Method and device for restoring terminal RRC connection

Abstract

The present application provides a method and device for recovering a terminal RRC connection, the method comprising: the anchor network device of the terminal sends an indication message to the source relay device of the terminal, and then the source relay device releases the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the indication message. Therefore, the present application provides a solution for recovering an RRC connection for a terminal that enters an RRC inactive state under a non-direct connection, filling the gap in this technical direction. It can also save some resources of the source relay device.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method and device for recovering a terminal radio resource control (RRC) connection. Background Art

[0002] With the development of communication technology, the layout of network equipment (such as base stations) has gradually increased, greatly increasing the coverage area of ​​mobile communication networks. However, it is inevitable that some areas still have blind spots in mobile signal coverage. In order to solve this problem, the UE-to-Network Relay (hereinafter referred to as relay) from the terminal to the network device is currently introduced. The relay can be a device with a relay function. If the terminal enters the coverage range of another terminal, the other terminal can serve as a relay device for the terminal, wherein the relay device and the network device communicate through the Uu interface, and the terminal and the relay device communicate through a direct communication link (also called Sidelink or PC5), so the terminal can communicate with the network device through the relay device, thereby achieving the purpose of expanding the network coverage of the network device. At this time, the connection between the terminal and the network device is an indirect connection.

[0003] Among them, the RRC states of the terminal include the following: idle state, inactive state, and connected state. When the terminal is in the connected state, if there is no data transmission demand, the terminal can return from the connected state to the inactive state so that the connected state can be restored faster later. However, there is currently no relevant solution for how to restore the RRC connection for terminals that enter the RRC inactive state under non-direct connection. Summary of the invention

[0004] The present application provides a method and device for recovering a terminal RRC connection, and provides a solution for recovering an RRC connection for a terminal that enters an RRC inactive state under a non-direct connection, thus filling a gap in this technical direction.

[0005] In a first aspect, the present application provides a method for recovering a terminal RRC connection, comprising:

[0006] The source relay device of the terminal receives instruction information from the anchor network device of the terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0007] The source relay device releases the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the instruction information;

[0008] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0009] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0010] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0011] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0012] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0013] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0014] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0015] The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

[0016] Optionally, the indication information is carried by RRC signaling, media access control MAC control element (Control Element, CE) or physical layer signaling sent by the anchor network device to the source relay device.

[0017] Optionally, the terminal-related configuration information includes one or more of the following:

[0018] A mapping relationship between a direct communication interface Radio Link Control (RLC) channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0019] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0020] Terminal identification information.

[0021] Optionally, the identification information of the terminal includes any one or more of the following:

[0022] The cell radio network temporary identifier C-RNTI allocated by the anchor network device to the terminal;

[0023] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0024] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0025] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0026] PC5-S connection between source relay device and terminal;

[0027] PC5-RRC connection between the source relay device and the terminal.

[0028] In a second aspect, the present application provides a method for recovering a terminal RRC connection, including:

[0029] The anchor network device of the terminal sends instruction information to the source relay device of the terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0030] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0031] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0032] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0033] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0034] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0035] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0036] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0037] The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

[0038] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device to the source relay device.

[0039] Optionally, the terminal-related configuration information includes one or more of the following:

[0040] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0041] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0042] Terminal identification information.

[0043] Optionally, the identification information of the terminal includes any one or more of the following:

[0044] The cell-radio network temporary identifier (C-RNTI) allocated by the anchor network device to the terminal;

[0045] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0046] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0047] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0048] PC5-S connection between source relay device and terminal;

[0049] PC5-RRC connection between the source relay device and the terminal.

[0050] Optionally, before the anchor network device sends the indication information to the source relay device of the terminal, the method further includes:

[0051] The anchor network device receives a terminal context request message sent by the target network device of the terminal;

[0052] The target network device refers to the network device that serves the terminal when the terminal initiates RRC connection recovery.

[0053] Optionally, the method further includes:

[0054] The anchor network device deletes the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally according to the terminal context request message;

[0055] The anchor network device sends the deleted terminal context information to the target network device through the network device interface.

[0056] Optionally, the method further includes:

[0057] The anchor network device sends the terminal context information stored locally to the target network device through the network device interface according to the terminal context request message.

[0058] Optionally, before the anchor network device sends the indication information to the source relay device of the terminal, the method further includes:

[0059] The anchor network device receives the RRC connection recovery request message sent by the terminal.

[0060] Optionally, after the anchor network device receives the RRC connection recovery request message from the terminal, the method further includes:

[0061] The anchor network device deletes the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally;

[0062] The anchor network device sends a response message corresponding to the RRC connection recovery request message to the terminal according to the deleted terminal context information.

[0063] In a third aspect, the present application provides a device for recovering a terminal RRC connection, including a memory, a transceiver, and a processor;

[0064] Memory for storing computer programs;

[0065] a transceiver for transmitting and receiving data under the control of the processor;

[0066] A processor that reads a computer program from memory and performs the following operations:

[0067] Receiving instruction information from an anchor network device of the terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0068] Release the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the instruction information;

[0069] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0070] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0071] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0072] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0073] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0074] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0075] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0076] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0077] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device to the source relay device.

[0078] Optionally, the terminal-related configuration information includes one or more of the following:

[0079] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0080] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0081] Terminal identification information.

[0082] Optionally, the identification information of the terminal includes any one or more of the following:

[0083] The C-RNTI allocated by the anchor network device to the terminal;

[0084] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0085] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0086] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0087] PC5-S connection between source relay device and terminal;

[0088] PC5-RRC connection between the source relay device and the terminal.

[0089] In a fourth aspect, the present application provides a device for recovering a terminal RRC connection, which is applied to an anchor network device, and the device includes a memory, a transceiver, and a processor;

[0090] Memory for storing computer programs;

[0091] a transceiver for transmitting and receiving data under the control of the processor;

[0092] A processor that reads a computer program from memory and performs the following operations:

[0093] Sending instruction information to a source relay device of the terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0094] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0095] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0096] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0097] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0098] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0099] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0100] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0101] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0102] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device to the source relay device.

[0103] Optionally, the terminal-related configuration information includes one or more of the following:

[0104] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0105] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0106] Terminal identification information.

[0107] Optionally, the identification information of the terminal includes any one or more of the following:

[0108] The C-RNTI allocated by the anchor network device to the terminal;

[0109] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0110] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0111] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0112] PC5-S connection between source relay device and terminal;

[0113] PC5-RRC connection between the source relay device and the terminal.

[0114] Optionally, the processor is further configured to perform the following operations:

[0115] Before sending the indication information to the source relay device of the terminal, receiving a terminal context request message sent by the target network device of the terminal;

[0116] The target network device refers to the network device that serves the terminal when the terminal initiates RRC connection recovery.

[0117] Optionally, the processor is further configured to perform the following operations:

[0118] According to the terminal context request message, delete the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally;

[0119] The deleted terminal context information is sent to the target network device through the network device interface.

[0120] Optionally, the processor is further configured to perform the following operations:

[0121] According to the terminal context request message, the terminal context information stored locally is sent to the target network device through the network device interface.

[0122] Optionally, the processor is further configured to perform the following operations:

[0123] Before sending the indication information to the source relay device of the terminal, an RRC connection recovery request message sent by the terminal is received.

[0124] Optionally, the processor is further configured to perform the following operations:

[0125] After receiving the RRC connection recovery request message from the terminal, deleting the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally;

[0126] According to the deleted terminal context information, a response message corresponding to the RRC connection recovery request message is sent to the terminal.

[0127] In a fifth aspect, the present application provides a device for recovering a terminal RRC connection, including:

[0128] A receiving unit, configured to receive instruction information from an anchor network device of a terminal, wherein the instruction information is used to instruct a source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0129] A processing unit, configured to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal according to the indication information;

[0130] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0131] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0132] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0133] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0134] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0135] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0136] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0137] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0138] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device to the source relay device.

[0139] Optionally, the terminal-related configuration information includes one or more of the following:

[0140] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0141] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0142] Terminal identification information.

[0143] Optionally, the identification information of the terminal includes any one or more of the following:

[0144] The C-RNTI allocated by the anchor network device to the terminal;

[0145] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0146] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0147] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0148] PC5-S connection between source relay device and terminal;

[0149] PC5-RRC connection between the source relay device and the terminal.

