CN117751677A

CN117751677A - Method and device for reporting failure information of primary cell group

Info

Publication number: CN117751677A
Application number: CN202180100712.9A
Authority: CN
Inventors: 董柏序; 姚琴波; 常俊仁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2024-03-22
Also published as: WO2023070656A1

Abstract

The application relates to the technical field of wireless communication and discloses a method and a device for reporting failure information of a main cell group. The method for reporting the failure information of the primary cell group comprises the following steps: the terminal receives a switching execution message sent by a secondary cell group in a double-connection state, wherein the message is used for indicating to conduct cell switching to a target secondary primary cell; if the terminal receives a first message sent by the target auxiliary main cell under the condition that the main cell group in the double-connection state fails in radio link, sending main cell group failure information to a network through the target auxiliary main cell so as to indicate the network to trigger a main cell group quick reestablishment flow; the first message is used for indicating that the terminal is successfully switched to the target auxiliary main cell. By adopting the scheme, under the condition that the wireless link between the terminal and the main cell group fails and the wireless link between the terminal and the auxiliary cell group is unstable, the wireless link resource connection reestablishing process is not directly triggered, so that the recovery of the wireless link between the terminal and the main cell group is accelerated.

Description

Method and device for reporting failure information of primary cell group

Technical Field

The embodiment of the application relates to the field of wireless communication, in particular to a reporting method and device for failure of a primary cell group.

Background

Today's wireless communication networks are widely deployed in life to provide diverse communication services such as voice, video, packet data, messaging, broadcast, and so on. Based on different wireless application scenarios and the requirement of multiple services, wireless access technologies and wireless communication networks can develop in a diversified manner, and coexist and complement in a longer period of time. The service networks and the wireless access technologies suitable for different wireless application scenes form a multi-system communication network which is seamlessly covered and can provide good service experience, and thus, a user is in an environment covered by the multi-system communication network.

Taking mobile communication technology networks as examples, long term evolution (Long Term Evolution, LTE) networks and New Radio (NR) networks are faced with long term coexistence. In order to realize interconnection between communication network systems and improve the radio resource utilization rate of the whole mobile network system, a Dual-Connectivity (DC) technology is introduced to support the terminal to connect two cells at the same time, thereby increasing throughput of a single user. The two cells each correspond to a primary cell group (Master Cell group, MCG) and a secondary cell group (Secondary Cell group, SCG), wherein the cell group where the cell where the terminal initiates random access first is the primary cell group. The wireless link between the terminal and the network can be classified into an MCG link and an SCG link.

Link failure may occur due to instability of the wireless connection. When the MCG fails, the radio link may be restored through an MCG reestablishment procedure or an MCG failure information procedure. In the prior art, when the SCG is in an unstable state (for example, in a handover process), the terminal cannot start the MCG failure information flow, and then the MCG reestablishment flow must be triggered to reestablish the radio link of the MCG. The MCG reconstruction process consumes long time and has poor stability, so that the service recovery efficiency is low. Therefore, research is necessary to improve the MCG failure information flow, improve the reestablishment efficiency and stability of the wireless link, and improve the communication experience of the user.

Disclosure of Invention

The embodiment of the application provides a processing method and a processing device for failure of a primary cell group, which are used for accelerating recovery of a wireless link between a terminal and a primary cell group when the wireless link between the terminal and the primary cell group fails and the wireless link between the terminal and a secondary cell group is unstable, reducing time consumption caused by triggering a wireless resource control (Radio Resource Control, RRC) connection reestablishment flow, and guaranteeing user service quality and communication experience.

In a first aspect, embodiments of the present application provide a method of wireless communication, the method being executable by a wireless communication device. The method comprises the following steps: the terminal receives a switching execution message sent by a secondary cell group in a double-connection state, wherein the message is used for indicating to conduct cell switching to a target secondary primary cell; if the terminal receives a first message sent by the target auxiliary main cell under the condition that the main cell group in the double-connection state fails in radio link, sending main cell group failure information to a network through the target auxiliary main cell so as to indicate the network to trigger a main cell group quick reestablishment flow; the first message is used for indicating that the terminal is successfully switched to the target auxiliary main cell.

Based on the method, when the wireless link of the secondary cell group is unstable, the terminal executes the failure information flow of the primary cell group after waiting for the cell switching to finish after the wireless link of the primary cell group fails, so as to avoid triggering the RRC reestablishment flow, thereby accelerating the recovery of the wireless link of the primary cell group of the terminal and reducing the time consumption.

As another possible implementation manner, the terminal does not receive the first message within a period of time (i.e., the first time) after performing cell handover to the target secondary primary cell, and sends a radio resource control connection reestablishment message to the primary cell group; wherein the radio resource control connection reestablishment message is used to indicate to reestablish the radio link of the primary cell group, and the first time is configured.

Based on the method, the terminal can balance the time loss of waiting for the cell switching to be completed and the time loss of triggering the RRC reestablishment flow by shortening the waiting time for the first message to the first time, so that the long-time waiting of the network under the extreme condition is avoided, and the time required for recovering the wireless link with the main cell group is shortened.

In a specific implementation of the above method, the terminal further includes a random access procedure during the cell handover process performed to the target auxiliary primary cell, specifically: transmitting a random access preamble message to the target cell for indicating random access to the target cell; and receiving a response message from the target cell, wherein the response message is used for indicating that the random access to the target cell is successful.

Wherein the terminal can flexibly adopt different schemes by recognizing a random access process in the handover to the target auxiliary primary cell. When the random access is a non-competitive random access flow, the terminal judges that the switching success of the target auxiliary main cell is high, and therefore waits for executing the main cell group failure information flow. When the random access is a contention based random access procedure, the terminal may take further sub-division measures or decide to start a primary cell group failure information procedure or a radio resource control connection re-establishment procedure by a limited waiting (i.e. first time).

As a possible implementation manner, in a case where the random access is a contention-based random access, the terminal selectively transmits the radio resource control connection reestablishment message to the primary cell group according to the measurement report; wherein the measurement report includes measurement information to reflect the signal quality of the target secondary primary cell.

In the technical scheme, after judging that the random access is the contention-based random access, the terminal can acquire the measurement information of the target auxiliary main cell according to the measurement report obtained by measuring the target auxiliary main cell before the terminal. The terminal can obtain the signal quality of the target auxiliary primary cell through analysis of measurement information (such as the received power of the downlink reference signal). The terminal may then selectively send a radio resource control link reestablishment message to the primary cell group based on the signal quality. And the reconstruction efficiency of the wireless link of the main cell group is improved through further subdivision judgment.

As a further possible implementation manner, the selectively sending, by the terminal, the radio resource control connection reestablishment message to the primary cell group according to a measurement report includes: and when the measurement information is lower than a preset first threshold value, sending the radio resource control connection reestablishment message to the main cell group.

In the technical scheme, the terminal compares the measurement information with a preset first threshold value, and under the condition that the measurement information is lower than the first threshold value, the target auxiliary main cell is considered to have poor signal quality, and the success probability of switching to the cell of the cell is lower, so that the radio resource control connection reestablishment message is actively triggered, and the time consumption is saved. And when the measurement information is not lower than the first threshold value, not triggering the radio resource control connection reestablishment message immediately. And then determining a failure information flow of the primary cell group or a radio resource control connection reestablishment flow according to whether the first message is received in the first time.

