CN114599120A

CN114599120A - Method and device for recovering RRC (radio resource control) connection of terminal

Info

Publication number: CN114599120A
Application number: CN202011391413.9A
Authority: CN
Inventors: 赵亚利; 张惠英
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2022-06-07
Also published as: WO2022116820A1

Abstract

The application provides a method and a device for recovering RRC connection of a terminal, wherein the method comprises the following steps: the anchor point network equipment of the terminal sends indication information to the source relay equipment of the terminal, and then the source relay equipment releases configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal according to the indication information. Therefore, the method and the device provide a scheme for recovering the RRC connection for the terminal which enters the RRC non-activated state under the indirect connection, and fill the blank of the technical direction. Partial resources of the source relay device may also be saved.

Description

Method and device for recovering RRC (radio resource control) connection of terminal

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for recovering Radio Resource Control (RRC) connection of a terminal.

Background

With the development of communication technology, the arrangement of network devices (such as base stations) has been gradually increased, and the coverage area of a mobile communication network is greatly increased. However, inevitably, some areas still have a mobile signal coverage blind area, and in order to solve this problem, a UE-to-Network Relay (hereinafter referred to as Relay) from a terminal to a Network device is introduced, and the Relay may be a device with a Relay function. If the terminal enters the coverage of another terminal, the another terminal can be used as a relay device of the terminal, wherein the relay device communicates with the network device through the Uu interface, and the terminal communicates with the relay device through a direct communication link (also called sildelink or PC5), so that the terminal can communicate with the network device through the relay device, and the purpose of expanding the network coverage of the network device is achieved. At this time, the connection between the terminal and the network device is indirect.

The RRC state of the terminal comprises the following steps: an idle state, an inactive state, and a connected state. When the terminal is in the connected state, if there is no data transmission requirement, the terminal may return from the connected state to the inactive state, so as to recover the connected state more quickly in the following. However, at present, there is no relevant solution for how to perform RRC connection recovery for a terminal entering an RRC inactive state under indirect connection.

Disclosure of Invention

The application provides a method and a device for recovering RRC connection of a terminal, which provide a scheme for recovering RRC connection for the terminal which enters an RRC non-activated state under indirect connection, and fill the blank of the technical direction.

In a first aspect, the present application provides a method for recovering an RRC connection of a terminal, including:

the method comprises the steps that source relay equipment of a terminal receives indication information from anchor point network equipment of the terminal, wherein the indication information is used for indicating the source relay equipment to release configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal;

the source relay equipment releases the configuration information related to the terminal and/or the direct communication interface connection between the source relay equipment and the terminal according to the indication information;

the anchor network device is a network device serving the terminal when the terminal enters an RRC (radio resource control) inactive state, and the source relay device is a relay device used when the terminal accesses the anchor network device.

Optionally, a precondition that the anchor network device sends the indication information to the source relay device is any of:

the terminal initiates RRC connection recovery by using direct connection under the anchor point network equipment;

the terminal initiates RRC connection recovery by using indirect connection under the anchor point network equipment, and the target relay equipment is different from the source relay equipment;

the terminal initiates RRC connection recovery by using direct connection under the target network equipment;

the terminal initiates RRC connection recovery by using indirect connection under target network equipment, and the target relay equipment is different from the source relay equipment;

the target network equipment serves the terminal when the terminal initiates RRC connection recovery, and the target relay equipment refers to relay equipment serving the terminal when the terminal initiates RRC connection recovery;

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

Optionally, the indication information is carried by an RRC signaling, a media access Control MAC Control Element (CE), or a physical layer signaling, which is sent to the source relay device by the anchor point network device.

Optionally, the configuration information related to the terminal includes one or more of the following items:

mapping relation between Radio Link Control (RLC) channels of direct communication interfaces between the terminal and the source relay device and Uu interfaces between the source relay device and the anchor network device;

the mapping relation between the end-to-end bearing between the terminal and the anchor point network equipment and the direct communication interface RLC channel between the terminal and the source relay equipment;

identification information of the terminal.

Optionally, the identification information of the terminal includes any one or more of the following items:

anchor point network equipment allocates a cell radio network temporary identifier C-RNTI for 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;

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

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

PC5-S connection between the source relay device and the terminal;

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

In a second aspect, the present application provides a method for recovering an RRC connection of a terminal, including:

the method comprises the steps that anchor point network equipment of a terminal sends indication information to source relay equipment of the terminal, wherein the indication information is used for indicating the source relay equipment to release configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal;

Optionally, the precondition that the anchor point network device sends the indication information to the source relay device is any one of the following:

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

mapping relation between a direct communication interface RLC channel between the terminal and the source relay equipment and a Uu interface RLC channel between the source relay equipment and the anchor point network equipment;

identification information of the terminal.

a Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the terminal by the anchor point Network equipment;

PC5-S connection between the source relay device and the terminal;

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

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

the anchor point network equipment receives a terminal context request message sent by target network equipment of a terminal;

the target network device is a network device serving the terminal when the terminal initiates the RRC connection recovery.

Optionally, the method further includes:

according to the terminal context request message, the anchor point network equipment deletes the configuration information of the terminal related to the source relay equipment under the anchor point network equipment from the locally stored terminal context/context information;

and the anchor point network equipment sends the deleted context/context information of the terminal to the target network equipment through an interface between the network equipment.

Optionally, the method further includes:

and the anchor point network sends the locally stored context information of the terminal to the target network equipment through the interface between the network equipment according to the context request message of the terminal.

and the anchor point network equipment receives the RRC connection recovery request message sent by the terminal.

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

the anchor point network device deletes the configuration information of the terminal related to the source relay device under the anchor point network device from the locally stored context/context information of the terminal;

and the anchor point network equipment sends a response message corresponding to the RRC connection recovery request message to the terminal according to the deleted context/context information of the terminal.

In a third aspect, the present application provides an apparatus for RRC connection recovery of a terminal, including a memory, a transceiver, and a processor;

a memory for storing a computer program;

a transceiver for transceiving data under the control of the processor;

a processor for reading the computer program in the memory and performing the following:

receiving indication information from anchor point network equipment of a terminal, wherein the indication information is used for indicating source relay equipment to release configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal;

releasing configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal according to the indication information;

the terminal initiates RRC connection recovery by using indirect connection under the anchor network equipment, and the target relay equipment is different from the source relay equipment;

the terminal initiates RRC connection recovery by using indirect connection under target network equipment, wherein the target relay equipment is different from the source relay equipment;

the direct connection refers to RRC connection established between the terminal and the network device through the Uu interface, and the indirect connection refers to RRC connection established between the terminal and the network device through the relay device.

identification information of the terminal.