[0150] In a sixth aspect, the present application provides a device for recovering a terminal RRC connection, including:

[0151] A sending unit, configured to send instruction information to a source relay device of the terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0152] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0153] Optionally, a prerequisite for the sending unit to send the indication information to the source relay device is any one of the following:

[0154] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0155] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0156] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0157] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0158] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0159] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0160] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the sending unit to the source relay device.

[0161] Optionally, the terminal-related configuration information includes one or more of the following:

[0162] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0163] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0164] Terminal identification information.

[0165] Optionally, the identification information of the terminal includes any one or more of the following:

[0166] The C-RNTI allocated by the anchor network device to the terminal;

[0167] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0168] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0169] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0170] PC5-S connection between source relay device and terminal;

[0171] PC5-RRC connection between the source relay device and the terminal.

[0172] Optionally, the device further comprises:

[0173] The receiving unit is configured to receive a terminal context request message sent by a target network device of the terminal before the sending unit sends the indication information to the source relay device of the terminal;

[0174] The target network device refers to the network device that serves the terminal when the terminal initiates RRC connection recovery.

[0175] Optionally, the device further comprises:

[0176] A processing unit, configured to delete configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally according to the terminal context request message;

[0177] The sending unit is also used to send the deleted terminal context information to the target network device through the network device interface.

[0178] Optionally, the sending unit is further configured to send the locally stored terminal context information to the target network device through the network device interface according to the terminal context request message.

[0179] Optionally, the device further comprises:

[0180] The receiving unit is used to receive an RRC connection recovery request message sent by the terminal before the sending unit sends the indication information to the source relay device of the terminal.

[0181] Optionally, the device further comprises:

[0182] a processing unit, configured to delete configuration information related to the source relay device of the terminal under the anchor network device from the locally stored context information of the terminal after the receiving unit receives the RRC connection recovery request message from the terminal;

[0183] The sending unit is further used to send a response message corresponding to the RRC connection recovery request message to the terminal according to the deleted terminal context information.

[0184] In a seventh aspect, the present application provides a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and the computer program is used to enable a processor to execute the method described in the first aspect or the second aspect.

[0185] In an eighth aspect, the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the method as described in any one of the first aspect or the second aspect.

[0186] In a ninth aspect, the present application provides a terminal RRC connection recovery system, comprising an anchor network device as described above and a source relay device as described above.

[0187] The present application provides a method and apparatus for recovering a terminal RRC connection, wherein the anchor network device of the terminal sends an indication message to the source relay device of the terminal, and then the source relay device releases the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the indication message. Therefore, the present application provides a relevant solution for how a terminal in an RRC inactive state requests to recover an RRC connection when the terminal enters an RRC inactive state through a source relay device under an anchor network device. It can also save some resources of the source relay device.

[0188] It should be understood that the contents described in the above summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0189] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0190] Figure 1 A schematic diagram of an application scenario provided for an embodiment of the present application;

[0191] Figure 2 A flowchart of a method for restoring a terminal RRC connection provided in an embodiment of the present application;

[0192] Figure 3 A flowchart of a method for restoring a terminal RRC connection provided by another embodiment of the present application;

[0193] Figure 4 A flowchart of a method for restoring a terminal RRC connection provided by another embodiment of the present application;

[0194] Figure 5 A flowchart of a method for restoring a terminal RRC connection provided by another embodiment of the present application;

[0195] Figure 6 A schematic diagram of the structure of a device for restoring a terminal RRC connection provided in an embodiment of the present application;

[0196] Figure 7 A schematic diagram of the structure of an apparatus for restoring a terminal RRC connection provided in another embodiment of the present application;

[0197] Figure 8 A schematic diagram of the structure of an apparatus for restoring a terminal RRC connection provided in another embodiment of the present application;

[0198] Fig. 9 A schematic diagram of the structure of an apparatus for recovering a terminal RRC connection provided in another embodiment of the present application. DETAILED DESCRIPTION

[0199] The term "and / or" in this application describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0200] In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0201] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0202] The embodiment of the present application provides a method and apparatus for recovering the RRC connection of a terminal, when the terminal is in an RRC inactive state, wherein the network device that serves the terminal when the terminal enters the RRC inactive state is called an anchor network device, and the relay device used by the terminal to access the anchor network device is a source relay device, and if the terminal initiates RRC connection recovery, the source relay device of the terminal receives indication information from the anchor network device of the terminal, and then the source relay device releases the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the indication information. Therefore, the present application provides a solution for recovering the RRC connection for a terminal that enters an RRC inactive state under a non-direct connection, filling the gap in this technical direction. In addition, some resources of the source relay device are also saved.

[0203] Among them, the method and the device are based on the same application concept. Since the method and the device solve the problem in a similar principle, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0204] The technical solution provided in the embodiment of the present application can be applicable to a variety of systems, especially 5G systems. For example, applicable systems can be global system of mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet radio service (General Packet Radio Service, GPRS) system, long-term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD) system, advanced long-term evolution (Long Term Evolution Advanced, LTE-A) system, universal mobile system (Universal Mobile Telecommunication System, UMTS), global interconnection microwave access (Worldwide Interoperability for Microwave Access, WiMAX) system, 5G new air interface (New Radio, NR) system, etc. These various systems include terminals and network equipment. The system may also include core network parts, such as the Evolved Packet System (EPS), 5G System (5GS), etc.

[0205] The terminal involved in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the name of the terminal may also be different. For example, in a 5G system, the terminal may be called a user equipment (UE). A wireless terminal can communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal may be a mobile terminal, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal. For example, it may be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges language and / or data with a radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs) and other devices. A wireless terminal may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, and a user device, but is not limited thereto in the embodiments of the present application.

[0206] The network device involved in the embodiments of the present application may be a base station, which may include multiple cells providing services for the terminal. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, and serve as a router between the wireless terminal and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile communications (Global System for Mobile communications, GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolutionary network device (evolutional Node B, eNB or e-NodeB) in the Long Term Evolution (Long Term Evolution, LTE) system, a 5G base station (gNB) in the 5G network architecture (next generation system), or a home evolved Node B (Home evolved Node B, HeNB), a relay node, a home base station (femto), a pico base station (pico), etc., which is not limited in the embodiments of the present application. In some network structures, the network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be arranged geographically separately.

[0207] Network devices and terminals can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). Depending on the form and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can be diversity transmission, precoded transmission or beamforming transmission, etc.

[0208] Figure 1 A schematic diagram of an application scenario provided in an embodiment of the present application, such as Figure 1 As shown, this embodiment provides a communication system, which includes multiple network devices and multiple terminals. This embodiment takes 2 network devices and 6 terminal devices as an example, and the network devices are network device 110 and network device 160 respectively.

[0209] The terminal 120 and the terminal 150 are within the coverage of the network device 110, and the signal quality received by the terminal 120 and the terminal 150 from the network device 110 is good. The terminal 120 and the terminal 150 are directly connected to the network device 110 through the Uu interface, that is, the terminal 120 and the terminal 150 can transmit uplink and downlink data / control information with the network device 110 through the Uu interface, which can also be called that the terminal 120 and the terminal 150 communicate with the network device 110 through a direct connection, that is, the connection mode of the terminal 120 and the terminal 150 under the network device 110 is a direct connection. Among them, the terminal 170 and the network device 160 are also similar.

[0210] In some cases, the terminal 130 is out of the coverage of the network device 110, and the terminal 130 cannot receive the signal from the network device 110. If the terminal 130 wants to communicate with the network device 110, the terminal 130 can use the terminal 120 in the short range as a relay device to establish a direct communication link (also called Sidelink or PC5) with the terminal 120. The terminal 130 is connected to the network device 110 through the terminal 120 as a relay device, and this connection method is also called an indirect connection.

[0211] In other cases, the terminal 140 is at the edge of the coverage of the network device 110, and the terminal 140 can receive the signal from the network device 110, but the signal quality is poor. Therefore, the terminal 140 can also use the terminal 150 in the close range as a relay device to establish a direct communication link (also called Sidelink or PC5) with the terminal 150. The terminal 140 is connected to the network device 110 through the terminal 150 as a relay device, and this connection method is also called an indirect connection.