In addition to the simple comparison, the first time may be adjusted according to the measurement information and the first threshold value, so as to conform to the signal quality of the target cell, thereby selectively transmitting the radio resource control connection reestablishment message.

As a further implementation manner, the measurement information at least includes a received power of the downlink reference signal. The received power of the downlink reference signal can well reflect the signal quality of the switched cell, so that the received power can be extracted and used as a basis for measuring the possibility of successful switching of the cell.

In a second aspect, an embodiment of the present application provides a wireless communication device, including a processing unit and a transceiver unit, where the processing unit is configured to control the transceiver unit; the transceiver unit is configured to transmit and receive related functions, and includes: receiving a switching execution message sent by a secondary cell group in a double-connection state, wherein the switching execution message is used for indicating cell switching to a target auxiliary primary cell; receiving a first message sent by the target auxiliary main cell under the condition that the main cell group in the double-connection state fails in radio link, wherein the first message is used for indicating that the target auxiliary main cell is successfully switched; and sending primary cell group failure information to the target auxiliary primary cell, wherein the primary cell group failure information is used for indicating that a wireless link between the target auxiliary primary cell and the primary cell group fails.

Optionally, the transceiver unit includes a receiving unit and a transmitting unit. In one design, the wireless communication device is a communication chip, the processing unit may be one or more processors or processor cores, and the transceiver unit may be an input/output circuit or interface of the communication chip.

In another design, the transceiver unit may be a transmitter and a receiver, or the transceiver unit may be a transmitter and a receiver.

Optionally, the wireless communication device further comprises respective modules operable to perform any of the embodiments of any of the wireless communication methods of the first aspect described above.

In a third aspect, embodiments of the present application provide a wireless communication device, which may be a terminal, or may be a chip for a terminal. The apparatus has the functionality to implement the method of the first aspect described above or any of its possible implementations. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a fourth aspect, embodiments of the present application provide a wireless communication device comprising a processor and a memory. Optionally, a transceiver is also included. The memory is for storing a computer program or instructions, and the processor is for calling and executing the computer program or instructions from the memory, which when executed by the processor, cause the wireless communication device to perform any one of the embodiments of any one of the wireless communication methods of the first aspect described above.

In the alternative, the processor is one or more, and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

Alternatively, the memory may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory.

In a fifth aspect, a system is provided, the system comprising the above wireless communication device and a network equipment.

In a sixth aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions) which, when executed, causes a computer to perform the method of any one of the possible implementations of the first aspect described above, or causes a computer to perform the method of any one of the implementations described above.

In a seventh aspect, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first to second aspects described above, or causes the computer to perform the method of any one of the implementations described above.

In an eighth aspect, a system on a chip is provided, which may include a processor. The processor is coupled to the memory and is operable to perform the method of any one of the first aspect to the second aspect and any one of the possible implementations of any one of the first aspect to the second aspect. Optionally, the system on a chip further comprises a memory. Memory for storing a computer program (which may also be referred to as code, or instructions). A processor for calling and running a computer program from a memory, such that a device on which the system-on-chip is installed performs the method in any one of the possible implementations of the first aspect.

In a ninth aspect, there is provided a wireless communication apparatus comprising: interface circuitry and processing circuitry. The interface circuit may include an input circuit and an output circuit. The processing circuitry is to receive signals via the input circuitry and to transmit signals via the output circuitry such that the method of any one of the possible implementations of the first aspect is implemented.

In a specific implementation process, the wireless communication device may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the output signal may be output by, for example and without limitation, a transmitter and transmitted by a transmitter, and the input circuit and the output circuit may be the same circuit, which functions as the input circuit and the output circuit, respectively, at different times. The embodiments of the present application do not limit the specific implementation manner of the processor and the various circuits.

In one implementation, the wireless communication apparatus may be a wireless communication device, i.e., a computer device supporting wireless communication functionality. Specifically, the wireless communication device may be a terminal such as a smart phone, or may be a radio access network device such as a base station. The system-on-chip may also be referred to as a system-on-chip (SoC), or simply as a SoC chip. The communication chip may include a baseband processing chip and a radio frequency processing chip. The baseband processing chip is sometimes also referred to as a modem (modem) or baseband chip. The radio frequency processing chip is sometimes also referred to as a radio frequency transceiver (transceiver) or radio frequency chip. In a physical implementation, some or all of the communication chips may be integrated inside the SoC chip. For example, the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip. The interface circuit may be a radio frequency processing chip in the wireless communication device, and the processing circuit may be a baseband processing chip in the wireless communication device.

In yet another implementation, the wireless communication apparatus may be part of a device in a wireless communication device, such as an integrated circuit product, e.g., a system chip or a communication chip. The interface circuit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuitry, etc. on the chip or system of chips. A processor may also be embodied as processing or logic circuitry.

Drawings

Fig. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a dual connection scenario provided in an embodiment of the present application;

fig. 3 is a schematic flow chart of primary cell group failure information provided in an embodiment of the present application;

fig. 4 is a schematic diagram of a radio resource control connection reestablishment flow according to an embodiment of the present application;

fig. 5 is a schematic flow chart of cell handover according to an embodiment of the present application;

fig. 6 is a schematic diagram of two random access flows provided in the embodiment of the present application in fig. 6; fig. 6a is a schematic diagram of a contention-based random access procedure provided in an embodiment of the present application, and fig. 6b is a schematic diagram of a non-contention-based random access procedure provided in an embodiment of the present application;

fig. 7 is a schematic flow chart of a primary cell group failure information provided in an embodiment of the present application;

fig. 8 is a schematic diagram of another primary cell group failure information flow provided in an embodiment of the present application;

fig. 9 is a schematic diagram of another primary cell group failure information flow provided in an embodiment of the present application;

fig. 10 is a schematic block diagram of a wireless communication device provided in an embodiment of the present application;

fig. 11 is a schematic structural diagram of a wireless communication device according to an embodiment of the present application.

It should be understood that in the foregoing structural schematic diagrams, the sizes and forms of the respective block diagrams are for reference only and should not constitute an exclusive interpretation of the embodiments of the present application. The relative positions and inclusion relationships between the blocks presented by the structural diagrams are merely illustrative of structural relationships between the blocks, and are not limiting of the physical connection of the embodiments of the present application.

Detailed Description

The technical scheme provided by the application is further described below by referring to the accompanying drawings and examples. It should be understood that the system structures and service scenarios provided in the embodiments of the present application are mainly for explaining some possible implementation manners of the technical solutions of the present application, and should not be construed as unique limitations of the technical solutions of the present application. Those skilled in the art can appreciate that, as the system evolves and updated service scenarios appear, the technical solutions provided in the present application may still be applicable to the same or similar technical problems.

It should be understood that the technical solution provided in the embodiments of the present application includes an active recovery method for an abnormality after a failure of activation of a security mode and related devices. In the following description of the specific embodiments, some repetition is not described in detail, but it should be understood that the specific embodiments have mutual references and can be combined with each other.

