CN116782313A

CN116782313A - Communication method and communication device

Info

Publication number: CN116782313A
Application number: CN202210239529.3A
Authority: CN
Inventors: 朱世超; 孙飞; 曾清海
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2023-09-19
Also published as: WO2023169347A1

Abstract

The application provides a communication method and a communication device, which provide a first event for triggering neighbor cell measurement, and a vehicle-mounted mobile IAB node deployed in a vehicle can realize that a terminal in the vehicle stops a group switching mode and starts neighbor cell measurement when the vehicle stops by detecting the first event and reporting a host node, so as to provide for cell switching of a terminal in the vehicle. And a second event triggering the terminal to execute measurement reporting of the neighbor cell measurement is provided, so that the terminal can trigger measurement reporting of the neighbor cell measurement when sensing that the terminal gets on or gets off the vehicle, thereby realizing advanced switching of service cells of the on-vehicle terminal or the off-vehicle terminal, avoiding disconnection of RRC connection between the terminal and a source base station due to the on-vehicle or the off-vehicle, and reducing influence on service continuity. And providing a third event for triggering and stopping neighbor cell measurement, and enabling the in-vehicle terminal to enter a group switching mode after the vehicle is restarted by the vehicle-mounted mobile IAB node through detecting the third event so as to save the power consumption of the in-vehicle terminal.

Description

Communication method and communication device

Technical Field

The embodiment of the application relates to the technical field of wireless communication, in particular to a communication method and a communication device.

Background

As communication technologies continue to evolve, access and backhaul integrated (integratedaccess and backhaul, IAB) technologies further enhance. In the evolution direction to be standardized, the IAB technology will be mobility enhanced. In an IAB scenario based on vehicular mobile relay (vehicle mobile relay, VMR) based on buses, subways, high-speed rails, or the like, new problems are brought to cell handover of User Equipment (UE) due to mobility of an IAB node.

For example, when the vehicle is running between stations, the UE in the vehicle is almost stationary with the vehicle, and the cell handover of the UE is adapted to take a group handover mode, i.e. the UE initially accesses the IAB node, and is handed over with the IAB node when needed. However, in the normal cell handover procedure, each UE needs to perform neighbor cell measurement, measurement reporting and handover independently, which causes a lot of signaling overhead and high power consumption of the UE. In addition, the conventional cell switching process is not suitable enough for the dynamic property of the vehicle, when the vehicle stops, the on-board or off-board of the UE occurs, and when the vehicle is started again, the on-board UE and the off-board UE and the source base station perform rapid relative movement, and after the occurrence of the A2 event, the UE may not complete the neighbor cell measurement, reporting and switching execution, and the UE has disconnected the radio resource control (radio resource control, RRC) from the source base station, so that the service is interrupted. In addition, in the group switching mode, before the user equipment gets off, the UE is in the group switching mode, and the functions of neighbor cell measurement and measurement reporting are not started. Because the new on-board UE starts too rapidly, the new on-board UE breaks the RRC connection with the source base station before receiving the handover command of the source base station, which may cause service interruption.

It can be seen that the existing common cell handover procedure and group handover procedure are not suitable for the mobility of the IAB node.

Disclosure of Invention

The application provides a communication method and a communication device, which can cope with the mobility of an IAB node and can reduce adverse effects caused by the mobility of the IAB node in the cell switching process.

In a first aspect, a communication method is provided, the method comprising:

the terminal equipment judges that a second event is generated, wherein the second event is that the terminal equipment and the vehicle-mounted access node relatively move;

the terminal device sends a measurement report of neighbor cell measurement and first information to the vehicle-mounted access node, wherein the first information indicates that the measurement report is sent based on a second event.

In the technical scheme provided by the application, a second event triggering the terminal to execute measurement reporting of neighbor cell measurement is provided, and under the condition that the terminal equipment in the vehicle where the vehicle-mounted mobile IAB node is located determines that the second event is generated, a measurement report of neighbor cell measurement and first information are sent to the vehicle-mounted mobile IAB node so as to indicate that the measurement reporting is triggered by the second event. After receiving the measurement report and the first information, the source node initiates a handover procedure from the source cell to the target cell. The terminal equipment detects a second event, namely the terminal equipment senses that the vehicle gets off and the vehicle starts to leave, and the source node can timely switch the terminal equipment of the vehicle to ground access equipment outside the vehicle-mounted mobile IAB node by reporting a measurement report to the source node and indicating that the second event is generated, so that timely switching is realized, and the mobility of the vehicle-mounted mobile IAB node can be dealt with.

The scheme can cope with the mobility of the vehicle-mounted mobile IAB node, so that adverse influence of service interruption caused by the disconnection of the RRC connection of the terminal equipment with the source node after the terminal equipment gets off the vehicle can be reduced, and the success rate of switching is improved.

With reference to the first aspect, in certain implementation manners of the first aspect, the determining by the terminal device to generate the second event includes:

the terminal device determines to generate the second event in the following case:

when terminal equipment communicates with access equipment of a service cell, the variation or the discrete degree of Reference Signal Receiving Power (RSRP) of the service cell in a period of time is larger than or equal to a first threshold; and/or the number of the groups of groups,

when the terminal equipment communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is larger than or equal to a second threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the timing advance TA indicated by the access device of the serving cell of the terminal device in a period of time is greater than or equal to the third threshold.

It should be understood that the numbers of the thresholds in some embodiments of the present application, such as "first threshold", "second threshold", etc., are merely for distinguishing between the setting of thresholds in different situations, and the setting of the values of these thresholds depends on the implementation, and it should not be considered that different numbers of the thresholds represent different values of the thresholds, and the description is applicable throughout. For example, the first threshold and the second threshold may be the same or different, and are not limited.

In the technical scheme, by providing a plurality of methods for judging the generation of the second event, the exception that a single method possibly generates some misjudgment to generate the second event is avoided, the combination of the methods reduces the possibility of misjudgment, improves the accuracy of judging the second event, reduces the possibility of misswitching, and integrally ensures the switching success rate in the vehicle-mounted mobile IAB scene.

With reference to the first aspect, in certain implementation manners of the first aspect, after the terminal device sends the measurement report of the neighbor cell measurement and the first information to the vehicle-mounted access node, the method further includes:

the terminal equipment receives a first message from the vehicle-mounted access node, the first message indicates the terminal equipment to execute cell switching, the first message comprises information of a target cell, and the target cell is managed by access equipment outside a vehicle where the vehicle-mounted access node is located.

In the technical scheme, after a terminal device sends a measurement report and first information to a source node, a first message sent by the source node through a vehicle-mounted mobile IAB node is received, wherein the first message contains information of a target cell. The terminal equipment performs cell switching according to the first message, can switch to the ground access equipment outside the vehicle-mounted mobile IAB node in time, and can reduce the occurrence of service interruption caused by vehicle driving away after the terminal equipment gets off.

With reference to the first aspect, in some implementations of the first aspect, before the terminal device determines that the second event occurs, the terminal device is located in a vehicle where the vehicle-mounted access node is located, and a mode in which the terminal device performs cell switching is a group switching mode, where the group switching mode is that the terminal device and other terminal devices accessing the vehicle-mounted access node and the vehicle-mounted access node perform cell switching as a group, and neighbor cell measurement and measurement reporting of the cell switching in the group switching mode are performed by the vehicle-mounted access node.

With reference to the first aspect, in certain implementation manners of the first aspect, before the terminal device determines to generate the second event, the method further includes:

the terminal equipment receives a second message from the vehicle-mounted access node, the second message indicates the terminal equipment to execute the neighbor cell measurement, the second message is sent by the source node under the condition of receiving a third message from the vehicle-mounted access node, the third message indicates to generate a first event, and the first event is that the vehicle where the vehicle-mounted access node is located is changed from running to parking.

In the technical scheme, the terminal equipment judges that a second event is generated through neighbor cell measurement, and then performs measurement reporting to the source node. However, the terminal device is in a group switch mode due to initial access to the mobile IAB node onboard the vehicle. Therefore, the terminal device starts neighbor cell measurement and is indicated by the network side, specifically, in the case that the vehicle-mounted mobile IAB node detects the first event, the host node is notified through the third message. The host node sends a second message to terminal equipment in the vehicle through the vehicle-mounted mobile IAB node based on the third message to instruct each terminal equipment in the vehicle to stop the group switching mode, and starts neighbor cell measurement, so as to prepare for the terminal equipment in the vehicle to get off in advance, so that after the terminal equipment gets off, the terminal equipment is switched to ground access equipment outside the vehicle-mounted mobile IAB node in time, the switching success rate is improved, and the adverse effect of service interruption caused by the disconnection of RRC connection with the source node after the terminal equipment gets off is reduced.

In a second aspect, a communication method is provided, the method comprising:

the terminal device sends a measurement report of neighbor cell measurement and first information to the on-board access node under the following conditions:

the variation or the discrete degree of the timing advance TA indicated by the access equipment of the serving cell of the terminal equipment in a period of time is larger than or equal to a third threshold;

the first information indicates that the terminal equipment and the vehicle-mounted access node relatively move.

Alternatively, as an alternative to the method of the second aspect, the method may be expressed as:

the terminal equipment sends a measurement report of neighbor cell measurement and first information to the vehicle-mounted access node, wherein the first information indicates generation of a second event, and the second event can be:

The variation or the discrete degree of the RSRP of the serving cell of the terminal equipment in a period of time is larger than or equal to a first threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the wave beam corresponding to the maximum value of the RSRP of the serving cell of the terminal equipment in a period of time is larger than or equal to a second threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the timing advance TA indicated by the access equipment of the serving cell of the terminal equipment in a period of time is greater than or equal to a third threshold.

Alternatively, as another alternative to the method of the second aspect, the method may be expressed as:

the method comprises the steps that terminal equipment sends a measurement report of neighbor cell measurement and first information to a vehicle-mounted access node, wherein the first information indicates:

the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell of the terminal equipment in a period of time is larger than or equal to a second threshold; and/or the number of the groups of groups,

In the technical scheme provided by the application, the terminal equipment sends the measurement report and the first information of the neighbor cell measurement to the source node under one or more conditions. After receiving the measurement report and the first information, the source node initiates a handover procedure from the source cell to the target cell, and can cope with the mobility of the vehicle-mounted mobile IAB node.

It should be understood that in one or more cases, the terminal device may determine that the vehicle gets off and the vehicle starts to leave, by reporting the measurement report and the first information to the source node, the source node may timely switch the terminal device of the vehicle getting off to a ground access device other than the vehicle-mounted mobile IAB node, so as to implement timely switching, thereby being capable of coping with mobility of the vehicle-mounted mobile IAB node.

In a third aspect, a communication method is provided, the method comprising:

the terminal equipment judges that a second event is generated, wherein the second event is that the terminal equipment and the source node relatively move;

the terminal device sends a measurement report of neighbor cell measurements and first information to the source node, the first information indicating that the measurement report is sent based on the second event.

In the technical scheme provided by the application, a second event triggering the terminal to execute measurement reporting of neighbor cell measurement is provided, and under the condition that the terminal equipment in the vehicle where the vehicle-mounted mobile IAB node is located determines that the second event is generated, a measurement report of neighbor cell measurement and first information are sent to the vehicle-mounted mobile IAB node so as to indicate that the measurement reporting is triggered by the second event. After receiving the measurement report and the first information, the source node initiates a handover procedure from the source cell to the target cell. The terminal equipment detects a second event, namely the terminal equipment senses that the terminal equipment gets on the vehicle and moves relatively to the source node (or moves away from the source node), and the source node can timely switch the terminal equipment getting on the vehicle to the vehicle-mounted mobile IAB node by reporting a measurement report to the source node and indicating to generate the second event, so that timely switching is realized, and the mobility of the vehicle-mounted mobile IAB node can be dealt with.

With reference to the third aspect, in certain implementations of the third aspect, the terminal device determines to generate the second event, including:

With reference to the third aspect, in some implementations of the third aspect, after the terminal device sends the measurement report of the neighbor cell measurement and the first information to the source node, the method further includes:

the terminal equipment receives a first message from the source node, the first message indicates the terminal equipment to execute cell switching, the first message comprises information of a target cell, the target cell is managed by a vehicle-mounted access node, and the source node is an access node except a vehicle where the vehicle-mounted access node is located.

In the technical scheme, after a terminal device sends a measurement report and first information to a source node, the terminal device receives a first message sent by the source node, wherein the first message contains information of a target cell, and the target cell is managed by a vehicle-mounted mobile IAB node. The terminal equipment performs cell switching according to the first message, can access the vehicle-mounted mobile IAB node in time, and reduces the adverse effect of service interruption caused by the disconnection of the RRC connection between the terminal equipment and the source node due to the vehicle driving away after the terminal equipment gets on the vehicle.

With reference to the third aspect, in certain implementations of the third aspect, the method further includes:

the terminal equipment is switched to a target cell based on the first message;

the terminal device receives a fourth message from the vehicle-mounted access node, the fourth message instructs the terminal device to stop the neighbor cell measurement and to change the cell switching mode into a group switching mode,

the fourth message is sent by the host node of the vehicle-mounted access node under the condition that the host node receives a fifth message from the vehicle-mounted access node, the fifth message indicates to generate a third event, and the third event is that the vehicle where the vehicle-mounted access node is located is changed from parking to running;

and the group switching mode is that the terminal equipment and other terminal equipment accessed to the vehicle-mounted access node and the vehicle-mounted access node are used as a group to execute cell switching, and neighbor cell measurement and measurement reporting of the cell switching of the group switching mode are executed by the vehicle-mounted access node.

In the technical scheme, after the terminal equipment gets on the vehicle, if the vehicle-mounted mobile IAB node detects that the vehicle is started again, the vehicle-mounted mobile IAB node informs the host node through a fifth message. The host node sends a fourth message to the terminal equipment in the vehicle through the vehicle-mounted mobile IAB node based on the fifth message to instruct the terminal equipment to stop neighbor cell measurement, and enters a group switching mode from a common switching mode so as to save the power consumption of the terminal equipment in the vehicle.

