Transmission method and device of rrc message, terminal and readable storage medium

Abstract

The application discloses a kind of transmission method and device of RRC message, terminal and readable storage medium, belong to communication technical field, the transmission method of RRC message of the embodiment of the application includes: in the case where first wireless access and backhaul integration IAB node determines to meet preset condition, the first IAB node will be switched to second transmission path by first transmission path in the transmission path of the RRC message transmission;Wherein, the first transmission path is default transmission path;The first IAB node transmits the RRC message to second IAB node by the second transmission path.By the present application, the problem that only RRC message can be transmitted by default through MCG in the prior art is solved.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a method and apparatus for transmitting RRC messages, a terminal, and a readable storage medium. Background Technology

[0002] For split signaling radio bearers (SRBs), the current protocol only supports setting the primary path to the master cell group (MCG) by default. This means that all radio resource control (RRC) messages that need to be sent through the split SRB are sent through the MCG by default, preventing the terminal from switching the path for transmitting RRC messages. Summary of the Invention

[0003] This application provides a method, apparatus, terminal, and readable storage medium for transmitting RRC messages, which can solve the problem that in the prior art, RRC messages can only be transmitted via MCG by default.

[0004] In a first aspect, a method for transmitting RRC messages is provided, comprising: when a first integrated wireless access and backhaul (IAB) node determines that preset conditions are met, the first IAB node switches the transmission path for transmitting the RRC message from a first transmission path to a second transmission path; wherein the first transmission path is the default transmission path; and the first IAB node transmits the RRC message to a second IAB node through the second transmission path.

[0005] Secondly, a method for transmitting Radio Resource Control (RRC) messages is provided, comprising: a second IAB node receiving an RRC message transmitted by a first IAB node; and, when the second IAB node determines that preset conditions are met, the second IAB node switching the transmission path for transmitting the RRC message from a third transmission path to a fourth transmission path; wherein the third transmission path is the default transmission path; and the second IAB node transmitting the RRC message through the fourth transmission path.

[0006] Thirdly, an RRC message transmission device is provided, applied to a first IAB node, comprising: a first switching module, configured to switch the transmission path for transmitting the RRC message from a first transmission path to a second transmission path when a preset condition is met; wherein the first transmission path is the default transmission path; and a first transmission module, configured to transmit the RRC message to a second IAB node through the second transmission path.

[0007] Fourthly, a device for transmitting Radio Resource Control (RRC) messages is provided, applied to a second IAB node, comprising: a receiving module for receiving RRC messages transmitted by a first IAB node; a second switching module for switching the transmission path of the RRC messages from a third transmission path to a fourth transmission path when a preset condition is met; wherein the third transmission path is the default transmission path; and a second transmission module for transmitting the RRC messages through the fourth transmission path.

[0008] Fifthly, a terminal is provided, the terminal including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method as described in the first aspect, or implement the steps of the method as described in the second aspect.

[0009] In a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the processor is configured to switch the transmission path for transmitting the RRC message from a first transmission path to a second transmission path when it is determined that preset conditions are met, and the communication interface is configured to transmit the RRC message to a second IAB node through the second transmission path.

[0010] In a seventh aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect.

[0011] Eighthly, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method as described in the first aspect, or to implement the steps of the method as described in the second aspect.

[0012] In a ninth aspect, a computer program / program product is provided, the computer program / program product being stored in a non-volatile storage medium, the program / program product being executed by at least one processor to implement the steps of the method as described in the first aspect, or to implement the steps of the method as described in the second aspect.

[0013] In this embodiment of the application, under the condition of meeting the preset conditions, the first IAB node switches the transmission path for transmitting RRC messages from the first transmission path to the second transmission path, and then transmits RRC messages to the second IAB node through the second transmission path. This enables the switching from the default transmission path to other paths. If the first transmission path is MCG and the second transmission path is SCG, the switching from MCG to SCG can be realized, which solves the problem in the prior art that RRC messages can only be transmitted through MCG by default. Attached Figure Description

[0014] Figure 1 This is a block diagram of a wireless communication system applicable to the embodiments of the application;

[0015] Figure 2 This is one of the schematic diagrams illustrating the separation transmission in a CP / UP separation scenario according to an embodiment of this application;

[0016] Figure 3 This is a second schematic diagram of a CP / UP separation scenario according to an embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the structure of the IAB system according to an embodiment of this application;