In a wireless communication system, devices may be classified into devices providing wireless network services and devices using wireless network services. Devices providing wireless network services are those devices that make up a wireless communication network, which may be referred to simply as network devices (network equipment), or network elements. Network devices are typically owned by and are responsible for operation or maintenance by operators (e.g., china mobile and Vodafone) or infrastructure providers (e.g., iron tower companies). The network devices may be further divided into radio access network (radio access network, RAN) devices and Core Network (CN) devices. A typical RAN apparatus includes a Base Station (BS).

It should be appreciated that a base station may also sometimes be referred to as a wireless Access Point (AP), or a transmitting receiving point (transmission reception point, TRP). Specifically, the base station may be a general node B (generation Node B, gNB) in a 5G New Radio (NR) system, an evolved node B (evolutional Node B, eNB) of a 4G long term evolution (long term evolution, LTE) system.

Devices that use wireless network services are typically located at the edge of the network and may be referred to simply as terminals (terminals). The terminal can establish connection with the network device and provide specific wireless communication service for the user based on the service of the network device. It should be appreciated that terminals are sometimes referred to as User Equipment (UE), or Subscriber Units (SU), due to their closer relationship to the user. In addition, terminals tend to move with users, sometimes referred to as Mobile Stations (MSs), relative to base stations that are typically placed at fixed locations. In addition, some network devices, such as a Relay Node (RN) or a wireless router, may be considered terminals because they have UE identities or belong to users.

Specifically, the terminal may be a mobile phone (mobile phone), a tablet computer (tablet computer), a laptop computer (laptop computer), a wearable device (such as a smart watch, a smart bracelet, a smart helmet, smart glasses), and other devices with wireless access capability, such as a smart car, various internet of things (internet of thing, IOT) devices, including various smart home devices (such as smart meters and smart home appliances), and smart city devices (such as security or monitoring devices, intelligent road transportation facilities), and the like.

For convenience of description, the base station and the terminal will be taken as examples in this application, and the technical solution of the embodiment of this application will be described in detail.

Fig. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present application. As shown in fig. 1, the wireless communication system includes a terminal and a base station. The transmission link from terminal to base station is denoted as Uplink (UL) and the transmission link from base station to terminal is denoted as Downlink (DL) according to the transmission direction. Similarly, data transmission in the uplink may be abbreviated as uplink data transmission or uplink transmission, and data transmission in the downlink may be abbreviated as downlink data transmission or downlink transmission.

In the wireless communication system, the base station can provide communication coverage for a specific geographic area through an integrated or external antenna device. One or more terminals located within the communication coverage area of the base station may access the base station. One base station may manage one or more cells (cells). Each cell has an identification, also called cell identity (cell ID). From the radio resource point of view, one cell is a combination of downlink radio resources and (optionally) uplink radio resources paired therewith.

It should be appreciated that the wireless communication system may conform to the wireless communication standard of 3GPP, or may conform to other wireless communication standards, such as the 802 family (e.g., 802.11, 802.15, or 802.20) of institute of Electrical and electronics Engineers (Institute of Electrical and Electronics Engineers, IEEE). Although only one base station and one terminal are shown in fig. 1, the wireless communication system may include other numbers of terminals and base stations. The wireless communication system may further comprise other network devices, such as core network devices.

The terminals and base stations should be aware of the predefined configuration of the wireless communication system, including the radio access technologies (radio access technology, RAT) supported by the system, as well as the radio resources specified by the system, such as radio frequency bands and carriers. A carrier is a range of frequencies that meets system specifications. This range of frequencies may be determined by the center frequency of the carrier (denoted carrier frequency) and the bandwidth of the carrier. The predefined configuration of these systems may be determined as part of the standard protocols of the wireless communication system or by the interaction between the terminal and the base station. The content of the standard protocols of the wireless communication system may be pre-stored in memories of the terminal and the base station and/or embodied as hardware circuits or software codes of the terminal and the base station.

In the wireless communication system, the terminal and the base station support one or more same RATs, such as 5g nr,4g LTE, or RATs of future evolution systems. Specifically, the terminal and the base station adopt the same air interface parameters, coding scheme, modulation scheme, and the like, and communicate with each other based on radio resources specified by the system. Wherein the air interface parameter is a parameter for describing characteristics of the air interface. In English, the air interface parameter is sometimes also referred to as numerology. The air interface parameters may include subcarrier spacing (subcarrier spacing, SC) and may also include Cyclic Prefix (CP). The wireless communication system may support a variety of different air interface parameters that may be part of a standard protocol.

When different types of base stations are cooperatively networked, because the bandwidth resources and coverage of a single node are limited, wireless resources of a plurality of cells or nodes are concentrated to provide services for the terminal, thereby meeting the higher requirements of users on capacity and coverage. This way of centralizing radio resources of multiple cells or nodes to provide services to users is called multi-connectivity. Multiple connections include carrier aggregation, dual connectivity, and so on.

The dual-connection technology, that is, the terminal may receive signals transmitted by two base stations in one area, and resource transmission is performed through cooperative scheduling between the base stations, so that user performance improvement is facilitated, and certain assistance is provided for overall throughput and switching delay of users.

Today, with the development of technology, mobile communication has undergone multiple generations of development, and is now in the fifth generation (5 g) mobile communication system. In the evolution of the mobile communication network from the fourth Generation (4G) to the fifth Generation, the radio access network and the core network are not synchronously evolved, and thus a 5G radio access network (Next Generation RAN, NG-RAN), a 5G core network (Next Generation Core, NGC), a 4G radio access network (Evolved Universal Terrestrial Radio Access, E-UTRA), and a 4G core network (Evolved Packet Core, EPC) coexist in the system. Since 5G network deployment is a progressive process, this dual connectivity mechanism may exist for a long period of time before the existing 4G network architecture is fully replaced with a 5G network. Such a dual-connectivity network architecture between E-UTRA and NR nodes or between two NR nodes is also known as Multi-mode dual-connectivity (Multi-Radio Dual Connectivity, MR-DC) technology.

Fig. 2 is a schematic diagram of a dual connection scenario provided in an embodiment of the present application, as shown in fig. 2, including a terminal 21, a Master Node 22 (MN), and a Secondary Node 24 (SN). The master node 22 is a radio access node providing a control plane connection for communication between the terminal 21 and the core network, and is connected to a Mobility Management Entity (MME) through a control plane interface S1-MME. Correspondingly, the secondary node 24 is a radio access node which is not connected to the control plane of the core network and which provides only additional resources for the terminal 21.

Each node is associated with a set of serving cells, the primary node 22 corresponding to primary cell group 23 (Master Cell Group, MCG) and the secondary node corresponding to secondary cell group 25 (Secondary Cell Group, SCG). Wherein the MCG23 further comprises a Primary Cell (PCell) and optionally one or more Secondary cells (scells); the SCG25 comprises a secondary primary cell (also called primary secondary cell, primary Secondary Cell, PSCell) and optionally one or more scells. The PCell and PSCell may also be collectively referred to as a Special Cell (SpCell).

