CN110351795B - Frequency point switching method, device, storage medium and wireless equipment - Google Patents
Frequency point switching method, device, storage medium and wireless equipment Download PDFInfo
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- CN110351795B CN110351795B CN201810306992.9A CN201810306992A CN110351795B CN 110351795 B CN110351795 B CN 110351795B CN 201810306992 A CN201810306992 A CN 201810306992A CN 110351795 B CN110351795 B CN 110351795B
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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
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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
- H04W36/20—Performing reselection for specific purposes for optimising the interference level
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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
Abstract
The present disclosure relates to a frequency point switching method, apparatus, storage medium, and wireless device, to accurately perform frequency point switching to avoid interference and effectively reduce the occurrence of false switching. The frequency point switching method comprises the following steps: determining parameter values of an electromagnetic environment where the two transceiving ends are currently co-located, wherein the parameter values at least comprise: actual SNR and actual P of received power at the receiving endr(ii) a Determining a theoretical value of received power in a non-interference environment at the current actual distance between the transmitting end and the receiving end
And signal-to-noise ratio theoretical value under interference-free environment
At the signal-to-noise ratio theoretical value
The difference value with the actual SNR value exceeds the allowable SNR error range ScAnd the theoretical value of the received power
And the actual value of received power PrWithin the allowable range of received power error PcAnd when the frequency point is switched, triggering frequency point switching so as to synchronously switch the working frequency points at the receiving and transmitting ends to the target frequency point.
Description
Technical Field
The present disclosure relates to the field of wireless communication technologies, and in particular, to a frequency point switching method, apparatus, storage medium, and wireless device.
Background
The ISM (industrial Scientific medical) frequency band, also called unlicensed frequency band, is used without authorization of radio management committee, and the variety of wireless devices operating in the frequency band is large, resulting in a plurality of interference sources in the ISM frequency band which are difficult to predict. Therefore, the interference rejection becomes one of the important indicators for measuring the performance of the wireless device operating in the ISM band.
At present, most of wireless devices operating in ISM frequency band operate in a fixed operating frequency point mode, that is, manufacturers have set the operating frequency point to a certain fixed value when the devices leave factory, and do not consider the diversity and time-varying property of the electromagnetic environment in which the wireless devices operate.
When the geographic position of the wireless device moves, the interference situation of the electromagnetic environment where the wireless device is located is often very different, and for the wireless device working at a fixed frequency point, it is difficult to ensure that the wireless device has the same anti-interference performance at different geographic positions, resulting in the reduction of the communication reliability and stability of the wireless device. If the working frequency point is changed manually or set in an off-line mode by a user, the continuity, stability and reliability of data transmission of the wireless equipment are affected.
Disclosure of Invention
An object of the present disclosure is to provide a frequency point switching method, apparatus, storage medium, and wireless device, which can accurately perform frequency point switching to avoid interference and effectively reduce the occurrence of false switching.
In order to achieve the above object, a first aspect of the present disclosure provides a frequency point switching method, applied to a receiving end or a transmitting end of two receiving and transmitting ends, the method including:
determining parameter values of an electromagnetic environment where the two transceiving ends are currently co-located, wherein the parameter values at least comprise: actual SNR and actual P of received power at the receiving endr；
Determining a theoretical value of received power in a non-interference environment at the current actual distance between the transmitting end and the receiving end
And signal-to-noise ratio theoretical value under interference-free environment
At the signal-to-noise ratio theoretical value
The difference value with the actual SNR value exceeds the allowable SNR error range ScAnd the theoretical value of the received power
And the actual value of received power PrWithin the allowable range of received power error PcAnd when the frequency point is switched, triggering frequency point switching so as to synchronously switch the working frequency points at the receiving and transmitting ends to the target frequency point.
Optionally, the triggering frequency point switching includes:
sending or receiving a frequency point switching request, wherein the frequency point switching request comprises an identifier of the target frequency point and a parameter value of a switching time point;
the method further comprises the following steps:
determining a switching time point according to the parameter value of the switching time point;
and at the switching time point, switching the working frequency point to the target frequency point according to the identification of the target frequency point.
Optionally, after receiving the frequency point switching request, the method further includes:
analyzing the identifier of the target frequency point and the parameter value of the switching time point, which are included in the frequency point switching request;
sending a first confirmation data packet, wherein the first confirmation data packet is used for confirming that the frequency point switching request is received and analyzed;
receiving a second confirmation data packet, wherein the second confirmation data packet is used for confirming that the working frequency point starts to be switched;
determining a switching time point according to the parameter value of the switching time point, comprising:
determining a first time point t for receiving and analyzing the frequency point switching request1And a second time t at which the second acknowledgment packet is received and parsed3；
According to the first time point t1The second time point t3And a fixed time interval T, determining a switching time point as
Optionally, the method further comprises:
detecting whether the second acknowledgement packet is received before the switching time point;
and if the second confirmation data packet is not received at the switching time point, terminating the switching of the working frequency point.
