WO2018090949A1 - 一种基于802.11网络的csi获取方法及装置 - Google Patents

一种基于802.11网络的csi获取方法及装置 Download PDF

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Publication number
WO2018090949A1
WO2018090949A1 PCT/CN2017/111309 CN2017111309W WO2018090949A1 WO 2018090949 A1 WO2018090949 A1 WO 2018090949A1 CN 2017111309 W CN2017111309 W CN 2017111309W WO 2018090949 A1 WO2018090949 A1 WO 2018090949A1
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csi
channel
target
interface
list
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PCT/CN2017/111309
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English (en)
French (fr)
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邢志浩
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华为技术有限公司
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Priority to EP17871439.0A priority Critical patent/EP3537639B1/en
Publication of WO2018090949A1 publication Critical patent/WO2018090949A1/zh
Priority to US16/415,409 priority patent/US11070271B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a CSI (English: Channel State Information) acquisition method and apparatus based on an 802.11 network.
  • CSI International: Channel State Information
  • the CSI of the location of the terminal can be collected to determine the location of the terminal, thereby achieving the effect of positioning the terminal.
  • a STA (English: Station, Chinese: Site) device receives a PPDU (English: Physical-layer Protocol Data Unit) from the air interface
  • the physical layer passes the PPDU preamble.
  • the CSI includes a channel between the transmitter and the terminal as the receiver, and affects the amplitude and phase of the wireless data signal, and the receiver can accordingly compensate and correct the received data signal to improve the data. Signal signal to noise ratio and demodulation quality.
  • the CSI is tightly coupled to the data receiving process and is only used internally by the PPDU demodulation process, and cannot be used by the service requesting program such as the upper layer application for the terminal positioning process.
  • a typical working mode of a STA device is to first join a network created by an 802.11 AP (English: Access Point, Chinese: Access Point) device, and then keep transmitting and receiving data on the channel on which the AP device works. . During this process, the STA device can only detect and receive PPDUs that appear on its current working channel.
  • 802.11 AP English: Access Point, Chinese: Access Point
  • the CSI collection can be completed by using the technical solutions provided by the prior art, the collected CSI cannot be applied to the positioning application, and the terminal positioning process cannot be completed according to the collected CSI.
  • the collected CSI has a large limitation, that is, only includes the CSI between the AP device on the channel on which the terminal is currently located and the terminal. Therefore, the foregoing CSI obtaining solution cannot provide a comprehensive CSI for terminal positioning, which reduces the accuracy of the terminal positioning process.
  • the invention provides a CSI acquisition method and device based on an 802.11 network, and can provide a CSI acquisition mechanism for positioning requirements, so as to improve the accuracy of the terminal positioning process by providing a more comprehensive CSI for the terminal.
  • the embodiment of the present invention adopts the following technical solutions:
  • the present invention provides a CSI acquisition method based on an 802.11 network, which is used in an 802.11 STA devices in the network.
  • the STA device is provided with a CSI obtaining module and a service requesting program running on the STA device, and the service requesting program and the CSI obtaining module can perform data transmission through the service request interface and the asynchronous notification interface.
  • the method includes: the CSI obtaining module receives, by using a service request interface, a request message sent by the service requesting program, where the request message includes at least a listening channel list, a channel staying listening time, and a target AP device list, where the listening channel list records the frequency band to be monitored.
  • the CSI acquisition module listens to the PPDU sent by the target AP device on a single channel and extracts the CSI therefrom; the CSI acquisition module records in the listening channel list.
  • the CSI is extracted from the PPDUs sent by all the target AP devices recorded in the target AP device list according to the channel staying listening time; when a group of CSIs is collected, the CSI obtaining module sends the service requesting program through the asynchronous notification interface.
  • the set of CSIs is sent, where the set of CSIs is used to indicate the CSI carried by the same PPDU collected.
  • the service request interface and the asynchronous notification interface provided by the present invention can implement the CSI collection request from the service requesting program, such as the upper layer application, and collect the CSI between the STA device and the AP device that meets the requirements.
  • the STA device can be provided with more comprehensive CSI in time for the positioning requirement, thereby improving the accuracy of the terminal positioning process.
  • nothing may be recorded in the listener channel list. Then, after the CSI obtaining module receives the request message sent by the service requesting program through the service requesting interface, the CSI obtaining module may directly in the PPDU sent by all the target AP devices recorded in the target AP device list on the channel where the STA device is currently located. Extract CSI, which improves the efficiency and quality of CSI acquisition.
  • the CSI acquisition module extracts the CSI from the PPDUs sent by all the target APs in the target AP device list, and the CSI acquisition module obtains the AP device that sends the PPDUs from the received PPDUs.
  • the MAC address is obtained, and when the MAC address is the MAC address of the target AP device, the CSI acquisition module extracts the CSI from the PPDU, thereby ensuring that the collected CSI is the CSI required by the STA device, and improving the CSI acquisition efficiency and quality.
  • the content of the target AP device may not be recorded, or at least one MAC address of the target AP device is a special preset value, and the special preset value does not represent any target. MAC address of the AP device.
  • the request message may also include the director listening time. Then, after the CSI obtaining module sends the set of CSIs to the service requesting program through the asynchronous notification interface, when the sum of the times of monitoring on each channel to be monitored is less than the listening time of the director, the CSI acquiring module can follow the channel staying listening time. And continuing to receive PPDUs sent by all target AP devices on the to-be-monitored channel and extract CSI. In other words, if the dwell time on the current channel does not exceed the channel stay listening time, the CSI continues to be monitored and acquired on the current channel; otherwise, the channel monitored by the STA device is switched to the next channel in the channel listening list. The channel listens and completes the CSI acquisition process for the next channel.
  • the CSI obtaining module instructs the STA device to switch the working channel to the first to-be-monitored channel of the channel listening list to start the next round of CSI acquisition process.
  • the CSI acquisition process is repeated until the CSI acquisition module receives the CSI collection message of “stop acquiring CSI” sent by the CSI service requesting program.
  • the CSI acquisition module stops the CSI acquisition process, or until the total time of the monitoring reaches the director listening time.
  • the service request interface may specifically include a first service request interface and a second service request interface
  • the CSI obtaining module can receive the request message sent by the service requesting program through the first service request interface; and acquire the module in the CSI.
  • the terminating CSI collection message sent by the service requesting program is received through the second service requesting interface, and the CSI collection process is terminated.
  • the request message may further include a maximum CSI acquisition interval.
  • the CSI obtaining module is located to each channel in the same AP device.
  • the AP device broadcasts the request message, so that each AP device in the channel where the same AP device is located sends a response message to the CSI acquisition module.
  • the CSI acquisition module extracts the CSI from the response message.
  • the CSI obtaining module sends the CSI to the service requesting program through the asynchronous notification interface, and the CSI obtaining module generates a CSI notification message corresponding to the CSI, and the CSI notification message includes the MAC.
  • An address and a content of the group of CSIs, the MAC address is a MAC address of the AP device that sends the PPDU carrying the set of CSIs; the CSI obtaining module sends a CSI notification message to the service requesting program, so that the service requesting program can notify according to the CSI Message to implement this set of CSI calls.
  • the present invention provides an 802.11 network-based CSI acquisition device, which can implement the functions performed by the CSI acquisition module in the foregoing method example, and the functions can be implemented by hardware or by executing corresponding software through hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other devices.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • the present invention sets a service request interface and an asynchronous notification interface on the STA device in the 802.11 network, and the two interfaces can implement data transmission between the service request program and the CSI acquisition module.
  • the CSI obtaining module can receive the request message sent by the requesting service program through the service request interface, where the request message includes at least the monitoring channel list, the channel staying listening time, and the target AP device list, and then the CSI obtaining module can lock the to-be-listened according to the foregoing parameter.
  • the CSI obtaining module can timely feed back the set of CSIs to the service requesting program through the asynchronous notification interface.
  • the service request interface and the asynchronous notification interface provided by the present invention can implement the CSI collection request from the service requesting program, such as the upper layer application, and collect the CSI between the STA device and the AP device that meets the requirements. In this way, the STA device can be provided with more comprehensive CSI in time for the positioning requirement, thereby improving the accuracy of the terminal positioning process.
  • FIG. 1 is a structural diagram of data interaction between an upper layer application and a CSI obtaining module according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for acquiring a CSI based on an 802.11 network according to an embodiment of the present invention
  • FIG. 9 are flowcharts of another method for acquiring CSI based on an 802.11 network according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a CSI acquiring apparatus based on an 802.11 network according to an embodiment of the present disclosure
  • FIG. 11 is a schematic structural diagram of another CSI acquiring apparatus based on an 802.11 network according to an embodiment of the present invention.