[0212] The wireless interface corresponding to the direct communication link is called a direct communication interface (also called a Sidelink interface or a PC5 interface). The link between the terminal 120 as a relay device and the network device 110 may be called a backhaul link for the terminal 130 .

[0213] In addition, how the terminal 180 communicates with the network device 160 through the terminal 150 can refer to how the terminal 130 communicates with the network device 110 through the terminal 120 .

[0214] Among them, the RRC state of the terminal includes the following: idle state, inactive state, and connected state. When the terminal 130 is in the connected state, if there is no data transmission demand, such as when the user has not used the terminal 130 for a long time, the terminal 130 returns from the connected state to the RRC inactive state so that the connected state can be restored faster later. When the terminal 130 in the RRC inactive state moves to the position of the terminal 120, the terminal 130 is within the direct coverage of the network device 110, and the terminal 130 can communicate directly with the network device 110. Alternatively, when the terminal 130 in the RRC inactive state moves to the position of the terminal 140, the terminal 130 is within the coverage of the terminal 150, and the terminal 130 can communicate indirectly with the network device 110 through the terminal 150 as a relay device. Alternatively, when the terminal 130 in the RRC inactive state moves to the position of the terminal 170, the terminal 130 moves to the direct coverage of the network device 160, and the terminal 130 can communicate directly with the network device 110. Alternatively, when the terminal 130 in the RRC inactive state moves to the location of the terminal 180, the terminal 130 is within the coverage of the terminal 170, and the terminal 130 can communicate indirectly with the network device 160 through the terminal 170 as a relay device. Since the terminal 130 enters the RRC inactive state through the terminal 120 as a relay device under the network device 110, and the terminal 130 has moved out of the communication range with the terminal 120, if the terminal 130 has a data transmission requirement at this time, the RRC connection needs to be restored. In order to solve this requirement, the technical solution of the present application can be adopted. The technical solution is described in detail using various embodiments below.

[0215] Figure 2 A flowchart of a method for restoring a terminal RRC connection provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the method of this embodiment may include:

[0216] S201: The anchor network device sends indication information to the source relay device. Correspondingly, the source relay device receives the indication information sent by the anchor network device.

[0217] In this embodiment, the terminal is a terminal in an RRC inactive state, wherein the network device that serves the terminal when the terminal enters the RRC inactive state is called the anchor network device of the terminal. The relay device used when the terminal accesses the anchor network device of the terminal is called the source relay device, wherein the relay device can be a terminal, or it can also be a network device, and this embodiment does not limit this. That is, the terminal enters the RRC inactive state under the anchor network device of the terminal, and the connection used when the terminal enters the RRC inactive state under the anchor network device of the terminal is an indirect connection (indirect connection), and the indirect connection refers to the RRC connection established between the terminal and the anchor network device of the terminal through the source relay device of the terminal.

[0218] Among them, the process of the terminal entering the RRC inactive state can be: the anchor network device of the terminal sends information indicating entering the RRC inactive state to the terminal through the source relay device of the terminal, the terminal receives the information from the anchor network device through the source relay device of the terminal, and the terminal enters the RRC inactive state according to the information.

[0219] After the terminal enters the RRC inactive state, the terminal will move. It may move to the direct coverage of the network device or other network devices, or it may move to the signal coverage of other devices except the source relay device of the terminal. At this time, when the terminal in the RRC inactive state has a data transmission demand, the terminal needs to restore the RRC connection and may no longer need to rely on the source relay device of the terminal. The anchor network device of the terminal can send an indication message to the source relay device of the terminal, and the indication message is used to instruct the source relay device to release the terminal-related configuration information and / or the direct communication interface connection between the source relay device and the terminal. Accordingly, the source relay device of the terminal receives the above indication message sent by the anchor network device of the terminal.

[0220] In an optional example, the above indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device of the terminal to the source relay device of the terminal. Specifically, the anchor network device of the terminal sends RRC signaling or MAC CE or physical layer signaling to the source relay device of the terminal, and the RRC signaling or MAC CE or physical layer signaling carries the above indication information. Correspondingly, the source relay device of the terminal receives the RRC signaling or MAC CE or physical layer signaling sent by the anchor network device of the terminal, and obtains the above indication information carried in the RRC signaling or MAC CE or physical layer signaling.

[0221] S202: The source relay device releases the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the instruction information.

[0222] In this embodiment, after receiving the indication information sent by the anchor network device of the terminal, the source relay device of the terminal releases the configuration information related to the terminal according to the indication information, or releases the direct communication interface connection between the source relay device of the terminal and the terminal, or releases the configuration information related to the terminal and releases the direct communication interface connection between the source relay device of the terminal and the terminal. As the terminal moves, the terminal may no longer access the anchor network device of the terminal through the source relay device of the terminal, so the source relay device of the terminal does not need to retain the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal, so as to save some resources of the source relay device.

[0223] In an optional example, the terminal-related configuration information includes one or more of the following:

[0224] The mapping relationship between the direct communication interface RLC channel between the terminal and the source relay device of the terminal and the Uu interface RLC channel between the source relay device of the terminal and the anchor network device of the terminal; that is, the mapping relationship between the above-mentioned direct communication interface RLC channel and the above-mentioned Uu interface RLC channel.

[0225] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device of the terminal and the direct communication interface RLC channel between the terminal and the source relay device of the terminal; that is, the mapping relationship between the above end-to-end bearer and the above direct communication interface RLC channel.

[0226] Terminal identification information.

[0227] Optionally, the identification information of the terminal includes any one or more of the following:

[0228] The cell-radio network temporary identifier (C-RNTI) allocated by the anchor network device of the terminal to the terminal;

[0229] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device of the terminal;

[0230] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device of the terminal.

[0231] In an optional example, the direct communication interface connection between the source relay device of the terminal and the terminal includes one or more of the following:

[0232] PC5-S connection between the terminal's source relay device and the terminal;

[0233] PC5-RRC connection between the source relay device of the terminal and the terminal.

[0234] In the method for restoring the RRC connection of a terminal provided in this embodiment, the anchor network device of the terminal sends an indication message to the source relay device of the terminal, and then the source relay device of the terminal releases the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the indication message. Therefore, the present application provides a relevant solution for how a terminal in an RRC inactive state requests to restore the RRC connection when the terminal enters the RRC inactive state through the source relay device under the anchor network device of the terminal. It can also save some resources of the source relay device.

[0235] Based on the above embodiment, in an optional embodiment, a prerequisite for the anchor network device of the terminal to send the indication information to the source relay device of the terminal is any one of the following:

[0236] The terminal initiates RRC connection recovery using a direct connection under the anchor network device of the terminal;

[0237] The terminal initiates RRC connection recovery using an indirect connection under the terminal's anchor network device, and the target relay device is different from the source relay device;

[0238] The terminal initiates RRC connection recovery using a direct connection under the target network device of the terminal;

[0239] The terminal initiates RRC connection recovery using an indirect connection under the target network device of the terminal, and the target relay device of the terminal is different from the source relay device of the terminal;

[0240] The terminal initiates RRC connection recovery using an indirect connection under the target network device of the terminal, and the target relay device of the terminal is different from the source relay device of the terminal;

[0241] Among them, the target network device is the network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to the relay device that serves the terminal when the terminal initiates RRC connection recovery; direct connection refers to the RRC connection established between the terminal and the network device through the Uu interface, and indirect connection refers to the RRC connection established between the terminal and the network device through the relay device.

[0242] In this embodiment, any of the above prerequisites indicates that the terminal does not need to go through the source relay device of the terminal when initiating RRC connection recovery. Therefore, the anchor network device of the terminal instructs the source relay device of the terminal to release the terminal-related configuration information and / or the direct communication interface connection between the source relay device and the terminal, which not only ensures that the RRC connection recovery of the terminal is not affected, but also can save some resources of the source relay device of the terminal in time.

[0243] Based on the above embodiments, in an optional embodiment, before executing the above S201, S200 may also be executed:

[0244] S200: The terminal sends an RRC connection recovery request message to the anchor network device. Correspondingly, the anchor network device receives the RRC connection recovery request message sent by the terminal.

