CN113099435B - Method for searching wireless device and mobile device using the same - Google Patents
Method for searching wireless device and mobile device using the same Download PDFInfo
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- CN113099435B CN113099435B CN202010199020.1A CN202010199020A CN113099435B CN 113099435 B CN113099435 B CN 113099435B CN 202010199020 A CN202010199020 A CN 202010199020A CN 113099435 B CN113099435 B CN 113099435B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
- G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
Abstract
The invention discloses a method for searching lost wireless device and mobile device using the method, comprising the following steps: the mobile device is wirelessly connected with the first wireless device and the second wireless device, and the mobile device sends a command for searching the first wireless device, so that the first wireless device sends first return information to the mobile device, and the first wireless device sends second return information to the second wireless device. The second wireless device transmits a second signal strength of the second backhaul information to the mobile device. The mobile device compares the first signal strength and the second signal strength of the first backhaul information to obtain a predicted direction of the first wireless device. Therefore, the method can effectively help the user to search for the lost first wireless device and avoid loss.
Description
Technical Field
The invention relates to a method for searching a wireless device and a mobile device using the method.
Background
Mobile devices (such as smart phones) have computing capabilities and mobile communication functions, and are small in size, light in weight, and easy to carry, so that they have become indispensable for modern people to carry around in their daily lives. On the other hand, in order to listen to music or meet the statutory requirements of using hands-free earphones when driving a vehicle, it is common for a mobile device user to use a wireless in-ear earphone (such as the currently available real wireless bluetooth headset or apple Air Pods) to connect with the mobile device for wireless communication, so that the in-ear speaker in the wireless earphone is used to listen to music or voice messages of a remote speaker, and the microphone in the earphone is used to receive voice messages of the user. Wireless in-ear headsets are typically wirelessly connected to mobile devices via Bluetooth (Bluetooth) short-range wireless communication.
In order to be stably placed in the ear of a user, the conventional wireless in-ear headphones generally have a small size, a light weight, no exposed signal wire, and two wireless devices separated from each other. The small-size earphone design with the separated mechanism can really and greatly improve the convenience of using, storing and storing the wireless earphone. On the other hand, it also increases the difficulty for the user to retrieve the wireless earphone when the single wireless earphone is misplaced or lost due to the ear coming out of the user. For example, in the process of user's exercise or running, if a real wireless bluetooth headset falls off from the user's ear to the ground, the real wireless bluetooth headset may be kicked to other locations by other passers-by, so that it is difficult for the user to find the lost wireless headset with the naked eye. There is a need for an improved method for using a mobile device and another headset that the user merely has to store to help locate the lost wireless headset.
Disclosure of Invention
The present invention is directed to a method for searching for a wireless device and a mobile device using the same.
To achieve the above objective, the present invention provides a method for searching a wireless device, comprising: the mobile device sends a command of searching a first wireless device; the first wireless device sends first return information to the mobile device, the first wireless device sends second return information to the second wireless device, the first return information has first signal strength, and the second return information has second signal strength; the second wireless device transmitting the second signal strength of the second backhaul message to the mobile device; comparing the first signal strength and the second signal strength of the first backhaul information to obtain a predicted direction of the first wireless device.
As an optional technical solution, the method further includes: and adjusting the relative position of the mobile device and the second wireless device according to the first signal strength and the second signal strength to obtain the accurate direction of the first wireless device.
As an optional technical solution, when the first signal strength is substantially equal to the second signal strength, the mobile device obtains the accurate direction of the first wireless device according to the relative position of the mobile device and the second wireless device.
As an optional solution, when the first signal strength is substantially equal to the second signal strength, and the mobile device and the second wireless device are located on a virtual axis, the accurate direction is through a midpoint of the virtual axis, and the accurate direction is perpendicular to the virtual axis.
As an optional technical solution, the method further includes: when the mobile device is spaced from the second wireless device by a third distance, the second wireless device sends a third wireless signal to the wireless communication unit, and the third wireless signal received by the mobile device has a third signal strength, a control unit in the mobile device obtains an environmental variable according to a distance formula, the third distance and the third signal strength, and the control unit obtains an estimated distance of the first wireless device according to the distance formula, the environmental variable and at least one of the first signal strength and the second signal strength.
Optionally, the distance formula is d =10^ ((abs (RSSI) -a)/(10 × n)), the mobile device sets d to be the third distance, sets a to be the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI to be the third signal strength, thereby obtaining the environment variable n.
As an optional technical solution, the mobile device sets a as the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI as one of the first signal strength and the second signal strength, and the control unit obtains the estimated distance according to the environment variable n and the distance formula.