  • the service request interface may include a first service request interface and a second service request interface, and then the service requesting program may send a request message to the CSI obtaining module through the first service requesting interface, and may also send the request message through the second service request interface.
  • the CSI acquisition module sends a terminating CSI acquisition message such as "stop acquiring CSI.”
  • An embodiment of the present invention provides a CSI acquisition method based on an 802.11 network. As shown in FIG. 2, the method can be applied to an 802.11 STA device, that is, a STA device in an 802.11 network communication system, where the method includes:
  • the CSI obtaining module receives the request message sent by the service requesting program through the service request interface.
  • the request message includes at least a monitoring channel list, a channel staying listening time, and a target AP device list.
  • the listening channel list records the to-be-monitored frequency band and the to-be-monitored channel corresponding to each to-be-monitored frequency band, and the channel staying listening time is CSI.
  • the 802.11 standard has multiple frequency bands (English: band) in 2.4 GHz, 5 GHz, and 60 GHz. Each channel defines multiple channels (English: channel), and in different countries and regions, due to radio control. The prescribed differences are also different for the actual available channel list.
  • the STA device to be located can know the working channel of each AP device in the environment in advance through some technical means (for example, by querying the dedicated server). Therefore, the foregoing listening channel list may indicate a channel that needs to be monitored during the process of acquiring the CSI.
  • the CSI obtaining module may instruct the STA device to stay on each channel of the list according to the listening channel list.
  • the PPDU sent by the neighboring AP device appearing in the air interface is received, and the CSI is extracted therefrom.
  • the STA device can be prevented from performing invalid interception on some channels where the AP device does not appear, thereby improving CSI acquisition efficiency.
  • the STA device to be located can obtain the working parameter information of each AP device in the environment, such as the MAC address, working frequency band, and working channel of the AP device, by using some technical means (such as querying through a server). And periodically transmitting information such as the transmission frequency of a frame (such as a beacon frame or other frames), so that when the CSI with the surrounding AP devices is acquired, the target AP device that is to be collected is specified to improve CSI collection. Efficiency or collection quality, therefore, a list of target AP devices can be carried in the request message.
  • the CSI acquisition module After receiving the request message, the CSI acquisition module starts the CSI acquisition process. It should be noted that the STA device does not need to join the network created by any AP device to perform the CSI acquisition task, but immediately starts performing channel monitoring, and receives and processes the PPDUs that appear on the air interface, and extracts the STA where the CSI acquisition module is located. CSI between the device and the AP device that sends the PPDU.
  • the channel staying listening time may be regarded as a time for instructing the CSI acquiring module to listen to the PPDU sent by the AP device on a single channel and extract CSI therefrom.
  • the channel staying listening time is the listening time for each channel to be monitored.
  • each channel to be monitored is monitored.
  • the channel pause listening time can be the same.
  • the CSI obtaining module extracts CSI from the PPDUs sent by all the target AP devices recorded in the target AP device list according to the channel stay monitoring time on all the channels to be monitored recorded in the listening channel list.
  • the short training field (English: Short Training Field, STF for short) and the long training field (English: Long Training Field, LTF for short) are all a predefined fixed symbol sequence.
  • the CSI may be obtained by processing the LTF in the PPDU preamble sequence.
  • 802.11 includes many different systems, such as 802.11b/g/a/n/ac, etc.
  • the LTF format, the number in the preamble sequence, and the bandwidth occupied during transmission are different. Therefore, in the process of extracting CSI, different processing needs to be performed for different PPDUs, and details are not described herein.
  • the wider the transmission bandwidth of the LTF the higher the time resolution of the corresponding acquired CSI, and the more the positioning accuracy is improved; the more the number of LTFs, the more the number of spatial streams included in the corresponding CSI, meaning Better spatial resolution and higher positioning accuracy.
  • the STA device In order to enable real-time positioning during the STA device movement, the STA device needs to be able to continuously acquire CSI from the neighboring AP device, that is, can periodically receive the PPDU sent by the neighboring AP device.
  • There are at least two periodically transmitted management frames in 802.11 that can be used to obtain CSI that is, a beacon frame (English: Beacon Frame) and a measurement pilot frame (English: Measurement Pilot Frame).
  • a beacon frame an AP device in a BSS (English: Basic Service Set) network of 802.11 must periodically broadcast a beacon frame. By default, the broadcast period of this frame is 100ms.
  • the frame is an RF measurement frame defined in 802.11, which is used to assist the STA device that needs to access the Wi-Fi (Wireless Fidelity, Chinese: Wireless Local Area Network) network to complete the network scanning quickly.
  • the frame is an optional frame, and the information contained in the frame is a subset of the beacon frame, the frame length is small, but the broadcast frequency is higher than the beacon frame.
  • the broadcast period of the frame can be configured to be 3% to 50% of the beacon frame interval.
  • the CSI acquiring module on the STA device may extract the CSI, that is, the PPDUs received in the embodiment of the present invention may be in addition to the foregoing management frames. It is the PPDU corresponding to all other existing frames in 802.11 or the frames that may appear in 802.11 in the future, and extracts CSI from it.
  • the CSI obtaining module sends the request to the service requesting program through the asynchronous notification interface. This set of CSIs.
  • the CSI is used to indicate the CSI carried by the same PPDU.
  • the information and the specific expression format included in the CSI may be defined by the format of the CSI Report field in the CSI frame defined by the 802.11 standard.
  • the collected CSI can be immediately serviced after the CSI collection process carried by the same PPDU is completed.
  • the requestor is sent to ensure that the CSI can be fed back to the service requester as soon as possible.
  • the service request interface and the asynchronous notification interface provided by the present invention can implement CSI collection request proposed by a service requesting program such as an upper layer application, and collect CSI between the STA device and the AP device that meets the requirements. In this way, the STA device can be provided with more comprehensive CSI in time for the positioning requirement, thereby improving the accuracy of the terminal positioning process.
  • the CSI obtaining module may directly from the STA device, in consideration of the fact that the listener channel list may be empty in the request message.
  • the target AP devices recorded in the target AP device list are monitored on the channel, and the CSI is extracted from the PPDUs sent by the target AP devices. Therefore, on the basis of the implementation shown in FIG. 2, an implementation as shown in FIG. 3 can also be implemented.
  • the CSI obtaining module receives the request message sent by the service requesting program through the service requesting interface, and may perform step 104:
  • the CSI acquiring module extracts the CSI from the PPDUs sent by all the target AP devices recorded in the target AP device list on the channel where the STA device is currently located.
  • the CSI acquisition module can only listen to the channel where the STA device is currently located, and complete the monitoring of the target AP device according to the target AP device list.
  • the STA device can extract CSI only from the PPDUs received on the channel where the STA device is currently located, which improves the acquisition efficiency and quality of the CSI.
  • a method for extracting CSI from a specified PPDU is provided. Based on the implementation shown in FIG. 2, an implementation as shown in FIG. 4 can also be implemented.
  • the CSI acquiring module extracts the CSI from the PPDUs sent by all the target APs in the target AP device list according to the channel staying listening time, and the method is implemented as step 1021.
  • step 1022 the CSI acquiring module extracts the CSI from the PPDUs sent by all the target APs in the target AP device list according to the channel staying listening time, and the method is implemented as step 1021.
  • step 1022 is implemented as step 1021.
  • the CSI obtaining module obtains the MAC of the AP device that sends the PPDU from the received PPDU according to the channel stay monitoring time on all the channels to be monitored recorded in the listening channel list (English: Media Access Control, Chinese: Media Access Control) )address.
  • the CSI obtaining module extracts the CSI from the PPDU.
  • the CSI can demodulate and decode the PPDU to obtain the MAC address carried in the PPDU. If the MAC address is recorded in the second list, the AP device corresponding to the MAC address is considered to be the AP device to be intercepted, and the CSI is extracted from the PPDU.
  • the STA device can determine, in the process of collecting the CSI, which AP devices in the to-be-listened channel can send PPDUs to be used according to the AP device to be monitored recorded in the second list carried in the request message. Extracting CSI, and when the monitored PPDU is a message sent by the AP device to be intercepted, from the PPDU The CSI is extracted to ensure that the collected CSI is the CSI required by the STA device, and the acquisition efficiency and quality of the CSI are improved.
  • the CSI acquisition module still The implementation of the CSI can be successfully completed.
  • an implementation manner as shown in FIG. 5 can also be implemented on the basis of the implementation manner shown in FIG. 4 .
  • the CSI obtaining module receives the request message sent by the service requesting program through the service requesting interface, and may perform step 105:
  • the CSI obtaining module extracts CSI from all received PPDUs according to the channel staying listening time on all the channels to be monitored recorded in the listening channel list.
