CN117998486A

CN117998486A - Communication method and device

Info

Publication number: CN117998486A
Application number: CN202211379172.5A
Authority: CN
Inventors: 王凡凡; 耿婷婷; 陈君; 胡星星
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2024-05-07
Also published as: WO2024093931A1

Abstract

The application provides a communication method and a communication device. The method comprises the following steps: when the terminal equipment fails in a wireless link with the master node, the terminal equipment sends master cell group failure information to the master node through the auxiliary node, wherein the master cell group failure information is used for requesting to execute quick master cell group link recovery; in a first time after the failure information of the primary cell group is sent, the terminal equipment receives a first message from the primary node through the secondary node, wherein the first message comprises a switching message or a radio resource control release message; under the condition that the triggering condition is met, the terminal equipment records a first report, wherein the first report indicates relevant information in the process of executing the fast primary cell group link recovery; the terminal device sends a first report to the primary node or the secondary node. By the method, the network equipment can analyze the potential failure reasons of the quick main cell group link recovery process according to the first report, so that mobility parameter optimization is performed, the probability of failure in executing the quick main cell group link recovery is reduced, and the communication quality is improved.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

When a radio link failure (radio link failure, RLF) occurs between the terminal device and the primary node, a fast primary cell group link recovery (FAST MCG LINK recovery) procedure is proposed to avoid long-time data interruption caused by the terminal device performing radio resource control (Radio Resource Control, RRC) reestablishment. FAST MCG LINK recovery flow means that when the terminal device detects that RLF occurs between the terminal device and the master node, the terminal device can recover the RRC connection with the master node by performing signaling interaction between the auxiliary node and the master node.

However, even if the FAST MCG LINK recovery procedure is successfully executed, there may be a potential problem of failure, for example, in the current FAST MCG LINK recovery procedure, although the FAST MCG LINK recovery procedure is successfully executed, there is a possibility of RLF between the terminal device and the auxiliary node, and then, when the terminal device performs FAST MCG LINK recovery procedure again in this case, if RLF occurs between the terminal device and the auxiliary node, the terminal device cannot perform signaling interaction between the auxiliary node and the main node, which results in a failure of FAST MCG LINK recovery procedure execution.

Therefore, the problem of how to reduce the uncertainty caused by successful execution of the FAST MCG LINK recovery flow and the problem of improving the probability of success of the FAST MCG LINK recovery flow are needed to be solved.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which are beneficial to improving the success probability of FAST MCG LINK recovery flow.

In a first aspect, an embodiment of the present application provides a communication method, which may be applied to a terminal device (e.g., a device or a chip of the terminal device). In the method, when RLF occurs between a terminal device and a main node, the terminal device sends failure information of a main cell group to the main node through an auxiliary node; the primary cell group failure information is used for requesting to execute quick primary cell group link recovery; in a first time after the moment of sending the failure information of the primary cell group, the terminal equipment receives a first message from the secondary node through the secondary node; wherein the first message comprises a handover message or an RRC release message; under the condition that the triggering condition is met, the terminal equipment records a first report; the first report is used for indicating relevant information in the process of executing FAST MCG LINK recovery; further, the terminal device sends the first report to the primary node and/or the secondary node.

Based on the method described in the first aspect, under the trigger condition that FAST MCG LINK recovery is successful and the first report is recorded, the terminal device records and reports relevant information in the FAST MCG LINK recovery process, so that the network device (the primary node and/or the secondary node) can optimize FAST MCG LINK recovery configuration (such as timer configuration and secondary cell group mobility parameter configuration) and the like according to the relevant information in the FAST MCG LINK recovery process, thereby improving the success probability of the FAST MCG LINK recovery process and reducing the transmission recovery delay of the primary cell group. The mobility parameter is a parameter that may be used in determining a handover procedure, such as a signal threshold of the handover.

In an alternative embodiment, the terminal device receives a configuration message from the master node, where the configuration message is used to record the first report if FAST MCG LINK recovery is successful and the trigger condition is met; wherein the configuration message includes a trigger condition. By implementing the alternative embodiment, the terminal device records the first report only when FAST MCG LINK recovery is successful and the triggering condition is met under the condition that the configuration message from the main node is received, so that the flexibility of recording the first report is improved.

In an alternative embodiment, the first report includes one or more of the following information: the operation time of the first timer, the identification information of the primary and secondary cells, the triggering condition indication information of the first report, the measurement information of the secondary cell group and the information of the terminal equipment random access secondary node; the running duration of the first timer is the duration between the moment when the terminal equipment sends the failure information of the main cell group and the moment when the terminal equipment receives the first message.

In an alternative embodiment, the information of the terminal device random access auxiliary node includes one or more of the following: the method comprises one or more of cell identification information of random access, frequency point information of random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for performing random access attempt, data amount to be transmitted of two-step random access, and Physical Uplink SHARED CHANNEL (PUSCH) configuration information of two-step random access.

In an alternative embodiment, the trigger condition includes one or more of the following:

The running duration of the first timer is smaller than a first threshold value and larger than or equal to a second threshold value, and the running duration of the first timer is the duration between the moment when the terminal equipment sends the failure information of the main cell group to the moment when the terminal equipment receives the first message; the second threshold value is the product of the first threshold value and a first coefficient, and the first coefficient is a positive number smaller than 1; or the second threshold value is a value smaller than the first threshold value;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the main node, and the running duration of the second timer corresponding to the auxiliary node is smaller than a third threshold value and larger than or equal to a fourth threshold value; the operation duration of the second timer is as follows: the time length from the detection of the physical layer out-of-step problem with the auxiliary node by the terminal equipment to the detection of the recovery of the wireless link between the terminal equipment and the auxiliary node; the fourth threshold value is the product of the third threshold value and a second coefficient, and the second coefficient is a positive number smaller than 1; or the fourth threshold value is a value smaller than the third threshold value;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the main node, the running duration of the third timer corresponding to the auxiliary node is smaller than a fifth threshold value and larger than or equal to a sixth threshold value, and the running duration of the third timer is as follows: during the operation period of the second timer, the terminal equipment triggers a measurement report to the time length between the detection of the wireless link recovery between the terminal equipment and the auxiliary node; the sixth threshold value is the product of the fifth threshold value and a third coefficient, and the third coefficient is a positive number smaller than 1; or the sixth threshold is a value less than the fifth threshold;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the main node, and the transmission times of the random access message between the terminal equipment and the auxiliary node are smaller than a seventh threshold value and larger than or equal to an eighth threshold value; wherein the eighth threshold value is the product of the seventh threshold value and a fourth coefficient, and the fourth coefficient is a positive number smaller than 1; or the eighth threshold value is smaller than the seventh threshold value;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the main node, and the terminal equipment detects the indication information of the radio link control layer from the auxiliary node, wherein the indication information is used for indicating that the repeated transmission times occurring in the radio link control layer is smaller than a ninth threshold value and larger than or equal to a tenth threshold value; wherein the tenth threshold value is the product of the ninth threshold value and a fifth coefficient, and the fifth coefficient is a positive number smaller than 1; or the tenth threshold value is smaller than the ninth threshold value;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the main node, and the continuous failure times of executing uplink listen before talk (Listen Before Talk, LBT) on the auxiliary node is smaller than an eleventh threshold value and larger than or equal to a twelfth threshold value; wherein the twelfth threshold value is the product of the eleventh threshold value and a sixth coefficient, and the sixth coefficient is a positive number smaller than 1; or the twelfth threshold value is less than the eleventh threshold value.

In an alternative embodiment, the first report further comprises one or more of the following information: the operation time of the second timer, the operation time of the third timer, the number of random access message transmissions between the terminal device and the auxiliary node, the number of repeated transmissions occurring at the auxiliary node radio link control layer, and the number of continuous failures to perform LBT on the auxiliary node.

In an alternative embodiment, the terminal device records RLF reports when RLF occurs between the terminal device and the master node; and if the terminal equipment receives the first message from the auxiliary node in the first time after the moment of sending the failure information of the main cell group, the terminal equipment releases the RLF report.

In an alternative embodiment, the primary cell group failure information includes one or more of the following: information of a first cell, wherein the first cell is a main cell in which the terminal equipment detects that RLF occurs; information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment; cause indication information of RLF failure; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; second time information for indicating a duration between a time of a last conditional switch command received by the terminal device and a time of the RLF; the terminal equipment randomly accesses the information of the main node; the first indication information is used for indicating a first candidate cell for the conditional switching configured by the terminal equipment, wherein the main node measured by the terminal equipment is used for indicating the terminal equipment to configure when the terminal equipment is stopped to RLF; and/or, a handover trigger condition of the first candidate cell; and second indication information for indicating a second candidate cell measured by the terminal device other than the first candidate cell. By implementing the alternative implementation mode, the failure information of the main cell group is enhanced, so that the main node can acquire complete RLF information of the main cell group under the condition that FAST MCG LINK recovery is successful, and the main node can optimize mobility parameters related to the main cell group according to the RLF information of the main cell group, thereby reducing the probability of RLF occurrence of the main cell group and reducing the service interruption time of the main cell group.

In an alternative embodiment, the information that the terminal device randomly accesses to the master node includes one or more of the following: the method comprises the steps of random access cell identification information, random access frequency point information, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for random access attempt, two-step random access to-be-transmitted data amount or two-step random access PUSCH configuration information.

In a second aspect, the present application also provides a communication processing method, which corresponds to the communication method of the first aspect, which is explained from the master node side (applicable to a device or a chip of the master node). In the method, a master node receives master cell group failure information from terminal equipment through an auxiliary node; the primary cell group failure information is used for requesting execution FAST MCG LINK recovery; the main node sends a first message to the terminal equipment through the auxiliary node; wherein the first message comprises a handover message or an RRC release message; in case the terminal device satisfies the trigger condition, the master node receives a first report from the terminal device, the first report being used for indicating relevant information in executing FAST MCG LINK recovery procedure.

The advantages of the method according to the second aspect can be seen from the advantages of the method according to the first aspect, and will not be described in detail.

In an alternative implementation manner, the master node sends a configuration message to the terminal device, where the configuration message is used to record a first report when FAST MCG LINK recovery is successful and the trigger condition is satisfied; wherein the configuration message includes a trigger condition.

In the method provided in the second aspect, the content of the first report may be referred to in the first aspect as an implementation manner of the first report; for content on the trigger condition, see the implementation manner of the trigger condition in the first aspect; for content regarding primary cell group failure information see embodiments of the primary cell group failure information in the first aspect; and will not be described in detail herein.

In a third aspect, the present application also provides a communication processing method of the aspect corresponding to the communication methods of the first and second aspects, the communication method of the aspect being set forth from the secondary node side (applicable to a device or a chip of the secondary node). In the method, an auxiliary node receives failure information of a main cell group from terminal equipment and sends the failure information of the main cell group to the main node; the primary cell group failure information is used for requesting execution FAST MCG LINK recovery; the auxiliary node receives a first message from the main node and sends the first message to the terminal equipment; wherein the first message comprises a handover message or an RRC release message; in case the terminal device satisfies the trigger condition, the secondary node receives a first report from the terminal device, the first report being used for indicating relevant information in executing FAST MCG LINK recovery procedure.

The advantages of the method according to the third aspect can be seen in the advantages of the method according to the first aspect, and will not be described in detail.

In the method provided in the third aspect, the content of the first report may be referred to in the first aspect as an implementation manner of the first report; for content on the trigger condition, see the implementation manner of the trigger condition in the first aspect; for content regarding primary cell group failure information see embodiments of the primary cell group failure information in the first aspect; and will not be described in detail herein.