As an optional technical solution, when the second wireless device is located at the left of the mobile device and the second signal strength is greater than the first signal strength, the predicted direction points to the left; when the second wireless device is located at the left of the mobile device and the second signal strength is smaller than the first signal strength, the predicted direction points to the right.
Furthermore, the present invention also provides a mobile device, comprising: a control unit and a wireless communication unit. The wireless communication unit is coupled to the control unit and is in wireless connection with the first wireless device and the second wireless device; when the control unit sends a command for searching the first wireless device, the first wireless device sends first return information to the mobile device, the first wireless device sends second return information to the second wireless device, the first return information has first signal strength, the second return information has second signal strength, and the second wireless device transmits the second signal strength of the second return information to the mobile device; the control unit compares the first signal strength and the second signal strength of the first backhaul information to obtain a predicted direction of the first wireless device.
As an optional technical solution, moving the mobile device further includes: and a display unit coupled to the control unit, wherein the display unit displays the predicted direction when the first signal strength is not equal to the second signal strength, and the display unit displays the accurate direction when the first signal strength is substantially equal to the second signal strength and the mobile device obtains the accurate direction of the first wireless device.
As an optional solution, when the first signal strength is substantially equal to the second signal strength, and the mobile device and the second wireless device are located on a virtual axis, the accurate direction is through a midpoint of the virtual axis, and the accurate direction is perpendicular to the virtual axis.
As an optional technical solution, moving the moving device further includes: when the mobile device is spaced from the second wireless device by a third distance, the second wireless device sends a third wireless signal to the wireless communication unit, the third wireless signal received by the mobile device has a third signal strength, the control unit obtains an environmental variable according to a distance formula, the third distance and the third signal strength, and the control unit obtains an estimated distance of the first wireless device according to the distance formula, the environmental variable and at least one of the first signal strength and the second signal strength.
Alternatively, the distance formula is d =10^ ((abs (RSSI) -a)/(10 × n)), the control unit sets d to be the third distance, sets a to be the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI to be the third signal strength, thereby obtaining the environment variable n.
As an optional technical solution, the control unit further sets a as the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI as one of the first signal strength and the second signal strength, and the control unit obtains the estimated distance according to the environment variable n and the distance formula.
As an optional technical solution, when the second wireless device is located at the left of the mobile device and the second signal strength is greater than the first signal strength, the predicted direction points to the left; when the second wireless device is located at the left of the mobile device and the second signal strength is smaller than the first signal strength, the predicted direction points to the right.
As an optional technical solution, the mobile device further includes an input unit coupled to the control unit, wherein the input unit is used for enabling a user to operate the command of searching the first wireless device.
The method for searching wireless devices and the mobile device using the direction of the invention utilize the mobile device to match with the user to keep the second wireless device which is not lost when the user moves the first wireless device, and can obtain the predicted direction, the accurate direction and the predicted distance of the first wireless device by comparing the first signal intensity of the first return information sent by the first wireless device to the mobile device with the second signal intensity of the second return information sent by the first wireless device to the second wireless device. Therefore, the method can effectively help the user to search for the lost first wireless device and avoid loss.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a flowchart illustrating a method of searching for a wireless device according to an embodiment of the invention.
Fig. 2 is a block diagram of a mobile device according to an embodiment of the invention.
FIG. 3A is a diagram illustrating an exemplary prompt screen of the mobile device of FIG. 2 when receiving a user operation to search for a wireless device.
FIG. 3B is a schematic diagram illustrating a user operating the mobile device when the mobile device in FIG. 3A displays a prompt.
Fig. 4A is a schematic diagram illustrating relative positions of the mobile device, the first wireless device and the second wireless device when the mobile device in fig. 2 displays the predicted direction.
Fig. 4B is another schematic angle diagram illustrating relative positions of the mobile device, the first wireless device and the second wireless device in fig. 4A.
FIG. 5A is a schematic view illustrating a screen displayed by the mobile device in a situation shown in FIG. 4A.
FIG. 5B is a schematic view illustrating a display of the mobile device of FIG. 4A under another situation.
FIG. 5C is a schematic diagram illustrating the mobile device being operated by a user in the scenario of FIG. 5A.
Fig. 6A is a schematic diagram illustrating relative positions of the mobile device, the first wireless device and the second wireless device when the mobile device in fig. 2 displays an accurate direction.
Fig. 6B is another schematic view illustrating relative positions of the mobile device, the first wireless device and the second wireless device in fig. 6A.
FIG. 7 is a schematic diagram of a display screen of the mobile device shown in FIG. 6A when displaying an accurate direction according to an embodiment.
FIG. 8 is a diagram illustrating a user operation state when the mobile device in FIG. 6A displays an accurate direction.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "side", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
In the following embodiments, the same portions are denoted by the same reference numerals in different drawings.