  • the CSI obtaining module may, according to the content recorded in the listening channel list, from each channel to be monitored within a time specified by the channel stay monitoring time.
  • the CSI is directly extracted from the received PPDU.
  • the CSI is continuously monitored and acquired on the current channel; otherwise, the channel monitored by the STA device is switched to the channel listening list. The next channel of the current channel is monitored, and the CSI acquisition process of the next channel is completed. After completing the CSI acquisition process for the last to-be-monitored channel in the channel listening list, the CSI obtaining module instructs the STA device to switch the working channel to the first to-be-monitored channel of the channel listening list to start the next round of CSI acquisition process.
  • the CSI acquisition process is repeated until the CSI acquisition module receives the CSI acquisition message of “stop acquiring CSI” sent by the CSI service request procedure, and the CSI acquisition module stops the CSI acquisition process, or until the total time of the monitoring reaches the director listening time. Therefore, for the process of repeating the monitoring, on the basis of the implementation shown in FIG. 2, it can also be implemented as the implementation shown in FIG. 6.
  • the CSI obtaining module may further perform step 106:
  • the CSI acquiring module continues to receive the PPDUs sent by all the target AP devices on the channel to be monitored according to the channel staying listening time and extracts the CSI.
  • the service request interface may include a first service request interface and a second service request interface, where the first service request interface is configured to receive a request message sent by the service requesting program, and the second service request The interface is configured to receive a message sent by the service requester to terminate the CSI collection process.
  • the step 101 CSI obtaining module receives the request message sent by the service requesting program through the service requesting interface, which may be specifically implemented as step 1011.
  • the CSI obtaining module sends the request to the service requesting program through the asynchronous notification interface.
  • step 107 can also be performed:
  • the CSI obtaining module receives, by using a first service request interface, a request message sent by a service requesting program.
  • the CSI obtaining module receives the terminating CSI collection message sent by the service requesting program by using the second service requesting interface, and terminates the CSI collection process.
  • the request message may also carry a maximum CSI acquisition interval.
  • the implementation manner may also be implemented as shown in FIG. 8.
  • the CSI obtaining module broadcasts a request message to each AP device in the channel where the same AP device is located.
  • each AP device in the channel where the same AP device is located sends a response packet to the CSI acquisition module, and then the CSI acquisition module can complete the CSI extraction from the response packet, thereby ensuring the current positioning scheme for CSI acquisition.
  • the time interval needs.
  • the CSI obtaining module extracts CSI from the response message.
  • the collection interval satisfies the requirement of the CSI to obtain the service request application.
  • the request message may also carry the expected maximum CSI collection interval (hereinafter, it is identified as T req ), that is, the maximum CSI acquisition described above. interval.
  • T req the expected maximum CSI collection interval
  • the active channel scanning mechanism may be used to actively trigger the corresponding AP device to send the PPDU, so that the TRP can be acquired at least once every T req .
  • CSI between the AP devices may be used to actively trigger the corresponding AP device to send the PPDU, so that the TRP can be acquired at least once every T req .
  • the request message includes a channel listening list and a channel staying listening time (hereinafter referred to as a linger ).
  • the CSI obtaining module needs to instruct the STA device to specify the channel listening list.
  • Each channel to be monitored stays on the channel to be monitored for a T linger time.
  • T linger time
  • T 1round is hereinafter referred to as CSI basic acquisition period
  • the duration represented by the basic acquisition period is The minimum time interval that the CSI acquisition module can implement when acquiring CSI.
  • the T req carried in the request message needs to be an integer multiple of T 1round .
  • the following describes the specific implementation manner of ensuring that the time interval for obtaining CSI by the CSI acquisition module is not greater than the expected maximum CSI acquisition time interval carried in the request message by using the active channel scanning mechanism:
  • the statistical period of the CSI acquisition interval between the STA device to be located and the neighboring AP device is defined (hereinafter, it is T stat ), and the length of T stat can be set to an integral multiple of T req .
  • the CSI acquisition module instructs the STA device to acquire the CSI by channel-by-channel scanning according to the channel listening list
  • the CSI obtaining module maintains a peripheral AP device CSI acquisition time table, and updates the information in the table according to the T stat period.
  • the table records the channels of each AP device that is scanned in the current statistical period (the STA device receives the PPDU sent by the AP device, that is, the AP device is considered to be scanned), and the time of each scan to each AP device, and At the end of the statistics period, the maximum time interval for each AP device to be scanned is counted (the maximum time interval that the STA device receives the PPDUs sent by the AP device twice in succession).
  • the content of the timetable of the peripheral AP device CSI can be as shown in Table 1.
  • the CSI acquisition module receives the PPDU sent by the AP i device on the channel CH j , and the time when the PPDU sent by the AP device is received last time in the last statistical period is t 1 * , in this statistics.
  • the PPDU sent by the AP device is received twice, and the time is t 2 , t 3 respectively.
  • the maximum time interval that the APi device is scanned in this statistical period is ⁇ t 2 -t 1 * , t 3 -t 2 The maximum value in ⁇ . If, at the end of the current statistical period, the AP device is found in the CSI acquisition time interval table of the neighboring AP device, and the maximum time interval for the AP device to be scanned is greater than T req , the AP devices are added to the working channel according to the working channel.
  • An active scan channel table the contents of the active scan channel table can be as shown in Table 2.
  • Table 2 The contents in Table 2 indicate that in this statistical period, the maximum time interval between two and one AP devices scanned on the channels CH j and CH j+1 respectively is greater than the expected maximum acquisition time interval.
  • the CSI acquisition module For each channel that appears in the active scan channel table, the CSI acquisition module takes the active scanning mode to obtain CSI, that is, performs an active scan on these channels every T req time.
  • the active scan channel table begins to record, the CSI acquisition module maintains a counter whose initial value is set to T req /T 1round . Thereafter, the value of the counter is decremented by one each time a CSI acquisition process is performed. Whenever the counter value is equal to 1, then in the current round of CSI acquisition, when the first list is scanned channel by channel, if the current channel appears in the active scan channel table, the CSI acquisition module immediately indicates that the STA device is in the current channel.
  • the active broadcast can trigger the request frame of the AP device to send the corresponding response frame on the channel (if there is only one AP device on the channel in the active scan channel table, the request frame can also be unicast to the AP device), and then the received response frame is received.
  • the CSI is extracted from the PPDU, thereby accelerating the CSI acquisition frequency of the AP device on the channel.
  • the counter value returns to N. It should be noted that the above process is repeatedly performed to ensure that the CSI acquisition time interval to the neighboring APs is not greater than T req .
  • the CSI obtaining module may instruct the STA device to trigger the AP device to send a probe response frame by broadcasting or unicasting an 802.11 probe request frame (English: Probe Request Frame) on a channel appearing in the active scan channel table. : Probe Response Frame) to extract CSI information from the probe response frame.
  • 802.11 probe request frame English: Probe Request Frame
  • Probe Response Frame 802.11 probe request frame
  • the corresponding record in the CSI acquisition time table of the foregoing neighboring AP device is not updated. Otherwise, the corresponding AP device disappears from the active scan channel table, and the CSI acquisition module does not use the active scan mode for the AP.
  • the AP device that can be scanned previously may not be able to continue scanning due to the distance becoming far.
  • the AP device enters the active scanning channel table, and the STA device to be located continues to send the request frame to trigger the response frame in the subsequent CSI acquisition process.
  • the STA device to be located does not receive the response frame returned by the corresponding AP device after transmitting the request frame by using the active scanning mechanism multiple times (for example, 3 times), the corresponding AP will be received.
  • the device is removed from the active scan channel list.
  • the CSI obtaining module may feed back a CSI notification message that is generated by the group of CSIs and carries the MAC address of the AP device to the service requesting program. Therefore, based on the implementations shown in FIG. 2, FIG. 5, and FIG. 8, FIG. 2 can be used as an implementation as shown in FIG.
  • the CSI obtaining module sends the set of CSIs to the service requesting program through the asynchronous notification interface, which may be specifically implemented as step 1031 and step 1032:
  • the CSI obtaining module When a group of CSIs is collected, the CSI obtaining module generates a CSI notification message corresponding to the group of CSIs.
  • the CSI notification message includes a MAC address and a content of the CSI, and the MAC address is a MAC address of the AP device that sends the PPDU carrying the CSI.
  • the CSI obtaining module sends a CSI notification message to the service requesting program.
  • a CSI notification message can be formed immediately and passed to the service caller, that is, the service request, through the CSI asynchronous notification interface.
  • the CSI notification message includes the following content:
  • the information and the specific expression format included in the CSI may be defined by the format of the “CSI Report” field in the CSI frame defined by the 802.11 standard.
