CN115396969A - Method and device for realizing seamless switching between devices through WIFI signal strength - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a method and a device for realizing seamless switching between devices through WIFI signal strength, wherein STA signal strength is tracked through an associated AP and an adjacent AP, the movement trend of the STA relative to the associated AP is calculated, candidate APs which are relatively close to the STA are predicted, then an optimal candidate AP is selected as a next switching target AP according to the STA signal strength tracked by each candidate AP, and when the STA signal of the current associated AP is lower than a threshold value or less than the STA signal of the optimal candidate AP, the connection between the STA and the current associated AP is actively cut off, so that the STA and the AP can be rapidly switched in a short time, and the switching delay is reduced.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a device for realizing seamless switching between devices through WIFI signal strength.
Background
In the WLAN, an ESS (Extended Service Set) Service is provided. In the same ESS coverage area, a terminal device (SAT) can be associated with different wireless Access points (Access points/APs), obtain network services through a WLAN, and can be seamlessly switched among different APs, namely seamlessly roaming.
In an extended service set, when a terminal device (SAT) moves from one wireless Access Point (AP) coverage area to another, the terminal device (SAT) needs to re-associate with the new wireless Access Point (AP). When the terminal equipment (SAT) moves away from the current wireless Access Point (AP), the received signal strength (usually represented by RSSI value) from the current wireless Access Point (AP) will become lower gradually, and if the RSSI value is lower than a certain threshold value, the terminal equipment (SAT) will start to search for an access point with better signal strength for re-association, thereby triggering the handover process.
Currently, the switching strategy and behavior depend on the terminal equipment (SAT), but with the rapid development of the 5G technology, the requirement of the user for seamless switching of wireless roaming is higher, and the existing switching strategy based on the terminal equipment (SAT) is more difficult to meet the requirement of the user for the delay of switching the terminal equipment (SAT) between two wireless Access Points (APs).
Disclosure of Invention
In view of the foregoing problems, an object of the present invention is to provide a method and an apparatus for implementing seamless handover between devices through WIFI signal strength, so as to implement seamless handover between different APs of an STA.
In a first aspect, the present invention provides a method for implementing seamless handover between devices through WIFI signal strength, including the following steps:
receiving report information sent by an associated AP and a non-associated AP, wherein the report information comprises STA signal strength;
calculating the movement trend of the STA relative to the associated AP in one or more STA scanning periods according to the STA signal strength reported by the associated AP and the non-associated AP, and predicting candidate APs which are relatively close to the STA;
selecting an optimal candidate AP as a next switching target AP according to the STA signal intensity tracked by each candidate AP;
and when the STA signal of the current associated AP is lower than a threshold value or less than the STA signal of the optimal candidate AP, actively cutting off the connection between the current associated AP and the STA so that the STA is re-associated to the optimal candidate AP.
In an embodiment of the present invention, the report information further includes AP location information and/or an AP identifier, and after receiving the report information sent by the associated AP and the non-associated AP, the AP adjacent to the associated AP is found from the AP neighbor information table as the non-associated AP according to the AP location information and/or the AP identifier of the associated AP.
In another embodiment of the present invention, the report information further includes AP location information and/or AP identification, and after receiving the report information sent by the associated AP and the non-associated AP, the neighbor APs adjacent to the associated AP are found from the non-associated AP according to the AP location information and/or AP identification of the associated AP.
In one embodiment of the present invention, calculating the movement trend of the STA relative to the associated AP in one or more STA scanning periods comprises the following steps:
establishing a STA signal strength set R, R = { (R) of an associated AP and a non-associated AP in one or more STA scanning periods i 1，r i 2，…，r i n），（r i+1 1，r i+1 2，…，r i+2 n），（r i+2 1，r i+2 2，…，r i+2 n），…（r i+m 1，r i+m 2，…，r i+m n) }; where n denotes the number of scans in one or more STA scanning periods, r i x represents STA signal strength reported by associated AP during the x-th scanning of STA, r i+1 y、r i+2 、……、r i+m y represents the STA signal strength reported by the non-associated AP when the STA scans for the y time;
calculating a linear regression equation corresponding to the STA signal strength reported by the associated AP and the non-associated AP according to the set R to obtain a slope set K, K = { K } of the associated AP and the non-associated AP i 、k i+1 、k i+2 、……、k i+m }；
And determining the movement trend of the STA relative to the associated AP according to the slope set K.