Optionally, after sending the frequency point switching request, the method further includes:
receiving a first confirmation data packet, wherein the first confirmation data packet is used for confirming that the frequency point switching request is received and analyzed;
sending a second confirmation data packet, wherein the second confirmation data packet is used for confirming the start of switching the working frequency points;
determining a switching time point according to the parameter value of the switching time point, comprising:
determining a third time point t 'at which the first acknowledgement data packet is received and parsed'2；
According to the third time point t'2And a fixed time interval T, and determining that the switching time point is T + T'2。
Optionally, the method further comprises:
detecting whether the first acknowledgement packet is received before the switching time point;
and if the first confirmation data packet is not received at the switching time point, terminating the switching of the working frequency points.
Optionally, a theoretical value of the received power in a non-interference environment at the current actual distance between the two transmitting and receiving ends is determined
And signal-to-noise ratio theoretical value under interference-free environment
The method comprises the following steps:
determining the theoretical value of the received power according to the following formula
Determining the theoretical value of the signal-to-noise ratio according to the following formula
Wherein G istRepresenting the antenna gain, G, of the transmitting endrDenotes the antenna gain of the receiving end, λ is a fixed value and denotes the wavelength, PtRepresenting the actual value of the transmitting power of the transmitting terminal, l representing the current actual distance between the transmitting terminal and the receiving terminal, fnRepresenting the power spectral density of the thermal noise, B representing the bandwidth of the radio frequency system, and G being the gain of the radio frequency system to the noise.
Optionally, the method further comprises:
adding the observed values of the electromagnetic environment acquired for multiple times in the history into a ring queue with a preset length according to the acquisition sequence;
determining an average value of the remaining values in the circular queue except the minimum value;
determining a parameter value of an electromagnetic environment where the transmitting end and the receiving end are currently located, including:
comparing the average value with an observed value which is collected in the circular queue at the last time;
and determining the larger of the average value and the observation value collected last time in the circular queue as the parameter value.
The second aspect of the present disclosure provides a frequency point switching device, which is applied to a receiving end or a transmitting end in two receiving and transmitting ends, and the device includes:
a first determining module, configured to determine a parameter value of an electromagnetic environment where the transceiver is currently located, where the parameter value at least includes: actual SNR and actual P of received power at the receiving endr；
A second determining module for determining the theoretical value of the received power under the interference-free environment under the current actual distance between the two terminals
And signal-to-noise ratio theoretical value under interference-free environment
A trigger module for triggering the theoretical value of the signal-to-noise ratio
The difference value with the actual SNR value exceeds the allowable SNR error range ScAnd the theoretical value of the received power
And the actual value of received power PrWithin the allowable range of received power error PcAnd when the frequency point is switched, triggering frequency point switching so as to synchronously switch the working frequency points at the receiving and transmitting ends to the target frequency point.
Optionally, the triggering module includes:
the sending and receiving submodule is used for sending or receiving a frequency point switching request, and the frequency point switching request comprises the identification of the target frequency point and the parameter value of the switching time point;
the device further comprises:
the third determining module is used for determining the switching time point according to the parameter value of the switching time point;
and the switching module is used for switching the working frequency point to the target frequency point at the switching time point according to the identification of the target frequency point.
Optionally, the apparatus further comprises:
the analysis module is used for analyzing the identifier of the target frequency point and the parameter value of the switching time point, which are included in the frequency point switching request;
a first sending module, configured to send a first acknowledgement packet, where the first acknowledgement packet is used to confirm that the frequency point switching request has been received and analyzed;
the first receiving module is used for receiving a second confirmation data packet, and the second confirmation data packet is used for confirming the start of switching the working frequency point;
the third determining module includes:
a first determining submodule for determining a first time point t at which the frequency point switching request is received and analyzed1And a second time t at which the second acknowledgment packet is received and parsed3；
A second determining submodule for determining the first time point t1The second time point t3And a fixed time interval T, determining a switching time point as
Optionally, the apparatus further comprises:
a first detecting module, configured to detect whether the second acknowledgment packet is received before the switching time point;
and the first termination module is used for terminating the switching of the working frequency points if the second confirmation data packet is not received at the switching time point.
Optionally, the apparatus further comprises:
a second receiving module, configured to receive a first acknowledgement packet, where the first acknowledgement packet is used to confirm that the frequency point switching request has been received and analyzed;
the second sending module is used for sending a second confirmation data packet, and the second confirmation data packet is used for confirming the start of switching the working frequency points;
the third determining module includes:
a third determining submodule, configured to determine a third time point t 'at which the first acknowledgement packet is received and analyzed'2；
A fourth determining submodule for determining according to the third time point t'2And a fixed time interval T, and determining that the switching time point is T + T'2。
Optionally, the apparatus further comprises:
a second detecting module, configured to detect whether the first acknowledgment packet is received before the switching time point;
and the second termination module is used for terminating the switching of the working frequency points if the first confirmation data packet is not received at the switching time point.