The method for searching the wireless device comprises the following steps: the mobile device sends a command for searching a first wireless device; the first wireless device sends first return information to the mobile device, the first wireless device sends second return information to the second wireless device, the first return information has first signal strength, and the second return information has second signal strength; the second wireless device transmitting the second signal strength to the mobile device; and comparing the first signal strength with the second signal strength to obtain the predicted direction of the first wireless device.
In one embodiment, the method further comprises: the relative position of the mobile device and the second wireless device is adjusted according to the first signal strength and the second signal strength to obtain the accurate direction of the first wireless device.
In one embodiment, when the first signal strength is substantially equal to the second signal strength, the mobile device obtains the accurate direction of the first wireless device according to the relative position of the mobile device and the second wireless device.
Further, when the first signal strength and the second signal strength are substantially equal, and the mobile device and the second wireless device are located on the virtual axis, the exact direction is through the middle point of the virtual axis, and the exact direction is perpendicular to the virtual axis.
In one embodiment, the method further comprises: when the mobile device is spaced from the second wireless device by a third distance, the second wireless device sends a third wireless signal to the wireless communication unit, the third wireless signal received by the mobile device has a third signal strength, the control unit in the mobile device obtains an environmental variable according to the distance formula, the third distance and the third signal strength, and the control unit obtains the estimated distance of the first wireless device according to the distance formula, the environmental variable and at least one of the first signal strength and the second signal strength.
Further, the distance formula is d =10^ ((abs (RSSI) -a)/(10 × n)), the mobile device sets d to be a third distance, sets a to be the wireless signal strength of the second wireless device received by the mobile device when the mobile device is spaced apart from the second wireless device by 1 meter, and sets RSSI to be the third signal strength, thereby obtaining the environment variable n.
Further, the mobile device sets a as the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI as one of the first signal strength and the second signal strength, and the control unit obtains the estimated distance according to the environment variable n and the distance formula.
In one embodiment, when the second wireless device is located to the left of the mobile device and the second signal strength is greater than the first signal strength, the predicted direction points to the left; when the second wireless device is located at the left of the mobile device and the second signal strength is smaller than the first signal strength, the predicted direction is directed to the right.
The invention also provides a mobile device which comprises a control unit and a wireless communication unit. The wireless communication unit is coupled to the control unit and is in wireless connection with the first wireless device and the second wireless device; when the control unit sends a command of searching the first wireless device, the first wireless device sends first return information to the mobile device, the first wireless device sends second return information to the second wireless device, the first return information has first signal strength, the second return information has second signal strength, and the second wireless device transmits the second signal strength to the mobile device; the control unit compares the first signal strength with the second signal strength to obtain a predicted direction of the first wireless device.
In an embodiment, the mobile device further includes a display unit coupled to the control unit, wherein the display unit displays the predicted direction when the first signal strength is not equal to the second signal strength, and the display unit displays the correct direction when the first signal strength is substantially equal to the second signal strength and the mobile device obtains the correct direction of the first wireless device.
In one embodiment, when the first signal strength and the second signal strength are substantially equal, and the mobile device and the second wireless device are located on the virtual axis, the precise direction is through the middle point of the virtual axis, and the precise direction is perpendicular to the virtual axis.
In one embodiment, the mobile device further comprises: when the mobile device and the second wireless device are spaced by a third distance, the second wireless device sends a third wireless signal to the wireless communication unit, the third wireless signal received by the mobile device has a third signal strength, the control unit obtains an environment variable according to the distance formula, the third distance and the third signal strength, and the control unit obtains the estimated distance of the first wireless device according to the distance formula, the environment variable and at least one of the first signal strength and the second signal strength.
Further, the distance formula is d =10^ ((abs (RSSI) -a)/(10 × n)), the control unit sets d to be a third distance, sets a to be the wireless signal strength of the second wireless device received by the mobile device when the mobile device is spaced apart from the second wireless device by 1 meter, and sets RSSI to be the third signal strength, and obtains the environment variable n.
Further, the control unit further sets a as the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI as one of the first signal strength and the second signal strength, and the control unit obtains the estimated distance according to the environment variable n and the distance formula.
In one embodiment, when the second wireless device is located to the left of the mobile device and the second signal strength is greater than the first signal strength, the predicted direction points to the left; when the second wireless device is located at the left of the mobile device and the second signal strength is smaller than the first signal strength, the predicted direction is directed to the right.
In an embodiment, the mobile device further includes an input unit, the input unit is coupled to the control unit, and the input unit is used for enabling a user to search for the first wireless device command.
