CN117581596A

CN117581596A - Communication method and device based on dual-connectivity network

Info

Publication number: CN117581596A
Application number: CN202180099856.7A
Authority: CN
Inventors: 李海涛
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2024-02-20
Also published as: WO2023077393A1

Abstract

A communication method and device based on dual connectivity network are provided. The dual connectivity network includes a primary node and a secondary node, the method comprising: when the terminal device meets the low mobility criterion, the terminal device receives a first instruction from the primary node and/or the secondary node, the first instruction being used to instruct the terminal device to perform RLM relaxation and/or BFD relaxation. The embodiment of the application provides a scheme for performing RLM relaxation and/or BFD relaxation so as to realize the RLM relaxation and/or BFD relaxation of terminal equipment.

Description

Communication method and device based on dual-connectivity network

Technical Field

The present application relates to the field of communications technologies, and in particular, to a dual connectivity network-based communication method and apparatus.

Background

In order to ensure service continuity and communication quality of the terminal device, the terminal device needs to measure measurement resources of the network device. The terminal device measures the measurement resources and simultaneously increases the power consumption of the terminal device.

In order to reduce the power consumption of the terminal device, the concept of measurement relaxation is introduced in the protocol. Currently, protocols are ready to introduce radio link monitoring (radio link monitoring, RLM) relaxation and beam failure detection (beam failure detection, BFD) relaxation. However, under the dual connectivity (dual connectivity, DC) architecture, how RLM relaxation or BFD relaxation should be performed is a problem to be solved.

Disclosure of Invention

The application provides a communication method and device based on a dual-connectivity network, so as to solve the problems.

In a first aspect, a communication method based on a dual connectivity network, the dual connectivity network including a primary node and a secondary node, the method comprising: when the terminal device meets the low mobility criterion, the terminal device receives a first instruction from the primary node and/or the secondary node, the first instruction being used to instruct the terminal device to perform RLM relaxation and/or BFD relaxation.

In a second aspect, a communication method based on a dual connectivity network, the dual connectivity network including a primary node and a secondary node, the method comprising: when the terminal equipment meets the low mobility criterion, the master node sends a first instruction to the terminal equipment, wherein the first instruction is used for indicating the terminal equipment to perform RLM relaxation and/or BFD relaxation.

In a third aspect, a communication method based on a dual connectivity network, the dual connectivity network including a primary node and a secondary node, the method comprising: when the terminal equipment meets the low mobility criterion, the auxiliary node sends a first instruction to the terminal equipment, wherein the first instruction is used for indicating the terminal equipment to perform RLM relaxation and/or BFD relaxation.

In a fourth aspect, there is provided a communication apparatus based on a dual connectivity network including a primary node and a secondary node, the apparatus being applied to a terminal device, the apparatus comprising: and the receiving unit is used for receiving a first instruction from the main node and/or the auxiliary node when the terminal equipment meets the low mobility criterion, wherein the first instruction is used for indicating the terminal equipment to perform RLM relaxation and/or BFD relaxation.

In a fifth aspect, a dual connectivity network based communication apparatus, the dual connectivity network comprising a primary node and a secondary node, the apparatus being applied to the primary node, the apparatus comprising: and the sending unit is used for sending a first instruction to the terminal equipment when the terminal equipment meets the low mobility criterion, wherein the first instruction is used for indicating the terminal equipment to perform RLM relaxation and/or BFD relaxation.

In a sixth aspect, there is provided a dual connectivity network based communication apparatus comprising a primary node and a secondary node, the apparatus being applied to the secondary node, the apparatus comprising: and the sending unit is used for sending a first instruction to the terminal equipment when the terminal equipment meets the low mobility criterion, wherein the first instruction is used for indicating the terminal equipment to perform RLM relaxation and/or BFD relaxation.

In a seventh aspect, there is provided a dual connectivity network based communication apparatus for application to a terminal device, the apparatus comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method of the first aspect.

In an eighth aspect, there is provided a dual connectivity network based communication apparatus for use in a host node, the apparatus comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method of the second aspect.

In a ninth aspect, there is provided a dual connectivity network based communication apparatus for application to a secondary node, the apparatus comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method of the third aspect.

In a tenth aspect, there is provided an apparatus comprising a processor for calling a program from a memory to perform the method of the first aspect.

In an eleventh aspect, there is provided an apparatus comprising a processor for calling a program from a memory to perform the method of the second aspect.

In a twelfth aspect, there is provided an apparatus comprising a processor for calling a program from a memory to perform the method of the third aspect.

In a thirteenth aspect, there is provided a chip comprising a processor for calling a program from a memory, causing a device on which the chip is mounted to perform the method of the first aspect.

In a fourteenth aspect, there is provided a chip comprising a processor for calling a program from a memory, so that a device on which the chip is mounted performs the method of the second aspect.

In a fifteenth aspect, there is provided a chip comprising a processor for calling a program from a memory, causing a device on which the chip is mounted to execute the method of the third aspect.

In a sixteenth aspect, there is provided a computer-readable storage medium having stored thereon a program that causes a computer to execute the method of the first aspect.

In a seventeenth aspect, there is provided a computer-readable storage medium having stored thereon a program that causes a computer to execute the method of the second aspect.

In an eighteenth aspect, there is provided a computer-readable storage medium having stored thereon a program that causes a computer to execute the method of the third aspect.

In a nineteenth aspect, there is provided a computer program product comprising a program for causing a computer to perform the method of the first aspect.

In a twentieth aspect, there is provided a computer program product comprising a program for causing a computer to perform the method of the second aspect.

In a twenty-first aspect, there is provided a computer program product comprising a program for causing a computer to perform the method of the third aspect.

In a twenty-second aspect, there is provided a computer program for causing a computer to perform the method of the first aspect.

In a twenty-third aspect, there is provided a computer program for causing a computer to perform the method of the second aspect.

In a twenty-fourth aspect, there is provided a computer program for causing a computer to perform the method of the third aspect.

The embodiment of the application provides a scheme for performing RLM relaxation and/or BFD relaxation under a dual-connectivity network, namely, network equipment (a main node and/or an auxiliary node) decides whether the terminal equipment performs RLM relaxation and/or BFD relaxation or not, and notifies the terminal equipment to perform RLM relaxation and/or BFD relaxation in a command mode.

Drawings

Fig. 1 is an exemplary diagram of a wireless communication system to which embodiments of the present application apply.

Fig. 2 is a schematic diagram of a dual connectivity architecture as applied by embodiments of the present application.

Fig. 3 is a schematic flow chart of a communication method based on a dual connectivity network according to an embodiment of the present application.

Fig. 4 is a schematic flow chart of a communication method based on a dual connectivity network according to another embodiment of the present application.

Fig. 5 is a schematic flow chart of a communication method based on a dual connectivity network according to still another embodiment of the present application.

Fig. 6 is a schematic structural diagram of a dual connectivity network-based communication device according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a dual connectivity network-based communication device according to another embodiment of the present application.

Fig. 8 is a schematic structural diagram of a dual connectivity network-based communication apparatus provided in yet another embodiment of the present application.

Fig. 9 is a schematic structural diagram of a dual connectivity network-based communication apparatus provided in yet another embodiment of the present application.

Detailed Description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

Fig. 1 is a wireless communication system 100 to which embodiments of the present application apply. The wireless communication system 100 may include a network device 110 and a terminal device 120. Network device 110 may be a device that communicates with terminal device 120. Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices 120 located within the coverage area.

Fig. 1 illustrates one network device and two terminals, alternatively, the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within a coverage area, which is not limited in this embodiment of the present application.

Optionally, the wireless communication system 100 may further include a network controller, a mobility management entity, and other network entities, which are not limited in this embodiment of the present application.

It should be understood that the technical solution of the embodiments of the present application may be applied to various communication systems, for example: fifth generation (5th generation,5G) systems or New Radio (NR), long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD), and the like. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system, a satellite communication system and the like.

The Terminal device in the embodiments of the present application may also be referred to as a User Equipment (UE), an access Terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a Mobile Terminal (MT), a remote station, a remote Terminal, a mobile device, a user Terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the application can be a device for providing voice and/or data connectivity for a user, and can be used for connecting people, things and machines, such as a handheld device with a wireless connection function, a vehicle-mounted device and the like. The terminal device in the embodiments of the present application may be a mobile phone (mobile phone), a tablet (Pad), a notebook, a palm, a mobile internet device (mobile internet device, MID), a wearable device, a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in teleoperation (remote medical surgery), 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), or the like. Alternatively, the UE may be used to act as a base station. For example, the UEs may act as scheduling entities that provide side-uplink signals between UEs in V2X or D2D, etc. For example, a cellular telephone and a car communicate with each other using side-link signals. Communication between the cellular telephone and the smart home device is accomplished without relaying communication signals through the base station.

The network device in the embodiments of the present application may be a device for communicating with a terminal device, which may also be referred to as an access network device or a radio access network device, e.g. the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (radio access network, RAN) node (or device) that accesses the terminal device to the wireless network. The base station may broadly cover or replace various names in the following, such as: a node B (NodeB), an evolved NodeB (eNB), a next generation NodeB (gNB), a relay station, an access point, a transmission point (transmitting and receiving point, TRP), a transmission point (transmitting point, TP), a master MeNB, a secondary SeNB, a multi-mode wireless (MSR) node, a home base station, a network controller, an access node, a wireless node, an Access Point (AP), a transmission node, a transceiver node, a baseband unit (BBU), a remote radio unit (Remote Radio Unit, RRU), an active antenna unit (active antenna unit, AAU), a radio head (remote radio head, RRH), a Central Unit (CU), a Distributed Unit (DU), a positioning node, and the like. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip for placement within the aforementioned device or apparatus. The base station may also be a mobile switching center, a device-to-device (D2D), a vehicle-to-device (V2X), a device that assumes a base station function in machine-to-machine (M2M) communication, a network-side device in a 6G network, a device that assumes a base station function in a future communication system, or the like. The base stations may support networks of the same or different access technologies. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device.

