WO2022087822A1

WO2022087822A1 - Mapping table construction method and apparatus, storage medium, and mobile device handover method

Info

Publication number: WO2022087822A1
Application number: PCT/CN2020/123984
Authority: WO
Inventors: 谭爽; 马万里; 蓝培; 王力; 张洁
Original assignee: 西门子股份公司; 西门子（中国）有限公司
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2022-05-05

Abstract

The present disclosure relates to a mapping table construction method and apparatus, a storage medium, and a mobile device handover method. A mapping table is used to represent a correspondence relationship between the position of a mobile device and a wireless communication quality at the position. The mapping table construction method comprises: dividing a predetermined movement range of a mobile device into a plurality of grids of a predetermined size; and constructing a mapping table that represents a wireless communication network communication quality at each grid, wherein each unit in the mapping table corresponds to one of the grids, and the unit records a network metric of the wireless communication network communication quality of the mobile device at the grid.

Description

Mapping table construction method, apparatus, storage medium and mobile device switching method

technical field

The present disclosure generally relates to the field of digital technology, and more particularly, to a mapping table construction method, apparatus, storage medium, and mobile device switching method.

Background technique

For mobile communication, different mobile networks are usually deployed in indoor and outdoor scenarios. For example, outdoor mobile networks may have lower carrier frequencies, higher coverage, and serve more users. On the other hand, indoor mobile networks may operate at higher carrier frequencies with limited coverage and higher speeds. These networks can even be operated by different operators. For industrial scenarios, it may be similar that indoor studio areas are served by WLAN or private 4G/5G, while outdoor areas are served by public 4G/5G networks.

To maintain a seamless wireless connection when an automated guided vehicle (AGV) or robot moves between indoor and outdoor areas, mobile communication services need to switch from one network to another. However, during the handover process, the wireless communication may be interrupted for some time, which leads to a large delay, and even the handover fails.

Handover decision is the ability to decide when to handover. The handover can be performed by the mobile host (mobile-controlled handover), by the network (network-controlled handover), or by cooperation between the two (mobile-assisted handover). However, handovers between different access points belonging to different networks are often more challenging because handover decisions involve not only when to handover but also whether to handover. The decision to hand over between networks may depend on several issues related to the network to which the mobile device is already connected and the network to which the mobile device is to be handed over. For example, the decision to perform a mobility control handover may be made by a handover agent placed on the mobile device based on policies such as network bandwidth, load, coverage, cost, security, quality of service, or even user preference.

Existing handover methods are based only on instant information from a particular mobile device. This approach is reasonable when the decision is made only for the individual mobile terminal. However, due to the rapidly changing environment over time and the limited capacity of the device, short-term measurements for a given device may be inaccurate, and this inaccuracy may cause erroneous handover moments, thus adversely affecting wireless communication performance .

SUMMARY OF THE INVENTION

The following presents a brief summary of the present invention in order to provide a basic understanding of certain aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or essential parts of the invention nor to limit the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

In view of this, the present invention proposes a solution that can provide seamless and more reliable handover between different wireless communication networks for industrial automation scenarios.

According to one aspect of the present disclosure, a method for constructing a mapping table is provided, wherein the mapping table is used to represent the correspondence between the location of a mobile device and the wireless communication quality at the location, including: dividing a predetermined range of movement of the mobile device into a plurality of grids of predetermined sizes; and constructing a mapping table representing the communication quality of the wireless communication network at each grid, wherein each cell in the mapping table corresponds to one of the grids, and in the cells A network metric of the communication quality of the wireless communication network of the mobile device at the grid is recorded.

In this way, a mapping table is constructed, the mapping table can represent the correspondence between the location of the mobile device and the communication quality of different wireless communication networks at the location, and the mobile device can refer to the mapping table to know the difference at its location. The communication quality of the wireless communication network, so as to intelligently make the decision of whether to perform inter-network handover.

Optionally, in an example of the above aspect, the network metric value is calculated by the mobile device according to a parameter related to communication quality at the grid.

Optionally, the parameters related to the communication quality include at least one of the following: data rate, delay, signal-to-noise ratio, and received signal strength.