Referring to fig. 1, a flowchart of a method for searching for a wireless device according to an embodiment of the invention is shown, the method for searching for a wireless device including steps 102-110. Referring to fig. 2, a block diagram of a mobile device according to an embodiment of the invention is shown, in the embodiment, the mobile device is illustrated as a mobile phone 200, the first wireless device and the second wireless device are illustrated as a left ear earphone 300 and a right ear earphone 310 of a pair of bluetooth earphones, respectively, and the first wireless connection WL1 to the third wireless connection WL3 are illustrated as bluetooth wireless connections, but the invention is not limited thereto.
As shown in fig. 2, the mobile phone 200 includes an application 201, an input unit 202, a control unit 204, a display unit 206, and a wireless communication unit 208. The display unit 206 and the wireless communication unit 208 are both coupled to the control unit 204, the wireless communication unit 208 establishes a first wireless connection WL1 and a second wireless connection WL2 with the left ear earphone 300 and the right ear earphone 310, respectively, and also establishes a third wireless connection WL3 between the left ear earphone 300 and the right ear earphone 310. Through the first wireless connection WL1, the mobile phone 200 transmits the audio data of the left channel to the left ear headphone 300, and the left ear headphone 300 can reply to the mobile phone 200 to confirm whether the audio data of the left channel is successfully received. Similarly, through the second wireless connection WL2, the mobile phone 200 transmits the audio data of the right channel to the right ear headphone 310, and the right ear headphone 310 can reply to the mobile phone 200 confirming whether the audio data of the right channel is successfully received. Through the third wireless connection WL3, the left ear earphone 300 and the right ear earphone 310 communicate with each other to synchronize the currently played audio data, and it is ensured that the left and right channel audio data played by the left ear earphone 300 and the right ear earphone 310 correspond to each other at the same time point. Wherein the first backhaul information received by the mobile phone 200 from the left ear headset 300 has a first signal strength, and the second backhaul information received by the right ear headset 310 from the left ear headset 300 has a second signal strength. The signal strength of the first wireless link WL1 and the second wireless link WL2 is calibrated by default, and when the distance between the mobile phone 200 and the left ear phone 300 is a first distance D1, the distance between the left ear phone 300 and the right ear phone 310 is a second distance D2, and the first distance D1 is equal to the second distance D2, the first signal strength is equal to the second signal strength. In operation, the signals are transmitted mutually, so the backhaul information received by the first wireless device from the mobile device also has a first signal strength, and the backhaul information received by the first wireless device from the second wireless device also has a second signal strength.
In step 102, a user may input a user operation Ipt to an application 201 executed in the mobile phone 200 by operating an input unit 202 (e.g., a touch panel) in the mobile phone 200. For example, the user may select one of the left ear earphone 300 and the right ear earphone 310 to be searched in the screen of the application 201 displayed on the display unit 206 (e.g., lcd) of the mobile phone 200. I.e., identify the wireless device to be searched. Assuming that the left ear earphone 300 is lost and the right ear earphone 310 is still retained on the user, the user selects the left ear earphone 300 to be searched in the application 201, so that the control unit 204 of the mobile phone 200 issues a command to search the left ear earphone 300.
In step 103, after the left ear phone 300 receives the command to search the left ear phone 300, the left ear phone 300 sends a first feedback message to the mobile phone 200, the first feedback message has a first signal strength, and the left ear phone 300 sends a second feedback message to the right ear phone 310, the second feedback message has a second signal strength.
In step 104, the right ear earphone 310 transmits the second signal strength of the second backhaul information to the mobile phone 200.
In step 105, the control unit 204 of the mobile phone 200 compares the signal strength of the first backhaul information (i.e., the first signal strength) with the signal strength of the second backhaul information (i.e., the second signal strength) to obtain the predicted direction Dir _1 of the left ear earphone 300.
In step 106, the display unit 206 displays the predicted direction Dir _1, suggesting that the user adjust the relative position between the mobile phone 200 and the right ear phone 310 according to the first signal strength and the second signal strength. For example, when the first signal strength is not equal to the second signal strength, the display unit 206 displays the predicted direction Dir _1 to suggest the user to turn the body in a first direction or a second direction, wherein the first direction is, for example, to turn the body left or clockwise, and the second direction is, for example, to turn the body right or counterclockwise, so as to adjust the relative positions of the mobile phone 200 and the right ear phone 310.
In step 107, the control unit 204 compares whether the first signal strength and the second signal strength are substantially equal. If yes, go to step 108; if not, go back to step 106.
In step 108, the control unit 204 obtains the accurate direction of the left ear phone 300 and causes the display unit 206 to display the accurate direction of the left ear phone 300.
