CN106856588B - Frequency point selection method and device for Bluetooth equipment - Google Patents
Frequency point selection method and device for Bluetooth equipment Download PDFInfo
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- CN106856588B CN106856588B CN201510906953.9A CN201510906953A CN106856588B CN 106856588 B CN106856588 B CN 106856588B CN 201510906953 A CN201510906953 A CN 201510906953A CN 106856588 B CN106856588 B CN 106856588B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
A frequency point selection method and a device of Bluetooth equipment are provided, the method comprises the following steps: sending a data packet to opposite terminal equipment on all frequency points in the Bluetooth frequency point list; adjusting the priority of the frequency points in the Bluetooth frequency point list, including: when the response data packet sent by the opposite terminal equipment is not successfully received on the frequency point n, the priority of the frequency point n is reduced; and selecting a frequency point with a priority higher than a preset priority G1 from the Bluetooth frequency point list as a working frequency point. By adopting the method and the device, the working frequency point with smaller interference value can be selected.
Description
Technical Field
The invention relates to the field of Bluetooth communication, in particular to a frequency point selection method and device of Bluetooth equipment.
Background
Bluetooth (BT) operates in the Industrial Scientific Medical (ISM) frequency band. The ISM band is an open band and can be used without authorization.
At present, the frequency band of a part of channels of WIFI is also in ISM frequency band. For bluetooth devices, there may be strong WIFI signal interference. When the interference is serious, the Bluetooth equipment can be greatly influenced, and the problems of listening to songs, blocking, noise in Bluetooth communication and the like occur.
In the prior art, an Adaptive Frequency Hopping (AFH) technology is introduced into bluetooth 1.2, so as to improve the performance of bluetooth devices and avoid the bluetooth devices from being interfered by other surrounding devices operating in the ISM Frequency band. When detecting that the interference of the Bluetooth equipment on certain frequency points is serious, adjusting the working frequency point of the Bluetooth equipment to a frequency point with smaller interference by an AFH method.
When the conventional AFH method is executed, the Strength of a periodic interference Signal is usually detected by receiving a Signal Strength Indication (RSSI), and a frequency point with a smaller interference value is selected as a working frequency point according to a Signal Strength value.
However, the working frequency points selected by the existing AFH method still have the possibility of large interference values.
Disclosure of Invention
The invention solves the technical problem of how to select the working frequency point with smaller interference value.
In order to solve the above technical problem, an embodiment of the present invention provides a method for selecting a frequency point of a bluetooth device, including:
sending a data packet to opposite terminal equipment on all frequency points in the Bluetooth frequency point list;
adjusting the priority of the frequency points in the Bluetooth frequency point list, including: when the response data packet sent by the opposite terminal equipment is not successfully received on the frequency point n, the priority of the frequency point n is reduced;
and selecting a frequency point with a priority higher than a preset priority G1 from the Bluetooth frequency point list as a working frequency point.
Optionally, the method for selecting a frequency point of the bluetooth device further includes: when the priority of the frequency point n is lower than a preset priority level G2, removing the frequency point n from the Bluetooth frequency point list; wherein G2 is less than G1.
Optionally, the adjusting the priority of the frequency points in the bluetooth frequency point list further includes: and reducing the priority of at least two frequency points adjacent to the frequency value of the frequency point n in the Bluetooth frequency point list.
Optionally, the method for selecting a frequency point of the bluetooth device further includes: and when detecting that the frequency point y with the deviation of the frequency value of the frequency point n larger than 10MHz is not in the Bluetooth frequency point list, adding the frequency point y to the Bluetooth frequency point list, and setting the priority of the frequency point y to be a preset priority level G3, wherein G2 is more than G3 and more than G1.
Optionally, the adjusting the priority of the frequency points in the bluetooth frequency point list further includes: and when the response data packet is continuously and successfully received for multiple times on the frequency point m, the priority of at least two frequency points adjacent to the frequency value of the frequency point m in the Bluetooth frequency point list is improved.
Optionally, the method for selecting a frequency point of the bluetooth device further includes: when detecting that the frequency point z adjacent to the frequency value of the frequency point m is not in the Bluetooth frequency point list, adding the frequency point z to the Bluetooth frequency point list, and setting the priority of the frequency point z to be a priority level G4, wherein G2 is more than G4 and is more than G1.