Optionally, in an example of the above aspect, the wireless communication network includes WLAN, 4G and 5G, and the unit records a network metric value of each of the wireless communication networks.

Optionally, in an example of the above aspect, the method further includes: updating the mapping table based on the historical network metric value recorded in the mapping table and the current network metric value calculated by the mobile device.

Optionally, in an example of the above aspect, the current network metric value is calculated by the mobile device when moving to a new grid or is calculated periodically.

Optionally, in an example of the above aspect, the method further includes: for a grid without recorded network metric values, using an interpolation method to calculate the grid metric value based on the network metric values of adjacent grids of the grid. Network metrics.

According to another aspect of the present disclosure, there is provided an apparatus for constructing a mapping table, wherein the mapping table is used to represent the correspondence between the position of the mobile device and the wireless communication quality at the position, comprising: a grid dividing unit configured to A predetermined range of device movement is divided into a plurality of grids of predetermined sizes; and a mapping table construction unit configured to construct a mapping table representing the communication quality of the wireless communication network at each grid, wherein the Each cell corresponds to one of the grids in which the network metrics of the communication quality of the wireless communication network of the mobile device at the grid are recorded.

According to another aspect of the present disclosure, a mobile device switching method is provided, comprising: a mobile device downloading a mapping table constructed according to the above method from a server or the server periodically broadcasting the mapping table to all mobile devices; and the mobile device is based on the A mapping table and a predetermined switching strategy are used to determine whether to switch the wireless communication network.

Optionally, in an example of the above aspect, the predetermined handover strategy includes at least one of the following:

The mobile device compares the network metric values of the multiple wireless communication networks recorded in the mapping table corresponding to the grid where it is currently located, and if the wireless communication network to which the mobile device is currently connected has the best network metric value, then Do not switch, otherwise switch to the wireless communication network with the best network metric value;

The mobile device sets a preferred network and a handover threshold, and when the wireless communication network to which the mobile device is currently connected is the preferred network, network handover is performed only when the network metric value of the current wireless communication network is lower than the handover threshold;

The mobile device predicts future handovers based on its predetermined movement path and the network metric values of the respective meshes on the predetermined movement path, if it is predicted that the mobile device will switch back within a predetermined time after switching to another wireless communication network the current wireless communication network, the mobile device decides to remain connected to the current wireless communication network without switching; and

When the mobile device observes that the network metric values of all wireless communication networks that it can connect to at a specific location are lower than the predetermined network metric value, the mobile device requests multiple network connections from the server.

According to another aspect of the present disclosure, there is provided a computing device comprising: at least one processor; and a memory coupled to the at least one processor, the memory for storing instructions, when the instructions are executed by the at least one processor When executed by the processor, the processor is caused to execute the method as described above.

According to another aspect of the present disclosure, there is provided a non-transitory machine-readable storage medium storing executable instructions that, when executed, cause the machine to perform the method as described above.

According to another aspect of the present disclosure, there is provided a computer program comprising computer-executable instructions which, when executed, cause at least one processor to perform the method as described above.

According to another aspect of the present disclosure, there is provided a computer program product tangibly stored on a computer-readable medium and comprising computer-executable instructions that, when executed, cause at least one A processor executes the method as described above.

According to the mapping table construction method and the mobile device handover method of the present disclosure, by referring to the information in the mapping table, the decision whether to perform handover or whether to perform handover can be significantly improved, thereby improving wireless communication performance, especially for For those mobile terminals with limited measurement capabilities and power capabilities. At the same time, with the help of other mobile devices, for AGVs or mobile robots, possible future handovers can be predicted, so that the ping-pong effect caused by unnecessary handovers can be avoided, which can save network resources and further improve wireless communication performance, This is not possible with existing solutions.