In an embodiment of the present invention, in the linear regression equation corresponding to the STA signal strength reported by the associated AP and the non-associated AP calculated according to the set R, a least square method is used to determine the linear regression equation.
In an embodiment of the present invention, the determining a movement trend of the STA relative to the associated AP according to the slope set K includes:
sorting the values in the slope set K from large to small, extracting values with the values being more than or equal to 0 to form a set K ', extracting values with the values being less than 0 to form a set K' ', wherein the corresponding AP in the set K' represents an AP relatively close to the STA, and the corresponding AP in the set K '' represents an AP relatively far away from the STA;
in an embodiment of the present invention, the predicting the candidate APs that are relatively close to the STA includes: and taking the AP corresponding to the maximum three values from the set K' as the candidate AP.
In one embodiment of the invention.
In a second aspect, the present invention further provides an apparatus for implementing seamless handover between devices through WIFI signal strength, including:
the receiving module is used for receiving report information sent by an associated AP and a non-associated AP, wherein the report information comprises STA signal strength;
the calculation module is used for calculating the movement trend of the STA relative to the associated AP in one or more STA scanning periods according to the STA signal strength reported by the associated AP and the non-associated AP and predicting candidate APs close to the STA;
the switching module selects the optimal candidate AP as the next switching target AP according to the STA signal intensity tracked by each candidate AP;
and when the STA signal of the current associated AP is lower than the threshold value or less than the STA signal of the optimal candidate AP, actively cutting off the connection between the current associated AP and the STA, so that the STA is re-associated to the optimal candidate AP.
In an embodiment of the present invention, the report information further includes AP location information and/or an AP identifier, and after the receiving module receives the report information sent by the associated AP and the non-associated AP, the receiving module finds out an AP adjacent to the associated AP from the AP neighbor information table as the non-associated AP according to the AP location information and/or the AP identifier of the associated AP.
In an embodiment of the present invention, the calculating module calculates a movement trend of the STA relative to the associated AP in one or more STA scanning periods, including the following steps:
establishing a STA signal strength set R, R = { (R) of an associated AP and a non-associated AP in one or more STA scanning periods i 1，r i 2，…，r i n），（r i+1 1，r i+1 2，…，r i+2 n），（r i+2 1，r i+2 2，…，r i+2 n），…（r i+m 1，r i+m 2，…，r i+m n) }; where n denotes the number of scans in one or more STA scanning periods, r i x represents STA signal strength reported by associated AP during the x-th scanning of STA, r i+1 y、r i+2 、……、r i+m y represents the STA signal strength reported by the non-associated AP when the STA scans for the y time;
calculating a linear regression equation corresponding to the STA signal strength reported by the associated AP and the non-associated AP according to the set R to obtain a slope set K, K = { K } of the associated AP and the non-associated AP i 、k i+1 、k i+2 、……、k i+m }；
And determining the movement trend of the STA relative to the associated AP according to the slope set K.
In a third aspect, the present invention also provides an electronic device, including:
a processor; and
a memory for storing a computer program for the processor;
wherein the processor is configured to implement any one of the possible methods of the first aspect by executing the computer program.
In a fourth aspect, the present application further provides a computer program product comprising a computer program which, when executed by a processor, implements the method of any one of the third and/or fourth aspects.
In a fifth aspect, the invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program of instructions for implementing any one of the possible methods of the first aspect when executed by a processor.
The invention has the beneficial effects that:
the method adopts the associated AP as a center, tracks the STA signal intensity through the associated AP and the adjacent AP, calculates the movement trend of the STA relative to the associated AP, predicts candidate APs which are relatively close to the STA, selects the optimal candidate AP as the next switching target AP according to the STA signal intensity tracked by each candidate AP, and actively cuts off the connection between the STA and the current associated AP when the STA signal of the current associated AP is lower than a threshold value or less than the STA signal of the optimal candidate AP, so that the STA and the AP can be quickly switched in a short time, and the switching delay is reduced.