In order to solve the above problem, an embodiment of the present invention further provides a device for selecting a frequency point of a bluetooth device, including:
the transmitting unit is used for transmitting a data packet to the opposite terminal equipment on all frequency points in the Bluetooth frequency point list;
the adjusting unit is used for adjusting the priority of the frequency points in the Bluetooth frequency point list, and when a response data packet sent by the opposite terminal equipment is not successfully received on the frequency point n, the priority of the frequency point n is reduced;
and the selecting unit is used for selecting the frequency point with the priority higher than the preset priority G1 from the Bluetooth frequency point list as the working frequency point.
Optionally, the frequency point selecting device of the bluetooth device further includes: the removing unit is used for removing the frequency point n from the Bluetooth frequency point list when the priority of the frequency point n is lower than the preset priority G2; wherein G1 > G2.
Optionally, the adjusting unit is further configured to: and reducing the priority of at least two frequency points adjacent to the frequency value of the frequency point n in the Bluetooth frequency point list.
Optionally, the adjusting unit is further configured to: and when detecting that the frequency point y with the deviation of the frequency value of the frequency point n larger than 10MHz is not in the Bluetooth frequency point list, adding the frequency point y to the Bluetooth frequency point list, and setting the priority of the frequency point y to be a preset priority level G3, wherein G2 is more than G3 and more than G1.
Optionally, the adjusting unit is further configured to: and when the response data packet is continuously and successfully received for multiple times on the frequency point m, the priority of at least two frequency points adjacent to the frequency value of the frequency point m in the Bluetooth frequency point list is improved.
Optionally, the adjusting unit is further configured to: when detecting that the frequency point z adjacent to the frequency value of the frequency point m is not in the Bluetooth frequency point list, adding the frequency point z to the Bluetooth frequency point list, and setting the priority of the frequency point z to be a priority level G4, wherein G2 is more than G4 and is more than G1.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
when the data packet sent by the opposite terminal equipment cannot be successfully received on the frequency point n, the performance of the frequency point n is judged to be poor, and large interference may exist, so that the priority of the frequency point n is reduced. When the working frequency point is selected, the frequency point with the priority higher than a certain level is selected from the Bluetooth frequency point list for data transmission, and the frequency point which is greatly influenced by interference is eliminated, so that the frequency point with a small interference value can be selected as the working frequency point.
Further, when the priority of the frequency point n is reduced to be smaller than the priority G2, the frequency point n is judged to be seriously affected by interference at present, the frequency point n is removed from the Bluetooth frequency point list, and the time of the Bluetooth equipment for traversing the Bluetooth frequency point list can be saved.
Drawings
Fig. 1 is a flowchart of a frequency point selection method of a bluetooth device in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a frequency point selecting device of a bluetooth device in an embodiment of the present invention.
Detailed Description
In the prior art, when the AFH method is executed, the strength of a periodic interference signal is usually detected by RSSI, and a frequency point with a smaller interference value is selected as a working frequency point through a signal strength value obtained by calculation. However, when the interference evaluation is performed on the frequency point according to the RSSI, the characteristics of the interference are not considered and a targeted evaluation is made. In a complex environment, for example, there are many routers or other interfering devices with same frequency band interference around a bluetooth device, the selected frequency point is not necessarily a frequency point with less interference. Meanwhile, the existing RRSI method has certain inaccuracy. In summary, the working frequency points selected by the existing AFH method still have the possibility of large interference values.
In the embodiment of the present invention, when the data packet sent by the peer device is not successfully received at frequency point n, it is determined that the performance of frequency point n is poor and there may be large interference, so that the priority of frequency point n is reduced. When the working frequency point is selected, the frequency point with the priority higher than a certain level is selected from the Bluetooth frequency point list for data transmission, and the frequency point which is greatly influenced by interference is eliminated, so that the frequency point with a small interference value can be selected as the working frequency point.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the invention provides a frequency point selection method of a Bluetooth device, which is described in detail by referring to FIG. 1 through specific steps.
And step S101, sending a data packet to opposite terminal equipment on all frequency points in the Bluetooth frequency point list.
In the specific implementation, the bluetooth equipment coexists at 79 working frequency points in the working process, the frequency of the 79 working frequency points is 2402 MHz-2480 MHz in sequence, and the interval between two adjacent frequency points is 1 MHz. When the interference on some frequency points is detected to be serious, the frequency points with the serious interference can be avoided through an AFH method, and the frequency points with the light interference, namely the better performance, are selected.
When the Bluetooth equipment works, after data transmission is finished on one working frequency point, the Bluetooth equipment jumps to another working frequency point to continue data transmission. The transmission sequence of the working frequency points is pseudo-random, and the Bluetooth device can transmit and receive data 1600 times at 79 frequency points every second, and the duration of each data transmission and reception is 625 mus. In the embodiment of the invention, 79 working frequency points can be firstly constructed into a Bluetooth frequency point list, and the Bluetooth equipment selects frequency points in the Bluetooth frequency point list to transmit and receive data.