Optionally, the second determining module is configured to:
determining the theoretical value of the received power according to the following formula
Determining the theoretical value of the signal-to-noise ratio according to the following formula
Wherein G istRepresenting the antenna gain, G, of the transmitting endrDenotes the antenna gain of the receiving end, λ is a fixed value and denotes the wavelength, PtRepresenting the actual value of the transmitting power of the transmitting terminal, l representing the current actual distance between the transmitting terminal and the receiving terminal, fnPower spectral density representing thermal noise, B representing bandwidth of radio frequency system, and G representing noise of radio frequency systemThe gain of (c).
Optionally, the apparatus further comprises:
the adding module is used for adding the observed values of the electromagnetic environment acquired for multiple times in history into a queue with a preset length according to the acquisition sequence;
a fourth determining module, configured to determine an average of remaining values in the queue except for the minimum value;
the first determining module includes:
a comparison submodule for comparing the average value with the observation value collected most recently in the queue;
a fifth determining submodule, configured to determine, as the parameter value, the larger of the average value and the observation value that is collected last time in the queue.
A third aspect of the present disclosure provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect of the present disclosure.
A fourth aspect of the present disclosure provides a wireless device, comprising:
a computer-readable storage medium as set forth in the third aspect of the disclosure; and
one or more processors to execute the computer program in the computer-readable storage medium.
By the technical scheme, the receiving power theoretical value and the signal-to-noise ratio theoretical value of the receiving and transmitting ends in the current actual distance and in the interference-free environment are determined, the receiving power theoretical value and the signal-to-noise ratio theoretical value are used as thresholds and are respectively compared with the receiving power actual value and the signal-to-noise ratio actual value obtained by current measurement, and then whether frequency point switching is triggered or not is determined. Because the receiving power theoretical value and the signal-to-noise ratio theoretical value are both determined under the current actual distance of the receiving and transmitting ends, the threshold in the embodiment of the disclosure is relative to the current actual distance of the receiving and transmitting ends, and is influenced by the current actual distance of the receiving and transmitting ends, so that the threshold is prevented from being fixed in the related technology, and the actual value is smaller than the threshold only due to the increase of the current actual distance of the receiving and transmitting ends, thereby causing the false switching.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart of a frequency point switching method according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of filtering an observation value acquired in real time in the embodiment of the present disclosure.
Fig. 3A is a schematic diagram of implementing a filtering process based on a circular queue in an embodiment of the present disclosure.
Fig. 3B is another schematic diagram of implementing a filtering process based on a circular queue in an embodiment of the present disclosure.
Fig. 3C is another schematic diagram of implementing the filtering process based on the circular queue in the embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a direct path model in an embodiment of the disclosure.
Fig. 5 is a schematic diagram of performing frequency point switching at both transmitting and receiving ends in the embodiment of the present disclosure.
Fig. 6 is a schematic diagram of a frequency point switching device according to an embodiment of the present disclosure.
Fig. 7 is a schematic diagram of a wireless device provided by an embodiment of the disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The embodiment of the disclosure provides a frequency point switching method for diversity and time-varying property of electromagnetic environments faced by wireless equipment working in an ISM frequency band, and the method can effectively improve the anti-interference performance of the wireless equipment in different electromagnetic environments and ensure the continuity, stability and reliability of data transmission of the wireless equipment.
The frequency point switching method provided by the embodiment of the disclosure is applied to a receiving end or a transmitting end of two transmitting and receiving ends, both the two transmitting and receiving ends are wireless devices, and the method can be executed by the receiving end and the transmitting end. The receiving end and the transmitting end are interchanged, and the feasibility of the frequency point switching method provided by the embodiment of the disclosure is not affected.
Fig. 1 is a flowchart of a frequency point switching method according to an embodiment of the present disclosure. As shown in fig. 1, the method comprises the steps of:
step S11: determining parameter values of an electromagnetic environment where the two transceiving ends are currently co-located, wherein the parameter values at least comprise: actual SNR and actual P of received power at the receiving endr；
Step S12: determining a theoretical value of received power in a non-interference environment at the current actual distance between the transmitting end and the receiving end
And signal-to-noise ratio theoretical value under interference-free environment
Step S13: at the signal-to-noise ratio theoretical value
The difference value with the actual SNR value exceeds the allowable SNR error range ScAnd the theoretical value of the received power
And the actual value of received power PrWithin the allowable range of received power error PcAnd when the frequency point is switched, triggering frequency point switching so as to switch the working frequency points at the receiving and transmitting ends to the target frequency point.
In order to always keep the anti-interference performance of the wireless equipment optimal, the wireless equipment needs to sense the electromagnetic environment around the wireless equipment in real time, and automatically switch working frequency points when the interference in the electromagnetic environment is strong. In order to ensure the continuity, stability and reliability of data transmission performed by the two transmitting and receiving ends, the two transmitting and receiving ends need to synchronously switch working frequency points, so that the receiving end or the transmitting end needs to sense the electromagnetic environment where the two transmitting and receiving ends are located in common in real time and determine the parameter value of the electromagnetic environment where the two transmitting and receiving ends are located in common at present so as to determine the interference condition in the electromagnetic environment where the two transmitting and receiving ends are located in common at present.