In step 110, the control unit 204 calculates the estimated distance Dist of the left ear earphone 300 and causes the display unit 206 to display the estimated distance Dist.
Referring to fig. 3A, a schematic diagram of an embodiment of a prompt screen Dir _0 when the mobile phone 200 in fig. 2 receives a user operation Ipt to search for a wireless device is shown. The content of the prompt screen Dir _0 displayed by the display unit 206 in the mobile phone 200 is, for example: in the process of searching for a missing headset, please hold the mobile phone 200 with the right hand and hold the known headset with the left hand. Referring to fig. 3B, a schematic diagram of the mobile phone 200 operated by the user when the mobile phone 200 in fig. 3A displays the prompt screen Dir _0 is shown. After the user reads the prompt screen Dir _0, the user keeps holding the mobile phone 200 with the right hand and holds the known left-ear earphone 310 with the left hand as shown in fig. 3B to search for a missing earphone. The right ear phone 310, thus known in position, is located to the left of the mobile phone 200, centered on the direction of viewing of the user's eyes.
Referring to fig. 4A to 4B, fig. 4A is a schematic diagram illustrating relative positions of the mobile phone 200, the left ear phone 300 and the right ear phone 310 when the predicted direction Dir _1 is displayed on the mobile phone 200 in fig. 2. Fig. 4B is a schematic top view of the mobile phone 200, the left ear phone 300 and the right ear phone 310 in fig. 4A. As shown in fig. 4A, it is assumed that the distance between the mobile phone 200 and the left ear phone 300 is a first distance D1, the distance between the left ear phone 300 and the right ear phone 310 is a second distance D2, and the first distance D1 is greater than the second distance D2. Since the signal strength of the first wireless connection WL1 and the second wireless connection WL2 are calibrated in advance, the first signal strength is equal to the second signal strength when the first distance D1 is equal to the second distance D2. Therefore, as shown in fig. 4A, the first signal strength is smaller than the second signal strength because the first distance D1 is greater than the second distance D2. Corresponding to steps 103-106 of the flowchart shown in fig. 1, at this time, (1) the control unit 204 compares the first signal strength with the second signal strength to determine that the first signal strength is smaller than the second signal strength, and (2) as shown in fig. 3B, the user holds the mobile phone 200 with the right hand and holds the right ear phone 310, which is known to be still around, with the left hand, so that the right ear phone 310 with a known position is located at the left of the mobile phone 200; therefore, the control unit 204 determines that the predicted direction Dir _1 of the left ear headphone 300 is to the left, and controls the display unit 206 to display the predicted direction Dir _1 with the arrow pointing to the left. In the present embodiment, the user takes the mobile phone 200 with the right hand and the headset 310 with the right ear with the left hand as an example, but not limited thereto. The content of the prompt screen Dir _0 may also be designed as follows: in the process of searching for a lost earphone, please hold the mobile phone 200 with the left hand and hold the known earphone with the right hand, but in the steps shown in fig. 4A to 4B, when the first signal strength received by the mobile phone 200 is smaller than the second signal strength received by the right earphone 310, the arrow in the prediction direction Dir _1 displayed by the display unit 206 is controlled to face the right direction.
Referring to fig. 5A-5B, schematic views of display frames of the mobile phone 200 in fig. 4A in different situations when the predicted direction Dir _1 is displayed are shown. When the control unit 204 determines that the first signal strength (the signal strength of the left ear earphone 300 received by the mobile phone 200) is less than the second signal strength (the signal strength of the left ear earphone 300 received by the right ear earphone 310), and the user holds the right ear earphone 310, which is known to be still around, with the left hand, the control unit 204 may cause the display unit 206 to display the predicted direction Dir _1 as a left arrow as shown in fig. 5A, and may optionally display a prompt text "please hold the mobile phone with both hands and rotate the known earphone to the left". Conversely, when the control unit 204 determines that the first signal strength is greater than the second signal strength and the user holds the right-ear earphone 310, which is known to be still around, with the left hand, the control unit 204 will cause the display unit 206 to display the predicted direction Dir _1 as a right arrow as shown in fig. 5B, and optionally display the prompt text "please hold the mobile phone with both hands and rotate the known earphone to the right".
Referring to fig. 5C, a schematic diagram of the mobile phone 200 operated by the user in the situation that the display unit 206 of the mobile phone 200 in fig. 5A displays the predicted direction Dir _1 is shown. After the user reads the predicted direction Dir _1 (either the left arrow or the right arrow) and the optionally displayed prompt text, the user holds the mobile phone 200 with the right hand and holds the known right ear phone 310 with the left hand, keeps the left and right hand postures as shown in fig. 3B, and turns the body according to the predicted direction Dir _1 displayed on the display unit 206. As shown in fig. 5C, assuming that the current display unit 206 displays the left arrow prediction direction Dir _1 as shown in fig. 5A, the user rotation direction Dir _ R is rotated left around the user himself.