The terminal 21 is configured such that the resources it uses are provided by two nodes 22, 24 of a non-ideal backhaul connection, one of which provides NR access and the other of which provides E-UTRA or NR access. In addition, since the core network is also distinguished from EPC by NGC, multimode dual connectivity can be mainly divided into the following four types:

1. evolved universal terrestrial radio access and dual connectivity mode for new air interface (E-UTRA-NR dual connectivity, EN-DC). In this mode, the primary node 22 to which the terminal 21 is connected is an eNB, and the secondary node 24 is an en-gcb. The master node 22 is connected to the core network EPC via an S1 interface and to the slave node 24 via an X2 interface. The secondary node 24 may connect with the EPC through an S1-U interface and with other en-gNB through an X2-U interface.

2. NR-E-UTRA double linkage (NE-DC). In this mode, the primary node 22 to which the terminal 21 is connected is a gNB and the secondary node 24 is a ng-eNB. The primary node 22 is connected to the core network NGC and may be connected to the secondary node 24 via an Xn interface.

3. NG-RAN E-UTRA-NR dual connectivity (NGEN-DC). In this mode, the primary node 22 to which the terminal 21 is connected is a ng-eNB, and the secondary node 24 is a gNB. The primary node 22 is connected to the core network NGC and may also be connected to the secondary node 24 via an Xn interface.

4. NR-NR double connectivity (NR-DC). In this mode, the primary node 22 to which the terminal 21 is connected is one gNB, and the secondary node 24 is also one gNB. The primary node 22 is connected to the core network NGC via an NG interface and to the secondary node 24 via an Xn interface.

The following description and the subsequent embodiments are developed with the EN-DC mode as a main scenario, where in this mode, the master node is a 4G base station eNB, and may download control plane messages and user plane messages to the terminal. The secondary node is a 5G base station gNB, and may send a message to the terminal as an additional radio bearer resource under the direction of the primary node, the message including a control plane message and a user plane message, both messages being from the primary node.

It should be appreciated that the following embodiment method can be extended to other MR-DC modes as well to solve the same technical problems.

In EN-DC, the UE connects two cell groups, MCG and SCG, respectively, each of which in turn has one primary cell group (corresponding to the primary node eNB) and possibly a plurality of secondary cell groups (corresponding to the secondary node gNB). Since the cell group can be divided into a primary cell and a secondary cell, the cells to which the UE is connected can be divided into the following three types: one primary cell PCell in the MCG, one secondary primary cell PSCell in the SCG, and possibly one or more secondary cells scells of the separate MCG or SCG.

Therefore, the radio link between the UE and the network is divided into two types, i.e., an MCG link and an SCG link. After the UE is started, the establishment of the MCG link is firstly executed, and after the establishment of the SCG link is successful, the establishment of the SCG link is executed. Since the wireless link is not always stable, it may fail in a variety of situations, including, for example, radio interference, synchronization problems, movement, etc. When the radio link between the UE and the MCG fails, the connection between the UE and the MCG can be recovered by two methods, namely triggering the MCG failure information flow or the RRC connection reestablishment flow. The UE preferably resumes the radio link (R16 and above protocols, UE capability support in DC scenario) by the former, and if the trigger fails, the radio resource control (Radio Resource Control, RRC) connection reestablishment procedure is used.

1. MCG failure information flow.

Fig. 3 is a schematic flow chart of MCG failure information provided in the embodiment of the present application, where UE represents a terminal device, NW represents a network, and the network includes a primary node and an auxiliary node, or may refer to a cell and a cell group corresponding to the node, which are all commonly referred to as a network. After activating the access layer security in the RRC connection configuration process, the UE may trigger the MCG failure information procedure. The flow is used for informing the network UE of the radio link failure condition of the main cell group, and the failure reasons comprise random access problem, maximum retransmission times upper limit, beam failure recovery failure of the main cell group and the like.

In this procedure, the UE will suspend MCG transmission of all signaling radio bearers SRB (except SRB 0) and data radio bearers DRB; the configuration for the MCG is reset. So far, the radio link resources of the access MCG stored by the UE are released, and the signaling message cannot be transferred. Therefore, the UE needs to send MCG failure information to NW uplink over the radio link with SCG, which information can be carried by the uplink information transfer (UL Information Transfer) message. The content of the MCG failure information contains the radio link failure type and the cell measurement report. And when the UE transmits the information MCG failure information, ending the MCG failure information flow.

After the NW receives the message, an RRC reconfiguration message (for instructing the UE to perform a system handover) or a different system handover message (Mobility from NR Command for instructing the UE to perform a different system handover) or an RRC release message (for instructing the UE to perform a redirection operation) is issued through the MCG. In the 5G communication network, the cell may be a 5G base station gNB or a 4G base station eNB, and when the target cell and the source cell of the handover are in the same system (i.e., radio access technology), the handover is referred to as intra-RAT handover, otherwise, inter-RAT handover. In the above handover, the target cell is designated by NW. For example, when the UE is in EN-DC mode and the primary cell is a 4G cell, after triggering the MCG failure information flow, if the UE receives the RRC reconfiguration message, the UE switches to another designated 4G cell; if a handover message is received, a handover is performed to another designated cell, the cell type including, but not limited to, a 5G cell and a 4G cell, but the cell type is different from the original cell type.

When the UE receives the RRC release message, the UE performs cell redirection. The cell redirection is mainly used for indicating the UE to change the operation of the current cell when the cell is overloaded, the switching trigger fails or the UE does not support PS switching. By carrying redirection information (e.g., redirection frequency point information: redirection frequency point information) in the RRC connection release message, the NW instructs the UE to select the target system cell.

From the above, when the UE executes the MCG failure information flow to recover the radio link between the UE and the MCG, the UE is mainly realized through handover or redirection, so that the UE has the advantages of short time consumption, high efficiency and high stability.

The T316 timer is defined in the 3GPP protocol because of network environment and the like, which may cause the NW to fail to receive MCG failure information or the UE to fail to receive the three messages. The T316 timer is used to calculate that when the UE does not receive the response of the network to the MCG failure information within the time specified by the timer, the RRC connection reestablishment procedure is triggered.

Further, since the uplink transmission of MCG failure information depends on the radio link between the UE and SCG, it is limited by the state in which the radio link is located. In 5G, the MCG and the SCG of the UE each correspond to a different base station, and radio bearers between the two base stations and the UE each operate independently, so that it may happen that the MCG and the SCG are both in a state where an existing radio link is unavailable or unstable, for example, the MCG fails in radio link, and an auxiliary primary cell in the SCG is in a handover state. In this case, the UE does not trigger the MCG failure information procedure but triggers the RRC connection reestablishment procedure.

2. RRC connection reestablishment procedure.

Fig. 4 is a schematic diagram of an RRC reestablishment procedure according to an embodiment of the present application, where it can be seen that the procedure includes the following steps:

step 401, the UE performs cell search and selects a target cell.

Step 402, the UE performs random access to the target cell.

Steps 403-405, reestablish the RRC connection with the target cell.

Steps 406-407, the UE reconfigures the RRC connection with the target cell to restore the MCG radio link.

