CN111988096A

CN111988096A - Method and device for acquiring channel state information and computer equipment

Info

Publication number: CN111988096A
Application number: CN202010844620.9A
Authority: CN
Inventors: 陈昭良
Original assignee: Shenzhen Southern Silicon Valley Semiconductor Co ltd
Current assignee: Shenzhen Nanfang Silicon Valley Semiconductor Co.,Ltd.
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2020-11-24
Anticipated expiration: 2040-08-20
Also published as: CN111988096B

Abstract

The invention provides a method, a device and computer equipment for acquiring channel state information, wherein the method comprises the following steps: acquiring parameter information of a plurality of AP devices in multiple networks or a single network in the same local area; generating a beacon acquisition sequence according to the parameter information corresponding to each AP device; acquiring the corresponding beacon data packet through the beacon acquisition sequence; and calculating CSI corresponding to each AP device according to the collected beacon data packet. The invention has the beneficial effects that: the method comprises the steps of obtaining the sending time and the TBTT period of beacon data packets of each AP device, setting the acquisition period of a beacon acquisition sequence, jumping channels corresponding to each AP device through the beacon acquisition sequence to acquire the beacon data packets, and calculating the CSI of each AP device according to the acquired beacon data packets, so that the technical effect of acquiring the CSI corresponding to a plurality of AP devices in one acquisition period can be achieved, and the CSI acquisition efficiency is improved.

Description

Method and device for acquiring channel state information and computer equipment

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for acquiring channel state information, and a computer device.

Background

The CSI (Channel State Information) is Channel State Information between two wireless devices, and the current method for acquiring the CSI is mainly to connect an AP (Access Point) device through an STA (station) device to send a probe packet for acquisition, so that not only is extra WLAN traffic introduced, but also a single CSI can be acquired from a single router at a time.

Disclosure of Invention

The invention mainly aims to provide a method, a device and computer equipment for acquiring channel state information, and aims to solve the problem of low efficiency in acquiring a plurality of CSI.

The invention provides a method for acquiring channel state information, which comprises the following steps:

acquiring parameter information of a plurality of AP (access point) devices in multiple networks or a single network in the same local area, wherein the parameter information at least comprises corresponding channels, the sending time of a beacon data packet, the transmission time TBTT period of a beacon frame, the signal strength RSSI (received signal strength indicator) and Basic Service Set Identifiers (BSSIDs);

generating a beacon acquisition sequence according to the parameter information corresponding to each AP device; a beacon acquisition cycle of the beacon acquisition sequence is generated according to the sending time and the TBTT cycle in the parameter information of each AP device;

acquiring the corresponding beacon data packets through the beacon acquisition sequence, wherein the acquisition mode is that in one beacon acquisition period, a channel corresponding to each AP device is jumped to acquire the beacon data packets sent by each AP device;

and calculating Channel State Information (CSI) corresponding to each AP device according to the collected beacon data packet.

Further, after the step of calculating the channel state information CSI corresponding to each AP device according to the collected beacon data packet, the method further includes:

and calculating the performance parameters of the WLAN according to the CSI of each AP device.

Further, the step of acquiring parameter information of multiple AP devices in multiple networks or a single network in the same local area includes:

searching corresponding AP equipment according to a frequency band selected by a user, wherein the selected frequency band comprises one or more frequency bands;

scanning the RSSI of the searched AP equipment;

selecting a preset number of target AP devices according to the RSSI of each AP device; wherein the RSSI corresponding to each of the target AP devices is stronger than the RSSI corresponding to the other AP devices that are not selected in the same frequency band.

Further, the step of calculating the channel state information CSI corresponding to each AP device according to the collected beacon data packet includes:

extracting beacon data packets corresponding to the AP equipment in the beacon acquisition sequence according to the acquisition mode of the beacon data packets;

and calculating corresponding CSI according to the beacon data packets corresponding to the AP equipment respectively.

Further, the step of calculating the corresponding CSI according to the beacon data packet corresponding to each AP device includes:

extracting a beacon data packet corresponding to the AP equipment with the 2.4GHz frequency band;

performing data processing in a preset estimation mode according to the extracted beacon data packet, and estimating a Channel Impulse Response (CIR) corresponding to each AP device in a 2.4GHz frequency band;

and converting the channel impulse response CIR into channel state information CSI.

extracting a beacon data packet corresponding to the AP equipment of the 5GHz and/or 6GHz frequency band, wherein the beacon data packet corresponding to the AP equipment of the 5GHz and/or 6GHz frequency band is an Orthogonal Frequency Division Multiplexing (OFDM) beacon data packet;

and extracting Channel State Information (CSI) corresponding to the AP equipment from the OFDM beacon data packet.

Further, the step of collecting the corresponding beacon data packet through the beacon collection sequence includes:

acquiring specified information in a beacon data packet acquired by the beacon acquisition sequence, wherein the specified information comprises one or more of MAC header information, signal-to-noise ratio, received signal strength, BSSID of a client STA and AP equipment;

judging whether the beacon data packet meets the condition of calculating CSI or not according to the specified information;

and if not, continuously acquiring other beacon data packets of the AP equipment corresponding to the beacon data packet through the beacon acquisition sequence.