In practical applications, the peer device may refer to a device that receives a data packet. And after receiving the data packet sent by the current Bluetooth equipment, the opposite terminal equipment feeds back a response data packet corresponding to the data packet to the current Bluetooth equipment. The relationship between the current bluetooth device and the peer-to-peer device may be a master-slave relationship or a peer-to-peer relationship.
And S102, adjusting the priority of the frequency points in the Bluetooth frequency point list.
In a specific implementation, the bluetooth frequency point list may include frequency points and priority information corresponding to the frequency points. The priorities of different frequency points may be the same or different. In the initialization state, 79 frequency points can be included in the bluetooth frequency point list, and the initial priority of each frequency point is the same.
The priority of the frequency points in the Bluetooth frequency point list is adjustable. In the embodiment of the present invention, the priority of the frequency point may be adjusted according to whether the response data packet sent by the peer device is received on a certain frequency point. The priority of the frequency point is adjusted, which may be to increase the priority of the frequency point or to decrease the priority of the frequency point.
For example, when the response data packet sent by the peer device is not received at frequency point n, or the response data packet received at frequency point n cannot be correctly analyzed, it may be determined that the response data packet sent by the peer device is not successfully received at frequency point n. At this time, the performance of the frequency point n is determined to be poor, and the priority of the frequency point n can be reduced.
In the embodiment of the present invention, when the frequency point n is continuously interfered more seriously, the response data packet may not be successfully received on the frequency point n for many times. And reducing the priority of the frequency point n once when the response data packet is not successfully received once on the frequency point n. When the response data packet is not successfully received on the frequency point n for many times, the priority of the frequency point n is continuously reduced. When the priority of the frequency point n is reduced to the preset priority level G2, it can be determined that the frequency point n is currently not suitable for data transmission, and therefore the frequency point n can be removed from the bluetooth frequency point list. At this time, the number of the frequency points in the bluetooth frequency point list is less than 79. The preset priority level G2 < G1.
After the frequency point n is removed from the Bluetooth frequency point list, the number of frequency points in the Bluetooth frequency point list is reduced, and the time for traversing the Bluetooth frequency point list once is also correspondingly reduced.
In practical applications, it is known that most of the interference experienced by bluetooth devices is in the form of bandwidth. For example, a common router's interference is that of a 20MHz bandwidth. Therefore, when the interference received at a frequency point is relatively serious, the frequency point adjacent to the frequency value of the frequency point is likely to have relatively serious interference.
In the embodiment of the invention, in order to better avoid the frequency point with serious interference, when the frequency point n is removed from the Bluetooth frequency point list, the priority of at least two frequency points adjacent to the frequency value of the frequency point n in the Bluetooth frequency point list can be correspondingly reduced.
For example, when the frequency value of the frequency point n is 2450MHz, and the frequency point n is removed from the bluetooth frequency point list, the priority of the frequency point having the frequency value of 2451MHz and the priority of the frequency point having the frequency value of 2449MHz are reduced. The priority of the frequency points with the frequency values of 2451MHz, 2452MHz, 2449MHz and 2448MHz may also be reduced, and the reduction range of the priority of the frequency points with the frequency values of 2451MHz and 2449MHz may be greater than the reduction range of the priority of the frequency points with the frequency values of 2452MHz and 2448 MHz.
In the embodiment of the invention, if the response data packet sent by the opposite terminal equipment is successfully received on the frequency point m, the performance of the frequency point m can be judged to be better, and the priority of the frequency point m can be improved. If the response data packet sent by the peer end device can be successfully received on the frequency point m for multiple times, and because most of the interference exists in the form of bandwidth, when the interference of the frequency point m is small, the interference received by at least two frequency points adjacent to the frequency value of the frequency point m may also be small, and at this time, the priority of at least two frequency points adjacent to the frequency value of the frequency point m can be improved.
For example, the frequency value of the frequency point m is 2460MHz, and the response data packet sent by the peer device is successfully received for 5 consecutive times. Therefore, the priority of the bin having the frequency value of 2461MHz and the priority of the bin having the frequency value of 2459MHz can be increased. The priority of the frequency points with the frequency values of 2461MHz, 2462MHz, 2459MHz and 2458MHz can also be increased, and the priority increase of the frequency points with the frequency values of 2461MHz and 2459MHz can be greater than the priority increase of the frequency points with the frequency values of 2462MHz and 2458 MHz.