The parameter value of the electromagnetic environment where the two transmitting and receiving ends are currently located is determined, and the method includes the following two implementation modes:
the first embodiment is as follows: and taking the observation value of the electromagnetic environment collected at present as a parameter value of the electromagnetic environment where the two receiving and transmitting ends are located at present.
The second embodiment comprises the following steps:
adding the observed values of the electromagnetic environment acquired for multiple times in the history into a ring queue with a preset length according to the acquisition sequence;
determining an average value of the remaining values in the circular queue except the minimum value;
comparing the average value with an observed value which is collected in the circular queue at the last time;
and determining the larger of the average value and the observation value collected last time in the circular queue as the parameter value.
In the embodiment of the disclosure, the observed value acquired in real time can be used as a parameter value for judging whether to trigger frequency point switching. In addition, in the embodiment of the present disclosure, the complex variability of the electromagnetic environment of the ISM frequency band is also considered, and due to the influence of movement, shielding or a natural environment, the observation value may be severely jittered (that is, the observation value is rapidly recovered after being sharply reduced), if the observation value is directly used as a parameter value for judging whether to trigger the frequency point switching, the receiving end or the transmitting end may be caused to frequently switch the working frequency point, so that the continuity, stability and reliability of data transmission between the receiving end and the transmitting end are inevitably reduced. Therefore, in the embodiment of the present disclosure, the observation value acquired in real time may also be subjected to filtering processing, and the observation value after filtering processing is used as a parameter value for determining whether to trigger frequency point switching.
One possible filtering process is: averaging a plurality of observation values acquired in a period of electromagnetic environment history where a receiving end and a transmitting end are co-located to obtain an average value of residual values except for a minimum value, and then taking the larger of the average value and the observation value acquired in real time as an output value to more accurately reflect the continuous or periodic interference of the electromagnetic environment where the receiving end and the transmitting end are co-located to a specific frequency point or a specific frequency band on a long time scale, so as to more accurately determine whether the working frequency point switching should be triggered.
Fig. 2 is a schematic diagram of filtering an observation value acquired in real time in the embodiment of the present disclosure. As shown in fig. 2, a circular queue is used to filter observations collected multiple times in the history. Illustratively, the length of the ring queue is set to 15, and when the number of elements in the ring queue is more than 15, the observed value measured later will cover the observed value measured earlier, which is equivalent to that the ring queue can record and count the 15 observed values measured historically. The observed values measured later are filled into the positions pointed by the tail pointers in the circular queue, and the tail pointers move one bit along the filling direction after each observed value is processed. After the observation value (i.e. input value) collected at the last time is queued, traversing all elements in the range from the head pointer to the tail pointer in the circular queue along the filling direction, calculating the average value of the other elements in the queue except the minimum element, then comparing the calculated average value with the input value, and taking the larger of the average value and the input value as an output value, that is, taking the output value as a parameter value for judging whether to trigger frequency point switching.
The following describes a procedure for implementing the filtering process based on the circular queue with a set of example data. Fig. 3A is a schematic diagram of implementing a filtering process based on a circular queue in an embodiment of the present disclosure. As shown in FIG. 3A, an observation of a jump of 10 is inserted at the tail pointer of the circular ring queue, and since the value of 10 is the minimum of all elements in the circular queue, it will not be counted in calculating the average of all elements. Therefore, the statistical average value calculated is 20, the average value is larger than the input value, and thus the output value is 20. Through filtering processing, the influence of the jump value of 10 on the output value is successfully filtered, and the condition that the observed value is suddenly reduced can be effectively smoothed, so that the sudden change condition is avoided.
Similarly, fig. 3B is another schematic diagram of implementing the filtering process based on the circular queue in the embodiment of the present disclosure. As shown in fig. 3B, even when the observation value suddenly increases, smoothing can be effectively performed by filtering processing, and occurrence of sudden change can be avoided. Fig. 3C is another schematic diagram of implementing the filtering process based on the circular queue in the embodiment of the present disclosure. As shown in fig. 3C, for the case that the observed value is continuously decreased for a period of time, the output value obtained through the filtering process can quickly reflect that the interference in the electromagnetic environment where the receiving end and the transmitting end are located is strong.
In the embodiment of the disclosure, the interference condition in the electromagnetic environment where the receiving end and the transmitting end are co-located can be measured by the parameter value of the electromagnetic environment where the receiving end and the transmitting end are currently co-located. The parameter values include at least: actual SNR and actual P of received power at receiving endr。
Where SNR reflects the relative magnitude of the received power versus the noise power and the interference power. When the transmitting power is constant, the receiving power is inversely proportional to the square of the current actual distance between the two ends of the transceiver, i.e. the larger the current actual distance between the two ends of the transceiver, the smaller the receiving power. It can be seen that even though the noise power and the interference power are not changed, the SNR is degraded when the current actual distance between the two ends of the transceiver is increased. Therefore, when determining whether to trigger the switching of the working frequency point, the SNR and the connection should be considered comprehensively
Receiving power and the current actual distance between the two ends of the receiving and transmitting. The SNR, the received power, and the current actual distance between both the transmitting and receiving ends will be described below.