[0245] In this embodiment, when the terminal has a data transmission requirement, it is necessary to initiate RRC connection recovery. Specifically, if the terminal can still communicate with the anchor network device of the terminal, the terminal sends an RRC connection recovery request message to the anchor network device of the terminal.

[0246] In a possible implementation, if the terminal is within the direct coverage of the anchor network device of the terminal, the connection mode used by the terminal under the anchor network device of the terminal is a direct connection, which refers to the RRC connection established between the terminal and the anchor network device of the terminal through the Uu interface, and the terminal initiates RRC connection recovery using the direct connection under the anchor network device of the terminal. That is, the terminal sends an RRC connection recovery request message to the anchor network device of the terminal through the Uu interface. Accordingly, the anchor network device of the terminal receives the RRC connection recovery request message sent by the terminal through the Uu interface, so that it can be determined that the terminal did not initiate RRC connection recovery through the source relay device of the terminal, so the anchor network device can perform the above S201.

[0247] In another possible implementation, if the terminal is within the coverage of the anchor network device of the terminal through the target relay device of the terminal, the target relay device of the terminal is different from the source relay device of the terminal, and the connection mode used by the terminal under the anchor network device of the terminal is a non-direct connection, which refers to the RRC connection established between the terminal and the anchor network device of the terminal through the target relay device, and the terminal initiates RRC connection recovery using a non-direct connection under the anchor network device of the terminal. That is, the terminal sends an RRC connection recovery request message to the target relay device of the terminal, and the target relay device of the terminal forwards the RRC connection recovery request message sent by the terminal to the anchor network device of the terminal. Accordingly, the anchor network device of the terminal receives the RRC connection recovery request message forwarded by the target relay device of the terminal, so that it can be determined that the terminal did not initiate RRC connection recovery through the source relay device of the terminal, so the anchor network device of the terminal can perform the above S201.

[0248] Optionally, after receiving the RRC connection recovery request message sent by the terminal, the anchor network device of the terminal deletes the configuration information related to the source relay device of the terminal under the anchor network device of the terminal in the locally stored terminal context information, and then sends a response message corresponding to the RRC connection recovery request message to the terminal based on the terminal context information after deleting the above configuration information. The response message is, for example, an RRC connection recovery message or an RRC connection reestablishment message. Accordingly, the terminal restores the RRC connection according to the response message to enter the RRC connection state, thereby ensuring that the terminal can normally recover from the RRC inactive state to the RRC connection state.

[0249] Based on the above embodiments, in another optional embodiment, before executing the above S201, S200' may be further executed:

[0250] S200`: The target network device sends a terminal context request message to the anchor network device.

[0251] In this embodiment, when the terminal has a data transmission requirement, it is necessary to initiate RRC connection recovery. Specifically, if the terminal moves within the range of establishing a connection with the target network device of the terminal, the terminal sends an RRC connection recovery request message to the target network device of the terminal.

[0252] In a possible implementation, if the terminal is within the direct coverage of the terminal's target network device, the connection mode used by the terminal under the terminal's target network device is a direct connection, which refers to an RRC connection established between the terminal and the terminal's target network device through a Uu interface, and the terminal initiates RRC connection recovery using a direct connection under the terminal's target network device. That is, the terminal sends an RRC connection recovery request message to the terminal's target network device through the Uu interface. Accordingly, the terminal's target network device receives the RRC connection recovery request message sent by the terminal through the Uu interface.

[0253] In another possible implementation, if the terminal is within the coverage of the terminal's target network device through the terminal's target relay device, the terminal's target relay device is different from the terminal's source relay device, and the terminal uses an indirect connection under the terminal's target network device. The indirect connection refers to an RRC connection established between the terminal and the terminal's target network device through the terminal's target relay device, and the terminal initiates RRC connection recovery using an indirect connection under the terminal's target network device. That is, the terminal sends an RRC connection recovery request message to the terminal's target relay device, and the terminal's target relay device forwards the RRC connection recovery request message sent by the terminal to the terminal's target network device. Accordingly, the terminal's target network device receives the RRC connection recovery request message forwarded by the terminal's target relay device.

[0254] After the target network device of the terminal receives the RRC connection recovery request message sent by the terminal, it needs to obtain the terminal context information from the anchor network device of the terminal. Specifically, the target network device of the terminal sends a terminal context request message to the anchor network device of the terminal through the network device interface, and the terminal context request message is used to request to obtain the terminal context information of the terminal. Accordingly, after the anchor network device of the terminal receives the terminal context request message sent by the target network device of the terminal, it can be determined that the terminal is likely to initiate RRC connection recovery to the target network device of the terminal, so it can be determined that the terminal did not initiate RRC connection recovery through the source relay device, so the anchor network device of the terminal can execute the above S201.

[0255] Optionally, in a possible implementation, after receiving the terminal context request message, the anchor network device of the terminal deletes the configuration information related to the source relay device of the terminal under the anchor network device of the terminal from the locally stored terminal context information, and then sends the terminal context information that deletes the configuration information to the target network device through the network device interface. The target network device of the terminal receives the terminal context information sent by the anchor network device of the terminal after deleting the configuration information through the network device interface, and sends a response message corresponding to the RRC connection recovery request message to the terminal based on the received terminal context information. The response message is, for example, an RRC connection recovery message or an RRC connection reestablishment message. Accordingly, the terminal restores the RRC connection according to the response message to enter the RRC connection state, thereby ensuring that the terminal can normally recover from the RRC inactive state to the RRC connection state.

[0256] Optionally, in another possible implementation, after receiving the terminal context request message, the anchor network device of the terminal sends the locally stored terminal context information to the target network device of the terminal through the network device interface. The target network device of the terminal receives the terminal context information sent by the anchor network device of the terminal through the network device interface, and deletes the configuration information related to the source relay device of the terminal under the anchor network device of the terminal from the received terminal context information, and then sends a response message corresponding to the RRC connection recovery request message to the terminal based on the terminal context information after deleting the configuration information. The response message is, for example, an RRC connection recovery message or an RRC connection reestablishment message. Accordingly, the terminal restores the RRC connection according to the response message to enter the RRC connection state, thereby ensuring that the terminal can normally recover from the RRC inactive state to the RRC connection state.

[0257] The solution of the present application is illustrated below with three specific examples, where the terminal may be referred to as a UE.

[0258] Figure 3This is a flow chart of a method for restoring a terminal RRC connection provided by another embodiment of the present application. In this embodiment, the UE initiates RRC connection restoration using a direct connection under the UE's anchor network device. Figure 3 As shown, the method of this embodiment may include:

[0259] S301. The UE sends an RRC connection recovery request message to the anchor network device.

[0260] In this embodiment, the UE first accesses the network through the UE's source relay device. If the UE has no data transmission requirements, the network device can allow the UE to enter the RRC inactive state (RRC_INACTIVE state). The network device to which the UE is connected when entering the RRC_INACTIVE state is called the UE's anchor network device.

[0261] As the UE moves, the UE enters the direct coverage of the UE's anchor network device. Once the UE has a data transmission requirement, the UE can directly initiate RRC connection recovery through the Uu interface. Specifically, the UE can directly send an RRC connection recovery request message, such as an RRC Resume Request message, to the UE's anchor network device through the Uu interface.

[0262] S302: The anchor network device processes UE context information.

[0263] In this embodiment, after the anchor network device of the UE receives the RRC connection recovery request message (such as the RRCResume Request message) sent by the UE, it is determined that the UE performs RRC connection recovery through a direct connection, and then the configuration information related to the UE's source relay device under the anchor network device of the UE is deleted from the UE context information. A response message corresponding to the RRC connection recovery request message is generated according to the processed UE context information.

[0264] S303: The anchor network device sends a notification message to the source relay device.

[0265] S304: The source relay device releases the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE.

[0266] It should be noted that, in this embodiment, there is no strict sequence between S303 and S301 / S302 .

[0267] In this embodiment, the anchor network device of the UE sends a notification message to the source relay device of the UE to notify the source relay device of the UE to release the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE. Specifically:

[0268] When "the anchor network device of the UE notifies the source relay device of the UE to release the configuration information related to the UE, and / or the direct communication interface connection between the source relay device and the UE", RRC signaling, MAC CE or physical layer signaling can be used.