[0018] Figure 5 This is a schematic diagram of the CU-DU structure of the IAB system according to an embodiment of this application;

[0019] Figure 6 This is one of the flowcharts of the RRC message transmission method in this application embodiment;

[0020] Figure 7 This is the second flowchart of the RRC message transmission method according to an embodiment of this application;

[0021] Figure 8 This is one of the structural schematic diagrams of an RRC message transmission device according to an embodiment of this application;

[0022] Figure 9 This is a second schematic diagram of the structure of the RRC message transmission device according to an embodiment of this application;

[0023] Figure 10 This is a schematic diagram of the structure of a communication device according to an embodiment of this application;

[0024] Figure 11 This is a schematic diagram of the terminal structure according to an embodiment of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to applications other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0028] Figure 1This diagram illustrates a block diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as a terminal device or user equipment (UE). The terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), etc. Wearable devices include smartwatches, wristbands, headphones, glasses, etc. It should be noted that this application does not limit the specific type of terminal 11. Network-side device 12 can be a base station or a core network. The base station can be referred to as a node B, evolved node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, WLAN access point, WiFi node, transmitting and receiving point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only the base station in the NR system is used as an example, but the specific type of base station is not limited.

[0029] Furthermore, the relevant terms in the embodiments of this application are explained.

[0030] I. Transmission of SRB

[0031] like Figure 2As shown, in CP / UP separation (control plane and user plane separation) scenario 1, SRB2 transmits F1-C (F1 control plane) related data between the Integrated Access and Backhaul (IAB) Distributed Unit (DU) and the IAB-donor-CU. That is, the F1-C data between IAB-node2 and the secondary node (SN), i.e., the IAB-donor-CU, is transmitted to the main node (MN), i.e., gNB, via the air interface (Uu). Then, the gNB interacts with the SN through the Xn interface to transmit the F1-C data to the SN.

[0032] like Figure 3 As shown, split SRB2 is used for transmission in scenario 2. CP / UP separation describes a scenario where F1-C (F1 control plane) / F1-U (F1 user plane) between the IAB-node and the IAB-donor-CU are transmitted separately via different nodes. Specifically, F1-C data between IAB-node2 and the MN node is transmitted via the air interface (Uu), and then the SN (gNB) interacts with the MN node through the Xn interface to pass F1-C traffic to the MN. Meanwhile, F1-U traffic between IAB-node2 and the MN node is transmitted via the Back Haul (BH) RadioLink Control (RLC) channel in the IAB topology network.

[0033] II. IAB System

[0034] like Figure 4 As shown, an IAB node includes a DU (Dedicated Access Point) functional portion and a Mobile Termination (MT) functional portion. Relying on the MT, an access point (IAB node) can find an upstream access point (parent IAB node) and establish a radio connection with the upstream access point's DU; this radio connection is called a backhaul link. After an IAB node establishes a complete backhaul link, it activates its DU function, and the DU provides cell services, meaning the DU can provide access services to user equipment (UE). A self-backhaul loop includes a donor IAB node (or an IAB donor), which has a directly connected wired transmission network.

[0035] Figure 5This is a schematic diagram of the CU-DU (Centralized Unit-Distributed Unit) structure of an IAB system, such as... Figure 5 As shown, in a self-return loop, all IAB nodes' DUs are connected to a single CU node, which configures the DUs via the F1-AP protocol. The CU configures the MT via the RRC protocol. Donor IAB nodes do not have an MT functionality component.

[0036] The IAB system was introduced to address the issue of inadequate wired transmission network deployment when access points are densely deployed. In other words, access points can rely on wireless backhaul when a wired transmission network is unavailable.

[0037] The wireless link between IAB nodes is called the backhaul link, and the BH link is configured with BHRLC information for wireless backhaul.

[0038] III. Split SRB

[0039] When a Packet Data Convergence Protocol (PDCP) entity is associated with two or more RLC entities, a primary RLC entity is defined to perform the default data transmission. When the total amount of DRB data to be transmitted is less than the ul-DataSplitThreshold (uplink data separation threshold), the primary path is selected for data transmission. If the total amount is greater than or equal to the threshold, any associated RLC entity can be selected for data transmission.

[0040] For split SRBs, the current protocol only supports setting the primary path to MCG by default. Furthermore, the corresponding ul-DataSplitThreshold does not require configuration for the SRB. This means that all RRC messages that need to be sent via split SRBs are sent via MCG by default. Only when PDCP duplication is configured will the RRC message be sent separately via both the MCG and the Secondary Cell Group (SCG).

