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WO2017041629A1 - Procédé de traitement par balayage actif et dispositif associé, et système de communication - Google Patents

Procédé de traitement par balayage actif et dispositif associé, et système de communication Download PDF

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Publication number
WO2017041629A1
WO2017041629A1 PCT/CN2016/096634 CN2016096634W WO2017041629A1 WO 2017041629 A1 WO2017041629 A1 WO 2017041629A1 CN 2016096634 W CN2016096634 W CN 2016096634W WO 2017041629 A1 WO2017041629 A1 WO 2017041629A1
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WIPO (PCT)
Prior art keywords
available channel
frame
access point
request frame
probe
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PCT/CN2016/096634
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English (en)
Chinese (zh)
Inventor
林英沛
苏宏家
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2017041629A1 publication Critical patent/WO2017041629A1/fr
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    • 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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of wireless network technologies, and in particular, to an active scan processing method and related apparatus and a communication system.
  • the STA To become a member of a Wi-Fi wireless network, the STA (STA) needs to scan the Wi-Fi wireless network. Under the existing Wi-Fi standard IEEE 802.11 framework, there are two modes of passive scanning and active scanning for the STA to select to scan the Wi-Fi wireless network.
  • the STA In the passive scanning mode, the STA needs to scan the beacon frame (Beacon frame) under each channel, and the Beacon frame contains the information of the wireless network for the STA to access.
  • the STA In the active scan mode, the STA actively sends a Probe Request frame. After the access point (AP, Access Point) receives the request from the STA, the AP can agree to the STA request if the condition is met.
  • a probe response (Probe Response) frame is returned to the STA.
  • the AP listens to the channel state, and when the duration of the channel remains idle exceeds the duration of the distributed inter-frame space (DIFS), the backoff is started until the channel idle time is greater than the total backoff duration, that is, the backoff timing. By 0, the AP competes for a successful channel.
  • the AP sends a Probe Response frame to the STA, and the STA that receives the Probe Response frame returns an acknowledgement frame (ACK frame) to the AP.
  • DIFS distributed inter-frame space
  • the inventor of the present invention found in the research and practice that the existing Wi-Fi technology uses the carrier sense multiple access (CSMA) mechanism, and the AP needs to compete for the entire channel in the active scan mode. To send a Probe Response frame.
  • CSMA carrier sense multiple access
  • the number of neighboring APs and STAs is large in a dense deployment scenario.
  • the number of APs participating in the competition may be large. This may increase the number of competitive collisions between APs, which may increase the competition overhead and waste of communication resources. Performance is reduced.
  • the embodiments of the present invention provide an active scanning processing method, a related device, and a communication system, so as to reduce the number of competitive collisions between APs, thereby reducing competition overhead and communication resource waste, thereby improving overall system performance.
  • a first aspect of the embodiments of the present invention provides an active scanning processing method, including:
  • the access point receives the probe request frame sent by the station at the first available channel
  • the access point sends a probe response frame corresponding to the probe request frame on one of the plurality of subchannels of the first available channel;
  • the access point receives an acknowledgement frame sent by the station for the probe response frame on the first available channel.
  • the access point sends a probe response corresponding to the probe request frame on one of the plurality of subchannels of the first available channel
  • the frame includes: the access point randomly selects one of the plurality of subchannels of the first available channel to send a probe response frame corresponding to the probe request frame.
  • the probe request frame carries a subchannel division indication
  • the method further includes: the access point is based on the child The channel division indication divides the first available channel into a plurality of subchannels.
  • the access point is one of the plurality of subchannels of the first available channel Before the subchannel sends the probe response frame corresponding to the probe request frame, the method further includes: the access point dividing the first available channel into multiple subchannels based on protocol configuration information.
  • the probe request frame is carried
  • the value of the basic service unit color field is set to a wildcard or a specified color value, and the basic service unit color field is used to indicate the basic service unit.
  • the basic service unit color field is carried by a high efficiency preamble of the probe request frame Let the -A field or the Efficient Signaling-B field.
  • a sixth possible implementation manner of the first aspect if the basic service of the probe request frame is The value of the unit color field is set to a specified color value, and the access point is an access point corresponding to the specified color value.
  • the access point is Receiving, by the first available channel, the acknowledgement frame sent by the station for the probe response frame includes: the access point receiving the station on the first available channel, and using orthogonal frequency division on the first available channel An acknowledgement frame for the probe response frame sent in multiple access mode or multicast mode or broadcast mode.
  • the method further includes:
  • the access point receives an acknowledgement frame sent by the station for the probe response frame on the second available channel.
  • a second aspect of the embodiments of the present invention provides an active scanning processing method, including:
  • the station sends a probe request frame on the first available channel
  • the station receives, on the first available channel, a probe response frame corresponding to the probe request frame sent by an access point on one of the plurality of subchannels of the first available channel;
  • the station transmits an acknowledgement frame for the probe response frame on the first available channel.
  • the receiving, by the first available channel, the access point is sent by using one of the plurality of subchannels of the first available channel
  • the probe response frame corresponding to the probe request frame includes: corresponding to the probe request frame sent by the first available channel receiving access point, which is randomly selected by one of the plurality of subchannels of the first available channel Probe response frame.