C-RNTI distributed to the terminal by the anchor point network equipment;

the combination of the source address, the destination address and the transmission type of the direct communication interface between the terminal and the source relay equipment.

PC5-S connection between the source relay device and the terminal;

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

In a fourth aspect, the present application provides an apparatus for recovering RRC connection of a terminal, where the apparatus is applied to an anchor network device, and the apparatus includes a memory, a transceiver, and a processor;

a memory for storing a computer program;

a transceiver for transceiving data under the control of the processor;

a processor for reading the computer program in the memory and performing the following operations:

sending indication information to source relay equipment of the terminal, wherein the indication information is used for indicating the source relay equipment to release configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal;

identification information of the terminal.

C-RNTI distributed to the terminal by the anchor point network equipment;

PC5-S connection between the source relay device and the terminal;

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

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

before sending indication information to source relay equipment of a terminal, receiving a terminal context request message sent by target network equipment of the terminal;

according to the terminal context request message, deleting configuration information of the terminal related to the source relay equipment under the anchor point network equipment from the locally stored terminal context/context information;

and sending the deleted terminal context/context information to the target network equipment through an interface between the network equipment.

and sending the locally stored terminal context/context information to the target network equipment through an interface between the network equipment according to the terminal context request message.

before the indication information is sent to the source relay equipment of the terminal, the RRC connection recovery request message sent by the terminal is received.

after receiving an RRC connection recovery request message from a terminal, deleting configuration information of the terminal related to a source relay device under anchor point network equipment from locally stored context/context information of the terminal;

and sending a response message corresponding to the RRC connection recovery request message to the terminal according to the deleted context/context information of the terminal.

In a fifth aspect, the present application provides an apparatus for RRC connection recovery of a terminal, including:

a receiving unit, configured to receive indication information from an anchor network device of a terminal, where the indication information is used to indicate a source relay device to release configuration information related to the terminal and/or direct communication interface connection between the source relay device and the terminal;

the processing unit is used for releasing the configuration information related to the terminal and/or the direct communication interface connection between the source relay equipment and the terminal according to the indication information;

the mapping relation between an end-to-end bearing between the terminal and the anchor point network equipment and a direct communication interface RLC channel between the terminal and the source relay equipment;

identification information of the terminal.

C-RNTI distributed to the terminal by the anchor point network equipment;

PC5-S connection between the source relay device and the terminal;

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

In a sixth aspect, the present application provides an apparatus for RRC connection recovery of a terminal, including:

the system comprises a sending unit, a receiving unit and a sending unit, wherein the sending unit is used for sending indication information to source relay equipment of a terminal, and the indication information is used for indicating the source relay equipment to release configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal;

Optionally, a precondition that the sending unit sends the indication information to the source relay device is any one of the following:

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

identification information of the terminal.

C-RNTI distributed to the terminal by the anchor point network equipment;

PC5-S connection between the source relay device and the terminal;

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

Optionally, the apparatus further comprises:

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

Optionally, the apparatus further comprises:

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

and the sending unit is also used for sending the deleted context information of the terminal to the target network equipment through the interface between the network equipment.

Optionally, the sending unit is further configured to send the locally stored context/context information of the terminal to the target network device through an interface between the network devices according to the context request message of the terminal.

Optionally, the apparatus further comprises:

and the receiving unit is used for receiving the RRC connection recovery request message sent by the terminal before the sending unit sends the indication information to the source relay equipment of the terminal.

Optionally, the apparatus further comprises:

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

and the sending unit is further used for sending a response message corresponding to the RRC connection recovery request message to the terminal according to the deleted context/context information of the terminal.

In a seventh aspect, the present application provides a processor-readable storage medium storing a computer program for causing a processor to perform the method of the first or second aspect.

In an eighth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, performs the method of any one of the first or second aspects.

In a ninth aspect, the present application provides a terminal RRC connection recovery system, including the anchor point network device as described in any above and the source relay device as described in any above.

The application provides a method and a device for recovering RRC connection of a terminal, wherein anchor point network equipment of the terminal sends indication information to source relay equipment of the terminal, and then the source relay equipment releases configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal according to the indication information. Therefore, the method and the device provide a relevant solution for how the terminal in the RRC inactive state requests to recover the RRC connection under the condition that the terminal enters the RRC inactive state through the source relay device under the anchor point network device. Partial resources of the source relay device may also be saved.

It should be understood that what is described in the summary above is not intended to limit key or critical features of embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;

fig. 2 is a flowchart of a method for RRC connection recovery of a terminal according to an embodiment of the present application;

fig. 3 is a flowchart of a method for RRC connection recovery of a terminal according to another embodiment of the present application;

fig. 4 is a flowchart of a method for RRC connection recovery of a terminal according to another embodiment of the present application;

fig. 5 is a flowchart of a method for RRC connection recovery of a terminal according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of an apparatus for RRC connection recovery of a terminal according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an apparatus for RRC connection recovery of a terminal according to another embodiment of the present application;

fig. 8 is a schematic structural diagram of an apparatus for RRC connection recovery of a terminal according to another embodiment of the present application;

fig. 9 is a schematic structural diagram of an apparatus for recovering RRC connection of a terminal according to another embodiment of the present application.

Detailed Description

The term "and/or" in this application, describing the association relationship of the associated objects, means that there may be three relationships, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a method and a device for recovering RRC connection of a terminal, wherein when the terminal is in an RRC inactive state, a network device serving the terminal when the terminal enters the RRC inactive state is called anchor point network device, a relay device used by the terminal for accessing the anchor point network device is source relay device, if the terminal initiates the RRC connection recovery, the source relay device of the terminal receives indication information from the anchor point network device of the terminal, and then the source relay device releases configuration information related to the terminal and/or direct communication interface connection between the source relay device and the terminal according to the indication information. Therefore, the method and the device provide a scheme for recovering the RRC connection for the terminal which enters the RRC non-activated state under the indirect connection, and fill the blank of the technical direction. In addition, partial resources of the source relay equipment are saved.