In practical application, a certain frequency point may not be always interfered more seriously, and may only be interfered more seriously in a certain time period and less interfered in other time periods. E.g. at t1～t2A router with the same frequency as 2450MHz is in a working state in a time period, and the frequency value is t2～t3The router is in a shutdown state for a period of time. That is, at t1～t2In the time period, the frequency point with the frequency value of 2450MHz is relatively seriously interfered, and at t2～t3In the time period, the interference is small.
Therefore, after a certain frequency point is removed from the Bluetooth frequency point list, when a certain condition is met, the frequency point can be added into the Bluetooth frequency point list again.
In the embodiment of the present invention, as can be known from the above, since most of the interference exists in the form of bandwidth, when serious interference exists on a frequency point, the interference existing on the frequency point having a deviation value from the frequency point greater than 10MHz may be small. After the frequency point n is removed from the bluetooth frequency point list, whether a frequency point y exists in a range where the deviation from the frequency value of the frequency point n is greater than 10MHz can be detected, and the frequency point y is a frequency point which has been removed from the bluetooth frequency point list before. And when the frequency point y exists, adding the frequency point y to the Bluetooth frequency point list, and setting the priority of the frequency point y to be a preset priority level G3, wherein G2 is more than G3 and is more than G1.
For example, when the interference is large at the frequency point with the frequency value of 2450MHz, the interference at the frequency points with the frequency values of 2402MHz to 2440MHz and 2460MHz to 2480MHz can be considered to be small. And if no frequency point y with the frequency value of 2411MHz exists in the Bluetooth frequency point list, adding the frequency point y with the frequency value of 2411MHz into the Bluetooth frequency point list, and setting the priority of the frequency point y as the priority G3.
In the embodiment of the present invention, when the priority of at least two frequency points adjacent to the frequency value of the frequency point m is increased, there may be a scene in which the frequency point z adjacent to the frequency value of the frequency point m is not in the bluetooth frequency point list, that is, the frequency point z is removed from the bluetooth frequency point list before. At this time, the frequency point z may be newly added to the bluetooth frequency point list, and the priority of the frequency point z is set to the preset priority level G4, and G2 < G4 < G1.
For example, the response data packet sent by the peer device is successfully received for 5 times continuously on the frequency point with the frequency value of 2460MHz, and the frequency point z with the frequency value of 2461MHz is not in the bluetooth frequency point list. At this time, the frequency point z may be added to the bluetooth frequency point list, and the priority of the frequency point z may be set to the priority level G4.
And step S103, selecting a frequency point with a priority higher than a preset priority G1 from the Bluetooth frequency point list as a working frequency point.
In specific implementation, when data transmission is performed, in the bluetooth frequency point list, only a frequency point with a priority higher than a preset priority level G1 may be selected as a working frequency point. The rest of the frequency points with the priority levels lower than the priority level G1 and higher than the priority level G2 can be used as the frequency points to be checked and are not used for data transmission.
In the prior art, the strength of an interference signal around a working frequency point of a bluetooth device is usually detected by calculating RSSI, but when the environment of the bluetooth device is complex, the interference on the frequency point with the selected RSSI being smaller may be larger.
In the embodiment of the present invention, when the data packet sent by the peer device is not successfully received at the frequency point n, it is determined that the performance of the frequency point n is poor and there may be large interference, so that the priority of the frequency point n is reduced. When the working frequency point is selected, the frequency point with the priority higher than a certain level is selected from the Bluetooth frequency point list for data transmission, and the frequency point which is greatly influenced by interference is eliminated, so that the frequency point with a small interference value can be selected as the working frequency point.
Referring to fig. 2, an embodiment of the present invention provides a frequency point selecting device 20 for a bluetooth device, including: a sending unit 201, an adjusting unit 202, and a selecting unit 203, wherein:
a sending unit 201, configured to send a data packet to an opposite terminal device on all frequency points in the bluetooth frequency point list;
an adjusting unit 202, configured to adjust the priority of the frequency point in the bluetooth frequency point list, and when a response data packet sent by the peer device is not successfully received at frequency point n, reduce the priority of the frequency point n;
a selecting unit 203, configured to select, from the bluetooth frequency point list, a frequency point with a priority higher than a preset priority level G1 as a working frequency point.
In a specific implementation, the frequency point selecting device 20 of the bluetooth device may further include: a removing unit 204, configured to remove the frequency point n from the bluetooth frequency point list when it is detected that the priority of the frequency point n is lower than a preset priority level G2; wherein G1 > G2.
In a specific implementation, the adjusting unit 202 may further be configured to: and reducing the priority of at least two frequency points adjacent to the frequency value of the frequency point n in the Bluetooth frequency point list.