In a fourth aspect, an embodiment of the present application provides a communication method, which may be applied to a terminal device (e.g., a device or a chip of the terminal device). In the method, when RLF occurs between a terminal device and a master node, the terminal device determines failure information of a master cell group; and sending the failure information of the primary cell group to the primary node through the secondary node; wherein the primary cell group failure information includes one or more of the following information: information of a first cell, wherein the first cell is a main cell in which the terminal equipment detects that RLF occurs; information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment; cause indication information of RLF; first time information; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; second time information for indicating a duration between a time of a last conditional switch command received by the terminal device and a time of the RLF; the terminal equipment randomly accesses the information of the main node; the first indication information is used for indicating whether the cell measured by the terminal equipment is a first candidate cell for conditional switching configured by the main node for the terminal equipment or not when the RLF is performed; and/or, a handover trigger condition of the first candidate cell; and second indication information for indicating the second candidate cell measured by the terminal device except the first candidate cell in the first indication information.

By implementing the alternative implementation mode, the failure information of the main cell group is enhanced, so that the main node can acquire complete RLF information of the main cell group under the condition that FAST MCG LINK recovery is successful, and the main node can optimize mobility parameters of the main cell group according to the RLF information of the main cell group, thereby reducing the probability of occurrence of RLF of the main cell group and reducing service interruption time of the main cell group.

In an alternative embodiment, when RLF occurs between the terminal device and the master node, the terminal device records an RLF report; if the terminal equipment receives a first message from the auxiliary node in a first time after the moment of sending the failure information of the main cell group, releasing the RFL report; wherein the first message comprises a handover message or an RRC release message.

In a fifth aspect, an embodiment of the present application further provides a communication processing method, where the communication method corresponds to the communication method of the third aspect, and the communication method of the third aspect is set forth from the master node side (applicable to a device or a chip of the master node). In the method, when RLF occurs between terminal equipment and a main node, the main node receives failure information of a main cell group from the terminal equipment through an auxiliary node; wherein the primary cell group failure information includes one or more of the following information: information of a first cell, wherein the first cell is a main cell in which the terminal equipment detects that RLF occurs; information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment; cause indication information of RLF failure; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; second time information for indicating a duration between a time of a last conditional switch command received by the terminal device and a time of the RLF; the terminal equipment randomly accesses the information of the main node; the first indication information is used for indicating a first candidate cell for the conditional switching configured by the terminal equipment, wherein the main node measured by the terminal equipment is used for indicating the terminal equipment to configure when the terminal equipment is stopped to RLF; and/or, when the measured cell is a first candidate cell, a handover trigger condition of the first candidate cell; and second indication information for indicating a second candidate cell measured by the terminal device other than the first candidate cell.

Advantageous effects based on the method provided in the fifth aspect may be referred to as advantageous effects of the method provided in the fourth aspect, and will not be described in detail herein.

In a sixth aspect, an embodiment of the present application further provides a communication processing method, where the communication method corresponds to the communication methods of the fourth and fifth aspects, and the communication method of the aspect is set forth from the secondary node side (applicable to a device or a chip of the secondary node). In the method, when RLF occurs between terminal equipment and a main node, an auxiliary node receives main cell group failure information from the terminal equipment and sends the main cell group failure information to the main node; wherein the primary cell group failure information includes one or more of the following information: information of a first cell, wherein the first cell is a main cell corresponding to a main node; information of a second cell, wherein the second cell is a source main cell in a last switching command received by the terminal equipment before RLF; first time information; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; the terminal equipment randomly accesses the information of the main node; the first indication information is used for indicating whether the cell measured by the terminal equipment is a first candidate cell for conditional switching configured by the main node for the terminal equipment or not when the RLF is performed; and/or a handover trigger condition of the first candidate cell.

Advantageous effects based on the method provided in the sixth aspect may be referred to as advantageous effects of the method provided in the fourth aspect, and will not be described in detail here.

In a seventh aspect, the present application provides a communication device, which may be a device in a terminal device, or a device that can be used in a matching manner with a terminal device. The communication device may also be a chip or a chip system. The communication device may perform the method of the first or third aspect. The functions of the communication device can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. The unit may be software and/or hardware. The operations and advantages performed by the communication device may be referred to the methods and advantages described in the first aspect or the fourth aspect, and the repetition is omitted.

In an eighth aspect, the present application provides a communications device, which may be a device in a host node or a device capable of being used in cooperation with a host node. The communication device may also be a chip system. The communication device may perform the method of the second or fourth aspect. The functions of the communication device can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. The unit may be software and/or hardware. The operations and advantages performed by the communication device may be referred to the methods and advantages described in the second or fifth aspect, and the repetition is omitted.

In a ninth aspect, the present application provides a communications apparatus, which may be an apparatus in a secondary node or an apparatus capable of being used in cooperation with a secondary node. The communication device may also be a chip system. The communication device may perform the method of the fifth aspect. The functions of the communication device can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. The unit may be software and/or hardware. The operations and advantages performed by the communication device may be referred to the methods and advantages described in the third aspect or the sixth aspect, and the repetition is omitted.

In a tenth aspect, the present application provides a computer-readable storage medium for storing computer-executable instructions that, when executed, cause a method performed by a terminal device in a method according to the first or fourth aspect to be implemented; or causing the method performed by the master node in the method according to the second or fifth aspect to be implemented; or cause the method performed by the secondary node in the method according to the third or sixth aspect.

In an eleventh aspect, the present application provides a computer program product comprising a computer program which, when executed, causes a method performed by a terminal device in a method according to the first or fourth aspect to be carried out; or causing the method performed by the master node in the method according to the second or fifth aspect to be implemented; or cause the method performed by the secondary node in the method according to the third or sixth aspect.

In a twelfth aspect, the present application provides a communication system, where the communication system includes a device corresponding to a secondary node and a device corresponding to a primary node. Or the communication system may further comprise a communication device corresponding to the terminal device.

Drawings

FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another network device according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a CHO process according to an embodiment of the present application;

Fig. 5 is a schematic diagram of an architecture of each cell in MR-DC according to an embodiment of the present application;

Fig. 6 is a schematic flow chart of a fast primary cell group link recovery according to an embodiment of the present application;

Fig. 7 is a schematic flow chart of a communication method according to an embodiment of the present application;

FIG. 8a is a flow chart of another communication method according to an embodiment of the present application;

FIG. 8b is a flow chart of another communication method according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

Specific embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The terms first and second and the like in the description, in the claims and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the present application, "at least one (item)" means one or more, "a plurality" means two or more, "at least two (items)" means two or three and more, "and/or" for describing an association relationship of an association object, and three kinds of relationships may exist, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

For a better understanding of the embodiments of the present application, the following first describes a system architecture related to the embodiments of the present application:

The embodiment of the application can be applied to a 5G later evolution communication system, a satellite communication system, a short-distance wireless communication system and the like, such as a long-term evolution (long term evolution, LTE) system, a fifth generation mobile communication (5th generation mobile communication,5G) system, a sixth generation mobile communication (6th generation mobile communication,6G) system and the like. Among the wireless communication systems mentioned in the embodiments of the present application include, but are not limited to: narrowband Internet of things (NB-internet of things) and 5G/6G mobile communication systems: enhanced mobile broadband (enhanced mobile broadband, eMBB), ultra-reliable low-latency communications (ultra reliable low latency communication, URLLC), and mass machine-like communications (MASSIVE MACHINE TYPE of communications, mMTC), wireless fidelity (WIRELESS FIDELITY, wiFi) systems.

A wireless communication system may include one or more network devices and one or more terminal devices. Wireless communication systems may also perform point-to-point communications, such as communication between multiple end devices. An exemplary explanation follows with respect to the system architecture shown in fig. 1. In the system architecture shown in fig. 1, comprising 2 network devices (i.e. network device 1 and network device 2) and 1 terminal device (i.e. terminal device 1), the terminal device 1 can communicate with both network device 1 and network device 2. The terminal device and the network device related to the system architecture in fig. 1 are described in detail below.

1. Terminal equipment

The terminal device comprises a device providing voice and/or data connectivity to the user, e.g. the terminal device is a device with wireless transceiving functionality. The terminal device may be deployed on land, including indoors or outdoors, hand-held, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). The terminal device may be a mobile phone, a tablet (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in industrial control (industrial control), a vehicle-mounted terminal, a wireless terminal in unmanned (SELF DRIVING), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (SMART GRID), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (SMART CITY), a wireless terminal in smart home (smart home), a wearable terminal, or the like. The embodiment of the application does not limit the application scene. The terminal device may also be sometimes referred to as a terminal, user Equipment (UE), access terminal, vehicle-mounted terminal, industrial control terminal, mobile station, remote terminal, mobile device, wireless communication device, etc. The terminal device may also be fixed or mobile. It will be appreciated that all or part of the functionality of the terminal device in the present application may also be implemented by software functions running on hardware or by virtualized functions instantiated on a platform, such as a cloud platform.

2. Network equipment

In the embodiment of the application, the network equipment is equipment with a wireless receiving and transmitting function and is used for communicating with the terminal equipment. For example, the network device is a radio access network (radio access network, RAN) node that accesses the terminal device to the wireless network. RAN nodes include, but are not limited to: gNB, transmission and reception point (transmission reception point, TRP), evolved Node B (eNB), radio network controller (radio network controller, RNC), node B (Node B, NB), base station controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), baseband unit (BBU), or wireless fidelity (WIRELESS FIDELITY, wifi) Access Point (AP), access backhaul (INTEGRATED ACCESS AND backhaul, IAB), and so forth.

In one network architecture, a network device may include a centralized unit (centralized unit, CU) and/or include a Distributed Unit (DU).

In one network architecture, as shown in FIG. 2, a network device includes a CU and a DU. Among them, CUs can be divided into control plane (control plane) and user plane (user plane), i.e. CUs include CU-CP and CU-UP. Among them, CU-CP is responsible for control plane functions, mainly including RRC layer and packet data convergence protocol-control plane (PACKET DATA convergence protocol control plane, PDCP-C) layer functions. The PDCP-C is mainly responsible for encryption and decryption of control plane data, integrity protection, data transmission and the like. The CU-UP is responsible for user plane functions, mainly including a service data adaptation protocol (SERVICE DATA adaptation protocol, SDAP) layer and a packet data convergence protocol-user plane (PACKET DATA convergence protocol user plane, PDCP-U) function. The SDAP is mainly responsible for processing data of the core network and mapping the data to the bearer. The PDCP-U is mainly responsible for encryption and decryption of a data surface, integrity protection, header compression, sequence number maintenance, data transmission and the like. In addition, the CU-CP and the CU-UP are connected through an E1 interface, the CU-CP is connected through an F1-C interface and the DU, and the CU-UP is connected through an F1-U interface and the DU. Yet another possible implementation is that the PDCP-C is also in the CU-UP. The DU includes radio link control (radio link control, RLC) layer, medium Access Control (MAC) layer, and Physical (PHY) layer functions.

In another network architecture, as shown in fig. 3, a network device includes a CU and two DUs. Wherein, the CU includes RRC layer, SDAP layer and PDCP layer functions, and the DU includes RLC layer, MAC layer and PHY layer functions. The CUs are each connected to two DUs through an F1 interface.

The network device can perform communication interaction with the core network device, and provide communication services for the terminal device. The core network device is, for example, a device in a 5G Core Network (CN). The core network is used as a bearing network to provide an interface to the data network, and provides communication connection, authentication, management, policy control, bearing of data service and the like for the terminal.

It should be noted that the number of terminal devices and network devices in the system architecture shown in fig. 1 is only schematic and is not considered to be a specific limitation of the technical solution of the present application.

In order to facilitate understanding of the content of the present solution, the following description will explain some terms related to the embodiments of the present application to facilitate understanding by those skilled in the art, and this section is only for convenience of understanding and is not to be construed as a specific limitation of the present application.