The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, the applicable System may be a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (General Packet Radio Service, GPRS) System, a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (Frequency Division Duplex, FDD) System, a LTE Time Division Duplex (TDD) System, a Long Term Evolution (Long Term Evolution Access, LTE-a) System, a Universal Mobile Telecommunications System (UMTS), a Universal Mobile telecommunications Access (WiMAX) System, a New Radio network Access (NR 5, WiMAX) System, etc. These various systems include terminals and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5GS), and the like.

The terminal referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. In different systems, the names of terminals may be different, for example, in a 5G system, a terminal may be called a User Equipment (UE). A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, e.g., a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). A wireless terminal may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for providing services to a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals, or by other names, depending on the particular application. The network device may be configured to exchange received air frames with Internet Protocol (IP) packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), may be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may be a evolved Node B (eNB or e-NodeB) in a Long Term Evolution (Long Term Evolution, LTE) System, may be a 5G Base Station (gbb) in a 5G network architecture (next generation System), may be a Home evolved Node B (Home B, HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico Base Station), and the like, and is not limited in the embodiments of the present application. In some network architectures, network devices may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

The network device and the terminal may each use one or more antennas for Multiple Input Multiple Output (MIMO) transmission, and the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of root antenna combinations.

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application, and as shown in fig. 1, the embodiment provides a communication system, where the communication system includes a plurality of network devices and a plurality of terminals, where in the embodiment, 2 network devices and 6 terminal devices are taken as examples, and the network devices are network device 110 and network device 160, respectively.

The terminals 120 and 150 are within the coverage of the network device 110, and the quality of the signals received by the terminals 120 and 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, the terminal 150 and the network device 110 may perform transmission of uplink and downlink data/control information through the Uu interface, which may also be called that the terminal 120 and the terminal 150 communicate with the network device 110 through direct (direct) connection, that is, the connection mode of the terminal 120 and the terminal 150 under the network device 110 is direct connection. Wherein the terminal 170 is similar to the network device 160.

In some cases, terminal 130 is outside the coverage area of network device 110, and terminal 130 does not receive signals from network device 110. If terminal 130 wants to communicate with network device 110, terminal 130 may establish a direct communication link (also known as a Sidelink or PC5) with terminal 120 using terminal 120 within a short range as a relay device. The terminal 130 is connected to the network device 110 through the terminal 120 as a relay device, and this connection manner is also referred to as indirect (indiect) connection.

In other cases, where terminal 140 is in an edge coverage area of network device 110, terminal 140 may be able to receive signals from network device 110, but the signal quality is poor. Terminal 140 may also establish a direct communication link (also referred to as Sidelink or PC5) with terminal 150 using terminal 150 in a close range as a relay device. Terminal 140 is connected to network device 110 through terminal 150, which is a relay device, in a manner also referred to as indiect connection.

The wireless interface to which the direct communication link corresponds is referred to as a direct communication interface (also referred to as a Sidelink interface or a PC5 interface). The link between the terminal 120 and the network device 110 as the relay device may be referred to as a Backhaul link (Backhaul link) for the terminal 130.

In addition, how terminal 180 communicates with network device 160 through terminal 150 may be seen in how terminal 130 communicates with network device 110 through terminal 120.

The RRC state of the terminal comprises the following steps: an idle state, an inactive state, and a connected state. When the terminal 130 is in the connected state, if there is no data transmission requirement, for example, when the user does not use the terminal 130 for a long time, the terminal 130 falls back from the connected state to the RRC inactive state, so as to recover the connected state more quickly in the following. When the terminal 130 in the RRC inactive state moves to the location of the terminal 120, the terminal 130 is in the direct coverage of the network device 110, and the terminal 130 can directly communicate with the network device 110. Alternatively, when the terminal 130 in the RRC inactive state moves to the location of the terminal 140, the terminal 130 is in the coverage of the terminal 150, and the terminal 130 may indirectly communicate 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 location of the terminal 170, the terminal 130 moves to the direct coverage area of the network device 160, and the terminal 130 can directly communicate 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 in the coverage of the terminal 170, and the terminal 130 may indirectly communicate with the network device 160 through the terminal 170 serving as a relay device. Since the terminal 130 enters the RRC inactive state through the terminal 120 as the relay device under the network device 110, and the terminal 130 has moved out of the communication range with the terminal 120, at this time, if the terminal 130 has a data transmission requirement, the RRC connection needs to be recovered. In order to solve the requirement, the technical scheme of the application can be adopted. The technical solution is described in detail below using various embodiments.

Fig. 2 is a flowchart of a method for recovering RRC connection of a terminal according to an embodiment of the present disclosure, and as shown in fig. 2, the method of this embodiment may include:

s201, the anchor point network device sends indication information to the source relay device. Accordingly, the source relay device receives the indication information sent by the anchor network device.

In this embodiment, the terminal is in an RRC inactive state, where a network device serving the terminal when the terminal enters the RRC inactive state is referred to as an anchor network device of the terminal. A relay device used when the terminal accesses the anchor network device of the terminal is called a source relay device, where the relay device may be a terminal or may also be a network device, and this embodiment is not limited thereto. That is, the terminal enters the RRC inactive state under the anchor network device of the terminal, and the connection used by the terminal when entering the RRC inactive state under the anchor network device of the terminal is an indirect connection (indirect connection), which is an RRC connection established between the terminal and the anchor network device of the terminal through the source relay device of the terminal.

The process of the terminal entering the RRC inactive state may be: the anchor point network device of the terminal sends information for indicating to enter the RRC non-activated state to the terminal through the source relay device of the terminal, the terminal receives the information from the anchor point network device through the source relay device of the terminal, and the terminal enters the RRC non-activated state according to the information.

After the terminal enters the RRC inactive state, the terminal may move, and may move to a direct coverage area of the network device or another network device, or may move to a signal coverage area of another device except for the source relay device of the terminal. At this time, when the terminal in the RRC inactive state has a data transmission requirement, the terminal needs to recover the RRC connection, and may not depend on the source relay device of the terminal. The anchor point network device of the terminal may send indication information to the source relay device of the terminal, where the indication information is used to indicate the source relay device to release configuration information related to the terminal and/or direct communication interface connection between the source relay device and the terminal. Correspondingly, the source relay device of the terminal receives the indication information sent by the anchor network device of the terminal.