  • the CSI acquisition module should feed back the CSI notification message to the service requesting program by requesting the request message sent by the requesting program. That is to say, the CSI acquisition module and the service requesting program perform data transmission of the CSI in an asynchronous manner, and then the service requesting program can implement the call of the CSI according to the CSI notification message.
  • the embodiment of the present invention may divide the function module by using the CSI acquiring device according to the foregoing method example.
  • each functional unit may be divided according to each function, or two or more functions may be integrated into one processing unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 10 is a schematic diagram showing a possible structure of a CSI acquiring apparatus involved in the foregoing embodiment, where the CSI obtaining apparatus includes: a receiving unit, a processing unit, and a sending unit.
  • the receiving unit is configured to support the CSI acquiring apparatus to execute the process 101 in FIG. 2 and the process 107 in FIG.
  • the processing unit is configured to support the CSI acquisition device to perform the process 102 of FIG. 2, the process 104 of FIG. 3, the process 1021 and the process 1022 of FIG. 4, the process 105 of FIG. 5, and the process 106 of FIG.
  • the transmitting unit is configured to support the CSI acquiring apparatus to perform the process 103 in FIG. 2, the process 108 in FIG. 8, the process 1031 in FIG. 9, and the process 1032. All the related content of each step involved in the foregoing method embodiments may be referred to the functional description of the corresponding functional unit, and details are not described herein again.
  • FIG. 10 shows a possible structural diagram of the CSI acquiring apparatus involved in the above embodiment.
  • the CSI obtaining means 20 includes a receiving unit 21, a processing unit 22, and a transmitting unit 23.
  • the receiving unit 21 and the transmitting unit 23 are configured to support communication between the CSI acquiring device and the service requesting program.
  • the processing unit 22 is configured to control and manage the actions of the CSI acquiring device.
  • the processing unit 22 is configured to support the CSI acquiring device to perform the process 102 in FIG. 2, the process 104 in FIG. 3, the process 1021 in FIG. 4, and the process 1022.
  • the terminal may further include a storage unit 23 for storing program codes and data of the base station.
  • the processing unit 22 may be a processor or a controller, for example, a central processing unit (English: Central Processing Unit, CPU for short), a general-purpose processor, and a digital signal processor (English: Digital Signal Processor, referred to as DSP). , Application-Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or random combination. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the receiving unit 21 and the transmitting unit 23 can be implemented by a communication module, which can be specifically a transceiver, a transceiver circuit or a communication interface.
  • the storage unit 23 can be a memory.
  • the processing unit 22 is a processor
  • the storage unit 23 is a memory
  • the CSI acquiring apparatus according to the embodiment of the present invention may be the CSI acquiring apparatus shown in FIG.
  • the CSI obtaining apparatus 30 includes a processor 31, a communication interface 32, a memory 33, and a bus 34.
  • the processor 31, the communication interface 32, and the memory 33 are connected to each other through a bus 34.
  • the bus 34 may be a Peripheral Component Interconnect (PCI) bus or an extended industry standard structure (English: Extended) Industry Standard Architecture, referred to as EISA) bus.
  • PCI Peripheral Component Interconnect
  • EISA Extended Industry Standard Architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 11, but it does not mean that there is only one bus or one type of bus.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, and the software modules may be stored in a random access memory (English: Random Access Memory, RAM for short), flash memory, read only memory (English: Read Only Memory, referred to as: ROM), Erase programmable read-only memory (English: Erasable Programmable ROM, referred to as: EPROM), electrically erasable programmable read-only memory (English: Electrically EPROM, referred to as: EEPROM), registers, hard disk, mobile hard disk, read-only optical disk (referred to as : CD-ROM) or any other form of storage medium known in the art.
  • ROM Random Access Memory
  • EPROM Erasable Programmable ROM