  • the probe request frame carries a subchannel division indication, where the subchannel division The indication is for indicating that the access point divides the first available channel into multiple subchannels.
  • the value of the basic service unit color field is set to a wildcard or a specified color value, and the basic service unit color field is used to indicate the basic service unit.
  • the basic service unit color field is carried by a high efficiency preamble of the probe request frame Let the -A field or the Efficient Signaling-B field.
  • a fifth possible implementation manner of the second aspect if the basic service unit color of the probe request frame is The value of the field is set to a specified color value, and the access point is an access point corresponding to the specified color value.
  • the An acknowledgment frame for the probe response frame is sent by the available channel, where the station sends the probe response frame in an orthogonal frequency division multiple access manner or a multicast manner or a broadcast manner on the first available channel. Confirmation frame.
  • the method further includes:
  • the station Sending, by the station, the probe request frame on a second available channel; the station receiving, at the second available channel, the probe sent by an access point on one of a plurality of subchannels of the second available channel A probe response frame corresponding to the request frame; the station transmitting an acknowledgement frame for the probe response frame on the second available channel.
  • a third aspect of the present invention provides an access point, including:
  • a receiving unit configured to receive, by the first available channel, a probe request frame sent by the station;
  • a sending unit configured to send, according to one of the plurality of subchannels of the first available channel, a probe response frame corresponding to the probe request frame;
  • the receiving unit is further configured to receive, at the first available channel, the station for the detection The acknowledgement frame that should be sent by the frame.
  • the sending unit is specifically configured to randomly select one of the plurality of subchannels of the first available channel to send the probe request frame. Corresponding probe response frame.
  • the probe request frame carries a subchannel division indication;
  • the access point further includes And a channel determining unit, configured to divide the first available channel into multiple subchannels according to the subchannel dividing instruction.
  • the access point further includes a channel determining unit, configured to use the protocol configuration information
  • the first available channel is divided into a plurality of subchannels.
  • the probe request frame carries The value of the basic service unit color field is set to a wildcard or a specified color value, and the basic service unit color field is used to indicate the basic service unit.
  • the basic service unit color field is carried by a high efficiency preamble of the probe request frame Let the -A field or the Efficient Signaling-B field.
  • a sixth possible implementation manner of the third aspect if the basic service unit color of the probe request frame is The value of the field is set to a specified color value, and the access point is an access point corresponding to the specified color value.
  • the first available channel And receiving, by the receiving station, an acknowledgment frame sent by the station for the probe response frame, where the receiving unit is configured to: when the first available channel receives the station, use orthogonal frequency division on the first available channel.
  • An acknowledgement frame for the probe response frame sent in the address mode or the multicast mode or the broadcast mode.
  • the receiving unit is further configured to receive, by using the second available channel, the probe request frame sent by the station;
  • the sending unit is configured to send, according to one of the plurality of subchannels of the second available channel, a probe response frame corresponding to the probe request frame;
  • the receiving unit is further configured to receive, on the second available channel, an acknowledgement frame sent by the station for the probe response frame.
  • a fourth aspect of the present invention provides a site, including:
  • a sending unit configured to send a probe request frame on the first available channel
  • a receiving unit configured to receive, on the first available channel, a probe response frame corresponding to the probe request frame sent by an access point on one of the plurality of subchannels of the first available channel;
  • the sending unit is further configured to send an acknowledgement frame for the probe response frame on the first available channel.
  • the receiving, by the first available channel, the access point is sent by using one of the plurality of subchannels of the first available channel
  • the probe response frame corresponding to the probe request frame includes: corresponding to the probe request frame sent by the first available channel receiving access point, which is randomly selected by one of the plurality of subchannels of the first available channel Probe response frame.
  • the probe request frame carries a subchannel division indication, where the subchannel division The indication is for indicating that the access point divides the first available channel into multiple subchannels.
  • the value of the basic service unit color field is set to a wildcard or a specified color value, and the basic service unit color field is used to indicate the basic service unit.
  • the basic service unit color field is carried by a high efficiency preamble of the probe request frame Let the -A field or the Efficient Signaling-B field.
  • the access point is the specified color The access point corresponding to the value.
  • An aspect of the acknowledgement frame for the probe response frame is sent by the available channel: the sending unit is specifically configured to send the probe response in the orthogonal frequency division multiple access mode or the multicast mode or the broadcast mode on the first available channel.
  • the confirmation frame of the frame is sent by the available channel: the sending unit is specifically configured to send the probe response in the orthogonal frequency division multiple access mode or the multicast mode or the broadcast mode on the first available channel.
  • the sending unit is further used Transmitting the probe request frame on a second available channel;
  • the receiving unit is further configured to: receive, on the second available channel, a probe response frame corresponding to the probe request frame sent by an access point on one of the plurality of subchannels of the second available channel;
  • the sending unit is further configured to send an acknowledgement frame for the probe response frame on the second available channel.