Further, the step of generating a beacon acquisition sequence according to the parameter information corresponding to each AP device includes:

acquiring the TBTT period and the sending time corresponding to each AP device;

generating a beacon acquisition period according to the least common multiple of each TBTT period and the sending time, wherein the duration of the beacon acquisition period is the multiple of the least common multiple;

calculating the acquisition time of the corresponding beacon data packet in each AP device in one beacon acquisition period according to the TBTT period corresponding to each AP device;

and generating the beacon acquisition sequence according to the beacon acquisition period and the acquisition time of the corresponding beacon data packet in each AP device.

acquiring a corresponding TBTT period and the appearance time point of the beacon data packet in each AP device;

performing asynchronous dynamic sequencing according to a corresponding TBTT period and a beacon data packet occurrence time point in each AP device, wherein the asynchronous dynamic sequencing is to sequence the time for acquiring the beacon data packet of each AP device according to the corresponding TBTT period and the beacon data packet occurrence time point in each AP device;

and generating the beacon acquisition sequence according to the asynchronous dynamic ordering.

The invention also provides a device for acquiring the CSI, which comprises:

a parameter information acquisition module, configured to acquire parameter information of multiple AP devices in a multiple network or a single network in the same local area, where the parameter information at least includes a corresponding channel, a transmission time of a beacon packet, a beacon frame transmission time TBTT period, a signal strength RSSI, and a basic service set identifier BSSID;

a beacon acquisition sequence generation module, configured to generate a beacon acquisition sequence according to the parameter information corresponding to each AP device; a beacon acquisition cycle of the beacon acquisition sequence is generated according to the sending time and the TBTT cycle in the parameter information of each AP device;

the acquisition module is used for acquiring the corresponding beacon data packets through the beacon acquisition sequence, wherein the acquisition mode is that in one beacon acquisition period, a channel corresponding to each AP device jumps to acquire the beacon data packets sent by each AP device;

and the CSI calculation module is used for calculating the CSI corresponding to each AP device according to the acquired beacon data packet.

The invention also provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method when executing the computer program.

The invention also provides 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 as described above.

The invention has the beneficial effects that: the method comprises the steps of obtaining the sending time and the TBTT period of beacon data packets of each AP device, setting the acquisition period of a beacon acquisition sequence, jumping channels corresponding to each AP device through the beacon acquisition sequence to acquire the beacon data packets, and calculating the CSI of each AP device according to the acquired beacon data packets, so that the technical effect of acquiring the CSI corresponding to a plurality of AP devices in one acquisition period can be achieved, and the CSI acquisition efficiency is improved.

Drawings

Fig. 1 is a flowchart illustrating a method for acquiring channel state information according to an embodiment of the present invention;

fig. 2 is a block diagram of a CSI acquisition apparatus according to an embodiment of the present invention;

FIG. 3 is a block diagram of a storage medium according to an embodiment of the present invention;

FIG. 4 is a block diagram of a computer device according to an embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly, and the connection may be a direct connection or an indirect connection.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a method for acquiring channel state information, including:

s1: acquiring parameter information of a plurality of AP (access point) devices in multiple networks or a single network in the same local area, wherein the parameter information at least comprises corresponding channels, the sending time of a beacon data packet, the transmission time TBTT period of a beacon frame, the signal strength RSSI (received signal strength indicator) and Basic Service Set Identifiers (BSSIDs);

s2: generating a beacon acquisition sequence according to the parameter information corresponding to each AP device; a beacon acquisition cycle of the beacon acquisition sequence is generated according to the sending time and the TBTT cycle in the parameter information of each AP device;

s3: acquiring the corresponding beacon data packets through the beacon acquisition sequence, wherein the acquisition mode is that in one beacon acquisition period, a channel corresponding to each AP device is jumped to acquire the beacon data packets sent by each AP device;

s4: and calculating Channel State Information (CSI) corresponding to each AP device according to the collected beacon data packet.

As described in step S1, CSI has recently been applied to various applications such as positioning, motion detection, gesture recognition, object velocity estimation, fall detection, indoor body density estimation, and respiration rate estimation. In order to obtain CSI of multiple networks or multiple AP devices in a single network in the same local area, the CSI of multiple AP devices may be obtained through a single WLAN apparatus, or may also be obtained through multiple WLAN apparatuses, multiple AP devices are selected in the WLAN, and the selected rule may be determined according to the needs of an application program, for example, part of the application program needs an application scenario with a strong 5G signal, so that more 5G AP devices may be selected, that is, the CSI corresponding to the selected AP device is obtained through the selected AP device, and the target performance corresponding to the application program may be calculated, so as to predict the use performance of the application program in the WLAN, and provide a data reference for the application program. Specifically, it is first required to determine the frequency band and channel (for example, one or more of three commonly used frequency bands, 2.4GHz, 5GHz, and 6 GHz) that the application needs to use, and then determine the selected AP device according to the requirements of the application on Received Signal Strength Indication (RSSI) and Signal-to-NOISE RATIO (SNR). The beacon data packet corresponding to the 2.4GHz band is an 802.11b data packet, and the beacon data packet corresponding to the 5/6GHz band is an OFDM (Orthogonal Frequency Division Multiplexing) beacon data packet. The application program may be an application program having any functional purpose of positioning, motion detection, gesture recognition, fall detection, and respiration rate estimation. The channel corresponding to each AP device is scanned, where the channel scanning manner may be scanning the state of the antenna frequency band corresponding to the channel (congestion degree, busy degree, use frequency, etc.) or the total number of packets transmitted by the channel in a period of time, and according to the interference degree corresponding to the total number of packets transmitted, the greater the number of packets, the greater the interference degree. The counting of the total number of packets may be performed by an internal counter, that is, channel information corresponding to the relevant AP device may be acquired, and then one or more kinds of relevant parameter information among a TBTT period, an RSSI, a BSSID, and SNRs of all beacon data packets may be acquired.