Description of drawings

The above and other objects, features and advantages of the present invention will be more easily understood with reference to the following description of the embodiments of the present invention in conjunction with the accompanying drawings. The components in the drawings are merely intended to illustrate the principles of the invention. In the drawings, the same or similar technical features or components will be denoted by the same or similar reference numerals. In the attached picture:

1 is a flowchart of an exemplary process of a mapping table construction method according to an embodiment of the present disclosure;

2 is a block diagram of an exemplary configuration of a mapping table construction apparatus according to an embodiment of the present disclosure;

Figure 3 shows a schematic diagram of communication between four mobile devices and a server in a factory;

4 is a flowchart of an exemplary process of a mobile device handover method according to an embodiment of the present disclosure; and

5 shows a block diagram of a computing device for constructing a mapping table according to an embodiment of the present disclosure.

Among them, the reference numerals are as follows:

100: Mapping table construction method S102, S104, S106, S108: steps

200: Mapping table construction device 202: Meshing unit

204: Mapping table construction unit 206: Mapping table update unit

208:

Interpolation unit

301, 302, 303 and 304: Mobile devices

305: Server 400: Mobile device switching method

S402, S404: Step 500: Computing equipment

502: Processor 504: Memory

Detailed ways

The subject matter described herein will now be discussed with reference to example implementations. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and not to limit the scope of protection, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as desired. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with respect to some examples may also be combined in other examples.

As used herein, the term "including" and variations thereof represent open-ended terms meaning "including but not limited to". The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment." The term "another embodiment" means "at least one other embodiment." The terms "first", "second", etc. may refer to different or the same objects. Other definitions, whether explicit or implicit, may be included below. The definition of a term is consistent throughout the specification unless the context clearly dictates otherwise.

In order to solve the above problems, the present invention proposes a solution that can provide seamless and more reliable handover between different wireless communication networks for industrial automation scenarios. If the indoor and outdoor mobile devices use the same communication technology, are in the same frequency spectrum and are provided by the same operator, the handover is a traditional intra-network handover, which is beyond the scope of the present invention.

In the solution of the present disclosure, a mapping table is first constructed, the mapping table can represent the correspondence between the location of the mobile device and the communication quality of different wireless communication networks at the location, and the mobile device can refer to the mapping table to know the Communication quality of different wireless communication networks at different locations, so as to intelligently make decisions whether to perform inter-network handover.

The mapping table construction method and the mobile device switching method according to the embodiments of the present disclosure will be described below with reference to the accompanying drawings.

FIG. 1 is a flowchart of an exemplary process of a mapping table construction method 100 according to an embodiment of the present invention.

In FIG. 1 , firstly in step S102 , the predetermined range in which the mobile device moves is divided into a plurality of grids of predetermined size.

The predetermined range in which the mobile device moves is, for example, the entire factory where the mobile device works, which can include indoor and outdoor areas. The size of a grid divided is predetermined, such as 50cm*50cm, and one grid corresponds to a physical location of the factory .

The mobile device may be, for example, an AGV (Automated Guided Vehicle) or a mobile robot, and the present invention does not limit the type of the mobile device.

Next, in step S104, a map representing the communication quality of the wireless communication network at each mesh is constructed.

Mobile devices at each grid may receive signals from various wireless communication networks, which may include, for example, WLAN, 4G, 5G, and the like.

In the mapping table, each unit corresponds to a grid, and each unit records network metric values of the communication quality of each wireless communication network of the mobile device at the grid.

Specifically, the mapping table may be in a 2-dimensional table form, each unit corresponds to a grid, and an array is used in one unit to record the network metric values of the communication quality of all wireless communication networks at the grid; also A 2-dimensional mapping table can be maintained for each wireless communication network, and in each mapping table, a unit records the network metric value of the communication quality of the current wireless communication network at the grid; the mapping table can also be a 3-dimensional mapping table. A tabular form of dimension that records network metrics of communication quality at each grid for all wireless communication networks.

The present invention does not limit the specific form of the mapping table, as long as the mapping table can represent the communication quality of each wireless communication network at each grid.

In the method of the present invention, a network metric is used to represent the communication quality of a wireless communication network at a given grid. The network metric is calculated by the mobile device based on parameters related to communication quality at a grid. Specifically, the parameters may include data rate, transmission delay, signal-to-noise ratio, received signal strength and other parameters at the grid, and a weighted combination of these parameters.