  • EEPROM electrically erasable programmable read-only memory
  • registers hard disk, mobile hard disk, read-only optical disk (referred to as : CD-ROM)
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

本发明公开了一种基于802.11网络的CSI获取方法及装置，涉及通信技术领域，能够针对定位需求提出一种CSI的获取机制，以通过为终端提供更加全面的CSI来实现提高终端定位过程准确率的目的。本发明的方法包括：CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息；CSI获取模块在监听信道列表中记载的所有待监听信道上，按照信道停留监听时间，从目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI；当采集到一组CSI时，CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI。本发明适用于CSI的采集过程。

Description

一种基于802.11网络的CSI获取方法及装置
本申请要求于2016年11月18日提交中国专利局、申请号为201611031771.2、申请名称为“一种基于802.11网络的CSI获取方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，尤其涉及一种基于802.11网络的CSI(英文：Channel State Information，中文：信道状态信息)获取方法及装置。
背景技术
随着通信技术的发展，尤其是定位技术的普及，考虑到在发射机位置固定时，接收机与周边多个发射机之间的CSI与接收机的位置在理论上存在一对一的映射关系，因此，在对待定位终端进行定位的过程中，可以通过采集终端所在位置的CSI，来确定终端所处的位置，从而达到为终端进行定位的效果。
在802.11中，每当STA(英文：Station，中文：站点)设备从空口中接收一个PPDU(英文：Physical-layer Protocol Data Unit，中文：物理层协议数据单元)时，物理层都会通过对PPDU前导序列的处理，来获得发射机与自身之间的CSI。其中，CSI包含了发射机和作为接收机的终端之间的信道，对无线数据信号幅度和相位的影响信息，接收机可据此对接收到的数据信号进行相应的补偿和纠正，以提高数据信号信噪比和解调质量。但是，在802.11中，CSI与数据接收过程紧耦合，仅被PPDU解调过程内部使用，而无法供诸如上层应用程序等的服务请求程序用于终端定位过程。
另外，定位应用与数据传输应用相比，对CSI的获取需求存在较大差异。在数据传输应用中，STA设备的典型工作方式是首先加入一个802.11AP(英文：Access Point，中文：访问接入点)设备创建的网络，之后一直保持在该AP设备工作的信道上进行数据收发。在此过程中，该STA设备只能检测和接收到在其当前工作信道上出现的PPDU。
由此可见，采用现有技术所提供的技术方案虽然能完成CSI的采集，但所采集到的CSI无法应用于定位应用，也就无法实现依据所采集的CSI来完成终端定位过程。并且，所采集到的CSI具有较大局限性，即仅包括终端当前所处信道上的AP设备与该终端之间的CSI。因此，上述CSI获取方案无法为终端定位提供较为全面的CSI，降低了终端定位过程的准确率。
发明内容
本发明提供一种基于802.11网络的CSI获取方法及装置，能够针对定位需求提出一种CSI的获取机制，以通过为终端提供更加全面的CSI来实现提高终端定位过程准确率的目的。
为达到上述目的，本发明实施例采用如下技术方案：
一方面，本发明提供一种基于802.11网络的CSI获取方法，该方法用于一种802.11 网络中的STA设备。该STA设备设置有CSI获取模块和运行在STA设备上的服务请求程序，该服务请求程序与CSI获取模块之间能够通过服务请求接口与异步通知接口进行数据传输。方法包括：CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息，该请求消息中至少包括监听信道列表、信道停留监听时间和目标AP设备列表，该监听信道列表中记载了待监听频带，以及与每个待监听频带对应的待监听信道，该信道停留监听时间为CSI获取模块在单个信道上监听目标AP设备发送的PPDU并从中提取CSI的时间；CSI获取模块在监听信道列表中记载的所有待监听信道上，按照信道停留监听时间，从目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI；当采集到一组CSI时，CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI，其中，这一组CSI用于表示采集到的同一PPDU所携带的CSI。由此可见，本发明所提供的服务请求接口与异步通知接口能够实现应诸如上层应用程序等的服务请求程序所提出的CSI采集请求，采集STA设备与周边满足要求的AP设备之间的CSI。这样一来，就能够针对定位需求为STA设备及时提供更加全面的CSI，从而提高终端定位过程的准确率。
在一种可能的设计中，监听信道列表中可能未记载任何内容。那么，在CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息之后，CSI获取模块可以直接在STA设备当前所处信道上，从目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI，从而提高了CSI的获取效率和质量。
在一种可能的设计中，CSI获取模块从目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI，具体可以实现为：CSI获取模块从接收到的PPDU中获取发送PPDU的AP设备的MAC地址，并当MAC地址为目标AP设备的MAC地址时，CSI获取模块直接从PPDU中提取CSI，从而确保所采集到的CSI为STA设备所需的CSI，提高CSI的获取效率和质量。
在一种可能的设计中，目标AP设备列表中可能未记载任何内容，或者目标AP设备列表中存在至少一个表示目标AP设备的MAC地址为特殊预设值，该特殊预设值不代表任何目标AP设备的MAC地址。那么，在CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息之后，CSI获取模块需要在监听信道列表中记载的所有待监听信道上，按照信道停留监听时间，从所有接收到的PPDU中提取CSI，从而确保CSI获取模块仍然能够顺利完成CSI的获取操作。
在一种可能的设计中，请求消息中还可以包括总监听时间。那么，在CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI之后，当在每个待监听信道上进行监听的时间之和小于总监听时间时，CSI获取模块可以按照信道停留监听时间，继续在待监听信道上接收所有目标AP设备发送的PPDU并提取CSI。也就意味着，如果在当前信道上的停留时间没有超出信道停留监听时间，则在当前信道上继续监听并获取CSI；否则，将STA设备监听的信道切换至信道监听列表中当前信道的下一信道进行监听，并完成下一信道的CSI获取过程。当完成对信道监听列表中最后一个待监听信道的CSI获取过程之后，CSI获取模块指示STA设备将工作信道切换到信道监听列表的第一个待监听信道开始下一轮CSI获取过程。上述CSI获取过程重复进行，直到CSI获取模块收到CSI服务请求程序发送的“停止获取CSI”的终止CSI采集消息， CSI获取模块停止CSI获取过程，或是直至监听的总时间达到总监听时间。
在一种可能的设计中，服务请求接口具体可以包括第一服务请求接口和第二服务请求接口，CSI获取模块能够通过第一服务请求接口接收服务请求程序发送的请求消息；并在CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI之后，通过第二服务请求接口接收服务请求程序发送的终止CSI采集消息，并终止CSI采集过程。
在一种可能的设计中，由于在不同的定位方案中，对于待定位STA与周边AP设备间CSI的获取时间间隔有不同要求。因此，为了确保CSI采集过程中，采集间隔满足CSI获取服务请求应用的需求，请求消息还可以包括最大CSI获取间隔。那么，在采集到一组CSI之后，当在最大CSI获取间隔之内未采集到与这一组CSI属于同一AP设备的下一组CSI时，CSI获取模块向同一AP设备所在信道内的每个AP设备广播请求报文，以便于同一AP设备所在信道内的每个AP设备向CSI获取模块发送应答报文；CSI获取模块从应答报文中提取CSI。
在一种可能的设计中，CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI，可以具体实现为：CSI获取模块生成这一组CSI对应的CSI通知消息，该CSI通知消息包括MAC地址和这一组CSI的内容，该MAC地址为发送携带有这一组CSI的PPDU的AP设备的MAC地址；CSI获取模块向服务请求程序发送CSI通知消息，以便于服务请求程序可以根据CSI通知消息，来实现这一组CSI的调用。
另一方面，本发明提供一种基于802.11网络的CSI获取装置，该装置可以实现上述方法示例中CSI获取模块所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。
在一种可能的设计中，该装置的结构中包括处理器和通信接口，该处理器被配置为支持该装置执行上述方法中相应的功能。该通信接口用于支持该装置与其他设备之间的通信。该装置还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
本发明在802.11网络中的STA设备上设置了服务请求接口与异步通知接口，这两个接口能够实现服务请求程序与CSI获取模块之间的数据传输。CSI获取模块能够通过服务请求接口接收到请求服务程序发送的请求消息，这个请求消息中至少包括了监听信道列表、信道停留监听时间和目标AP设备列表，之后CSI获取模块能够根据上述参数锁定待监听信道，并依照信道停留监听时间所规定的时间，在待监听信道上监听目标AP设备发送的PPDU，并从该PPDU中提取CSI。并且，当采集到一组CSI时，CSI获取模块可以通过异步通知接口向服务请求程序及时反馈这一组CSI。由此可见，本发明所提供的服务请求接口与异步通知接口能够实现应诸如上层应用程序等的服务请求程序所提出的CSI采集请求，采集STA设备与周边满足要求的AP设备之间的CSI。这样一来，就能够针对定位需求为STA设备及时提供更加全面的CSI，从而提高终端定位过程的准确率。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获 得其它的附图。
图1为本发明实施例提供的一种上层应用程序与CSI获取模块之间的数据交互结构图；