Drawings
Fig. 1 is a schematic flow chart according to an embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
The method and the device provided by the invention are applied to an Access Controller (AC) or a server, the AC or the server can associate STA signal strength reported by an AP and an adjacent AP, calculate the movement trend of the STA relative to the associated AP, predict candidate APs close to the STA, select an optimal candidate AP as a next switching target AP according to the STA signal strength tracked by each candidate AP, and actively cut off the connection between the STA and the current associated AP when the STA signal of the current associated AP is lower than a threshold value or is smaller than the STA signal of the optimal candidate AP, so that the STA and the AP can be rapidly switched in a short time, and the switching delay is reduced.
Specifically, as shown in fig. 1, the method includes the steps of:
step 1, STA broadcasts a detection request frame to AP on each channel, wherein the detection request frame carries STA identification and STA signal strength;
step 2, the AP receives the detection request frame, confirms whether the AP is associated according to the STA identification in the detection request frame and the locally associated STA identification, and sends report information to the AC, wherein the report information comprises the association condition of the AP and the STA and the received signal intensity of the STA;
step 3, the AC determines an associated AP and a non-associated AP according to the association condition, calculates the movement trend of the STA relative to the associated AP in one or more STA scanning periods according to the STA signal strength reported by the associated AP and the non-associated AP, and predicts candidate APs close to the STA relatively;
step 4, the AC selects the optimal candidate AP as the next switching target AP according to the STA signal intensity received by each candidate AP;
and when the STA signal of the current associated AP is lower than a threshold value or less than the STA signal of the optimal candidate AP, actively cutting off the connection between the current associated AP and the STA so that the STA is re-associated to the optimal candidate AP.
Based on the method, the invention can calculate the movement trend of the STA relative to the associated AP through the STA signal strength of the associated AP and the adjacent AP, predict candidate APs which are relatively close to the STA, select the optimal candidate AP as the next switching target AP according to the STA signal strength tracked by each candidate AP, and actively cut off the connection between the STA and the current associated AP when the STA signal of the current associated AP is lower than a threshold value or less than the STA signal of the optimal candidate AP, so that the STA and the AP can be rapidly switched in a short time, and the switching delay is reduced.
In an embodiment of the present invention, the report information further includes AP location information and/or an AP identifier, the AC determines an associated AP and a non-associated AP according to the association condition, and finds an AP adjacent to the associated AP from the AP neighbor information table as a non-associated AP according to the AP location information and/or the AP identifier of the associated AP. Therefore, the data volume in the subsequent calculation of the AC is reduced, and the response speed of the AC is improved. The AP neighbor information table is preset in the storage of the AC, and can be directly called when needed.
In another embodiment of the present invention, after the AC receives the report information sent by the associated AP and the non-associated AP, the AC may also find the neighbor APs adjacent to the associated AP from the non-associated AP according to the AP location information and/or the AP identifier of the associated AP. The position of each AP is fixed, and the AP identifier is bound with the AP position information, so that after the report information is received, the AC can directly determine the adjacent AP as a neighbor AP according to the AP identifier or the AP position information, and only the neighbor AP is used as a candidate AP in subsequent calculation, thereby simplifying the range of the target AP.
In one embodiment of the present invention, calculating the movement trend of the STA relative to the associated AP in one or more STA scanning periods comprises the following steps:
after receiving the STA signal strength reported by each AP, the AC establishes an STA signal strength set R, R = { (R) of the associated AP and the non-associated AP in one or more STA scanning periods i 1，r i 2，…，r i n），（r i+1 1，r i+1 2，…，r i+2 n），（r i+2 1，r i+2 2，…，r i+2 n），…（r i+m 1，r i+m 2，…，r i+m n) }; where n denotes the number of scans in one or more STA scanning periods, r i x represents the STA signal strength reported by the associated AP when the STA scans for the x-th time, r i+1 y、r i+2 、……、r i+m y represents the STA signal strength reported by the non-associated AP when the STA scans for the y time;
then, calculating a linear regression equation corresponding to the STA signal strengths reported by the associated AP and the non-associated AP according to the set R to obtain a slope set K, K = { K } of the associated AP and the non-associated AP i 、k i+1 、k i+2 、……、k i+m }；
And determining the movement trend of the STA relative to the associated AP according to the slope set K.