1) Current actual distance between transmitting and receiving ends
In the disclosed embodiment, the height h is set at the transmitting endtMuch greater than the receiving end height hrIn this case, the electromagnetic environment where the two ends of the transceiver are currently located can be equivalent to a direct-view model. FIG. 4 is an embodiment of the disclosureSchematic diagram of the direct path model of (1). As shown in FIG. 4, the current actual distance l between the transmitter and the receiver is determined by the horizontal distance d between the transmitter and the receiver and the flying height h of the transmittertDetermined, receiving end height hrCan be ignored. Thus, the current actual distance l between the transmitting end and the receiving end conforms to the formula (1):
2) received power
In a possible embodiment, the theoretical value of the received power in a non-interference environment at the current actual distance between the two transceivers is determined according to equation (2)
3)SNR
In a possible embodiment, the theoretical value of the signal-to-noise ratio in a non-interference environment at the current actual distance between the transmitting and receiving ends is determined according to equation (3)
Wherein G istRepresenting the antenna gain, G, of the transmitting endrDenotes the antenna gain of the receiving end, λ is a fixed value and denotes the wavelength, PtRepresenting the actual value of the transmitting power of the transmitting terminal, l representing the current actual distance between the transmitting terminal and the receiving terminal, fnRepresenting the power spectral density of the thermal noise, B representing the bandwidth of the radio frequency system, and G being the gain of the radio frequency system to the noise.
In the embodiment of the present disclosure, the condition for triggering frequency point switching conforms to formula (4):
wherein S iscFor allowable range of signal-to-noise ratio error, PcBoth are constant for the received power error tolerance. Adopting the formula (4), under the current actual distance between the transmitting end and the receiving end, if the theoretical value of the received power is
And the actual value of received power PrWithin the allowable range of received power error PcInternal, but signal-to-noise ratio theoretical value
The difference value with the actual SNR value exceeds the allowable S range of SNR errorcAnd then, considering that the interference with the strength enough to influence the data transmission quality exists in the electromagnetic environment where the transmitting end and the receiving end are currently located, and triggering the switching of the working frequency points.
By adopting the technical scheme, the receiving power theoretical value and the signal-to-noise ratio theoretical value of the receiving and transmitting ends in the current actual distance and in the interference-free environment are determined, the receiving power theoretical value and the signal-to-noise ratio theoretical value are used as thresholds and are respectively compared with the receiving power actual value and the signal-to-noise ratio actual value obtained by current measurement, and then whether frequency point switching is triggered or not is determined. Because the receiving power theoretical value and the signal-to-noise ratio theoretical value are both determined under the current actual distance of the receiving and transmitting ends, the threshold in the embodiment of the disclosure is relative to the current actual distance of the receiving and transmitting ends, and is influenced by the current actual distance of the receiving and transmitting ends, so that the threshold is prevented from being fixed in the related technology, and the actual value is smaller than the threshold only due to the increase of the current actual distance of the receiving and transmitting ends, thereby causing the false switching.
In a possible implementation manner, triggering frequency point switching includes:
sending or receiving a frequency point switching request, wherein the frequency point switching request comprises an identifier of the target frequency point and a parameter value of a switching time point;
the method further comprises the following steps:
determining a switching time point according to the parameter value of the switching time point;
and at the switching time point, switching the working frequency point to the target frequency point according to the identification of the target frequency point.
For one end receiving the frequency point switching request, after receiving the frequency point switching request, the method further includes: analyzing the identifier of the target frequency point and the parameter value of the switching time point, which are included in the frequency point switching request; sending a first confirmation data packet, wherein the first confirmation data packet is used for confirming that the frequency point switching request is received and analyzed; and receiving a second confirmation data packet, wherein the second confirmation data packet is used for confirming the start of switching the working frequency points.
In one embodiment, for an end receiving a frequency point switching request, the method further includes:
detecting whether the second acknowledgement packet is received before the switching time point; and if the second confirmation data packet is not received at the switching time point, terminating the switching of the working frequency point.
For one end sending the frequency point switching request, after sending the frequency point switching request, the method further comprises: receiving a first confirmation data packet, wherein the first confirmation data packet is used for confirming that the frequency point switching request is received and analyzed; and sending a second confirmation data packet, wherein the second confirmation data packet is used for confirming the start of switching the working frequency points.
In an embodiment, for an end sending a frequency point switching request, the method further includes:
detecting whether the first acknowledgement packet is received before the switching time point; and if the first confirmation data packet is not received at the switching time point, terminating the switching of the working frequency points.
In the embodiment of the present disclosure, the execution main body for triggering the frequency point switching may be a transmitting end or a receiving end. If the transmitting terminal executes the trigger frequency point switching, the transmitting terminal determines the identification of the target frequency point and the parameter value of the switching time point, and then sends a frequency point switching request to the receiving terminal. Correspondingly, the receiving end receives the frequency point switching request sent by the transmitting end. Then, the transmitting end and the receiving end respectively determine a switching time point according to the parameter value of the switching time point, and when the time point to be switched comes, the working frequency point is respectively switched to the target frequency point according to the identification of the target frequency point. The process of the receiving end executing the trigger frequency point switching is similar, and is not described herein again.