图2为本发明实施例提供的一种基于802.11网络的CSI获取方法流程图；
图3至图9为本发明实施例提供的另一种基于802.11网络的CSI获取方法流程图；
图10为本发明实施例提供的一种基于802.11网络的CSI获取装置的结构示意图；
图11为本发明实施例提供的另一种基于802.11网络的CSI获取装置的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
本发明实施例可以用于一种802.11网络通信系统，该系统中至少包括STA设备和AP设备。如图1所示，STA设备设置有CSI获取模块和运行在STA设备上的服务请求程序。其中，服务请求程序可以通过CSI获取服务请求接口向CSI获取模块发送请求消息，比如“开始获取CSI”的请求消息；CSI获取模块可以通过异步通知接口向服务请求程序发送一组CSI。需要说明的是，服务请求接口可以包括第一服务请求接口和第二服务请求接口，之后服务请求程序可以通过第一服务请求接口向CSI获取模块发送请求消息，还可以通过第二服务请求接口向CSI获取模块发送诸如“停止获取CSI”的终止CSI采集消息。
本发明实施例提供一种基于802.11网络的CSI获取方法，如图2所示，该方法可以应用于一种802.11STA设备，即802.11网络通信系统中的STA设备，该方法流程包括：
101、CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息。
其中，请求消息中至少包括监听信道列表、信道停留监听时间和目标AP设备列表，监听信道列表中记载了待监听频带，以及与每个待监听频带对应的待监听信道，信道停留监听时间为CSI获取模块在单个信道上监听目标AP设备发送的PPDU并从中提取CSI的时间。
需要说明的是，802.11标准在2.4GHz、5GHz、60GHz等多个频段(英文：band)，每个频段上定义了多个信道(英文：channel),而在不同的国家和地域，因无线电管制规定的差异，实际可用的信道列表也不同。同时，部分定位应用中，待定位的STA设备可通过一些技术手段(比如通过向专用服务器查询)事先获知环境中各AP设备的工作信道。因此，上述监听信道列表可以指示在获取CSI的过程中需要监听的信道，CSI获取模块接收到请求消息后，可根据监听信道列表，指示STA设备在列表给出的每个信道上逐一停留监听并接收空口中出现的周边AP设备发送的PPDU，并从中提取CSI。通过在请求消息中提供监听信道列表，可以避免STA设备在一些不会出现AP设备的信道上进行无效监听，从而提高CSI获取效率。
另外，考虑到作为服务调用者的服务请求程序可能对需要采集的CSI的来源有不 同的要求，例如部分定位应用中，待定位的STA设备可通过一些技术手段(比如通过服务器查询)事先获知环境中各AP设备的工作参数信息，比如AP设备的MAC地址、工作频段、工作信道、周期性发送帧(比如信标帧或其它帧)的发送频率等信息，因而可在获取与周边各AP设备之间的CSI时，对想要收集的目标AP设备进行指定，以提高CSI收集效率或收集质量，因此，在请求消息中可以携带有目标AP设备列表。
CSI获取模块收到请求消息后，立即开始CSI获取过程。需要说明的是，STA设备并不需要为执行CSI获取任务而加入任何AP设备创建的网络，而是立即开始执行信道监听，并对空口出现的PPDU进行接收、处理，从中提取CSI获取模块所在STA设备与发送PPDU的AP设备之间的CSI。
需要说明的是，信道停留监听时间可以被视为用于指示CSI获取模块在单个信道上监听AP设备发送的PPDU并从中提取CSI的时间。信道停留监听时间是针对每一条被监听的信道而言的监听时间，在本发明实施例中，为了确保监听过程中对每一条待监听信道都有统一的监听机制，因此，每条待监听信道的信道停留监听时间可以相同。
102、CSI获取模块在监听信道列表中记载的所有待监听信道上，按照信道停留监听时间，从目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI。
在PPDU中，前导序列中的短训练字段(英文：Short Training Field，简称：STF)和长训练字段(英文：Long Training Field，简称：LTF)都是一段预定义的固定符号序列。本发明实施例中，可以通过对PPDU前导序列中的LTF进行处理，来获取CSI。
需要特别指出的是，802.11中包括多种不同的体制，比如：802.11b/g/a/n/ac等，前导序列中的LTF格式、数量，以及传输时占用的带宽是不同的。因此，在CSI的提取过程中，需要针对不同的PPDU来进行不同的处理，在此不做赘述。需要说明的是，LTF的传输带宽越宽，相应获取的CSI的时间分辨率越高，越有助于提高定位精度；LTF的数量越多，相应获取的CSI包含的空间流数越多，意味着更好的空间分辨率和更高的定位精度。
为了在STA设备移动过程中能够进行实时定位，STA设备需要能够从周边AP设备持续获取CSI，即能够周期性接收到周边AP设备发送的PPDU。在802.11中至少存在两种周期性发送的管理帧可用于获取CSI，即信标帧(英文：Beacon Frame)和测量导频帧(英文：Measurement Pilot Frame)。对于信标帧而言，在802.11的BSS(英文：Basic Service Set，中文：基本服务集运营支持系统)网络中的AP设备必须周期广播信标帧。默认情况下该帧的广播周期为100ms。对于测量导频帧而言，该帧为802.11中定义的一种射频测量帧，用于协助需要接入Wi-Fi(英文：Wireless Fidelity，中文：无线局域网)网络的STA设备快速完成网络扫描，该帧是一种可选帧，帧内所含信息是信标帧的子集，该帧长度较小，但广播频率高于信标帧。一般情况下，该帧的广播周期可以配置为信标帧间隔的3％至50％。需要说明的是，从AP设备发出的所有802.11帧对应的PPDU中，STA设备上的CSI获取模块都可以提取CSI，即本发明实施例中所接收的PPDU除了可以为上述管理帧以外，还可以为802.11中其他目前已有的所有帧，或是未来可能出现在802.11中的帧对应的PPDU，并从中提取CSI。
103、当采集到一组CSI时，CSI获取模块通过异步通知接口向服务请求程序发送 这一组CSI。
其中，这一组CSI用于表示采集到的同一PPDU所携带的CSI。
需要说明的是，CSI包含的信息和具体表达格式可采用802.11标准定义的CSI帧(英文：CSI frame)中“CSI Report”字段的格式定义。
为了确保CSI能够实时的从CSI获取模块反馈至服务请求程序，在本发明实施例中，可以在完成同一PPDU所携带的CSI的采集过程之后，就将所采集到的这一组CSI立即向服务请求程序发送，以确保CSI能够尽快反馈到服务请求程序。
本发明所提供的服务请求接口与异步通知接口能够实现应诸如上层应用程序等的服务请求程序所提出的CSI采集请求，采集STA设备与周边满足要求的AP设备之间的CSI。这样一来，就能够针对定位需求为STA设备及时提供更加全面的CSI，从而提高终端定位过程的准确率。
考虑到在请求消息中可能存在监听信道列表为空的情况，在本发明实施例的一个实现方式中，当所述监听信道列表中未记载任何内容时，CSI获取模块可以直接从STA设备当前所处信道上对目标AP设备列表中所记载的目标AP设备进行监听，并从这些目标AP设备发送的PPDU中提取CSI。因此，在如图2所示的实现方式的基础上，还可以实现为如图3所示的实现方式。其中，在执行步骤101CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息之后，可以执行步骤104：
104、CSI获取模块在STA设备当前所处信道上，从目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI。
在本发明中，由于监听信道列表并未记载任何内容，因此，CSI获取模块可以仅监听STA设备当前所处信道，并依据目标AP设备列表来完成目标AP设备的监听。也就意味着，STA设备可以仅从STA设备当前所处信道上接收的PPDU中提取CSI，提高了CSI的获取效率和质量。
在本发明实施例的一个实现方式中，提供了一种具体用于从指定PPDU中提取CSI的方法。在如图2所示的实现方式的基础上，还可以实现为如图4所示的实现方式。其中，步骤102CSI获取模块在监听信道列表中记载的所有待监听信道上，按照信道停留监听时间，从目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI，可以具体实现为步骤1021和步骤1022：
1021、CSI获取模块在监听信道列表中记载的所有待监听信道上，按照信道停留监听时间，从接收到的PPDU中获取发送PPDU的AP设备的MAC(英文：Media Access Control，中文：媒体访问控制)地址。
1022、当MAC地址为目标AP设备的MAC地址时，CSI获取模块从PPDU中提取CSI。
CSI获取模块在监听到PPDU时，可以对PPDU进行解调解码，从而获取到PPDU中所携带的MAC地址。如果MAC地址被记载在第二列表中，则认为该MAC地址对应的AP设备为待监听AP设备，则从该PPDU中提取CSI。
在本发明中，能够使STA设备在采集CSI的过程中，可根据请求消息中所携带的第二列表中记载的待监听AP设备，来确定待监听信道中哪些AP设备发送的PPDU可以用于提取CSI，并当监测到的PPDU为待监听AP设备发送的消息时，从该PPDU 中提取CSI，从而确保所采集到的CSI为STA设备所需的CSI，提高CSI的获取效率和质量。
为了确保当请求消息中所携带的目标AP列表为空，或是在目标AP列表中记载有特殊预设值时，其中，特殊预设值不代表任何目标AP设备的MAC地址，CSI获取模块仍然能够顺利完成CSI的获取操作，在本发明实施例的一个实现方式中，在如图4所示的实现方式的基础上，还可以实现为如图5所示的实现方式。其中，在执行步骤101CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息之后，还可以执行步骤105：
105、CSI获取模块在监听信道列表中记载的所有待监听信道上，按照信道停留监听时间，从所有接收到的PPDU中提取CSI。
在本发明中，如果请求消息中所携带的目标AP列表为空，CSI获取模块可以依据监听信道列表中所记载的内容，在信道停留监听时间所规定的时间内，从每个待监听信道上所接收的PPDU中直接提取CSI。
在本发明实施例的一个实现方式中，如果在当前信道上的停留时间没有超出信道停留监听时间，则在当前信道上继续监听并获取CSI；否则，将STA设备监听的信道切换至信道监听列表中当前信道的下一信道进行监听，并完成下一信道的CSI获取过程。当完成对信道监听列表中最后一个待监听信道的CSI获取过程之后，CSI获取模块指示STA设备将工作信道切换到信道监听列表的第一个待监听信道开始下一轮CSI获取过程。上述CSI获取过程重复进行，直到CSI获取模块收到CSI服务请求程序发送的“停止获取CSI”的终止CSI采集消息，CSI获取模块停止CSI获取过程，或是直至监听的总时间达到总监听时间。因此，针对重复进行监听的过程而言，在如图2所示的实现方式的基础上，还可以实现为如图6所示的实现方式。其中，在执行完步骤103当采集到一组CSI时，CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI之后，还可以执行步骤106：