  • a fifth aspect of the present invention provides an access point, including:
  • the processor is configured to perform the following steps by calling an instruction or code stored in the memory:
  • the processor is specifically configured to randomly select one of the plurality of subchannels of the first available channel to send the probe request frame Corresponding probe response frame.
  • the probe request frame carries a subchannel division indication
  • the processor is further configured to divide the first available channel into multiple subchannels according to the subchannel division indication.
  • the access point further includes a channel determining unit, configured to use the protocol configuration information
  • the first available channel is divided into a plurality of subchannels.
  • the probe request frame carries The value of the basic service unit color field is set to a wildcard or a specified color value, and the basic service unit color field is used to indicate the basic service unit.
  • the basic service unit color field is carried by a high efficiency preamble of the probe request frame Let the -A field or the Efficient Signaling-B field.
  • a sixth possible implementation manner of the fifth aspect if the basic service unit color of the probe request frame is The value of the field is set to a specified color value, and the access point is an access point corresponding to the specified color value.
  • the processor is specifically used Receiving, by the antenna, the acknowledgement for the probe response frame sent by the station on the first available channel in an orthogonal frequency division multiple access manner or a multicast manner or a broadcast manner on the first available channel. frame.
  • the processor is further used Receiving, by the antenna, the probe request frame sent by the station on a second available channel; transmitting, by using the antenna, the probe request frame corresponding to one of the plurality of subchannels of the second available channel Detecting a response frame; receiving, by the antenna, an acknowledgement frame sent by the station for the probe response frame on the second available channel.
  • a sixth aspect of the present invention provides a site, including:
  • the processor is configured to perform: transmitting, by the antenna, a probe request frame on a first available channel; receiving, by the antenna, on the first available channel And a sounding response frame corresponding to the sounding request frame sent by one of the plurality of subchannels of the first available channel; and transmitting, by the antenna, the probe response frame on the first available channel Confirm the frame.
  • the processor is configured to receive, by using the antenna, a plurality of subchannels of an access point in the first available channel on the first available channel. a probe response frame corresponding to the probe request frame sent by one of the subchannels that is randomly selected.
  • the probe request frame carries a subchannel division indication, where the subchannel division The indication is for indicating that the access point divides the first available channel into multiple subchannels.
  • the value of the basic service unit color field is set to a wildcard or a specified color value, and the basic service unit color field is used to indicate the basic service unit.
  • the basic service unit color field is carried by a high efficiency preamble of the probe request frame Let the -A field or the Efficient Signaling-B field.
  • the basic service unit color of the probe request frame is The value of the field is set to a specified color value
  • the access point is an access point corresponding to the specified color value
  • an acknowledgment frame for the probe response frame transmitted by the antenna on the first available channel in an orthogonal frequency division multiple access manner or a multicast manner or a broadcast manner.
  • the processor is further configured to send, by using the antenna, the probe request frame on a second available channel; Receiving, by the second available channel, a sounding response frame corresponding to the sounding request frame sent by the access point on one of the plurality of subchannels of the second available channel; transmitting, by the antenna, the second available channel An acknowledgement frame of the probe response frame.
  • a seventh aspect of the present invention provides a communication system, including:
  • Any one of the access points provided by the embodiment of the present invention further includes any one of the sites provided by the embodiment of the present invention.
  • An eighth aspect of the invention provides a computer readable medium, a computer readable medium
  • the computer readable storage medium stores program code for active scanning processing.
  • the program code includes instructions for performing the method of the first aspect or the second aspect.
  • the available channel (such as the first available channel) can be logically divided into multiple subchannels, and after the first available channel receives the Probe Request frame sent by the STA, the AP is in the first available channel.
  • One of the plurality of subchannels transmits a Probe Response frame corresponding to the Probe Request frame, so even if multiple APs in a certain scenario send a Probe Response frame on the same available channel, if multiple APs are in the same time period, Sending a Probe Response frame on different subchannels of the available channel helps to avoid competing collisions of the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can reply to the corresponding Probe Response frame in one subchannel of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric asymmetric Probe Response frame reply.
  • this mechanism is relative to the traditional symmetric Probe Response frame reply mechanism (in which, in the traditional symmetric Probe Response frame reply mechanism, the AP receives the Probe Request frame on the entire available channel and replies to the corresponding Probe Response frame on the entire available channel.
  • the transmit and receive frames are symmetrical. This helps reduce the number of competitive collisions between APs, which in turn helps reduce the competition overhead and waste of communication resources, and thus improves the overall performance of the wireless system.
  • FIG. 1 is a schematic diagram of a wireless network deployment architecture according to an embodiment of the present invention
  • FIG. 1B is a schematic diagram of another wireless network deployment architecture according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of another wireless network deployment architecture according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of an active scan processing method according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of another active scan processing method according to an embodiment of the present invention.
  • FIG. 4A is a schematic flowchart of another active scan processing method according to an embodiment of the present invention.
  • 4B is a schematic structural diagram of a Probe Request frame and a physical layer frame header according to an embodiment of the present invention
  • 4C is a schematic diagram of a frame interaction according to an embodiment of the present invention.