Exemplarily, fig. 5 is a schematic diagram of performing frequency point switching at both transmitting and receiving ends in the embodiment of the present disclosure. Fig. 5 takes the a terminal as the receiving terminal and the B terminal as the transmitting terminal (this assumption is only for convenience of explanation, and the exchange of the two transmitting and receiving terminals does not affect the feasibility of the scheme proposed by the embodiment of the present disclosure).
The interference condition addressed by the embodiments of the present disclosure is persistent or periodic interference on a long time scale (much larger than a millisecond magnitude) for a specific frequency point or a specific frequency band, and therefore, transmission delays of a first acknowledgement data packet (ACK) and a second acknowledgement data packet (ACK) on a link are equal and may be denoted as Tack. As shown in fig. 5, includes TackThe meanings of the other parameters in FIG. 5 are shown in Table 1.
TABLE 1 meanings of the individual parameters in FIG. 5
| t0 | Time point for B terminal to send work frequency point switching request |
| t1 | Time point when A end should receive frequency point switching request sent by B end |
| t2 | Time point of receiving first acknowledgement data packet sent by A end by B end |
| t3 | Time point of receiving second acknowledgement data packet of B terminal by A terminal |
| t4 | Time point of occurrence of work frequency point switching |
| trst | Time point t calculated by A terminal3Distance frequency point switching time point t4Time interval of |
| Tack | Transmission delay of first or second acknowledgement data packet in network |
| T | Set fixed time interval |
| Tr | Time consumed by the A terminal or the B terminal for receiving and analyzing the data packet |
| Tt | Time consumed by the A-side or B-side to encapsulate and send data packets |
As shown in fig. 5, when it is determined by the B-side that there is strong interference in the electromagnetic environment where the AB two ends are currently located, the switched target frequency point is preferably selected according to the real-time measurement result of the B-side on the interference condition of other frequency points in the working frequency band, and a frequency point switching Request (Request) is initiated to the a-side, where the Request includes the identifier of the target frequency point and the parameter value of the switching time point.
After receiving a switching Request (Request) sent by a terminal B, a terminal A sends a first acknowledgement data packet (ACK) to inform the terminal B, confirms that the switching Request is received, and analyzes the identifier of a target frequency point and the parameter value of a switching time point contained in the switching Request. After receiving the first acknowledgement data packet (ACK) sent by the a-side, the B-side needs to notify the a-side by sending a second acknowledgement data packet (ACK) to the a-side again, which indicates that the B-side has received the first acknowledgement data packet and can start to switch frequency points. And after receiving a second acknowledgement data packet (ACK) sent by the B terminal, the A terminal prepares to start switching the frequency point.
The receiving and sending ends can determine that both the receiving and sending ends have correctly obtained the identifier of the switched target frequency point and the parameter value of the switching time point through the three-way handshake process, and can normally perform the switching operation of the working frequency point. When any party is abnormal, the three-way handshake process cannot be completed correctly, the switching of the working frequency points is stopped, the receiving and transmitting ends can still be connected on the existing working frequency points and perform data transmission, and the serious consequence that the data transmission is disconnected due to the fact that the receiving and transmitting ends are switched to different frequency points due to the failure of transmitting or receiving of the switching request can be effectively avoided.
In the embodiment of the present disclosure, determining a switching time point according to a parameter value of the switching time point for an end receiving a frequency point switching request includes:
determining a first time point t for receiving and analyzing the frequency point switching request1And a second time t at which the second acknowledgment packet is received and parsed3；
According to the first time point t1The second time point t3And a fixed time interval T, determining a switching time point as
In the embodiment of the present disclosure, for an end that sends a frequency point switching request, determining a switching time point according to a parameter value of the switching time point includes:
determine receipt andanalyzing a third time point t 'of the first confirmation data packet'2；
According to the third time point t'2And a fixed time interval T, and determining that the switching time point is T + T'2。
Thus, for the A-side, the switching time point
For the B terminal, the time point t 'is switched'4＝T+t'2. It can be seen that the working frequency point switches the time point t4(t'4) Only with the known time t1、t3、t'2And a fixed time interval T. Therefore, the time point of the switching can be accurately determined by the two transmitting and receiving ends through calculation, the two transmitting and receiving ends can be switched to the same frequency point at the same time point to continue data transmission, and the continuity, stability and reliability of data transmission are guaranteed.
Based on the same inventive concept, the embodiment of the present disclosure further provides a frequency point switching device, which is applied to a receiving end or a transmitting end of the receiving end or the transmitting end. Fig. 6 is a schematic diagram of a frequency point switching device according to an embodiment of the present disclosure. As shown in fig. 6, the apparatus includes:
a first determining module 601, configured to determine a parameter value of an electromagnetic environment where the two transceiving ends are currently located, where the parameter value includes at least: actual SNR and actual P of received power at the receiving endr；
A second determining module 602, configured to determine a theoretical value of received power in a non-interference environment at a current actual distance between the two terminals
And signal-to-noise ratio theoretical value under interference-free environment
A trigger module 603 for setting the theoretical value of the signal-to-noise ratio
The difference value with the actual SNR value exceeds the allowable SNR error range ScAnd the theoretical value of the received power
And the actual value of received power PrWithin the allowable range of received power error PcAnd when the frequency point is switched, triggering frequency point switching so as to synchronously switch the working frequency points at the receiving and transmitting ends to the target frequency point.