As described in the above step S2, a corresponding beacon acquisition sequence is generated according to the acquired parameter information, where the generation may be performed according to the TBTT period of each beacon packet and the transmission time of any one beacon packet, and then the beacon acquisition sequence of the beacon packet in each AP device is acquired through the generated corresponding beacon acquisition period. Specifically, when the beacon data packet of the current acquisition is originated from a single AP device, the acquisition method stays in the same channel, and acquires the beacon data packet once every 100ms (assuming that the TBTT period of the AP device is transmitted once every 100 ms), when the application requires that the acquisition frequency of the CSI is higher than the number (for example, acquiring once every 20 ms), other AP devices that transmit the beacon data packet within the next 20ms need to be acquired, and if the beacon data packet sent by the AP device is in another different channel, the next beacon data packet is acquired in the channel in a channel hopping manner. Specifically, for example, after multi-channel scanning, if it is found that there is a beacon transmitted from the AP device # a in the channel 1 at the 0 th second, there is a beacon transmitted from the AP device # b in the channel 3 at the 20 th ms, and there is a beacon transmitted from the AP device # c in the channel 5 at the 40 th ms, the acquisition mode of the beacon acquisition sequence is set to be such that the beacon acquisition sequence is hopped from the channel 1 to the channel 3 and then to the channel 5 every 20ms, and so on. In some embodiments, if the number of AP devices in multiple networks or a single network in the same local area is small, and the collected data cannot satisfy the calculation of the subsequent application, a proactive probe request may be supplemented to extract CSI from the probe response packet in response; generally, the number of APs of a single WLAN device is sufficient, and the extracted CSI can satisfy the calculation of various applications.

As described in the foregoing steps S3-S4, the beacon data packets may be obtained through the beacon acquisition sequence, and it should be understood that the acquired beacon data packets may be divided according to the beacon acquisition sequence, that is, the AP device corresponding to each acquired beacon data packet may be known, and then the CSI corresponding to each AP device is calculated according to the beacon data packet, where the specific calculation manner is described in detail later. The CSI of each AP device in multiple directions can be collected through a beacon collection sequence, thereby covering different directions of a single WLAN device and increasing coverage. In addition, different CSI may also be obtained from multiple different frequency channels to increase coverage and compute more different frequency characteristics, which provides a more efficient data reference for most applications.

In this embodiment, after the step S4, the method further includes:

s5: and calculating the performance parameters of the WLAN according to the CSI of each AP device.

As described in step S5, the performance parameters of the WLAN can be obtained according to multiple CSIs in a WLAN, and different applications can calculate the performance parameters corresponding to the applications according to different algorithms, so that the application parameters can be set according to the performance parameters to achieve the optimal gain. The algorithm is designed according to a corresponding application program, a specific manner of the algorithm is not limited, and the calculation principle is that calculation is performed according to CSI corresponding to one or more AP devices in the WLAN, for example, if a part of application programs require an application scenario with a strong 5G signal, more weight calculation parameters may be allocated to CSI acquired from a 5G channel.

In this embodiment, before the step S1, the method includes:

s001: searching corresponding AP equipment according to a frequency band selected by a user, wherein the selected frequency band comprises one or more frequency bands;

s002: scanning the RSSI of the searched AP equipment;

s003: selecting a preset number of target AP devices according to the RSSI of each AP device; wherein the RSSI corresponding to each of the target AP devices is stronger than the RSSI corresponding to the other AP devices that are not selected in the same frequency band.

As described in the foregoing steps S001-S003, the user may select a corresponding frequency band according to the needs of the application, for example, two frequency bands of 2.4GHz and 5GHz, and then search for corresponding AP devices in the two frequency bands, where the search may be performed by searching for AP devices that transmit data packets using these channels in different channels corresponding to the two frequency bands, for example, there are 11 to 14 802.11b channels in the 2.4GHz frequency band, and then may detect which AP devices transmit data packets through these channels, and further determine the frequency band corresponding to the AP devices, and then detect the RSSI corresponding to the AP devices, and select several AP devices with the strongest RSSI in each frequency band, so that the finally calculated CSI can meet the requirements of the application on the RSSI. It should be noted that the preset number of AP devices selected in each frequency band may be the same or different, which needs to be determined according to the selection of the application program, if the selection of the application program is biased to 5GHz, the number of AP devices in the 5GHz frequency band may be selected a little more, and each preset number may also be determined according to the actual situation, it should be understood that the more the selected number is, the more it is troublesome to acquire and process the beacon data packet, and the more the operation for designing the beacon acquisition sequence is complicated, but the more the CSI data is correspondingly acquired, and the detection of the performance of the whole WLAN target is closer to the actual value.