In an optional example, the 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 point network device of the terminal sends an RRC signaling, or an MAC CE, or a physical layer signaling to the source relay device of the terminal, where the RRC signaling, or the MAC CE, or the physical layer signaling carries the indication information. Correspondingly, the source relay device of the terminal receives the RRC signaling or the MAC CE or the physical layer signaling sent by the anchor point network device of the terminal, and acquires the indication information carried in the RRC signaling or the MAC CE or the physical layer signaling.

S202, the source relay equipment releases the configuration information related to the terminal and/or the direct communication interface connection between the source relay equipment and the terminal according to the indication information.

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 that the source relay device of the terminal does not need to retain configuration information related to the terminal and/or direct communication interface connection between the source relay device and the terminal, so as to save part of resources of the source relay device.

In an alternative example, the terminal-related configuration information includes one or more of the following:

mapping relation between a direct communication interface (RLC) channel between a terminal and source relay equipment of the terminal and a Uu interface (RLC) channel between the source relay equipment of the terminal and anchor point network equipment of the terminal; that is, the mapping relationship between the direct communication interface RLC channel and the Uu interface RLC channel.

The mapping relation between the end-to-end bearing between the terminal and the anchor point network equipment of the terminal and the direct communication interface RLC channel between the terminal and the source relay equipment of the terminal; i.e. the mapping between the end-to-end bearer and the direct communication interface RLC channel.

Identification information of the terminal.

an anchor point Network device of the terminal allocates a Cell-Radio Network Temporary Identifier (C-RNTI) for the terminal;

a combination of a source address and a destination address of a direct communication interface between a terminal and source relay equipment of the terminal;

the combination of the source address, the destination address and the transmission type of the direct communication interface between the terminal and the source relay equipment of the terminal.

In an alternative example, the direct communication interface connection between the source relay device of the terminal and the terminal includes one or more of:

the source relay equipment of the terminal is connected with the PC5-S between the terminals;

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

In the method for recovering RRC connection of a terminal provided in this embodiment, an anchor point network device of the terminal sends indication information to a source relay device of the terminal, and then the source relay device of the terminal releases 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. Therefore, the method and the device provide a relevant solution for how the terminal in the RRC inactive state requests to recover the RRC connection under the condition that the terminal enters the RRC inactive state through the source relay device under the anchor point network device of the terminal. Partial resources of the source relay device may also be saved.

On the basis of the foregoing embodiment, in an optional embodiment, a precondition that the anchor point network device of the terminal sends the indication information to the source relay device of the terminal is any of the following:

the terminal initiates RRC connection recovery by using direct connection under the anchor point network equipment of the terminal;

the terminal initiates RRC connection recovery by using indirect connection under anchor point network equipment of the terminal, and target relay equipment is different from source relay equipment;

the terminal initiates RRC connection recovery by using direct connection under the target network equipment of the terminal;

the method comprises the steps that a terminal initiates RRC connection recovery by using indirect connection under target network equipment of the terminal, and target relay equipment of the terminal is different from source relay equipment of the terminal;

the target network equipment serves the terminal when the terminal initiates RRC connection recovery, and the target relay equipment refers to relay equipment serving the terminal when the terminal initiates RRC connection recovery; the direct connection refers to RRC connection established between the terminal and the network device through the Uu interface, and the indirect connection refers to RRC connection established between the terminal and the network device through the relay device.

In this embodiment, any of the above preconditions indicates that the terminal does not need to pass through the source relay device of the terminal when initiating the RRC connection recovery, and therefore, the anchor point network device of the terminal instructs the source relay device of the terminal to release the configuration information related to the terminal and/or the direct communication interface connection between the source relay device and the terminal, which ensures that the RRC connection recovery of the terminal is not affected and can save part of resources of the source relay device of the terminal in time.

On the basis of the foregoing embodiments, in an alternative embodiment, before performing the foregoing S201, S200 may be further performed:

s200, the terminal sends RRC connection recovery request information to the anchor point network equipment. Accordingly, the anchor network device receives the RRC connection recovery request message sent by the terminal.

In this embodiment, when the terminal has a data transmission requirement, it needs to initiate RRC connection recovery. Specifically, if the terminal can also communicate with the anchor network device of the terminal, the terminal transmits an RRC connection recovery request message to the anchor network device of the terminal.

In a possible implementation manner, if the terminal is located in the direct coverage range of the anchor network device of the terminal, the connection mode used by the terminal under the anchor network device of the terminal is direct connection, where the direct connection refers to RRC connection established by the terminal and the anchor network device of the terminal through a Uu interface, and the terminal initiates RRC connection recovery under the anchor network device of the terminal by using direct connection. That is, the terminal transmits the RRC connection restoration 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 does not initiate RRC connection recovery through the source relay device of the terminal, so the anchor network device can perform the above S201.

In another possible implementation manner, if the terminal is located in the coverage range of the anchor point 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 point network device of the terminal is indirect connection, where the indirect connection refers to RRC connection established by the terminal and the anchor point network device of the terminal through the target relay device, and the terminal initiates RRC connection recovery under the anchor point network device of the terminal by using the indirect connection. 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 does not initiate RRC connection recovery through the source relay device of the terminal, so that the anchor network device of the terminal can perform the above S201.

Optionally, after receiving the RRC connection recovery request message sent by the terminal, the anchor network device of the terminal deletes, from the locally stored context information of the terminal, configuration information of the terminal related to the source relay device of the terminal under the anchor network device of the terminal, and then sends, to the terminal, a response message corresponding to the RRC connection recovery request message according to the context information of the terminal after deleting the configuration information. Such as an RRC connection resume message or an RRC connection reestablishment message. Accordingly, the terminal restores the RRC connection according to the response message to enter the RRC connected state, so that the terminal can be normally restored to the RRC connected state from the RRC non-activated state.

On the basis of the foregoing embodiments, in another optional embodiment, before performing the foregoing S201, S200' may be further performed:

s200', the target network device sends a terminal context request message to the anchor network device.

In this embodiment, when the terminal has a data transmission requirement, it needs to initiate RRC connection recovery. Specifically, if the terminal moves into a range in which a connection is established with a target network device of the terminal, the terminal transmits an RRC connection restoration request message to the target network device of the terminal.

In a possible implementation manner, if the terminal is in the direct coverage of the target network device of the terminal, the connection mode used by the terminal under the target network device of the terminal is direct connection, where the direct connection refers to RRC connection established by the terminal and the target network device of the terminal through a Uu interface, and the terminal initiates RRC connection recovery under the target network device of the terminal by using the direct connection. That is, the terminal transmits the RRC connection restoration request message to the target network device of the terminal through the Uu interface. Accordingly, the target network device of the terminal receives the RRC connection recovery request message sent by the terminal through the Uu interface.