[0041] The method for transmitting RRC messages provided in this application will be described in detail below with reference to the accompanying drawings, through some embodiments and application scenarios.

[0042] like Figure 6 As shown in the figure, this application embodiment provides a method for transmitting RRC messages, the steps of which include:

[0043] Step 602: If the first IAB node determines that the preset conditions are met, the first IAB node switches the transmission path for transmitting RRC messages from the first transmission path to the second transmission path; wherein, the first transmission path is the default transmission path.

[0044] Step 604: The first IAB node transmits an RRC message to the second IAB node through the second transmission path.

[0045] Through steps 602 and 604 above, under the condition that the preset conditions are met, the first IAB node switches the transmission path for transmitting RRC messages from the first transmission path to the second transmission path, and then transmits RRC messages to the second IAB node through the second transmission path. This enables the switching from the default transmission path to other paths. If the first transmission path is MCG and the second transmission path is SCG, the switching from MCG to SCG can be realized, which solves the problem in the prior art that RRC messages can only be transmitted through MCG by default.

[0046] In an optional embodiment of this application, the first IAB node in this application embodiment may further refer to IAB-MT.

[0047] It should be noted that the preset conditions of the embodiments of this application may include at least one of the following:

[0048] 1) The signaling radio bearer SRB is configured as a split SRB, where the SRB is used to transmit RRC messages;

[0049] 2) The SRB is not configured with PDCP repeat function;

[0050] 3) The default transmission path configured for the SRB corresponds to the primary cell group (MCG);

[0051] 4) A radio link failure (RLF) occurred on the MCG link.

[0052] As can be seen, under the above-mentioned preset conditions, such as when the SRB is not configured with PDCP repeat function, the terminal can also switch the transmission path, thereby achieving the switching of the transmission path and avoiding the inability to transmit RRC messages only through the default transmission path.

[0053] In this embodiment, the Split SRB may include at least one of the following: Split SRB1 and Split SRB2. It should be noted that the SRB refers to the SRB between the MN (Master Node) and the UEs with RLC bearers in the MCG and SCG. SRB1 is used to transmit RRC messages (which may include accompanying NAS messages) and NAS messages before the establishment of SRB2; the entire transmission process uses the DCCH logical channel. SRB2 is used to transmit NAS messages, as well as RRC messages containing measurement information for minimizing drive testing, and information related to F1-C specific to IAB-DU; the entire transmission process uses the DCCH logical channel.

[0054] In the embodiments of this application, the RRC message includes information related to the F1 control plane F1-C. For example, the RRC message can be ULInformationTransfer (uplink information transmission), which carries information such as DedicatedInfoF1c, i.e., F1-C related information.

[0055] Furthermore, the F1-C related information includes F1 Application Protocol (F1AP) information and F1-C related IP packet information; wherein, the F1AP information is encapsulated in at least one of the following: Stream Control Transmission Protocol (SCTP) packets and Internet Protocol (IP) packets. In addition, the F1-C related IP packets are either packets with SCTP encapsulation or packets without SCTP encapsulation.

[0056] In this embodiment of the application, the RRC message is taken as the ULInformationTransfer message. The content of the ULInformationTransfer message is set as follows in this embodiment of the application:

[0057] 1) If F1-C related information needs to be transmitted (only applicable to IAB-MT), add dedicatedInfoF1c information to ULInformationTransfer;

[0058] 2) If SRB2 is configured as a separate SRB and PDCP-Duplication is not configured, and the ULInformationTransfer message includes dedicatedInfoF1c, and the primaryPath of the PDCP entity of SRB2 points to MCG, then set the primary Path to point to SCG.

[0059] 3) Submit the ULInformationTransfer message to the lower layer for transmission.

[0060] It should be noted that the above explanation is from the perspective of the first IAB node side regarding the transmission method of RRC messages in this application embodiment. The following explanation will be from the perspective of the second IAB node side regarding the transmission method of RRC messages in this application embodiment.

[0061] like Figure 7 As shown, a method for transmitting RRC messages is provided, the steps of which include:

[0062] Step 702: The second IAB node receives the RRC message transmitted by the first IAB node;

[0063] Step 704: If the second IAB node determines that the preset conditions are met, the second IAB node switches the transmission path for transmitting RRC messages from the third transmission path to the fourth transmission path; wherein, the third transmission path is the default transmission path.