In this embodiment, the step S4 includes:

s401: extracting beacon data packets corresponding to the AP equipment in the beacon acquisition sequence according to the acquisition mode of the beacon data packets;

s402: and calculating corresponding CSI according to the beacon data packets corresponding to the AP equipment respectively.

As described in steps S401 to S402, since the beacon acquisition sequence acquires the corresponding beacon data packets according to the set acquisition sequence, the beacon data packets corresponding to each AP device in the beacon acquisition sequence may be extracted according to the acquisition method, and then the corresponding CSI may be calculated according to the beacon data packets corresponding to each AP device.

Further, the step S402 includes:

s4021: extracting a beacon data packet corresponding to the AP equipment with the 2.4GHz frequency band in the AP equipment;

s4022: performing data processing in a preset estimation mode according to the extracted beacon data packet, and estimating a Channel Impulse Response (CIR) corresponding to the AP equipment in the 2.4GHz frequency band;

s4023: and converting the channel impulse response CIR into channel state information CSI.

As described in the foregoing steps S4021 to S4023, the method for calculating the 2.4GHz band may specifically be that a beacon data packet corresponding to the AP device in the 2.4GHz band is extracted, the extraction manner may be correspondingly extracted according to an acquisition manner of the generated beacon acquisition sequence, then the beacon data packet is demodulated to obtain all data content or partial data content of the beacon data packet, and data processing is performed according to all data content or partial data content of the beacon data packet in a preset estimation manner to estimate the specified channel impulse response CIR corresponding to the beacon data packet and convert the estimated specified channel impulse response CIR into the frequency domain CSI. And the AP device in any WLAN needs to broadcast the beacon packet periodically, usually 10 times per second, and has no password or encryption protection, so that it can continuously acquire the wireless channel impulse response CIR and/or frequency domain CSI of the AP device routers of the peripheral WLANs in the range without any password or Media Access Control (MAC) layer connected to the AP device routers of any WLAN, breaking through the limitation that the frequency domain CSI can only be acquired when the WLAN device communicates in the OFDM mode (802.11n/ac/ax) at present, whereas the frequency domain CSI cannot be acquired in the conventional DSSS/cck802.11b mode. According to the method and the device, the connection of a physical layer is not required to be established in the process of obtaining the CSI, the common WLAN communication is not interrupted, extra communication overhead is not introduced, the CSI of all AP equipment routers in the communication signal receiving range can be obtained, the number of CSI sources and the CSI coverage area are increased, and better information technology support is provided for application programs of the CSI in the new field. The method disclosed by the application does not influence the normal receiving and sending of the WLAN, does not need to transmit additional packets, and does not reduce the speed of the WLAN network.

In this embodiment, the step S4 includes:

s411: extracting beacon data packets corresponding to the AP equipment with the frequency band of 5GHz and/or 6GHz from the AP equipment, wherein the beacon data packets corresponding to the AP equipment with the frequency band of 5GHz and/or 6GHz are OFDM beacon data packets;

s412: and extracting Channel State Information (CSI) corresponding to the AP equipment from the OFDM beacon data packet.

As described in the foregoing steps S411 to S412, for the AP devices in the 5GHz and 6GHz bands, the beacon data packet is an OFDM beacon data packet, and the OFDM beacon data packet may directly acquire CSI from the OFDM beacon data packet, which is different from the manner of acquiring CSI in the 2.4GHz band described above, and it should be understood that the acquisition of corresponding CSI can be achieved no matter what frequency band of AP devices is.

In this embodiment, the step S3 includes:

s301: acquiring specified information in a beacon data packet acquired by the beacon acquisition sequence, wherein the specified information comprises one or more of MAC (media access control) header information, signal-to-noise ratio, received signal strength, a client STA (station) source address and BSSID (basic service system identification) of AP (access point) equipment;

s302: judging whether the beacon data packet meets the condition of calculating CSI or not according to the content in the designated information;

s303: and if not, continuously acquiring other beacon data packets of the AP equipment corresponding to the beacon data packet through the beacon acquisition sequence.

As described in the foregoing steps S301 to S303, determining whether the corresponding beacon packet satisfies the condition for calculating CSI according to the specific information, where the specific calculation manner includes comparing whether the SNR is within the SNR preset range, and if not, determining that the condition is not satisfied; comparing whether the RSSI is within the RSSI preset range, and if not, determining that the RSSI does not meet the conditions; the determination of whether the beacon packet is from the expected AP device router or not, and the like, and the comparison information related to the above-mentioned specific information, may be made to determine whether to satisfy the CSI calculation requirement in a single or combined manner.

In this embodiment, the step S2 includes:

s201: acquiring the corresponding TBTT period and the corresponding sending time in each AP device;

s202: generating a beacon acquisition period according to the least common multiple and the sending time of each TBTT period, wherein the duration of the beacon acquisition period is the least common multiple or the multiple of the least common multiple;

s203: calculating the acquisition time of the corresponding beacon data packet in each AP device in one beacon acquisition period according to the corresponding TBTT period in each AP device;

s204: and generating the beacon acquisition sequence according to the beacon acquisition period and the acquisition time of the corresponding beacon data packet in each AP device.