In an embodiment of the present invention, in the linear regression equation corresponding to the STA signal strength reported by the associated AP and the non-associated AP calculated according to the set R, a least square method is used to determine the linear regression equation.
In an embodiment of the present invention, the determining a movement trend of the STA relative to the associated AP according to the slope set K includes:
sorting the values in the slope set K from large to small, extracting the values with the values larger than or equal to 0 to form a set K ', extracting the values with the values smaller than 0 to form a set K' ', wherein the corresponding AP in the set K' represents the AP relatively close to the STA, and the corresponding AP in the set K '' represents the AP relatively far away from the STA. Thus, the movement tendency of the STA can be known.
In an embodiment of the present invention, the predicting the candidate APs that are relatively close to the STA specifically includes: and taking the AP corresponding to the maximum three values from the set K' as the candidate AP.
Based on the above invention, the present invention also provides a device, comprising:
the receiving module is used for receiving report information sent by the associated AP and the non-associated AP, wherein the report information comprises STA signal strength;
the calculation module is used for calculating the movement trend of the STA relative to the associated AP in one or more STA scanning periods according to the STA signal strength reported by the associated AP and the non-associated AP and predicting candidate APs which are relatively close to the STA;
the switching module selects the optimal candidate AP as the next switching target AP according to the STA signal intensity tracked by each candidate AP;
and when the STA signal of the current associated AP is lower than the threshold value or less than the STA signal of the optimal candidate AP, actively cutting off the connection between the current associated AP and the STA, so that the STA is re-associated to the optimal candidate AP.
The present invention also provides a wireless access controller, which may include: at least one processor and a memory.
And the memory is used for storing programs. In particular, the program may include program code including computer operating instructions.
The memory may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor is used for executing the computer execution instructions stored by the memory so as to execute the method in the embodiment.
The processor may be a data Processing module (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention.
Optionally, in a specific implementation, if the communication interface, the memory, and the processor are implemented independently, the communication interface, the memory, and the processor may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. Buses may be classified as address buses, data buses, control buses, etc., but do not represent only one bus or type of bus.
Optionally, in a specific implementation, if the communication interface, the memory and the processor are integrated into a chip, the communication interface, the memory and the processor may complete communication through an internal interface.
The embodiment of the invention also provides a chip which comprises a processor and an interface. Wherein the interface is used for inputting and outputting data or instructions processed by the processor. The processor is used for executing the method in the above embodiment.
The present invention also provides a computer-readable storage medium, which may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and in particular, the computer-readable storage medium stores program information for executing the method in the foregoing embodiment.
Embodiments of the present invention also provide a program, which when executed by a processor, is configured to perform the method in the above embodiments.
Embodiments of the present invention also provide a program product, such as a computer-readable storage medium, having stored therein instructions, which, when executed on a computer, cause the computer to perform the method in the above embodiments.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the invention are brought about in whole or in part when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, 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 wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device, such as a server, data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for realizing seamless switching between devices through WIFI signal strength is characterized by comprising the following steps:
receiving report information sent by an associated AP and a non-associated AP, wherein the report information comprises STA signal strength;
calculating the movement trend of the STA relative to the associated AP in one or more STA scanning periods according to the STA signal strength reported by the associated AP and the non-associated AP, and predicting candidate APs which are relatively close to the STA;
selecting an optimal candidate AP as a next switching target AP according to the STA signal intensity tracked by each candidate AP;
and when the STA signal of the current associated AP is lower than the threshold value or less than the STA signal of the optimal candidate AP, actively cutting off the connection between the current associated AP and the STA, so that the STA is re-associated to the optimal candidate AP.
2. The method of claim 1, wherein the report information further includes AP location information and/or AP identification, and after receiving the report information sent by the associated AP and the non-associated AP, the method finds out an AP adjacent to the associated AP from the AP neighbor information table as the non-associated AP according to the AP location information and/or AP identification of the associated AP.
3. The method of claim 1, wherein the report information further includes AP location information and/or AP identification, and after receiving the report information sent by the associated AP and the non-associated AP, the method finds a neighbor AP adjacent to the associated AP from the non-associated AP according to the AP location information and/or AP identification of the associated AP.