[0269] The “UE-related configuration information” specifically includes but is not limited to one or a combination of the following:

[0270] The mapping relationship between Uu RLC channel and PC5 RLC channel;

[0271] UE identification information; the UE identification information may be the UE end-to-end identification information at the Uu interface (eg C-RNTI) or the UE PC5 interface identification information (eg a combination of source address + destination address or a combination of source address + destination address + transmission type).

[0272] Among them, the above-mentioned "direct communication interface connection between the source relay device and the UE" may refer to a PC5-S (PC5-signalling) connection and / or a PC5-RRC connection between the relay device and the UE.

[0273] S305. The anchor network device sends a response message corresponding to the RRC connection recovery request message to the UE.

[0274] In this embodiment, the anchor network device of the UE generates a response message (such as an RRC Resume message) corresponding to the RRC connection recovery request message according to the UE context information processed in S302, and then sends a response message corresponding to the RRC connection recovery request message to the UE through the Uu interface.

[0275] Among them, there is no strict order between S305 and S303-S304.

[0276] The method for terminal RRC connection recovery provided in this embodiment is that the UE in the RRC_INACTIVE state initiates RRC connection recovery to the UE's anchor network device through a direct connection, and the UE's anchor network device notifies the UE's source relay device to release the UE-related configuration information and / or the direct communication interface connection between the source relay device and the UE to save part of the resources of the UE's source relay device, and after the UE's anchor network device processes the UE context information, it sends a response message to the UE to indicate that the UE is allowed to restore the RRC connection, so as to complete the UE's recovery from the RRC_INACTIVE state to the RRC_CONNECTED state.

[0277] Figure 4This is a flow chart of a method for restoring a terminal RRC connection provided by another embodiment of the present application. In this embodiment, the UE initiates RRC connection restoration using a non-direct connection (indirect connection) under the anchor network device of the UE. Figure 4 As shown, the method of this embodiment may include:

[0278] S401. The UE sends an RRC connection recovery request message to a target relay device.

[0279] S402: The target relay device forwards the RRC connection recovery request message to the anchor network device.

[0280] First, the UE accesses the network through the UE's source relay device. If the UE has no data transmission requirements, the network device can allow the UE to enter the RRC_INACTIVE state. The network device to which the UE is connected when entering the RRC_INACTIVE state is called the UE's anchor network device.

[0281] As the UE moves, the UE enters the coverage of the target relay device under the UE's anchor network device. Once the UE has a data transmission requirement, the UE can send an RRC connection recovery request message, such as an RRC Resume Request message, to the UE's anchor network device through the UE's target relay device.

[0282] S403: The anchor network device processes the UE context information

[0283] After the anchor network device of the UE receives the RRC connection recovery request message sent by the UE through the target relay device of the UE, the anchor network device of the UE deletes the configuration information related to the source relay device of the UE under the anchor network device of the UE from the UE context information.

[0284] S404: The anchor network device sends a notification message to the source relay device.

[0285] It should be noted that, in this embodiment, there is no strict sequence between S404 and S403 / S406 / S407.

[0286] S405: The source relay device releases the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE.

[0287] The anchor network device of the UE sends a notification message to the source relay device of the UE to notify the source relay device of the UE to release the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE. Specifically:

[0288] When "the anchor network device of the UE notifies the source relay device of the UE to release the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE", RRC signaling, MAC CE or physical layer signaling may be used.

[0289] The “UE-related configuration information” specifically includes but is not limited to one or a combination of the following:

[0290] The mapping relationship between Uu RLC channel and PC5 RLC channel;

[0291] UE identification information; the UE identification information may be the UE end-to-end identification information at the Uu interface (eg C-RNTI) or the UE PC5 interface identification information (eg a combination of source address + destination address or a combination of source address + destination address + transmission type).

[0292] The “direct communication interface connection between the source relay device and the UE” may refer to a PC5-S (PC5-signalling) connection and / or a PC5-RRC connection between the source relay device and the UE.

[0293] S406. The anchor network device sends a response message corresponding to the RRC connection recovery request message to the target relay device.

[0294] S407. The target relay device forwards a response message corresponding to the RRC connection recovery request message to the UE.

[0295] In this embodiment, the anchor network device of the UE generates a response message (such as an RRC Resume message) corresponding to the RRC connection recovery request message based on the UE context information processed in S403, and then sends a response message corresponding to the RRC connection recovery request message to the UE through the target relay device of the UE.

[0296] The method for terminal RRC connection recovery provided in this embodiment is that the UE in the RRC_INACTIVE state initiates RRC connection recovery to the UE's anchor network device through a non-direct connection, and the UE's anchor network device notifies the UE's source relay device to release the UE-related configuration information and / or the direct communication interface connection between the source relay device and the UE to save part of the resources of the UE's source relay device, and after the UE's anchor network device processes the UE's context information, it sends a response message to the terminal UE through the UE's target relay device to indicate that the UE is allowed to restore the RRC connection, so as to complete the UE's recovery from the RRC_INACTIVE state to the RRC_CONNECTED state.

[0297] Figure 5This is a flow chart of a method for restoring a terminal RRC connection provided by another embodiment of the present application. In this embodiment, the UE initiates RRC connection restoration using a non-direct connection (indirect connection) under the target network device of the UE. Figure 5 As shown, the method of this embodiment may include:

[0298] S501. UE sends an RRC connection recovery request message to a target relay device.

[0299] S502: The target relay device forwards the RRC connection recovery request message to the anchor network device.

[0300] First, the UE accesses the network through the UE's source relay device. If the UE has no data transmission requirements, the network device can allow the UE to enter the RRC_INACTIVE state. The network device to which the UE is connected when entering the RRC_INACTIVE state is called the UE's anchor network device.

[0301] As the UE moves, the UE enters the coverage of the target relay device under the target network device of the UE. Once the UE has a data transmission requirement, the UE may send an RRC connection recovery request, such as an RRC Resume Request message, to the target network device of the UE through the target relay device of the UE.

[0302] S503: The target network device sends a UE context request message to the anchor network device.

[0303] After the target network device of the UE receives the RRC connection recovery request message sent by the UE, it sends a UE context request message (UE context request message) to the anchor network device of the UE through the network device interface (such as the base station Xn interface). Taking the NR system as an example, the UE context request message can be RETRIEVE UE CONTEXT REQUEST.

[0304] S504: The anchor network device processes the UE context information.

[0305] S505. The anchor network device sends UE context information to the target network device.

[0306] After the anchor network device of the UE receives the UE context request message through the network device interface, the anchor network device of the UE may perform operations described in any of the following ways:

[0307] Method 1: After the anchor network device of the UE receives the UE context request message sent by the target network device of the UE, it deletes the configuration information related to the UE and the source relay device under the anchor network device from the UE context information, and then sends the processed UE context information to the target network device of the UE through the interface between the network devices (such as the Xn interface).

[0308] Method 2: After the anchor network device of the UE receives the UE context request message sent by the target network device of the UE, it directly sends the stored UE context information to the target network device of the UE through the interface between the network devices (such as the Xn interface), and the target network device of the UE deletes the configuration information related to the source relay device of the UE under the anchor network device of the UE.

[0309] It should be noted that Figure 5 The flowchart shown is described by taking the above-mentioned method 1 as an example.

[0310] S506: The anchor network device sends a notification message to the source relay device.

[0311] It should be noted that, in this embodiment, there is no strict sequence between S506 and S504 / S507 / S508 / S509.

[0312] S507: The source relay device releases the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE.

[0313] The anchor network device of the UE sends a notification message to the source relay device of the UE to notify the source relay device of the UE to release the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE. Specifically:

[0314] When "the anchor network device of the UE notifies the source relay device of the UE to release the configuration information related to the UE and / or the direct communication interface connection between the source relay device and the UE", RRC signaling, MAC CE or physical layer signaling may be used.

[0315] The “UE-related configuration information” specifically includes but is not limited to one or a combination of the following:

[0316] The mapping relationship between Uu RLC channel and PC5 RLC channel;

[0317] UE identification information; the UE identification information may be the UE end-to-end identification information at the Uu interface (eg C-RNTI) or the UE PC5 interface identification information (eg a combination of source address + destination address or a combination of source address + destination address + transmission type).