As described in the foregoing steps S201 to S204, the TBTT period in each selected AP device is obtained, and the beacon acquisition period may be the least common multiple of the TBTT periods of the AP devices or a multiple of the least common multiple. In a time of least common multiple, according to the appearance time point (i.e. the transmission time) of the beacon data packet corresponding to each AP device, it is determined whether the beacon data packets of all the AP devices can be collected in the time of least common multiple (i.e. the appearance time of each beacon data packet in the time of least common multiple has no conflict), if there is a conflict in the appearance time of each beacon data packet in the time of least common multiple, the beacon acquisition period may be set to a multiple of the least common multiple, so that beacon packets in each AP device may be acquired, then according to the appearance time and period corresponding to each AP equipment beacon data packet, one of the AP equipment beacon data packets is set in a beacon acquisition period, in addition, if the interval time between two AP devices transmitting beacon packets is short, it can also be considered that there is a collision between the two beacon packets. Then, the acquisition mode (i.e., the hopping sequence and the time point of the beacon acquisition sequence in each channel) and the time of the hopping channel are generated according to the occurrence time point of the beacon data packet of each AP device to obtain the beacon data packet of each AP device, and the duration of the beacon acquisition period is set to the least common multiple or a multiple of the least common multiple, so that the relative occurrence time points of each AP device in each beacon acquisition period are the same, for example, in a first beacon acquisition period, the occurrence time point of a first AP device in a first beacon acquisition period is at the end of 30ms, and the occurrence time point of a second beacon acquisition period is at the end of 30ms, a fixed scheduling table may be set. It should be understood that, if there are many AP devices and their TBTT periods are mutually incoherent, which results in a large least common multiple, or the least common multiple within a set time length cannot be found, then the least common multiple or its multiple is not used as a beacon acquisition period, and real-time dynamic calculation may be performed according to the TBTT period of each AP, so as to dynamically determine the AP device for the next acquisition.

In another embodiment, the step S2 includes:

s211: acquiring a corresponding TBTT period and a beacon data packet occurrence time point in each AP device;

s212: performing asynchronous dynamic sequencing according to the corresponding TBTT period in each AP device and the appearance time point of the beacon data packet, wherein the asynchronous dynamic sequencing is to sequence the time for acquiring the beacon data packet of each AP device according to the corresponding TBTT period in each AP device and the appearance time point of the beacon data packet;

s213: and generating the beacon acquisition sequence according to the asynchronous dynamic ordering.

As described in the above steps S211 to S213, the acquisition time points in the beacon acquisition sequence are determined according to the occurrence time points and TBTT periods of the beacon data packets of the devices of the APs, the TBTT period of each router and the occurrence time points of the beacon data packets thereof are acquired by an asynchronous dynamic ordering method, and the time for acquiring the beacon data packet of each AP device is calculated to jump to the corresponding channel for acquisition. In some embodiments, the obtained CSI in the selected AP devices indicates the same CSI, and at this time, the AP device in the AP devices may be further selected according to the TBTT period and the occurrence time of the beacon data packet thereof, with the beacon acquisition period being the smallest and better.

Referring to fig. 2, the present invention further provides a CSI acquiring apparatus, including:

a parameter information obtaining module 10, configured to obtain parameter information of multiple AP devices in multiple networks or a single network in the same local area, where the parameter information at least includes a corresponding channel, a transmission time of a beacon packet, a beacon frame transmission time TBTT period, a signal strength RSSI, and a basic service set identifier BSSID;

a beacon acquisition sequence generating module 20, configured to generate a beacon acquisition sequence according to the parameter information corresponding to each AP device; a beacon acquisition cycle of the beacon acquisition sequence is generated according to the sending time and the TBTT cycle in the parameter information of each AP device;

an acquisition module 30, configured to acquire the corresponding beacon data packet through the beacon acquisition sequence, where the acquisition mode is to skip a channel corresponding to each AP device to acquire the beacon data packet sent by each AP device in one beacon acquisition period;

and a CSI calculating module 40, configured to calculate, according to the acquired beacon data packet, channel state information CSI corresponding to each AP device. In recent years, the CSI has new applications in different applications such as positioning, motion detection, gesture recognition, target velocity estimation, fall detection, indoor human body density estimation, respiration rate estimation, and the like. In order to obtain CSI of multiple networks or multiple AP devices in a single network in the same local area, the CSI of multiple AP devices may be obtained through a single WLAN apparatus, or may also be obtained through multiple WLAN apparatuses, multiple AP devices are selected in the WLAN, and the selected rule may be determined according to the needs of an application program, for example, part of the application program needs an application scenario with a strong 5G signal, so that more 5G AP devices may be selected, that is, the CSI corresponding to the selected AP device is obtained through the selected AP device, and the target performance corresponding to the application program may be calculated, so as to predict the use performance of the application program in the WLAN, and provide a data reference for the application program. Specifically, it is first required to determine the frequency band and channel (for example, one or more of three commonly used frequency bands, 2.4GHz, 5GHz, and 6 GHz) that the application needs to use, and then determine the selected AP device according to the requirements of the application on Received Signal Strength Indication (RSSI) and Signal-to-NOISE RATIO (SNR). The beacon data packet corresponding to the 2.4GHz band is an 802.11b data packet, and the beacon data packet corresponding to the 5/6GHz band is an OFDM (Orthogonal Frequency Division Multiplexing) beacon data packet. The application program may be an application program having any functional purpose of positioning, motion detection, gesture recognition, fall detection, and respiration rate estimation. The channel corresponding to each AP device is scanned, where the channel scanning manner may be scanning the state of the antenna frequency band corresponding to the channel (congestion degree, busy degree, use frequency, etc.) or the total number of packets transmitted by the channel in a period of time, and according to the interference degree corresponding to the total number of packets transmitted, the greater the number of packets, the greater the interference degree. The counting of the total number of packets may be performed by an internal counter, that is, channel information corresponding to the relevant AP device may be acquired, and then one or more kinds of relevant parameter information among a TBTT period, an RSSI, a BSSID, and SNRs of all beacon data packets may be acquired.