1. Conditional switch (conditional handover, CHO).

CHO mechanism: when the source link signal quality with the terminal equipment is good, the source base station sends CHO configuration information to the terminal equipment, wherein the CHO configuration information comprises one or more pieces of information of candidate cells, such as global cell identifiers (cell global identifier, CGI) of the candidate cells and CHO trigger conditions corresponding to each candidate cell; or physical cell identity (PHYSICAL CELL IDENTIFIER, PCI) of one or more candidate cells and frequency information corresponding to each candidate cell. Further, after receiving CHO configuration information configured by a source base station, the terminal device determines whether cell quality of candidate cells configured in the CHO configuration information meets CHO trigger conditions, takes a cell meeting the CHO trigger conditions as a target handover cell, and initiates a Random Access Channel (RACH) ACCESS CHANNEL to the target handover cell. And when the terminal equipment is successfully accessed into the target switching cell at random, the terminal equipment sends a CHO completion message to a base station (namely a target base station) to which the target switching cell belongs so as to inform the target base station of completing CHO with the target base station.

By way of example, fig. 4 is a process of CHO for a terminal device. As shown in fig. 4, the terminal device communicates with the source base station, which transmits RRC reconfiguration information including measurement configuration information to the terminal device. And the terminal equipment measures the neighbor cells according to the measurement configuration information and reports the measurement result to the source base station in a measurement report (measurement report) mode. And the source base station determines a cell with better signal quality of the adjacent cell according to the measurement report, and sends CHO requests to the candidate base station 1 and the candidate base station 2 to which the adjacent cell with better signal quality belongs respectively. If the source base station receives the CHO request acknowledgement returned by the candidate base station 1 and the candidate base station 2 (conditional handover request acknowledge, CHO requestACK), the source base station is considered to complete CHO interaction with the candidate base station 1 and the candidate base station 2. The source base station sends CHO configuration information to the terminal device, where the CHO configuration information includes candidate cell 1 to which candidate base station 1 belongs, candidate cell 2 to which candidate base station 2 belongs, and CHO trigger conditions (for example, CHO trigger conditions are signal quality thresholds) corresponding to candidate cell 1 and candidate cell 2, respectively. If the terminal equipment determines that the signal quality with the candidate cell 1 meets the CHO trigger condition, RACH is initiated to the candidate base station 1. After RACH completion, the terminal device sends a CHO complete message to the candidate base station 1 to inform the candidate base station 1 of CHO completion with the candidate base station 1.

2. Multimode dual connectivity (Multi-radio dual connectivity, MR-DC)

In a wireless network, a communication mode in which one terminal device simultaneously communicates with a plurality of network devices is called MR-DC. MR-DC may also be referred to as dual-connectivity (DC). In MR-DC, the plurality of network devices that communicate with the terminal device simultaneously may be network devices belonging to the same radio access technology (radio access technology, RAT), for example, the plurality of network devices are all 4G base stations, or all 5G base stations; or the plurality of network devices that communicate with the terminal device simultaneously may also be network devices of different RATs, for example, part of the network devices in the plurality of network devices are 4G base stations, and the rest of the network devices are 5G base stations.

In MD-RC, a network device having control plane signaling interaction with a core network is called a Master Node (MN), and other network devices are called Secondary Nodes (SNs), where the MN and/or SN can perform data plane communication with the core network. When the network device is a base station, the MN may be a primary base station and the SN may be a secondary base station. As shown in fig. 1, the network device connected to the terminal device 1 includes a network device 1 and a network device 2, and the network device 1 is configured to perform control plane signaling interaction with the core network, where the network device 1 is an MN of the terminal device 1, and the network device 2 is an SN of the terminal device 1.

In MR-DC, a terminal device may receive services from a plurality of cells to which a base station belongs, a cell group in which a MN provides services to the terminal device may be referred to as a primary cell group (MASTER CELL group, MCG), a cell group in which a SN provides services to the terminal device may be referred to as a secondary cell group (secondary cell group, SCG), and at least one cell is respectively included in the MCG and the SCG. The MCG includes a primary cell (PRIMARY CELL, pcell), where the Pcell is deployed at a primary frequency point, and the terminal device initiates an initial connection establishment procedure or initiates a connection reestablishment procedure in a cell, or indicates a cell that is the primary cell in a handover procedure. The SCG comprises a primary cell (primary secondary cell) and a secondary cell (PSCell), wherein the PSCell refers to a cell of a terminal device initiating a random access process in a secondary base station, or a cell of the secondary base station initiating a data transmission in a random access process when the terminal device skips the random access process in a secondary base station changing process, or a cell of the secondary base station initiating the random access in a synchronous reconfiguration process. PCell and PSCell may also be referred to as a special cell (SPECIAL CELL, spCell). When a plurality of cells are included in the MCG or SCG, cells other than the PCell and the SpCell are referred to as secondary cells (scells), and the SCell refers to a cell operating on a secondary carrier.

Fig. 5 is a schematic diagram of the architecture of various cells in MR-DC. As shown in fig. 5, when the terminal device establishes connection with a plurality of network devices, a cell group serving the terminal device includes MCG and SCG. MCG includes Pcell and other scells, and SCG includes PSCell and other scells. The SCell and the SpCell in the cell group perform carrier aggregation (carrier Aggregation, CA), that is, the terminal device uses multiple cells (carriers) to perform uplink and downlink communication at the same time, so as to support high-speed data transmission.

3. Mobile robustness optimization (mobility robustness optimization, MRO) mechanism

The MRO mechanism refers to: when the terminal equipment generates abnormal conditions related to mobility (such as terminal equipment handover failure, terminal equipment RLF in a target cell, etc.), reporting the abnormal parameters related to mobility to the network equipment, and automatically analyzing and optimizing the network parameters by the network equipment according to the related abnormal parameters.

Illustratively, the network device adjusts the mobility parameters based on feedback of performance metrics, which may be reported via RLF reporting (also known as RLF report) or successful handover reporting (successful handover report, SHR), or the like. Mobility parameters include parameters used in determining a handover procedure, such as a signal quality threshold for a handover, etc. The MRO mechanism can reduce the problems of early switching, late switching, ping-pong switching and the like in switching such as common-frequency switching, different-system switching and the like caused by unreasonable network parameter setting.

It should be noted that, in general, the reporting mechanism of the RLF report and the SHR is a delayed reporting, that is, the terminal device records the RLF report and the SHR, and when the terminal device accesses the network device, the terminal device sends indication information to the network device to indicate that the RLF report or the SHR exists. Further, the network device requests the terminal device to report RLF report or SHR by sending a terminal device information request (UE Information Request) message to the terminal device information; the terminal device sends the RLF report or SHR to the network device via a terminal device information response (UE Information Response) message, and the network device identifies mobility procedure problems and optimizes mobility parameters based on the RLF report and SHR.

4. Regarding RLF report

Typically the terminal device will record RLF report in the following two cases: in the first case, the terminal equipment does not receive a switching message or receives that CHO configuration is not triggered, and RLF occurs; in the second case, the terminal device receives the handover message, or receives the handover message of the dual activation protocol stack (dualactive protocol stack, DAPS), or receives the CHO configuration and triggers to connect to the target cell, but fails to access the target cell or RLF occurs soon after accessing the target cell.

Exemplary RLF report includes, but is not limited to, one or more of the following information:

1) A failed primary cell identity (FAILEDPCELLID). FAILEDPCELLID is a primary cell including RLF detected by a terminal device, and is used to indicate cell information of the primary cell or target cell information of handover failure (HOF).

2) Connection failure type (connectionFailureType). connectionFailureType includes failure types such as RLF occurrence by the terminal device, or handover failure of the terminal device, or expiration of a timer started by the terminal device (e.g., a T312 timer started after sending a measurement report).

3) Source primary cell identity (previousPCellID). previous PCell ID includes source cell information for the last time the terminal device received the handover command.

4) The cell identity is reconstructed (reestablishmentCellId). reestablishmentCellId includes cell information for initiating RRC connection re-establishment (hereinafter abbreviated RRC re-establishment) after a terminal device connection failure.

5) Connection failure time (timeConnFailure). timeConnFailure includes the time from the last receipt of the HO command by the terminal device to the connection failure.

6) Failure time (timeSinceFailure). timeSinceFailure includes the length of time that the connection of the terminal device begins to record when it fails, generally the time from when the connection of the terminal device fails to reporting RLF report.

7) RLF Cause (RLF-Cause). RLF-Cause includes the Cause of RLF occurrence by the terminal device, or the Cause of handover failure. For example, rlf-Cause is a T310 timer timeout, or is a random access problem (randomAccessProblem), or is a beam failure recovery failure (beamFailureRecoveryFailure), or is a listen before talk failure (Listen Before Talk failure), or is an RLC retransmission number overmany, etc.

8) Last HO-Type. lastHO-Type is used to indicate whether the last handover performed by the terminal device was a CHO or dual active protocol stack (dual active protocol handover, DAPS) handover.

9) CHO reconstitution time (timeSinceCHO-Reconfig). timeSinceCHO-Reconfig includes the time the last CHO command was received to CHO handover failure or RLF.

10 Time of the source cell RLF for DAPS handover (timeConnSourceDAPS-Failure). timeConnSourceDAPS-Failure includes the time of the last DAPS handoff to the source cell RLF.

11 A conditional handover cell identity (CHOCellId). The terminal device performs CHO candidate cells for CHO-based recovery (CHO based recovery).

12 Cell measurement result (measResultLastServCell): based on a synchronization signal block (synchronization signal block, SSB) and channel state reference signal (CHANNEL STATE information REFERENCE SIGNAL, CSI-RS) measurement result, including one or more of RSRP, RSRQ, and SINR, available to the source PCell when the UE detects the PCell collected at the RLF time or the handover fails.

13 Neighbor cell measurements (measresultneighbor): based on SSB and CSI-RS measurements available to cells other than the serving cell in 7) RLF when the UE detects the failure time collection, including one or more of reference signal received power (REFERENCE SIGNAL RECEIVING power, RSRP), reference signal received quality (REFERENCE SIGNAL RECEIVING quality, RSRQ), and signal-to-interference-and-noise ratio (signal to interference plus noise ratio, SINR). The method comprises the steps of including indication information of CHO candidate cells and triggering conditions;

14 A conditional handover candidate cell (CHOCandidateCellList). CHOCandidateCellList includes other CHO candidate cells than the CHO candidate cell in the neighbor cell measurement;

15 Random access information (RA-InformationCommon). The RA-InformationCommon includes an HOF, or records random access related information including one or more of random access cell identification information, random access frequency point information, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information satisfies a quality threshold, beam information for performing a random access attempt, a data amount to be transmitted for a two-step random access, and PUSCH configuration information for a two-step random access when RLF due to a random access problem or a beam failure recovery failure.

The cell identification information referred to above may include CGI, and/or PCI and frequency. In addition, the RLF report may also include the cell quality of each cell, such as the cell quality of the failed cell and/or neighbor cell when RLF is detected. Optionally, the cell identification information may further include measurement results of the cell.

Typically, when a connection failure (or link failure) occurs at the terminal device, the terminal device records RLF report; when the terminal device fails to connect again, the terminal device empties the RLF report recorded before and records the latest RLF report.

5. Report on successful handover (Successful Handover Report, SHR)

In the case of successful mobility, there may also be a potential problem that leads to mobility failure. It will be appreciated that the potential failure does not represent a true failure, but rather a phenomenon of a near handover failure is encountered during handover of the terminal device, so SHR recording is performed. In order to identify the problem of potential mobility failure in a mobility success scene, a terminal device is introduced to record and report parameters in a handover success process to a network, namely, the terminal device reports SHR to a source base station, the SHR is used for recording mobility related information in the success handover scene with the potential failure problem, and the source base station can combine SHR information and a terminal device context to optimize mobility parameters of the terminal device.

In one possible implementation, after the terminal device successfully hands over from the source base station to the target base station, the source base station receives a terminal device context release (i.e., UE context release) message from the target base station, releasing the context of the terminal device. It should be noted that, the context of the terminal device generally refers to a link established between the terminal device and the network device, and specific content includes authentication information of the terminal device, network capability of the terminal device, and the like. The terminal equipment sends the SHR to the target base station, and the target base station forwards the SHR to the source base station.