The base station may be fixed or mobile. For example, a helicopter or drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In other examples, a helicopter or drone may be configured to function as a device to communicate with another base station.

In some deployments, the network device in embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

Network devices and terminal devices may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the device can be deployed on the water surface; but also on aerial planes, balloons and satellites. In the embodiment of the application, the scene where the network device and the terminal device are located is not limited.

It should be understood that all or part of the functionality of the communication device in this application may also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (e.g. a cloud platform).

With the pursuit of speed, delay, high speed mobility, energy efficiency and the diversity and complexity of future life services, the third generation mobile communication partner project (3rd generation partnership project,3GPP) international standards organization began to develop 5G. The main application scenarios of 5G may include: enhanced mobile ultra-wideband (enhance mobile broadband, emmbb), low latency high reliability communications (ultra reliable low latency communications, URLLC), and large scale machine type communications (massive machine type communication, mctc). The scheme of the embodiment of the application can be applied to any one of the scenes.

The main characteristic of the eMBB service is that the data volume is large and the transmission rate is high. When transmitting the data of the eMBB service, a time scheduling unit with a longer time is generally adopted to transmit the data so as to improve the data transmission efficiency. Typical eMBB traffic may include: ultra-high definition video, augmented reality (augmented reality, AR), virtual Reality (VR), and the like.

The main characteristics of the URLLC service are the requirement of ultra-high reliability and ultra-low latency, less data volume and burstiness. For example, the transmission delay requirement of URLLC traffic is typically within 0.5 milliseconds, regardless of reliability. On the premise that the reliability requirement reaches 99.999%, the transmission delay requirement of URLLC service is within 1 ms. Because of burstiness and randomness, the URLLC traffic may not generate packets for a long period of time, or may generate packets in a short period of time, which are in most cases small packets (e.g., 50 bytes in size). Typical URLLC traffic may include: wireless control in industrial manufacturing or production processes, motion control of unmanned vehicles or unmanned aircraft, remote repair, teleoperation, etc.

Typical characteristics of mctc may include: high connection density, small data volume, delay insensitive traffic, low cost and long service life of the module, etc. The scene is mainly oriented to the service of the Internet of things, and extremely high requirements are put on the access capability of the network.

Radio resource control (radio resource control, RRC) state

Currently, three RRC states of a terminal device are defined in the protocol: an RRC connected (rrc_connected) state, an RRC Idle (RRC-Idle) state, and an RRC Inactive (RRC-Inactive) state.

The rrc_connected state may refer to a state in which the terminal device is not RRC released after completing the random access procedure. An RRC connection exists between the terminal device and the network device (e.g., access network device). In the rrc_connected state, the terminal device may perform data transmission with the network device, for example, perform downlink data transmission and/or uplink data transmission. Alternatively, the terminal device may also perform transmission of a terminal device specific data channel and/or control channel with the network device to transmit specific information or unicast information of the terminal device.

In the rrc_connected state, the network device may determine location information of a cell level of the terminal device, that is, the network device may determine a cell to which the terminal device belongs. In the rrc_connected state, after the terminal device performs a location shift, for example, after moving from one cell to another cell, the network device may control the terminal device to perform a cell handover. It follows that mobility of the terminal device in rrc_connected state is mobility controlled by the network device, and the terminal device may switch to a specified cell according to an instruction issued by the network.

The RRC-Idle state refers to a state in which the terminal device resides in a cell, but is in when random access is not performed. The terminal device typically enters the RRC-Idle state after power-on, or after RRC release. In the RRC-Idle state, there is no RRC connection between the terminal device and the network device (e.g. the resident network device), the network device has no context of the terminal device stored, and no connection is established between the network device and the core network for the terminal device. If the terminal device needs to enter the RRC connected state from the RRC-Idle state, an RRC connection establishment procedure needs to be initiated.

In the RRC-Idle state, a Core Network (CN) may send a paging message to the terminal device, that is, the paging procedure may be triggered by the CN. Alternatively, the paging area may also be configured by the CN. In the RRC-Idle state, after a terminal device performs a location movement, for example, after moving from one cell to another cell, the terminal device may initiate a cell reselection. It follows that the mobility of the terminal device in RRC-Idle state is based on cell reselection of the terminal device.

The RRC-active state is a newly defined state for reducing air interface signaling, fast recovery of radio connections, and fast recovery of data traffic. The rrc_inactive state is a state between the connected state and the idle state. The terminal device has previously entered the RRC connected state and then released the RRC connection with the network device, but the network device maintains the context of the terminal device. In addition, the connection established by the network device with the core network for the terminal device is not released, i.e. the user plane bearer and the control plane bearer between the RAN and the CN are maintained, i.e. there is a connection of the CN-NR.

In the RRC-active state, the RAN may send a paging message to the terminal device, that is, the paging procedure may be triggered by the RAN. The RAN-based paging area is managed by the RAN and the network device is able to know that the location of the terminal device is based on the RAN paging area level.

In the RRC-active state, after the terminal device performs a position movement, for example, moving from one cell to another cell, the terminal device may initiate a cell reselection. It follows that the mobility of the terminal device in the RRC-Inactive state is based on cell reselection of the terminal device.

Radio resource management (radio resource management, RRM) measurement relaxation

As is apparent from the above description, a terminal device may move from the coverage of one cell to the coverage of another cell due to the mobility of the terminal device. In order to ensure service continuity and communication quality of the terminal device, the terminal device may perform RRM measurement, thereby implementing cell reselection (reselection) or cell handover (handover).

For the terminal equipment in the RRC-Inactive state and the RRC-Idle state, the terminal equipment can perform RRM measurement and perform cell reselection based on the RRM measurement result. For the terminal device in rrc_connected state, the terminal device may perform RRM measurement and report the measurement result to the network device. The network device may control the terminal device to perform cell handover based on the signal measurement result.

When performing RRM measurement, the terminal device may perform RRM measurement on a plurality of cells (such as a serving cell and at least one neighbor cell) to obtain signal measurement results of the plurality of cells. The signal measurements of the plurality of cells may be used for cell reselection or cell handover. For example, when performing cell reselection, the terminal device may select a cell with good signal quality for access. For another example, in performing cell handover, the terminal device may handover from the serving cell to a target cell with better signal quality.

The RRM measurements may be RRM measurements based on synchronization/physical broadcast channel blocks (SSBs) and/or channel state information reference signals (CSI-RS). The network device may configure SSB and/or CSI-RS resources of a plurality of cells for the terminal device, and the terminal device may measure the plurality of cells to obtain signal measurement results of the plurality of cells.

The signal measurement results may include at least one of a measurement result of reference signal received power (reference signal receiving power, RSRP), a measurement result of reference signal received quality (reference signal receiving quality, RSRQ), and a measurement result of signal-to-interference-and-noise ratio (SINR). It will be appreciated that the signal measurements of a cell may be used to characterize the signal quality of that cell.

In order to ensure service continuity and communication quality of the terminal device, the terminal device needs to continuously perform RRM measurement, for example, the terminal device periodically performs RRM measurement on a plurality of cells. Accordingly, there is some power consumption of the terminal device. However, in some scenarios, such as when the terminal device is not substantially moving, or when the terminal device is in a central location of a cell, the terminal device does not have much need for cell handover or cell reselection, and if the terminal device is still continuously performing RRM measurements, it is undoubtedly a waste of power for the terminal device.

Based on the above considerations, in order to reduce the power consumption of the terminal device, a power saving technique is introduced in the communication system, and the concept of RRM measurement relaxation (RRM measurement relax) is proposed. RRM measurement relaxation may also be referred to as neighbor measurement relaxation, or neighbor RRM measurement relaxation. There are various implementation manners of RRM measurement relaxation, and embodiments of the present application are not limited in this regard. For example, the terminal device may implement RRM measurement relaxation by increasing the period of RRM measurement (i.e., reducing the number of RRM measurements). As another example, the terminal device may implement RRM measurement relaxation by reducing the number of measured neighbor cells. For another example, the terminal device may implement RRM measurement relaxation by reducing the number of measured frequency points.

For RRM measurement relaxation of the terminal device in RRC-Idle state and RRC-Inactive state, two criteria are defined in the protocol, a non-cell-edge criterion and a low-mobility criterion, respectively. The terminal device may determine whether it meets the non-cell-edge criterion and/or the low-mobility criterion based on the signal measurement result. The terminal device may perform RRM measurement relaxation in case the terminal device satisfies the non-cell-edge criterion and/or the low-mobility criterion.

The non-cell-edge criterion is mainly used to determine whether the terminal device is at the edge cell location of the serving cell. If the terminal equipment is positioned at the non-edge cell position of the service cell, the requirement of the terminal equipment on cell reselection is not great, RRM measurement can be relaxed, and the purpose of energy saving of the terminal equipment is achieved. If the terminal device is located at the edge cell position of the service cell, the terminal device has a larger requirement for cell reselection, and the terminal device can not relax RRM measurement.

The non-cell-edge criterion defines mainly the threshold value of the signal measurement. By comparing the signal measurements with the threshold value, it can be determined whether the terminal device is in a non-edge cell location. For example, if the signal measurement result is greater than the threshold value, it indicates that the terminal device is at a non-edge cell location of the serving cell; and if the signal measurement result is smaller than or equal to the threshold value, indicating that the terminal equipment is at the edge cell position of the service cell.