In a fourth aspect, a communication method is provided, the method comprising:

the terminal device sends a measurement report of neighbor cell measurement and first information to the source node in the following case:

The first information indicates that the terminal equipment and the source node relatively move.

Alternatively, as an alternative to the method of the fourth aspect, the method may be expressed as:

the terminal equipment sends a measurement report of neighbor cell measurement and first information to the source node, wherein the first information indicates generation of a second event, and the second event can be:

Alternatively, as another alternative to the method of the fourth aspect, the method may be expressed as:

the method comprises the steps that terminal equipment sends a measurement report of neighbor cell measurement and first information to a source node, wherein the first information indicates:

In the technical scheme provided by the application, the terminal equipment sends the measurement report and the first information of the neighbor cell measurement to the source node under one or more conditions. After receiving the measurement report and the first information, the source node initiates a handover procedure from the source cell to the target cell. The mobility of the mobile IAB node in the vehicle can be dealt with.

In a fifth aspect, a communication method is provided, the method comprising:

the source node receives a measurement report from neighbor cell measurement of the terminal equipment;

the source node executes the switching judgment of the cell switching of the terminal equipment according to the triggering event of the target cell and the measurement report, wherein the target cell is determined by the source node according to the measurement report, the triggering event of the measurement report comprises a second event, and the second event is that the terminal equipment and the source node relatively move.

In the technical scheme, the source node receives a measurement report from neighbor cell measurement of the terminal equipment, can select a target cell according to the measurement report, and further determines whether to execute cell switching on the terminal equipment according to the trigger event of the target cell and the measurement report. For terminal equipment which hopes to be accessed to or separated from the vehicle-mounted mobile IAB node, the source node only receives cell switching triggered by a second event, so that timely switching of the on-vehicle terminal equipment or the off-vehicle terminal equipment can be realized, and in addition, the terminal which is not on the vehicle can be prevented from being accessed to the vehicle-mounted mobile IAB node by mistake, or the terminal equipment which is not off the vehicle can be prevented from being separated from the vehicle-mounted mobile IAB node by mistake, and the switching accuracy is improved.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the source node is a home node of the vehicle-mounted access node;

the source node executes the switching judgment of the cell switching of the terminal equipment according to the triggering event of the target cell and the measurement report, and the method comprises the following steps:

and under the condition that the target cell is not managed by the vehicle-mounted access node and the triggering event of the measurement report is a second event, the source node determines to execute cell switching of the terminal equipment.

With reference to the fifth aspect, in some implementations of the fifth aspect, the source node is a node other than a home node of the in-vehicle access node;

under the condition that a target cell is managed by a vehicle-mounted access node, a triggering event of a measurement report is an A3 event or an A5 event, and a source node receives second information from terminal equipment, the source node determines to execute cell switching of the terminal equipment, wherein the second information is sent by the terminal equipment when a first timer is overtime, and the first timer is used for assisting in switching judgment; or,

in the case that the target cell is managed by the vehicle-mounted access node, and the trigger event of the measurement report is an A3 event or an A5 event, and the RSRP of the serving cell of the terminal device is lower than a set threshold, the source node determines to perform cell handover of the terminal device.

In the above scheme, for the terminal equipment desiring to access or leave the vehicle-mounted mobile IAB node, the source node only accepts the cell handover triggered by the second event. In this solution, however, two exceptional cases are considered, namely, in case of traffic congestion and too bad a source cell signal (determined by the source node), the source node allows to switch the terminal device, so that the terminal device still has an opportunity to achieve a reasonable switch in these exceptional cases.

under the condition that the target cell is managed by the vehicle-mounted access node and the triggering event of the measurement report is a second event, the source node determines to execute cell switching of the terminal equipment; or,

when the target cell is managed by the vehicle-mounted access node, the trigger event of the measurement report is an A3 event or an A5 event, and the RSRP of the serving cell of the terminal equipment is lower than a set threshold value, the source node determines to execute cell switching of the terminal equipment;

or,

and under the condition that the target cell is managed by the vehicle-mounted access node and the triggering event of the measurement report is an A3 event or an A5 event, the source node determines to execute cell switching of the terminal equipment when a second timer is overtime, wherein the second timer is used for assisting the switching judgment.

In the above scheme, for the terminal equipment desiring to access or leave the vehicle-mounted mobile IAB node, the source node only accepts the cell handover triggered by the second event. In this solution, however, two exceptional cases are considered, namely, in case of traffic congestion and too bad a source cell signal (determined by the terminal device), the terminal device may trigger measurement reporting based on the A3 event or the A5 event, and the source node also allows to perform handover in this case, so that the terminal device still has an opportunity to achieve a reasonable handover in these exceptional cases.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the method further includes:

the source node receives a fifth message from the vehicle-mounted access node, the fifth message indicates to generate a third event, and the third event is that the vehicle where the vehicle-mounted access node is located is changed from stopping to running;

the source node sends a fourth message to the terminal equipment in the vehicle where the vehicle-mounted access node is located based on the fifth message, the fourth message instructs the terminal equipment to stop the measurement of the neighbor cell and change the cell switching mode into a group switching mode,

the group switching mode is that terminal equipment, other terminal equipment accessed to the vehicle-mounted access node and the vehicle-mounted access node are used as a group to execute cell switching, and neighbor cell measurement and measurement reporting of the cell switching of the group switching mode are executed by the vehicle-mounted access node.

In this technical solution, if the vehicle-mounted mobile IAB node detects that the vehicle is restarted, the vehicle-mounted mobile IAB node notifies the home node (at this time, the source node is the home node) through a fifth message. The host node sends a fourth message to the terminal equipment in the vehicle through the vehicle-mounted mobile IAB node based on the fifth message to instruct the terminal equipment to stop neighbor cell measurement, and enters a group switching mode from a common switching mode so as to save the power consumption of the terminal equipment in the vehicle.

With reference to the fifth aspect, in certain implementations of the fifth aspect, before the source node receives the measurement report from the terminal device, the method further includes:

the source node receives a third message from the vehicle-mounted access node, wherein the third message is sent by the vehicle-mounted access node under the condition that the vehicle-mounted access node determines to generate a first event, and the first event is that the vehicle where the vehicle-mounted access node is located is changed from running to parking;

and the source node sends a second message to the terminal equipment in the vehicle where the vehicle-mounted access node is located based on the third message, and the second message indicates the terminal equipment in the vehicle where the vehicle-mounted access node is located to execute the neighbor cell measurement.

Alternatively, the first event may be:

the variation or the discrete degree of the RSRP of the serving cell of the MT of the vehicle-mounted access node in a period of time is smaller than or equal to a set threshold; and/or the number of the groups of groups,

the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell of the MT of the vehicle-mounted access node in a period of time is smaller than or equal to a set threshold; and/or the number of the groups of groups,

the variation or the discrete degree of the timing advance TA indicated by the access equipment of the service cell of the vehicle-mounted access node in a period of time is larger than or equal to a set threshold.

In this technical solution, when the vehicle-mounted mobile IAB node detects the first event, the host node is notified by the third message (at this time, the source node is the host node). The host node sends a second message to the terminal equipment in the vehicle through the vehicle-mounted mobile IAB node based on the third message so as to instruct each terminal equipment in the vehicle to stop the group switching mode, and start neighbor cell measurement, so that preparation is made for the terminal equipment in the vehicle to get off in advance, the terminal equipment is switched to the ground access equipment outside the vehicle-mounted mobile IAB node in time after the terminal equipment gets off, the switching success rate is improved, and the adverse effect caused by service interruption due to the RRC connection disconnection with the source node after the terminal equipment gets off is reduced.

In a sixth aspect, a communication method is provided, the method comprising:

the vehicle-mounted access node judges that a first event is generated, wherein the first event is that the vehicle where the vehicle-mounted access node is located is changed from running to parking;

the vehicle-mounted access node sends a third message to the host node, wherein the third message indicates the generation of the first event;

the vehicle-mounted access node receives a second message from the host node, and the second message indicates terminal equipment in a vehicle where the vehicle-mounted access node is positioned to execute neighbor cell measurement;

And the vehicle-mounted access node sends a second message to the terminal equipment in the vehicle.

Alternatively, as an alternative to the method of the sixth aspect, the method may be expressed as:

the vehicle-mounted access node determines to generate a first event, wherein the first event comprises:

the variation or the discrete degree of the timing advance TA indicated by the access equipment of the service cell of the vehicle-mounted access node in a period of time is larger than or equal to a set threshold;

the vehicle-mounted access node sends a third message to the host node, wherein the third message indicates that the first event is generated;

and the vehicle-mounted access node sends a second message to terminal equipment in the vehicle.

Alternatively, as another alternative to the method of the sixth aspect, the method may be expressed as:

the vehicle-mounted access node sends a third message to the host node, wherein the third message indicates:

With reference to the sixth aspect, in certain implementations of the sixth aspect, the determining, by the in-vehicle access node, to generate the first event includes:

the in-vehicle access node determines that a first event is generated, in the following case:

When the vehicle-mounted access node communicates with access equipment of a service cell, the variation or the discrete degree of the RSRP of the service cell in a period of time is smaller than or equal to a fourth threshold; and/or the number of the groups of groups,

when the vehicle-mounted access node communicates with access equipment of a service cell, the variation or the discrete degree of a wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is smaller than or equal to a fifth threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the timing advance TA indicated by the access equipment of the serving cell of the vehicle-mounted access node in a period of time is greater than or equal to a sixth threshold.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the method further includes:

the vehicle-mounted access node judges that a third event is generated, wherein the third event is that the vehicle where the vehicle-mounted access node is located is changed from parking to running;

the vehicle-mounted access node sends a fifth message to the host node, wherein the fifth message indicates the generation of a third event;

the vehicle-mounted access node receives a fourth message from the host node, the fourth message indicates the terminal equipment in the vehicle where the vehicle-mounted access node is positioned to stop the measurement of the neighbor cell and change the cell switching mode into a group switching mode,

Alternatively, as another alternative to the above implementation, the third event may be:

when MT of the vehicle-mounted access node communicates with access equipment of a service cell, the variation or the discrete degree of RSRP of the service cell in a period of time is larger than or equal to a set threshold; and/or the number of the groups of groups,

when MT of the vehicle-mounted access node communicates with access equipment of a service cell, the variation or the discrete degree of a wave beam corresponding to the maximum value of RSRP of the service cell in a period of time is larger than or equal to a set threshold; and/or the number of the groups of groups,

the variation or the discrete degree of the timing advance TA indicated by the access equipment of the service cell of the vehicle-mounted access node in a period of time is larger than or larger than a set threshold.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the determining, by the in-vehicle access node, to generate the third event includes:

the in-vehicle access node determines that a third event is generated, as follows:

When the vehicle-mounted access node communicates with access equipment of a service cell, the variation or the discrete degree of the RSRP of the service cell in a period of time is larger than or equal to a seventh threshold; and/or the number of the groups of groups,

when the vehicle-mounted access node communicates with access equipment of a service cell, the variation or the discrete degree of a wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is larger than or equal to an eighth threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the timing advance TA indicated by the access equipment of the serving cell of the vehicle-mounted access node in a period of time is greater than or equal to a ninth threshold.

the vehicle-mounted access node receives a measurement report of the neighbor cell measurement from a first terminal device, wherein the measurement report comprises first information, the first information indicates that the measurement report is sent based on a second event, and the second event is that the first terminal device and a source node relatively move;

and the vehicle-mounted access node sends a measurement report to the host node.

the vehicle-mounted access node receives a measurement report and first information from the neighbor cell measurement of a first terminal device, wherein the first information indicates that the measurement report is sent based on a second event, and the second event is that the first terminal device and a source node relatively move;

And the vehicle-mounted access node sends a measurement report and first information to the host node.

The method of the sixth aspect or any implementation manner of the sixth aspect may refer to corresponding aspects of the other aspects, which are not described herein in detail.

A seventh aspect provides a communications apparatus having functionality to implement any one of the first to fourth aspects, or a method in any one of the possible implementations of these aspects. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

An eighth aspect provides a communication device having functionality to implement the method of the fifth aspect or any possible implementation of the fifth aspect. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

A ninth aspect provides a communications device having functionality to implement the method of the sixth aspect or any of the possible implementations of the sixth aspect. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a tenth aspect, a communications apparatus is provided that includes a processor and a memory. Optionally, a transceiver may also be included. Wherein the memory is for storing a computer program, and the processor is for calling and running the computer program stored in the memory and controlling the transceiver to transceive signals to cause the communication device to perform the method as in any one of the first to fourth aspects, or any one of the possible implementations of these aspects.

In an eleventh aspect, a communication device is provided that includes a processor and a memory. Optionally, a transceiver may also be included. Wherein the memory is for storing a computer program, and the processor is for invoking and running the computer program stored in the memory and controlling the transceiver to transceive signals to cause the communication device to perform the method as in the fifth aspect or any one of the possible implementations of the fifth aspect.

In a twelfth aspect, a communications device is provided that includes a processor and a memory. Optionally, a transceiver may also be included. Wherein the memory is for storing a computer program, and the processor is for calling and running the computer program stored in the memory and controlling the transceiver to transceive signals to cause the communication device to perform the method as in the sixth aspect or any one of the possible implementations of the sixth aspect.

In a thirteenth aspect, there is provided a communication device comprising a processor and a communication interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further being for outputting the data and/or information after processing by the processor, such that the method as in any one of the first to fourth aspects, or any one of the possible implementations of these aspects, is performed.

In a fourteenth aspect, there is provided a communication device comprising a processor and a communication interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further being for outputting the data and/or information after processing by the processor, such that the method as in the fifth aspect, or any possible implementation of the fifth aspect, is performed.