The source base station may configure the terminal device to record the SHR trigger condition (also known as SHR TRIGGER condition) through an RRC reconfiguration (also known as RRC Reconfiguration) message sent to the terminal device, and the terminal device records the SHR when the SHR TRIGGER condition is satisfied. The SHR TRIGGER condition includes, but is not limited to: 1. a timer (timer) times out (e.g., the results of the three timers, T304/T310/T312, reach a certain threshold); RLF occurs in the source cell during daps handoff.

The definitions of the T304 timer, the T310 timer and the T312 timer are as follows:

1) T304 timer

The terminal device starts a T304 timer when receiving the RRC reconfiguration message, and the running duration of the T304 timer is used to indicate a duration from when the terminal device receives the RRC reconfiguration message to when the terminal device successfully completes random access to the target network device. When the running duration of the T304 timer reaches a threshold value 1, the T304 timer is overtime, and the terminal equipment determines that the switching failure occurs; when the running duration of the T304 timer is less than the threshold 1 but greater than or equal to the threshold 2, the terminal device considers that there is a potential handover failure, and triggers SHR recording. Where the value of threshold 1 is greater than the value of threshold 2. It should be noted that, the threshold values (including the threshold values 1 to 6) mentioned in the present application are all preset values, and specific numerical values thereof can be adjusted correspondingly according to specific application scenarios, and the present application is not limited in particular.

2) T310 timer

When the terminal equipment detects a wireless link, starting a T310 timer when continuously receiving downlink out-of-step indication (out of synchronization, out of sync) number equal to N310; and stopping T310 timing when the terminal equipment continuously receives the downlink synchronization indication (in of synchronization, in sync) and the number is equal to N311. In case the T310 timer expires, the terminal device recognizes that RLF is detected and triggers an RRC connection reestablishment procedure. Wherein N310 is the number of maximum continuous downlink out of sync that needs to be received for setting to start the T310 timer, and N311 is the number of maximum continuous downlink in sync that needs to be received for setting to stop the T310 timer.

The terminal device starts a T310 timer when detecting a physical layer out-of-sync problem with the source network device, and the T310 timer is stopped if the radio link is restored during the operation of the T310 timer. The running duration of the T310 timer is used to indicate a duration between when the terminal device detects that there is a physical layer out-of-step problem with the source network device and when the terminal device detects that the radio link is restored. When the running time length of the T310 timer is greater than or equal to the threshold value 3, the T310 timer is overtime, and the terminal equipment determines that RLF occurs; when the running duration of the T310 timer is less than the threshold 3, but greater than or equal to the threshold 4, the terminal device considers that there is a potential for RLF to occur, and triggers SHR recording. Here the value of threshold 3 is greater than the value of threshold 4.

3) T312 timer

During the operation of the T310 timer, the terminal device starts the T312 timer when sending a measurement report; the T312 timer is stopped after the terminal device detects N consecutive synchronization indications from L1. Triggering the terminal equipment to carry out RRC reestablishment once the T312 timer corresponding to the MCG is overtime; once the T312 timer corresponding to the SCG expires, the terminal device sends secondary cell group failure information to the SN (i.e., SCG failure information).

During the operation of the T310 timer, the terminal device starts the T312 timer when it triggers a measurement report, and when the terminal device detects a radio link recovery, the T312 timer is stopped. The duration of operation of the T312 timer indicates the duration between the terminal device triggering a measurement report to the terminal device and the resumption of the radio link between the source network device during operation of the T310 timer. When the running time length of the T312 timer is greater than or equal to a threshold value of 5, the T312 timer is overtime, and the terminal equipment determines that RLF occurs; when the running duration of the T312 timer is less than the threshold 5, but greater than or equal to the threshold 6, the terminal device considers that there is a potential for RLF to occur, and triggers SHR recording. Where the value of threshold 5 is greater than the value of threshold 6.

In summary, the SHR recorded by the trigger of the T304 timer is usually directed to a potential failure of the terminal device during the access to the target cell, for example, a handover is premature (too early Handover); SHR of RLF trigger records occurring at the source cell during a T310/T312 timer or DAPS handoff is typically directed to a potential failure between the UE and the source cell, e.g., caused by a handoff too late (too late Handover).

6. FAST MCG LINK recovery flow

For example, please refer to the flow chart diagram of fast MCG linkrecovery shown in fig. 6. Wherein:

s601, a source MN and an SN interact to support FAST MCG LINK a recovery flow.

In other words, the source MN sends a request message to the SN requesting that the SN support FAST MCG LINK recovery procedure through separate (split) signaling radio bearers (SIGNALING RADIO BEARER, SRB) 1 or SRB 3. The SN sends a response message to the source MN to support FAST MCG LINK recovery procedures through split SRB1 or SRB 3. FAST MCG LINK recovery flow refers to signaling interaction of FAST MCG LINK recovery between the UE and the SN through SRB3 or split SRB1 after MCG RLF occurs between the terminal device and the source MN.

S602, the source MN configures FAST MCG LINK recovery flow to the terminal equipment.

In other words, the source MN issues configuration information for FAST MCG LINK recovery to the terminal device through the RRC reconfiguration message, so that the terminal device may execute FAST MCG LINK recovery procedure through information interaction with the SN after MCG RLF occurs between the source MN and the terminal device. The configuration message includes using split SRB1 or SRB3 when performing MCG fast recovery for the terminal device configuration, and configuring a first timer (e.g., T316 timer).

It should be noted that, the first timer (e.g., T316 timer) is started when the terminal device sends the primary cell group failure information to the SN (i.e., S604 is executed), and stops when the terminal device receives the first message from the source MN through the SN during the timer running (i.e., S605 is executed), otherwise, until the timer expires. That is, if the timer does not expire, the running duration of the first timer (e.g., the T316 timer) is the duration between the time the terminal device sends MCG failure information and the time the terminal device receives the first message.

S603, the terminal device detects that MCG RLF occurs with the source MN, and includes RLF information in the RLF report.

When the terminal device detects that RLF occurs with the MCG, the terminal device records an RLF report, wherein the RLF report content can see the description of the RLF report.

S604, the terminal device sends primary cell group failure information to the SN (MCG failure information) and starts a first timer (e.g., T316 timer). Accordingly, the SN forwards MCG failure information to the source MN.

In the event that a transmission between the terminal device and the SCG is available, the terminal device sends MCG failure information to the SN and starts a first timer (e.g., T316 timer). Wherein the transmission between the terminal device and the SCG may comprise: the transmission of the SCG is not suspended, the connection between the terminal device and the SCG is not broken, the SCG is not deactivated, and no PScell change/addition is ongoing. In case that the transmission between the terminal device and the SCG is not available, the terminal device performs RRC reestablishment.

In one possible implementation, the MCG failure information includes measurement results available for MCG (i.e., measurement results available for the terminal device to configure a measurement frequency point for the terminal device through SCG RRC signaling, including measurement results of a PCell in the MCG and neighbor measurement results of the PCell), measurement results available for SCG (i.e., measurement results available for the terminal device to configure a measurement frequency point for the terminal device through SCG RRC signaling, including measurement results of a PSCell in the SCG and neighbor measurement results of the PSCell), MCG link failure type (e.g., T310 timer timeout, T312 timer timeout, random Access Problem, beam Failure Recovery Failure, LBT failure, RLC retransmission failure too many, etc.).

S605, before the first timer expires, the terminal device receives a first message (handover message or RRC release message) from the source MN through the SN. Correspondingly, the source MN sends a first message to the SN, and the SN forwards the first message to the terminal equipment.

It can be appreciated that the first timer is configured with a timeout threshold value, and when the timing result of the first timer reaches the timeout threshold, the first timer stops timing. If the terminal device receives the first message from the source MN through the SN before the first timer expires (or understood as the first timer runs), it indicates that the terminal device performs FAST MCG LINK recovery successfully, and the terminal device clears the RLF report recorded in S603. If the terminal device does not receive the first message from the source MN through the SN before the first timer expires, the terminal device performs FAST MCG LINK recovery failure, the terminal device saves the RLF report recorded in S603, and the terminal device performs RRC reestablishment, and performs cell reselection.

The switching message is a switching command sent by the source MN to the terminal equipment after the source MN selects a proper cell to initiate a switching request and the target MN responds to the switching request. The terminal device thus performs handover and data forwarding based on the handover command. The RRC release message is RRC connection release information transmitted by the source MN to the terminal device. After receiving the RRC release message, the terminal equipment performs cell reselection, and after confirming that a new cell meeting the cell reselection condition exists, the terminal equipment tries to reside in the new cell.

In a possible implementation manner, before S603 is executed, the source MN sends a CHO request to the candidate MN to request that the terminal device can perform CHO to the candidate MN, and after the source MN receives the acknowledgement message sent by the candidate MN, it indicates that the terminal device can perform CHO to the candidate MN subsequently. Furthermore, the source MN configures CHO configuration information to the terminal device via the RRC reconfiguration message, where the CHO configuration information includes radio air interface configurations of the candidate cells and CHO execution trigger conditions corresponding to the candidate cells. Further, when the terminal device receives the CHO message in S605, the terminal device continuously evaluates whether any candidate MN satisfies the CHO execution trigger condition, until the terminal device detects that one candidate target cell satisfies the corresponding handover execution trigger condition, executes CHO, executes random access to the target base station and establishes RRC connection, and simultaneously disconnects the connection with the source base station. In one application scenario of the present application, in case the terminal device is configured CHO, but CHO is not triggered, the terminal device detects the MCG RLF of S603.

S606, the terminal equipment performs switching or enters an idle state according to the first message, reestablishes the MCG RRC connection and restores the MCG link of the terminal equipment.

If the first message is a handover message, the terminal device performs handover according to the handover target cell indicated by the first message, performs random access to the target cell, and establishes an RRC connection. If the first message is an RRC release message, the terminal equipment enters an idle state to select a cell, and if a proper cell is selected, RRC connection establishment is executed.

Although FAST MCG LINK recovery shown in fig. 6 is successful, there may be some potential failure reasons for the terminal device to fail FAST MCG LINK recovery in the process of executing FAST MCG LINK recovery, for example: RLF occurs when the terminal device approaches the SCG (e.g., the number of times the terminal device sends a random access message to the secondary node approaches a threshold value, if the threshold value is exceeded, the terminal device fails to randomly access the secondary node), or the time from sending MCG failure information to receiving the first message is too long (approaches the timeout threshold value of the first timer, i.e., the first timer approaches timeout), etc. These potential failure causes add uncertainty to the successful recovery of the MCG link. Thus, how to reduce execution FAST MCG LINK recovery failures due to the aforementioned potential failure causes is a highly desirable problem.

In order to improve the probability of success in executing FAST MCG LINK recovery, the present application provides a communication method, please refer to a flowchart of the communication method in fig. 7. As shown in fig. 7, fig. 7 illustrates an example in which MN, SN, and terminal devices connected by the terminal devices are executed as subjects. It is understood that the communication method execution body may be a chip in MN, a chip in SN, and a chip in terminal equipment. Wherein:

S701, when RLF occurs between the terminal device and the MN, the terminal device sends MCG failure information to the MN through the SN. Accordingly, the MN receives MCG failure information from the terminal device through the SN.

In other words, when RLF occurs between the terminal device of the MR-DC and the MN, the connection between the terminal device and the SN (or SCG as understood) still exists, so that the terminal device can send MCG failure information to the SN to cause the SN to forward the MCG failure information to the MN. Here, the specific description of the S701 embodiment may be referred to the specific description of the foregoing S604 embodiment, and will not be described here.

It should be noted that, the content of MCG failure information mentioned in S701 can be referred to the related description of MCG failure information in S604; the content of MCG failure information can also be found in the related description of MCG failure information in the following S801.

S702, in a first time after the moment of transmitting MCG failure information, the terminal device receives, through the SN, a first message from the MN. Accordingly, the MN sends a first message to the terminal device via the SN. The first message may include a handover message or an RRC release message, for example.

The first time may be understood as the running duration of the first timer being within the timeout threshold of the first timer. For a specific description of the S702 embodiment, reference may be made to the specific description of the foregoing S605 embodiment. Wherein the first timer may be a T316 timer.