In the method of the present invention, the specific types of parameters related to communication quality and the algorithm used for calculating the network metric value are not limited. Those skilled in the art can select appropriate parameters, weights of parameters and algorithms to calculate The network metric value will not be described in detail here.

For a system with multiple wireless communication networks based on the same or different connection technologies, a connection management layer (Connectivity Management Layer, CML) can usually be set between the application and the mobile communication system. The function of the connection management layer is to decide which wireless communication network a mobile device should use. The mapping table constructed above can be stored, for example, on a server located in the connection management layer, to help the mobile device make intelligent decisions.

The mapping table can be an empty table initially, and the network metric value recorded in each unit is moved by the mobile device to a certain position in a predetermined range (in the present invention, it is a grid unit), according to each A parameter related to the communication quality of a wireless communication network is used to calculate the network metric value of each wireless communication network, and then the mobile device reports the grid where it is located and the calculated network metric value to the server, and the server reports each network metric value. Recorded in the corresponding cell of the mapping table. Multiple mobile devices move to different grids, and then report the network metrics at each grid to the server to gradually populate the mapping table. In addition, it is also possible to use a plurality of mobile devices for special training in the test phase, and to calculate the network metric values of each wireless communication network at each grid, so as to obtain an initial mapping table.

No matter how the mapping table is constructed, the mapping table can be continuously updated. In one example, the mapping table construction method 100 further includes step S106 of updating the mapping table based on the historical network metric value recorded in the mapping table and the current network metric value calculated by the mobile device. It can be understood that the historical network metric value and the current network metric value mentioned here are for the network metric value at the same grid.

Specifically, when the mobile device moves to a new grid or periodically at one grid, the network metric value of the wireless communication network around it is calculated, and the network metric value is reported to the server. The server calculates a new network metric value according to the historical network metric value of the grid stored in the mapping table and the newly reported current network metric value, and records the new network metric value in the cell corresponding to the grid in the mapping table to update the mapping table.

When calculating the new network metric value, the recording time of the historical network metric value can be considered, and different weights can be assigned to the historical network metric value and the current network metric value to calculate the new network metric value. For example, historical network metrics that have not been updated in a long time may be assigned a small weight. This can not only reduce the error of the current network metric value that may be caused by accident, but also avoid the possible inaccuracy of the older historical metric value.

For some grids that have not recorded network metric values, such as in the corner of the factory, where the mobile devices go to less places, the method 100 may further include step S108. For grids without recorded network metric values, based on the grid The network metric value of the adjacent grid is determined by interpolation method to determine the network metric value of the grid. Those skilled in the art can select an appropriate number of grids around the grid or in a certain direction according to specific conditions, and use the network metric values of these grids to determine the network metric value to be determined.

The mapping table constructed in this way can give the overall situation of the statistical coverage of each mobile network. Since the information obtained is based on all mobile devices, which are distributed in different locations and have different measurement capabilities and power levels, it is possible to update the communication quality representing the wireless communication network more frequently and more accurately than a single mobile device It can help mobile devices to intelligently make decisions about whether to perform network handover.

FIG. 2 is a block diagram of an exemplary configuration of a mapping table construction apparatus 200 according to an embodiment of the present invention. In FIG. 2 , the mapping table construction apparatus 200 includes a grid dividing unit 202 and a mapping table construction unit 204 .

The grid dividing unit 202 is configured to divide a predetermined range of movement of the mobile device into a plurality of grids of predetermined sizes.

The mapping table construction unit 204 is configured to construct a mapping table representing the communication quality of the wireless communication network at each mesh, wherein each cell in the mapping table corresponds to one of the meshes, and the cell records A network metric of the communication quality of the wireless communication network of the mobile device at the grid.

Wherein, the network metric is calculated by the mobile device based on parameters related to communication quality at the grid.

The parameters related to the communication quality include at least one of the following: data rate, delay, signal-to-noise ratio, and received signal strength.

Wherein, the wireless communication network includes WLAN, 4G and 5G, and the unit records the network metric value of each of the wireless communication networks.