In a fifteenth aspect, there is provided a communications device comprising a processor and a communications interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communications interface further being for outputting the data and/or information after processing by the processor, such that the method as in the sixth aspect, or any one of the possible implementations of the sixth aspect, is performed.

In a sixteenth aspect, there is provided a computer readable storage medium having stored therein computer instructions which, when run on a computer, cause the method as in any one of the first to sixth aspects, or any one of the possible implementations of these aspects, to be performed.

A seventeenth aspect provides a computer program product comprising computer program code which, when run on a computer, causes the method as in any one of the first to sixth aspects, or any one of the possible implementations of these aspects, to be performed.

An eighteenth aspect provides a wireless communication system comprising one or more of the communication device of the seventh aspect, the communication device of the eighth aspect, and the communication device of the ninth aspect.

Drawings

Fig. 1 is a schematic diagram of an IAB radio access network side networking.

Fig. 2 is a schematic diagram of a system architecture suitable for use in embodiments of the present application.

Fig. 3 is a schematic diagram of an IAB network architecture.

Fig. 4 is a schematic flow chart of a communication method provided by the present application.

Fig. 5 is another schematic flow chart of a communication method provided by the present application.

Fig. 6 is another exemplary flow chart of a communication method provided by the present application.

Fig. 7 is an example of cell handover performed by a UE according to the present application.

Fig. 8 is another example of cell handover performed by a UE according to the present application.

Fig. 9 is another example of cell handover performed by a UE according to the present application.

Fig. 10 is another example of cell handover performed by a UE according to the present application.

Fig. 11 is a schematic block diagram of a communication device provided by the present application.

Fig. 12 is a schematic structural diagram of a communication device provided by the present application.

Detailed Description

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

Referring to fig. 1, fig. 1 is a schematic diagram of an IAB radio access network side networking. In an IAB network, a Relay Node (RN), also called an IAB-node (IAB-node), may provide a radio access service for a User Equipment (UE). The UE is connected to the IAB-node through a wireless access link, and the service data of the UE is connected to an IAB host (IAB-node) through a wireless backhaul link by the IAB-node and is accessed to the core network through the IAB-node. The IAB-node is composed of a mobile terminal (mobile termination, MT) part and a Distributed Unit (DU) part, wherein the IAB-node can be used as a terminal device, i.e. the role of MT, when facing its parent node; an IAB-node is considered a network device when it is towards its child node (which may be another IAB-node, or a generic UE), i.e. takes on the role of a DU. The Centralized Unit (CU) section of the IAB network is located in the IAB-donor. The home base station is also referred to herein as a home node, i.e., IAB-donor node.

It should be understood that in fig. 1, an access link refers to a link between a UE and an IAB-node or an IAB-donor. Alternatively, the access link includes a radio link used when a node communicates with its lower nodes. The backhaul link refers to a link between an IAB-node and an IAB child node (i.e., IAB child node) or an IAB parent node (IAB parent node).

Referring to fig. 2, fig. 2 is a schematic diagram of a system architecture suitable for use in an embodiment of the present application. In the present application, as shown in fig. 2, it is considered to deploy an IAB-node on a public transportation means such as a subway, a bus, etc., and service a UE in a vehicle, so as to overcome high path loss caused by a wireless signal passing through a carriage, and improve service quality. In-vehicle deployed IAB-nodes are also referred to herein as in-vehicle mobile relay (vehicle mobile relay, VMR) IAB-nodes or in-vehicle mobile IAB nodes. Because of the high dynamics of off-board UEs relative to vehicles, off-board UEs typically do not access the on-board mobile IAB-node and need to access the ground base station. During the running of the vehicle, UEs in the vehicle are all connected with the vehicle-mounted mobile IAB-node through an NR Uu interface, and UEs outside the vehicle are all connected with an access device (e.g., eNodeB or gNB) of a cell with the best signal quality through the NR Uu interface.

Referring to fig. 3, fig. 3 is a schematic diagram of an IAB network architecture. The IAB network architecture shown in fig. 3 is exemplified by a Stand Alone (SA) networking, and the IAB-donor may be composed of a Centralized Unit (CU) and a Distributed Unit (DU), that is, splitting functions of the IAB-donor, deploying part of the functions on one CU, deploying the rest of the functions on the DU, sharing one CU by a plurality of DUs, which can save costs, and facilitate network expansion. The CU and the DU are connected through an F1 interface. CU stands for IAB-donor connected to core network via Next Generation (NG) interface, CU stands for IAB-donor connected to other gNB via Xn interface.

The IAB-node DU is logically connected to the IAB-donor CU through an F1 interface, and in fact, the connection of the IAB-node DU to the IAB-donor CU is implemented through an NR Uu interface between the IAB-node MT and the parent node DU of each hop, but since the final IAB-node DU can communicate with the IAB-donor CU, it can be considered that an F1 interface logically exists, both of which can interact with control plane (F1-control plane, F1-C) information and user plane (F1-U) information through the F1 interface. The MT function of the IAB-node is defined as a component like a UE. In an IAB network, an MT is referred to as a function residing on an IAB-node. Since the MT functions like a normal UE, the IAB-node can be considered to be accessed to a higher node or network through the MT.

The present application refers to the following network elements/modules:

IAB node: for providing access and wireless backhaul services for a child node or UE;

IAB-donor (or host node called host node or IAB node): the base station supporting the IAB node may specifically include an IAB-donor-CU, and at least one IAB-donor-DU. Alternatively, the IAB-donor-CU may comprise one IAB-donor-CU-CP, and at least one IAB-donor-CU-UP. Wherein IAB-donor-CU-CP and IAB-donor-CU-UP represent Control Plane (CP) and User Plane (UP) of IAB-donor-CU, respectively;

gNB: and the 5G type base station is used for providing access and backhaul service for the child node or the UE.

Alternatively, IAB-donor in the present application may be gNB.

The communication method provided by the present application is described below.

The application mainly aims to solve the problem of radio resource control (radio resource control, RRC) connection interruption caused by the rapid start of a vehicle of a get-off UE or a get-on UE in a vehicle-mounted mobile IAB scene of public transportation means such as subways, buses and the like.

In order to solve the above-described problems, a first event, a second event, and a third event are defined in the present application.

Wherein, the first event (hereinafter referred to as N1 event) and the third event (hereinafter referred to as N3 event) are both detected and determined by the vehicle access node (e.g., vehicle mobile IAB node), respectively described below.

N1 event: the vehicle with the vehicle-mounted access node is changed from running to parking.

The N1 event is a neighbor cell measurement trigger event and is used for detecting the motion state of a vehicle by a vehicle-mounted mobile IAB node deployed in the vehicle. Upon detecting the occurrence of the N1 event, the mobile IAB node on-board represents that the vehicle has stopped traveling.

Specifically, the in-vehicle access node may determine whether to generate the N1 event according to one of the following methods or any combination of the methods.

Method 1: when the vehicle-mounted access node communicates with the access equipment of the service cell, the variation or the discrete degree of the RSRP of the service cell in a period of time is smaller than or equal to a set threshold.

Illustratively, the MT of the vehicle access node periodically measures the value of RSRP of the serving cell while communicating with the base station of the serving cell, and determines that an N1 event occurs if the variance or standard deviation (which may be other measurement parameter) of the value of RSRP of the serving cell measured multiple times over a period of time (e.g., 3 seconds) is less than or equal to a set threshold.

Method 2: when the vehicle-mounted access node communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is smaller than or equal to a set threshold.

Illustratively, when the MT of the in-vehicle access node communicates with the base station of the serving cell, if the variation of the best beam (best beam) of the maximum value of the RSRP of the serving cell is measured for a period of time to be less than or equal to a set threshold, for example, the number of best beams measured in 3 seconds is accumulated to be less than or equal to 2, or the duration of each best beam measured in 3 seconds is greater than 2 seconds, then it is determined that the N1 event occurs.

The method 3 is that the variation or the discrete degree of the timing advance TA indicated by the access equipment of the service cell of the vehicle-mounted access node in a period of time is smaller than or equal to a set threshold.

Illustratively, the MAC layer of the MT of the in-car access node determines from receipt of a timing advance command (timing advance command, TA command) sent by the serving base station. If the variance or standard deviation of the timing advance measured multiple times over a period of time (e.g., 3 seconds) is less than or equal to a set threshold, then an N3 event is determined to occur.

Alternatively, the vehicle access node may combine the above methods to determine the occurrence of the N1 event, for example, and without limitation, combine method 1 and method 2, or combine method 2 and method 3 together.

For example, the method 2 may be used as a supplement to the method 1, for example, when the vehicle in which the vehicle-mounted mobile IAB node is located moves in an arc with the IAB-donor (or the IAB parent node) as the center, the average value of RSRP of the serving cell measured by the vehicle-mounted mobile IAB node during a period of time may not change greatly, and the method 1 is not applicable. At this time, method 2 is supplemented to determine that preparation is to be compared. If the vehicle with the vehicle-mounted mobile IAB node leaves or moves to the IAB-donor (or IAB parent node) with the ray direction of the vehicle with the IAB-donor (or IAB parent node) as the center point, the method 1 is not applicable, and the method 1 can accurately determine the generation of the N1 time.

Alternatively, as an alternative expression, the N1 event may also be defined as:

when MT of the vehicle-mounted access node communicates with access equipment of a serving cell, the variation or the discrete degree of RSRP of the serving cell in a period of time is smaller than or equal to a set threshold; and/or the number of the groups of groups,

when MT of the vehicle-mounted access node communicates with access equipment of a serving cell, the variation or the discrete degree of a wave beam corresponding to the maximum value of RSRP of the serving cell in a period of time is smaller than or equal to a set threshold; and/or the number of the groups of groups,

the MAC layer of MT of the vehicle-mounted access node determines the timing advance N based on the received timing advance TA command sent by the access equipment of the service cell _TA The amount of change or degree of dispersion over a period of time is less than or equal to a set threshold.

N3 event: the vehicle with the vehicle-mounted access node is changed from parking to running.

The N3 event is a neighbor cell measurement termination event and is used for detecting the motion state of a vehicle by a vehicle-mounted mobile IAB node deployed in the vehicle. Upon detecting the occurrence of the N3 event, the mobile IAB node on board the vehicle changes from parked to running or the vehicle is restarted.

Specifically, the in-vehicle access node may determine whether an N3 event is generated according to one of the following methods or any combination of the methods.

Method 1: when the vehicle-mounted access node communicates with the access equipment of the service cell, the variation or the discrete degree of the RSRP of the service cell in a period of time is larger than or equal to a set threshold.

For example, when the vehicle-mounted mobile IAB node communicates with the base station of the serving cell, RSRP of the serving cell is periodically measured, and if the variance or standard deviation of the values of RSRP of the serving cell measured multiple times over a period of time (for example, 3 seconds) is greater than a set threshold, it is determined that an N3 event occurs.

Method 2: when the vehicle-mounted access node communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is larger than or equal to a set threshold.

For example, when the MT of the mobile IAB node on the vehicle communicates with the base station of the serving cell, if the variation of the best beam corresponding to the maximum value of RSRP of the serving cell measured for a period of time is greater than a set threshold, for example, the number of best beams measured in 3 seconds is cumulatively greater than 3, or the duration of each best beam measured in 3 seconds is less than 1.8 seconds, then it is determined that the N3 event occurs.

Method 3: the variation or the discrete degree of the timing advance TA indicated by the access equipment of the service cell of the vehicle-mounted access node in a period of time is larger than or larger than a set threshold.

Illustratively, the MAC layer of the MT of the in-car access node is determined based on the received TA command sent by the serving base station. If the variance or standard deviation of the timing advance measured multiple times over a period of time (e.g., 3 seconds) is greater than a set threshold, then an N3 event is determined to occur.

Alternatively, the on-board access node may combine the above schemes to determine the occurrence of the N3 event, for example, combining method 1 and method 2, or combining method 2 and method 3 together, or combining method 1, method 2, and method 3 together.

Alternatively, as an alternative expression, the N3 event may also be defined as:

when MT of the vehicle-mounted access node communicates with access equipment of a serving cell, the variation or the discrete degree of RSRP of the serving cell in a period of time is larger than or equal to a set threshold; and/or the number of the groups of groups,

when MT of the vehicle-mounted access node communicates with access equipment of a serving cell, the variation or the discrete degree of a wave beam corresponding to the maximum value of RSRP of the serving cell in a period of time is larger than or equal to a set threshold; and/or the number of the groups of groups,

the vehicle-mounted access node determines a timing advance N based on a timing advance TA command from an access device of a serving cell _TA The amount of change or degree of dispersion over a period of time is greater than or greater than a set threshold.

In addition, a second event (hereinafter, referred to as an N2 event) is detected and decided to be generated by the terminal device.

N2 event: the terminal device and the source node are relatively moved.

The N2 event is a neighbor cell measurement reporting event, and is used for detecting whether the terminal equipment gets on or off the vehicle and restarting the vehicle to leave after stopping. For a UE that is located in a vehicle before the vehicle is parked, the N2 event is specifically that the UE takes a get-off action, and the vehicle starts to get off again after parking, and the get-off UE is connected to the vehicle-mounted mobile IAB before the vehicle is stopped. For a UE that is located outside the vehicle before the vehicle is parked, the N2 event is specifically that the UE gets on the vehicle, and the off-vehicle UE connects to other access nodes, such as a ground base station, etc., besides the on-vehicle mobile IAB node before getting off.

Specifically, the terminal device may determine whether to generate the N2 event according to one of the following methods or any combination of the methods.

Method 1: when the terminal equipment communicates with the access equipment of the service cell, the variation or the discrete degree of the Reference Signal Received Power (RSRP) of the service cell in a period of time is larger than or equal to a set threshold.

Illustratively, the UE periodically measures the value of RSRP of the serving cell while communicating with the base station of the serving cell, and determines that an N2 event occurs if the variance or standard deviation (which may be other measurement parameter) of the value of RSRP of the serving cell measured multiple times over a period of time (e.g., 3 seconds) is greater than a set threshold.