  • FIG. 5-A is a schematic flowchart of another active scan processing method according to an embodiment of the present invention.
  • FIG. 5-B is a schematic diagram of another frame interaction provided by an embodiment of the present invention.
  • FIG. 5-C is a schematic diagram of another frame interaction provided by an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of another active scan processing method according to an embodiment of the present invention.
  • FIG. 6-B is a schematic diagram of another frame interaction provided by an embodiment of the present invention.
  • FIG. 6-C is a schematic diagram of another frame interaction provided by an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an access point according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of another access point according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a station according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of another station according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a communication system according to an embodiment of the present invention.
  • the embodiments of the present invention provide an active scanning processing method, a related device, and a communication system, so as to reduce the number of competitive collisions between APs, thereby reducing competition overhead and communication resource waste, thereby improving overall system performance.
  • FIG. 1A to FIG. 1C are schematic diagrams of three wireless network deployment architectures provided by an embodiment of the present invention.
  • FIG. 1-A shows that there are multiple STAs in the signal coverage of multiple APs, and there are multiple STAs in the signal coverage of a single AP in FIG. 1-B, and multiple APs are illustrated in FIG. 1-C. There is a single STA in the signal coverage.
  • the technical solution of the embodiment of the present invention may be specifically implemented based on the wireless network deployment architecture or its variant architecture illustrated in FIG. 1-A or FIG. 1-B or FIG.
  • FIG. 2 is a schematic flowchart diagram of an active scan processing method according to an embodiment of the present invention.
  • an active scanning processing method provided by an embodiment of the present invention may include:
  • the AP receives a Probe Request frame sent by the STA on the first available channel.
  • the product form of the STA mentioned in the embodiments of the present invention may be, for example, a product form of a tablet computer, a notebook computer, a mobile internet device, a palmtop computer, a desktop computer, a mobile phone, or other user terminals.
  • the STA may send a Probe Request frame on the first available channel, for example, the STA may be in the first A Probe Request frame is sent over the entire bandwidth of the available channel.
  • the AP may receive a Probe Request frame sent by the STA on the first available channel on the first available channel, for example, the AP may receive the Probe Request frame on the entire bandwidth of the first available channel.
  • the number of available channels for communication interaction provided to the AP and the STA may be N, and the first available channel is one of N available channels.
  • the available channels for communication interactions provided to the APs and STAs may include only the first available channel, or the available channels for communication interactions provided to the APs and STAs may include the first available channel and the second channel, and the like.
  • the number of available channels for communication interactions provided to the AP and STA can be more.
  • the bandwidths of the N available channels may be equal or partially equal or unequal to each other.
  • the bandwidth of the first available channel may be equal to 20M or the like.
  • the N may be an integer greater than or equal to 1.
  • the N can be, for example, equal to 1, 2, 3, 4, 5, 6, 7, 8, 9, or other values.
  • the AP sends a Probe Response frame corresponding to the Probe Request frame on one of the plurality of subchannels of the first available channel.
  • the AP sends the Probe Response frame corresponding to the Probe Request frame on one of the plurality of subchannels of the first available channel, and the AP can be regarded as an OFDM in the orthogonal frequency division multiple access manner on the first available channel.
  • the Probe Response frame corresponding to the Probe Request frame is sent, that is, the AP does not send the Probe Response frame corresponding to the Probe Request frame in the entire bandwidth of the first available channel, but sends the Probe Response frame corresponding to the Probe Request frame in a part of the bandwidth of the first available channel.
  • the available channel (such as the first available channel) can be logically divided into multiple subchannels (which can be represented as K subchannels).
  • the K may be an integer greater than or equal to two.
  • the bandwidths of the K subchannels may be equal or partially equal or unequal to each other, that is, the spacing between the K subchannels may be equal or partially equal or unequal to each other.
  • one subchannel may be equivalent to one or more resource units.
  • the K can be equal to 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 29, 36 or other values.
  • the AP may determine how to divide an available channel (eg, the first available channel) into multiple (K) subchannels based on various ways.
  • the method may further include: the AP dividing the first available channel according to protocol configuration information. Is a plurality (K) of subchannels, wherein the K is a positive integer greater than or equal to 2. That is, the related protocol may stipulate how to divide the available channels (such as the first available channel) into K subchannels, and the AP may divide the first available channel into multiples (K according to the provisions of the relevant protocol). ) Subchannel.
  • the Probe Request frame carries a subchannel division indication
  • the method may further include: The AP divides the first available channel into a plurality of (K) subchannels based on the subchannel division indication.
  • the subchannel division indication may, for example, indicate the value of K, that is, the subchannel division indication may indicate the number of subchannels that the AP can use, and may even indicate the bandwidth or resource location of each of the K subchannels, and the like.
  • the subchannel division indication may be carried in an AP configuration information field carried in a Probe Request frame, where the AP Configuration information field may be carried in, for example, the HE-SIG-B ( The Efficient Signaling-B) field is either carried elsewhere in the Probe Request frame.
  • AP Configuration information field may be carried in, for example, the HE-SIG-B ( The Efficient Signaling-B) field is either carried elsewhere in the Probe Request frame.