The mapping table construction apparatus 200 may further include: a mapping table updating unit 206, configured to update the mapping table based on the historical network metric value recorded in the mapping table and the current network metric value calculated by the mobile device.

Wherein, the current network metric value is calculated by the mobile device when moving to a new grid or is calculated periodically.

Wherein, the mapping table construction apparatus 200 may further include: an interpolation unit 208, configured to, for a grid without a recorded network metric value, use an interpolation method to calculate the network metric value of the grid adjacent to the grid. Network metrics.

The details of operations and functions of various parts of the mapping table construction apparatus 200 may be the same as or similar to the relevant parts of the embodiment of the mapping table construction method of the present disclosure described with reference to FIG. 1 , and will not be described in detail here.

It should be noted that the structures of the mapping table constructing apparatus 200 and its constituent units shown in FIG. 2 are merely exemplary, and those skilled in the art can modify the structural block diagram shown in FIG. 2 as required.

The mobile device handover method according to an embodiment of the present disclosure will be described below with reference to FIGS. 3-4 .

Figure 3 shows four

mobile devices

301, 302, 303, and 304 (eg, AGVs or mobile robots) in a factory, which can report their respective status information to a server 305, such as network metrics for their locations where they are calculated The value is reported to the server 305 , the server 305 stores the mapping table constructed according to the above method, and the mobile device can download the mapping table from the server 305 . As mentioned above, the server 305 may be provided at the connection management layer between the application and the mobile network.

FIG. 4 is a flowchart of an exemplary process of a mobile device switching method 400 according to an embodiment of the present disclosure, and the specific operation of the mobile device performing network switching will be described below with reference to FIG. 4 .

In FIG. 4, first, in step S402, the mobile device downloads the mapping table constructed according to the above method from the server or the server periodically broadcasts the mapping table to all mobile devices.

That is to say, the mobile device can actively download the latest mapping table from the server when it needs to obtain the latest mapping table, and can also receive it through the broadcast of the server.

In step S404, the mobile device determines whether to switch the wireless communication network based on the mapping table and a predetermined switching strategy.

The mapping table records network metric values of different wireless communication networks in each grid, and the mobile device can know the communication quality of different wireless communication networks in a certain grid based on the mapping table.

The mobile device can determine whether to switch the wireless communication network according to the communication quality of the different communication networks and the predetermined switching strategy.

Specifically, the predetermined handover strategy may include:

1. The mobile device compares the network metric values of the multiple wireless communication networks recorded in the mapping table corresponding to the grid where it is currently located, and if the wireless communication network to which the mobile device is currently connected has the best network metric value , then do not switch, otherwise switch to the wireless communication network with the best metric value. This handover strategy is to find the wireless communication network with the best communication quality.

2. The mobile device sets a preferred network and a handover threshold. When the wireless communication network the mobile device is currently connected to is the preferred network, network handover is performed only when the network metric value of the current wireless communication network is lower than the handover threshold. . This handover strategy is that the mobile device has its preferred network, for example, WLAN is preferred. When already connected to WLAN, only when the communication quality of WLAN is poor, that is, the network metric value of WLAN is lower than the preset handover threshold. When the network switch is performed. Simply put, try to use the user's preferred wireless communication network.

3. The mobile device predicts the handover that will occur in the future according to its predetermined moving path and the network metric values of each grid on the predetermined moving path. If it is predicted that the mobile device will be handed over to another wireless communication network within a predetermined time Switching back to the current wireless communication network, the mobile device decides to remain connected to the current wireless communication network without switching. This strategy is that if it is predicted that the network may be switched back soon after the network switch is performed, the switch will not be performed, which can avoid a ping-pong effect and waste resources.

4. When the mobile device observes that the network metric values of all wireless communication networks that it can connect to at a specific location are lower than the predetermined network metric value, the mobile device requests multiple network connections from the server. That is, the mobile device connects to another network without disconnecting from the current network.

The mobile device can select an appropriate handover strategy according to the application's requirements for wireless network communication quality. Those skilled in the art can understand that other handover strategies can also be used in the handover method according to the present disclosure, and are not limited to the above.