In another possible implementation manner, if the terminal is in the coverage range of the target 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 target network device of the terminal is indirect connection, where the indirect connection refers to RRC connection established by the target relay device of the terminal between the terminal and the target network device of the terminal through the target relay device of the terminal, and the terminal initiates RRC connection recovery under the target network device of the terminal using the indirect connection. That is, the terminal transmits the RRC connection restoration request message to the target relay device of the terminal, and the target relay device of the terminal forwards the RRC connection restoration request message transmitted by the terminal to the target network device of the terminal. Accordingly, the target network device of the terminal receives the RRC connection recovery request message forwarded by the target relay device of the terminal.

After receiving the RRC connection recovery request message sent by the terminal, the target network device of the terminal needs to obtain context information of the terminal from the anchor network device of the terminal. Specifically, a target network device of a terminal sends a terminal context request message to an anchor network device of the terminal through an interface between network devices, where the terminal context request message is used to request to acquire terminal context information of the terminal. Accordingly, after receiving the terminal context request message sent by the target network device of the terminal, the anchor network device of the terminal may determine that the terminal is likely to initiate RRC connection recovery to the target network device of the terminal, and thus may determine that the terminal does not initiate RRC connection recovery through the source relay device, so the anchor network device of the terminal may perform S201 described above.

Optionally, in a possible implementation manner, after receiving the terminal context request message, the anchor point network device of the terminal deletes, from the locally stored context information of the terminal, configuration information of the terminal related to the source relay device of the terminal under the anchor point network device of the terminal, and then sends, through an interface between network devices, the context information of the terminal with the configuration information deleted to the target network device. And the target network equipment of the terminal receives the terminal context information which is sent by the anchor point network equipment of the terminal and is deleted from the configuration information through the interface between the network equipment, and sends a response message corresponding to the RRC connection recovery request message to the terminal according to the received terminal context information. Such as an RRC connection resume message or an RRC connection reestablishment message. Accordingly, the terminal restores the RRC connection according to the response message to enter the RRC connected state, so that the terminal can be normally restored to the RRC connected state from the RRC non-activated state.

Optionally, in another possible implementation manner, after receiving the terminal context request message, the anchor network device of the terminal sends the locally stored terminal context/context information to the target network device of the terminal through the interface between the network devices. The target network equipment of the terminal receives the context information of the terminal sent by the anchor point network equipment of the terminal through the interface between the network equipment, deletes the configuration information of the terminal related to the source relay equipment of the terminal under the anchor point network equipment of the terminal from the received context information of the terminal, and then sends a response message corresponding to the RRC connection recovery request message to the terminal according to the context information of the terminal after deleting the configuration information. Such as 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 connected state, so that the terminal can be normally restored to the RRC connected state from the RRC non-activated state.

The scheme of the present application is illustrated below by 3 specific examples, and a terminal may be referred to as a UE.

Fig. 3 is a flowchart of a method for recovering an RRC connection of a terminal according to another embodiment of the present disclosure, where in this embodiment, a UE initiates an RRC connection recovery by using a direct connection (direct connection) under an anchor network device of the UE. As shown in fig. 3, the method of this embodiment may include:

s301, the UE sends an RRC connection recovery request message to the anchor network equipment.

In this embodiment, the UE first accesses the network through the source relay device of the UE, and if the UE does not have a data transmission requirement, the network device may enable the UE to enter an RRC INACTIVE state (RRC _ INACTIVE state), and a network device connected when the UE enters the RRC _ INACTIVE state is referred to as an anchor network device of the UE.

As the UE moves, the UE enters a direct coverage area of an anchor network device of the UE, and once the UE has a data transmission requirement, the UE can directly initiate RRC connection recovery through a Uu interface. A specific UE may directly send an RRC connection recovery Request message, such as an RRC Resume Request message, to an anchor network device of the UE through a Uu interface.

S302, the anchor network equipment processes the context information of the UE.

In this embodiment, after receiving an RRC connection recovery Request message (e.g., an RRC Resume Request message) sent by the UE, the anchor network device of the UE determines that the UE performs RRC connection recovery through direct connection, and then deletes configuration information of the UE, which is related to the source relay device of the UE under the anchor network device of the UE, from context information of the UE. And generating a response message corresponding to the RRC connection recovery request message according to the processed UE context/context information.

And S303, the anchor point network equipment sends a notification message to the source relay equipment.

S304, the source relay equipment releases the configuration information related to the UE and/or the direct communication interface connection between the source relay equipment and the UE.

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

In this embodiment, the anchor point 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, the method comprises the following steps:

the "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" may specifically use RRC signaling, MAC CE, or physical layer signaling.

The "UE-related configuration information" specifically includes but is not limited to one or a combination of the following:

mapping relation between Uu RLC channel and PC5 RLC channel;

identification information of the UE; the identity information of the UE may be the identity information of the UE from end to end on the Uu interface (e.g. C-RNTI) or the identity information of the PC5 interface of the UE (e.g. the combination of source address + destination address or the combination of source address + destination address + transmission type).

The above-mentioned "direct communication interface connection between the source relay device and the UE" may refer to a PC5-S (PC 5-signaling) connection and/or a PC5-RRC connection between the relay device and the UE.

S305, the anchor point network equipment sends a response message corresponding to the RRC connection recovery request message to the UE.

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

Wherein, there is no strict sequence between S305 and S303-S304.

In the method for recovering RRC connection of a terminal provided in this embodiment, a UE in an RRC _ INACTIVE state initiates RRC connection recovery to an anchor network device of the UE through direct connection, the anchor network device of the UE notifies a source relay device of the UE to release configuration information related to the UE and/or direct communication interface connection between the source relay device and the UE, so as to save part of resources of the source relay device of the UE, and after processing context information of the UE, the anchor network device of the UE sends a response message to the UE to indicate that the UE is allowed to recover RRC connection, so as to complete recovery of the UE from the RRC _ INACTIVE state back to an RRC _ CONNECTED state.