And generating a corresponding beacon acquisition sequence according to the acquired parameter information, wherein the generation mode can be that the beacon acquisition sequence of the beacon data packet in each AP device is acquired according to the TBTT period of each beacon data packet and the transmission time of any one beacon data packet and then the generated corresponding beacon acquisition period. Specifically, when the beacon data packet of the current acquisition is originated from a single AP device, the acquisition method stays in the same channel, and acquires the beacon data packet once every 100ms (assuming that the TBTT period of the AP device is transmitted once every 100 ms), when the application requires that the acquisition frequency of the CSI is higher than the number (for example, acquiring once every 20 ms), other AP devices that transmit the beacon data packet within the next 20ms need to be acquired, and if the beacon data packet sent by the AP device is in another different channel, the next beacon data packet is acquired in the channel in a channel hopping manner. Specifically, for example, after multi-channel scanning, if it is found that there is a beacon transmitted from the AP device # a in the channel 1 at the 0 th second, there is a beacon transmitted from the AP device # b in the channel 3 at the 20 th ms, and there is a beacon transmitted from the AP device # c in the channel 5 at the 40 th ms, the acquisition mode of the beacon acquisition sequence is set to be such that the beacon acquisition sequence is hopped from the channel 1 to the channel 3 and then to the channel 5 every 20ms, and so on. In some embodiments, if the number of AP devices in multiple networks or a single network in the same local area is small, and the collected data cannot satisfy the calculation of the subsequent application, a proactive probe request may be supplemented to extract CSI from the probe response packet in response; generally, the number of APs of a single WLAN device is sufficient, and the extracted CSI can satisfy the calculation of various applications.

Corresponding beacon data packets can be obtained through the beacon acquisition sequence, it should be understood that the acquired beacon data packets can be divided according to the beacon acquisition sequence, that is, the AP device corresponding to each acquired beacon data packet can be known, then CSI corresponding to each AP device can be calculated according to the beacon data packet, and the specific calculation mode is described in detail later. The CSI of each AP device in multiple directions can be collected through a beacon collection sequence, thereby covering different directions of a single WLAN device and increasing coverage. In addition, different CSI may also be obtained from multiple different frequency channels to increase coverage and compute more different frequency characteristics, which provides a more efficient data reference for most applications.

In this embodiment, the CSI acquiring apparatus further includes:

and the performance parameter calculation module is used for calculating the performance parameters of the WLAN according to the CSI of each AP device.

The performance parameters of the WLAN can be obtained according to a plurality of CSIs in the WLAN, and different applications can calculate the performance parameters corresponding to the applications according to different algorithms, so that the application parameters can be set according to the performance parameters to achieve the optimal gain. The algorithm is designed according to a corresponding application program, a specific manner of the algorithm is not limited, and the calculation principle is that calculation is performed according to CSI corresponding to one or more AP devices in the WLAN, for example, if a part of application programs require an application scenario with a strong 5G signal, more weight calculation parameters may be allocated to CSI acquired from a 5G channel.

In this embodiment, the CSI acquiring apparatus further includes:

the searching module is used for searching the corresponding AP equipment according to the frequency band selected by the user, wherein the selected frequency band comprises one or more frequency bands;

the scanning module is used for scanning the RSSI of the searched AP equipment;

the selecting module is used for selecting a preset number of target AP devices according to the RSSI of each AP device; wherein the RSSI corresponding to each of the target AP devices is stronger than the RSSI corresponding to the other AP devices that are not selected in the same frequency band.

The user can select corresponding frequency bands according to the needs of the application program, for example, two frequency bands of 2.4GHz and 5GHz, and then search for corresponding AP devices in the two frequency bands, where the search mode may be to search for AP devices that transmit data packets using these channels in different channels corresponding to the two frequency bands, for example, there are 11 to 14 802.11b channels in the 2.4GHz frequency band, and then detect which AP devices transmit data packets through these channels, and further determine the frequency bands corresponding to the AP devices, and then detect the RSSI corresponding to the AP devices, and select several AP devices with the strongest RSSI of each frequency band, so that the finally calculated CSI can meet the requirements of the application program on the RSSI. It should be noted that the preset number of AP devices selected in each frequency band may be the same or different, which needs to be determined according to the selection of the application program, if the selection of the application program is biased to 5GHz, the number of AP devices in the 5GHz frequency band may be selected a little more, and each preset number may also be determined according to the actual situation, it should be understood that the more the selected number is, the more it is troublesome to acquire and process the beacon data packet, and the more the operation for designing the beacon acquisition sequence is complicated, but the more the CSI data is correspondingly acquired, and the detection of the performance of the whole WLAN target is closer to the actual value.