[0064] Step 706: The second IAB node transmits the RRC message through the fourth transmission path.

[0065] Through steps 702 to 706 above, after the second IAB node receives the RRC message, and under the condition that the preset conditions are met, the second IAB node switches the transmission path for transmitting the RRC message from the third transmission path to the fourth transmission path, and then transmits the RRC message through the fourth transmission path. This enables the switching from the default transmission path to other paths. If the third transmission path is MCG and the fourth transmission path is SCG, the switching from MCG to SCG can be realized, which solves the problem in the prior art that RRC messages can only be transmitted through MCG by default.

[0066] Optionally, the preset conditions in the embodiments of this application include at least one of the following:

[0067] 1) The signaling radio bearer SRB is configured as a split SRB, where the SRB is used to transmit RRC messages;

[0068] 2) The SRB is not configured with PDCP repeat function;

[0069] 3) The default transmission path configured for the SRB corresponds to the primary cell group (MCG);

[0070] 4) A radio link failure (RLF) occurred on the MCG link.

[0071] As can be seen, under the above-mentioned preset conditions, such as when the SRB is not configured with PDCP repeat function, the terminal can also switch the transmission path, thereby achieving the switching of the transmission path and avoiding the inability to transmit RRC messages only through the default transmission path.

[0072] It should be noted that the second IAB node in this embodiment is preferably a CU node.

[0073] It should be noted that the execution entity of the RRC message transmission method provided in this application embodiment can be an RRC message transmission device, or a control module in the RRC message transmission device for executing the RRC message transmission method. This application embodiment uses the execution of the RRC message transmission method by an RRC message transmission device as an example to illustrate the RRC message transmission device provided in this application embodiment.

[0074] like Figure 8 As shown, this application embodiment provides an RRC message transmission apparatus, which is applied to a first IAB node, and the apparatus includes:

[0075] The first switching module 82 is used to switch the transmission path for transmitting RRC messages from the first transmission path to the second transmission path when it is determined that preset conditions are met; wherein, the first transmission path is the default transmission path.

[0076] The first transmission module 84 is used to transmit RRC messages to the second IAB node through the second transmission path.

[0077] The device in this application embodiment can switch the transmission path of RRC messages from the first transmission path to the second transmission path when the preset conditions are met, and then transmit the RRC messages through the second transmission path. This can realize the switching from the default transmission path to other paths. If the first transmission path is MCG and the second transmission path is SCG, the switching from MCG to SCG can be realized, which solves the problem that in the prior art, RRC messages can only be transmitted through MCG by default.

[0078] Optionally, the pre-defined conditions in the implementation of this application may include at least one of the following:

[0079] 1) The signaling radio bearer SRB is configured as a split SRB, where the SRB is used to transmit RRC messages;

[0080] 2) The SRB is not configured with the Packet Data Convergence Protocol (PDCP) repeat function;

[0081] 3) The default transmission path configured for the SRB corresponds to the primary cell group (MCG);

[0082] 4) A radio link failure (RLF) occurred on the MCG link.

[0083] Optionally, the Split SRB in the embodiments of this application includes at least one of the following: Split SRB1 and SplitSRB2.

[0084] Optionally, the RRC message in this embodiment includes information related to the F1 control plane F1-C.

[0085] Optionally, the information related to F1-C includes F1 Application Protocol (F1AP) information and F1-C related IP packet information. The F1AP information is encapsulated in at least one of the following: Flow Control Transmission Protocol (SCTP) packets and Internet Protocol (IP) packets. The F1-C related IP packets are either packets with SCTP encapsulation or packets without SCTP encapsulation.

[0086] It should be noted that the above explanation describes the RRC message transmission method in this application embodiment from the perspective of the device applied to the first IAB node side. The following explanation describes the RRC message transmission method in this application embodiment from the perspective of the device applied to the second IAB node side.

[0087] like Figure 9 As shown, an RRC message transmission device is provided, applied to a second IAB node, the device comprising:

[0088] Receiver module 92 is used to receive RRC messages transmitted by the first IAB node;

[0089] The second switching module 94 is used to switch the transmission path of the RRC message from the third transmission path to the fourth transmission path when it is determined that the preset conditions are met; wherein the third transmission path is the default transmission path.

[0090] The second transmission module 96 is used to transmit RRC messages through the fourth transmission path.