Fig. 4 is a flowchart of a method for recovering an RRC connection of a terminal according to another embodiment of the present disclosure, where in this embodiment, a UE initiates an RRC connection recovery by using an indirect connection (indiect connection) under an anchor network device of the UE. As shown in fig. 4, the method of this embodiment may include:

s401, the UE sends an RRC connection recovery request message to the target relay equipment.

S402, the target relay device transmits the RRC connection recovery request message to the anchor network device.

First, the UE accesses the network through the source relay device of the UE, and if the UE does not have a data transmission requirement, the network device may let the UE enter an RRC _ INACTIVE state, and the network device connected when the UE enters the RRC _ INACTIVE state is referred to as an anchor network device of the UE.

As the UE moves, the UE enters a coverage area of a target relay device under an anchor network device of the UE, and once the UE has a data transmission requirement, the UE may send an RRC connection recovery Request message, such as an RRC Resume Request message, to the anchor network device of the UE through the target relay device of the UE.

S403, the anchor point network device processes the context information of the UE

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 configuration information of the UE related to the source relay device of the UE under the anchor network device of the UE from the context information of the UE.

S404, the anchor point network device sends a notification message to the source relay device.

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

S405, the source relay equipment releases the configuration information related to the UE and/or the direct communication interface connection between the source relay equipment and the UE.

The anchor point network equipment of the UE sends a notification message to the source relay equipment of the UE so as to notify the source relay equipment of the UE to release the configuration information related to the UE and/or the direct communication interface connection between the source relay equipment and the UE. Specifically, the method comprises the following steps:

the "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" may specifically use RRC signaling, MAC CE, or physical layer signaling.

mapping relation between Uu RLC channel and PC5 RLC channel;

The "direct communication interface connection between the source relay device and the UE" may refer to a PC5-S (PC 5-signaling) connection and/or a PC5-RRC connection between the source relay device and the UE.

S406, the anchor point network device sends a response message corresponding to the RRC connection recovery request message to the target relay device.

S407, the target relay device forwards a response message corresponding to the RRC connection recovery request message to the UE.

In this embodiment, the anchor network device of the UE generates a response message (for example, an RRC Resume message) corresponding to the RRC connection recovery request message according to the context information of the UE processed in S403, and then sends the response message corresponding to the RRC connection recovery request message to the UE through the target relay device of the UE.

In the method for recovering RRC connection of a terminal according to this embodiment, the UE in the RRC _ INACTIVE state initiates RRC connection recovery to the anchor network device of the UE through indirect connection, the anchor network device of the UE notifies the source relay device of the UE to release configuration information related to the UE and/or direct communication interface connection between the source relay device and the UE, so as to save part of resources of the source relay device of the UE, and after processing context/context information of the UE, the anchor network device of the UE sends a response message to the terminal UE through the target relay device of the UE, so as to instruct the UE to allow the UE to recover RRC connection, so as to complete recovery of the UE from the RRC _ INACTIVE state back to the RRC _ CONNECTED state.

Fig. 5 is a flowchart of a method for recovering RRC connection of a terminal according to another embodiment of the present disclosure, where in this embodiment, a UE initiates RRC connection recovery by using indirect connection (index connection) under a target network device of the UE. As shown in fig. 5, the method of this embodiment may include:

s501, the UE sends an RRC connection recovery request message to the target relay equipment.

S502, the target relay device forwards the RRC connection recovery request message to the anchor network device.

As the UE moves, the UE enters a coverage area of a target relay device under a target network device of the UE, and 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.

S503, the target network device sends a UE context request message to the anchor network device.

After receiving the RRC connection recovery request message sent by the UE, the target network device of the UE sends a UE context request message (UE context request message) to the anchor network device of the UE through an inter-network device interface (such as an inter-base station Xn interface). Taking the NR system as an example, the UE CONTEXT REQUEST message may be a RETRIEVE UE CONTEXT REQUEST.

And S504, the anchor point network equipment processes the context information of the UE.

S505, the anchor point network device sends UE context information to the target network device.

After the anchor network device of the UE receives the UE context request message through the inter-network device interface, the anchor network device of the UE may use the operations described in any of the following manners:

the first method is as follows: after receiving a UE context request message sent by a target network device of the UE, an anchor network device of the UE deletes configuration information of the UE related to a 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 an interface (such as an Xn interface) between network devices.

The second method comprises the following steps: after receiving a UE context request message sent by a target network device of the UE, an anchor network device of the UE directly sends the stored UE context information to the target network device of the UE through an interface (such as an Xn interface) between the network devices, and the target network device of the UE deletes configuration information of the UE related to a source relay device of the UE under the anchor network device of the UE.

The flowchart shown in fig. 5 is described by taking the above-described first embodiment as an example.

S506, the anchor point network device sends a notification message to the source relay device.

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

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.

mapping relation between Uu RLC channel and PC5 RLC channel;

S508, the target network device sends a response message corresponding to the RRC connection restoration request message to the target relay device.

S509, the target relay device forwards a response message corresponding to the RRC connection restoration request message to the UE.

The target network device of the UE generates a response message (for example, an RRC Resume message) corresponding to the RRC connection recovery request message according to the UE context information acquired in S505, and then sends the response message corresponding to the RRC connection recovery request message to the UE through the target relay device of the UE.

In the method for recovering RRC connection of a terminal according to this embodiment, the UE in the RRC _ active state initiates RRC connection recovery to the target network device of the UE through indirect connection, the target network device of the UE acquires context information of the UE from the anchor network device of the UE, the anchor network device of the UE notifies the source relay device of the UE to release configuration information related to the UE and/or direct communication interface connection between the source relay device and the UE, so as to save part of 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 according to the context information of the UE, so as to instruct the UE to allow the UE to recover RRC connection, so as to complete recovery of the UE from the RRC _ active state back to the RRC _ CONNECTED state.

On the relay side, an apparatus for recovering an RRC connection of a terminal is provided in an embodiment of the present application, as shown in fig. 6, the apparatus for recovering an RRC connection of a terminal in this embodiment may be a source relay device of the terminal, and taking the source relay device as an example, the apparatus for recovering an RRC connection of a terminal may include a transceiver 601, a processor 602, and a memory 603.

A transceiver 601 for receiving and transmitting data under the control of the processor 602.