When the UE completes the establishment and configuration of the RRC connection with the target cell, the radio link between the UE and the target cell may be regarded as being restored. The random access in step 402 may be divided into two types, namely, contention-based random access and non-contention random access, and will be specifically described with reference to fig. 6 and the following. Generally speaking, contention-based random access takes longer than non-contention random access, and it should be noted that when the primary node corresponding to the primary cell group is the 5G base station gNB, the UE needs to perform random access twice to the NW, which affects the efficiency of RRC connection reestablishment to a greater extent. When the NW completes the reconfiguration of the parameters of the RRC connection of the UE, steps 406 and 407, the UE resumes communication with the network. The overall RRC connection re-establishment procedure is therefore time consuming and the stability of the procedure is poor due to random access.

Summarizing, in the prior art, when the UE fails MCG, the radio link between the UE and the MCG may be recovered through the MCG failure information procedure or the RRC connection reestablishment procedure. The MCG failure information flow has small time delay and high success rate, but the UE triggers the flow on the premise that: the wireless link between it and the SCG is in a steady state. And when the wireless link between the UE and the SCG is in an unstable state or the UE fails to trigger the MCG failure information flow, the RRC connection reestablishment flow is triggered. The process has the characteristics of long time consumption and low efficiency.

From the above, it can be seen that one of the preconditions of the UE triggering the MCG failure information flow is to determine whether the radio link between the UE and the SCG is stable. Reference is made to the description in the prior art, which indicates whether the secondary primary cell PSCell of the UE is in a handover state. Fig. 5 is a schematic flow chart of cell handover according to an embodiment of the present application. In the process, the UE is switched from a source cell to a target cell to acquire a cell channel with better communication quality, and the specific steps are as follows:

step 501, a source cell issues measurement configuration, which is used for configuring measurement parameters including information such as measurement frequency points, cell information, reporting conditions, and the like.

Step 502, the UE performs measurement, and after reaching the configured reporting condition, performs measurement reporting to the source cell, so as to indicate the target cell meeting the condition.

In step 503, the source cell sends a handover preparation message to the target cell, for allocating resources for the UE.

Step 504, after the target cell completes resource preparation, a handover preparation success message is sent to the source cell.

Step 505, the source cell issues a handover execution message to the UE.

Step 506, the UE accesses the target cell through a random access procedure.

In this process, after the UE receives the handover execution message issued by the source cell, it performs synchronous access to the target cell. At this point, the radio link of the UE with the source cell is broken, i.e., the UE cannot communicate with the network. After the UE completes synchronous access with the target cell, the wireless link between the UE and the target cell is recovered, and the UE can communicate with a network. Therefore, when the UE starts to perform cell handover, the radio link of the corresponding cell group may be in an unstable state, and communication between the UE and the network cannot be performed through the radio link.

To mark the beginning execution of the cell handover, the UE starts a T304 timer (5G cell) or a T307 timer (4G cell). If the cell switching is not completed within the limited time, the UE considers that the corresponding cell group fails, and the cell group is rebuilt.

In addition, in addition to the above-mentioned cell handover indication from the network, a conditional handover technique is introduced in 5G, so that the UE can autonomously perform cell handover. Similarly, when a UE starts to perform an access operation to a target cell, the radio link of its corresponding cell group may be in an unstable state, and communication between the UE and the network cannot be performed through the radio link.

Since the synchronous access of the UE to the target cell is based on the random access procedure, fig. 6 is a schematic diagram of two random access procedures provided in the embodiment of the present application. Fig. 6a is a schematic diagram of a contention-based random access (CBRA) flow provided in an embodiment of the present application. This flow occurs between the UE and the network, which may be referred to as a cell or a base station. The dashed boxes in the figure represent different operations that the terminal may take, and the dashed lines represent steps that may occur but are not necessary for a complete random access procedure. The method comprises the following steps:

step 601, the UE sends a random access preamble, where the random access preamble is used to obtain uplink resource grant.

Since random access is based on contention access, a base station can receive random access preambles transmitted by a plurality of terminals at the same time, which do not respond to all the received random access preambles. Thus, the terminal starts a backoff window (backoff) and monitors the feedback of the base stations (i.e., the random access response corresponding to the aforementioned random access preamble) within this backoff window, by:

in step 602a, the base station does not feedback or send a random access response error, and the UE makes a new transmission attempt of the random access preamble to the base station again until the number of attempts expires or receives a correct random access response.

Step 602b, the UE receives a correct random access response from the base station, where the random access response carries configuration requirement information of uplink resources.

Step 603, the UE transmits an uplink message, which is denoted Msg 3.

Due to network instability, the transmission of Msg 3 may fail, so Ue takes the following actions based on the base station feedback (i.e. contention resolution message corresponding to Msg 3 described above):

step 604a, the base station does not feedback or send a wrong contention resolution message, and ue retransmits Msg 3 based on a configuration mode until the maximum retransmission times; and if the contention resolution message is not received, restarting the random access flow.

Step 604b, the UE receives a correct contention resolution message from the base station, where the contention resolution message is used to indicate that the Msg 3 is successfully sent, and the random access procedure ends.

As can be seen from the above, the UE needs to wait for feedback from the base station twice before successful access, and during this waiting period, retransmission of the uplink message will be performed. Therefore, the time delay of the random access flow based on competition has the characteristics of uncertainty, long overall time consumption and high power consumption.

As shown in fig. 6b, a non-contention random access (CFRA) flow chart is provided in an embodiment of the present application. The method comprises the following specific steps:

Step 601, the UE receives non-contention random access preamble information from a base station.

Step 602, the UE sends the assigned random access preamble message to the base station.

Step 603, the UE receives a random access response message from the base station.

Wherein the non-contention random access preamble information is carried by dedicated downlink signaling (e.g., RRC connection reestablishment message), and the information is used to indicate a channel and a preamble. According to the indication of the information, the UE initiates random access on a designated channel by a designated preamble, so that the UE can access the network at a faster speed and uplink and downlink synchronization, and is the fastest access mode.

The type of the UE performing random access is determined by NW, for example, in RRC signaling issued by the network, a rach-configwithsync field is configured with a rach-configdedicate cell, where the cell is used to indicate a dedicated access resource, and after the UE obtains resource information indicated by the cell, the UE performs CFRA; otherwise, the UE synchronizes to the cell through CBRA.

Therefore, if the random access in the cell switching process of the UE is CBRA, the whole time is long, and the stability is poor; in the case of CFRA, the whole time consumption is relatively short and the stability is good due to the use of special resources. When the UE performs RRC connection reestablishment, the random access procedure must be CBRA, and in a 5G environment, CBRA needs to be performed twice, so that the UE consumes a long time, has low efficiency, and has poor stability.

Summarizing, there are two main methods for recovering the radio link of the primary cell group: 1. through the RRC connection reestablishment process, the process consumes long time and has low service recovery efficiency; 2. the time consumption is short and the service recovery efficiency is high through the failure information flow of the main cell group. In the prior art, when the PSCell performs cell handover, the terminal directly triggers the RRC connection reestablishment procedure, so that the service recovery speed is slow.

In order to solve the above problems, the general idea of the embodiment of the present application is as follows: the UE is prevented from directly triggering the RRC connection reestablishment flow of the main cell group under the condition of PScell switching, the failure information flow of the main cell group is optimized, the applicability of the flow is enhanced, and the service recovery time is shortened to the greatest extent. The following describes specific embodiments that are compatible with existing standard protocols and are implemented as products.