[0091] With the apparatus described in the above embodiments of this application, after receiving an RRC message and under the condition that preset conditions are met, the transmission path for transmitting the RRC message can be switched from the third transmission path to the fourth transmission path, and then the RRC message can be transmitted through the fourth transmission path. This enables the switching from the default transmission path to other paths. If the third transmission path is MCG and the fourth transmission path is SCG, the switching from MCG to SCG can be achieved, solving the problem in the prior art that RRC messages can only be transmitted through MCG by default.

[0092] Optionally, the preset conditions in the embodiments of this application include at least one of the following:

[0093] The signaling radio bearer SRB is configured as a split SRB, where the SRB is used to transmit RRC messages;

[0094] SRB is not configured with Packet Data Convergence Protocol (PDCP) repeat functionality;

[0095] The default transmission path configured by the SRB corresponds to the primary cell group (MCG).

[0096] A radio link failure (RLF) occurred on the MCG link.

[0097] The RRC message transmission device in this application embodiment can be a device, a device or electronic device with an operating system, or a component, integrated circuit, or chip in a terminal. The device or electronic device can be a mobile terminal or a non-mobile terminal. For example, a mobile terminal can include, but is not limited to, the types of terminal 11 listed above, while a non-mobile terminal can be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the type of terminal.

[0098] The RRC message transmission device provided in this application embodiment can achieve Figure 6 and Figure 7 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0099] Optional, such as Figure 10 As shown, this application embodiment also provides a communication device 1000, including a processor 1001, a memory 1002, and a program or instructions stored in the memory 1002 and executable on the processor 1001. For example, when the communication device 1000 is a terminal, the program or instructions executed by the processor 1001 implement the various processes of the above-described RRC message transmission method embodiment, and achieve the same technical effect. When the communication device 1000 is a network-side device, the program or instructions executed by the processor 1001 implement the various processes of the above-described RRC message transmission method embodiment, and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0100] This application embodiment also provides a terminal, including a processor and a communication interface. The processor is used to switch the transmission path for transmitting the RRC message from a first transmission path to a second transmission path when it is determined that preset conditions are met; wherein, the first transmission path is the default transmission path; the communication interface is used to transmit the RRC message to a second IAB node through the second transmission path. This terminal embodiment corresponds to the above-described terminal-side method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 11 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0101] The terminal 1100 includes, but is not limited to, at least some of the following components: radio frequency unit 1101, network module 1102, audio output unit 1103, input unit 1104, sensor 1105, display unit 1106, user input unit 1107, interface unit 1108, memory 1109, and processor 1110.

[0102] Those skilled in the art will understand that the terminal 1100 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 1110 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 11 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0103] It should be understood that, in this embodiment, the input unit 1104 may include a graphics processing unit (GPU) 11041 and a microphone 11042. The GPU 11041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 1106 may include a display panel 11061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 1107 includes a touch panel 11071 and other input devices 11072. The touch panel 11071 is also called a touch screen. The touch panel 11071 may include a touch detection device and a touch controller. Other input devices 11072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0104] In this embodiment, the radio frequency unit 1101 receives downlink data from the network-side device and processes it for the processor 1110; additionally, it sends uplink data to the network-side device. Typically, the radio frequency unit 1101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0105] The memory 1109 can be used to store software programs or instructions and various data. The memory 1109 may primarily include a program or instruction storage area and a data storage area. The program or instruction storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 1109 may include high-speed random access memory and non-volatile memory, wherein the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0106] Processor 1110 may include one or more processing units; optionally, processor 1110 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications or instructions, and the modem processor mainly handles wireless communication, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 1110.

[0107] The processor 1110 is configured to switch the transmission path for transmitting the RRC message from a first transmission path to a second transmission path when a preset condition is met; wherein the first transmission path is the default transmission path.

[0108] Radio frequency unit 1101 is used to transmit the RRC message to the second IAB node through the second transmission path;

[0109] The terminal in this application embodiment can switch the transmission path of RRC messages from the first transmission path to the second transmission path when the preset conditions are met. Then, the RRC messages are transmitted to the second IAB node through the second transmission path. This can realize the switching from the default transmission path to other paths. If the first transmission path is MCG and the second transmission path is SCG, the switching from MCG to SCG can be realized, which solves the problem that the prior art can only transmit RRC messages through MCG by default.