  • the AP receives, on the first available channel, an acknowledgement frame sent by the STA for the Probe Response frame.
  • the STA may send an acknowledgement frame sent for the Probe Response frame on the first available channel, for example, the STA may send an acknowledgement frame sent for the Probe Response frame on the entire bandwidth of the first available channel.
  • the AP may receive, on the first available channel, an acknowledgement frame sent by the STA on the first available channel for the Probe Response frame, for example, the AP may receive the probe response frame on the entire bandwidth of the first available channel.
  • the AP since the available channel (such as the first available channel) can be logically divided into multiple subchannels, the AP is available in the first available after receiving the Probe Request frame sent by the STA on the first available channel.
  • One of the plurality of subchannels of the channel transmits a Probe Response frame corresponding to the Probe Request frame. Therefore, if multiple APs in a certain scenario send a Probe Response frame on the same available channel, if multiple APs are in the same time period, Not on the same available channel Sending a Probe Response frame with the same subchannel helps to avoid the competitive collision of the multiple APs.
  • an AP can reply to a corresponding Probe Response frame in one subchannel of an available channel of a Probe Request frame.
  • This innovative mechanism can be regarded as an asymmetric type (transceiver bandwidth is not Symmetrically) Probe Response frame reply mechanism, which is relative to the traditional symmetric Probe Response frame reply mechanism (in which, in the traditional symmetric Probe Response frame reply mechanism, the AP receives the Probe Request frame over the available channels and is available throughout The channel responds to the corresponding Probe Response frame, and the sending and receiving frames are symmetric in bandwidth. In this case, it helps to reduce the number of competitive collisions between APs, which is beneficial to reduce the competition overhead and waste of communication resources, and thus improve the overall performance of the wireless system.
  • the sending, by the AP, the Probe Response frame corresponding to the Probe Request frame in one of the multiple subchannels of the first available channel may include: One of the plurality of subchannels of the first available channel randomly selects one of the subchannels to transmit a Probe Response frame corresponding to the Probe Request frame, or the AP may send the designated subchannel of the plurality of subchannels of the first available channel.
  • a Probe Response frame corresponding to the Probe Request frame, where the designated subchannel that sends the Probe Response frame corresponding to the Probe Request frame may be specified by the STA.
  • a value of a basic service unit (BSS) color field (BSS_color field) of the Probe Request frame may be set to a wildcard (such as a wildcard) or Specify the color value.
  • the BSS_color field is used to indicate a basic service unit. For example, different color values may be used to specify different basic service units. For example, the BSS_color field takes a value of 1 and the BSS_color field takes a value of 2 to indicate that a different BSS is specified.
  • the AP can be used to define the AP.
  • the value of the BSS_color field when the value of the BSS_color field is set to the specified color value, it may indicate that the AP that belongs to the BSS specified by the specified color value is required to reply to the corresponding Probe Response frame, for example, when the Probe Request frame is used.
  • the value of the BSS_color field is set to a specified color value, and the AP is an AP corresponding to the specified color value, that is, the AP belongs to the BSS specified by the specified color value.
  • the value of the BSS_color field when the value of the BSS_color field is set to a wildcard, it may indicate a reply to the Probe Response.
  • the BSS to which the AP of the frame belongs is not required, that is, the APs belonging to any BSS have the right to reply to the Probe Response frame corresponding to the Probe Request frame.
  • the BSS_color field may be carried in a High Efficiency Preamble High Efficiency Signaling-A (HE-SIG-A) field of a Probe Request frame.
  • HE-SIG-A High Efficiency Preamble High Efficiency Signaling-A
  • HE-SIG-B Efficient Signaling-B
  • the BSS_color field may be carried in a common part field of the HE-SIG-B field.
  • the BSS_color field may also be carried in other fields of the HE Preamble of the Probe Request frame.
  • the receiving, by the AP, the acknowledgement frame sent by the STA for the Probe Response frame on the first available channel includes: the AP receiving the first available channel An acknowledgment frame (ACK frame) for the Probe Response frame transmitted by the STA on the first available channel in a multicast mode or a broadcast mode or an Orthogonal Frequency Division Multiple Access (OFDMA) manner.
  • the acknowledgement frame may be in the form of, for example, a block acknowledgement (BA, Block ACK) / a multi-user block acknowledgment (M-BA).
  • the STA may further declare the capability information of the STA itself in a HE Capability field or other field carried in the MAC payload of the Probe Request frame, where the STA itself
  • the capability information may indicate that the STA is capable of receiving an OFDMA-type data packet.
  • the AP can learn the capability of the STA that sends the Probe Request frame, and then can respond to the corresponding Probe Response frame in the OFDMA mode. Accordingly, the STA can receive the corresponding Probe Response frame replied by the AP in the OFDMA mode on the first available channel. And an acknowledgement frame (ACK frame) for the Probe Response frame transmitted in the OFDMA mode (or multicast mode or broadcast mode) on the first available channel.