[0318] The “direct communication interface connection between the source relay device and the UE” may refer to a PC5-S (PC5-signalling) connection and / or a PC5-RRC connection between the source relay device and the UE.

[0319] S508. The target network device sends a response message corresponding to the RRC connection recovery request message to the target relay device.

[0320] S509. The target relay device forwards a response message corresponding to the RRC connection recovery request message to the UE.

[0321] The target network device of the UE generates a response message (such as an RRC Resume message) corresponding to the RRC connection recovery request message according to the UE context information obtained in S505, and then sends a response message corresponding to the RRC connection recovery request message to the UE through the target relay device of the UE.

[0322] The method for terminal RRC connection recovery provided in this embodiment is that a UE in an RRC_INACTIVE state initiates an RRC connection recovery to a target network device of the UE through a non-direct connection, and the target network device of the UE obtains UE context information from an anchor network device of the UE, and the anchor network device of the UE notifies the source relay device of the UE to release UE-related configuration information and / or a direct communication interface connection between the source relay device and the UE to save part of the resources of the source relay device of the UE, and the target network device of the UE sends a response message to the UE through the target relay device of the UE based on the UE context information to indicate that the UE is allowed to restore the RRC connection, so as to complete the recovery of the UE from the RRC_INACTIVE state to the RRC_CONNECTED state.

[0323] On the relay side, the embodiment of the present application provides a device for recovering a terminal RRC connection, such as Figure 6 As shown, the terminal RRC connection recovery device of this embodiment may be a source relay device of the terminal. Taking the source relay device as an example, the terminal RRC connection recovery device may include a transceiver 601, a processor 602 and a memory 603.

[0324] The transceiver 601 is used to receive and send data under the control of the processor 602 .

[0325] Among them, Figure 6In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 602 and various circuits of memory represented by memory 603 are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 601 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which transmission medium includes wireless channels, wired channels, optical cables and other transmission media. Optionally, the data transmission control device may also include a user interface 604. For different user devices, the user interface 604 may also be an interface capable of externally connecting or internally connecting required devices, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0326] The processor 602 is responsible for managing the bus architecture and general processing, and the memory 603 can store data used by the processor 602 when performing operations.

[0327] Optionally, the processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (CPLD), and the processor may also adopt a multi-core architecture.

[0328] The processor 602 is used to execute any of the methods related to the terminal provided in the embodiments of the present application according to the obtained executable instructions by calling the computer program stored in the memory 603. The processor 602 and the memory 603 can also be arranged physically separately.

[0329] Specifically, the processor 602 is configured to perform the following operations:

[0330] Receiving instruction information from an anchor network device of the terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0331] Release the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the instruction information;

[0332] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0333] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0334] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0335] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0336] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0337] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0338] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0339] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0340] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device to the source relay device.

[0341] Optionally, the terminal-related configuration information includes one or more of the following:

[0342] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0343] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0344] Terminal identification information.

[0345] Optionally, the identification information of the terminal includes any one or more of the following:

[0346] The C-RNTI allocated by the anchor network device to the terminal;

[0347] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0348] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0349] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0350] PC5-S connection between source relay device and terminal;

[0351] PC5-RRC connection between the source relay device and the terminal.

[0352] It should be noted here that the above-mentioned device provided in the present application can implement all the method steps implemented by the source relay device of the terminal in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0353] On the network side, the embodiment of the present application provides a device for recovering a terminal RRC connection, such as Figure 7 As shown, the terminal RRC connection recovery device of this embodiment may be an anchor network device of the terminal, and the terminal RRC connection recovery device includes: a transceiver 701, a processor 702 and a memory 703.

[0354] The transceiver 701 is used to receive and send data under the control of the processor 702 .

[0355] Among them, Figure 7 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 702 and memory represented by memory 703. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 701 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which transmission medium may include a wireless channel, a wired channel, an optical cable, and the like. The processor 702 is responsible for managing the bus architecture and general processing, and the memory 703 may store data used by the processor 702 when performing operations.

[0356] The processor 702 may be a CPU, an ASIC, an FPGA or a CPLD, and the processor may also adopt a multi-core architecture.

[0357] The processor 702 is used to execute any of the methods related to the target network device provided in the embodiments of the present application according to the obtained executable instructions by calling the computer program stored in the memory 703. The processor and the memory can also be arranged physically separately.

[0358] Specifically, the processor 702 is configured to perform the following operations:

[0359] Sending instruction information to a source relay device of the terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0360] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0361] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0362] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0363] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0364] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0365] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0366] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0367] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0368] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device to the source relay device.

[0369] Optionally, the terminal-related configuration information includes one or more of the following:

[0370] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0371] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0372] Terminal identification information.

[0373] Optionally, the identification information of the terminal includes any one or more of the following:

[0374] The C-RNTI allocated by the anchor network device to the terminal;

[0375] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0376] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0377] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0378] PC5-S connection between source relay device and terminal;

[0379] PC5-RRC connection between the source relay device and the terminal.

[0380] Optionally, the processor 702 is further configured to perform the following operations:

[0381] Before sending the indication information to the source relay device of the terminal, receiving a terminal context request message sent by the target network device of the terminal;

[0382] The target network device refers to the network device that serves the terminal when the terminal initiates RRC connection recovery.

[0383] Optionally, the processor 702 is further configured to perform the following operations:

[0384] According to the terminal context request message, delete the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally;

[0385] The deleted terminal context information is sent to the target network device through the network device interface.

[0386] Optionally, the processor 702 is further configured to perform the following operations:

[0387] According to the terminal context request message, the terminal context information stored locally is sent to the target network device through the network device interface.

[0388] Optionally, the processor 702 is further configured to perform the following operations:

[0389] Before sending the indication information to the source relay device of the terminal, an RRC connection recovery request message sent by the terminal is received.

[0390] Optionally, the processor 702 is further configured to perform the following operations:

[0391] After receiving the RRC connection recovery request message from the terminal, deleting the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally;

[0392] According to the deleted terminal context information, a response message corresponding to the RRC connection recovery request message is sent to the terminal.

[0393] It should be noted here that the above-mentioned device provided in the present application can implement all the method steps implemented by the anchor network device of the terminal in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0394] On the relay side, the embodiment of the present application also provides a device for recovering a terminal RRC connection, such as Figure 8 As shown, the terminal RRC connection recovery device of this embodiment may be a source relay device of the terminal, and the terminal RRC connection recovery device includes: a receiving unit 801 and a processing unit 802.

[0395] A receiving unit 801 is configured to receive instruction information from an anchor network device of a terminal, wherein the instruction information is used to instruct a source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0396] A processing unit 802 is configured to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal according to the indication information;

[0397] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0398] Optionally, the prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following:

[0399] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0400] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0401] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0402] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0403] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0404] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0405] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the anchor network device to the source relay device.

[0406] Optionally, the terminal-related configuration information includes one or more of the following:

[0407] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0408] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0409] Terminal identification information.

[0410] Optionally, the identification information of the terminal includes any one or more of the following:

[0411] The C-RNTI allocated by the anchor network device to the terminal;

[0412] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0413] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0414] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0415] PC5-S connection between source relay device and terminal;

[0416] PC5-RRC connection between the source relay device and the terminal.

[0417] It should be noted here that the above-mentioned device provided in the present application can implement all the method steps implemented by the source relay device of the terminal in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0418] On the network side, the embodiment of the present application also provides a device for recovering a terminal RRC connection, such as Fig. 9 As shown, the terminal RRC connection recovery device in this embodiment may be an anchor network device of the terminal, and the terminal RRC connection recovery device includes: a sending unit 901.

[0419] A sending unit 901 is used to send instruction information to a source relay device of a terminal, wherein the instruction information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal;

[0420] Among them, the anchor network device refers to the network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to the relay device used when the terminal accesses the anchor network device.

[0421] Optionally, a prerequisite for the sending unit 901 to send the indication information to the source relay device is any one of the following:

[0422] The terminal initiates RRC connection recovery using a direct connection under the anchor network device;

[0423] The terminal initiates RRC connection recovery using an indirect connection under the anchor network device, and the target relay device is different from the source relay device;

[0424] The terminal initiates RRC connection recovery using a direct connection under the target network device;

[0425] The terminal initiates RRC connection recovery using an indirect connection under the target network device, and the target relay device is different from the source relay device;

[0426] The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery;

[0427] A direct connection refers to an RRC connection established between a terminal and a network device through a Uu interface, and an indirect connection refers to an RRC connection established between a terminal and a network device through a relay device.