106、当在每个待监听信道上进行监听的时间之和小于总监听时间时，CSI获取模块按照信道停留监听时间，继续在待监听信道上接收所有目标AP设备发送的PPDU并提取CSI。
在本发明实施例的一个实现方式中，服务请求接口可以包括第一服务请求接口和第二服务请求接口，其中，第一服务请求接口用于接收服务请求程序发送的请求消息，第二服务请求接口用于接收服务请求程序发送的终止CSI采集过程的消息。在如图2或如图6所示的实现方式的基础上，以图2为例，还可以实现为如图7所示的实现方式。其中，步骤101CSI获取模块通过服务请求接口接收服务请求程序发送的请求消息，可以具体实现为步骤1011；在执行步骤103当采集到一组CSI时，CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI之后，还可以执行步骤107：
1011、CSI获取模块通过第一服务请求接口接收服务请求程序发送的请求消息。
107、CSI获取模块通过第二服务请求接口接收服务请求程序发送的终止CSI采集消息，并终止CSI采集过程。
在不同的定位方案中，对于待定位STA与周边AP设备间CSI的获取时间间隔有不同要求。为了确保CSI采集过程中，采集间隔满足CSI获取服务请求应用的需求， 在本发明实施例的一个实现方式中，请求消息还可以携带有最大CSI获取间隔，在如图2所示的实现方式的基础上，还可以实现为如图8所示的实现方式。其中，在执行完步骤103当采集到一组CSI时，CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI之后，还可以执行步骤108和步骤109：
108、当在最大CSI获取间隔之内未采集到与这一组CSI属于同一AP设备的下一组CSI时，CSI获取模块向同一AP设备所在信道内的每个AP设备广播请求报文。
这样一来，同一AP设备所在信道内的每个AP设备都会向CSI获取模块发送应答报文，之后CSI获取模块就能够从应答报文中完成CSI的提取，从而保证当前定位方案对于CSI的获取时间间隔的需求。
109、CSI获取模块从应答报文中提取CSI。
为了确保CSI采集过程中，采集间隔满足CSI获取服务请求应用的需求，在本发明中，请求消息还可以携带有期望最大CSI采集间隔(以下将其标识为Treq)，也就是上述最大CSI获取间隔。当CSI获取模块发现被获取CSI的某一AP设备发送PPDU的最大时间间隔大于Treq时，可通过主动信道扫描机制来主动触发相应AP设备发送PPDU，从而能每隔Treq获取到至少一次与该AP设备间的CSI。
如前文所述，本发明中请求消息中包含信道监听列表和信道停留监听时间(以下标识为Tlinger)，在每轮CSI获取过程中，CSI获取模块需要指示STA设备按信道监听列表中指定的各个待监听信道，在每个待监听信道上停留Tlinger时间。例如：信道监听列表中包含Nch个信道，则每轮CSI获取过程需耗时T1round＝Tlinger*Nch，以下将T1round称作CSI基本获取周期，该基本获取周期所表示的时长是CSI获取模块获取CSI时能够实现的最小时间间隔。需要说明的是，请求消息中携带的Treq需要是T1round的整数倍。
以下对通过主动信道扫描机制，确保CSI获取模块获取CSI的时间间隔不大于请求消息中携带的期望最大CSI获取时间间隔的具体实现方式进行描述：
首先定义待定位的STA设备与周边AP设备之间CSI获取时间间隔的统计周期(以下标识为Tstat)，Tstat的长度可设置为Treq的整数倍。
在CSI获取过程中，当CSI获取模块指示STA设备按信道监听列表逐信道扫描获取CSI时，CSI获取模块维护一个周边AP设备CSI获取时刻表，并按Tstat为周期更新表中信息。表中记录着在本统计周期中，扫描到的各个AP设备(STA设备接收到AP设备发送的PPDU，即认为扫描到AP设备)的信道，以及每次扫描到各个AP设备的时刻，并在本统计周期结束时，统计各个AP设备被扫描到的最大时间间隔(STA设备连续两次收到该AP设备所发送的PPDU的最大时间间隔)。周边AP设备CSI获取时刻表内容可以如表一所示。
表一
Figure PCTCN2017111309-appb-000001
Figure PCTCN2017111309-appb-000002
表一中“被扫描到的时刻”一列中，记录了AP设备在上一统计周期最后一次，以及在本统计周期被扫描到的时刻，按先后顺序排列；“统计周期内被扫描到的最大时间间隔”一列根据前述时刻计算得到。例如：在表一中，CSI获取模块在信道CHj上收到APi设备发出的PPDU，且在上一统计周期最后一次收到该AP设备发出的PPDU的时刻是t1 *，在本统计周期两次收到该AP设备发出的PPDU，时刻分别是t2,t3，则APi设备在本统计周期内被扫描到的最大时间间隔为{t2-t1 *,t3-t2}中的最大值。如果在本统计周期结束时刻，发现周边AP设备CSI获取时间间隔表中存在AP设备，且该AP设备被扫描到的最大时间间隔大于Treq，则将这些AP设备按各自所处工作信道添加到一张主动扫描信道表，主动扫描信道表内容可以如表二所示。
表二
信道 AP设备标识
CHj APi，APi+1
CHj+1 APi+2
表二中的内容表示在本统计周期中，在信道CHj和CHj+1上分别存在两个和一个AP设备被扫描到的最大时间间隔大于期望最大采集时间间隔。
对于主动扫描信道表中出现的每个信道，CSI获取模块采取主动扫描方式获取CSI，即每隔Treq时间会对这些信道执行一次主动扫描。在主动扫描信道表开始出现记录时，CSI获取模块维护一个计数器，计数器初值设为Treq/T1round。此后，每经过一轮CSI获取过程，该计数器的值减一。每当该计数器值等于1时，则在当前这轮CSI获取过程中，按第一列表逐信道扫描时，如果当前信道出现在主动扫描信道表中，则CSI获取模块立即指示STA设备在当前信道主动广播能够触发该信道上AP设备发送相应响应帧的请求帧(如果主动扫描信道表中该信道上只有一个AP设备，也可向该AP设备单播请求帧)，进而从接收的作为响应帧的PPDU中提取CSI，从而加快对该信道上AP设备的CSI获取频率。当本轮CSI获取过程结束时，计数器值恢复为N。需要说明的是，上述过程重复执行，即可确保对周边AP的CSI获取时间间隔不大于Treq。
例如：CSI获取模块可指示STA设备，通过在主动扫描信道表中出现的信道上广播或向特定AP设备单播802.11探测请求帧(英文：Probe Request Frame)，触发AP设备发送探测响应帧(英文：Probe Response Frame)，以从该探测响应帧中提取CSI信息。
需要注意的是，当采用主动扫描方式接收到相应AP设备发送的PPDU时，并不更新前述周边AP设备CSI获取时刻表中的相应记录。否则，会导致相应AP设备从主动扫描信道表中消失，进而导致CSI获取模块不再对该AP采用主动扫描方式。
此外，当待定位终端处于持续移动过程中时，此前能被扫描到的AP设备可能因距离变远而无法继续扫描到。在前述主动扫描机制中，这类AP设备会进入主动扫描信道表，导致待定位的STA设备在随后的CSI获取过程中，持续无谓地发送请求帧去触发应答帧。为避免这种情况出现，如果待定位的STA设备连续多次(例如3次)采用主动扫描机制发送请求帧后，都没有收到相应AP设备返回的应答帧，则将相应AP 设备从主动扫描信道表中移除。
在本发明实施例的一个实现方式中，当采集到一组CSI时，CSI获取模块可以将根据这一组CSI生成的携带有AP设备的MAC地址的CSI通知消息反馈至服务请求程序。因此，在如图2、图5、图8所示的实现方式的基础上，以图2为例，还可以实现为如图9所示的实现方式。其中，步骤103当采集到一组CSI时，CSI获取模块通过异步通知接口向服务请求程序发送这一组CSI，可以具体实现为步骤1031和步骤1032：
1031、当采集到一组CSI时，CSI获取模块生成这一组CSI对应的CSI通知消息。
其中，CSI通知消息包括MAC地址和这一组CSI的内容，MAC地址为发送携带有这一组CSI的PPDU的AP设备的MAC地址。
1032、CSI获取模块向服务请求程序发送CSI通知消息。
在监听过程中，CSI获取模块每获取到与某个AP设备之间的一组CSI时，则可以立即形成CSI通知消息，并通过CSI异步通知接口将其传递给服务调用者，即服务请求。在本发明实施例中，CSI通知消息包含以下内容：
<发送端AP设备的MAC地址、CSI>
其中，CSI包含的信息和具体表达格式可采用802.11标准定义的CSI帧中“CSI Report”字段的格式定义。
在本发明中，CSI获取模块应服务请求程序发送的请求消息，向服务请求程序反馈CSI通知消息。也就意味着，CSI获取模块与服务请求程序之间通过异步的方式，将这一组CSI进行数据传输，之后服务请求程序可以根据CSI通知消息，来实现这一组CSI的调用。
本发明实施例可以根据上述方法示例对CSI获取装置进行功能模块的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本发明实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用对应各个功能划分各个功能单元的情况下，图10示出了上述实施例中所涉及的CSI获取装置的一种可能的结构示意图，CSI获取装置包括：接收单元、处理单元和发送单元。接收单元用于支持CSI获取装置执行图2中的过程101、图7中的过程107。处理单元用于支持CSI获取装置执行图2中的过程102、图3中的过程104、图4中的过程1021和过程1022、图5中的过程105、图6中的过程106。发送单元用于支持CSI获取装置执行图2中的过程103、图8中的过程108、图9中的过程1031和过程1032。其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能单元的功能描述，在此不再赘述。
在采用集成的单元的情况下，图10示出了上述实施例中所涉及的CSI获取装置的一种可能的结构示意图。CSI获取装置20包括：接收单元21、处理单元22和发送单元23。接收单元21、发送单元23用于支持CSI获取装置与服务请求程序的通信。处理单元22用于对CSI获取装置的动作进行控制管理，例如，处理单元22用于支持CSI获取装置执行图2中的过程102、图3中的过程104、图4中的过程1021和过程1022、图5中的过程105、图6中的过程106，和/或用于本文所描述的技术的其它过程。终 端还可以包括存储单元23，用于存储基站的程序代码和数据。