Fig. 7 is a schematic diagram of a primary cell group failure information flow provided in an embodiment of the present application. The MN is a master node corresponding to the MCG in the network, and the SN represents a slave node corresponding to the SCG in the network, which will not be described in detail later. The flow chart comprises the following steps:

step 701, the UE receives a radio resource control connection reconfiguration message from the primary cell group.

Step 702, the UE receives a radio resource control connection reconfiguration message from the secondary cell group.

Step 703, the UE receives a handover execution message from the secondary cell group, where the handover execution message is used to instruct cell handover to a target PSCell.

Step 704, radio link failure occurs between the UE and the primary cell group.

Step 705, the UE sends a random access preamble message to the target PSCell, for indicating synchronous access to the target PSCell.

Step 706, the UE receives a response message from the target PSCell, where the response message is used to indicate that the handover to the target PSCell is successful.

Step 707, the UE sends primary cell group failure information to the target secondary primary cell, where the primary cell group failure information is used to indicate that a radio link between the UE and the primary cell group fails.

Steps 701 and 702 are used to determine that the UE is in a dual connectivity state, i.e. the wireless connection between the UE and the primary and secondary cell groups is established and stable. Steps 703 and 704 are used to determine that an event of radio connection failure of the primary cell group occurs when the UE performs cell handover in the secondary cell group, where the case of handover of the secondary cell group is that the PSCell of the UE performs cell handover.

In step 705, the UE sends a random access preamble message to the target PSCell, performs multiple signaling interactions with the cell according to the type of random access (i.e., contention-based random access CBRA or non-contention-based random access CFRA), and receives a response message from the cell after the access is successful. The response message may be a random access response message to indicate completion of CFRA; the response message may also be a contention resolution message to indicate completion of CBRA. In addition, the response message may be an RRC connection reconfiguration message, where the RRC connection reconfiguration message is an RRC message that may exist and is issued by the network after the end of the random access procedure and is used to configure the radio connection between the terminal and the target secondary primary cell, and the message may also indicate that the handover to the target secondary primary cell is successful.

When the secondary cell group of the UE completes the handover and the connection with the secondary cell group is stable, the UE can execute the failure information flow of the primary cell group to recover the wireless connection with the primary cell group. The primary cell group failure information may be included in an uplink information transfer message uploaded by the UE, and transmitted to the network through a radio link between the UE and the SCG.

In the above flow, the UE resumes the radio connection between the UE and the primary cell group by waiting for the secondary primary cell handover to be completed, i.e., after receiving the response message, and then executing the primary cell group failure information flow.

By the method, the UE can avoid unavoidable high delay caused by directly triggering the RRC reestablishment flow under the condition that the wireless connection of the main cell group fails during the switching of the auxiliary main cell. Therefore, in the process of recovering the wireless connection between the UE and the primary cell group, the UE can wait for the delay of the completion of the switching of the secondary cell group, so that the short delay of the failure information flow of the primary cell group replaces the high delay of the RRC reestablishment flow.

It should be noted that, the above procedure yields the greatest benefit when the access of the terminal to the target PSCell is CFRA. According to the foregoing description of the random access procedure, the UE may perceive the access procedure as CBRA or CFRA. In CFRA, the UE does not need to start a backoff window, which is time-consuming and has high stability. Therefore, the UE starts the failure information flow of the main cell group after waiting for CFRA to finish, reduces the recovery time consumption of the wireless link and obtains the maximum benefit. When the access is CBRA, better benefits can be obtained under the condition of stable network environment.

As can be seen from the above, when the UE waits for the handover to be completed and triggers the primary cell group failure information flow under the condition that the secondary cell group handover and the primary cell group radio connection failure occur simultaneously, the UE avoids directly starting the RRC connection reestablishment flow to reduce the recovery time of the radio connection as much as possible.

However, in the case of network congestion, there are also cases where the random access procedure is long (e.g., the timer runs out). To avoid this, the primary cell group failure information flow may be further refined as follows:

step 803, the UE receives a handover execution message from the secondary cell group, where the handover execution message is used to instruct cell handover to a target PSCell.

Step 804, radio link failure occurs between the UE and the primary cell group.

Step 805, the UE sends a random access preamble message to the target PSCell, where the random access preamble message is used to indicate synchronous access to the target PSCell.

Step 806, the UE starts a timer, which is set with a first duration.

Step 807, the UE receives a response message from the target PSCell in a first time period, where the response message is used to indicate that the handover to the target PSCell is successful.

Step 808, the UE sends primary cell group failure information for informing the network that the radio link between the UE and the MCG experiences failure.

After the MCG connection failure occurs, the UE delays triggering of RRC connection reestablishment by starting a timer, so that the UE has an opportunity to recover the link through the MCG failure information flow. And when the timer expires, i.e. the cell handover of the PSCell is not completed within the first duration, the UE triggers RRC connection re-establishment.

In this embodiment, the UE may wait for the cell handover procedure to end, and then resume the radio link with the MCG through the MCG failure information procedure. Moreover, by setting the first duration, the UE can balance the short time spent waiting for completion of PSCell handover with the long time spent directly executing the RRC connection reestablishment procedure, so as to avoid the situations of network problems and unsuccessful cell handover for a long time. By appropriate adjustment of the first time-length value, the UE can obtain a larger benefit in recovering the MCG.

The value of the first time period can be adjusted or fixed. For example, the first time period may be valued with reference to one or more of the following time periods, and the first time period should not be valued more than any of the time periods incorporated by reference.

1. Reestablishing a connection based on RRC is time consuming. As long as the first duration is shorter than the RRC connection reestablishment time, the PSCell has a larger probability of successful handover, thereby obtaining benefits. The first duration based on the time can be controlled to be in the hundred milliseconds, and can be obtained according to historical network searching and random access time consumption calculation.

2. Based on the T304 or T307 timer. The T304 timer and the T307 timer are respectively used for calculating the time of allowing the UE to perform random access in the NR network and the LTE network. When the timer expires, the random access is considered to be failed. When the first time length is determined according to the calculation of the time length of the timer, if the first time length expires, the cell handover of the PSCell of the UE can be considered to be failed, the transmission of MCG failure information is abandoned, and RRC connection reestablishment is performed.

3. The T316 timer is used to indicate the failure time of the MCG, and when the T316 timer expires, the network instructs the UE to perform RRC connection reestablishment.

4. Based on the time required by the random access, the maximum occurrence number of the random access can be preset, and the time required by the total random access flow can be calculated by the notification of the network or the decision of the UE, so that the benefit is obtained.

In addition to the above examples, there are other methods to obtain the value of the first time length, so that the UE obtains the maximum benefit from MCG reconstruction under the PSCell handover condition. The UE and the network may also adjust the first duration according to actual network conditions, for example, when the network is congested, the first duration may be set to a larger value, and when the network is unobstructed, the value may be reduced.

Therefore, the UE waits for completion of the PSCell switching in the first time period and starts the failure information flow of the main cell group under the condition, so that the wireless link recovery speed of the main cell group is faster than the speed of triggering RRC connection reestablishment, and the service can be smoothly carried out. In addition, by setting the first duration, the UE can balance the waiting time under different network conditions, maximize the accelerating income and reduce the time delay of service recovery.