It can be understood that during the movement of the mobile device, its location and network measurements calculated according to parameters related to communication quality can be reported to the server periodically or as required, so that the server can update the mapping table. What to report and how to report can be pre-determined or configured by the server, and can also be configured differently for each mobile device, which will not be described in detail here.

Existing handover methods only consider the state of a single mobile device, which is very susceptible to uncertainties due to the small number of measurement samples and the environment. The solution proposed by the present invention involves a large number of mobile devices, which can share information with each other to build a mapping table. By referring to the information in the mapping table, decisions about when to handoff or whether to handoff can be significantly improved, thereby improving wireless communication performance, especially for those mobile terminals with limited measurement and power capabilities. At the same time, with the help of other mobile devices, for AGVs or mobile robots, possible future handovers can be predicted, so that the ping-pong effect caused by unnecessary handovers can be avoided, which can save network resources and further improve wireless communication performance, This is not possible with existing solutions.

As above, with reference to FIGS. 1 to 4 , the mapping table construction method and apparatus and the mobile device switching according to the embodiments of the present disclosure are described. Each unit of the above-mentioned mapping table construction apparatus may be implemented by hardware, or may be implemented by software or a combination of hardware and software.

5 shows a block diagram of a computing device 500 for constructing a mapping table according to an embodiment of the present disclosure. According to one embodiment, computing device 500 may include at least one processor 502 that executes at least one computer-readable instruction (ie, the above-described in software form) stored or encoded in a computer-readable storage medium (ie, memory 504 ). implemented elements).

It should be understood that the computer-executable instructions stored in memory 504, when executed, cause at least one processor 502 to perform various operations and functions described above in connection with FIGS. 1-2 in various embodiments of the present disclosure.

According to one embodiment, a non-transitory machine-readable medium is provided. The non-transitory machine-readable medium may have machine-executable instructions (ie, the above-described elements implemented in software) that, when executed by a machine, cause the machine to perform various embodiments of the present disclosure above in conjunction with FIGS. 1-2 Various operations and functions are described.

According to one embodiment, there is provided a computer program comprising computer-executable instructions that, when executed, cause at least one processor to perform each of the various embodiments of the present disclosure described above in connection with FIGS. 1-3 . operations and functions.

According to one embodiment, there is provided a computer program product comprising computer-executable instructions that, when executed, cause at least one processor to perform the various embodiments of the present disclosure described above in connection with FIGS. 1-2 Various operations and functions.

It should be understood that, the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the description of other embodiments. the difference. For example, for the above-mentioned embodiments about the apparatus, the embodiment about the computing device, and the embodiment about the machine-readable storage medium, since they are basically similar to the method embodiments, the descriptions are relatively simple, and the relevant details refer to the method implementation Part of the example can be explained.

Specific embodiments of the present specification have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Not all steps and units in the above processes and system structure diagrams are necessary, and some steps or units may be omitted according to actual needs. The device structure described in the above embodiments may be a physical structure or a logical structure, that is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities respectively, or may be implemented by multiple physical entities. Some components in separate devices are implemented together.

The detailed description set forth above in connection with the accompanying drawings describes exemplary embodiments and does not represent all embodiments that may be implemented or fall within the scope of the claims. The term "exemplary" as used throughout this specification means "serving as an example, instance, or illustration" and does not mean "preferred" or "advantage" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described embodiments.

The above description of the present disclosure is provided to enable any person of ordinary skill in the art to make or use the present disclosure. Various modifications to this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of this disclosure . Thus, the present disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims

A method for constructing a mapping table, wherein the mapping table is used to represent the correspondence between the position of the mobile device and the wireless communication quality at the position, including:

dividing the predetermined range of movement of the mobile device into a plurality of grids of predetermined size; and

constructing a mapping table representing the communication quality of the wireless communication network at each grid, wherein each cell in the mapping table corresponds to one of the grids in which the mobile device is recorded in the grid A network metric of the communication quality of a wireless communication network at .
The method of claim 1, wherein the network metric is calculated by the mobile device from parameters related to communication quality at the grid.
The method of claim 2, wherein the parameters related to communication quality include at least one of the following: data rate, delay, signal-to-noise ratio, received signal strength.
The method of any one of claims 1-3, wherein the wireless communication networks include WLAN, 4G, and 5G, and the unit records network metrics for each of the wireless communication networks.
The method of any one of claims 1-3, further comprising: updating the mapping table based on historical network metric values recorded in the mapping table and current network metric values calculated by the mobile device.
6. The method of claim 5, wherein the current network metric is calculated by the mobile device when moving to a new grid or periodically.
The method according to any one of claims 1-3, further comprising: for a grid for which no network metric value is recorded, using an interpolation method to calculate the grid metric value based on the network metric values of adjacent grids of the grid Network metrics.
A mapping table construction device, the mapping table is used to represent the correspondence between the position of the mobile device and the wireless communication quality at the position, including:

a meshing unit configured to divide a predetermined range of movement of the mobile device into a plurality of meshes of predetermined size; and

a mapping table construction unit configured to construct a mapping table representing the communication quality of the wireless communication network at each grid, wherein each element in the mapping table corresponds to one of the grids, and records in the unit A network metric of the communication quality of the wireless communication network of the mobile device at the grid.
9. The apparatus of claim 8, wherein the network metric is calculated by the mobile device from parameters related to communication quality at the grid.
9. The apparatus of claim 9, wherein the parameter related to communication quality includes at least one of the following: data rate, delay, signal-to-noise ratio, received signal strength.
The apparatus of any one of claims 8-10, wherein the wireless communication networks include WLAN, 4G and 5G, and the unit records a network metric value of each of the wireless communication networks.
The apparatus according to any one of claims 8-10, further comprising: a mapping table updating unit configured to be based on the historical network metric value recorded in the mapping table and the current network metric value calculated by the mobile device, to update the mapping table.
13. The apparatus of claim 12, wherein the current network metric is calculated by the mobile device when moving to a new grid or periodically.
The apparatus according to any one of claims 8-10, further comprising: an interpolation unit configured to, for a grid without recorded network metric values, adopt an interpolation method based on network metric values of adjacent grids of the grid to calculate the network metrics for this grid.
Mobile device switching methods, including:

The mobile device downloads the mapping table constructed according to the method of claims 1-7 from the server or the server periodically broadcasts the mapping table to all mobile devices; and

The mobile device determines whether to switch wireless communication networks based on the mapping table and a predetermined switching strategy.
The method of claim 15, wherein the predetermined handover strategy includes at least one of the following:

The mobile device compares the network metric values of the multiple wireless communication networks recorded in the mapping table corresponding to the grid where it is currently located, and if the wireless communication network to which the mobile device is currently connected has the best network metric value, then Do not switch, otherwise switch to the wireless communication network with the best network metric value;

The mobile device sets a preferred network and a handover threshold, and when the wireless communication network to which the mobile device is currently connected is the preferred network, network handover is performed only when the network metric value of the current wireless communication network is lower than the handover threshold;

The mobile device predicts future handovers based on its predetermined travel path and the network metric values of the respective meshes on the predetermined travel path, if it is predicted that the mobile device will switch back within a predetermined time after switching to another wireless communication network the current wireless communication network, the mobile device decides to remain connected to the current wireless communication network without switching; and

When the mobile device observes that the network metric values of all wireless communication networks it can connect to at a specific location are lower than the predetermined network metric value, the mobile device requests multiple network connections from the server.
A computing device (400) comprising:

at least one processor (602); and

a memory (604) coupled to the at least one processor (602) for storing instructions that, when executed by the at least one processor (602), cause the processor (602) ) to perform a method as claimed in any one of claims 1 to 7.
A non-transitory machine-readable storage medium storing executable instructions which, when executed, cause the machine to perform the method of any one of claims 1 to 7.
A computer program comprising computer-executable instructions which, when executed, cause at least one processor to perform the method of any one of claims 1 to 7.
A computer program product tangibly stored on a computer-readable medium and comprising computer-executable instructions which, when executed, cause at least one processor to perform the functions according to claims 1 to 7 any of the methods described in .