[0110] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described RRC message transmission method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0111] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0112] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described RRC message transmission method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0113] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0114] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0115] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0116] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for transmitting Radio Resource Control (RRC) messages, characterized in that, include: When the first IAB (Integrated Access and Backhaul) node determines that preset conditions are met, the first IAB node switches the transmission path for transmitting the RRC message from the first transmission path to the second transmission path; wherein, the first transmission path is the default transmission path; the preset conditions include: the signaling radio bearer (SRB) is configured as a split SRB, and a radio link failure (RLF) occurs on the MCG link; the SRB is not configured with Packet Data Convergence Protocol (PDCP) duplication function; the default transmission path configured for the SRB corresponds to the primary cell group (MCG); wherein, the SRB is used to transmit the RRC message; The first IAB node transmits the RRC message to the second IAB node through the second transmission path.

2. The method according to claim 1, characterized in that, The Split SRB includes at least one of the following: SplitSRB1 and Split SRB2.

3. The method according to claim 1, characterized in that, The RRC message includes information related to the F1 control plane F1-C.

4. The method according to claim 3, characterized in that, The information related to F1-C includes F1 Application Protocol (F1AP) information and F1-C related IP packet information; The F1AP information is encapsulated in at least one of the following: Flow Control Transmission Protocol (SCTP) packets, Internet Protocol (IP) packets; The F1-C related IP packets are either packets with SCTP encapsulation or packets without SCTP encapsulation.

5. A method for transmitting Radio Resource Control (RRC) messages, characterized in that, include: The second IAB node receives the RRC message transmitted by the first IAB node; When the second IAB node determines that preset conditions are met, the second IAB node switches the transmission path for transmitting the RRC message from the third transmission path to the fourth transmission path; wherein, the third transmission path is the default transmission path; the preset conditions include: the signaling radio bearer SRB is configured as a split SRB, and a radio link failure (RLF) occurs on the MCG link; the SRB is not configured with Packet Data Convergence Protocol (PDCP) duplicate function; the default transmission path configured for the SRB corresponds to the primary cell group (MCG); wherein, the SRB is used to transmit the RRC message; The second IAB node transmits the RRC message through the fourth transmission path.

6. An RRC message transmission device, applied to a first IAB node, characterized in that, include: A first switching module is used to switch the transmission path for transmitting the RRC message from a first transmission path to a second transmission path when preset conditions are met; wherein, the first transmission path is the default transmission path; the preset conditions include: the signaling radio bearer (SRB) is configured as a split SRB, and a radio link failure (RLF) occurs on the MCG link; the SRB is not configured with Packet Data Convergence Protocol (PDCP) duplication function; the default transmission path configured for the SRB corresponds to the primary cell group (MCG); wherein, the SRB is used to transmit the RRC message; The second transmission module is used to transmit the RRC message to the second IAB node through the second transmission path.

7. The apparatus according to claim 6, characterized in that, The Split SRB includes at least one of the following: SplitSRB1 and Split SRB2.

8. The apparatus according to claim 6, characterized in that, The RRC message includes information related to the F1 control plane F1-C.

9. The apparatus according to claim 8, characterized in that, The information related to F1-C includes F1 Application Protocol (F1AP) information and F1-C related IP packet information; The F1AP information is encapsulated in at least one of the following: Flow Control Transmission Protocol (SCTP) packets, Internet Protocol (IP) packets; The F1-C related IP packets are either packets with SCTP encapsulation or packets without SCTP encapsulation.

10. A device for transmitting Radio Resource Control (RRC) messages, applied to a second IAB node, characterized in that, include: The receiving module is used to receive RRC messages transmitted by the first IAB node; The second handover module is used to switch the transmission path for transmitting the RRC message from the third transmission path to the fourth transmission path when preset conditions are met; wherein the third transmission path is the default transmission path; the preset conditions include: the signaling radio bearer (SRB) is configured as a split SRB, and a radio link failure (RLF) occurs on the MCG link; the SRB is not configured with Packet Data Convergence Protocol (PDCP) duplication function; the default transmission path configured for the SRB corresponds to the primary cell group (MCG); wherein the SRB is used to transmit the RRC message; The second transmission module is used to transmit the RRC message through the fourth transmission path.

11. A system for transmitting Radio Resource Control (RRC) messages, characterized in that, include: The apparatus according to any one of claims 6 to 9, and the apparatus according to claim 10.

12. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein when the program or instructions are executed by the processor, they implement the method steps as claimed in any one of claims 1 to 4, or implement the method steps as claimed in claim 5.

13. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the method steps as described in any one of claims 1 to 4, or implement the method steps as described in claim 5.

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