[0428] Optionally, the indication information is carried by RRC signaling, MAC CE or physical layer signaling sent by the sending unit 901 to the source relay device.

[0429] Optionally, the terminal-related configuration information includes one or more of the following:

[0430] A mapping relationship between a direct communication interface RLC channel between a terminal and a source relay device and a Uu interface RLC channel between the source relay device and an anchor network device;

[0431] The mapping relationship between the end-to-end bearer between the terminal and the anchor network device and the direct communication interface RLC channel between the terminal and the source relay device;

[0432] Terminal identification information.

[0433] Optionally, the identification information of the terminal includes any one or more of the following:

[0434] The C-RNTI allocated by the anchor network device to the terminal;

[0435] A combination of a source address and a destination address of a direct communication interface between a terminal and a source relay device;

[0436] The combination of source address, destination address, and transmission type of the direct communication interface between the terminal and the source relay device.

[0437] Optionally, the direct communication interface connection between the source relay device and the terminal includes one or more of the following:

[0438] PC5-S connection between source relay device and terminal;

[0439] PC5-RRC connection between the source relay device and the terminal.

[0440] Optionally, the device further includes: a receiving unit 902.

[0441] The receiving unit 902 is configured to receive a terminal context request message sent by a target network device of the terminal before the sending unit 901 sends the indication information to the source relay device of the terminal;

[0442] The target network device refers to the network device that serves the terminal when the terminal initiates RRC connection recovery.

[0443] Optionally, the device further includes: a processing unit 903.

[0444] The processing unit 903 is configured to delete the configuration information related to the source relay device of the terminal under the anchor network device from the locally stored terminal context information according to the terminal context request message;

[0445] The sending unit 901 is further configured to send the deleted terminal context information to the target network device via the network device interface.

[0446] Optionally, the sending unit 901 is further configured to enable the anchor network device to send the locally stored terminal context information to the target network device through the network device interface according to the terminal context request message.

[0447] Optionally, the device further includes: a receiving unit 902.

[0448] The receiving unit 902 is configured to receive an RRC connection recovery request message sent by the terminal before the sending unit 901 sends the indication information to the source relay device of the terminal.

[0449] Optionally, the device further includes: a processing unit 903.

[0450] The processing unit 903 is configured to delete the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally after the receiving unit 902 receives the RRC connection recovery request message from the terminal;

[0451] The sending unit 901 is further configured to send a response message corresponding to the RRC connection recovery request message to the terminal according to the deleted terminal context information.

[0452] It should be noted here that the above-mentioned device provided in the present application can implement all the method steps implemented by the anchor network device of the terminal in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0453] It should be noted that the division of units in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0454] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0455] On the relay side, an embodiment of the present application provides a processor-readable storage medium, which stores a computer program, and the computer program is used to enable the processor to execute any of the methods provided by the embodiment of the present application for the source relay device of the terminal. The processor is enabled to implement all the method steps implemented by the source relay device of the terminal in the above method embodiment, and the same technical effect can be achieved. The parts and beneficial effects that are the same as those in the method embodiment in this embodiment will not be specifically described here.

[0456] On the network side, an embodiment of the present application provides a processor-readable storage medium, which stores a computer program, and the computer program is used to enable the processor to execute any of the methods for the anchor network device of the terminal provided in the embodiment of the present application. The processor is enabled to implement all the method steps implemented by the anchor network device of the terminal in the above method embodiment, and the same technical effect can be achieved. The parts and beneficial effects that are the same as those in the method embodiment will not be specifically described here.

[0457] On the relay side, an embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements all the method steps implemented by the source relay device in the above method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those of the method embodiment will not be described in detail here.

[0458] On the network side, an embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements all the method steps implemented by the anchor network device of the terminal in the above method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0459] The processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid-state drive (SSD)), etc.

[0460] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0461] The present application is described with reference to the flowcharts and / or block diagrams of the methods, apparatuses, and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer executable instructions. These computer executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0462] These processor executable instructions may also be stored in a processor readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0463] These processor-executable instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0464] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for restoring a terminal radio resource control (RRC) connection, characterized in that: The method comprises: A source relay device of a terminal receives indication information from an anchor network device of the terminal, wherein the indication information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal; The source relay device releases the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the indication information; The anchor network device refers to a network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to a relay device used when the terminal accesses the anchor network device; The prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following: The terminal initiates RRC connection recovery using a direct connection under the anchor network device; The terminal initiates RRC connection recovery using a non-direct connection under the anchor network device, and the target relay device is different from the source relay device; The terminal initiates RRC connection recovery using a direct connection under the target network device; The terminal initiates RRC connection recovery using an indirect connection under a target network device, and the target relay device is different from the source relay device; The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery; The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

2. The method according to claim 1, characterized in that The indication information is carried by RRC signaling, media access control MAC control element CE or physical layer signaling sent by the anchor network device to the source relay device.

3. The method according to claim 1, characterized in that The terminal-related configuration information includes one or more of the following: A mapping relationship between a direct communication interface radio link control channel RLC channel between the terminal and the source relay device and a Uu interface RLC channel between the source relay device and the anchor network device; a mapping relationship between an end-to-end bearer between the terminal and the anchor network device and a direct communication interface RLC channel between the terminal and the source relay device; The identification information of the terminal.

4. The method according to claim 3, characterized in that The identification information of the terminal includes any one or more of the following: A cell radio network temporary identifier C-RNTI allocated by the anchor network device to the terminal; A combination of a source address and a destination address of a direct communication interface between the terminal and the source relay device; A combination of a source address, a destination address, and a transmission type of a direct communication interface between the terminal and the source relay device.

5. The method according to any one of claims 1 to 4, characterized in that: The direct communication interface connection between the source relay device and the terminal includes one or more of the following: A PC5-S connection between the source relay device and the terminal; A PC5-RRC connection between the source relay device and the terminal.

6. A method for restoring a terminal radio resource control (RRC) connection, characterized in that: The method comprises: The anchor network device of the terminal sends indication information to the source relay device of the terminal, wherein the indication information is used to instruct the source relay device to release the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal; The anchor network device refers to a network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to a relay device used when the terminal accesses the anchor network device; The prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following: The terminal initiates RRC connection recovery using a direct connection under the anchor network device; The terminal initiates RRC connection recovery using a non-direct connection under the anchor network device, and the target relay device is different from the source relay device; The terminal initiates RRC connection recovery using a direct connection under the target network device; The terminal initiates RRC connection recovery using an indirect connection under a target network device, and the target relay device is different from the source relay device; The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery; The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

7. The method according to claim 6, characterized in that The indication information is carried by RRC signaling, media access control MAC control element CE or physical layer signaling sent by the anchor network device to the source relay device.

8. The method according to claim 6, characterized in that The terminal-related configuration information includes one or more of the following: A mapping relationship between a direct communication interface radio link control channel RLC channel between the terminal and the source relay device and a Uu interface RLC channel between the source relay device and the anchor network device; a mapping relationship between an end-to-end bearer between the terminal and the anchor network device and a direct communication interface RLC channel between the terminal and the source relay device; The identification information of the terminal.

9. The method according to claim 8, characterized in that The identification information of the terminal includes any one or more of the following: A cell radio network temporary identifier C-RNTI allocated by the anchor network device to the terminal; A combination of a source address and a destination address of a direct communication interface between the terminal and the source relay device; A combination of a source address, a destination address, and a transmission type of a direct communication interface between the terminal and the source relay device.

10. The method according to claim 6, characterized in that The direct communication interface connection between the source relay device and the terminal includes one or more of the following: A PC5-S connection between the source relay device and the terminal; A PC5-RRC connection between the source relay device and the terminal.

11. The method according to any one of claims 6 to 10, characterized in that: Before the anchor network device sends the indication information to the source relay device of the terminal, the method further includes: The anchor network device receives a terminal context request message sent by a target network device of the terminal; The target network device refers to a network device that serves the terminal when the terminal initiates RRC connection recovery.