The non-cell-edge criterion is described below taking as an example the signal measurements RSRP and RSRQ. The network device may define two threshold values s-searchthreshold and s-searchthreshold q for the non-cell-edge criterion by configuring a cell edge evaluation (celledge evaluation) parameter to the terminal device. Wherein s-SearchThresholdP is the measurement threshold value of RSRP, and s-SearchThresholdQ is the measurement threshold value of RSRQ. The terminal device may measure the RSRP and RSRQ of the serving cell to obtain a measured value of the RSRP and a measured value of the RSRQ of the serving cell. When the measured value of the RSRP of the serving cell is greater than s-SearchThreshold P and the measured value of the RSRQ is greater than s-SearchThreshold Q, the terminal device meets the non-cell-edge criterion, and the terminal device can perform RRM measurement relaxation.

Of course, the network device may also configure only one of the parameters s-SearchThresholder P and s-SearchThresholder Q. For example, the network device may configure s-searchthreshold only and not s-searchthreshold q, in which case the terminal device may measure only the RSRP of the serving cell. When the measured value of the RSRP of the serving cell is larger than s-SearchThreshold, the terminal equipment meets the non-cell-edge criterion, and the terminal equipment can perform RRM measurement relaxation. For another example, the network device may configure only s-searchthreshold q and not s-searchthreshold p, in which case the terminal device may measure only RSRQ of the serving cell. When the measured value of the RSRQ of the serving cell is larger than s-SearchThreshold Q, the terminal device meets the non-cell-edge criterion, and the terminal device can perform RRM measurement relaxation.

The low-mobility criterion is mainly used to determine whether the terminal device is in a low mobility state. If the terminal device is in a low mobility state, i.e. the location of the terminal device is relatively fixed, the terminal device has little need for cell reselection, and the terminal device can perform RRM measurement relaxation. If the terminal device is in a high mobility state, i.e. the position of the terminal device changes greatly, the terminal device has a larger need for cell reselection, and the terminal device may not relax RRM measurements.

Whether the terminal device is in a low mobility state may be determined based on the signal quality of the serving cell. For example, the terminal device may measure the signal quality of the serving cell at different times. If the signal quality of the serving cell changes little at different times, i.e. the signal quality of the serving cell is relatively stable, it is indicated that the terminal device is in a low mobility state.

The signal quality of the serving cell may be represented by at least one of the following information: RSRP, RSRQ, SINR. Taking RSRP as an example, the terminal device may measure the RSRP of the serving cell. If the RSRP of the serving cell changes little, it indicates that the terminal device is in a low mobility state, and the terminal device can make RRM measurements relaxed.

For the low-mobility criterion, the terminal device may determine whether the low-mobility criterion is satisfied by judging whether the low-mobility criterion parameter is satisfied. Currently, two low mobility criterion parameters t-SearchDeltaP and s-SearchDeltaP are defined in the protocol. If the signal quality of the serving cell is smaller than the threshold value s-SearchDeltaP in the t-SearchDeltaP time, the terminal equipment can perform RRM measurement relaxation, wherein the signal quality of the serving cell is smaller than the threshold value s-SearchDeltaP, and the signal quality of the serving cell is smaller than the threshold value s-SearchDeltaP in the t-SearchDeltaP time.

If the terminal device is configured with the non-cell-edge criterion and the low-mobility criterion at the same time, the network device may also notify the terminal device of a trigger condition for RRM measurement relaxation, and the terminal device may perform RRM measurement relaxation if the trigger condition is satisfied. The trigger condition may be satisfaction of a non-cell-edge criterion and/or a low-mobility criterion. For example, the network device may indicate to the terminal device the relationship of the non-cell-edge criterion and the low-mobility criterion, e.g., the network device may indicate whether the two are in a "and" relationship or in a "or" relationship. If the two are in the sum relationship, the terminal equipment needs to meet the non-cell-edge criterion and the low-mobility criterion at the same time so as to relax the RRM measurement. If the two are in an OR relationship, the RRM measurement relaxation can be performed as long as the terminal equipment meets any one of the criteria (such as the non-cell-edge criterion or the low-mobility criterion).

In other measurement scenarios, such as RLM and BFD, there is also some power consumption of the terminal device. In order to further reduce the power consumption of the terminal equipment and achieve the purpose of energy conservation, measurement relaxation can be carried out on the measurement scenes. RLM and BFD are described below, respectively.

RLM

RLM may refer to a terminal device monitoring the channel quality of the downlink of a serving cell in an rrc_connected state. After the terminal device establishes RRC connection with the network device, RLM measurement can be performed to maintain the link state, so as to ensure successful data transmission. In a mobile communication system, quality of a radio link (radio link) between a terminal device and a network device may be good or bad due to movement of the terminal device, change of environment, and the like. To ensure the stability of the communication, the terminal device needs to continuously monitor the quality of the radio link, which process may be referred to as radio link monitoring.

The purpose of RLM is to change cells when the current serving cell (serving cell) quality is not appropriate. The basic mechanism is that the network configures the terminal device with reference signals (i.e. monitoring resources) for RLM, and the terminal device continuously monitors these RLM resources and determines whether a problem occurs in the radio link according to a certain rule. Among them, reference Signals (RSs) for RLM may be SSB and/or CSI-RS, etc.

Regarding RLM measurement, a Physical (PHY) layer inside a terminal device may detect signal quality, and a higher layer inside the terminal device, such as a medium access control (medium access control, MAC) layer, may determine a state of a radio link according to the signal quality. The specific behavior may be as follows:

1. the physical layer may detect the RLM-RS to determine the downlink radio link quality. The terminal device may estimate the downlink quality, e.g., estimate the block error rate (block error ratio, BLER) of the downlink, based on at least one of RSRP, RSRQ, SINR of the RLM-RS. If all downlink radio link quality results for RLM-RS measurements are below a threshold Qout, the physical layer may send out-of-sync indication information to higher layers. If the downlink radio link quality result measured by the at least one RLM-RS is higher than the threshold value Qin, the physical layer may transmit synchronization indication (in-sync indication) information to a higher layer.

Qin and Qout represent threshold values for BLER of the physical downlink control channel (physical downlinkcontrol channel, PDCCH). The terminal device may detect the BLER of the PDCCH (e.g., BLER of PDCCH formats 1-0) and compare with Qin and Qout to determine whether the terminal device is in a synchronized state or an out-of-synchronization state.

Qin and Qout may be configured separately for each cell (per cell), or a group of Qin and Qout may be shared by a plurality of cells. The terminal device may determine Qin and Qout corresponding to the serving cell according to the current serving cell to perform radio link monitoring.

The values of Qin and Qout may be network device configured, or-they may also be default values in the protocol. For example, the network device may configure Qin and Qout for the terminal device through RRC signaling, which the terminal device may determine. For another example, qin and Qout may also be default values in the protocol, e.g., qout may be 10% default and Qin may be 2% default. Alternatively, if the network device configures Qin and Qout for the terminal device, the terminal device may use the configured Qin and Qout to make a synchronization or out-of-synchronization judgment; if the network device does not configure Qin and Qout for the terminal device, the terminal device may use the default Qin and Qout in the protocol to make a synchronization or out-of-synchronization determination.

2. The higher layers determine the status of the wireless link. When the higher layer receives N310 out-of-sync indications continuously indicated by the physical layer and none of the timers T310, T301, T304, T311 of the terminal device is running, the timer T310 is started, and at this time, the terminal device can be considered to detect a physical layer problem. In the running process of the timer T310, that is, before the timer T310 times out, when the higher layer receives N311 in-sync indications continuously indicated by the physical layer, the timer T310 is stopped, and at this time, the terminal device can be considered to recover from the physical layer problem, such as recovering downlink synchronization. When the timer T310 expires, the higher layer does not continuously receive N311 in-sync indications from the physical layer, and at this time, the terminal device may be considered to be in a downlink out-of-step state, i.e., the terminal device has radio link failure (radio link failure, RLF).

The timer parameters T310, T301, T304, T311 and/or the constant parameters N310, N311 may be configured by the network device to the terminal device through dedicated signaling, or may be configured to the terminal device through system broadcasting. For example, the network device may configure the terminal device with parameters RLF timer and constant (RLF-TimersAndConstants IE) via dedicated signaling, which parameters RLF-TimersAndConstants IE include the timer parameters and constant parameters described above. For another example, the network device may configure parameters UE timer and constant (UE-TimersAndConstants IE) for the terminal device through system broadcast (e.g., SIB 1), the UE-TimersAndConstants IE including the timer parameters and constant parameters described above. Alternatively, if the network device configures the terminal device with RLF-TimersAndConstants IE through dedicated signaling, the terminal device may preferentially use parameters in RLF-TimersAndConstants IE; if the network device does not configure the terminal device with RLF-TimersAndConstants IE through dedicated signaling, the terminal device may use the parameters in ue-TimersAndConstants IE.

BFD

BFD may refer to the terminal device monitoring the quality of the beam in the RRC connected state. The purpose of BFD is to perform beam restoration and change the beam when the current beam quality is not appropriate. The basic mechanism may be that the network device configures the terminal device with reference signals (i.e. monitoring resources) for BFD, and the terminal device continuously monitors the monitoring resources for BFD and determines whether a beam has a problem according to a certain rule.