In this embodiment, the CSI calculating module 40 includes:

the extracting submodule is used for extracting the beacon data packets corresponding to the AP equipment in the beacon acquisition sequence according to the acquisition mode of the beacon data packets;

and the CSI calculation submodule is used for calculating corresponding CSI according to the beacon data packets corresponding to the AP equipment respectively.

Because the beacon acquisition sequence acquires the corresponding beacon data packets according to the set acquisition sequence, the beacon data packets corresponding to each AP device in the beacon acquisition sequence can be extracted according to the acquisition mode, and then the corresponding CSI is calculated according to the beacon data packets corresponding to each AP device.

Further, the CSI calculation sub-module includes:

a first extraction unit, configured to extract a beacon data packet corresponding to an AP device in a 2.4GHz band in the AP device;

the estimation unit is used for carrying out data processing in a preset estimation mode according to the extracted beacon data packet and estimating a Channel Impulse Response (CIR) corresponding to the AP equipment in the 2.4GHz frequency band;

and the conversion unit is used for converting the channel impulse response CIR into channel state information CSI.

The method for calculating the 2.4GHz band may specifically be that a beacon data packet corresponding to the AP device in the 2.4GHz band is extracted, the extraction mode may be correspondingly extracted according to an acquisition mode of a generated beacon acquisition sequence, then the beacon data packet is demodulated to obtain all data content or partial data content of the beacon data packet, and data processing is performed according to all data content or partial data content of the beacon data packet in a preset estimation mode to estimate the specified channel impulse response CIR corresponding to the beacon data packet and convert the estimated channel impulse response CIR into the frequency domain CSI. And the AP device in any WLAN needs to broadcast the beacon packet periodically, usually 10 times per second, and has no password or encryption protection, so that it can continuously acquire the wireless channel impulse response CIR and/or frequency domain CSI of the AP device routers of the peripheral WLANs in the range without any password or Media Access Control (MAC) layer connected to the AP device routers of any WLAN, breaking through the limitation that the frequency domain CSI can only be acquired when the WLAN device communicates in the OFDM mode (802.11n/ac/ax) at present, whereas the frequency domain CSI cannot be acquired in the conventional DSSS/CCK802.11b mode. According to the method and the device, the connection of a physical layer is not required to be established in the process of obtaining the CSI, the common WLAN communication is not interrupted, extra communication overhead is not introduced, the CSI of all AP equipment routers in the communication signal receiving range can be obtained, the number of CSI sources and the CSI coverage area are increased, and better information technology support is provided for application programs of the CSI in the new field. The method disclosed by the application does not influence the normal receiving and sending of the WLAN, does not need to transmit additional packets, and does not reduce the speed of the WLAN network.

Further, the CSI calculation sub-module further includes:

a second extraction unit, configured to extract a beacon data packet corresponding to an AP device in a 5GHz and/or 6GHz band in the AP device, where the beacon data packet corresponding to the AP device in the 5GHz and/or 6GHz band is an OFDM beacon data packet;

and the CSI extraction unit is used for extracting the channel state information CSI corresponding to the AP equipment from the OFDM beacon data packet.

For the AP devices in the 5GHz and 6GHz bands, the beacon data packets are OFDM beacon data packets, and the OFDM beacon data packets can directly acquire CSI from the OFDM beacon data packets, which is different from the above-mentioned manner for acquiring CSI in the 2.4GHz band, and it should be understood that the acquisition of corresponding CSI can be achieved no matter what band of AP devices is.

In this embodiment, the collecting module 30 includes:

the designated information acquisition submodule is used for acquiring designated information in the beacon data packet acquired by the beacon acquisition sequence, wherein the designated information comprises one or more of MAC header information, signal-to-noise ratio, received signal strength, source address STA and base station system address BSSID of the AP equipment;

the judgment submodule judges whether the beacon data packet meets the condition of calculating CSI or not according to the content in the specified information;

and the continuous acquisition module is used for continuously acquiring other beacon data packets of the AP equipment corresponding to the beacon data packet through the beacon acquisition sequence when the requirement for calculating the CSI is not met.

Judging whether the corresponding beacon data packet meets the condition for calculating the CSI or not according to the specified information, wherein the specific calculation mode comprises the steps of comparing whether the SNR is within a preset range of the SNR or not, and if not, determining that the condition is not met; comparing whether the RSSI is within the RSSI preset range, and if not, determining that the RSSI does not meet the conditions; the determination of whether the beacon packet is from the expected AP device router or not, and the like, and the comparison information related to the above-mentioned specific information, may be made to determine whether to satisfy the CSI calculation requirement in a single or combined manner.

In this embodiment, the beacon acquisition sequence generating module 20 includes:

a TBTT period obtaining submodule, configured to obtain the corresponding TBTT period and the corresponding sending time in each AP device;

the acquisition period generation submodule is used for generating a beacon acquisition period according to the least common multiple and the sending time of each TBTT period, wherein the duration of the beacon acquisition period is the least common multiple or the multiple of the least common multiple;

the acquisition time calculation sub-module is used for calculating the acquisition time of the corresponding beacon data packet in each AP device in one beacon acquisition period according to the corresponding TBTT period in each AP device;

and the first beacon acquisition sequence generation submodule is used for generating the beacon acquisition sequence according to the beacon acquisition period and the acquisition time of the corresponding beacon data packet in each AP device.