Method 2: when the terminal equipment communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is larger than or equal to a set threshold.

For example, when the UE communicates with the base station of the serving cell, if the variation of the best beam corresponding to the maximum value of RSRP of the serving cell measured for a period of time is greater than a set threshold, for example, the number of best beams measured in 3 seconds is accumulated to be greater than 2, or the duration of each best beam measured in 3 seconds is less than 2 seconds, then it is determined that the N2 event occurs.

Method 3: the variation or the discrete degree of the timing advance TA indicated by the access equipment of the serving cell of the terminal equipment in a period of time is larger than or equal to a set threshold.

Alternatively, the N2 event may also be defined as:

when the terminal equipment communicates with the access equipment of the service cell, the variation or the discrete degree of the RSRP of the service cell in a period of time is larger than or equal to a set threshold; and/or the number of the groups of groups,

When the terminal equipment communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is larger than or equal to a set threshold; and/or the number of the groups of groups,

the variation or the discrete degree of the timing advance TA indicated by the access equipment of the serving cell of the terminal equipment in a period of time is larger than or equal to a set threshold.

Alternatively, in general, the UE stopping neighbor cell measurement needs to occur after reporting the measurement triggering the cell handover or after the cell handover is completed, so that the vehicle-mounted mobile IAB node perceives that the vehicle motion is a period of time after the UE perceives the vehicle motion, and thus the N3 event preferably occurs after the N2 event. In an implementation, this may be achieved by setting the threshold for generating N3 events to be higher than the threshold for generating N2 events.

The above describes the method of determining the occurrence of N1, N2 and N3 events, and how these events are used in a specific scenario will be described below.

In addition, in the embodiment provided by the application, the judgment of the vehicle motion state of the vehicle-mounted mobile IAB node is based on radio resource management (radio resource management, RRM) measurement, and vehicle-mounted global positioning system (global positioning system, GPS) positioning equipment or a speed sensor and the like can be adopted as the judgment basis for stopping and starting the vehicle.

In the on-vehicle mobile IAB scenario, for one UE, the UE is located in the vehicle where the on-vehicle mobile IAB node is located, and for another possible scenario, the UE is located outside the vehicle where the on-vehicle mobile IAB node is located. In the following, how to utilize the communication method provided by the application to reduce the occurrence of the RRC connection interruption of the UE after the vehicle in which the mobile IAB node is located is parked and during the restart and departure process will be described in detail.

Scene 1

In the initial state, the terminal equipment is positioned in a vehicle where the vehicle-mounted mobile IAB node is positioned, and the terminal equipment is accessed to the vehicle-mounted mobile IAB node. The vehicle mobile IAB accesses a certain IAB-donor (or called a home node), which is a source node (or source base station) of the terminal device.

It should be noted that the "initial state" as referred to herein refers to a state before the vehicle in which the in-vehicle mobile IAB node is located is parked.

In addition, the cell switching mode of the terminal equipment in the vehicle where the vehicle-mounted mobile IAB node is located is a group switching mode, wherein the group switching mode refers to that the terminal equipment accessing the vehicle-mounted mobile IAB node performs cell switching along with the vehicle-mounted mobile IAB as a group. In the group switch mode, the IAB-donor can treat the mobile IAB node and the terminal devices accessing the mobile IAB node as a "group" because the terminal devices accessing the mobile IAB node have similar mobility to the mobile IAB node, where the mobile IAB node is a "group head" and the terminal devices accessing the mobile IAB node are "group members". When cell switching is required, the IAB-donor performs group switching on them. In the group switching mode, terminal equipment in the group performs cell switching depending on neighbor cell measurement and measurement report of the group head, that is, the terminal equipment (or group member) in the group is not required to perform neighbor cell measurement and measurement report, and only the vehicle-mounted mobile IAB node performs neighbor cell measurement and measurement report, so that signaling overhead can be reduced, and power consumption of the terminal equipment in the group can be saved. Further, the IAB-donor performs the switching decision of the cell switching and executes the cell switching flow according to the measurement report of the vehicle-mounted mobile IAB node. When executing the switching, the source base station sends a group switching request to the target base station, and the target base station prepares switching related resources for all the UE in the group. In the switching execution process, UE in the group receives RRC reconfiguration information of the source base station through the vehicle-mounted mobile IAB node, and informs the target base station through the vehicle-mounted mobile IAB node after the reconfiguration is completed. In the VMR scenario, a terminal device joins a group with an on-board mobile IAB node as a group header once it accesses the IAB-donor (i.e., home base station) through the on-board mobile IAB node. After joining the group, which can be switched, a terminal device is in the group switching mode until leaving the group. The terminal devices after leaving the group are in normal handover mode.

The application of the scheme provided by the application in the process of converting the vehicle from running to parking in the vehicle where the vehicle-mounted mobile IAB node is located is described below.

Referring to fig. 4, fig. 4 is a schematic flow chart of a communication method provided by the present application.

410. The terminal device determines to generate a second event.

The second event is, for example, a relative movement of the terminal device and the vehicle access node.

The method for determining the generation of the second event by the terminal device may be referred to the above description, and will not be repeated.

In scenario 1, the source node of the terminal device is the home node of the vehicle-mounted mobile IAB node. In addition, in this scenario, the on-board access node is also referred to as an on-board mobile IAB node.

420. The terminal equipment sends a measurement report and first information of neighbor cell measurement to the vehicle-mounted access node, and the vehicle-mounted access node receives the measurement report and the first information from the terminal equipment.

Wherein the first information indicates that the measurement report is sent based on the second event.

Alternatively, the first information indicates that the terminal device wants to leave the source cell and the measurement reporting of the neighbor cell measurement is triggered by the second event. Alternatively, the first information indicates that the terminal device wants to leave the source cell and generates a second event.

Optionally, the measurement report contains the first information. Alternatively, the measurement report and the first information are transmitted separately, without limitation. Illustratively, the first information may be one cell (information element, IE) in the measurement report, such as a "triggered by N2 IE"; alternatively, the first information may be a message sent by the terminal device alone, and the message name may be a "triggered by N2 message".

Optionally, in this scenario, the source base station should quickly switch the terminal device to the target cell desired by the terminal device, so that, while sending the first information, the terminal device may indicate its desired target cell by explicit or implicit means, for example, directly indicate the physical cell identity of the target cell, or implicitly indicate by the neighbor cell with the largest RSRP value. And may be indicated by other means, without limitation.

430. And the vehicle-mounted access node sends the measurement report and the first information to the host node.

It should be appreciated that steps 420-430, i.e. the in-vehicle access node, send the received measurement report and the first information from the terminal device to the home node, which is the source node of the terminal device, via the backhaul link, to perform a handover decision for the cell handover by the source node.

It should be appreciated that the terminal device sends the first information to the home node through the vehicle-mounted access node to indicate that the measurement report is triggered based on the second event, so that the action of the terminal device leaving the vehicle-mounted mobile IAB node can only be triggered through the second event, so as to prevent the UE in the vehicle not getting off from being erroneously accessed to other ground access points outside the vehicle-mounted mobile IAB node.

440. And the host node executes the switching judgment of the cell switching of the terminal equipment according to the triggering events of the target cell and the measurement report.

Alternatively, the target cell may be determined by the host node from the measurement report. Since the home node receives the first information from the terminal device, it can be determined that the trigger event of the measurement report is the second event. The host node can learn that the terminal equipment has the getting-off behavior according to the second event. That is, the home node knows from the first information that the terminal device gets off and wishes to switch to a cell not managed by the in-vehicle mobile IAB node. The host node selects a target cell based on the measurement report. When selecting a target cell, the source base station needs to set the target cell as a cell managed by other access points except the vehicle-mounted access node. Optionally, the terminal device may also indicate its own desired target cell by explicit or implicit means, as described in step 420. In this implementation, the home node may directly obtain the target cell desired by the terminal device.

The source node determines to execute cell switching of the terminal equipment according to the first information in the case that the target cell is not a cell managed by the vehicle-mounted mobile IAB node. That is, the home node learns that the second event is generated at the terminal device and that the target cell for the cell handover is not a cell managed by the in-vehicle access node, the terminal device is allowed to be handed over from the source cell to the target cell.

Further, the method 400 also includes steps 450-460.

450. The home node sends a first message to the vehicle-mounted mobile IAB node, and the vehicle-mounted mobile IAB node receives the first message.

Wherein the first message instructs the terminal device to perform cell handover. The first message contains information of a target cell, and the target cell is managed by an access node outside a vehicle where the vehicle-mounted access node is located.

Alternatively, a cell is managed by an access node in this context, alternatively the cell may be provided by the access node, or the cell may be associated with the access node.

460. The vehicle-mounted mobile IAB node sends a first message to the terminal equipment, and the terminal equipment receives the first message.

And subsequently, after receiving the first message, the terminal equipment initiates random access to an access node of the management target cell and accesses the access node of the target cell.

Optionally, prior to step 410, the method 400 further comprises step 470.

470. The terminal equipment receives a second message from the vehicle-mounted mobile IAB node, and the second message instructs the terminal equipment to execute neighbor cell measurement. The second message is generated by detecting the N1 event by the vehicle-mounted mobile IAB node, and is sent to the vehicle-mounted mobile IAB node by the host node after being notified to the host node by the third message. The second message indicates the terminal equipment in the vehicle where the vehicle-mounted mobile IAB node is located to start neighbor cell measurement. Thus, the second message may be considered as a trigger message for neighbor cell measurements. After receiving the third message sent by the vehicle-mounted mobile IAB node and indicating to generate the N1 event, the host node sends the second message to the terminal equipment in the vehicle through the vehicle-mounted mobile IAB node so as to break up the group and stop the group switching mode. After each terminal device in the vehicle receives the second message, the neighbor cell measurement is started, and the common switching mode is entered.

The common switching mode means that each terminal device in the vehicle where the vehicle-mounted mobile IAB node is located needs to perform neighbor cell measurement and measurement reporting respectively. That is, after receiving the second message, the terminal device in the vehicle stops the group switching mode and shifts to the normal switching mode. At this time, each terminal device accessing the vehicle-mounted mobile IAB node in the initial state needs to perform neighbor cell measurement, so as to prepare for possible downlink behavior in advance. For a terminal device, in the process of making neighbor cell measurements, it is determined that a second event has occurred, and step 410 is entered.

It can be seen that in the method shown in fig. 4, the home node is notified when the on-board mobile IAB node detects that the vehicle is parked (i.e., an N1 event is generated). The host node informs terminal equipment in the vehicle of stopping the switching mode through the vehicle-mounted mobile IAB node, enters the common switching mode, and starts neighbor cell measurement so as to prepare for timely switching of the off-vehicle UE to an access point (such as a ground base station) outside the vehicle-mounted mobile IAB node in advance. When the UE detects that the N1 event is generated, namely, a measurement report of neighbor cell measurement is reported, and the N1 event is indicated to the source base station through the first information, the source base station timely switches the getting-off UE to an access point outside the vehicle-mounted mobile IAB node based on the first information, and the problem that after the vehicle is restarted, the UE and the source base station relatively move, specifically, a cell managed by the vehicle-mounted mobile IAB node is far away from the UE, so that the RRC connection of the UE is interrupted is avoided. Therefore, the terminal equipment reports the measurement of the neighbor cell measurement in advance until the terminal equipment senses that the terminal equipment gets off the vehicle and the vehicle starts again (namely, generates an N2 event), so that the terminal equipment can well cope with the high dynamic property of the vehicle.

(2) In the initial state, the terminal equipment is positioned outside the vehicle where the vehicle-mounted mobile IAB node is positioned, the terminal equipment is accessed to an access point outside the vehicle-mounted mobile IAB node, the access point is a source node of the terminal equipment, and a source cell of the terminal equipment is managed by the source node. In this scenario, in the initial state, the cell switching mode of the terminal device is the normal switching mode.

Referring to fig. 5, fig. 5 is another schematic flow chart of the communication method provided by the present application.

510. The terminal device determines to generate a second event.

Illustratively, the second event is a relative movement of the terminal device and the source node.

The method for determining the generation of the second event by the terminal device is referred to above and will not be described here.

520. The terminal device sends a measurement report of neighbor cell measurement and first information to the source node, wherein the first information indicates that the measurement report of neighbor cell measurement is triggered based on a second event.

530. And the source node executes the switching judgment of the cell switching of the terminal equipment according to the triggering events of the target cell and the measurement report.

Specifically, the source node selects a target cell according to the measurement report of the terminal device. In addition, since the source node also receives the first information from the terminal device, the trigger event of the measurement report is known to be the second event. The source node can learn that the terminal device has a loading behavior according to the second event, in this case, if the target cell is a cell managed by the vehicle-mounted mobile IAB node, the source node determines to perform cell switching of the terminal device, that is, allows the terminal device to be switched from the source node to the target cell.

540. The source node sends a first message to the terminal device, and the terminal device receives the first message.

The first message indicates the terminal equipment to execute cell switching, the first message contains information of a target cell, and the target cell is a cell managed by the vehicle-mounted mobile IAB node.

Further, the terminal device switches to the target cell according to the first message, that is, accesses the vehicle-mounted mobile IAB node.

In the flow of fig. 5, in the initial state, the terminal device is located outside the vehicle in which the vehicle-mounted mobile IAB node is located, and through the flows 510-540, the terminal device is switched from the source cell to the target cell managed by the vehicle-mounted mobile IAB node, and the vehicle-mounted mobile IAB node is accessed.

Optionally, prior to step 510, method 500 further comprises step 550.