The monitoring resources for BFD may be SSB resources and/or CSI-RS resources. The terminal device may perform beam failure detection and beam failure recovery procedures based on parameters configured by the network device. Beam failure detection may refer to the terminal device detecting beam failure on the SSB and/or CSI-RS of the current serving cell. Beam failure recovery is used for the terminal device to indicate a new SSB/CSI-RS to the serving cell. The specific behavior may be as follows:

physical layer operation: the network device configures SSB resources and/or CSI-RS resources for beam failure detection to the terminal device through RRC signaling, and configures a parameter BFI maximum (beamfailureitmamxcount) and a BFD timer (beamfailuredetection timer). The physical layer continuously performs measurement and evaluation on BFD monitoring resources according to a specified evaluation period. When the quality of all BFD resources is below a given threshold Qout, the physical layer sends a beam failure instance (beam failure instance, BFI) indication to the MAC layer.

High-level operation: the higher layer considers that the beam has a problem when receiving the BFI indication, starts or restarts a BFD timer (beamfailuredetection timer), accumulates 1 a BFI COUNTER (bfi_counter), and accumulates the number of received BFIs. If BFI_COUNTER is greater than or equal to the parameter BFI maximum (beamFailureInstanceMaxCount), a beam failure recovery (beam failure recovery, BFR) process is triggered. The terminal device may initiate a random access procedure for beam failure recovery. For example, the terminal device may initiate a random access procedure in a primary cell (PCell) or a primary secondary cell (primary secondary cell, spCell). And if the beamejurydetection timer times out, or the terminal equipment receives the reconfiguration of at least one parameter of the parameters SSB/CSI-RS resource, the beamejuryvanceMaxCount and the beamejurydetection timer for beam failure detection, resetting the BFI_COUNTER to zero.

If the terminal device random access is successful, the BFI_COUNTER may be reset to zero, the beam failure detection timer is stopped, and the beam failure recovery procedure is considered to be successfully completed.

In order to ensure the communication quality of the terminal device, the terminal device may perform periodic measurement on the RLM and the BFD, and accordingly, the terminal device has corresponding power consumption. In order to reduce the power consumption of the terminal equipment, a scheme for measuring and relaxing RLM and BFD is introduced into the protocol.

The scheme of measurement relaxation for RLM and BFD is applicable to various network architectures. Such as DC architecture, carrier aggregation (carrier aggregation, CA) architecture, stand alone networking (SA) architecture, etc. The DC architecture may include, for example, at least one of the following: EN-DC, NE-DC and NR-DC. The CA architecture may include, for example, at least one of the following: NR intra-band CA, NR inter-band CA. The SA architecture may be, for example, NR SA. The DC architecture is described below by taking the DC architecture as an example.

DC architecture

In some communication systems (e.g., 5G systems), the deployment of the network may include two types. One is the SA mode, i.e. the 5G base station is directly connected to the core network and can operate independently. Another non-independent deployment (NSA) mode, i.e. the 5G base station is not directly connected to the core network, requires access to the core network by base stations that rely on other communication systems, such as 4G base stations. In NSA mode, the terminal device may communicate with a 4G base station or a 5G base station, also referred to as DC mode.

The DC mode may enhance mobility performance of the network and increase user throughput. In this architecture, the terminal device may simultaneously maintain connection with two base stations (e.g., a 5G base station and a 4G base station), where one base station may be referred to as a master base station or a Master Node (MN) and the other base station may be referred to as a secondary base station or a Secondary Node (SN).

The dual-connection architecture of the communication system can be classified into EN-DC architecture, NE-DC architecture, NR-DC architecture, etc. according to the permutation and combination of different air interfaces and core networks, and the radio access technology applied by the dual-connection Control Plane (CP). Wherein E stands for evolved universal terrestrial radio access (evolveduniversal terrestrial radio access, E-UTRA), i.e. 4G radio access network; n represents NR, i.e. 5G new radio.

The DC architecture of the embodiments of the present application is described below in conjunction with fig. 2. Under the dual connectivity architecture, the connected terminal device is configured with one primary cell group (master cell group, MCG) and one secondary cell group (secondary cell group, SCG). The cell under the primary node may be referred to as MCG and the cell under the secondary node may be referred to as SCG. Wherein, the MCG may refer to a group where a cell where the terminal device initiates random access first is located.

Under MCG, there may be many cells. The cell used to initiate the initial access may be referred to as a primary cell (PCell). PCell is the most dominant cell within MCG. The MCG may also include one or more secondary cells (scells). The PCell under MCG and SCell under MCG may be joined together by CA technology.

Similarly, there will be one of the most dominant cells under SCG, called primary and secondary cells (primary secondary, PSCell). The PSCell may be understood as a cell initiating initial access under SCG. The SCG may also include one or more scells. The PSCell under SCG and Scell under SCG may be joined together by CA technology.

Since much signaling is only sent on PCell and PSCell, PCell and PSCell may be collectively referred to as sPCell hereinafter for convenience of description. In other words, sPCell hereinafter may denote PCell and/or PScell.

Based on the foregoing description, a key factor for determining whether the terminal device performs measurement relaxation is: whether the terminal device is in a low mobility state. However, under the DC architecture, there is no clear solution for how a network device (such as a primary node and/or a secondary node) obtains the mobile status of a terminal device.

In order to solve the above problems, the present application provides a communication method based on dual connectivity. The embodiment of the application provides a scheme for performing RLM relaxation and/or BFD relaxation under a dual connectivity network, namely, when a terminal device meets a low mobility criterion, the network device (a main node and/or an auxiliary node) instructs the terminal device to perform RLM relaxation and/or BFD relaxation through a first instruction. The first instruction may be derived based on the first information. The first information may be used to indicate that the terminal device meets a low mobility criterion. The first information may be determined by the terminal device and sent to the primary node and/or the secondary node. For example, in some embodiments, before receiving the first instruction, the terminal device may first determine whether the terminal device meets the low mobility criterion, and in case that the low mobility criterion is met, send the first information to the primary node and/or the secondary node, so that the primary node and/or the secondary node knows whether the terminal device is in the low mobility state. Alternatively, in other embodiments, the first information may be autonomously determined by the primary node and/or the secondary node.

The following describes in detail a communication method based on dual connectivity provided in the embodiment of the present application with reference to fig. 3. The dual connectivity network may include a primary node and a secondary node. The method shown in fig. 3 includes steps S310 to S330. Steps S310 to S320 describe a procedure in which the terminal device determines and transmits first information (indicating that the terminal device satisfies the low mobility criterion) to the network device (primary node and/or secondary node). In some embodiments, steps S310-S320 may be omitted. In this case, it may be autonomously determined by the network device whether the terminal device is in a low mobility state.

In step S310, the terminal device determines whether the terminal device satisfies a low mobility criterion.

The low mobility criterion may be judged in a similar manner as the low mobility criterion in RRM measurement relaxation described above. For example, the terminal device may evaluate signal measurements of the serving cell (e.g., primary cell and/or primary secondary cell) to determine whether the terminal device meets the low mobility criterion.

In some embodiments, the terminal device may make measurements of cells (e.g., primary or secondary cells) in the MCG and determine whether the terminal device meets the low mobility criterion based on the signal measurements. For example, the terminal device may make measurements of the primary cell in the MCG and determine whether the terminal device meets the low mobility criterion based on the signal measurements of the primary cell, that is, whether the low mobility criterion is met may be determined by the terminal device to the signal measurements of the primary cell.

In other embodiments, the terminal device may measure cells (e.g., primary or secondary cells) in the SCG and determine whether the terminal device satisfies the low mobility criterion based on the signal measurement results. For example, the terminal device may measure the primary and secondary cells in the SCG and determine whether the terminal device meets the low mobility criterion based on the signal measurements of the primary and secondary cells, that is, whether the low mobility criterion is met may be determined by the terminal device to the signal measurements of the primary and secondary cells.

Taking the primary cell and the secondary cell as examples, the terminal device may evaluate only the signal measurement results of the primary cell, or the terminal device may evaluate only the signal measurement results of the secondary cell, or the terminal device may evaluate both the signal measurement results of the primary cell and the secondary cell.

In evaluating the signal measurements, the terminal device may evaluate the signal measurements of the primary cell and/or the primary and secondary cells using the low mobility criterion parameter. The low mobility criterion parameters may include t-SearchDeltaP and s-SearchDeltaP. The terminal device can judge whether the signal measurement result of the primary cell and/or the primary and secondary cells is smaller than the threshold value s-SearchDeltaP in the time of t-SearchDeltaP. If the signal measurement result of the primary cell and/or the primary and secondary cells is smaller than the threshold value s-SearchDeltaP in the t-SearchDeltaP time, the terminal equipment determines that the terminal equipment meets the low mobility criterion. If the signal measurement result of the primary cell and/or the primary and secondary cells is not smaller than the threshold value s-SearchDeltaP within the t-SearchDeltaP time, the terminal equipment determines that the terminal equipment does not meet the low mobility criterion.

The low mobility criterion parameters of the primary cell and the secondary cell may be the same or different. For example, the terminal device may evaluate the signal measurements of the primary and secondary cells, respectively, using the same low mobility criterion parameters. As another example, the terminal device may evaluate the signal measurements of the primary and secondary cells, respectively, using different low mobility criterion parameters.

In some embodiments, the low mobility criterion parameters of the primary cell and the secondary cell may be configured by the same node. For example, the low mobility criterion parameters of the primary cell and the secondary cell are both configured by the primary node, or the low mobility criterion parameters of the primary cell and the secondary cell are both configured by the secondary node. In other embodiments, the low mobility criterion parameters of the primary cell and the secondary cell may be configured by different nodes. For example, the low mobility criterion parameters of the primary cell are configured by the primary node and the low mobility criterion parameters of the secondary cell are configured by the secondary node.