  • ACK frame acknowledgement frame for the Probe Response frame transmitted in the OFDMA mode (or multicast mode or broadcast mode) on the first available channel.
  • the method may further include:
  • the AP Receiving, by the AP, the Probe Request frame sent by the STA on a second available channel, where the AP sends a Probe Response frame corresponding to the Probe Request frame on one of the plurality of subchannels of the second available channel.
  • the AP receives an acknowledgement frame sent by the STA for the Probe Response frame on the second available channel.
  • the STA may send the Probe Request frame on the second available channel, and correspondingly, the AP may The Probe Request frame sent by the STA on the second available channel is received on the second available channel.
  • the STA may send the Probe Request frame on the first available channel and the second available channel at the same time or at the same time, and the AP may receive the Probe Request frame sent by the STA on the second available channel and the first available channel, respectively. .
  • the STA can send the Probe Request frame on multiple available channels, and the AP can respectively reply to the corresponding Probe Response frame for multiple available channels, which is beneficial to improving the success rate of the STA active scanning.
  • FIG. 3 is a schematic flowchart diagram of another active scan processing method according to another embodiment of the present invention.
  • another active scanning processing method provided by another embodiment of the present invention may include:
  • the STA sends a Probe Request frame on the first available channel.
  • the product form of the STA mentioned in the embodiments of the present invention may be, for example, a product form of a tablet computer, a notebook computer, a mobile internet device, a palmtop computer, a desktop computer, a mobile phone, or other user terminals.
  • the STA may send a Probe Request frame over the entire bandwidth of the first available channel.
  • the AP may receive a Probe Request frame sent by the STA on the first available channel on the first available channel, for example, the AP may receive the Probe Request frame on the entire bandwidth of the first available channel.
  • the STA may receive, in the first available channel, a Probe Response frame corresponding to the Probe Request frame sent by an AP on one of the plurality of subchannels of the first available channel.
  • the AP sends the Probe Response frame corresponding to the Probe Request frame on one of the plurality of subchannels of the first available channel, and the AP can be regarded as an OFDM in the orthogonal frequency division multiple access manner on the first available channel.
  • the Probe Response frame corresponding to the Probe Request frame is sent, that is, the AP does not send the Probe Response frame corresponding to the Probe Request frame in the entire bandwidth of the first available channel, but sends the Probe Response frame corresponding to the Probe Request frame in a part of the bandwidth of the first available channel. Therefore, the STA is specifically a Probe Response frame corresponding to the Probe Request frame sent by the AP on the first available channel in an orthogonal frequency division multiple access manner on the first available channel.
  • the STA may receive, in the first available channel, a Probe Response frame corresponding to the Probe Request frame sent by the AP on a randomly selected one of the plurality of subchannels of the first available channel.
  • the STA may receive, in the first available channel, a Probe Response frame corresponding to the Probe Request frame sent by the AP on one of the plurality of subchannels of the first available channel.
  • the STA sends an acknowledgement frame for the Probe Response frame on the first available channel.
  • the STA may send an acknowledgment frame sent for the Probe Response frame on the entire bandwidth of the first available channel, or the STA may send an acknowledgment frame sent for the Probe Response frame in the OFDMA of the first available channel.
  • the AP may receive, on the first available channel, an acknowledgement frame sent by the STA on the first available channel for the Probe Response frame, for example, the AP may receive the probe response frame on the entire bandwidth of the first available channel. The confirmation frame sent.
  • the AP since the available channel (such as the first available channel) can be logically divided into multiple subchannels, the AP is in the first after receiving the Probe Request frame sent by the STA on the first available channel.
  • the Probe Response frame corresponding to the Probe Request frame is sent by one of the plurality of subchannels of the available channel. Therefore, if multiple APs in a certain scenario send a Probe Response frame on the same available channel, if multiple APs are in the same time period, It is to send a Probe Response frame on different subchannels of the same available channel, which is beneficial to avoid the competitive collision of the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can reply to the corresponding Probe Response frame in one subchannel of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric asymmetric Probe Response frame reply.
  • this mechanism is relative to the traditional symmetric Probe Response frame reply mechanism (wherein, in the traditional symmetric Probe Response frame reply mechanism, the AP responds to the corresponding Probe Response frame by receiving the entire available channel of the Probe Request frame) It is beneficial to reduce the number of competitive collisions between APs, which is beneficial to reduce the competition overhead and waste of communication resources, and thus improve the overall performance of the wireless system.
  • the Probe Request frame may carry a subchannel division indication, where the subchannel division indication is used to indicate that the AP divides the first available channel into Multiple (K) subchannels.
  • the value of the basic service unit color field of the Probe Request frame is set to a wildcard or a specified color value.
  • the basic service unit color field is carried in an Efficient Signaling-A field or an Efficient Signaling-B field of the high-efficiency preamble carried in the Probe Request frame. .
  • the AP is an AP corresponding to the specified color value.
  • the STA sends an acknowledgement frame for the Probe Response frame on the first available channel, where the STA includes the OFDMA on the first available channel.
  • An acknowledgement frame for the Probe Response frame sent in multicast mode or broadcast mode.