550. The terminal equipment starts neighbor cell measurement.

When a vehicle in which the vehicle-mounted mobile IAB node is located arrives near the terminal equipment, a cell managed by the vehicle-mounted mobile IAB node is called a neighboring cell of a source cell provided by the source node. At this time, the source node may instruct the terminal device to start neighbor cell measurement. Or when the terminal equipment receives the information from the source node that the cell managed by the vehicle-mounted mobile IAB node is found to be the neighbor cell thereof in the system information, the neighbor cell measurement is started. The neighbor cells measured by the terminal equipment must include cells managed by the mobile IAB node in the vehicle. In the process of performing neighbor cell measurement, if the terminal device determines that the second event is generated, it proceeds to step 510.

It can be found that, in the method shown in fig. 5, when the vehicle in which the mobile IAB node is located approaches to the UE outside the vehicle, the UE outside the vehicle starts the neighbor cell measurement, and in the case that it is determined that the second event occurs in the measurement process, reports the measurement report of the neighbor cell measurement and the first information to the source base station, where the first information indicates that the N1 event occurs. The source base station knows that the UE gets on the vehicle based on the first information, and hopes to switch to a cell managed by the vehicle-mounted mobile IAB node, then the source base station allows the UE to switch from the source cell to the cell managed by the vehicle-mounted mobile IAB node (namely, the target cell), so that the problem that the RRC connection between the UE and the source base station is interrupted after the vehicle is started again and the UE is connected to the source base station after the vehicle is rapidly separated is avoided. In the embodiment of the application, the UE advances the measurement and the measurement report of the neighbor cells until the UE senses that the vehicle gets on the vehicle and the vehicle is started again, so that the advanced switching is realized, and the method and the device can be well adapted to the dynamic property of the vehicle.

In the two scenes, the vehicle with the vehicle-mounted mobile IAB node is changed from running to parking. During parking, some off-board UEs experience on-board behavior into the vehicle and some off-board UEs experience off-board behavior out of the vehicle. After the vehicle is restarted, the in-vehicle mobile IAB node determines that a third event is generated, at which point the flow shown in fig. 6 is executed.

Referring to fig. 6, fig. 6 is another exemplary flowchart of a communication method provided by the present application.

610. The in-vehicle mobile IAB node determines that a third event is generated.

Illustratively, the third event is the vehicle in which the mobile IAB node is located transitioning from stopped to traveling.

The method for determining the generation of the third event by the vehicle-mounted mobile IAB node is referred to the above description, and will not be repeated.

620. The in-vehicle mobile IAB node sends a fifth message to the home node, the fifth message indicating that a third event is generated.

630. And the vehicle-mounted mobile IAB node receives a fourth message from the host node, the fourth message indicates the terminal equipment in the vehicle where the vehicle-mounted mobile IAB node is positioned to stop neighbor cell measurement, and the cell switching mode is converted into the group switching mode.

After the vehicle-mounted mobile IAB node receives the fifth message, the vehicle-mounted mobile IAB node knows that a third event is generated, and at the moment, the host node sends a fourth message to the vehicle-mounted mobile IAB node, wherein the fourth message aims at enabling each UE in the vehicle to stop neighbor cell measurement and changes from a normal switching mode to a group switching mode.

640. And the vehicle-mounted mobile IAB node sends a fourth message to the terminal equipment in the vehicle where the vehicle-mounted mobile IAB node is located.

650. And stopping neighbor cell measurement by the terminal equipment in the vehicle where the vehicle-mounted mobile IAB node is located, and entering a group switching mode.

It should be understood that after the terminal device in the vehicle where the vehicle-mounted mobile IAB node is located enters the group switching mode, until the vehicle-mounted mobile IAB node detects the first event again, the vehicle where the vehicle-mounted mobile IAB node is located is in a running state, and in this process, the UE in the vehicle joins the group with the vehicle-mounted mobile IAB node as the group head, and works in the group switching mode, so that power consumption of the UE in the vehicle can be saved.

The communication method provided by the application is described above. It can be seen that the above scenario mainly relates to the terminal device in the vehicle where the vehicle-mounted mobile IAB node is located getting off and the terminal device outside the vehicle where the vehicle-mounted mobile IAB node is located getting on. In addition, the situation that the terminal equipment located in the vehicle where the vehicle-mounted mobile IAB node is located is not taken off after the vehicle is parked or the terminal equipment located outside the vehicle where the vehicle-mounted mobile IAB node is located is not taken on after the vehicle is parked may be related.

Scene example 1

Originally in-car UE gets off after the vehicle stops

Referring to fig. 7, fig. 7 is an example of cell handover performed by a UE according to the present application.

10. In the initial state, the UE works in a group switching mode, does not execute neighbor cell measurement and reporting, and performs group switching together with the vehicle-mounted mobile IAB node when needed.

11. And judging that an N1 event occurs by the vehicle-mounted mobile IAB node, and indicating that the vehicle in which the vehicle-mounted mobile IAB node is positioned is changed from running to parking. At this time, the vehicle-mounted mobile IAB node notifies the host node of generating the N1 event, and the host node notifies the UE in the vehicle to stop the group switching mode through the vehicle-mounted mobile IAB node, and starts the neighbor cell measurement. And stopping the group switching mode by the UE in the vehicle, starting neighbor cell measurement, and entering a common switching mode.

The UE may take several cases in performing neighbor cell measurements as follows.

Case 1

UE (e.g., UE1 in a vehicle) determines to generate an N2 event

12. And the UE judges that an N2 event is generated, namely the UE and the vehicle-mounted mobile IAB node deployed in the vehicle move relatively, so that the UE gets away from the vehicle gradually or the vehicle starts to get away immediately after getting off the vehicle.

13. The UE sends a measurement report of neighbor cell measurements to a home node of the vehicular mobile IAB node, and sends first information to the home node, the first information indicating that the measurement report is sent based on an N2 event.

Case 2

UE determines that no N2 event has occurred

Option1 (option 1)

14. And the UE judges that the N2 event is not generated, generates the A3 or A5 event, and does not execute measurement report of neighbor cell measurement.

Consider that the RSRP of the neighbor cell signal is found to be inherently higher than the serving cell managed by the in-vehicle mobile IAB node by a certain threshold, possibly due to the value of RSRP dropping between the UE getting off and the in-vehicle mobile IAB node, or due to the UE performing neighbor cell measurements. In order to avoid the error switching of the non-off-car UE to the ground access node, the cell switching of the UE can be triggered only through an N2 event when the source node is IAB-donor, so that the UE does not execute measurement reporting under the condition, and continues neighbor cell measurement until the occurrence of the N2 event is judged.

Option2 (option 2)

15. And the UE judges that the N2 event is not generated, the A3 event or the A5 event is generated, the UE reports the measurement of the neighbor cell measurement to the host node of the vehicle-mounted mobile IAB node, and the UE does not send the first information.

16. If the vehicle-mounted mobile IAB receives the measurement report of the UE, reporting the measurement report to the host node so that the host node can execute the handover decision.

Alternatively, if the home node receives the first information from the UE, the home node selects a target cell according to the measurement report and initiates handover preparation to an access device (hereinafter referred to as a target access device) managing the target cell. The target cell is managed by other access points or access equipment except the vehicle-mounted mobile IAB node.

Optionally, if the host node does not receive the first information from the UE, the host node does not initiate handover until an N2 event occurs, thereby ensuring that the UE on the vehicle leaves the mobile IAB node only triggered by the N2 event.

17. Cell switching execution flow.

Specifically, the target access device sends a message to the home node that the handover preparation was successful. The home node sends an RRC reconfiguration message to the UE through the in-vehicle mobile IAB node. The home node sends SN STATUS TRANSFER to the target access device. The UE initiates random access to the target access device. After the random access is completed, the target access device requests path switching update to the core network, and the core network feeds back the path switching update to the target access device. The target access device informs the home node to release the UE context. So far, the UE has completed the handover from the in-vehicle mobile IAB node to the target access device.

In the field Jing Shili, when the vehicle-mounted mobile IAB node senses that the vehicle is parked, the vehicle-mounted mobile IAB node notifies the host node, and the host node notifies the UE in the vehicle to stop the group switching mode through the vehicle-mounted mobile IAB node, enters the normal switching mode, and starts neighbor cell measurement, so that the UE in the vehicle can be timely switched to the ground access device outside the vehicle-mounted mobile IAB node. The UE advances the time for reporting the measurement of the neighbor cell measurement to the time when the N2 event is perceived to be generated (namely, the UE perceives that the UE gets off and is far away from the vehicle where the vehicle-mounted mobile IAB node is located), so that the advanced switching can be realized, the dynamic performance of the vehicle can be dealt with, and the switching success rate is improved.

Scene example 2

Originally off-board UE gets on the vehicle after the vehicle is stopped

Referring to fig. 8, fig. 8 is another example of cell handover performed by a UE provided by the present application.

30. In the initial state, the UE operates in the normal handover mode, but does not initiate neighbor cell measurements.

31. The cell managed by the vehicular mobile IAB node appears in the neighbor list of the source node, indicating that the vehicular mobile IAB node comes near the UE.

At this time, one possible implementation is: the source node adds a cell managed by the vehicle-mounted mobile IAB node in the broadcasted system message, and when the cell managed by the vehicle-mounted mobile IAB node is found to be a neighbor cell in the system message received by the UE in the service cell of the source node, neighbor cell measurement is started. In another possible implementation, the source node sends a message directly to the UE in the serving cell to instruct the UE to initiate neighbor cell measurements, and the neighbor cell must include a cell managed by the mobile IAB node in-vehicle.

Case 1

UE2 (e.g.) decides to generate an N2 event

32. The UE2 determines that an N2 event is generated indicating that the UE is entering the vehicle in which the mobile IAB node is located and the vehicle is started again, so that the UE and the source node move relatively.

33. The UE2 transmits a measurement report of neighbor cell measurements and first information to the source node, the first information indicating that the measurement report is transmitted based on the N2 event.

Case 2

UE determines that no N2 event has occurred

Option1 (option 1)

34. UE2 determines that no N2 event is generated, generating an A3/A5 event.

Considering that occlusion may occur between the source node and the UE2 due to the UE2 getting on-board, thereby causing the value of RSRP between the UE2 and the source node to drop, or because the UE2 performs neighbor cell measurement, it is found that the value of RSRP of the cell managed by the mobile IAB node in the vehicle is inherently higher than the value of RSRP of the source cell by a threshold. To avoid erroneous access to the mobile IAB node in the vehicle by the non-on-board UE, the UE2 starts a timer (if not already started). The timer on the UE side is hereinafter referred to as a first timer. Illustratively, the countdown of the first timer may be on the order of minutes.

When the first timer of the UE2 does not expire, measurement reporting is not performed, and neighbor cell measurement is continuously performed until the UE2 determines that an N2 event occurs. After the N2 event occurs, UE2 performs measurement reporting and sends the first information.

When the first timer of the UE2 expires (or the first timer expires), or the source cell signal is too bad (e.g. the value of RSRP of the source cell is below a threshold), the measurement reporting may be triggered by an A3/A5 event. At this time, UE2 transmits a measurement report of neighbor cell measurement and TIMER timeout information, for example, UE TIMER expiration information, to the source node. Here, the timer timeout information is one example of the second information. Alternatively, the UE TIMER EXPIRED information may be carried in the measurement report, or the UE2 may send the UE TIMER EXPIRED information and the measurement report separately. The source node determines to perform cell switching on UE2 according to the received TIMER detected information from UE 2.

It should be noted that, in the case that the UE2 determines that the N2 event is not generated and the A3/A5 event is generated, the UE2 sends UE TIMER explicit information to the source node if the first TIMER expires or the source cell signal is too bad, and the source node determines to perform cell handover based on the received UE TIMER explicit information, which belongs to two exceptions that the source node allows the UE2 to access the vehicle-mounted mobile IAB node in the case that the N2 event is not generated.

It should be appreciated that in one of these two exceptions, UE2 would otherwise be outside of the vehicle in which the mobile IAB node is located, during the process of performing neighbor cell measurements, UE2 decides that no N2 event is generated, resulting in an A3/A5 event. At this time, the UE2 starts a first TIMER, and sends a measurement report of neighbor cell measurement to the source node when the first TIMER expires, and sends TIMER expiration information (for example, UE TIMER explicit information) to indicate that traffic congestion occurs, and the vehicle in which the mobile IAB node is located is stationary for a long time due to congestion, so that the UE2 may be allowed to switch to a cell managed by the mobile IAB node. Another exception is that UE2 decides that no N2 event is generated, an A3/A5 event is generated. In case the source cell signal is too bad (e.g. the value of RSRP of the source cell signal is below a threshold), the UE2 sends a measurement report to the source node, while simultaneously sending UE TIMER explicit information to the source node. The source node allows UE2 to access the mobile IAB node in-vehicle after receiving the measurement report and the UE TIMER extended information. It can be seen that these two exceptions are respectively to make it possible for a UE outside the vehicle in which the mobile IAB node is located to access the mobile IAB node in case of traffic congestion and too bad a source cell signal.

When the UE2 determines that the A3/A5 event is initiated by the higher value (which may be compared with the set threshold) of the RSRP of the cell managed by the vehicular mobile IAB node, the UE2 does not perform measurement reporting of neighbor cell measurements, and continues the measurement until it is determined that the N2 event is generated.

Option2 (option 2)

35. UE2 determines that no N2 event is generated, an A3 or A5 event is generated, UE2 transmits a measurement report of neighbor cell measurement to the source node, but UE does not transmit the first information.

If the source node receives a measurement report from UE2, the source node performs a handover decision as in step 36.

36. In one case, the source node receives the measurement report and the first information from the UE2, and then selects a cell managed by the vehicular mobile IAB node as a target cell, and initiates handover preparation to the home node (i.e., IAB-donor) of the vehicular mobile IAB node, and proceeds to step 37.