S703, in case that the triggering condition is met, the terminal device records a first report, where the first report is used to indicate relevant information in executing FAST MCG LINK recovery procedure.

That is, the terminal device determines whether the trigger condition is satisfied in a case where the operation duration of the first timer is within the timeout threshold of the first timer, that is, before the first timer expires, the terminal device receives the first message. If the triggering condition is met, the terminal equipment records a first report; otherwise, in the case that the triggering condition is not satisfied or in the case of FAST MCG LINK recovery failure, the terminal device does not record the first report. The first report may be SHR, or may be another type of report, which is not limited in this aspect of the application.

Illustratively, the first report includes one or more of the following information: (1) an operation duration of the first timer. (2) identification information of the primary and secondary cells. (3) The trigger condition indication information of the first report is used for indicating the trigger reason of the first report of the trigger record (namely, the trigger condition satisfied by the first report of the trigger record). For example, in the first report, whether the trigger condition is met or not is indicated by the trigger condition cause value corresponding to the trigger condition, and when the trigger condition cause value corresponding to the trigger condition is indicated as True, the trigger condition met by the first report is recorded at this time and comprises the trigger condition; when the trigger condition reason value corresponding to the trigger condition indicates False, the trigger condition met by the first report recorded at this time does not include the trigger condition. (4) The measurement information of the SCG comprises measurement results of a PScell in the SCG and measurement results of a neighbor cell of the PScell according to measurement information measured by the terminal equipment according to measurement configuration (including configuration measurement frequency points and the like) configured by the SN. (5) And if the transmission times of Msg1 and/or MsgA in the process of randomly accessing the SN (or SCG) by the terminal equipment are excessive, namely, the transmission times of Msg1 and/or MsgA in the process of randomly accessing the SN by the terminal equipment are larger than the preset times, determining that RLF (namely, potential SCG RLF exists) is close to the situation between the terminal equipment and the SCG, and triggering and recording the first report, wherein the first report comprises the information of the random access SN of the terminal equipment. Wherein the information of the terminal device random access SN includes one or more of the following: the method comprises one or more of cell identification information of random access, frequency point information of random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for performing random access attempt, data quantity to be transmitted of two-step random access and PUSCH configuration information of two-step random access.

That is, the terminal device may indicate SN related information (including one or more of measurement result information measured by the terminal device according to the configuration of the SN for the terminal device and information of random access SN) in performing FAST MCG LINK recovery procedure and/or duration information of performing FAST MCG LINK recovery procedure through the first report.

In one possible implementation, the terminal device may receive a configuration message from the MN, the configuration message being used to configure the terminal device to record the first report if FAST MCG LINK recovery was successful and the trigger condition is met. Wherein the configuration message includes a trigger condition that records the first report. In other words, the MN configures the triggering condition for triggering the recording of the first report to the terminal device through the configuration message, and the terminal device that does not receive the configuration message of the MN does not record the first report, thereby improving the flexibility of the terminal device to record the first report. The configuration message may be the same message as the RRC reconfiguration message configured with the fast recovery procedure in S602, or may be other RRC reconfiguration messages except for the RRC reconfiguration message configured with the fast recovery procedure in S602.

The trigger conditions are described in further detail below and may include one or more of the following:

the first trigger condition and the running duration of the first timer are smaller than the first threshold value and larger than or equal to the second threshold value, and the running duration of the first timer is the duration between the time when the terminal equipment sends MCG failure information to the time when the terminal equipment receives the first message.

It can be understood that the first threshold is a timeout threshold of the first timer, and when the running duration of the first timer reaches the first threshold, the first timer times out, FAST MCG LINK recovery fails; when the running duration of the first timer is less than the first threshold but greater than or equal to the second threshold, the terminal device may consider that there is a potential for FAST MCG LINK recovery failure, and trigger recording of the first report. Wherein the second threshold is a value less than the first threshold; or the second threshold value is the product of the first threshold value and a first coefficient, the first coefficient is a positive number smaller than 1, for example, the first coefficient is a percentage coefficient, and the percentage of the second threshold value to the overtime threshold value of the first timer is indicated.

The triggering condition II is that the terminal equipment detects that RLF occurs between the terminal equipment and the MN, and the running duration of the second timer corresponding to the SN is smaller than a third threshold value and larger than or equal to a fourth threshold value; the operation duration of the second timer is as follows: the time period from the detection of the physical layer out-of-sync problem with the SN by the terminal device to the detection of the recovery of the radio link with the SN by the terminal device. The second timer may be the aforementioned T310 timer.

It can be understood that the third threshold is a timeout threshold of the second timer, when the running duration of the second timer reaches the third threshold, the second timer times out, RLF occurs near between the terminal device and the SN, and the terminal device cannot interact signaling with the MN through the SN, thereby further causing FAST MCG LINK recovery failure; when the running duration of the second timer is less than the third threshold but greater than or equal to the fourth threshold, the terminal device may consider that there is a potential RLF between the terminal device and the SN, and trigger recording the first report. Wherein the fourth threshold value is a value smaller than the third threshold value; or the fourth threshold value is the product of the third threshold value and a second coefficient, where the second coefficient is a positive number smaller than 1, for example, the second coefficient is a percentage coefficient, and the percentage of the fourth threshold value to the second timer timeout threshold value is indicated.

Triggering condition III, detecting that RLF occurs between the terminal equipment and the MN, wherein the running duration of a third timer corresponding to the SN is smaller than a fifth threshold value and larger than or equal to a sixth threshold value, and the running duration of the third timer is as follows: during the second timer run, the terminal device triggers a measurement report to the duration between the terminal device detecting the radio link recovery with the SN. Wherein the third timer may be the aforementioned T312 timer.

It can be understood that the fifth threshold is a timeout threshold of the third timer, when the running duration of the third timer reaches the fifth threshold, the third timer times out, and RLF occurs between the terminal device and the SN, thereby causing FAST MCG LINK recovery failure; when the running duration of the third timer is smaller than the fifth threshold value but larger than or equal to the sixth threshold value, the terminal device considers that the potential possibility of RLF exists between the terminal device and the SN, and triggers the recording of the first report. The sixth threshold value is a value smaller than the fifth threshold value; or the sixth threshold is the product of the fifth threshold and a third coefficient, where the third coefficient is a positive number less than 1, for example, the third coefficient is a percentage coefficient, and the percentage is used to indicate the proportion of the sixth threshold to the timeout threshold of the third timer.

And the triggering condition IV is that the terminal equipment detects that RLF occurs between the terminal equipment and the MN, the transmission times of the random access message between the terminal equipment and the SN are smaller than a seventh threshold value and larger than or equal to an eighth threshold value.

It can be appreciated that when the number of times of transmission of the random access message (e.g., msg1 and/or MsgA) between the terminal device and the SN reaches the seventh threshold, the terminal device fails to randomly access the SN, thereby resulting in FAST MCG LINK recovery failure; when the number of times of transmission of the random access message between the terminal equipment and the SN is smaller than a seventh threshold value but larger than or equal to an eighth threshold value, the terminal equipment considers that the potential possibility of RLF exists between the terminal equipment and the SN, and triggers the recording of the first report. Wherein the eighth threshold value is less than the seventh threshold value; or the eighth threshold value is the product of the seventh threshold value and a fourth coefficient, the fourth coefficient being a positive number less than 1, for example, the third coefficient being a percentage coefficient, for indicating the proportion of the seventh threshold value occupied by the eighth threshold value.

And the triggering condition five is that the terminal equipment detects that RLF occurs between the terminal equipment and the MN, and the terminal equipment detects the indication information of the RLC layer from the SN, wherein the indication information is used for indicating that the repeated transmission times occurring in the RLC layer is smaller than a ninth threshold value and larger than or equal to a tenth threshold value.

It can be understood that when the indication information of the RLC layer indicates that the number of repeated transmissions occurring in the RLC layer reaches the ninth threshold, it is determined that RLF occurs between the terminal device and the SN; when the indication information of the RLC layer indicates that the number of repeated transmissions occurring in the RLC layer is less than the ninth threshold but greater than or equal to the tenth threshold, the terminal device considers that there is a potential possibility of RLF between the terminal device and the SN, and triggers recording of the first report. Wherein the tenth threshold value is less than the ninth threshold value; or the tenth threshold value is the product of the ninth threshold value and a fifth coefficient, the fifth coefficient being a positive number less than 1, for example, the fifth coefficient being a percentage coefficient, for indicating the proportion of the tenth threshold value to the ninth threshold value.

And the triggering condition six, the terminal equipment detects that RLF occurs between the terminal equipment and the MN, and the number of continuous failures of executing LBT on the SN is smaller than an eleventh threshold value and larger than or equal to a twelfth threshold value.

It can be appreciated that when the number of consecutive failures to perform LBT on SN reaches the eleventh threshold, it is determined that RLF occurs between the terminal device and SN; when the number of consecutive failures to perform LBT on the SN is less than the eleventh threshold but greater than or equal to the twelfth threshold, the terminal device considers that there is a potential for RLF between the terminal device and the SN, triggering the recording of the first report. The twelfth threshold value is smaller than the eleventh threshold value or the twelfth threshold value is the product of the eleventh threshold value and a sixth coefficient, the sixth coefficient is a positive number smaller than 1, for example, the sixth coefficient is a percentage coefficient, which is used for indicating the proportion of the twelfth threshold value to the eleventh threshold value.

It should be noted that, the threshold values (including the first threshold value to the twelfth threshold value) mentioned in the present application are predefined values at the network side, and may be adjusted correspondingly according to specific application scenarios, which is not limited in particular by the present application.

In one possible embodiment, the first report further includes one or more of the following information: the operation time of the second timer, the operation time of the third timer, the number of random access message transmissions between the terminal device and the SN, the number of repeated transmissions occurring at the SN radio link control layer, and the number of consecutive failures to perform LBT on the SN. That is, when the trigger condition for triggering the first report of the present record is any one of the trigger conditions one to six, the first report may further include information about the trigger condition of the first report of the present record. For example, when the trigger condition of the trigger record first report is the trigger condition two, the first report may include the operation duration of the second timer in addition to one or more of the information (1) to the information (4) in S703.

S704, the terminal device sends a first report to the MN and/or SN. Accordingly, the MN and/or SN receives the first report from the terminal device.

It will be appreciated that the terminal device communicates with both the first network device (i.e., MN) and the second network device (i.e., SN), and that in the event of RLF between the terminal device and the MN, the terminal device performs FAST MCG LINK recovery procedures. After FAST MCG LINK recovery is successful, the terminal device accesses the third network device through handover or cell selection, that is, the third network device serves as the MN to which the terminal device is currently connected (or is understood to be the target MN, and the first network device is the source MN). In this case, the terminal device sends the first report to the third network device; or indicating the existence of the first report to the third network device in the RRC complete message, and after the terminal device receives the report request of the first report of the third network device, the terminal device sends the first report to the third network device. Further, the third network device performs a preliminary analysis and sends the first report to the MN and/or SN. And the third network equipment determines to send the report to the MN and/or the SN according to the trigger reason indication information of the first report, and forwards the report to the MN when the trigger condition I is met, and forwards the report to the SN when one or more of the trigger conditions II to six are met. Further, after receiving the first report, the MN or the SN may adjust mobility parameter configuration information of the terminal device according to the first report, for example, the first report indicates that the triggering condition for triggering and recording the first report of this time is the aforementioned triggering condition two, in this case, the SN optimizes configuration information of the terminal device connected to the SN, thereby reducing the probability of RLF occurring between the terminal device and the SN, thereby improving the chance of success in the FAST MCG LINK recovery process, and reducing the delay of MCG transmission recovery.

It should be noted that, the third network device may be the MN (i.e., the cell connected after the terminal device performs FAST MCG LINK recovery is a cell co-located with the source MCG) or other network devices except the MN (i.e., the cell connected after the terminal device performs FAST MCG LINK recovery is a cell different from the source MCG), and for convenience of description, the present application is explained by taking the third network device as another network device except the MN as an example, and should not be considered as a specific limitation of the present application.