12. The method according to claim 11, characterized in that The method further comprises: The anchor network device deletes the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally according to the terminal context request message; The anchor network device sends the deleted terminal context information to the target network device through the network device interface.

13. The method according to claim 11, characterized in that The method further comprises: The anchor network device sends the terminal context information stored locally to the target network device through the network device interface according to the terminal context request message.

14. The method according to any one of claims 6 to 11, characterized in that: Before the anchor network device sends the indication information to the source relay device of the terminal, the method further includes: The anchor network device receives the RRC connection recovery request message sent by the terminal.

15. The method according to claim 14, characterized in that After the anchor network device receives the RRC connection recovery request message from the terminal, the method further includes: The anchor network device deletes the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally; The anchor network device sends a response message corresponding to the RRC connection recovery request message to the terminal according to the deleted terminal context information.

16. A device for recovering a terminal radio resource control (RRC) connection, characterized in that: including memory, transceiver and processor; The memory is used to store computer programs; The transceiver is used to send and receive data under the control of the processor; The processor is configured to read the computer program in the memory and perform the following operations: receiving instruction information from an anchor network device of the terminal, wherein the instruction information is used to instruct a source relay device of the terminal to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal; Release the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the indication information; The anchor network device refers to a network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to a relay device used when the terminal accesses the anchor network device; The prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following: The terminal initiates RRC connection recovery using a direct connection under the anchor network device; The terminal initiates RRC connection recovery using a non-direct connection under the anchor network device, and the target relay device is different from the source relay device; The terminal initiates RRC connection recovery using a direct connection under the target network device; The terminal initiates RRC connection recovery using an indirect connection under a target network device, and the target relay device is different from the source relay device; The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery; The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

17. The device according to claim 16, characterized in that The indication information is carried by RRC signaling, media access control MAC control element CE or physical layer signaling sent by the anchor network device to the source relay device.

18. The device according to claim 16, characterized in that The terminal-related configuration information includes one or more of the following: A mapping relationship between a direct communication interface radio link control channel RLC channel between the terminal and the source relay device and a Uu interface RLC channel between the source relay device and the anchor network device; a mapping relationship between an end-to-end bearer between the terminal and the anchor network device and a direct communication interface RLC channel between the terminal and the source relay device; The identification information of the terminal.

19. The device according to claim 18, characterized in that The identification information of the terminal includes any one or more of the following: A cell radio network temporary identifier C-RNTI allocated by the anchor network device to the terminal; A combination of a source address and a destination address of a direct communication interface between the terminal and the source relay device; A combination of a source address, a destination address, and a transmission type of a direct communication interface between the terminal and the source relay device.

20. The device according to any one of claims 16 to 19, characterized in that The direct communication interface connection between the source relay device and the terminal includes one or more of the following: A PC5-S connection between the source relay device and the terminal; A PC5-RRC connection between the source relay device and the terminal.

21. A device for recovering a terminal radio resource control (RRC) connection, characterized in that: An anchor network device applied to a terminal, the device comprising a memory, a transceiver and a processor; The memory is used to store computer programs; The transceiver is used to send and receive data under the control of the processor; The processor is configured to read the computer program in the memory and perform the following operations: Sending indication information to a source relay device of the terminal, wherein the indication information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal; The anchor network device refers to a network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to a relay device used when the terminal accesses the anchor network device; The prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following: The terminal initiates RRC connection recovery using a direct connection under the anchor network device; The terminal initiates RRC connection recovery using a non-direct connection under the anchor network device, and the target relay device is different from the source relay device; The terminal initiates RRC connection recovery using a direct connection under the target network device; The terminal initiates RRC connection recovery using an indirect connection under a target network device, and the target relay device is different from the source relay device; The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery; The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

22. The device according to claim 21, characterized in that The indication information is carried by RRC signaling, media access control MAC control element CE or physical layer signaling sent by the anchor network device to the source relay device.

23. The device according to claim 21, characterized in that The terminal-related configuration information includes one or more of the following: A mapping relationship between a direct communication interface radio link control channel RLC channel between the terminal and the source relay device and a Uu interface RLC channel between the source relay device and the anchor network device; a mapping relationship between an end-to-end bearer between the terminal and the anchor network device and a direct communication interface RLC channel between the terminal and the source relay device; The identification information of the terminal.

24. The device according to claim 23, characterized in that The identification information of the terminal includes any one or more of the following: A cell radio network temporary identifier C-RNTI allocated by the anchor network device to the terminal; A combination of a source address and a destination address of a direct communication interface between the terminal and the source relay device; A combination of a source address, a destination address, and a transmission type of a direct communication interface between the terminal and the source relay device.

25. The device according to claim 21, characterized in that The direct communication interface connection between the source relay device and the terminal includes one or more of the following: A PC5-S connection between the source relay device and the terminal; A PC5-RRC connection between the source relay device and the terminal.

26. The device according to any one of claims 21 to 25, characterized in that The processor is further configured to perform the following operations: Before sending the indication information to the source relay device of the terminal, receiving a terminal context request message sent by the target network device of the terminal; The target network device refers to a network device that serves the terminal when the terminal initiates RRC connection recovery.

27. The device according to claim 26, characterized in that The processor is further configured to perform the following operations: According to the terminal context request message, deleting configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally; The deleted terminal context information is sent to the target network device through the network device interface.

28. The device according to claim 26, characterized in that The processor is further configured to perform the following operations: According to the terminal context request message, the terminal context information stored locally is sent to the target network device through an interface between network devices.

29. The device according to any one of claims 22 to 25, characterized in that The processor is further configured to perform the following operations: Before sending the indication information to the source relay device of the terminal, an RRC connection recovery request message sent by the terminal is received.

30. The device according to claim 29, characterized in that The processor is further configured to perform the following operations: After receiving the RRC connection recovery request message from the terminal, deleting the configuration information related to the source relay device of the terminal under the anchor network device from the terminal context information stored locally; According to the deleted terminal context information, a response message corresponding to the RRC connection recovery request message is sent to the terminal.

31. A device for recovering a terminal radio resource control (RRC) connection, characterized in that: include: a receiving unit, configured to receive instruction information from an anchor network device of the terminal, wherein the instruction information is used to instruct a source relay device of the terminal to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal; a processing unit, configured to release the configuration information related to the terminal and / or the direct communication interface connection between the source relay device and the terminal according to the indication information; The anchor network device refers to a network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to a relay device used when the terminal accesses the anchor network device; The prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following: The terminal initiates RRC connection recovery using a direct connection under the anchor network device; The terminal initiates RRC connection recovery using a non-direct connection under the anchor network device, and the target relay device is different from the source relay device; The terminal initiates RRC connection recovery using a direct connection under the target network device; The terminal initiates RRC connection recovery using an indirect connection under a target network device, and the target relay device is different from the source relay device; The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery; The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

32. A device for recovering a terminal radio resource control (RRC) connection, characterized in that: An anchor network device applied to a terminal, the device comprising: A sending unit, configured to send indication information to a source relay device of the terminal, wherein the indication information is used to instruct the source relay device to release configuration information related to the terminal and / or a direct communication interface connection between the source relay device and the terminal; The anchor network device refers to a network device that serves the terminal when the terminal enters the RRC inactive state, and the source relay device refers to a relay device used when the terminal accesses the anchor network device; The prerequisite for the anchor network device to send the indication information to the source relay device is any one of the following: The terminal initiates RRC connection recovery using a direct connection under the anchor network device; The terminal initiates RRC connection recovery using a non-direct connection under the anchor network device, and the target relay device is different from the source relay device; The terminal initiates RRC connection recovery using a direct connection under the target network device; The terminal initiates RRC connection recovery using an indirect connection under a target network device, and the target relay device is different from the source relay device; The target network device is a network device that serves the terminal when the terminal initiates RRC connection recovery, and the target relay device refers to a relay device that serves the terminal when the terminal initiates RRC connection recovery; The direct connection refers to an RRC connection established between the terminal and the network device through a Uu interface, and the indirect connection refers to an RRC connection established between the terminal and the network device through a relay device.

33. A processor-readable storage medium, characterized in that: The processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the method according to any one of claims 1 to 5 or any one of claims 6 to 15.

34. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 5 or any one of claims 6 to 15 is implemented.

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