Referring to fig. 6A to 6B, fig. 6A is a schematic diagram illustrating relative positions of the mobile phone 200, the left ear phone 300 and the right ear phone 310 when the mobile phone 200 in fig. 2 shows an accurate direction. Fig. 6B is a schematic top view of the mobile phone 200, the left ear phone 300 and the right ear phone 310 in fig. 6A. As shown in fig. 6A, when the user continues to rotate left around himself until the first distance D1 is equal to the second distance D2, the first signal strength is equal to the second signal strength. Corresponding to steps 107-110 of the flowchart shown in fig. 1, at this time, (1) after comparing the first signal strength with the second signal strength, the control unit 204 determines that the first signal strength is equal to the second signal strength, and (2) as shown in fig. 3B, the user holds the mobile phone 200 with the right hand and holds the right ear phone 310, which is known to be still around, with the left hand, keeping the left and right hand postures flat. As shown in fig. 6B, the mobile phone 200 and the right ear phone 310 are located on a virtual axis Ax, the mobile phone 200 is located at the right end point Ax _ R of the virtual axis, and the right ear phone 310 is located at the left end point Ax _ L of the virtual axis. Since the first distance D1 is substantially equal to the second distance D2, the positions of the mobile phone 200, the left ear phone 300 and the right ear phone 310 form a substantially isosceles triangle. The exact direction is the middle line of the substantially isosceles triangle, which is the middle line passing through the virtual axis Ax _ C and perpendicular to the virtual axis Ax. Referring to fig. 7, a schematic diagram of a display screen of the mobile phone 200 in fig. 6A showing an accurate direction according to an embodiment is shown. The control unit 204 will make the display unit 206 display the exact direction as shown in fig. 7 as an upward arrow, and can optionally display the prompt text "direction of missing earphone: in the vertical direction of the center point of the line connecting the mobile phone and the known headset position ".
As shown in fig. 7, the control unit 204 is configured to selectively enable the display unit 206 to display the estimated distance Dist and display prompt words, such as: "distance to lose earphone: about 3.5 meters ". Wherein the predicted distance Dist of the lost earphone is 3.5 m according to the Bluetooth radio wave intensity-distance formula d =10 ^ ((abs (RSSI) -a)/(10 × n)), and was calculated by the following procedure. The wireless right-ear earphone 310 and the left-ear earphone 300 are designed to have the same radio wave emission intensity in advance, so the same bluetooth radio wave intensity-distance formula is applied. In this equation, the variable d is (1) the distance between the mobile phone 200 and either the right ear phone 310 or the left ear phone 300, and (2) the variable a is the known wireless signal strength of the return message received by the mobile phone 200 from either the right ear phone 310 or the left ear phone 300 when the mobile phone 200 is 1 meter away from either the right ear phone 310 or the left ear phone 300. (3) The variable RSSI is the strength of the bluetooth headset wireless signal received by the mobile phone 200 when the mobile phone 200 is spaced d meters apart from either the right ear headset 310 or the left ear headset 300. The environment variable n is the attenuation degree of the current environment to the intensity of the Bluetooth electric wave. Wherein the environment variable n must be obtained only if the left ear headphone 300 is missing and measured in the field.
As shown in fig. 6A-6B, the mobile phone 200 is spaced apart from the right ear phone 310 by a third distance D3, where the third distance D3 is approximately equal to the known distance from the left palm to the right palm of the user when the user is holding the left-right hand in a flat posture. The control unit 204 causes the right ear speaker 310 to transmit the third wireless signal to the wireless communication unit 208 in the mobile phone 200, and the third wireless signal received by the mobile phone 200 has the third signal strength. The control unit 204 substitutes variable D into a known third distance D3 according to the distance formula D =10^ ((abs (RSSI) -a)/(10 × n)), (1) substitutes variable RSSI into the third signal strength measured by the mobile phone 200, and (3) substitutes variable a into the wireless signal strength received by the mobile phone 200 when the distance between the mobile phone 200 and the right ear earphone 310 is 1 meter apart. Thus, the control unit 204 calculates an environment variable n of the bluetooth wave intensity attenuation of the environment where the mobile phone 200 is currently located.