It should be noted that, after the third network device receives the first report, the first report may be transmitted between the CU node and the DU node, may be transmitted between network devices, or may be transmitted between the network devices and the core network device, which is not limited by the present application. In one possible implementation, if the third network device is in a split form including a CU node and a DU node, the CU node in the third network device may receive the first report from the terminal device. Optionally, the CU node may further send part or all of the information included in the first report to the DU node. In another possible implementation, the third network device may send the first report to other network devices that need the first report, e.g., in the following step, the third network device may send the first report to the first network device (i.e., the MN) or the second network device (i.e., the SN).

In the following, taking the example that the third network device transmits the first report to the second network device, the third network device may transmit part or all of the information included in the first report to the second network device.

If there is an interface between the third network device and the second network device that can directly perform communication, the third network device may send part or all of the information of the first report to the second network device through an interface (for example, an X2 interface or an Xn interface) between the base station and the base station. Optionally, the third network device may send part or all of the information of the first report to the second network device via an indication message (e.g., a failure indication (failure indication) message or an RLF indication (RLF indication) message), a handover report message, or other message.

If the third network device and the second network device cannot directly communicate, the third network device may send part or all of the information of the first report to the second network device through the core network device. For example, part or all of the information of the first report is sent to the core network device via an interface (e.g., S1 or NG interface) between the base station and the core network device, and the information received from the third network device is forwarded by the core network device to the second network device. Optionally, the third network device may send part or all of the information of the first report to the second network device by the following message on the S1 or NG interface: an uplink RAN configuration transfer (uplink RAN configuration transfer) message, a downlink RAN configuration transfer (downlink RAN configuration transfer) message, a base station configuration transfer (eNB configuration transfer) message, a core network device configuration transfer (MME configuration transfer) message, or other message.

Note that, the manner in which the third network device transmits the first report to the first network device may refer to the manner in which the third network device transmits the first report to the first network device, which is not described herein. Optionally, the third network device may further send information of the type of the first report to the second network device or the first network device, for example, the third network device sends indication information to the second network device or the first network device, where the indication information is used to indicate that the type of the first report is SHR, or the indication information is used to indicate that the type of the first report is FAST MCG LINK reports that the report succeeds.

In summary, by the communication method described in fig. 7, in the case that the terminal device performs FAST MCG LINK recovery successfully and satisfies the trigger condition, the terminal device reports relevant information used for indicating FAST MCG LINK recovery process to the network device (including MN and/or SN), so that the network device analyzes the potential reasons possibly causing failure of FAST MCG LINK recovery process, and optimizes the FAST MCG LINK recovery configuration information of the terminal device or other terminal devices according to the analysis result, so as to reduce the probability of RLF occurring between the terminal device and SN, thereby improving the chance of success of FAST MCG LINK recovery process and reducing the delay of MCG transmission recovery.

In order to reduce the probability of MCG RLF occurrence of the terminal device, the present application also provides another communication method, and a schematic flow chart of the communication method may be shown in fig. 8 a.

Referring to fig. 8a, fig. 8a is a flow chart of another communication method according to an embodiment of the application. As shown in fig. 8a, fig. 8a illustrates an example in which MN and terminal equipment connected by the terminal equipment are taken as execution subjects. It is understood that the communication method execution body may be a chip in the MN and a chip in the terminal device. Wherein:

S801, when RLF occurs between the terminal equipment and the MN, the terminal equipment sends MCG failure information to the MN through the SN, and records an RLF report.

The specific embodiment of S801 may be referred to the descriptions of the specific embodiments of S603 and S604, and will not be repeated here. Unlike S603 and S604, the primary cell failure information in S801 may include one or more of the following information in addition to the information MCG failure information in S603 described above: (1) Information of a first cell (i.e., FAILED PCELL ID described above), which is a primary cell in which the terminal device detects that RLF occurs; (2) Information of a second cell (i.e. previous PCell ID above), where the second cell is a source primary cell of a last handover command received by the terminal device; (3) RLF cause indication information (i.e., the aforementioned RLF-cause) (4) first time information for indicating a duration between a time of a last handover command received by the terminal device and a time of RLF; (5) Second time information (i.e., TIME SINCE CHO-Reconfig, described above) for indicating a duration between the time of last CHO received by the terminal device and the time of RLF; (6) The information (ra-InformationCommon) of the terminal equipment random access MN, it can be understood that if the reason for causing MCG RLF is the random access problem of the PCell cell corresponding to FAILED PCELL ID or the beam failure recovery fails, the primary cell failure information in S801 includes the information of the terminal equipment random access MN; the information of the random access MN of the terminal device includes one or more of the following: cell identification information of random access, frequency point information of random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for carrying out random access attempt, data quantity to be transmitted of two-step random access or PUSCH configuration information of two-step random access; (7) The first indication information is used for indicating that the MN measured by the terminal equipment is a first candidate cell (comprising signal quality information) of the CHO configured by the terminal equipment when the RLF is stopped; and/or, a handover trigger condition of the first candidate cell; (8) And the second indication information is used for indicating a second candidate cell which is measured by the terminal equipment and is except the first candidate cell, namely the second candidate cell is not a CHO candidate cell configured by the MN for the terminal equipment.

S802, in the first time after the moment of sending MCG failure information, the terminal equipment receives a first message from the MN through the SN and releases the RLF report.

The description of the first time and the first message may be referred to in S702, and is not repeated herein. That is, if the terminal device receives the first message from the MN through the SN within the first time (i.e., before the T316 timer expires), FAST MCG LINK recovery is successful and the terminal device releases (or comprehends deletion) the RLF report. Otherwise, if the terminal device does not receive the first message from the MN through the SN within the first time, FAST MCG LINK recovery fails, the terminal device performs RRC reestablishment, and after the RRC reestablishment is completed, the terminal device sends the RLF report to the MN through the connected network device.

The specific embodiment of S802 may be referred to the previous descriptions of the specific embodiments of S605 to S606, and will not be repeated here.

Since MCG failure information is an immediate reporting mechanism (i.e., immediately after MCG RLF occurs, the terminal device sends MCG failure information to the SN). Thus, with the communication method shown in fig. 8a, after detecting the MCG RLF and performing FAST MCG LINK recovery successfully, the terminal device may indicate to the MN the failure scenario-related information of the MCG RLF through enhancement MCG failure information (MCG failure information containing RLF report content), so that the MN may perform MRO according to enhancement MCG failure information, whether performing FAST MCG LINK recovery procedure is successful or not, whether the terminal device releases RLF report or not.

In one possible implementation, the communication method shown in fig. 8a may be implemented in combination with the communication method shown in fig. 7, i.e. the content of MCG failure information of S701 in fig. 7 includes the content of MCG failure information described in S801 in fig. 8 a. For a more intuitive illustration, the communication method of fig. 7 and 8a is combined with the implementation process, please refer to the flow chart of the communication method shown in fig. 8b, and fig. 7 illustrates the MN, SN and the terminal device connected by the terminal device as an execution body, as shown in fig. 7. It is understood that the communication method execution body may be a chip in MN, a chip in SN, and a chip in terminal equipment. Wherein:

S8001, when RLF occurs between the terminal device and the MN, the terminal device sends MCG failure information to the SN and records the RLF report.

The specific embodiment of S8001 may be referred to the specific embodiment of S701 or S801, and the explanation of MCG failure information may be referred to the explanation of MCG failure information in S801.

S8002, SN sends MCG failure information to MN.

S8003, MN sends a first message to SN.

Here, the description of the first message may be referred to the description of the first message in S702 or S802.

S8004, in a first time after the moment of transmitting MCG failure information, the terminal device receives the first message sent by the SN, and then the terminal device releases the RLF report.

For the description of the first time, reference may be made to the description of the first time in S702 or S802. The foregoing description of the embodiment of S802 may be found in relation to the embodiment of S8004.

S8005, in case that the trigger condition is satisfied, the terminal device records a first report, which is used to indicate relevant information in executing FAST MCG LINK recovery procedure.

Among them, the embodiment regarding S8005 can be referred to the description of the foregoing embodiment of S703.

S8006, the terminal device sends a first report to the third network device.

Wherein, the description of the third network device can be referred to the description of the third network device in S704.

S8007, the third network device sends a first report to the MN and/or SN.

The specific embodiment of S8007 may refer to the foregoing explanation of S704 that the third network device transmits the first report to the second network device portion.

In order to implement the functions in the method provided in the embodiment of the present application, the terminal device, MN and SN may include hardware structures and/or software modules, and implement the functions in the form of hardware structures, software modules, or both hardware structures and software modules. Some of the functions described above are performed in a hardware configuration, a software module, or a combination of hardware and software modules, depending on the specific application of the solution and design constraints.

As shown in fig. 9, an embodiment of the present application provides a communication apparatus 900. The communication device 900 may be a component of a terminal device (e.g., an integrated circuit, a chip, etc.), a component of a MN (e.g., an integrated circuit, a chip, etc.), or a component of a SN (e.g., an integrated circuit, a chip, etc.). The communication device 900 may also be other communication units for implementing the method according to the embodiment of the method of the present application. The communication device 900 may include: a communication unit 901, a processing unit 902, and a storage unit 903.

In one possible design, one or more of the units as in FIG. 9 may be implemented by one or more processors or by one or more processors and memory; or by one or more processors and transceivers; or by one or more processors, memory, and transceivers, to which embodiments of the application are not limited. The processor, the memory and the transceiver can be arranged separately or integrated.

The communication apparatus 900 has a function of implementing the terminal device or MN or SN described in the embodiment of the present application. For example, the communication apparatus 900 includes modules or units or means (means) corresponding to steps involved in the terminal device or MN or SN described in the embodiment of the present application by the sender, where the functions or units or means (means) may be implemented by software, or implemented by hardware, or implemented by executing corresponding software by hardware, or implemented by a combination of software and hardware. Reference is further made in detail to the corresponding description in the foregoing corresponding method embodiments.

In one possible design, a communication device 900 may include: a storage unit 903 and a communication unit 901;

A communication unit 901, configured to send MCG failure information to the MN through the SN when RLF occurs between the terminal device and the MN; wherein the MCG failure information is configured to request execution FAST MCG LINK recovery; the communication unit 901 is further configured to receive, via the SN, a first message from the MN in a first time after the time of transmission MCG failure information; wherein the first message comprises a handover message or an RRC release message; a storage unit 903 for recording a first report in case the trigger condition is satisfied; the first report is used for indicating relevant information in the process of executing FAST MCG LINK recovery; further, the communication unit 901 is further configured to send the first report to the MN.

In an alternative embodiment, the communication unit 901 is further configured to receive a configuration message from the MN, where the configuration message is used to record the first report if FAST MCG LINK recovery is successful and the trigger condition is met; wherein the configuration message includes a trigger condition.

In an alternative embodiment, the first report includes one or more of the following information: the method comprises the steps of running duration of a first timer, identification information of a primary cell and a secondary cell, triggering condition indication information of a first report, measurement information of SCG and information of random access SN of terminal equipment; the running duration of the first timer is a duration between the time when the terminal device sends MCG failure information the first message to the time when the terminal device receives the first message.

In an alternative embodiment, the information of the terminal device random access SN includes one or more of the following: the method comprises one or more of cell identification information of random access, frequency point information of random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for performing random access attempt, data quantity to be transmitted of two-step random access and PUSCH configuration information of two-step random access.