4. The method of claim 1, wherein calculating a trend of movement of the STA relative to the associated AP during one or more STA scanning periods comprises:
establishing a STA signal strength set R, R = { (R) of an associated AP and a non-associated AP in one or more STA scanning periods i 1，r i 2，…，r i n），（r i+1 1，r i+1 2，…，r i+2 n），（r i+2 1，r i+2 2，…，r i+2 n），…（r i+m 1，r i+m 2，…，r i+m n) }; where n represents the number of scans in one or more STA scanning periods, r i x represents STA signal strength reported by associated AP during the x-th scanning of STA, r i+1 y、r i+2 、……、r i+m y represents the STA signal strength reported by the non-associated AP when the STA scans for the y time;
calculating a linear regression equation corresponding to the STA signal strength reported by the associated AP and the non-associated AP according to the set R to obtain a slope set K of the associated AP and the non-associated AP, wherein K = { K = { K = i 、k i+1 、k i+2 、……、k i+m }；
And determining the movement trend of the STA relative to the associated AP according to the slope set K.
5. The method of claim 4, wherein a least square method is used to determine the linear regression equation in the linear regression equation corresponding to the STA signal strength reported by the associated AP and the non-associated AP calculated according to the set R.
6. The method of claim 4, wherein determining the movement trend of the STA relative to the associated AP according to the slope set K comprises:
sorting the values in the slope set K from large to small, extracting the values with the values larger than or equal to 0 to form a set K ', extracting the values with the values smaller than 0 to form a set K' ', wherein the corresponding AP in the set K' represents the AP relatively close to the STA, and the corresponding AP in the set K '' represents the AP relatively far away from the STA.
7. The method of claim 6, wherein predicting the candidate APs for the STA that are relatively close is specifically: and taking the AP corresponding to the maximum three values from the set K' as the candidate AP.
8. The utility model provides a device that seamless handover between equipment is realized through WIFI signal strength which characterized in that includes:
the receiving module is used for receiving report information sent by an associated AP and a non-associated AP, wherein the report information comprises STA signal strength;
the calculation module is used for calculating the movement trend of the STA relative to the associated AP in one or more STA scanning periods according to the STA signal strength reported by the associated AP and the non-associated AP and predicting candidate APs close to the STA;
the switching module selects the optimal candidate AP as the next switching target AP according to the STA signal intensity tracked by each candidate AP;
and when the STA signal of the current associated AP is lower than the threshold value or less than the STA signal of the optimal candidate AP, actively cutting off the connection between the current associated AP and the STA, so that the STA is re-associated to the optimal candidate AP.
9. The apparatus of claim 8, wherein the report information further includes AP location information and/or AP identification, and the receiving module finds an AP adjacent to the associated AP from the AP neighbor information table as the non-associated AP according to the AP location information and/or AP identification of the associated AP after receiving the report information sent by the associated AP and the non-associated AP.
10. The apparatus of claim 8, wherein the means for calculating the trend of movement of the STA relative to the associated AP during one or more STA scanning periods comprises means for:
establishing a set of STA signal strengths R, R = { (R) of associated APs and non-associated APs within one or more STA scanning periods i 1，r i 2，…，r i n），（r i+1 1，r i+1 2，…，r i+2 n），（r i+2 1，r i+2 2，…，r i+2 n），…（r i+m 1，r i+m 2，…，r i+m n) }; where n represents the number of scans in one or more STA scanning periods, r i x represents STA signal strength reported by associated AP during the x-th scanning of STA, r i+1 y、r i+2 、……、r i+m y represents the STA signal strength reported by the non-associated AP when the STA scans for the y time;
calculating a linear regression equation corresponding to the STA signal strength reported by the associated AP and the non-associated AP according to the set R to obtain the associated APAnd slope set K, K = { K) of unassociated APs i 、k i+1 、k i+2 、……、k i+m }；
And determining the movement trend of the STA relative to the associated AP according to the slope set K.
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| CN202211058021.XA CN115396969A (en) | 2022-08-30 | 2022-08-30 | Method and device for realizing seamless switching between devices through WIFI signal strength |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116669129A (en) * | 2023-08-01 | 2023-08-29 | 荣耀终端有限公司 | Network switching method and terminal equipment |
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