The low mobility criterion parameter may be configured by the primary node, by the secondary node, or by both the primary and secondary nodes. As shown in fig. 4 and 5, the master node may send the low mobility criterion parameter to the terminal device in step S305, i.e. the low mobility criterion parameter may be configured by the master node.

The terminal device may use the low mobility criterion parameter to evaluate the signal measurements of the primary cell if the low mobility criterion parameter is configured by the primary node. The terminal device may use the low mobility criterion parameter to evaluate the signal measurements of the primary and secondary cells if the low mobility criterion parameter is configured by the secondary node.

For example, the master node may configure the terminal device with first low mobility criterion parameters including t-SearchDeltaP1 and s-SearchDeltaP 1. Further, the terminal device may measure the signal of the primary cell, and determine whether the terminal device meets the low-mobility criterion based on the signal measurement result of the primary cell. If the signal measurement result of the primary cell is smaller than the threshold value s-SearchDeltaP 1 in the time t-SearchDeltaP1, the terminal equipment is indicated to meet the low mobility criterion. Otherwise, the terminal device does not meet the low mobility criterion.

The secondary node may configure the terminal device with second low mobility criterion parameters including t-SearchDeltaP2 and s-SearchDeltaP 2. Further, the terminal device may measure the signal of the secondary cell, and determine whether the terminal device meets the low-mobility criterion based on the signal measurement result of the secondary cell. If the signal measurement result of the secondary cell is smaller than the threshold value s-SearchDeltaP 2 in the time t-SearchDeltaP2, the terminal equipment is indicated to meet the low mobility criterion. Otherwise, the terminal device does not meet the low mobility criterion.

The terminal device may determine that the terminal device satisfies the low mobility criterion in a case where a signal measurement result of one of the primary cell and the secondary cell satisfies the determination condition. Alternatively, the terminal device may determine that the terminal device satisfies the low mobility criterion when the signal measurement results of the primary cell and the secondary cell satisfy the determination condition at the same time. The embodiment of the present application is not particularly limited thereto. The decision condition here may refer to the signal measurement being less than the threshold s-SearchDeltaP for a time t-SearchDeltaP.

The low mobility criterion parameter may be configured by the network device through a signaling radio bearer (signaling radio bearer, SRB), which may be, for example, at least one of SRB1, SRB2 and SRB 3. For example, the low mobility criterion parameter may be configured by the primary node through SRB1, or the low mobility criterion parameter may be configured by the secondary node through SRB1 or SRB 2.

The signal measurement result in the embodiment of the present application may include at least one of the following: measurement of RSRP, measurement of RSRQ, and measurement of SINR.

In step S320, if the terminal device satisfies the low mobility criterion, the terminal device may transmit first information to at least one of the primary node and the secondary node. The first information indicates that the terminal device satisfies a low mobility criterion. The first information may be used by the primary node and/or the secondary node to determine whether to perform RLM relaxation and/or BFD relaxation.

In some embodiments, the terminal device may send the first information to the primary node or the secondary node only if the low mobility criterion is met. That is, if the terminal device does not satisfy the low mobility criterion, the terminal device may not transmit the first information to the primary node or the secondary node. After receiving the first information sent by the terminal device, the primary node or the secondary node can determine that the terminal device is in a low-mobility state.

In some embodiments, the terminal device may also send the first information to the primary node and the secondary node at the same time, so that the primary node and the secondary node can timely learn the movement state of the terminal device. If the terminal equipment sends the first information to the main node and the auxiliary node, the terminal equipment can send the first information to the main node and the auxiliary node simultaneously, or can send the first information to the main node and the auxiliary node successively.

In other embodiments, the terminal device may send the first information to the primary node, so that the primary node sends the first information to the secondary node; alternatively, the terminal device may send the first information to the secondary node, so that the secondary node sends the first information to the primary node. Of course, in some embodiments, the node receiving the first information may also choose not to send the first information to another node, in which case the decision whether the terminal device performs RLM relaxation and/or BFD relaxation may be made independently by the node receiving the first information. The implementation manner provided by the embodiment can save air interface overhead.

The terminal device may transmit the first information to a node configuring the low mobility criterion parameter when transmitting the first information to the primary node or the secondary node. For example, if the low mobility criterion parameter is configured by the master node, the terminal device may send the first information to the master node. For another example, if the low mobility criterion parameter is configured by the secondary node, the terminal device may send the first information to the secondary node. For another example, if the low mobility criterion parameter is configured by the primary node and the secondary node, the terminal device may send the first information to both the primary node and the secondary node.

The method for transmitting the first information between the primary node and the secondary node is not particularly limited in the embodiments of the present application. As one example, the first information may be transmitted between the primary node and the secondary node through RRC signaling. The RRC signaling may be, for example, an inter-node message. The inter-node message may be, for example, cell group configuration information (cell group configuration information, CG-configmfo) or secondary cell group configuration information (secondary cell group configuration information, SCG-configmfo), etc. As another example, the first information may be transmitted between the primary node and the secondary node via Xn application protocol (Xn application protocol, xnAP) messages.

In some embodiments, the first information may be included in a first message. The first message may be a measurement report message, or the first message may be a UE assistance information (UE assistance information) message. In other words, the terminal device may report the first information using a MeasurementReport message, or the terminal device may report the first information using a ueassistance information message.

The first message may be carried in an SRB. For example, the first message may be carried in SRB1 or SRB 3. For example, the terminal device may transmit the first information to the MN through the SRB 1. For another example, the terminal device may send the first information to the SN through SRB1 or SRB 3.

Based on the foregoing, it can be seen that the signal quality of the serving cell is also a key factor affecting whether the terminal device performs measurement relaxation. The method for the primary node and/or the secondary node to acquire the signal quality of the serving cell is not particularly limited in the embodiments of the present application. In some embodiments, the primary node and/or the secondary node may obtain the signal quality of the serving cell based on RRM measurements. The terminal device may perform RRM measurement on the serving cell, and report the RRM measurement result to the primary node and/or the secondary node. Since the RRM measurement result includes the signal quality of the serving cell and the signal quality of at least one neighboring cell, the primary node and/or the secondary node may determine the signal quality of the serving cell based on the RRM measurement result. In other embodiments, the terminal device may send the signal quality of the serving cell to the primary node and/or the secondary node. For example, the terminal device may transmit the signal quality of the serving cell to the primary node and/or the secondary node while transmitting the first information to the primary node and/or the secondary node.

The serving cell in the embodiment of the present application may be any cell in a primary cell group, for example, a primary cell or a secondary cell in the primary cell group; alternatively, the serving cell may be any one of a secondary cell group, such as a primary secondary cell or a secondary cell in a secondary cell group.

The terminal device may send the signal quality of the serving cell to the primary node and/or the secondary node simultaneously with the first information, in other words, the first information and the signal quality of the serving cell may be carried in the same message. For example, if the first information is included in the first message, the first message may further include second information for indicating a signal quality of a serving cell of the terminal device.

The second information may include signal measurements of at least one cell in the primary cell group and/or signal measurements of at least one cell in the secondary cell group. The signal measurement result of at least one cell in the primary cell group may include at least one of the following information: signal measurements of the primary cell, signal measurements of one or more secondary cells in the primary cell group. The signal measurement result of at least one cell in the secondary cell group may include: signal measurement results of primary and secondary cells, signal measurement results of one or more secondary cells in the secondary cell group. That is, the second information may include at least one of the following information: signal measurements of the primary cell, signal measurements of one or more secondary cells in the primary cell group, signal measurements of the primary and secondary cells, or signal measurements of one or more secondary cells in the secondary cell group.

For convenience of description, the signal measurement result of at least one cell in the primary cell group is hereinafter referred to as a signal measurement result of the primary cell group, and the signal measurement result of at least one cell in the secondary cell group is hereinafter referred to as a signal measurement result of the secondary cell group.

If the terminal device only transmits the first information to the primary node, the terminal device may transmit the signal measurement result of the primary cell group and the signal measurement result of the secondary cell group to the primary node. The master node may send the signal measurements of the secondary cell group to the secondary node. For example, as shown in fig. 5, in step S326, the terminal device may transmit the first information, the signal measurement result of the primary cell, the signal measurement result of the primary and secondary cells, the signal measurement result of the secondary cell in the MCG, and the signal measurement result of the secondary cell in the SCG to the primary node. In step S328, the primary node may transmit the first information, the signal measurement result of the primary and secondary cells, and the signal measurement result of the secondary cell in the SCG to the secondary node.

If the terminal device only transmits the first information to the secondary node, the terminal device may transmit the signal measurement result of the primary cell group and the signal measurement result of the secondary cell group to the secondary node. The secondary node may send the signal measurements of the primary cell group to the primary node. For example, the terminal device may transmit the first information, the signal measurement result of the primary cell, the signal measurement result of the primary and secondary cells, the signal measurement result of the secondary cell in the MCG, and the signal measurement result of the secondary cell in the SCG to the secondary node. The secondary node may send the first information, the signal measurement result of the primary cell, and the signal measurement result of the secondary cell in the MCG to the primary node.

If the terminal device sends the first information to both the master node and the auxiliary node, the terminal device may send the signal measurement result of the master cell group to the master node and the signal measurement result of the auxiliary cell group to the auxiliary node. For example, as shown in fig. 4, the terminal device may transmit the first information, the signal measurement result of the primary cell, and the signal measurement result of the secondary cell in the MCG to the primary node at step S322. In step S324, the terminal device may send the first information, the signal measurement result of the primary and secondary cells, and the signal measurement result of the secondary cell in the SCG to the secondary node. Of course, the terminal device may also send the signal measurement result of the primary cell group and the signal measurement result of the secondary cell group to the primary node and the secondary node at the same time, which is not specifically limited in this embodiment of the present application.