其中，处理单元22可以是处理器或控制器，例如可以是中央处理器(英文：Central Processing Unit，简称：CPU)，通用处理器，数字信号处理器(英文：Digital Signal Processor，简称：DSP)，专用集成电路(英文：Application-Specific Integrated Circuit，简称：ASIC)，现场可编程门阵列(英文：Field Programmable Gate Array，简称：FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。接收单元21和发送单元23可以由一个通信模块来实现其具有的功能，该通信模块具体可以是收发器、收发电路或通信接口等。存储单元23可以是存储器。
当接收单元21、发送单元23为通信接口，处理单元22为处理器，存储单元23为存储器时，本发明实施例所涉及的CSI获取装置可以为图11所示的CSI获取装置。
参阅图11所示，该CSI获取装置30包括：处理器31、通信接口32、存储器33以及总线34。其中，处理器31、通信接口32，以及存储器33通过总线34相互连接；总线34可以是外设部件互连标准(英文：Peripheral Component Interconnect，简称：PCI)总线或扩展工业标准结构(英文：Extended Industry Standard Architecture，简称：EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图11中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
结合本发明公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(英文：Random Access Memory，简称：RAM)、闪存、只读存储器(英文：Read Only Memory，简称：ROM)、可擦除可编程只读存储器(英文：Erasable Programmable ROM，简称：EPROM)、电可擦可编程只读存储器(英文：Electrically EPROM，简称：EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(简称：CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于核心网接口设备中。当然，处理器和存储介质也可以作为分立组件存在于核心网接口设备中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。

Claims (16)

  1. 一种基于802.11网络的CSI获取方法，其特征在于，所述方法用于一种802.11网络中的站点STA设备，所述STA设备设置有信道状态信息CSI获取模块和运行在所述STA设备上的服务请求程序，所述服务请求程序与所述CSI获取模块之间能够通过服务请求接口与异步通知接口进行数据传输，所述方法包括：
    所述CSI获取模块通过所述服务请求接口接收所述服务请求程序发送的请求消息，所述请求消息中至少包括监听信道列表、信道停留监听时间和目标接入点AP设备列表，所述监听信道列表中记载了待监听频带，以及与每个待监听频带对应的待监听信道，所述信道停留监听时间为所述CSI获取模块在单个信道上监听目标AP设备发送的物理层协议数据单元PPDU并从中提取CSI的时间；
    所述CSI获取模块在所述监听信道列表中记载的所有待监听信道上，按照所述信道停留监听时间，从所述目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI；
    当采集到一组CSI时，所述CSI获取模块通过所述异步通知接口向所述服务请求程序发送这一组CSI，其中，这一组CSI用于表示采集到的同一PPDU所携带的CSI。
  2. 根据权利要求1所述的方法，其特征在于，当所述监听信道列表中未记载任何内容时，在所述CSI获取模块通过所述服务请求接口接收所述服务请求程序发送的请求消息之后，包括：
    所述CSI获取模块在所述STA设备当前所处信道上，从所述目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI。
  3. 根据权利要求1所述的方法，其特征在于，所述CSI获取模块从所述目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI，包括：
    所述CSI获取模块从接收到的PPDU中获取发送所述PPDU的AP设备的媒体访问控制MAC地址；
    当所述MAC地址为目标AP设备的MAC地址时，所述CSI获取模块从所述PPDU中提取CSI。
  4. 根据权利要求3所述的方法，其特征在于，当所述目标AP设备列表中未记载任何内容，或者所述目标AP设备列表中存在至少一个表示目标AP设备的MAC地址为特殊预设值时，所述特殊预设值不代表任何目标AP设备的MAC地址，在所述CSI获取模块通过所述服务请求接口接收所述服务请求程序发送的请求消息之后，包括：
    所述CSI获取模块在所述监听信道列表中记载的所有待监听信道上，按照所述信道停留监听时间，从所有接收到的PPDU中提取CSI。
  5. 根据权利要求1所述的方法，其特征在于，所述请求消息中还包括总监听时间，在所述CSI获取模块通过所述异步通知接口向所述服务请求程序发送这一组CSI之后，包括：
    当在每个待监听信道上进行监听的时间之和小于所述总监听时间时，所述CSI获取模块按照所述信道停留监听时间，继续在待监听信道上接收所有目标AP设备发送的PPDU并提取CSI。
  6. 根据权利要求1或5所述的方法，其特征在于，所述服务请求接口包括第一服 务请求接口和第二服务请求接口，所述CSI获取模块通过所述服务请求接口接收所述服务请求程序发送的请求消息，包括：
    所述CSI获取模块通过所述第一服务请求接口接收所述服务请求程序发送的请求消息；
    在所述CSI获取模块通过所述异步通知接口向所述服务请求程序发送这一组CSI之后，包括：
    所述CSI获取模块通过所述第二服务请求接口接收所述服务请求程序发送的终止CSI采集消息，并终止CSI采集过程。
  7. 根据权利要求1所述的方法，其特征在于，所述请求消息还包括最大CSI获取间隔，在采集到一组CSI之后，包括：
    当在所述最大CSI获取间隔之内未采集到与这一组CSI属于同一AP设备的下一组CSI时，所述CSI获取模块向所述同一AP设备所在信道内的每个AP设备广播请求报文，以便于所述同一AP设备所在信道内的每个AP设备向所述CSI获取模块发送应答报文；
    所述CSI获取模块从所述应答报文中提取CSI。
  8. 根据权利要求1、5、7中任意一项所述的方法，其特征在于，所述CSI获取模块通过所述异步通知接口向所述服务请求程序发送这一组CSI，包括：
    所述CSI获取模块生成这一组CSI对应的CSI通知消息，所述CSI通知消息包括MAC地址和这一组CSI的内容，所述MAC地址为发送携带有这一组CSI的PPDU的AP设备的MAC地址；
    所述CSI获取模块向所述服务请求程序发送所述CSI通知消息。
  9. 一种基于802.11网络的CSI获取装置，其特征在于，所述装置用于一种802.11网络中的站点STA设备，所述STA设备还设置有运行在所述STA设备上的服务请求程序，所述服务请求程序与所述CSI获取装置之间能够通过服务请求接口与异步通知接口进行数据传输，所述CSI获取装置包括：
    接收单元，用于通过所述服务请求接口接收所述服务请求程序发送的请求消息，所述请求消息中至少包括监听信道列表、信道停留监听时间和目标接入点AP设备列表，所述监听信道列表中记载了待监听频带，以及与每个待监听频带对应的待监听信道，所述信道停留监听时间为所述CSI获取装置在单个信道上监听目标AP设备发送的物理层协议数据单元PPDU并从中提取CSI的时间；
    处理单元，用于在所述监听信道列表中记载的所有待监听信道上，按照所述信道停留监听时间，从所述目标AP设备列表中记载的所有目标AP设备发送的物理层协议数据单元PPDU中提取CSI；
    发送单元，用于当采集到一组CSI时，通过所述异步通知接口向所述服务请求程序发送这一组CSI，其中，这一组CSI用于表示采集到的同一PPDU所携带的CSI。
  10. 根据权利要求9所述的CSI获取装置，其特征在于，当所述监听信道列表中未记载任何内容时，所述处理单元，具体用于：
    在所述STA设备当前所处信道上，从所述目标AP设备列表中记载的所有目标AP设备发送的PPDU中提取CSI。
  11. 根据权利要求9所述的CSI获取装置，其特征在于，所述处理单元，具体用于：
    从接收到的PPDU中获取发送所述PPDU的AP设备的媒体访问控制MAC地址；
    当所述MAC地址为目标AP设备的MAC地址时，从所述PPDU中提取CSI。
  12. 根据权利要求11所述的CSI获取装置，其特征在于，当所述目标AP设备列表中未记载任何内容，或者所述目标AP设备列表中存在至少一个表示目标AP设备的MAC地址为特殊预设值时，所述特殊预设值不代表任何目标AP设备的MAC地址，所述处理单元，还用于在所述监听信道列表中记载的所有待监听信道上，按照所述信道停留监听时间，从所有接收到的PPDU中提取CSI。
  13. 根据权利要求9所述的CSI获取装置，其特征在于，所述请求消息中还包括总监听时间，所述处理单元，还用于当在每个待监听信道上进行监听的时间之和小于所述总监听时间时，按照所述信道停留监听时间，继续在待监听信道上接收所有目标AP设备发送的PPDU并提取CSI。
  14. 根据权利要求9或13所述的CSI获取装置，其特征在于，所述服务请求接口包括第一服务请求接口和第二服务请求接口，所述接收单元，具体用于：
    通过所述第一服务请求接口接收所述服务请求程序发送的请求消息；
    所述接收单元，还用于通过所述第二服务请求接口接收所述服务请求程序发送的终止CSI采集消息，并终止CSI采集过程。
  15. 根据权利要求9所述的CSI获取装置，其特征在于，所述发送单元，还用于当在所述最大CSI获取间隔之内未采集到与这一组CSI属于同一AP设备的下一组CSI时，向所述同一AP设备所在信道内的每个AP设备广播请求报文，以便于所述同一AP设备所在信道内的每个AP设备向所述CSI获取装置发送应答报文；
    所述处理单元，还用于从所述应答报文中提取CSI。
  16. 根据权利要求9、13、15中任意一项所述的CSI获取装置，其特征在于，所述发送单元，具体用于：
    生成这一组CSI对应的CSI通知消息，所述CSI通知消息包括MAC地址和这一组CSI的内容，所述MAC地址为发送携带有这一组CSI的PPDU的AP设备的MAC地址；
    向所述服务请求程序发送所述CSI通知消息。
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