  • the method further includes:
  • the STA Sending, by the STA, the Probe Request frame on a second available channel; the STA receiving, on the second available channel, the Probe Request frame sent by an AP on one of the plurality of subchannels of the second available channel Corresponding Probe Response frame; the STA sends an acknowledgement frame for the Probe Response frame on the second available channel.
  • the AP may receive the Probe Request frame sent by the STA on the second available channel on the second available channel.
  • the STA may send the Probe Request frame on the first available channel and the second available channel at the same time or at the same time, and the AP may receive the Probe Request frame sent by the STA on the second available channel and the first available channel, respectively.
  • the STA can send the Probe Request frame on multiple available channels, and the AP can respectively reply to the corresponding Probe Response frame for multiple available channels, which is beneficial to improving the success rate of the STA active scanning.
  • FIG. 4-A is a schematic flowchart diagram of another active scan processing method according to another embodiment of the present invention.
  • the active scanning processing method illustrated in FIG. 4-A can be in FIG. 1-A or FIG. 1-B. Or the specific implementation in the wireless network deployment architecture shown in the example of FIG. 1-C.
  • another active scanning processing method provided by another embodiment of the present invention may include:
  • S401 STA#1 sends Probe Request frame #1 on available channel #1.
  • Probe Request frame #1 and the physical layer frame header may be exemplified in FIG. 4-B.
  • the physical layer frame header carried by the Probe Request frame #1 includes a legacy preamble and a high efficiency preamble.
  • the high-efficiency preamble carried in the Probe Request frame #1 may carry the HE-SIG-A field, and may or may not carry the HE-SIG-B field.
  • the value of the BSS_color field carried in the Probe Request frame #1 is set to a specified color value.
  • the BSS_color field may be carried in a HE-SIG-A field or a HE-SIG-B field of a High Efficiency Preamble carried in a Probe Request frame, for example.
  • the BSS_color field may be carried in the public part field of the HE-SIG-B field.
  • the BSS_color field may also be carried in other locations of the HE Preamble carried in the Probe Request frame.
  • the available channel #1 may have a bandwidth of 20M or other bandwidth.
  • S402 and AP#1 receive the Probe Request frame #1 sent by STA#1 on the available channel #1, and AP#1 determines whether the AP#1 belongs to the BSS specified by the color value carried in the BSS_color field carried by the Probe Request frame #1.
  • step S403 is performed.
  • AP#1 can ignore the received Probe Request frame #1, that is, AP#1 does not reply to the Probe Response frame corresponding to Probe Request frame #1.
  • the Legacy Preamble and the High Efficiency Preamble are transmitted on the channel #1, and one of the plurality of subchannels (for example, 9 subchannels) of the available channel #1 is randomly selected to transmit the Probe Response frame #p1 corresponding to the Probe Request frame #1.
  • the AP #1 randomly selects one subchannel among the plurality of subchannels of the available channel #1 to transmit the Probe Response frame #p1 corresponding to the Probe Request frame #1, and can be regarded as the AP#1 in the available channel #1 in the OFDMA mode. Send the Probe Response frame #p1 corresponding to the Probe Request frame #1.
  • FIG. 4-C The case where multiple APs send a Probe Response frame in the OFDMA manner on the available channel #1 may be exemplified in FIG. 4-C.
  • the example shown in FIG. 4-C is mainly an example in which a plurality of APs transmit a Probe Response frame on different subchannels of the available channel #1.
  • STA#1 receives the Probe Response frame #p1 sent by AP#1 on one subchannel randomly selected among the plurality of subchannels of the available channel #1 in the available channel #1, wherein the STA#1 correctly receives the Probe Response frame. #p1, then STA#1 sends an acknowledgement frame #a1 for the Probe Response frame #p1 on the available channel #1.
  • AP#1 can receive the acknowledgement frame #a1 sent by STA#1 on the available channel #1.
  • the Probe Response frame #p1 can normally be correctly received by STA#1, and in AP#1.
  • the Probe Response frame #p1 is sent and the other AP#1 generates a random collision (a competitive collision occurs, that is, other APs use the same subchannel in the same time period or at the same time, and the Probe Response frame corresponding to the Probe Request frame #1 is also transmitted. ), Probe Response frame #p1 is usually not received correctly by STA#1.
  • the AP#1 since the available channel #1 can be logically divided into multiple subchannels, the AP#1 receives the Probe Request frame after the available channel #1 is sent to the available channel#1. Randomly selecting one subchannel among a plurality of subchannels of 1 to transmit a Probe Request frame corresponding The Probe Response frame, that is, AP#1 can transmit the Probe Response frame corresponding to the Probe Request frame in the OFDMA mode on the available channel #1, so even if there are multiple APs including AP#1 in a certain scenario, they are sent on the same available channel.
  • Probe Response frame if multiple APs send Probe Response frames on different subchannels of the same available channel in the same time period, it is beneficial to avoid the competition collision between the multiple APs. It can be seen that the foregoing solution in the embodiment introduces an innovative mechanism that the AP can randomly select one subchannel to reply to the corresponding Probe Response frame in multiple subchannels of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric type. Probe Response frame reply mechanism. Compared with the traditional symmetric Probe Response frame reply mechanism, this mechanism helps to reduce the number of competitive collisions between APs, which is beneficial to reduce the competition overhead and waste of communication resources, and thus improve the overall performance of the wireless system. .