Optionally, the triggering module includes:
the sending and receiving submodule is used for sending or receiving a frequency point switching request, and the frequency point switching request comprises the identification of the target frequency point and the parameter value of the switching time point;
the device further comprises:
the third determining module is used for determining the switching time point according to the parameter value of the switching time point;
and the switching module is used for switching the working frequency point to the target frequency point at the switching time point according to the identification of the target frequency point.
Optionally, the apparatus further comprises:
the analysis module is used for analyzing the identifier of the target frequency point and the parameter value of the switching time point, which are included in the frequency point switching request;
a first sending module, configured to send a first acknowledgement packet, where the first acknowledgement packet is used to confirm that the frequency point switching request has been received and analyzed;
the first receiving module is used for receiving a second confirmation data packet, and the second confirmation data packet is used for confirming the start of switching the working frequency point;
the third determining module includes:
a first determining submodule for determining a first time point t at which the frequency point switching request is received and analyzed1And a second time t at which the second acknowledgment packet is received and parsed3；
Second determining submoduleA block for determining a first time t1The second time point t3And a fixed time interval T, determining a switching time point as
Optionally, the apparatus further comprises:
a first detecting module, configured to detect whether the second acknowledgment packet is received before the switching time point;
and the first termination module is used for terminating the switching of the working frequency points if the second confirmation data packet is not received at the switching time point.
Optionally, the apparatus further comprises:
a second receiving module, configured to receive a first acknowledgement packet, where the first acknowledgement packet is used to confirm that the frequency point switching request has been received and analyzed;
the second sending module is used for sending a second confirmation data packet, and the second confirmation data packet is used for confirming the start of switching the working frequency points;
the third determining module includes:
a third determining submodule, configured to determine a third time point t 'at which the first acknowledgement packet is received and analyzed'2；
A fourth determining submodule for determining according to the third time point t'2And a fixed time interval T, and determining that the switching time point is T + T'2。
Optionally, the apparatus further comprises:
a second detecting module, configured to detect whether the first acknowledgment packet is received before the switching time point;
and the second termination module is used for terminating the switching of the working frequency points if the first confirmation data packet is not received at the switching time point.
Optionally, the second determining module is configured to:
determining the theoretical value of the received power according to the following formula
Determining the theoretical value of the signal-to-noise ratio according to the following formula
Wherein G istRepresenting the antenna gain, G, of the transmitting endrDenotes the antenna gain of the receiving end, λ is a fixed value and denotes the wavelength, PtRepresenting the actual value of the transmitting power of the transmitting terminal, l representing the current actual distance between the transmitting terminal and the receiving terminal, fnRepresenting the power spectral density of the thermal noise, B representing the bandwidth of the radio frequency system, and G being the gain of the radio frequency system to the noise.
Optionally, the apparatus further comprises:
the adding module is used for adding the observed values of the electromagnetic environment acquired for multiple times in history into a ring queue with a preset length according to the acquisition sequence;
a fourth determining module, configured to determine an average of remaining values in the circular queue except for the minimum value;
the first determining module includes:
the comparison submodule is used for comparing the average value with the observation value which is collected in the annular queue at the last time;
and the fifth determination submodule is used for determining the larger one of the average value and the observation value collected last time in the circular queue as the parameter value.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 7 is a schematic diagram illustrating a wireless device according to an example embodiment. As shown in fig. 7, the wireless device may include: a processor 1401, and a memory 1402. The wireless device may also include one or more of a multimedia component 1403, an input/output (I/O) interface 1404, and a communications component 1405.
The processor 1401 is configured to control the overall operation of the controlled device, so as to complete all or part of the steps in the method shown in fig. 1. Memory 1402 is used to store various types of data to support operation at the wireless device, such as instructions for any application or method operating on the wireless device, as well as application-related data, such as contact data, transceived messages, pictures, audio, video, and the like. The Memory 1402 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk. Multimedia components 1403 may include screen and audio components. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 1402 or transmitted through the communication component 1405. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 1404 provides an interface between the processor 1401 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 1405 is used for wired or wireless communication between the wireless device and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, or 4G, or a combination of one or more of them, so that the corresponding Communication component 1405 can include: Wi-Fi module, bluetooth module, NFC module.
In an exemplary embodiment, the wireless Device may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components, and the wireless Device is configured to perform the method of fig. 1.