After receiving the first information sent by the terminal device, the primary node and/or the secondary node can determine whether the terminal device performs RLM relaxation and/or BFD relaxation. For example, the primary node and/or the secondary node may determine whether the terminal device is RLM relaxed and/or BFD relaxed based on the first information. For another example, the primary node and/or the secondary node may determine whether the terminal device is RLM relaxed and/or BFD relaxed based on the first information and the signal quality of the serving cell.

As one example, the primary node and/or secondary node may determine that the terminal device is RLM relaxed and/or BFD relaxed if the terminal device meets low mobility criteria. In some embodiments, the primary node and/or the secondary node may determine that the terminal device performs RLM relaxation and/or BFD relaxation if the terminal device satisfies the low mobility criterion and the signal quality of the serving cell satisfies a preset condition. The preset condition may be that the signal quality is greater than a threshold value. The type and configuration of the threshold may be similar to the threshold in RRM measurement relaxation. For brevity, no further description is provided herein.

If the primary node and/or secondary node determines that the terminal device can perform RLM relaxation and/or BFD relaxation, the primary node and/or secondary node may send a first instruction to the terminal device. As shown in fig. 3-5, the primary node and/or the secondary node may send a first instruction to the terminal device, the first instruction being for instructing the terminal device to perform measurement relaxation in step S330. The measured relaxation may be, for example, RLM relaxation and/or BFD relaxation.

In some embodiments, the network device may further indicate to the terminal device, when sending the first instruction to the terminal device, the type of measured relaxation, such as RLM relaxation, BFD relaxation, or both RLM relaxation and BFD relaxation. Of course, the type of measurement relaxation may also be default in the protocol, or the type of measurement relaxation may be agreed between the terminal device and the network device. If the network device does not indicate to the terminal device the type of measurement relaxation, the terminal device may relax the contracted or default measurement type.

After receiving the first instruction, the terminal device may determine whether RLM relaxation and/or BFD relaxation is enabled. As an example, the terminal device may directly initiate RLM relaxation and/or BFD relaxation after receiving the first instruction. As another example, the terminal device may decide to initiate or not initiate RLM relaxation and/or BFD relaxation depending on the implementation of the terminal device itself.

If the terminal device performs RLM relaxation, the terminal device may perform RLM relaxation on cells in the primary cell group and/or the secondary cell group. For example, the terminal device may perform RLM relaxation for at least one cell (e.g., PCell and/or PSCell) in the primary cell group. If the terminal device performs BFD relaxation, the terminal device may perform BFD relaxation on cells in the primary cell group and/or the secondary cell group. For example, the terminal device may BFD relax at least one cell (e.g., at least one of PCell, PSCell, and SCell) in the primary cell group or secondary cell group.

Method embodiments of the present application are described above in detail in connection with fig. 1-5, and apparatus embodiments of the present application are described below in detail in connection with fig. 6-9. It is to be understood that the description of the method embodiments corresponds to the description of the device embodiments, and that parts not described in detail can therefore be seen in the preceding method embodiments.

Fig. 6 is a schematic structural diagram of a dual connectivity network-based communication device provided in an embodiment of the present application. The dual connectivity network includes a primary node and a secondary node. The apparatus 600 of fig. 6 may be any of the terminal devices described above. The apparatus 600 may include a receiving unit 610.

The receiving unit 610 may be configured to receive a first instruction from the primary node and/or the secondary node for instructing the terminal device to RLM relax and/or BFD relax when the terminal device meets a low mobility criterion.

Optionally, the first instruction is derived based on first information, wherein the first information is used to instruct the terminal device to meet the low mobility criterion.

Optionally, the apparatus 600 may further include a transmitting unit, where the transmitting unit may be configured to simultaneously transmit first information to the primary node and the secondary node when the terminal device satisfies the low mobility criterion before receiving the first instruction from the primary node and/or the secondary node; the sending unit may be configured to send the first information to the primary node when the terminal device satisfies the low mobility criterion before receiving a first instruction from the primary node and/or the secondary node, so that the primary node sends the first information to the secondary node; or, the sending unit may be configured to send the first information to the secondary node when the terminal device satisfies the low mobility criterion before receiving the first instruction from the primary node and/or the secondary node, so that the secondary node sends the first information to the primary node.

Optionally, the primary node and the secondary node transmit the first information through an inter-node RRC message or an XnAP message.

Optionally, the low mobility criterion parameter of the terminal device is configured by the master node; or the low mobility criterion parameter of the terminal equipment is configured by the auxiliary node; wherein the low mobility criterion parameter is used to determine whether the low mobility criterion is met.

Optionally, the low mobility criterion parameter is configured by the master node via SRB 1; alternatively, the low mobility criterion parameter is configured by the secondary node via SRB1 or SRB 3.

Optionally, the low mobility criterion parameter comprises a parameter t-SearchDeltaP and/or a parameter s-SearchDeltaP.

Optionally, whether the low mobility criterion is met is determined by signal measurements of the primary cell by the terminal device; or, whether the low mobility criterion is fulfilled is determined by signal measurements of the primary and secondary cells by the terminal device.

Optionally, the first information is included in a first message, where the first message is a measurement report message or a UE assistance message.

Optionally, the first information is included in a first message, which is carried in SRB1 or SRB 3.

Optionally, the first information is included in a first message, and the first message further includes second information, where the second information is used to indicate a serving cell signal quality of the terminal device.

Optionally, the second information includes one or more of: a signal measurement result of a primary cell of the terminal device; signal measurement results of one or more secondary cells in a primary cell group of the terminal device; the signal measurement result of the primary and secondary cells of the terminal equipment; or, signal measurement results of one or more secondary cells in the secondary cell group of the terminal device.

Optionally, the signal measurement includes one or more of: RSRP measurements, RSRQ measurements, and SINR measurements.

Fig. 7 is another communication device based on a dual connectivity network according to an embodiment of the present application. The dual connectivity network includes a primary node and a secondary node. The apparatus 700 of fig. 7 may be any of the master nodes described above. The apparatus 700 may include a transmitting unit 710.

The sending unit 710 may be configured to send a first instruction to the terminal device for instructing the terminal device to perform radio link monitoring RLM relaxation and/or beam failure detection BFD relaxation when the terminal device meets a low mobility criterion.

Optionally, the apparatus 700 further comprises a receiving unit, which may be configured to receive the first information from the terminal device before sending the first instruction to the terminal device; or, the receiving unit may be configured to receive the first information from the secondary node before sending the first instruction to the terminal device.

Optionally, the first information is sent by the secondary node to the primary node through an inter-node RRC message or an XnAP message.

Fig. 8 is another communication device based on a dual connectivity network according to an embodiment of the present application. The dual connectivity network includes a primary node and a secondary node. The apparatus 800 of fig. 8 may be any of the secondary nodes described above. The apparatus 800 may include a transmitting unit 810.

The sending unit 810 may be configured to send a first instruction to the terminal device for instructing the terminal device to perform radio link monitoring RLM relaxation and/or beam failure detection BFD relaxation when the terminal device meets a low mobility criterion.

Optionally, the apparatus 800 further comprises a receiving unit, which may be configured to receive first information from the terminal device before the secondary node sends the first instruction to the terminal device; or, the receiving unit may be configured to receive the first information from the primary node before the secondary node sends the first instruction to the terminal device.

Optionally, the first information is sent by the primary node to the secondary node through an inter-node RRC message or an XnAP message.

Fig. 9 is a schematic structural diagram of a dual connectivity network-based communication apparatus according to an embodiment of the present application. The dashed lines in fig. 9 indicate that the unit or module is optional. The apparatus 900 may be used to implement the methods described in the method embodiments above. The apparatus 900 may be a chip, a terminal, a master node, or a slave node.

The apparatus 900 may include one or more processors 910. The processor 910 may support the apparatus 900 to implement the methods described in the method embodiments above. The processor 910 may be a general purpose processor or a special purpose processor. For example, the processor may be a central processing unit (central processing unit, CPU). Alternatively, the processor may be another general purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The apparatus 900 may also include one or more memories 920. The memory 920 has stored thereon a program that can be executed by the processor 910 to cause the processor 910 to perform the method described in the method embodiments above. The memory 920 may be separate from the processor 910 or may be integrated into the processor 910.

The apparatus 900 may also include a transceiver 930. The processor 910 may communicate with other devices or chips through the transceiver 930. For example, the processor 910 may transmit and receive data to and from other devices or chips through the transceiver 930.

The embodiment of the application also provides a computer readable storage medium for storing a program. The computer-readable storage medium may be applied to a terminal or a network device provided in the embodiments of the present application, and the program causes a computer to execute the method performed by the terminal or the network device in the embodiments of the present application.

Embodiments of the present application also provide a computer program product. The computer program product includes a program. The computer program product may be applied to a terminal or a network device provided in embodiments of the present application, and the program causes a computer to perform the methods performed by the terminal or the network device in the embodiments of the present application.

The embodiment of the application also provides a computer program. The computer program may be applied to a terminal or a network device provided in embodiments of the present application, and cause a computer to perform the methods performed by the terminal or the network device in the embodiments of the present application.

It should be understood that in the embodiments of the present application, "B corresponding to a" means that B is associated with a, from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.