Fig. 9 is a schematic diagram of further refinement of the primary cell group failure procedure in the CBRA case, in which case time consumption is not only reduced by the first time-length help, but also by judging the success probability of this CBRA. The flow chart mainly comprises the following steps:

step 903, the UE receives a handover execution message from the secondary cell group, where the handover execution message is used to instruct cell handover to a target PSCell.

Step 904, radio link failure occurs between the UE and the primary cell group.

In step 905, the UE sends a random access preamble message to the target PSCell, where the random access preamble message is used to indicate synchronous access to the target PSCell.

Step 906, the UE triggers a comparator for comparing the target cell measurement information with a first threshold.

In step 907, when the target cell measurement information is greater than a first threshold, the UE starts a timer, which is set with a first duration.

Step 908, the UE receives a response message from the target PSCell within a first time period, where the response message is used to indicate that the handover to the target PSCell is successful.

Step 909, the UE sends primary cell group failure information for informing the network that the radio link between the UE and the MCG experiences failure.

As can be seen from the foregoing description of cell handover, before accessing a target cell, a UE needs to report a measurement report to a source cell, where the measurement report carries measurement information, and the measurement information may include: reference signal received power, reference signal received quality, etc. The energy of the target cell can generally be obtained from measurement information, wherein the higher the target cell energy, the higher and relatively more stable the channel quality between the target cell and the UE, so that the UE performs synchronization to the target cell with a higher CBRA success rate and a shorter time consumption. Therefore, the overall time consumption of the process is lower than the probability that the UE triggers the MCG reconstruction process, and benefits are obtained. By setting the first threshold, the UE determines that the success probability of the access procedure to the target cell is high when the energy of the target cell is higher than the first threshold. After that, the UE starts a timer set to a first duration. The value of the first time period may be referred to the foregoing embodiment. And triggering a failure information flow of the primary cell group when the UE receives the random access response message in the first time period. And when the UE does not receive the random access response message in the first time period, namely synchronous access of the UE to the target cell is not completed in the first time period, triggering the RRC connection reestablishment flow by the UE.

Even if the energy of the target cell is higher than the first threshold, that is, the channel between the UE and the target cell is relatively stable and the success probability of the access procedure is high, the situation of multiple retransmissions can still exist under the condition that the synchronous access mode is CBRA. In order to prevent the service from being put aside for a long time, a timer is set so that the UE can autonomously start the RRC connection reestablishment procedure when the random access response message is not received yet after the expiration of the first time period.

When the target cell energy is smaller than a first threshold, the channel between the UE and the target cell is unstable, so that the RRC connection reestablishment procedure is directly triggered. That is, the UE directly triggers the RRC connection reestablishment procedure by determining that the success probability of CBRA to synchronize with the target PSCell is low, so as to avoid the cost of waiting duration (i.e., the first time duration) of CBRA.

In this flow, the value of the first threshold may be from an empirical value.

From the above, the UE delays activating the RRC connection reestablishment procedure by estimating the success probability of the target cell (i.e., the comparison relation between the target cell energy and the first threshold) of the synchronous access, and preferably waits for the primary cell group failure information procedure to be executed after the CBRA is completed, so as to accelerate the recovery of the radio link between the UE and the MCG.

The following describes a wireless communication device provided in an embodiment of the present application.

Referring to fig. 10, which is a schematic block diagram of a wireless communication device according to an embodiment of the present application, the communication device 1000 includes a processing unit 1010 and a transceiver unit 1020, which are connected by a line. The wireless communication device is used for realizing the steps of the corresponding terminal in the above embodiments:

the processing unit 1010 is used for controlling the transceiver unit 1020 to perform communication with a network, for controlling a timing function, and the like.

And the transceiver unit 1020 is configured to receive the handover execution message and the first message, and send failure information of the primary cell group.

In a possible implementation method, the transceiver unit 1020 is further configured to send a radio resource control connection reestablishment message to the primary cell group when the first message is not received within a first time after the cell handover is performed; wherein the radio resource control connection reestablishment message is used to indicate to reestablish the radio link of the primary cell group, and the first time is configured.

In a possible implementation method, the transceiver unit 1020 is further configured to send a random access preamble message to the target secondary primary cell and receive a response message from the target secondary primary cell before receiving the first message; the random access preamble message is used for indicating random access to the target auxiliary main cell, and the response message is used for indicating success of random access to the target auxiliary main cell.

In one possible implementation method, the transceiver unit 1020 is further configured to send the radio resource control connection reestablishment message to the primary cell group if the measurement information of the target secondary primary cell is smaller than a first threshold in the case where the random access is a contention-based random access; wherein the measurement information is used to indicate a likelihood of successful random access to the target secondary primary cell.

In the above embodiments, the transceiver 1020 may be divided into a single receiver and a single transmitter, and each may have functions of receiving and transmitting, which is not limited herein.

Optionally, the communication device may further include a storage unit, where the storage unit is configured to store data or instructions (which may also be referred to as codes or programs), and the respective units may interact or be coupled with the storage unit to implement the corresponding methods or functions. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which may be in electrical, mechanical, or other forms for information interaction between the devices, units, or modules.

In this embodiment of the present application, the division of units in the communication device is merely a division of logic functions, and may be fully or partially integrated into one physical entity or may be physically separated. And the units in the communication device may all be implemented in the form of software calls via the processing element; or can be realized in hardware; it is also possible that part of the units are implemented in the form of software, which is called by the processing element, and part of the units are implemented in the form of hardware. For example, each unit may be a processing element that is set up separately, may be implemented integrally in a certain chip of the communication device, or may be stored in a memory in the form of a program, and the function of the unit may be called and executed by a certain processing element of the communication device. Furthermore, all or part of these units may be integrated together or may be implemented independently. The processing element described herein, which may also be referred to as a processor, may be an integrated circuit with signal processing capabilities. In implementation, each step of the above method or each unit above may be implemented by an integrated logic circuit of hardware in a processor element or in the form of software called by a processing element.

In one example, the unit in any of the above communication devices may be one or more integrated circuits configured to implement the above methods, such as: one or more specific integrated circuits (application specific integrated circuit, ASIC), or one or more microprocessors (digital signal processor, DSP), or one or more field programmable gate arrays (field programmable gate array, FPGA), or a combination of at least two of these integrated circuit forms. For another example, when the unit in the communication device may be implemented in the form of a processing element scheduler, the processing element may be a general purpose processor, such as a central processing unit (central processing unit, CPU) or other processor that may invoke the program. For another example, the units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Referring to fig. 11, a schematic structural diagram of a wireless communication device according to an embodiment of the present application is provided, where the wireless communication device may be a wireless communication device or a network device, or may be a chip or a circuit, for example, may be disposed on the chip or the circuit of the wireless communication device, and further, for example, may be disposed on the chip or the circuit of the network device, so as to implement the method in the foregoing method embodiment. As shown in fig. 11, the communication apparatus 1100 includes: processor 1110 and transceiver 1130, optionally, the communication device 1100 further includes a memory 1120, this memory 1120 not being necessary represented by a dashed box in the figure. The transceiver 1130 is used to enable communication with other devices. Wherein processor 1110, memory 1120, and transceiver 1130 are in communication with data through a bus implementation connection.