In another case, the source node receives the measurement report from the UE but does not receive the first information, and the source node determines that the target cell is a cell managed by the vehicular mobile IAB node, then the source node does not initiate handover temporarily, and starts a timer, hereinafter referred to as a second timer on the network side. Illustratively, the level of the second timer may be a minute level. Before the second timer times out, UE2 continues to perform neighbor cell measurements until an N2 event is generated and measurement reporting is triggered, or until the target cell is no longer a cell managed by the mobile IAB node in the vehicle (meaning that UE2 is always off-vehicle), or until the second timer of the source node times out or the source cell signal is too bad (e.g., the value of RSRP of the source cell is below a threshold), the source node determines to perform a cell handover for UE 2. The source node initiates a handover preparation to the IAB-node and proceeds to step 37.

Similarly, the source node side maintains the second timer and allows the cell handover of the UE2 when the second timer expires or when the value of RSRP of the source cell signal is lower than the threshold value, also for the purpose of enabling the UE outside the vehicle to access the vehicle-mounted mobile IAB node when the vehicle in which the vehicle-mounted mobile IAB node is located is stationary for a long time due to congestion and when the source cell signal is too bad.

In case the source node receives the measurement report and the first information, or in case the source node receives the measurement report and TIMER timeout information (e.g. the UE TIMER explicit information as above), or in case the source node receives the measurement report triggered by the A3/A5 event from the UE and the second TIMER times out, or in case the source node receives the measurement report triggered by the A3/A5 event from the UE, while the source node determines that the value of RSRP of the source cell signal is below a threshold, the source node determines to perform a cell handover for the UE, in particular the source node allows the UE to access the mobile IAB node in-vehicle. At this time, the source node initiates handover preparation to the target base station (specifically, the IAB-donor of the vehicular mobile IAB node in this scenario).

37. Cell switching execution flow.

The IAB-donor sends a message to the source node that the handover preparation is successful. The source node performs RRC reconfiguration for the UE. The source node sends SN STATUS TRANSFER to the IAB-node. The UE initiates random access to the vehicle-mounted mobile IAB node. After the random access is completed, the IAB-donor requests path switching update to the core network, and the core network feeds back the path switching update to the IAB-donor. The IAB-donor informs the source node to release the UE context. So far, the UE has completed the handover from the source node to the target base station, i.e. UE2 has accessed the mobile IAB node in the vehicle.

Optionally, the following steps 38-39 may also be included.

38. The vehicle-mounted mobile IAB node judges that the N3 event is generated, and the vehicle-mounted mobile IAB node sends a fifth message to the IAB-donor, and the fifth message indicates that the N3 event is generated. Here, the N3 event is that the vehicle in which the in-vehicle mobile IAB node is located changes from parking to running.

39. And the IAB-donor informs the UE in the vehicle where the vehicle-mounted mobile IAB node is positioned to stop neighbor cell measurement through the vehicle-mounted mobile IAB node, and the mode is changed from the normal switching mode to the group switching mode.

Scene example 3

Original on-board UE, and UE not getting off after the vehicle is stopped

50. In the initial state, the UE works in a group switching mode, does not execute neighbor cell measurement and reporting, and performs group switching together with the vehicle-mounted mobile IAB node when needed.

51. And the vehicle-mounted mobile IAB node judges that an N1 event is generated, and indicates that the vehicle in which the vehicle-mounted mobile IAB node is located is changed from running to parking, at the moment, the vehicle-mounted mobile IAB node informs the host node of generating the N1 event, and the host node informs the UE in the vehicle to start neighbor cell measurement through the vehicle-mounted mobile IAB node. In-car UE pauses the group switching mode, enters the common switching mode and starts neighbor cell measurement.

Case 1

UE3 determines that no N2 event has occurred

52. And the UE3 judges that the N2 event is not generated and the A3/A5 event is not generated, the UE3 is always connected to the vehicle-mounted mobile IAB node, and no switching occurs.

53. The UE3 determines that the N2 event is not generated, generates an A3/A5 event, and the UE3 does not perform measurement reporting, continues measurement until the N2 event is generated, or until an instruction to stop neighbor cell measurement triggered by the N3 event is subsequently received. As described above, the indication to stop the neighbor cell measurement is sent by the home node to the in-vehicle terminal device via the in-vehicle mobile IAB node.

Mainly consider that the value of the RSRP of the neighbor cell is found to be higher than the value of the RSRP of the cell managed by the on-board mobile IAB node (i.e. the serving cell of the UE 3) by a certain threshold in the process of executing neighbor cell measurement. In order to avoid that the non-off-car UE is erroneously switched to the ground access node, when the source node is an IAB-donor, the cell switching of the UE can only be triggered by an N2 event, so that in this case, the UE3 does not perform measurement reporting.

54. The UE3 determines that the N2 event is not generated, generates the A3/A5 event, and the UE3 transmits a measurement report of neighbor cell measurement to the IAB-donor through the vehicular mobile IAB node, but the UE3 does not transmit the first information.

55. If the vehicle-mounted mobile IAB node receives the measurement report of the UE, reporting the measurement report to the IAB-donor, and executing the handover judgment by the IAB-donor.

Optionally, when performing the handover decision, since in scenario example 3, UE3 does not detect the generation of the N2 event, UE3 sends a measurement report of neighbor cell measurement to the IAB-node through the IAB node, but does not send the first information. Accordingly, if the IAB-donor receives the measurement report from the UE3 but does not receive the first information from the UE3, the IAB-donor does not initiate the handover.

Optionally, step 56 is also included.

56. The vehicle-mounted mobile IAB node judges that the N3 event is generated, and the vehicle-mounted mobile IAB node sends a third message to the IAB-donor, wherein the third message indicates that the N3 event is generated. And according to the third message, the IAB-donor informs the UE in the vehicle where the vehicle-mounted mobile IAB node is located to stop neighbor cell measurement through the vehicle-mounted mobile IAB node, and returns to the group switching mode from the normal switching mode.

Scene example 4

The UE originally outside the vehicle is not on the vehicle after the vehicle is stopped

Referring to fig. 10, fig. 10 is another example of cell handover performed by a UE provided by the present application.

60. In the initial state, the UE works in a normal switching mode and does not start neighbor cell measurement.

Originally, the UE outside the vehicle is initially accessed to an access node outside the vehicle where the vehicle-mounted mobile IAB node is located, and the access node outside the vehicle is the source node of the UE.

When the cell provided by the vehicle-mounted mobile IAB node appears in the neighbor cell list of the source node of the UE, the vehicle in which the vehicle-mounted mobile IAB node is positioned is indicated to come to the vicinity of the UE. At this time, the source node adds the cell managed by the vehicle-mounted mobile IAB node in the broadcasted system message, and when the UE discovers that the neighbor cell managed by the vehicle-mounted mobile IAB node is the neighbor cell thereof in the received broadcasted system message, the UE starts neighbor cell measurement; alternatively, the source node directly sends a message to the UE instructing the UE to initiate neighbor cell measurements and the neighbor cells must include cells managed by the vehicular mobile IAB node.

61. And the UE4 judges that the N2 event is not generated and the A3/A5 event is not generated, the UE is always accessed to the source cell, no switching occurs, and the flow is ended.

62. UE4 determines that no N2 event is generated, generating an A3/A5 event.

Option1 (option 1)

To avoid erroneous access to the mobile IAB node on board by an unaided UE, the UE4 starts a first timer (if not started) when the UE decides that the generation of an A3/A5 event is initiated by the higher value of RSRP of the cell managed by the VMR-IAB node. Before the first timer times out, the UE does not perform measurement reporting, and continues measurement until the A3/A5 event is initiated by the fact that the value of RSRP of the cell managed by the mobile IAB node is high (which can be determined by comparison with the set threshold).

When the first timer expires or the value of RSRP of the source cell is below a threshold (i.e. the source cell signal is too bad), the measurement reporting may be triggered by an A3/A5 event. At this time, the UE4 transmits a measurement report and UE TIMER explicit information to the source node, and discards the current first TIMER. The source node initiates a switching preparation to the target access equipment and executes switching. Therefore, the behavior of the UE accessing the vehicle-mounted mobile IAB node is triggered only through the N2 event when the vehicle is in a normal operation state. And when traffic jam occurs or the vehicle is completely stopped (for example, the vehicle reaches a terminal), or the signal quality of a source cell is too poor, the off-vehicle UE can access the cell managed by the vehicle-mounted mobile IAB node through an A3/A5 event.

Option2 (option 2)

UE4 decides that no N2 event is generated but an A3/A5 event is generated, UE4 sends a measurement report of neighbor cell measurement to the source node but does not send the first information.

63. And the source node performs handover decision if receiving the measurement report of the UE.

Optionally, if the source node receives the measurement report of the UE, and selects a target cell according to the measurement report, if the target cell is not a cell managed by the vehicle-mounted mobile IAB node, the source node initiates handover preparation to the target access node, and the target access node sends a message that the handover preparation is successful to the source node. And then entering a standard cell switching execution flow.

Optionally, if the source node receives the measurement report of the UE, and the target cell determined according to the measurement report is a cell managed by the vehicle-mounted mobile IAB node, but the source node does not receive the first information, and does not receive the UR TIMER EXPIRED information (an example of the second information), the source node does not initiate a cell handover temporarily, and starts the second TIMER. That is, in the case that the source node receives neither the first information indicating the generation of the N2 event nor the timer timeout information indicating the exceptional situation, the source node temporarily does not initiate the cell handover and starts the second timer.

Before the second timer times out, the UE continues to measure until the target cell becomes other cells not managed by the vehicle-mounted mobile IAB node, and the measurement report is performed again. If the target cell is always a cell managed by the vehicle-mounted mobile IAB node, but the second timer is overtime or the value of the RSRP of the source cell is lower than a set threshold, the source node allows the UE to access the vehicle-mounted mobile IAB node. Therefore, when the vehicle is in a normal operation state, the action of the UE accessing the vehicle-mounted mobile IAB node can be triggered only through an N2 event, and under the exceptional conditions that traffic jam occurs or the vehicle is completely stopped or the signal quality of a source cell is too poor, the off-vehicle UE can access the cell managed by the vehicle-mounted mobile IAB node based on the triggering of the A3/A5 event.

It should be appreciated that in field Jing Shili, the target access node is involved in a number of possible scenarios. For example, in the exceptional case that the second timer expires or the RSRP of the source cell is lower than the threshold value, the target cell is managed by the vehicular mobile IAB node, and the target access node at this time is the home node of the vehicular mobile IAB node, i.e., IAB-node. In another possible scenario, the target cell is not managed by the mobile IAB node on board, for example, but is managed by another access node (assumed to be access node a) other than the source node, which is the target access node, outside the vehicle.

It should be noted that, the present application is directed to the problem of cell switching caused by getting on/off the UE in the vehicular mobile IAB scenario, which is essentially the problem of active switching when the UE leaves or joins a "group" with mobility. The technical scheme of the application is not limited to the vehicle-mounted mobile IAB scene. For example, in subsequent evolution, the vehicle mobile IAB node and the UE may also exist in the form of a relay UE (i.e., relay UE) and a remote UE (i.e., remote UE), and the scheme of the present application is also applicable.

According to the above embodiment provided by the application, aiming at the problem that the group members in the group switching mode cannot be dynamically identified and the problem that the switching time is insufficient due to the fact that the UE gets on or off in the vehicle-mounted mobile IAB scene, the application provides a triggering event based on the perception of the movement state of the vehicle.

Specifically, a triggering event (i.e., a first event) of neighbor cell measurement is provided, based on the first event, an original group can be broken up when a vehicle is parked (because the User Equipment (UE) gets on or off after the vehicle is parked, the group members in a group switching mode can be considered to change once after each parking and restarting), and a vehicle-mounted mobile IAB node deployed in the vehicle notifies terminal equipment in the vehicle to independently perform neighbor cell measurement, so that the off-vehicle UE can be switched to a ground access point in time, and service interruption is reduced;

the trigger event (namely the second event) of measurement reporting is provided, and based on the second event, measurement reporting can be triggered when the on-board/off-board UE senses relative movement with the source node, so that the off-board UE is timely switched to the ground node, and the on-board UE is timely switched to the vehicle-mounted mobile IAB node deployed in the vehicle, so that early switching is realized, and the switching success rate is improved. The source node of the UE carries out switching judgment according to the triggering event reported by measurement and the target cell, and only receives switching triggered by the second event for the UE which hopes to be accessed or to leave the cell managed by the vehicle-mounted mobile IAB node, so that the UE which is not on the vehicle can be prevented from being accessed into the vehicle-mounted mobile IAB node by mistake and the UE which is not off the vehicle can be prevented from leaving the vehicle-mounted mobile IAB node by mistake.

The triggering event (namely, the third event) of the neighbor cell measurement termination is provided, the neighbor cell measurement is stopped when the vehicle is started again, the UE in the vehicle is informed to stop the neighbor cell measurement, a group is formed again, and a group switching mode is entered, namely, the vehicle-mounted mobile IAB node executes the neighbor cell measurement and measurement report, and the UE in the group does not independently execute the neighbor cell measurement and measurement report any more, so that the power consumption of the UE is saved.

The communication method provided by the application is described in detail above, and the communication device provided by the application is described below.

Referring to fig. 11, fig. 11 is a schematic block diagram of a communication device provided by the present application. As shown in fig. 11, the communication apparatus 1000 includes a processing unit 1100, a receiving unit 1200, and a transmitting unit 1300.

Alternatively, in one case, the communication apparatus 1000 may correspond to a terminal device in an embodiment of the present application.

In this case, each unit of the communication apparatus 1000 functions to realize the following functions:

the processing unit 1100 is configured to determine that a second event is generated, where the second event is that the communication device and the vehicle-mounted access node move relatively;

the sending unit 1300 is configured to send, to the vehicle access device, a measurement report of neighbor cell measurement and first information, where the first information indicates that the measurement report is sent based on the second event.

Optionally, in one embodiment, the processing unit 1100 is configured to determine to generate the second event when:

when the communication device communicates with the access equipment of the service cell, the variation or the discrete degree of the Reference Signal Receiving Power (RSRP) of the service cell in a period of time is larger than or equal to a first threshold; and/or the number of the groups of groups,

when the communication device communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is larger than or equal to a second threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the timing advance TA indicated by the access equipment of the serving cell of the communication device in a period of time is greater than or equal to a third threshold.