After obtaining the environment variable n, the control unit 204 further substitutes (1) the environment variable n just obtained by calculation, (2) the variable a substitutes the wireless signal strength of the right ear phone 310 received by the mobile phone 200 when the distance between the mobile phone 200 and the right ear phone 310 is known to be 1 meter, and (3) the variable RSSI substitutes at least one of the first signal strength and the second signal strength measured by the mobile phone 200 according to the distance formula. Thus, the control unit 204 calculates the variable d according to the distance formula d =10^ ((abs (RSSI) -a)/(10 × n)), and uses the result as the estimated distance Dist of the left ear earphone 300.
Please refer to fig. 8, which illustrates a user operation state diagram when the mobile phone 200 in fig. 6A displays an accurate direction. After the user reads the correct direction (pointing up arrow) and the selectively displayed prompt text, it is expected that the user will hold the mobile phone 200 with the right hand and hold the known right ear phone 310 with the left hand, keeping the left and right hand postures as shown in fig. 3B, and moving the body according to the correct direction displayed by the display unit 206. As shown in fig. 8, assuming that the current display unit 206 displays the upward arrow prediction direction Dir _1 shown in fig. 8, the user moving direction Dir _ M substantially starts from the user himself (equal to the center point of the connection line between the two positions of the mobile phone 200 and the known right ear earphone 310), and moves forward along the vertical direction parallel to the connection line between the two positions of the mobile phone 200 and the known right ear earphone 310, and during the user moving process, as the first signal strength and the second signal strength received by the mobile phone 200 change, the estimated distance Dist displayed on the display unit 206 is dynamically adjusted in coordination, for example, gradually decreased from the original 3.5 meters to 0 meters, so as to more effectively assist the user in finding the lost left ear earphone 300.
When a user loses one of the expensive wireless earphones 300, the invention utilizes the mobile phone 200 to match with the other wireless earphone 310 which is still not lost, and by comparing the first signal strength of the first backhaul message sent by one wireless earphone 300 to the mobile phone 200 with the second signal strength of the second backhaul message sent by one wireless earphone 300 to the other wireless earphone 310, the predicted direction Dir _1, the accurate direction Dir _2 and the predicted distance Dist of one wireless earphone 300 can be obtained. Therefore, the method can effectively help the user to search for the lost wireless earphone, and avoid the expensive loss that one earphone cannot be used as the result of one earphone being short.
The method for searching wireless devices and the mobile device using the direction of the invention utilize the mobile device to match with the user to keep the second wireless device which is not lost when the user moves the first wireless device, and can obtain the predicted direction, the accurate direction and the predicted distance of the first wireless device by comparing the first signal intensity of the first return information sent by the first wireless device to the mobile device with the second signal intensity of the second return information sent by the first wireless device to the second wireless device. Therefore, the method can effectively help the user to search for the lost first wireless device and avoid loss.
The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims. The scope of the invention is therefore to be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the scope of the appended claims.
Claims (16)
1. A method for searching for a wireless device, comprising:
the mobile device sends a command for searching a first wireless device;
the first wireless device sends first return information to the mobile device, the first wireless device sends second return information to the second wireless device, the first return information has first signal strength, and the second return information has second signal strength;
the second wireless device transmitting the second signal strength of the second backhaul information to the mobile device; and
comparing the first signal strength of the first backhaul information with the second signal strength of the second backhaul information to obtain a predicted direction of the first wireless device;
the obtaining of the predicted direction of the first wireless device includes determining a distance between the first wireless device and the mobile device and a distance between the first wireless device and the second wireless device according to a magnitude relationship between the first signal strength and the second signal strength to obtain the predicted direction.
2. The method of claim 1, wherein: the method further comprises the following steps: and adjusting the relative position of the mobile device and the second wireless device according to the first signal strength and the second signal strength to obtain the accurate direction of the first wireless device.
3. The method of claim 1, wherein: when the first signal strength is substantially equal to the second signal strength, the mobile device obtains the accurate direction of the first wireless device according to the relative position of the mobile device and the second wireless device.
4. The method of claim 3, wherein: when the first signal strength is substantially equal to the second signal strength, and the mobile device and the second wireless device are located on a virtual axis, the accurate direction is a midpoint passing through the virtual axis, and the accurate direction is perpendicular to the virtual axis.
5. The method of claim 1, wherein: the mobile device has a wireless communication unit, the method further comprising: when the mobile device and the second wireless device are spaced by a third distance, the second wireless device sends a third wireless signal to the wireless communication unit, the third wireless signal received by the mobile device has a third signal strength, a control unit in the mobile device obtains an environment variable according to a distance formula, the third distance and the third signal strength, and the control unit obtains the estimated distance of the first wireless device according to the distance formula, the environment variable and at least one of the first signal strength and the second signal strength.
6. The method of claim 5, wherein: the distance formula is d =10^ ((abs (RSSI) -A)/(10 x n)), the mobile device sets d as the third distance, sets A as the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are separated by 1 meter, sets RSSI as the third signal strength, and obtains the environment variable n.