The running duration of the first timer is smaller than a first threshold value and larger than or equal to a second threshold value, and the running duration of the first timer is the duration between the time when the terminal equipment sends MCG failure information to the time when the terminal equipment receives the first message; the second threshold value is the product of the first threshold value and a first coefficient, and the first coefficient is a positive number smaller than 1; or the second threshold value is a value smaller than the first threshold value;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the MN, and the running duration of the second timer corresponding to the SN is smaller than a third threshold value and larger than or equal to a fourth threshold value; the operation duration of the second timer is as follows: the time length from the detection of the physical layer out-of-step problem with the SN by the terminal equipment to the detection of the recovery of the wireless link between the terminal equipment and the SN; the fourth threshold value is the product of the third threshold value and a second coefficient, and the second coefficient is a positive number smaller than 1; or the fourth threshold value is a value smaller than the third threshold value;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the MN, the running duration of the third timer corresponding to the SN is smaller than a fifth threshold value and larger than or equal to the sixth threshold value, and the running duration of the third timer is as follows: during the operation period of the second timer, the terminal equipment triggers a measurement report to the time period between the detection of the wireless link recovery between the terminal equipment and the SN; the sixth threshold value is the product of the fifth threshold value and a third coefficient, and the third coefficient is a positive number smaller than 1; or the sixth threshold is a value less than the fifth threshold;

Or the terminal equipment detects that RLF occurs between the terminal equipment and the MN, and the transmission times of the random access message between the terminal equipment and the SN are smaller than a seventh threshold value and larger than or equal to an eighth threshold value; wherein the eighth threshold value is the product of the seventh threshold value and a fourth coefficient, and the fourth coefficient is a positive number smaller than 1; or the eighth threshold value is smaller than the seventh threshold value;

Or the terminal equipment detects RLF between the terminal equipment and the MN, and the terminal equipment detects the indication information of the wireless link control layer from the SN, wherein the indication information is used for indicating that the repeated transmission times of the wireless link control layer is smaller than a ninth threshold value and larger than or equal to a tenth threshold value; wherein the tenth threshold value is the product of the ninth threshold value and a fifth coefficient, and the fifth coefficient is a positive number smaller than 1; or the tenth threshold value is smaller than the ninth threshold value;

or the terminal equipment detects that RLF occurs between the terminal equipment and the MN, and the continuous failure times of executing the uplink LBT on the SN is smaller than an eleventh threshold value and larger than or equal to a twelfth threshold value; wherein the twelfth threshold value is the product of the eleventh threshold value and a sixth coefficient, and the sixth coefficient is a positive number smaller than 1; or the twelfth threshold value is less than the eleventh threshold value.

In an alternative embodiment, the first report further comprises one or more of the following information: the operation time of the second timer, the operation time of the third timer, the number of random access message transmissions between the terminal device and the SN, the number of repeated transmissions occurring at the SN radio link control layer, and the number of consecutive failures to perform LBT on the SN.

In an alternative embodiment, the storage unit 903 is further configured to record an RLF report when RLF occurs between the terminal device and the MN; the storage unit 903 is further configured to release the RLF report if the communication unit 901 is further configured to receive a first message from the MN through the SN in a first time after the time of transmitting MCG failure information.

In an alternative embodiment MCG failure information includes one or more of the following information: information of a first cell, wherein the first cell is a main cell in which the terminal equipment detects that RLF occurs; information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment; cause indication information of RLF failure; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; the second time information is used for indicating the duration between the time of the last CHO command received by the terminal equipment and the time of RLF; the terminal equipment randomly accesses the information of the MN; the first indication information is used for indicating that the MN measured by the terminal equipment is a first candidate cell of the CHO configured by the terminal equipment when the RLF is stopped; and/or, a handover trigger condition of the first candidate cell; and second indication information for indicating a second candidate cell measured by the terminal device other than the first candidate cell.

In an alternative embodiment, the information of the random access MN of the terminal device includes one or more of the following: the method comprises the steps of random access cell identification information, random access frequency point information, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for random access attempt, two-step random access to-be-transmitted data amount or two-step random access PUSCH configuration information.

With regard to the above-mentioned more detailed description of the communication unit 901 and the storage unit 903, reference may be made to the relevant description of the terminal device in the method embodiment of fig. 7 or fig. 8b, which is not described here.

In one possible design, a communication device 900 may include: a communication unit 901;

A communication unit 901, configured to receive MCG failure information from a terminal device through SN; wherein MCG failure information is used to request execution FAST MCG LINK recovery;

A communication unit 901, configured to send a first message to a terminal device through SN; wherein the first message comprises a handover message or an RRC release message;

The communication unit 901 is further configured to receive a first report from the terminal device, where the first report is used to indicate relevant information in executing FAST MCG LINK recovery procedure when the terminal device meets a trigger condition.

In an alternative embodiment, the communication unit 901 is further configured to send a configuration message to the terminal device, where the configuration message is used to record the first report if FAST MCG LINK recovery is successful and the trigger condition is met; wherein the configuration message includes a trigger condition.

In an alternative embodiment, the trigger condition includes one or more of the following: the running duration of the first timer is smaller than a first threshold value and larger than or equal to a second threshold value, and the running duration of the first timer is the duration between the time when the terminal equipment sends MCG failure information to the time when the terminal equipment receives the first message; the second threshold value is the product of the first threshold value and a first coefficient, and the first coefficient is a positive number smaller than 1; or the second threshold value is a value smaller than the first threshold value;

With respect to the above description of the communication unit 901 in more detail, reference is made to the related description of the MN in the method embodiment of fig. 7 or fig. 8b, which is not described here.

In one possible design, a communication device 900 may include: a communication unit 901; wherein:

A communication unit 901, configured to receive MCG failure information from a terminal device when RLF occurs between the terminal device and the MN; wherein the MCG failure information is configured to request execution FAST MCG LINK recovery; the communication unit 901 is further configured to send the MCG failure information to the MN; the communication unit 901 is further configured to receive a first message from the MN; wherein the first message comprises a handover message or an RRC release message; the communication unit 901 is further configured to send the first message to a terminal device; the communication unit 901 is further configured to receive a first report from the terminal device, where the first report is used to indicate relevant information in performing FAST MCG LINK recovery procedure, in case the terminal device satisfies the trigger condition.

For a more detailed description of the above communication unit 901, reference may be made to fig. 7 or to the related description of SN in the method embodiment of fig. 8b, which is not described here.

In one possible design, a communication device 900 may include: a storage unit 903, a processing unit 902, and a communication unit 901;

A processing unit 902, configured to determine MCG failure information when RLF occurs between the terminal device and the MN;

a communication unit 901 for sending MCG failure information to the MN through the SN; wherein MCG failure information includes one or more of the following information: information of a first cell, wherein the first cell is a main cell in which the terminal equipment detects that RLF occurs; information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment; cause indication information of RLF failure; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; the second time information is used for indicating the duration between the time of the last CHO command received by the terminal equipment and the time of RLF; the terminal equipment randomly accesses the information of the MN; the first indication information is used for indicating that the MN measured by the terminal equipment is a first candidate cell of the CHO configured by the terminal equipment when the RLF is stopped; and/or, a handover trigger condition of the first candidate cell; and second indication information for indicating a second candidate cell measured by the terminal device other than the first candidate cell.

In an alternative embodiment, the storage unit 903 is configured to record an RLF report when the terminal device generates an RLF with the MN; if a first message from the MN is received through the SN in a first time after the moment of sending MCG failure information, the storage unit 903 is further configured to release the RFL report; wherein the first message comprises a handover message or an RRC release message.

For a more detailed description of the communication unit 901, the processing unit 902 and the storage unit 903, reference is made to the relevant description of the terminal device in the method embodiment of fig. 8a or fig. 8b, which is not described here.

A communication unit 901, configured to receive MCG failure information from a terminal device through SN when RLF occurs between the terminal device and MN; wherein MCG failure information includes one or more of the following information: information of a first cell, wherein the first cell is a main cell in which the terminal equipment detects that RLF occurs; information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment; cause indication information of RLF failure; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; the second time information is used for indicating the duration between the time of the last CHO command received by the terminal equipment and the time of RLF; the terminal equipment randomly accesses the information of the MN; the first indication information is used for indicating that the MN measured by the terminal equipment is a first candidate cell of the CHO configured by the terminal equipment when the RLF is stopped; and/or, a handover trigger condition of the first candidate cell; and second indication information for indicating a second candidate cell measured by the terminal device other than the first candidate cell.

For a more detailed description of the above communication unit 901, reference is made to the related description of the MN in the method embodiment shown in fig. 8a or fig. 8b, which is not described here.

A communication unit 901, configured to receive MCG failure information from a terminal device when RLF occurs between the terminal device and the MN; and sends the MCG failure information to the MN; wherein MCG failure information includes one or more of the following information: information of a first cell, wherein the first cell is a main cell in which the terminal equipment detects that RLF occurs; information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment; cause indication information of RLF failure; the first time information is used for indicating the duration between the moment of the last switching command received by the terminal equipment and the moment of the RLF; the second time information is used for indicating the duration between the time of the last CHO command received by the terminal equipment and the time of RLF; the terminal equipment randomly accesses the information of the MN; the first indication information is used for indicating that the MN measured by the terminal equipment is a first candidate cell of the CHO configured by the terminal equipment when the RLF is stopped; and/or, a handover trigger condition of the first candidate cell; and second indication information for indicating a second candidate cell measured by the terminal device other than the first candidate cell.

For a more detailed description of the above communication unit 901, reference may be made to the relevant description of SN in the method embodiment shown in fig. 8a or fig. 8b, which is not described here.

The embodiment of the application also provides a communication device 1000, and fig. 10 is a schematic structural diagram of the communication device 1000. The communication device 1000 may be a terminal device, or may be a chip, a chip system, a processor, or the like that supports the terminal device to implement the above method. The communication device 1000 may be an MN, or may be a chip, a system-on-chip, a processor, or the like that supports the MN to implement the above method. The communication device 1000 may be an SN, or may be a chip, a chip system, a processor, or the like that supports SN to implement the above method. The device can be used for realizing the method described in the method embodiment, and can be particularly referred to the description in the method embodiment.

The communications device 1000 may include one or more processors 1001. The processor 1001 may be a general purpose processor or a special purpose processor, etc. For example, it may be a baseband processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate or transistor logic device, discrete hardware components or central processing unit (central processing unit, CPU). The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control communication devices (e.g., base stations, baseband chips, terminals, terminal chips, distributed Units (DUs) or centralized units (centralized unit, CUs), etc.), execute software programs, and process data of the software programs.

Optionally, the communication device 1000 may include one or more memories 1002, on which instructions 1004 may be stored, which may be executed on the processor 1001, to cause the communication device 1000 to perform the method described in the method embodiments above. Optionally, the memory 1002 may also store data. The processor 1001 and the memory 1002 may be provided separately or may be integrated.

The Memory 1002 may include, but is not limited to, nonvolatile Memory such as a hard disk (HARD DISK DRIVE, HDD) or Solid State Disk (SSD), random access Memory (Random Access Memory, RAM), erasable programmable read-Only Memory (Erasable Programmable ROM, EPROM), ROM or portable read-Only Memory (Compact Disc Read-Only Memory, CD-ROM), and the like.

Optionally, the communication device 1000 may further include a transceiver 1005, an antenna 1006. The transceiver 1005 may be referred to as a transceiver unit, a transceiver circuit, or the like, for implementing a transceiver function. The transceiver 1005 may include a receiver, which may be referred to as a receiver or a receiving circuit, etc., for implementing a receiving function, and a transmitter; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing a transmitting function.

The communication device 1000 is a terminal device, and the communication device 1000 is configured to perform the steps performed by the terminal device in the communication method shown in fig. 7, 8a or 8 b.

The communication device 1000 is an MN, and the communication device 1000 is configured to perform the steps performed by the MN in the communication method shown in fig. 7, 8a or 8 b.

The communication device 1000 is an SN, and the communication device 1000 is configured to perform the steps performed by the SN in the communication method shown in fig. 7, 8a or 8 b.

In another possible design, a transceiver may be included in processor 1001 to implement receive and transmit functions. For example, the transceiver may be a transceiver circuit, or an interface circuit. The transceiver circuitry, interface or interface circuitry for implementing the receive and transmit functions may be separate or may be integrated. The transceiver circuit, interface or interface circuit may be used for reading and writing codes/data, or the transceiver circuit, interface or interface circuit may be used for transmitting or transferring signals.