Optionally, in one embodiment, the receiving unit 1200 is further configured to receive a first message from the vehicle-mounted access device, where the first message instructs the communication apparatus to perform cell handover, and the first message includes information of a target cell, where the target cell is managed by an access device outside the vehicle where the vehicle-mounted access device is located.

Optionally, in an embodiment, before the communication device determines that the second event occurs, the communication device is located in a vehicle where the vehicle-mounted access device is located, and a mode of performing cell switching by the communication device is a group switching mode, where the group switching mode is that the communication device and other communication devices accessing the vehicle-mounted access device perform cell switching with the vehicle-mounted access device as a group, and neighbor cell measurement and measurement reporting of the cell switching in the group switching mode are performed by the vehicle-mounted access device.

Optionally, in an embodiment, the receiving unit 1200 is further configured to receive a second message from the vehicle-mounted access node, where the second message instructs the communication device to perform the neighbor cell measurement, the second message is sent by the source node when receiving a third message from the vehicle-mounted access device, and the third message indicates that a first event is generated, where the first event is that a vehicle where the vehicle-mounted access device is located changes from traveling to parking.

Optionally, in another embodiment, each unit of the communications apparatus 1000 is configured to implement the following functions:

the processing unit 1100 is configured to control the sending unit 1300 to send a measurement report of neighbor cell measurement and first information to a vehicle-mounted access node when:

The variation or the discrete degree of the timing advance TA indicated by the access equipment of the serving cell of the communication device in a period of time is larger than or equal to a third threshold;

the first information indicates that the measurement report is sent based on the second event, and the second event is that the communication device and the vehicle-mounted access node move relatively.

Optionally, in another embodiment, the processing unit 1100 is configured to determine to generate a second event, where the second event is that the communication device moves relatively to the source node;

the sending unit 1300 is configured to send a measurement report of neighbor cell measurement and first information to the source node, where the first information indicates that the measurement report is sent based on the second event.

Optionally, in another embodiment, the processing unit 1100 is configured to determine to generate the second event when:

Optionally, in another embodiment, the receiving unit 1200 is configured to receive a first message from the source node, where the first message instructs the communication device to perform cell handover, the first message includes information of a target cell, where the target cell is managed by an in-vehicle access device, and the source node is an access node outside a vehicle where the in-vehicle access device is located.

Optionally, in another embodiment, the processing unit 1100 is configured to switch to the target cell based on the first message;

the receiving unit 1200 is configured to receive a fourth message from the vehicle access device, where the fourth message instructs the communication apparatus to stop the neighbor cell measurement, and change the mode of cell switching to the group switching mode,

the fourth message is sent by the host node of the vehicle-mounted access device under the condition that a fifth message from the vehicle-mounted access device is received, the fifth message indicates to generate a third event, and the third event is that the vehicle where the vehicle-mounted access device is located is changed from parking to running;

And the group switching mode is that the communication device and other communication devices accessing the vehicle-mounted access equipment and the vehicle-mounted access equipment are used as a group to execute cell switching, and neighbor cell measurement and measurement reporting of the cell switching of the group switching mode are executed by the vehicle-mounted access equipment.

Alternatively, the communication apparatus 1000 may correspond to a source node in an embodiment of the present application.

the receiving unit 1200 is configured to receive a measurement report from a neighbor cell measurement of a terminal device;

the processing unit 1100 is configured to perform a handover decision for a cell handover of the terminal device according to a target cell and a trigger event of the measurement report, where the target cell is determined by the communication device according to the measurement report, and the trigger event of the measurement report includes a second event, and the second event is that the terminal device and the communication device move relatively.

Optionally, in one embodiment, the processing unit 1100 is configured to perform cell handover of the terminal device in a case where it is determined that the target cell is not managed by an in-vehicle access device and a trigger event of the measurement report is the second event.

Optionally, in one embodiment, the processing unit 1100 is configured to:

executing cell handover of the terminal device in a case that it is determined that the target cell is managed by the vehicle-mounted access device and the trigger event of the measurement report is an A3 event or an A5 event, and the receiving unit 1200 receives second information from the terminal device, where the second information is sent by the terminal device when a first timer expires, and the first timer is used to assist the handover decision; or,

and executing cell switching of the terminal equipment under the condition that the target cell is managed by the vehicle-mounted access equipment and the triggering event of the measurement report is an A3 event or an A5 event and the Reference Signal Received Power (RSRP) of the serving cell of the terminal equipment is lower than a set threshold value.

Optionally, in one embodiment, the processing unit 1100 is configured to:

executing cell switching of the terminal equipment under the condition that the target cell is determined to be managed by the vehicle-mounted access equipment and the triggering event of the measurement report is the second event; or,

executing cell switching of the terminal equipment under the condition that the target cell is determined to be managed by the vehicle-mounted access equipment, the triggering event of the measurement report is an A3 event or an A5 event, and the Reference Signal Received Power (RSRP) of a serving cell of the terminal equipment is lower than a set threshold value; or,

And executing cell switching of the terminal equipment when a second timer is timed out under the condition that the target cell is determined to be managed by the vehicle-mounted access equipment and the triggering event of the measurement report is an A3 event or an A5 event, wherein the second timer is used for assisting the switching judgment.

Optionally, in one embodiment, the receiving unit 1200 is configured to receive a fifth message from the vehicle-mounted access device, where the fifth message indicates that a third event is generated, and the third event is that the vehicle where the vehicle-mounted access device is located is changed from stop to running;

the sending unit 1300 is configured to send, based on the fifth message, a fourth message to a terminal device in a vehicle where the in-vehicle access device is located, where the fourth message instructs the terminal device to stop the neighbor cell measurement, and change a mode of cell switching to a group switching mode,

the group switching mode is that the terminal equipment and other terminal equipment which is accessed to the vehicle-mounted access equipment and the vehicle-mounted access equipment are used as a group to execute cell switching, and neighbor cell measurement and measurement reporting of the cell switching of the group switching mode are executed by the vehicle-mounted access equipment.

Optionally, in one embodiment, the receiving unit 1200 is configured to receive a third message from the vehicle-mounted access device, where the third message is sent by the vehicle-mounted access device when it is determined that a first event is generated, and the first event is that a vehicle where the vehicle-mounted access device is located changes from running to parking;

the sending unit 1300 is configured to send, based on the third message, a second message to a terminal device in a vehicle where the vehicle-mounted access device is located, where the second message instructs the terminal device in the vehicle where the vehicle-mounted access device is located to perform the neighbor cell measurement.

Alternatively, the communication apparatus 1000 may correspond to an in-vehicle access device in the embodiment of the present application.

the processing unit 1100 is configured to determine that a first event is generated, where the first event is that a vehicle in which the communication device is located changes from running to parking;

the sending unit 1300 is configured to send a third message to the host node, where the third message indicates that the first event is generated;

the receiving unit 1200 is configured to receive a second message from the host node, where the second message instructs a terminal device in a vehicle where the communication device is located to perform neighbor cell measurement;

The sending unit 1300 is configured to send the second message to a terminal device in the vehicle.

Optionally, in one embodiment, the processing unit 1100 is configured to determine to generate the first event when:

when the communication device communicates with the access equipment of the service cell, the variation or the discrete degree of the RSRP of the service cell in a period of time is smaller than or equal to a fourth threshold; and/or the number of the groups of groups,

when the communication device communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is smaller than or equal to a fifth threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the timing advance TA indicated by the access equipment of the serving cell of the communication device in a period of time is greater than or equal to a sixth threshold.

Optionally, in one embodiment, the processing unit 1100 is further configured to determine that a third event is generated, where the third event is that the vehicle in which the communication device is located is changed from parking to running;

the sending unit 1300 is configured to send a fifth message to the host node, where the fifth message indicates that the third event is generated;

The receiving unit 1200 is configured to receive a fourth message from the home node, where the fourth message instructs a terminal device in a vehicle where the communication device is located to stop the neighbor cell measurement, and change a mode of cell switching to a group switching mode,

the group switching mode is that the terminal equipment and other terminal equipment accessed to the communication device and the communication device are used as a group to execute cell switching, and neighbor cell measurement and measurement reporting of the cell switching of the group switching mode are executed by the communication device.

Optionally, in one embodiment, the processing unit 1100 is configured to determine that the third event is generated when:

when the communication device communicates with the access equipment of the service cell, the variation or the discrete degree of the RSRP of the service cell in a period of time is larger than or equal to a seventh threshold; and/or the number of the groups of groups,

when the communication device communicates with the access equipment of the service cell, the variation or the discrete degree of the wave beam corresponding to the maximum value of the RSRP of the service cell in a period of time is larger than or equal to an eighth threshold; and/or the number of the groups of groups,

the variation or the degree of dispersion of the timing advance TA indicated by the access device of the serving cell of the communication apparatus over a period of time is greater than or equal to the ninth threshold.

Optionally, in one embodiment, the receiving unit 1200 is configured to receive a measurement report of the neighbor cell measurement from a first terminal device, where the measurement report includes first information, and the first information indicates that the measurement report is sent based on a second event, where the second event is that the first terminal device moves relative to a source node;

the sending unit 1300 is configured to send the measurement report to the host node.

Optionally, in one embodiment, the receiving unit 1200 is configured to receive a measurement report of the neighbor cell measurement from a first terminal device and first information, where the first information indicates that the measurement report is sent based on a second event, where the second event is that the first terminal device moves relative to a source node;

the sending unit 1300 is configured to send the measurement report and the first information to the host node.

In the above embodiments, the receiving unit 1200 and the transmitting unit 1300 may be integrated into one transceiver unit, and have both functions of receiving and transmitting, which is not limited herein.

In embodiments of the communication apparatus 1000 corresponding to a terminal device, the processing unit 1100 is configured to perform processing and/or operations that are internally implemented by the terminal device, in addition to actions of transmitting and receiving. The reception unit 1200 is configured to perform an action of reception by the terminal device, and the transmission unit 1300 is configured to perform an action of transmission by the terminal device.

For example, in fig. 4, the processing unit 1100 performs step 410. The receiving unit 1200 performs step 450 and optionally step 470. The transmitting unit 1300 performs steps 420,460.

Also for example, in fig. 5, the processing unit 1100 is configured to perform step 510, and optionally step 550. The receiving unit 1200 performs step 540. The transmitting unit 1300 performs step 520.

As another example, in fig. 6, the receiving unit 1200 performs step 640.

In various embodiments of the communications apparatus 1000 corresponding to a source node, the processing unit 1100 is configured to perform processing and/or operations that are internally implemented by the source node in addition to the actions of transmitting and receiving. The receiving unit 1200 is configured to perform an action of receiving by the source node, and the transmitting unit 1300 is configured to perform an action of transmitting by the source node.

For example, in fig. 4, the processing unit 1100 performs step 440. The receiving unit 1200 performs step 430. The transmitting unit 1300 performs step 450, optionally step 470.

Also for example, in fig. 5, the processing unit 1100 performs step 530. The receiving unit 1200 performs step 520. The transmitting unit 1300 performs step 540.

Also for example, in fig. 6, the receiving unit 1200 performs step 620. The transmitting unit 1300 performs step 630.

In embodiments in which the communication apparatus 1000 corresponds to an in-vehicle access device, the processing unit 1100 is configured to perform processing and/or operations that are internally implemented by the in-vehicle access device, in addition to actions of transmitting and receiving. The receiving unit 1200 is configured to perform an action of receiving the in-vehicle access device, and the transmitting unit 1300 is configured to perform an action of transmitting the in-vehicle access device.

For example, in fig. 4, the receiving unit 1200 performs step 420, step 450. The transmitting unit 1300 performs step 430, step 460.

Also for example, in fig. 6, the processing unit 1100 performs step 610. The transmitting unit 1300 performs step 620, step 640. The receiving unit 1200 performs step 630.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a communication device provided by the present application. As shown in fig. 12, the communication apparatus 10 includes: one or more processors 11, one or more memories 12, and one or more communication interfaces 13. The processor 11 is configured to control the communication interface 13 to transmit and receive signals, the memory 12 is configured to store a computer program, and the processor 11 is configured to call and execute the computer program from the memory 12, so that the communication apparatus 10 performs the processing performed by the terminal device or the source node or the vehicle access device in the embodiments of the method of the present application.

For example, the processor 11 may have the functions of the processing unit 1100 shown in fig. a, and the communication interface 13 may have the functions of the receiving unit 1200 and/or the transmitting unit 1300 shown in fig. a. In particular, the processor 11 may be used to perform processes or operations performed internally by the communication device, and the communication interface 13 is used to perform operations of transmission and/or reception of the communication device.

In one implementation, the communication apparatus 10 may be a terminal device in a method embodiment. In such an implementation, the communication interface 13 may be a transceiver of the terminal device. The transceiver may include a receiver and/or a transmitter. Alternatively, the processor 11 may be a baseband device of the terminal device, and the communication interface 13 may be a radio frequency device.

In another implementation, the communication apparatus 10 may be a chip (or chip system) installed in a terminal device. In such an implementation, the communication interface 13 may be an interface circuit or an input/output interface.

In one implementation, the communication device 10 may be a source node in a method embodiment. In such an implementation, the communication interface 13 may be a transceiver of the source node. The transceiver may include a receiver and/or a transmitter. Alternatively, the processor 11 may be a baseband device of the source node, and the communication interface 13 may be a radio frequency device.

In another implementation, the communication device 10 may be a chip (or chip system) installed in the source node. In such an implementation, the communication interface 13 may be an interface circuit or an input/output interface.

In one implementation, the communication apparatus 10 may be an in-vehicle access device in a method embodiment. In such an implementation, the communication interface 13 may be a transceiver of the in-vehicle access device. The transceiver may include a receiver and/or a transmitter. Alternatively, the processor 11 may be a baseband device of the vehicle-mounted access device, and the communication interface 13 may be a radio frequency device.