7. The method of claim 6, wherein: the mobile device sets a as the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI as one of the first signal strength and the second signal strength, and the control unit obtains the estimated distance according to the environment variable n and the distance formula.
8. The method of claim 1, wherein: when the second wireless device is positioned at the left of the mobile device and the second signal intensity is greater than the first signal intensity, the predicted direction points to the left; when the second wireless device is located at the left of the mobile device and the second signal strength is smaller than the first signal strength, the predicted direction points to the right.
9. A mobile device, characterized in that the mobile device comprises:
a control unit; and
the wireless communication unit is coupled to the control unit and is in wireless connection with the first wireless device and the second wireless device;
when the control unit sends a command for searching the first wireless device, the first wireless device sends first return information to the mobile device, the first wireless device sends second return information to the second wireless device, the first return information has first signal strength, the second return information has second signal strength, and the second wireless device transmits the second signal strength of the second return information to the mobile device;
the control unit compares the first signal strength of the first backhaul information with the second signal strength of the second backhaul information to obtain a predicted direction of the first wireless device;
the obtaining of the predicted direction of the first wireless apparatus includes determining a distance between the first wireless apparatus and the mobile apparatus and a distance between the first wireless apparatus and the second wireless apparatus according to a magnitude relationship between the first signal strength and the second signal strength to obtain the predicted direction.
10. The mobile device of claim 9, wherein: moving the mobile device further comprises: and a display unit coupled to the control unit, wherein the display unit displays the predicted direction when the first signal strength is not equal to the second signal strength, and the display unit displays the accurate direction when the first signal strength is substantially equal to the second signal strength and the mobile device obtains the accurate direction of the first wireless device.
11. The mobile device of claim 10, wherein: when the first signal strength is substantially equal to the second signal strength, and the mobile device and the second wireless device are located on a virtual axis, the accurate direction is a midpoint passing through the virtual axis, and the accurate direction is perpendicular to the virtual axis.
12. The mobile device of claim 9, wherein: the mobile device has a wireless communication unit, and the mobile device further includes: when the mobile device and the second wireless device are spaced by a third distance, the second wireless device sends a third wireless signal to the wireless communication unit, the third wireless signal received by the mobile device has a third signal strength, the control unit obtains an environment variable according to a distance formula, the third distance and the third signal strength, and the control unit obtains the estimated distance of the first wireless device according to the distance formula, the environment variable and at least one of the first signal strength and the second signal strength.
13. The mobile device of claim 12, wherein: the distance formula is d =10^ ((abs (RSSI) -A)/(10 x n)), the control unit sets d to be the third distance, sets A to be the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are separated by 1 meter, and sets RSSI to be the third signal strength, and obtains the environment variable n.
14. The mobile device of claim 13, wherein: the control unit further sets A as the wireless signal strength of the second wireless device received by the mobile device when the mobile device and the second wireless device are spaced apart by 1 meter, and sets RSSI as one of the first signal strength and the second signal strength, and the control unit obtains the estimated distance according to the environment variable n and the distance formula.
15. The mobile device of claim 9, wherein: when the second wireless device is positioned at the left of the mobile device and the second signal intensity is greater than the first signal intensity, the predicted direction points to the left; when the second wireless device is located at the left of the mobile device and the second signal strength is smaller than the first signal strength, the predicted direction points to the right.
16. The mobile device of claim 9, wherein: the mobile device further comprises an input unit coupled to the control unit, wherein the input unit is used for enabling a user to operate the command for searching the first wireless device.
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| CN202010019362 | 2020-01-08 | ||
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| CN104320751A (en) * | 2014-10-14 | 2015-01-28 | 浙江大学 | Article searching method based on Bluetooth signal strength |
| CN108111996A (en) * | 2017-12-07 | 2018-06-01 | 联想(北京)有限公司 | The lookup method and equipment of bluetooth headset |
| CN109618290A (en) * | 2017-09-07 | 2019-04-12 | 建汉科技股份有限公司 | Freedom positioning system |
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| TWM474970U (en) * | 2013-12-06 | 2014-03-21 | Univ Kao Yuan | Wireless lost-and-found device |
| CN104320751A (en) * | 2014-10-14 | 2015-01-28 | 浙江大学 | Article searching method based on Bluetooth signal strength |
| CN109618290A (en) * | 2017-09-07 | 2019-04-12 | 建汉科技股份有限公司 | Freedom positioning system |
| CN108111996A (en) * | 2017-12-07 | 2018-06-01 | 联想(北京)有限公司 | The lookup method and equipment of bluetooth headset |
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