In yet another possible design, the processor 1001 may optionally have instructions 1003 stored thereon, where the instructions 1003 run on the processor 1001, and may cause the communications device 1000 to perform the method described in the method embodiment above. Instructions 1003 may be solidified in processor 1001, in which case processor 1001 may be implemented by hardware.

In yet another possible design, communication device 1000 may include circuitry that may implement the functions of transmitting or receiving or communicating in the foregoing method embodiments. The processors and transceivers described in embodiments of the present application may be implemented on integrated circuits (INTEGRATED CIRCUIT, ICs), analog ICs, radio frequency integrated circuits (radio frequency integrated circuit, RFIC), mixed signal ICs, application Specific Integrated Circuits (ASICs), printed circuit boards (printed circuit board, PCBs), electronic devices, and the like. The processor and transceiver may also be fabricated using a variety of IC process technologies such as complementary metal oxide semiconductor (complementary metal oxide semiconductor, CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (PMOS), bipolar junction transistor (Bipolar Junction Transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The scope of the communication device described in the embodiments of the present application is not limited thereto, and the structure of the communication device may not be limited by fig. 10. The communication means may be a stand-alone device or may be part of a larger device. For example, the communication device may be:

(1) A stand-alone integrated circuit IC, or chip, or a system-on-a-chip or subsystem;

(2) A set of one or more ICs, optionally including storage means for storing data, instructions;

(3) An ASIC, such as a modem;

(4) Modules that may be embedded within other devices;

The communication device and the chip in the embodiments of the present application may also implement the implementation manner described in the communication device 1000. Those of skill in the art will further appreciate that the various illustrative logical blocks (illustrative logical block) and steps (steps) described in connection with the embodiments of the application may be implemented by electronic hardware, computer software, or combinations of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Those skilled in the art may implement the described functionality in varying ways for each particular application, but such implementation is not to be understood as beyond the scope of the embodiments of the present application.

The embodiments of the present application and the embodiments of the methods shown in the foregoing communications methods are based on the same concept, and the technical effects brought by the embodiments of the present application are the same, and the specific principles refer to the description of the embodiments shown in the foregoing communications methods, which is not repeated.

The application also provides a computer readable storage medium storing computer software instructions which, when executed by a communications device, implement the functions of any of the method embodiments described above.

The application also provides a computer program product for storing computer software instructions which, when executed by a communications device, implement the functions of any of the method embodiments described above.

The application also provides a computer program which, when run on a computer, implements the functions of any of the method embodiments described above.

The application also provides a communication system comprising one or more network devices, which may further comprise one or more terminal devices. In another possible design, the system may further include other devices that interact with the network device and the terminal device in the scheme provided by the application.

In the above embodiments, the implementation may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., SSD), etc.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, the method comprising:

When a radio link failure occurs between a terminal device and a master node, transmitting master cell group failure information to the master node through an auxiliary node; the primary cell group failure information is used for requesting to execute quick primary cell group link recovery;

Receiving, by the secondary node, a first message from the primary node in a first time after a time at which the primary cell group failure information is transmitted; wherein the first message includes a handover message or a radio resource control release message;

Recording a first report when the trigger condition is satisfied; the first report is used for indicating relevant information in the process of executing the fast primary cell group link recovery;

and sending the first report to the main node and/or the auxiliary node.

2. The method according to claim 1, wherein the method further comprises:

receiving a configuration message from the primary node, the configuration message being used to configure the recording of the first report if the fast primary cell group link recovery is successful and the trigger condition is satisfied; wherein the configuration message includes the trigger condition.

3. The method of claim 1 or 2, wherein the first report comprises one or more of the following information: the operation time of a first timer, the identification information of a main cell and an auxiliary cell, the triggering condition indication information of the first report, the measurement information of an auxiliary cell group and the information of the random access of terminal equipment to an auxiliary node;

the running duration of the first timer is the duration between the time when the terminal equipment sends the failure information of the primary cell group to the time when the terminal equipment receives the first message.

4. A method according to claim 3, wherein the information of the terminal device random access to the secondary node comprises one or more of the following: the method comprises one or more of cell identification information of random access, frequency point information of random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for performing random access attempt, data quantity to be transmitted of two-step random access and physical uplink shared channel configuration information of two-step random access.

5. The method of any one of claims 1-4, wherein the trigger condition comprises one or more of:

the running time of the first timer is smaller than a first threshold value and larger than or equal to a second threshold value, and the running time of the first timer is the time between the moment when the terminal equipment sends the failure information of the main cell group to the moment when the terminal equipment receives the first message;

wherein the second threshold value is a product of the first threshold value and a first coefficient, and the first coefficient is a positive number smaller than 1; or the second threshold value is a value smaller than the first threshold value;

or the terminal equipment detects that the radio link failure occurs between the terminal equipment and the main node, and the running time of the second timer corresponding to the auxiliary node is smaller than a third threshold value and larger than or equal to a fourth threshold value; the operation duration of the second timer is as follows: the time length from the detection of the physical layer out-of-step problem with the auxiliary node by the terminal equipment to the detection of the recovery of the wireless link between the terminal equipment and the auxiliary node;

wherein the fourth threshold value is a product of the third threshold value and a second coefficient, and the second coefficient is a positive number smaller than 1; or the fourth threshold value is a value smaller than the third threshold value;

Or the terminal equipment detects that radio link failure occurs between the terminal equipment and the main node, and the operation duration of a third timer corresponding to the auxiliary node is smaller than a fifth threshold value and larger than or equal to a sixth threshold value, wherein the operation duration of the third timer is as follows: during the operation of the second timer, the terminal equipment triggers a measurement report to the time length between the detection of the terminal equipment and the recovery of the wireless link between the terminal equipment and the auxiliary node;

Wherein the sixth threshold is a product of the fifth threshold and a third coefficient, and the third coefficient is a positive number smaller than 1; or the sixth threshold is a value less than the fifth threshold;

Or the terminal equipment detects that a radio link failure occurs between the terminal equipment and the main node, and the transmission times of the random access message between the terminal equipment and the auxiliary node are smaller than a seventh threshold value and larger than or equal to an eighth threshold value;

Wherein the eighth threshold value is the product of the seventh threshold value and a fourth coefficient, and the fourth coefficient is a positive number smaller than 1; or the eighth threshold value is smaller than the seventh threshold value;

Or the terminal equipment detects that radio link failure occurs between the terminal equipment and the main node, and the terminal equipment detects indication information of a radio link control layer from the auxiliary node, wherein the indication information is used for indicating that the repeated transmission times occurring in the radio link control layer is smaller than a ninth threshold value and larger than or equal to a tenth threshold value;

wherein the tenth threshold value is the product of the ninth threshold value and a fifth coefficient, and the fifth coefficient is a positive number smaller than 1; or the tenth threshold value is smaller than the ninth threshold value;

Or the terminal equipment detects that radio link failure occurs between the terminal equipment and the main node, and the continuous failure times of performing uplink Listen Before Talk (LBT) on the auxiliary node is smaller than an eleventh threshold value and larger than or equal to a twelfth threshold value;

Wherein the twelfth threshold value is the product of the eleventh threshold value and a sixth coefficient, and the sixth coefficient is a positive number smaller than 1; or the twelfth threshold value is smaller than the eleventh threshold value.

6. The method of claim 5, wherein the first report further comprises one or more of the following information: the operation duration of the second timer, the operation duration of the third timer, the number of random access message transmissions between the terminal device and the auxiliary node, the number of repeated transmissions occurring at the auxiliary node radio link control layer, and the number of continuous failures in performing LBT on the auxiliary node.

7. The method according to any one of claims 1-6, further comprising:

when radio link failure occurs between the terminal equipment and the main node, recording a Radio Link Failure (RLF) report;

And if the first message from the master node is received by the auxiliary node in the first time after the moment of sending the failure information of the master cell group, releasing the RLF report.

8. The method of claim 7, wherein the primary cell group failure information includes one or more of the following:

Information of a first cell, wherein the first cell is a main cell in which a terminal device detects that a radio link failure occurs;

information of a second cell, wherein the second cell is a source main cell of a last switching command received by the terminal equipment;

Radio link failure cause indication information;

The first time information is used for indicating duration between the moment of the last switching command received by the terminal equipment and the moment of the radio link failure;

Second time information, the second time information is used for indicating the duration between the time of the last conditional switching command received by the terminal equipment and the time of the radio link failure;

the terminal equipment randomly accesses the information of the main node;

the first indication information is used for indicating a first candidate cell which is configured for the terminal equipment by the main node and is measured by the terminal equipment when the radio link fails; and/or a handover triggering condition of the first candidate cell;

And the second indication information is used for indicating a second candidate cell which is measured by the terminal equipment and is other than the first candidate cell.

9. The method of claim 8, wherein the information for the terminal device to randomly access the master node comprises one or more of:

The method comprises the steps of random access cell identification information, random access frequency point information, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for random access attempt, two-step random access data quantity to be transmitted or two-step random access Physical Uplink Shared Channel (PUSCH) configuration information.

10. A method of communication, the method comprising:

Receiving failure information of a main cell group from terminal equipment through an auxiliary node; the primary cell group failure information is used for requesting to execute quick primary cell group link recovery;

Sending a first message to the terminal equipment through the auxiliary node; wherein the first message includes a handover message or a radio resource control release message;

And receiving a first report from the terminal equipment under the condition that the terminal equipment meets the triggering condition, wherein the first report is used for indicating relevant information in the process of executing the fast primary cell group link recovery.

11. The method of claim 10, wherein the method further comprises:

Transmitting a configuration message to the terminal equipment, wherein the configuration message is used for configuring the first report to be recorded under the condition that the quick main cell group link is successfully recovered and the triggering condition is met; wherein the configuration message includes the trigger condition.

12. The method of claim 10 or 11, wherein the first report includes one or more of the following information: the operation time of a first timer, the identification information of a main cell and an auxiliary cell, the triggering condition indication information of the first report, the measurement information of an auxiliary cell group and the information of the random access of terminal equipment to an auxiliary node;

13. The method according to claim 12, wherein the information of the terminal device random access to the secondary node comprises one or more of the following: the method comprises one or more of cell identification information of random access, frequency point information of random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for carrying out random access attempt, data quantity to be transmitted of two-step random access and Physical Uplink Shared Channel (PUSCH) configuration information of two-step random access.

14. The method according to any one of claims 10-13, wherein the trigger condition comprises one or more of:

15. The method of claim 14, wherein the first report further comprises one or more of the following information: the operation duration of the second timer, the operation duration of the third timer, the number of random access message transmissions between the terminal device and the auxiliary node, the number of repeated transmissions occurring at the auxiliary node radio link control layer, and the number of continuous failures in performing LBT on the auxiliary node.

16. The method according to any of claims 10-15, wherein the primary cell group failure information comprises one or more of the following information:

The reason indicating information of the radio link failure;

the terminal equipment randomly accesses the information of the main node;

17. The method according to claim 16, wherein the information of the terminal device random access to the master node comprises one or more of the following:

18. A communication device, comprising: a module or unit for performing the method of any one of claims 1 to 9; or comprises a module or unit for performing the method of any one of claims 10-17.

19. A communication device comprising a processor and interface circuitry for receiving signals from other communication devices than the communication device and transmitting signals from the processor to the processor or sending signals from the processor to other communication devices than the communication device, the processor being configured to implement the method of any of claims 1-9 or 10-17 by logic circuitry or executing code instructions.

20. A communication system comprising a primary node and a secondary node, wherein the primary node is configured to perform the method of any of claims 10-17.

21. The communication system according to claim 20, characterized in that the communication system further comprises a terminal device for performing the method according to any of claims 1-9.

22. A computer readable storage medium, characterized in that the storage medium has stored therein a computer program or instructions which, when executed by a communication device, implement the method of any of claims 1-9 or 10-17.

23. A computer program product, characterized in that the computer is caused to perform the method of any of claims 1-9 or 10-17 when the computer reads and executes the computer program product.