In another implementation, the communication apparatus 10 may be a chip (or chip system) mounted in an in-vehicle access device. In such an implementation, the communication interface 13 may be an interface circuit or an input/output interface.

Wherein the dashed box behind a device (e.g., a processor, memory, or communication interface) in fig. 12 indicates that the device may be more than one.

Alternatively, the memory and the processor in the above apparatus embodiments may be physically separate units, or the memory may be integrated with the processor, which is not limited herein.

Furthermore, the present application also provides a computer readable storage medium having stored therein computer instructions which, when executed on a computer, cause operations and/or processes performed by a terminal device in the method embodiments of the present application to be performed.

The present application also provides a computer readable storage medium having stored therein computer instructions which, when executed on a computer, cause operations and/or processes performed by a source node in various method embodiments of the present application to be performed.

The present application also provides a computer readable storage medium having stored therein computer instructions which, when executed on a computer, cause operations and/or processes performed by an in-vehicle access device in various method embodiments of the present application to be performed.

Furthermore, the present application provides a computer program product comprising computer program code or instructions which, when run on a computer, cause the operations and/or processes performed by the terminal device in the method embodiments of the present application to be performed.

The present application also provides a computer program product comprising computer program code or instructions which, when run on a computer, cause operations and/or processes performed by a source node in method embodiments of the application to be performed.

The present application also provides a computer program product comprising computer program code or instructions which, when run on a computer, cause operations and/or processes performed by an in-vehicle access device in the method embodiments of the present application to be performed.

Furthermore, the present application provides a chip including a processor, where a memory for storing a computer program is provided separately from the chip, and the processor is configured to execute the computer program stored in the memory, so that a communication device in which the chip is installed performs operations and/or processes performed by a terminal device in any one of the method embodiments.

Further, the chip may also include a communication interface. The communication interface may be an input/output interface, an interface circuit, or the like. Further, the chip may further include the memory.

The present application also provides a chip comprising a processor, the memory for storing a computer program being provided independently of the chip, the processor being for executing the computer program stored in the memory, such that a communication device in which the chip is installed performs the operations and/or processes performed by the source node in any of the method embodiments.

The present application also provides a chip including a processor, a memory for storing a computer program being provided independently of the chip, the processor being for executing the computer program stored in the memory, such that a communication device in which the chip is installed performs the operations and/or processes performed by the in-vehicle access device in any one of the method embodiments.

In the alternative, the processor may be one or more, the memory may be one or more, and the memory may be one or more.

The present application further provides a communication device (e.g., may be a chip or a chip system) including a processor and a communication interface for receiving (or referred to as inputting) data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further for outputting (or referred to as outputting) the data and/or information after being processed by the processor, so that operations and/or processing performed by the terminal device in any of the method embodiments are performed.

The present application also provides a communication device (e.g., which may be a chip or a chip system) comprising a processor and a communication interface for receiving (or referred to as inputting) data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further for outputting (or referred to as outputting) the data and/or information after processing by the processor, such that the operations and/or processing performed by the source node in any of the method embodiments is performed.

The present application also provides a communication apparatus (e.g., may be a chip or a chip system) comprising a processor and a communication interface for receiving (or referred to as inputting) data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further for outputting (or referred to as outputting) the data and/or information after processing by the processor, such that the operations and/or processing performed by the in-vehicle access device in any of the method embodiments is performed.

The present application also provides a communication apparatus comprising at least one processor coupled to at least one memory, the at least one processor configured to execute a computer program or instructions stored in the at least one memory, such that the communication apparatus performs operations and/or processes performed by a terminal device in any of the method embodiments.

The present application also provides a communications apparatus comprising at least one processor coupled with at least one memory, the at least one processor configured to execute computer programs or instructions stored in the at least one memory, such that the communications apparatus performs the operations and/or processes performed by the source node in any of the method embodiments.

The present application also provides a communication apparatus comprising at least one processor coupled to at least one memory, the at least one processor configured to execute a computer program or instructions stored in the at least one memory, such that the communication apparatus performs the operations and/or processes performed by the vehicle access device in any of the method embodiments.

In addition, the application also provides a wireless communication system which comprises one or more of the terminal equipment, the source node and the vehicle-mounted access equipment in the embodiment of the method.

The processor in the embodiments of the present application may be an integrated circuit chip having the capability of processing signals. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (digital signal processor, DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in the embodiment of the application can be directly embodied in a hardware encoding processor for execution or in a combination of hardware and software modules in the encoding processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

The methods provided by the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product may include one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media.

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

In order to clearly describe the technical solution of the embodiments of the present application, in the embodiments of the present application, the same items or similar items having substantially the same functions and actions are distinguished by using numbers such as "first", "second", etc. For example, the first event and the second event are merely to distinguish between different events. The first message and the second message are described only for distinguishing between the two messages, and are not limited in their order. Those skilled in the art will appreciate that the numbers "first," "second," etc. are not limited in number and order of execution. And the "first" and "second" are not necessarily different.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. Wherein, A, B and C can be singular or plural, and are not limited.

Further, the character "/" generally indicates that the front-rear association object is an or relationship. "when …" can also be replaced by "in the … case".

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

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

Claims

1. A method of communication, comprising:

the terminal device sends a measurement report of neighbor cell measurement and first information to the vehicle-mounted access node, wherein the first information indicates that the measurement report is sent based on the second event.

2. The method of claim 1, wherein the terminal device determining to generate the second event comprises:

when the terminal equipment is communicated with access equipment of a service cell, the variation or the discrete degree of Reference Signal Receiving Power (RSRP) of the service cell in a period of time is larger than or equal to a first threshold; and/or the number of the groups of groups,

3. The method according to claim 1 or 2, wherein after the terminal device sends the measurement report of neighbor cell measurements and the first information to the in-vehicle access node, the method further comprises:

4. A method according to any of claims 1-3, characterized in that the terminal device is located in the vehicle in which the vehicle-mounted access node is located before the terminal device decides that the second event is generated, and that the mode in which the terminal device performs cell switching is a group switching mode in which the terminal device and other terminal devices accessing the vehicle-mounted access node perform cell switching with the vehicle-mounted access node as one group, neighbor cell measurements and measurement reporting of the cell switching of the group switching mode being performed by the vehicle-mounted access node.

5. The method of claim 4, wherein prior to the terminal device determining that the second event is generated, the method further comprises:

The terminal equipment receives a second message from the vehicle-mounted access node, the second message indicates the terminal equipment to execute the neighbor cell measurement, the second message is sent by the source node under the condition of receiving a third message from the vehicle-mounted access node, the third message indicates the generation of a first event, and the first event is that the vehicle where the vehicle-mounted access node is located is changed from running to parking.

6. A method of communication, comprising:

The first information indicates that the measurement report is sent based on a second event, and the second event is that the terminal equipment and the vehicle-mounted access node move relatively.

7. A method of communication, comprising:

the terminal equipment judges that a second event is generated, wherein the second event is that the terminal equipment and a source node relatively move;

the terminal device sends a measurement report of neighbor cell measurement and first information to the source node, the first information indicating that the measurement report is sent based on the second event.

8. The method of claim 7, wherein the terminal device determining to generate the second event comprises:

9. The method according to claim 7 or 8, wherein after the terminal device sends the measurement report of neighbor cell measurements and the first information to the source node, the method further comprises:

the terminal equipment receives a first message from the source node, the first message indicates the terminal equipment to execute cell switching, the first message comprises information of a target cell, the target cell is managed by a vehicle-mounted access node, and the source node is an access node outside a vehicle where the vehicle-mounted access node is located.

10. The method of claim 9, wherein the method further comprises:

the terminal equipment is switched to the target cell based on the first message;

the terminal equipment receives a fourth message from the vehicle-mounted access node, the fourth message instructs the terminal equipment to stop the measurement of the neighbor cells and changes the mode of cell switching into a group switching mode,

the fourth message is sent by the host node of the vehicle-mounted access node under the condition that a fifth message from the vehicle-mounted access node is received, the fifth message indicates to generate a third event, and the third event is that the vehicle where the vehicle-mounted access node is located is changed from parking to running;

11. A method of communication, comprising:

the first information indicates that the measurement report is sent based on a second event, and the second event is that the terminal equipment and the source node move relatively.

12. A method of communication, comprising:

and the source node executes the switching judgment of the cell switching of the terminal equipment according to the triggering event of the target cell and the measurement report, wherein the target cell is determined by the source node according to the measurement report, the triggering event of the measurement report comprises a second event, and the second event is that the terminal equipment and the source node relatively move.

13. The method of claim 12, wherein the source node is a home node of an in-vehicle access node;

the source node executes the switching decision of the cell switching of the terminal equipment according to the triggering event of the target cell and the measurement report, and the method comprises the following steps:

and in the case that the target cell is not managed by the vehicle-mounted access node and the triggering event of the measurement report is the second event, the source node determines to execute cell switching of the terminal equipment.

14. The method of claim 12, wherein the source node is a node other than a home node of an in-vehicle access node;

under the condition that the target cell is managed by the vehicle-mounted access node, the triggering event of the measurement report is an A3 event or an A5 event, and the source node receives second information from the terminal equipment, the source base station determines to execute cell switching of the terminal equipment, wherein the second information is sent by the terminal equipment when a first timer is overtime, and the first timer is used for assisting the switching judgment; or,

and under the condition that the target cell is managed by the vehicle-mounted access node, the triggering event of the measurement report is an A3 event or an A5 event, and the Reference Signal Received Power (RSRP) of the serving cell of the terminal equipment is lower than a set threshold value, the source base station determines to execute cell switching of the terminal equipment.

15. The method of claim 12, wherein the source node is a node other than a home node of an in-vehicle access node;

The source node determines to execute cell switching of the terminal equipment under the condition that the target cell is managed by the vehicle-mounted access node and the triggering event of the measurement report is the second event; or,

when the target cell is managed by the vehicle-mounted access node, the triggering event of the measurement report is an A3 event or an A5 event, and the Reference Signal Received Power (RSRP) of the serving cell of the terminal equipment is lower than a set threshold value, the source node determines to execute cell switching of the terminal equipment; or,

16. The method of claim 13, wherein the method further comprises:

the source node receives a fifth message from the vehicle-mounted access node, wherein the fifth message indicates generation of a third event, and the third event is that a vehicle in which the vehicle-mounted access node is positioned is changed from stop to running;

The source node sends a fourth message to the terminal equipment in the vehicle where the vehicle-mounted access node is located based on the fifth message, the fourth message instructs the terminal equipment to stop the neighbor cell measurement and changes the cell switching mode into a group switching mode,

the group switching mode is that the terminal equipment and other terminal equipment accessed to the vehicle-mounted access node and the vehicle-mounted access node are used as a group to execute cell switching, and neighbor cell measurement and measurement reporting of the cell switching of the group switching mode are executed by the vehicle-mounted access node.

17. The method according to claim 13 or 16, wherein before the source node receives the measurement report from the terminal device, the method further comprises:

the source node receives a third message from the vehicle-mounted access node, wherein the third message is sent by the vehicle-mounted access node under the condition that the vehicle-mounted access node determines that a first event is generated, and the first event is that the vehicle where the vehicle-mounted access node is located is changed from running to parking;

18. A method of communication, comprising:

the vehicle-mounted access node judges that a first event is generated, wherein the first event is that a vehicle where the vehicle-mounted access node is located is changed from running to parking;

the vehicle-mounted access node receives a second message from the host node, wherein the second message indicates terminal equipment in a vehicle where the vehicle-mounted access node is positioned to execute neighbor cell measurement;

and the vehicle-mounted access node sends the second message to terminal equipment in the vehicle.

19. The method of claim 18, wherein the in-vehicle access node determining to generate the first event comprises:

the in-vehicle access node determines to generate the first event if:

The variation or the discrete degree of the timing advance TA indicated by the access equipment of the service cell of the vehicle-mounted access node in a period of time is larger than or equal to a sixth threshold.

20. The method of claim 18 or 19, wherein the method further comprises:

the vehicle-mounted access node sends a fifth message to the host node, wherein the fifth message indicates that the third event is generated;

the vehicle-mounted access node receives a fourth message from the host node, the fourth message indicates a terminal device in a vehicle where the vehicle-mounted access node is positioned to stop the measurement of the neighbor cell and change the cell switching mode into a group switching mode,

21. The method of claim 20, wherein the in-vehicle access node determining to generate the third event comprises:

The in-vehicle access node determines that the third event is generated, if:

the variation or the discrete degree of the timing advance TA indicated by the access equipment of the service cell of the vehicle-mounted access node in a period of time is larger than or equal to a ninth threshold.

22. The method of any one of claims 18-21, wherein the method further comprises:

and the vehicle-mounted access node sends the measurement report to the host node.

23. The method of any one of claims 18-21, wherein the method further comprises:

the vehicle-mounted access node receives a measurement report and first information of the neighbor cell measurement from first terminal equipment, wherein the first information indicates that the measurement report is sent based on a second event, and the second event is that the first terminal equipment and a source node relatively move;

the vehicle-mounted access node sends the measurement report and the first information to the host node.

24. A communication device comprising means having the functionality to implement the method of any one of claims 1-11, or the method of any one of claims 12-17, or the method of any one of claims 18-23.

25. A communication device comprising at least one processor coupled to at least one memory, the at least one processor configured to execute a computer program or instructions stored in the at least one memory to cause the communication device to perform the method of any one of claims 1-11, or the method of any one of claims 12-17, or the method of any one of claims 18-23.

26. A chip comprising a processor and a communication interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information to perform the method of any one of claims 1-11, or the method of any one of claims 12-17, or the method of any one of claims 18-23.

27. A computer readable storage medium, having stored therein a computer program or instructions which, when run on a computer, causes the method according to any one of claims 1-11, or the method according to any one of claims 12-17, or the method according to any one of claims 18-23 to be implemented.