In a specific implementation, the adjusting unit 202 may further be configured to: and when detecting that the frequency point y with the deviation of the frequency value of the frequency point n larger than 10MHz is not in the Bluetooth frequency point list, adding the frequency point y to the Bluetooth frequency point list, and setting the priority of the frequency point y to be a preset priority level G3, wherein G2 is more than G3 and more than G1.
In a specific implementation, the adjusting unit 202 may further be configured to: and when the response data packet is continuously and successfully received for multiple times on the frequency point m, the priority of at least two frequency points adjacent to the frequency value of the frequency point m in the Bluetooth frequency point list is improved.
In a specific implementation, the adjusting unit 202 may further be configured to: when detecting that the frequency point z adjacent to the frequency value of the frequency point m is not in the Bluetooth frequency point list, adding the frequency point z to the Bluetooth frequency point list, and setting the priority of the frequency point z to be a priority level G4, wherein G2 is more than G4 and is more than G1.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A frequency point selection method of Bluetooth equipment is characterized by comprising the following steps:
sending a data packet to opposite terminal equipment on all frequency points in the Bluetooth frequency point list;
adjusting the priority of the frequency points in the Bluetooth frequency point list, including: when a response data packet sent by the opposite terminal equipment is not successfully received on the frequency point n, the priority of the frequency point n is reduced, and the priority of at least two frequency points adjacent to the frequency value of the frequency point n in the Bluetooth frequency point list is reduced;
selecting a frequency point with a priority higher than a preset priority G1 from the Bluetooth frequency point list as a working frequency point;
when the response data packet is continuously and successfully received for multiple times on the frequency point m, the priority of at least two frequency points adjacent to the frequency value of the frequency point m in the Bluetooth frequency point list is improved; when detecting that the frequency point z adjacent to the frequency value of the frequency point m is not in the Bluetooth frequency point list, adding the frequency point z to the Bluetooth frequency point list, and setting the priority of the frequency point z to be a priority level G4, wherein G2 is more than G4 is more than G1, and G2 is a preset priority level.
2. The method for selecting the frequency point of the bluetooth device according to claim 1, further comprising: when the priority of the frequency point n is lower than a preset priority level G2, removing the frequency point n from the Bluetooth frequency point list; wherein G2 is less than G1.
3. The method for selecting the frequency point of the bluetooth device according to claim 1, further comprising: and when detecting that the frequency point y with the deviation of the frequency value of the frequency point n larger than 10MHz is not in the Bluetooth frequency point list, adding the frequency point y to the Bluetooth frequency point list, and setting the priority of the frequency point y to be a preset priority level G3, wherein G2 is more than G3 and more than G1.
4. The utility model provides a device is selected to frequency point of bluetooth equipment which characterized in that includes:
the transmitting unit is used for transmitting a data packet to the opposite terminal equipment on all frequency points in the Bluetooth frequency point list;
the adjusting unit is used for adjusting the priority of the frequency points in the Bluetooth frequency point list, and when a response data packet sent by the opposite terminal equipment is not successfully received on the frequency point n, the priority of the frequency point n is reduced, and the priority of at least two frequency points adjacent to the frequency value of the frequency point n in the Bluetooth frequency point list is reduced;
the selecting unit is used for selecting a frequency point with a priority higher than a preset priority level G1 from the Bluetooth frequency point list as a working frequency point;
the adjustment unit is further configured to: when the response data packet is continuously and successfully received for multiple times on the frequency point m, the priority of at least two frequency points adjacent to the frequency value of the frequency point m in the Bluetooth frequency point list is improved; when detecting that the frequency point z adjacent to the frequency value of the frequency point m is not in the Bluetooth frequency point list, adding the frequency point z to the Bluetooth frequency point list, and setting the priority of the frequency point z to be a priority level G4, wherein G2 is more than G4 and is more than G1.
5. The apparatus for selecting frequency points of bluetooth device as claimed in claim 4, further comprising: the removing unit is used for removing the frequency point n from the Bluetooth frequency point list when the priority of the frequency point n is lower than the preset priority G2; wherein G1 > G2.
6. The apparatus for selecting frequency points of bluetooth device according to claim 4, wherein the adjusting unit is further configured to: and when detecting that the frequency point y with the deviation of the frequency value of the frequency point n larger than 10MHz is not in the Bluetooth frequency point list, adding the frequency point y to the Bluetooth frequency point list, and setting the priority of the frequency point y to be a preset priority level G3, wherein G2 is more than G3 and more than G1.
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