Wherein in fig. 6 the bus architecture may comprise any number of interconnected buses and bridges, with one or more processors, represented by the processor 602, and various circuits, represented by the memory 603, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 601 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over transmission media including wireless channels, wired channels, fiber optic cables, and the like. Optionally, the data transmission control apparatus may further include a user interface 604, and for different user devices, the user interface 604 may also be an interface capable of connecting and disconnecting a desired device, where the connected device includes but is not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 602 is responsible for managing the bus architecture and general processing, and the memory 603 may store data used by the processor 602 in performing operations.

Alternatively, 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 may also adopt a multi-core architecture.

The processor 602 is configured to execute any of the methods provided by the embodiments of the present application with respect to the terminal by calling the computer program stored in the memory 603 according to the obtained executable instructions. The processor 602 and the memory 603 may also be physically separated.

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

identification information of the terminal.

C-RNTI distributed by the anchor point network equipment for the terminal;

PC5-S connection between the source relay device and the terminal;

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

It should be noted that, the apparatus provided in the present application can implement all the method steps implemented by the source relay device of the terminal in the foregoing method embodiments, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiments are omitted here.

On the network side, an embodiment of the present application provides a device for recovering an RRC connection of a terminal, as shown in fig. 7, the device for recovering an RRC connection of a terminal of the present embodiment may be an anchor network device of the terminal, and the device for recovering an RRC connection of a terminal includes: a transceiver 701, a processor 702, and a memory 703.

A transceiver 701 for receiving and transmitting data under the control of the processor 702.

Where, in fig. 7, the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors, represented by the processor 702, and various circuits, represented by the memory 703, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 701 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, 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 in performing operations.

The processor 702 may be a CPU, ASIC, FPGA or CPLD, and the processor may also employ a multi-core architecture.

The processor 702 is configured to execute any of the methods provided by the embodiments of the present application with respect to the target network device by calling the computer program stored in the memory 703 according to the obtained executable instructions. The processor and memory may also be physically separated.

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

identification information of the terminal.

C-RNTI distributed by the anchor point network equipment for the terminal;

PC5-S connection between the source relay device and the terminal;

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

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

and sending the deleted context information of the terminal to the target network equipment through an interface between the network equipment.

It should be noted that, the apparatus provided in this application can implement all the method steps implemented by the anchor point network device of the terminal in the foregoing method embodiment, and can achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

On the relay side, an embodiment of the present application further provides a device for recovering an RRC connection of a terminal, as shown in fig. 8, the device for recovering an RRC connection of a terminal of the present embodiment may be a source relay device of the terminal, where the device for recovering an RRC connection of a terminal includes: a receiving unit 801 and a processing unit 802.

A receiving unit 801, configured to receive indication information from an anchor network device of a terminal, where the indication 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;

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

identification information of the terminal.

C-RNTI distributed by the anchor point network equipment for the terminal;

PC5-S connection between the source relay device and the terminal;

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

On the network side, an embodiment of the present application further provides a device for recovering RRC connection of a terminal, as shown in fig. 9, the device for recovering RRC connection of a terminal of this embodiment may be an anchor point network device of the terminal, and the device for recovering RRC connection of the terminal includes: a transmitting unit 901.

A sending unit 901, configured to send indication information to a source relay device of a terminal, where the indication information is used to instruct the source relay device to release configuration information related to the terminal and/or direct communication interface connection between the source relay device and the terminal;

Optionally, the precondition for the sending unit 901 to send the indication information to the source relay device is any of the following:

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.

identification information of the terminal.

C-RNTI distributed to the terminal by the anchor point network equipment;

PC5-S connection between the source relay device and the terminal;

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

Optionally, the apparatus further comprises: a receiving unit 902.

A receiving unit 902, configured to receive a terminal context request message sent by a target network device of a terminal before the sending unit 901 sends the indication information to a source relay device of the terminal;

Optionally, the apparatus further comprises: a processing unit 903.

A processing unit 903, configured to delete, according to the terminal context request message, configuration information of the terminal related to the source relay device under the anchor network device from locally stored context/context information of the terminal;

the sending unit 901 is further configured to send the deleted context information of the terminal to the target network device through the interface between the network devices.

Optionally, the sending unit 901 is further configured to send, by the anchor network, the locally stored context/context information of the terminal to the target network device through the interface between network devices according to the terminal context request message.

Optionally, the apparatus further comprises: a receiving unit 902.

A receiving unit 902, configured to receive the RRC connection restoration request message sent by the terminal before the sending unit 901 sends the indication information to the source relay device of the terminal.

Optionally, the apparatus further comprises: a processing unit 903.

A processing unit 903, configured to delete, after the receiving unit 902 receives the RRC connection restoration request message from the terminal, configuration information of the terminal related to the source relay device under the anchor network device from locally stored context/context information of the terminal;

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 context/context information of the terminal.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solutions of the present application, which are essential or contributing to the prior art, or all or part of the technical solutions may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

On the relay side, embodiments of the present application provide a processor-readable storage medium, where a computer program is stored, and the computer program is configured to enable a processor to execute any one of the methods provided in embodiments of the present application with respect to 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 achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

On the network side, an embodiment of the present application provides a processor-readable storage medium, where a computer program is stored, and the computer program is configured to enable a processor to execute any of the methods provided in the embodiment of the present application with respect to an anchor network device of a terminal. The processor is enabled to implement all the method steps implemented by the anchor point network device of the terminal in the above method embodiments, and the same technical effect can be achieved, and detailed descriptions of the same parts and beneficial effects as those of the method embodiments in this embodiment are not repeated here.

On the relay side, an embodiment of the present application provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, all the method steps implemented by the source relay device in the foregoing method embodiments are implemented, and the same technical effects can be achieved.

On the network side, an embodiment of the present application provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, all the method steps implemented by the anchor target network device of the terminal in the foregoing method embodiments are implemented, and the same technical effects can be achieved.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such 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 intended to include such modifications and variations as well.

Claims

1. A method for recovering Radio Resource Control (RRC) connection of a terminal, the method comprising:

a source relay device of a terminal receives indication information from an anchor point network device of the terminal, wherein the indication information is used for indicating the source relay device to release configuration information related to the terminal and/or direct communication interface connection between the source relay device and the terminal;

2. The method of claim 1, wherein a precondition for the anchor network device to send the indication information to the source relay device is any one of:

the terminal initiates RRC connection recovery by using indirect connection under the anchor point network equipment, and target relay equipment is different from the source relay equipment;

the terminal initiates RRC connection recovery by using direct connection under target network equipment;

the target network device serves the terminal when the terminal initiates RRC connection recovery, and the target relay device is a relay device serving the terminal when the terminal initiates RRC connection recovery;

3. The method of claim 1, wherein 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.

4. The method of claim 1, wherein the terminal-related configuration information comprises one or more of:

a mapping relation between a direct communication interface radio link control channel (RLC) channel between the terminal and the source relay equipment and a Uu interface RLC channel between the source relay equipment and the anchor point network equipment;

identification information of the terminal.

