishment process via a first interface; At least one of transmitting connection anomaly indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal. The first interface is a connection interface between the relay terminal and a network - side device. The second interface is a connection interface between the relay terminal and a remote terminal. The RRC connection control apparatus.

19. When the first operation includes triggering a radio resource control RRC re - establishment process or an RRC connection establishment process via a first interface, the second operation is Obtaining an RRC reconfiguration message or an RRC connection recovery message transferred from a relay terminal, wherein the RRC reconfiguration message includes an incremental configuration or a full configuration, wherein the RRC connection recovery message includes an incremental configuration or a full configuration, the apparatus according to claim 18. **Claim 20** The apparatus according to claim 19, further comprising a first transmission module for transmitting an RRC reconfiguration completion message or an RRC connection recovery completion message to the relay terminal. **Claim 21** When the first operation includes transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation includes triggering a relay reselection process based on the connection abnormality indication information; triggering a relay reselection process based on discovery signal measurement; and migrating to the RRC idle state, the apparatus according to claim 18. **Claim 22** The apparatus according to claim 21, further comprising a third processing module for triggering an RRC connection establishment process, an RRC re-establishment process, or an RRC connection recovery process by a reselected relay terminal after the remote terminal triggers a relay reselection process. **Claim 23** When the first operation includes triggering a radio resource control RRC re-establishment process or an RRC connection establishment process via a first interface, and transmitting connection abnormality indication information to a remote terminal via a second interface or stopping the broadcast of a discovery signal, the second operation includes triggering an RRC connection establishment process, an RRC re-establishment process, or an RRC connection recovery process by the relay terminal after the RRC re-establishment of the relay terminal is successful or the RRC connection establishment is successful, the apparatus according to claim 18. **Claim 24** When a second condition is satisfied, performing an operation of triggering an RRC re-establishment process, an RRC connection recovery process, or an RRC connection establishment process via a direct link; and an operation of migrating to the RRC idle state, and comprising a fourth processing module for performing one of the operations, wherein the second condition includes that a second interface link is faulty or a measurement result of a discovery signal is lower than a preset threshold value, wherein the second interface is a connection interface between a relay terminal and a remote terminal, the RRC connection control apparatus.

25. A communication device comprising a processor, a memory, and a program or command stored in the memory and executable by the processor, wherein when the program or command is executed by the processor, the steps of the RRC connection control method according to any one of claims 1 to 5 are realized, or the steps of the RRC connection control method according to any one of claims 6 to 11 are realized, or the steps of the RRC connection control method according to claim 12 are realized.

26. A readable storage medium storing a program or command, wherein when the program or command is executed by a processor, the steps of the RRC connection control method according to any one of claims 1 to 5 are realized, or the steps of the RRC connection control method according to any one of claims 6 to 11 are realized, or the steps of the RRC connection control method according to claim 12 are realized.

27. A chip comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor executes a program or command to realize the steps of the RRC connection control method according to any one of claims 1 to 5, or the steps of the RRC connection control method according to any one of claims 6 to 11, or the steps of the RRC connection control method according to claim 12.

28. A computer program product stored in a non-transitory storage medium and realized by being executed by at least one processor, wherein the steps of the RRC connection control method according to any one of claims 1 to 5 are realized, or the steps of the RRC connection control method according to any one of claims 6 to 11 are realized, or the steps of the RRC connection control method according to claim 12 are realized.

29. A communication device arranged to execute the steps of the RRC connection control method according to any one of claims 1 to 5, or to execute the steps of the RRC connection control method according to any one of claims 6 to 11, or to execute the steps of the RRC connection control method according to claim 12.

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