It should be appreciated that the processor 1110 may be a chip. For example, the processor 1110 may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated chip (application specific integrated circuit, ASIC), a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chip.

In implementation, the steps of the methods described above may be performed by integrated logic circuitry in hardware or instructions in software in processor 1110. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware processor execution or in a combination of hardware and software modules in the processor 1110. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 1120, and the processor 1110 reads information in the memory 1120 and performs the steps of the above method in combination with its hardware.

In particular, the functions of the processing unit 1010 in fig. 10 and the implementation procedure thereof can be implemented by the processor 1110 in the communication apparatus 1100 shown in fig. 11 calling computer executable instructions stored in the memory 1120. Alternatively, the functions/implementation of the transceiver unit 1020 in fig. 10 may be implemented by the transceiver 1130 in the communication apparatus 1100 shown in fig. 11.

It should be noted that the processor 1110 in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

In embodiments of the present application, memory 1120 may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

In the case where the communication device 1100 corresponds to the wireless communication device in the above-described method, the communication device may include a processor 1110, a transceiver 1130, and a memory 1320. The memory 1120 is configured to store instructions and the processor 1110 is configured to execute the instructions stored by the memory 1120 to implement steps performed by the wireless communication device in any one or more of the corresponding methods shown in fig. 6-7.

Those of ordinary skill in the art will appreciate that: the first, second, etc. numbers in the embodiments of the present application are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application, and indicate the sequence. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one" means one or more. At least two means two or more. "at least one," "any one," or the like, refers to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one of a, b, or c (species ) may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural. "plurality" means two or more, and the like.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The technical solution provided in the embodiments of the present application 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 loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a terminal device, a network device, an artificial intelligence device, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, 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 including one or more servers, data centers, etc. that can be integrated with the available medium. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

In the embodiments of the present application, the embodiments may be referred to each other, for example, methods and/or terms between method embodiments may be referred to each other, for example, functions and/or terms between apparatus embodiments and method embodiments may be referred to each other.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A method of wireless communication, comprising:

the method comprises the steps that a terminal receives a switching execution message sent by a secondary cell group in a double-connection state, wherein the switching execution message is used for indicating the terminal to conduct cell switching to a target auxiliary primary cell;

if the terminal receives a first message sent by the target auxiliary main cell under the condition that the main cell group in the double-connection state fails in radio link, sending main cell group failure information to a network through the target auxiliary main cell so as to indicate the network to trigger a main cell group quick reestablishment flow;

The first message is used for indicating that the terminal is successfully switched to the target auxiliary main cell.
The method as recited in claim 1, further comprising:

if the terminal does not receive the first message in the first time after executing the cell switching to the target auxiliary main cell, sending a radio resource control connection reestablishment message to the main cell group;

the radio resource control connection reestablishment message is used for indicating the network to reestablish the radio link of the main cell group.
The method according to claim 1 or 2, further comprising, prior to receiving the first message:

sending a random access preamble message to the target auxiliary main cell, wherein the random access preamble message is used for indicating random access to the target auxiliary main cell;

and receiving a response message from the target auxiliary main cell, wherein the response message is used for indicating that the random access to the target auxiliary main cell is successful.
A method according to claim 3, further comprising:

in the case that the random access is a contention-based random access, selectively transmitting the radio resource control connection reestablishment message to the primary cell group according to a measurement report by a terminal;

Wherein the measurement report includes measurement information to reflect the signal quality of the target secondary primary cell.
The method according to claim 4, wherein:

the terminal selectively sends the radio resource control connection reestablishment message to the main cell group according to a measurement report, and the method comprises the following steps:

and when the measurement information is lower than a preset first threshold value, sending the radio resource control connection reestablishment message to the main cell group.
The method according to claim 4 or 5, characterized in that:

the terminal selectively sends the radio resource control connection reestablishment message to the main cell group according to a measurement report, and the method further comprises the following steps:

and when the measurement information is not lower than a preset first threshold value, not immediately sending the radio resource control connection reestablishment message to the master cell group.
The method according to any one of claims 4 to 6, characterized in that:

the measurement information includes at least a received power of the downlink reference signal.
A wireless communications apparatus, comprising:

a processing unit and a receiving and transmitting unit;

the processing unit is used for:

receiving a switching execution message sent by a secondary cell group in a double-connection state through the receiving and transmitting unit, wherein the switching execution message is used for indicating cell switching to a target secondary primary cell;

If the receiving and transmitting unit receives a first message sent by the target auxiliary main cell under the condition that the main cell group in the double-connection state fails in radio link, the target auxiliary main cell sends main cell group failure information to a network so as to indicate the network to trigger a main cell group quick reestablishment flow;

the first message is used for indicating that the terminal is successfully switched to the target auxiliary main cell.
The apparatus of claim 8, wherein the transceiver unit is further configured to:

if the processing unit does not receive the first message in the first time after executing the cell switching to the target auxiliary main cell, sending a radio resource control connection reestablishment message to the main cell group;

the radio resource control connection reestablishment message is used for indicating the network to reestablish the radio link of the main cell group.
The apparatus according to claim 8 or 9, wherein the transceiving unit is further configured to:

before receiving the first message, sending a random access preamble message to the target auxiliary main cell, and receiving a response message from the target auxiliary main cell;

The random access preamble message is used for indicating random access to the target auxiliary main cell, and the response message is used for indicating success of random access to the target auxiliary main cell.
The apparatus of claim 10, wherein the processing unit is further configured to:

controlling the transceiver unit to selectively transmit the radio resource control connection reestablishment message to the primary cell group according to a measurement report when the random access is a contention-based random access;

wherein the measurement report includes measurement information to reflect the signal quality of the target secondary primary cell.
The apparatus according to claim 11, wherein:

the processing unit selectively sends the radio resource control connection reestablishment message to the primary cell group according to a measurement report, including:

and when the measurement information is lower than a preset first threshold value, controlling the receiving and transmitting unit to transmit the radio resource control connection reestablishment message to the main cell group.
The apparatus according to claim 11 or 12, characterized in that:

the processing unit selectively sends the radio resource control connection reestablishment message to the primary cell group according to a measurement report, including:

And when the measurement information is not lower than a preset first threshold value, not immediately sending the radio resource control connection reestablishment message to the master cell group.
The apparatus according to any one of claims 11 to 13, wherein:

the measurement information includes at least a received power of the downlink reference signal.
A wireless communications apparatus, comprising:

a processor and a memory, wherein the memory is for storing program instructions, the processor being for executing the program instructions in the memory to implement the method of any one of claims 1 to 7.
A wireless communications apparatus, comprising:

a processing circuit and an interface circuit; wherein,

the interface circuit is configured to couple with a memory external to the wireless communication device and provide a communication interface for the processing circuit to access the memory;

the processing circuitry is configured to execute program instructions in the memory to implement the method of any of claims 1 to 7.
A computer-readable storage medium, characterized by:

the computer readable storage medium having stored therein a program code which, when executed by a processor, implements the method of any of claims 1 to 7.
A computer program product, characterized by:

the computer program product comprising program code for implementing the method of any of claims 1 to 7 when executed by a processor.