In another exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the method shown in fig. 1 described above is also provided. For example, the computer readable storage medium may be the above-mentioned memory 1402 comprising program instructions executable by the processor 1401 of the controlled device to perform the above-mentioned method of fig. 1.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (11)
1. A frequency point switching method is applied to a receiving end or a transmitting end of a transmitting end and a receiving end, and comprises the following steps:
determining parameter values of an electromagnetic environment where the two transceiving ends are currently co-located, wherein the parameter values at least comprise: actual SNR and actual P of received power at the receiving endr；
Determining a theoretical value of received power in a non-interference environment at the current actual distance between the transmitting end and the receiving end
And signal-to-noise ratio theoretical value under interference-free environment
At the signal-to-noise ratio theoretical value
The difference value with the actual SNR value exceeds the allowable SNR error range ScAnd the theoretical value of the received power
And the actual value of received power PrWithin the allowable range of received power error PcWhen the frequency point switching is performed, the receiving end triggers the frequency point switching, or the transmitting end triggers the frequency point switching, so that the working frequency points at the receiving end and the transmitting end are synchronously switched to the target frequency point.
2. The method according to claim 1, wherein the triggering the frequency point switching comprises:
sending or receiving a frequency point switching request, wherein the frequency point switching request comprises an identifier of the target frequency point and a parameter value of a switching time point;
the method further comprises the following steps:
determining a switching time point according to the parameter value of the switching time point;
and at the switching time point, switching the working frequency point to the target frequency point according to the identification of the target frequency point.
3. The method according to claim 2, wherein after receiving the frequency point switch request, the method further comprises:
analyzing the identifier of the target frequency point and the parameter value of the switching time point, which are included in the frequency point switching request;
sending a first confirmation data packet, wherein the first confirmation data packet is used for confirming that the frequency point switching request is received and analyzed;
receiving a second confirmation data packet, wherein the second confirmation data packet is used for confirming that the working frequency point starts to be switched;
determining a switching time point according to the parameter value of the switching time point, comprising:
determining a first time point t for receiving and analyzing the frequency point switching request1And a second time t at which the second acknowledgment packet is received and parsed3；
According to the first time point t1The second time point t3And a fixed time interval T, determining a switching time point as
4. The method of claim 3, further comprising:
detecting whether the second acknowledgement packet is received before the switching time point;
and if the second confirmation data packet is not received at the switching time point, terminating the switching of the working frequency point.
5. The method according to claim 2, wherein after sending the frequency point switch request, the method further comprises:
receiving a first confirmation data packet, wherein the first confirmation data packet is used for confirming that the frequency point switching request is received and analyzed;
sending a second confirmation data packet, wherein the second confirmation data packet is used for confirming the start of switching the working frequency points;
determining a switching time point according to the parameter value of the switching time point, comprising:
determining a third time point t 'at which the first acknowledgement data packet is received and parsed'2；
According to the third time point t'2And a fixed time interval T, and determining that the switching time point is T + T'2。
6. The method of claim 5, further comprising:
detecting whether the first acknowledgement packet is received before the switching time point;
and if the first confirmation data packet is not received at the switching time point, terminating the switching of the working frequency points.
7. Method according to claim 1, characterized in that the theoretical value of the received power in a non-interfering environment at the current actual distance between the transceiving terminals is determined
And signal-to-noise ratio theoretical value under interference-free environment
The method comprises the following steps:
determining the theoretical value of the received power according to the following formula
Determining the theoretical value of the signal-to-noise ratio according to the following formula
Wherein G istRepresenting the antenna gain, G, of the transmitting endrDenotes the antenna gain of the receiving end, λ is a fixed value and denotes the wavelength, PtRepresenting the actual value of the transmitting power of the transmitting terminal, l representing the current actual distance between the transmitting terminal and the receiving terminal, fnRepresenting the power spectral density of the thermal noise, B representing the bandwidth of the radio frequency system, and G being the gain of the radio frequency system to the noise.
8. The method of claim 1, further comprising:
adding the observed values of the electromagnetic environment acquired for multiple times in the history into a ring queue with a preset length according to the acquisition sequence;
determining an average value of the remaining values in the circular queue except the minimum value;
determining a parameter value of an electromagnetic environment where the transmitting end and the receiving end are currently located, including:
comparing the average value with an observed value which is collected in the circular queue at the last time;
and determining the larger of the average value and the observation value collected last time in the circular queue as the parameter value.
9. A frequency point switching device is applied to a receiving end or a transmitting end in a transmitting end and a receiving end, and comprises:
a first determining module for determining the electromagnetic ring where the two transmitting and receiving ends are locatedParameter values of the environment, the parameter values including at least: actual SNR and actual P of received power at the receiving endr；
A second determining module for determining the theoretical value of the received power under the interference-free environment under the current actual distance between the two terminals
And signal-to-noise ratio theoretical value under interference-free environment
A trigger module for triggering the theoretical value of the signal-to-noise ratio
The difference value with the actual SNR value exceeds the allowable SNR error range ScAnd the theoretical value of the received power
And the actual value of received power PrWithin the allowable range of received power error PcWhen the frequency point switching is performed, the receiving end triggers the frequency point switching, or the transmitting end triggers the frequency point switching, so that the working frequency points at the receiving end and the transmitting end are synchronously switched to the target frequency point.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.
11. A wireless device, comprising:
the computer-readable storage medium recited in claim 10; and
one or more processors to execute the computer program in the computer-readable storage medium.
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