5. The method according to claim 4, wherein the identification information of the terminal comprises any one or more of:

the anchor point network equipment allocates a cell radio network temporary identifier C-RNTI for the terminal;

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.

6. The method of any of claims 1-5, wherein the direct communication interface connection between the source relay device and the terminal comprises one or more of:

a PC5-S connection between the source relay device and the terminal;

a PC5-RRC connection between the source relay device and the terminal.

7. A method for recovering Radio Resource Control (RRC) connection of a terminal, the method comprising:

8. The method of claim 7, wherein a precondition for the anchor network device to send the indication information to the source relay device is any one of:

the terminal initiates RRC connection recovery by using indirect connection under target network equipment, and target relay equipment is different from the source relay equipment;

the target network equipment is network equipment which serves the terminal when the terminal initiates RRC connection recovery, and the target relay equipment is relay equipment which serves the terminal when the terminal initiates RRC connection recovery;

9. The method of claim 7, wherein 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.

10. The method of claim 7, wherein the terminal-related configuration information comprises one or more of:

identification information of the terminal.

11. The method of claim 10, wherein the identification information of the terminal comprises any one or more of:

12. The method of claim 7, wherein the direct communication interface connection between the source relay device and the terminal comprises one or more of:

a PC5-S connection between the source relay device and the terminal;

a PC5-RRC connection between the source relay device and the terminal.

13. The method according to any one of claims 7 to 12, wherein before the anchor network device sends the indication information to the source relay device of the terminal, the method further comprises:

the anchor point network equipment receives a terminal context request message sent by target network equipment of the terminal;

the target network device is a network device serving the terminal when the terminal initiates RRC connection recovery.

14. The method of claim 13, further comprising:

the anchor point network device deletes the configuration information of the terminal related to the source relay device under the anchor point network device from the locally stored context/context information of the terminal according to the context request message of the terminal;

and the anchor point network equipment sends the deleted terminal context/context information to the target network equipment through an interface between network equipment.

15. The method of claim 13, further comprising:

and the anchor point network sends the locally stored context information of the terminal to the target network equipment through an interface between network equipment according to the context request message of the terminal.

16. The method according to any one of claims 7 to 12, wherein before the anchor network device sends the indication information to the source relay device of the terminal, the method further comprises:

and the anchor point network equipment receives an RRC connection recovery request message sent by the terminal.

17. The method of claim 16, wherein after the anchor network device receives the RRC connection recovery request message from the terminal, further comprising:

the anchor point network equipment deletes the configuration information of the terminal related to the source relay equipment under the anchor point network equipment from the locally stored context/context information of the terminal;

18. An apparatus for RRC connection recovery for a terminal, comprising a memory, a transceiver, and a processor;

the memory for storing a computer program;

the transceiver is used for transceiving data under the control of the processor;

the processor is used for reading the computer program in the memory and executing the following operations:

receiving indication information from anchor network equipment of the terminal, wherein the indication information is used for indicating source relay equipment of the terminal to release configuration information related to the terminal and/or direct communication interface connection between the source relay equipment and the terminal;

19. The apparatus of claim 18, wherein a precondition for the anchor network device to send the indication information to the source relay device is any one of:

20. The apparatus of claim 18, wherein 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.

21. The apparatus of claim 18, wherein the terminal-related configuration information comprises one or more of:

identification information of the terminal.

22. The apparatus of claim 21, wherein the identification information of the terminal comprises any one or more of:

23. The apparatus of any of claims 18-22, wherein the direct communication interface connection between the source relay device and the terminal comprises one or more of:

a PC5-S connection between the source relay device and the terminal;

a PC5-RRC connection between the source relay device and the terminal.

24. An apparatus for RRC connection recovery for a terminal, the apparatus comprising a memory, a transceiver, and a processor, wherein the apparatus is applied to an anchor network device of the terminal;

the memory for storing a computer program;

25. The apparatus of claim 24, wherein a precondition for the anchor network device to send the indication information to the source relay device is any one of:

26. The apparatus of claim 24, wherein 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.

27. The apparatus of claim 24, wherein the terminal-related configuration information comprises one or more of:

identification information of the terminal.

28. The apparatus of claim 27, wherein the identification information of the terminal comprises any one or more of:

29. The apparatus of claim 24, wherein the direct communication interface connection between the source relay device and the terminal comprises one or more of:

a PC5-S connection between the source relay device and the terminal;

a PC5-RRC connection between the source relay device and the terminal.

30. The apparatus according to any of claims 24-29, wherein the processor is further configured to:

before sending indication information to source relay equipment of the terminal, receiving a terminal context request message sent by target network equipment of the terminal;

31. The apparatus of claim 30, wherein the processor is further configured to:

according to the terminal context request message, deleting configuration information of the terminal related to source relay equipment under the anchor point network equipment from locally stored terminal context/context information;

32. The apparatus of claim 30, wherein the processor is further configured to:

33. The apparatus according to any of claims 24-29, wherein the processor is further configured to:

and receiving an RRC connection recovery request message sent by the terminal before sending the indication information to the source relay equipment of the terminal.

34. The apparatus of claim 33, wherein the processor is further configured to:

after receiving an RRC connection recovery request message from the terminal, deleting configuration information of the terminal related to the source relay equipment under the anchor point network equipment from locally stored context/context information of the terminal;

35. An apparatus for RRC connection recovery for a terminal, comprising:

a receiving unit, configured to receive indication information from an anchor network device of the terminal, where the indication 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;

36. An apparatus for RRC connection recovery for a terminal, wherein the apparatus is applied to an anchor network device of the terminal, and the apparatus comprises:

a sending unit, configured to send indication information to a source relay device of the terminal, where the indication information is used to indicate the source relay device to release configuration information related to the terminal and/or direct communication interface connection between the source relay device and the terminal;

37. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to perform the method of any one of claims 1 to 6 or any one of claims 7 to 17.

38. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the method of any of claims 1 to 6 or any of claims 7 to 17.