And acquiring the TBTT period of each selected AP device, wherein the beacon acquisition period can be the least common multiple of the TBTT periods of the AP devices or the multiple of the least common multiple. In a time of least common multiple, according to the appearance time point (i.e. the transmission time) of the beacon data packet corresponding to each AP device, it is determined whether the beacon data packets of all the AP devices can be collected in the time of least common multiple (i.e. the appearance time of each beacon data packet in the time of least common multiple has no conflict), if there is a conflict in the appearance time of each beacon data packet in the time of least common multiple, the beacon acquisition period may be set to a multiple of the least common multiple, so that beacon packets in each AP device may be acquired, then according to the appearance time and period corresponding to each AP equipment beacon data packet, one of the AP equipment beacon data packets is set in a beacon acquisition period, in addition, if the interval time between two AP devices transmitting beacon packets is short, it can also be considered that there is a collision between the two beacon packets. Then, the acquisition mode (i.e., the hopping sequence and the time point of the beacon acquisition sequence in each channel) and the time of the hopping channel are generated according to the occurrence time point of the beacon data packet of each AP device to obtain the beacon data packet of each AP device, and the duration of the beacon acquisition period is set to the least common multiple or a multiple of the least common multiple, so that the relative occurrence time points of each AP device in each beacon acquisition period are the same, for example, in a first beacon acquisition period, the occurrence time point of a first AP device in a first beacon acquisition period is at the end of 30ms, and the occurrence time point of a second beacon acquisition period is at the end of 30ms, a fixed scheduling table may be set. It should be understood that, if there are many AP devices and their TBTT periods are mutually incoherent, which results in a large least common multiple, or the least common multiple within a set time length cannot be found, then the least common multiple or its multiple is not used as a beacon acquisition period, and real-time dynamic calculation may be performed according to the TBTT period of each AP, so as to dynamically determine the AP device for the next acquisition.

In another embodiment, the beacon acquisition sequence generation module 20 includes:

the acquisition submodule acquires a corresponding TBTT period and a beacon data packet occurrence time point in each AP device;

the asynchronous dynamic sequencing submodule is used for carrying out asynchronous dynamic sequencing according to the corresponding TBTT period in each AP device and the appearance time point of the beacon data packet, wherein the asynchronous dynamic sequencing is used for sequencing the time for acquiring the beacon data packet of each AP device according to the corresponding TBTT period in each AP device and the appearance time point of the beacon data packet;

and the second beacon acquisition sequence generation submodule is used for generating the beacon acquisition sequence according to the asynchronous dynamic ordering.

And determining the acquisition time point in the beacon acquisition sequence according to the occurrence time point and the TBTT period of the beacon data packet of each AP device, acquiring the TBTT period and the occurrence time point of the beacon data packet of each router by an asynchronous dynamic sequencing method, and calculating the time for acquiring the beacon data packet of each AP device so as to jump to a corresponding channel for acquisition. In some embodiments, the obtained CSI in the selected AP devices indicates the same CSI, and at this time, the AP device in the AP devices may be further selected according to the TBTT period and the occurrence time of the beacon data packet thereof, with the beacon acquisition period being the smallest and better.

Referring to fig. 3, the present application further provides a storage medium 100, in which a computer program 200 is stored in the storage medium 100, and when the computer program runs on a computer, the computer is caused to execute the method for acquiring channel state information described in the above embodiment.

Referring to fig. 4, the present application further provides a computer device 300 comprising the storage medium 100, when the computer program 200 stored in the storage medium 100 runs on the computer device 300, the computer device 300 is enabled to execute the method for acquiring channel state information described in the above embodiment by the processor 400 arranged inside the computer device 300.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a storage medium or transmitted from one storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The storage medium may be any available medium that a computer can store or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for acquiring channel state information is characterized by comprising the following steps:

2. The method for acquiring channel state information according to claim 1, wherein after the step of calculating the channel state information CSI corresponding to each AP device according to the collected beacon data packet, the method further comprises:

3. The method for acquiring csi of claim 1, wherein the step of acquiring the parameter information of multiple APs in multiple networks or a single network in the same lan is preceded by:

scanning the RSSI of the searched AP equipment;

4. The method for acquiring channel state information according to claim 1, wherein the step of calculating the channel state information CSI corresponding to each AP device according to the collected beacon data packet includes:

5. The method for acquiring channel state information according to claim 1, wherein the step of acquiring the corresponding beacon data packet through the beacon acquisition sequence includes:

acquiring specified information in a beacon data packet acquired by the beacon acquisition sequence, wherein the specified information comprises one or more of MAC header information, signal-to-noise ratio, received signal strength, a client STA source address and BSSID of AP equipment;

6. The method for acquiring channel state information according to claim 1, wherein the step of generating a beacon acquisition sequence according to the parameter information corresponding to each AP device includes:

acquiring the TBTT period and the sending time corresponding to each AP device;

7. The method for acquiring channel state information according to claim 1, wherein the step of generating a beacon acquisition sequence according to the parameter information corresponding to each AP device includes:

8. An apparatus for acquiring CSI, comprising:

9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.

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 of any one of claims 1 to 7.