It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

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 foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by 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

A method of communication based on a dual connectivity network, the dual connectivity network comprising a primary node and a secondary node, the method comprising:

when the terminal device meets the low mobility criterion, the terminal device receives a first instruction from the main node and/or the auxiliary node, wherein the first instruction is used for indicating the terminal device to perform Radio Link Monitoring (RLM) relaxation and/or Beam Failure Detection (BFD) relaxation.
The method of claim 1, wherein the step of determining the position of the substrate comprises,

the first instruction is derived based on first information indicating that the terminal device satisfies the low mobility criterion.
The method according to claim 2, wherein before the terminal device receives the first instruction from the primary node and/or the secondary node, further comprising: when the terminal equipment meets the low mobility criterion, the first information is sent to the main node and the auxiliary node simultaneously;

When the terminal equipment meets the low mobility criterion, sending the first information to the main node so that the main node sends the first information to the auxiliary node; or alternatively, the first and second heat exchangers may be,

and when the terminal equipment meets the low mobility criterion, the first information is sent to the auxiliary node so that the auxiliary node can send the first information to the main node.
A method according to claim 3, wherein the primary node and the secondary node transmit the first information via an inter-node radio resource control, RRC, message or an Xn application protocol, xnAP, message.
The method according to any one of claims 1-4, wherein:

the low mobility criterion parameters of the terminal device are configured by the master node; or,

the low mobility criterion parameter of the terminal equipment is configured by the auxiliary node;

wherein the low mobility criterion parameter is used to determine whether the low mobility criterion is met.
The method according to claim 5, wherein:

the low mobility criterion parameter is configured by the master node over a signaling radio bearer SRB 1; or,

the low mobility criterion parameter is configured by the secondary node via SRB1 or SRB 3.
The method according to claim 5 or 6, wherein the low mobility criterion parameter comprises a parameter t-SearchDeltaP and/or a parameter s-SearchDeltaP.
The method according to any one of claims 1-7, wherein:

whether the low mobility criterion is met is determined by signal measurements of the primary cell by the terminal device; or,

whether the low mobility criterion is fulfilled is determined by signal measurements of the primary and secondary cells by the terminal device.
The method according to any of claims 1-8, wherein the first information is contained in a first message, the first message being a measurement report message or a user equipment, UE, assistance message.
The method according to any of claims 1-9, wherein the first information is contained in a first message, the first message being carried in SRB1 or SRB 3.
The method according to any of claims 1-10, wherein the first message further comprises second information indicating a serving cell signal quality of the terminal device.
The method of claim 11, wherein the second information comprises one or more of:

A signal measurement result of a primary cell of the terminal device;

signal measurement results of one or more secondary cells in a primary cell group of the terminal device;

the signal measurement result of the primary and secondary cells of the terminal equipment; or,

and signal measurement results of one or more secondary cells in the secondary cell group of the terminal equipment.
The method of claim 8 or 12, wherein the signal measurements comprise one or more of: a measurement of reference signal received power, RSRP, a measurement of reference signal received quality, RSRQ, and a measurement of signal to interference plus noise ratio, SINR.
A method of communication based on a dual connectivity network, the dual connectivity network comprising a primary node and a secondary node, the method comprising:

when the terminal equipment meets the low mobility criterion, the master node sends a first instruction to the terminal equipment, wherein the first instruction is used for instructing the terminal equipment to carry out Radio Link Monitoring (RLM) relaxation and/or Beam Failure Detection (BFD) relaxation.
The method of claim 14, wherein the step of providing the first information comprises,

the first instruction is derived based on first information indicating that the terminal device satisfies the low mobility criterion.
The method of claim 15, wherein before the master node sends the first instruction to the terminal device, further comprising:

the master node receives the first information from the terminal device; or alternatively, the first and second heat exchangers may be,

the primary node receives the first information from the secondary node.
The method of claim 16, wherein the first information is sent by the secondary node to the primary node via an inter-node radio resource control, RRC, message or an Xn application protocol, xnAP, message.
The method according to any one of claims 14-17, wherein:

the low mobility criterion parameters of the terminal device are configured by the master node; or,

the low mobility criterion parameter of the terminal equipment is configured by the auxiliary node;

wherein the low mobility criterion parameter is used to determine whether the low mobility criterion is met.
The method according to claim 18, wherein:

the low mobility criterion parameter is configured by the master node over a signaling radio bearer SRB 1; or,

the low mobility criterion parameter is configured by the secondary node via SRB1 or SRB 3.
The method according to claim 18 or 19, wherein the low mobility criterion parameter comprises a parameter t-SearchDeltaP and/or a parameter s-SearchDeltaP.
The method according to any one of claims 14-20, wherein:

whether the low mobility criterion is met is determined by signal measurements of the primary cell by the terminal device; or,

whether the low mobility criterion is fulfilled is determined by signal measurements of the primary and secondary cells by the terminal device.
The method according to any of claims 14-21, wherein the first information is comprised in a first message, the first message being a measurement report message or a user equipment, UE, assistance message.
The method according to any of claims 14-22, wherein the first information is contained in a first message, the first message being carried in SRB1 or SRB 3.
The method according to any of claims 14-23, characterized in that the first information is comprised in a first message, which first message further comprises second information indicating the serving cell signal quality of the terminal device.
The method of claim 24, wherein the second information comprises one or more of:

a signal measurement result of a primary cell of the terminal device;

Signal measurement results of one or more secondary cells in a primary cell group of the terminal device;

the signal measurement result of the primary and secondary cells of the terminal equipment; or,

and signal measurement results of one or more secondary cells in the secondary cell group of the terminal equipment.
The method of claim 21 or 25, wherein the signal measurements comprise one or more of: a measurement of reference signal received power, RSRP, a measurement of reference signal received quality, RSRQ, and a measurement of signal to interference plus noise ratio, SINR.
A method of communication based on a dual connectivity network, the dual connectivity network comprising a primary node and a secondary node, the method comprising:

when the terminal equipment meets the low mobility criterion, the auxiliary node sends a first instruction to the terminal equipment, wherein the first instruction is used for instructing the terminal equipment to carry out Radio Link Monitoring (RLM) relaxation and/or Beam Failure Detection (BFD) relaxation.
The method of claim 27, wherein the step of determining the position of the probe is performed,

the first instruction is derived based on first information indicating that the terminal device satisfies the low mobility criterion.
The method of claim 28, further comprising, prior to the secondary node sending the first instruction to the terminal device:

the auxiliary node receives first information from the terminal equipment; or alternatively, the first and second heat exchangers may be,

the secondary node receives the first information from the primary node;

wherein the first information is used to indicate that the terminal device meets the low mobility criterion.
The method of claim 29, wherein the first information is sent by the primary node to the secondary node via an inter-node radio resource control, RRC, message or an Xn application protocol, xnAP, message.
The method according to any one of claims 27-30, wherein:

the low mobility criterion parameters of the terminal device are configured by the master node; or,

the low mobility criterion parameter of the terminal equipment is configured by the auxiliary node;

wherein the low mobility criterion parameter is used to determine whether the low mobility criterion is met.
The method according to claim 31, wherein:

the low mobility criterion parameter is configured by the master node over a signaling radio bearer SRB 1; or,

the low mobility criterion parameter is configured by the secondary node via SRB1 or SRB 3.
The method according to claim 31 or 32, wherein the low mobility criterion parameter comprises a parameter t-SearchDeltaP and/or a parameter s-SearchDeltaP.
The method according to any one of claims 27-33, wherein:

whether the low mobility criterion is met is determined by signal measurements of the primary cell by the terminal device; or,

whether the low mobility criterion is fulfilled is determined by signal measurements of the primary and secondary cells by the terminal device.
The method according to any of claims 27-34, wherein the first information is comprised in a first message, the first message being a measurement report message or a user equipment, UE, assistance message.
The method of any of claims 27-35, wherein the first information is contained in a first message, the first message being carried in SRB1 or SRB 3.
The method according to any of claims 27-36, characterized in that the first information is comprised in a first message, which first message further comprises second information indicating the serving cell signal quality of the terminal device.
The method of claim 37, wherein the second information comprises one or more of:

a signal measurement result of a primary cell of the terminal device;

signal measurement results of one or more secondary cells in a primary cell group of the terminal device;

the signal measurement result of the primary and secondary cells of the terminal equipment; or,

and signal measurement results of one or more secondary cells in the secondary cell group of the terminal equipment.
The method of claim 34 or 38, wherein the signal measurements comprise one or more of: a measurement of reference signal received power, RSRP, a measurement of reference signal received quality, RSRQ, and a measurement of signal to interference plus noise ratio, SINR.
A dual connectivity network based communication apparatus, the dual connectivity network comprising a primary node and a secondary node, the apparatus being applied to a terminal device, the apparatus comprising:

and the receiving unit is used for receiving a first instruction from the main node and/or the auxiliary node when the terminal equipment meets the low mobility criterion, wherein the first instruction is used for indicating the terminal equipment to perform Radio Link Monitoring (RLM) relaxation and/or Beam Failure Detection (BFD) relaxation.
The apparatus of claim 40, wherein the device comprises,

the first instruction is derived based on first information indicating that the terminal device satisfies the low mobility criterion.
The apparatus of claim 41, further comprising a transmitting unit,

the sending unit is configured to send first information to the master node and the slave node simultaneously when the terminal device meets the low mobility criterion before receiving a first instruction from the master node and/or the slave node;

the sending unit is configured to send, when the terminal device meets the low mobility criterion before receiving a first instruction from the primary node and/or the secondary node, the first information to the primary node, so that the primary node sends the first information to the secondary node; or alternatively, the first and second heat exchangers may be,

the sending unit is configured to send, when the terminal device meets the low mobility criterion before receiving a first instruction from the primary node and/or the secondary node, the first information to the secondary node, so that the secondary node sends the first information to the primary node.
The apparatus of claim 42, wherein the primary node and the secondary node transmit the first information via an inter-node radio resource control, RRC, message or an Xn application protocol, xnAP, message.
The apparatus of any one of claims 40-43, wherein:

the low mobility criterion parameters of the terminal device are configured by the master node; or,

the low mobility criterion parameter of the terminal equipment is configured by the auxiliary node;

wherein the low mobility criterion parameter is used to determine whether the low mobility criterion is met.
The apparatus according to claim 44, wherein:

the low mobility criterion parameter is configured by the master node over a signaling radio bearer SRB 1; or,

the low mobility criterion parameter is configured by the secondary node via SRB1 or SRB 3.
The apparatus according to claim 44 or 45, wherein the low mobility criterion parameter comprises a parameter t-SearchDeltaP and/or a parameter s-SearchDeltaP.
The apparatus according to any one of claims 40-46, wherein:

whether the low mobility criterion is met is determined by signal measurements of the primary cell by the terminal device; or,

whether the low mobility criterion is fulfilled is determined by signal measurements of the primary and secondary cells by the terminal device.
The apparatus of any one of claims 40-47, wherein the first information is contained in a first message, the first message being a measurement report message or a user equipment, UE, assistance message.
The apparatus of any one of claims 40-48, wherein the first information is contained in a first message, the first message carried in SRB1 or SRB 3.
The apparatus of any one of claims 40-49, wherein the first information is included in a first message, the first message further comprising second information indicating a serving cell signal quality of the terminal device.
The apparatus of claim 50, wherein the second information comprises one or more of:

a signal measurement result of a primary cell of the terminal device;

signal measurement results of one or more secondary cells in a primary cell group of the terminal device;

the signal measurement result of the primary and secondary cells of the terminal equipment; or,

and signal measurement results of one or more secondary cells in the secondary cell group of the terminal equipment.
The apparatus of claim 47 or 51, wherein the signal measurements comprise one or more of: a measurement of reference signal received power, RSRP, a measurement of reference signal received quality, RSRQ, and a measurement of signal to interference plus noise ratio, SINR.
A dual connectivity network based communication apparatus, the dual connectivity network comprising a primary node and a secondary node, the apparatus being applied to the primary node, the apparatus comprising:

and the sending unit is used for sending a first instruction to the terminal equipment when the terminal equipment meets the low mobility criterion, wherein the first instruction is used for indicating the terminal equipment to carry out Radio Link Monitoring (RLM) relaxation and/or Beam Failure Detection (BFD) relaxation.
The apparatus of claim 27, wherein the device comprises a plurality of sensors,

the first instruction is derived based on first information indicating that the terminal device satisfies the low mobility criterion.
The apparatus of claim 54, further comprising a receiving unit,

the receiving unit is used for receiving first information from the terminal equipment before sending a first instruction to the terminal equipment; or alternatively, the first and second heat exchangers may be,

the receiving unit is configured to receive the first information from the secondary node before sending a first instruction to the terminal device.
The apparatus of claim 55, wherein the first information is sent by the secondary node to the primary node via an inter-node radio resource control, RRC, message or an Xn application protocol, xnAP, message.
The apparatus according to any one of claims 53-56, wherein:

the low mobility criterion parameters of the terminal device are configured by the master node; or,

the low mobility criterion parameter of the terminal equipment is configured by the auxiliary node;

wherein the low mobility criterion parameter is used to determine whether the low mobility criterion is met.
The apparatus according to claim 57, wherein:

the low mobility criterion parameter is configured by the master node over a signaling radio bearer SRB 1; or,

the low mobility criterion parameter is configured by the secondary node via SRB1 or SRB 3.
The apparatus of claim 57 or 58, wherein the low mobility criterion parameter comprises a parameter t-SearchDeltaP and/or a parameter s-SearchDeltaP.
The apparatus according to any one of claims 53-59, wherein:

whether the low mobility criterion is met is determined by signal measurements of the primary cell by the terminal device; or,

whether the low mobility criterion is fulfilled is determined by signal measurements of the primary and secondary cells by the terminal device.
The apparatus according to any of claims 53-60, wherein the first information is contained in a first message, the first message being a measurement report message or a user equipment, UE, assistance message.
The apparatus of any one of claims 53-61, wherein the first information is contained in a first message, the first message carried in SRB1 or SRB 3.
The apparatus according to any of claims 53-62, wherein the first information is contained in a first message, the first message further comprising second information indicating a serving cell signal quality of the terminal device.
The apparatus of claim 63, wherein the second information comprises one or more of:

a signal measurement result of a primary cell of the terminal device;

signal measurement results of one or more secondary cells in a primary cell group of the terminal device;

the signal measurement result of the primary and secondary cells of the terminal equipment; or,

and signal measurement results of one or more secondary cells in the secondary cell group of the terminal equipment.
The apparatus of claim 60 or 64, wherein the signal measurements comprise one or more of: a measurement of reference signal received power, RSRP, a measurement of reference signal received quality, RSRQ, and a measurement of signal to interference plus noise ratio, SINR.
A dual connectivity network based communication apparatus, the dual connectivity network comprising a primary node and a secondary node, the apparatus being applied to the secondary node, the apparatus comprising:

and the sending unit is used for sending a first instruction to the terminal equipment when the terminal equipment meets the low mobility criterion, wherein the first instruction is used for indicating the terminal equipment to carry out Radio Link Monitoring (RLM) relaxation and/or Beam Failure Detection (BFD) relaxation.
The apparatus of claim 66, wherein the device comprises,

the first instruction is derived based on first information indicating that the terminal device satisfies the low mobility criterion.
The apparatus of claim 67, further comprising a receiving unit,

the receiving unit is used for receiving first information from the terminal equipment before the auxiliary node sends a first instruction to the terminal equipment; or alternatively, the first and second heat exchangers may be,

the receiving unit is configured to receive the first information from the primary node before the secondary node sends a first instruction to the terminal device.
The apparatus of claim 68, wherein the first information is sent by the primary node to the secondary node via an inter-node radio resource control, RRC, message or an Xn application protocol, xnAP, message.
The apparatus of any one of claims 66-69, wherein:

the low mobility criterion parameters of the terminal device are configured by the master node; or,

the low mobility criterion parameter of the terminal equipment is configured by the auxiliary node;

wherein the low mobility criterion parameter is used to determine whether the low mobility criterion is met.
The apparatus according to claim 70, wherein:

the low mobility criterion parameter is configured by the master node over a signaling radio bearer SRB 1; or,

the low mobility criterion parameter is configured by the secondary node via SRB1 or SRB 3.
The apparatus of claim 70 or 71, wherein the low mobility criterion parameter comprises a parameter t-SearchDeltaP and/or a parameter s-SearchDeltaP.
The apparatus according to any one of claims 66-72, wherein:

whether the low mobility criterion is met is determined by signal measurements of the primary cell by the terminal device; or,

whether the low mobility criterion is fulfilled is determined by signal measurements of the primary and secondary cells by the terminal device.
The apparatus of any one of claims 66-73, wherein the first information is contained in a first message, the first message being a measurement report message or a user equipment, UE, assistance message.
The apparatus of any one of claims 66-74, wherein the first information is contained in a first message, the first message carried in SRB1 or SRB 3.
The apparatus of any one of claims 66-75, wherein the first information is included in a first message, the first message further comprising second information indicating a serving cell signal quality of the terminal device.
The apparatus of claim 76, wherein the second information comprises one or more of:

a signal measurement result of a primary cell of the terminal device;

signal measurement results of one or more secondary cells in a primary cell group of the terminal device;

the signal measurement result of the primary and secondary cells of the terminal equipment; or,

and signal measurement results of one or more secondary cells in the secondary cell group of the terminal equipment.
The apparatus of claim 73 or 77, wherein the signal measurements comprise one or more of: a measurement of reference signal received power, RSRP, a measurement of reference signal received quality, RSRQ, and a measurement of signal to interference plus noise ratio, SINR.
A dual connectivity network based communication apparatus, wherein the apparatus is applied to a terminal device, the apparatus comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method according to any of claims 1-13.
A dual connectivity network based communication apparatus, wherein the apparatus is applied to a master node, the apparatus comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method according to any of claims 14-26.
A dual connectivity network based communication device, wherein the device is applied to a secondary node, the device comprising a memory for storing a program and a processor for invoking the program in the memory to perform the method according to any of claims 27-39.
An apparatus comprising a processor configured to invoke a program from memory to perform the method of any of claims 1-13.
An apparatus comprising a processor configured to invoke a program from memory to perform the method of any of claims 14-26.
An apparatus comprising a processor configured to invoke a program from memory to perform the method of any of claims 27-39.
A chip comprising a processor for calling a program from a memory, causing a device on which the chip is mounted to perform the method of any one of claims 1-13.
A chip comprising a processor for calling a program from a memory, causing a device on which the chip is mounted to perform the method of any of claims 14-26.
A chip comprising a processor for calling a program from a memory, causing a device on which the chip is mounted to perform the method of any of claims 27-39.
A computer-readable storage medium, characterized in that a program is stored thereon, which program causes a computer to perform the method according to any of claims 1-13.
A computer-readable storage medium, having stored thereon a program that causes a computer to perform the method of any of claims 14-26.
A computer-readable storage medium, having stored thereon a program that causes a computer to perform the method of any of claims 27-39.
A computer program product comprising a program for causing a computer to perform the method of any one of claims 1-13.
A computer program product comprising a program for causing a computer to perform the method of any one of claims 14-26.
A computer program product comprising a program for causing a computer to perform the method of any one of claims 27-39.
A computer program, characterized in that the computer program causes a computer to perform the method according to any one of claims 1-13.
A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 14-26.
A computer program, characterized in that the computer program causes a computer to perform the method according to any of claims 27-39.