  • FIG. 5-A is a schematic flowchart diagram of another active scan processing method according to another embodiment of the present invention.
  • the active scan processing method illustrated in FIG. 5-A can be embodied in the wireless network deployment architecture illustrated in FIG. 1-A or 1-C.
  • another active scanning processing method provided by another embodiment of the present invention may include:
  • STA#1 sends Probe Request frame #1 on available channel #1.
  • Probe Request frame #1 The structure of a possible Probe Request frame #1 and the physical layer frame header may be exemplified in FIG. 4-C.
  • the available channel #1 may have a bandwidth of 20M or other bandwidth.
  • AP#1 receives the Probe Request frame #1 sent by STA#1 on the available channel #1, and AP#1 randomly selects one subchannel among the plurality of subchannels of the available channel #1 to transmit the corresponding Probe Request frame #1. Probe Response frame #p1.
  • AP#1 may be after time interval xIFS (xIFS ⁇ DIFS(where, xIFS)
  • xIFS xIFS ⁇ DIFS(where, xIFS)
  • One of the subchannels is randomly selected to send a Probe Response frame #p1 corresponding to the Probe Request frame #1. That is to say, AP#1 can transmit the Probe Response frame #p1 corresponding to the Probe Request frame #1 in the OFDMA manner on the available channel #1.
  • STA#1 receives the Probe Response frame #p1 transmitted by AP#1 on one of the plurality of subchannels of the available channel #1, and the STA#1 transmits the available channel #1 on the available channel #1. Confirmation frame #a1 of Probe Response frame #p1. Correspondingly, AP#1 can receive the acknowledgement frame #a1 sent by STA#1 on the available channel #1.
  • S504 and AP#2 receive the Probe Request frame #1 sent by STA#1 on the available channel #1, and AP#2 randomly selects one subchannel among the plurality of subchannels of the available channel #1 to transmit the corresponding Probe Request frame #1.
  • STA#1 receives the Probe Response frame #p2 transmitted by AP#2 on one of the plurality of subchannels of the available channel #1, and the STA#1 transmits the available channel #1 on the available channel #1.
  • AP#2 can receive the acknowledgement frame #a2 sent by STA#1 on the available channel #1.
  • step S502 to step S503 and step S504 to step S505 can be performed in the same time period.
  • AP#1 and AP#2 there may be other one or more APs that can receive Probe Request frame #1 on available channel #1, and these APs respond to Probe Request frame #1.
  • the method is similar to AP#1 and AP#2.
  • APs such as AP#1, AP#2, AP#3, AP#4, AP#5, and AP#6 can reply to the corresponding Probe Response frame in a similar manner.
  • AP#1, AP#2, AP#3, and AP#6 respectively select different subchannels of available channel #1 to transmit corresponding Probe Response frames, and AP#4 and AP#5 are available due to selection.
  • the same subchannel of channel #1 transmits the corresponding Probe Response frame, thus generating a random collision, which causes STA#1 to not correctly receive the corresponding Probe Response frame sent by AP#4 and AP#5.
  • the number of APs that can receive (hear) the Probe Request frame of the STA may be much larger than the number of available subchannels of the available channel.
  • the AP randomly selects the subchannel to reply to the corresponding Probe Response frame, it is inevitable.
  • the STA when the STA is ready to receive the Probe Response frame on the available channel, the STA can usually detect the signal energy of the corresponding subchannel but cannot correctly interpret it (ie, the corresponding Probe Response frame cannot be correctly received), if most of the subchannels are If there is such a result, the STA can consider that the current scenario is a denser deployment scenario, and the number of APs is relatively large. Therefore, the AP may randomly select a subchannel to transmit a corresponding collision response frame, and the number of APs may be relatively large. It may not be sufficient to complete the full identification of the currently available wireless network.
  • the STA may trigger the Probe Request frame to continuously perform active scanning after replying the ACK frame to the AP, for example, as shown in the example of FIG. 5-C.
  • the AP that has responded to the corresponding Probe Response frame in the previous scan and successfully receives the corresponding ACK frame of the STA reply may no longer participate in the current scan, and only the AP that has not obtained the corresponding ACK frame participates in the random selection of the subchannel and sends in the current scan.
  • the flow of the Probe Response frame may be used to trigger the Probe Request frame to continuously perform active scanning after replying the ACK frame to the AP, for example, as shown in the example of FIG. 5-C.
  • the STA can maintain the previous round of related parameter configuration, or reconfigure the new parameters and indicate in the Probe Request frame. For example, the STA can increase the number of subchannels of the available channel. Large to further reduce the probability of random collisions. Of course, if a number of competing collisions exceeding a set threshold occurs during the second active scan, the SAT may initiate an active scan again.
  • the available channel #1 can be logically divided into multiple subchannels, multiple APs including AP#1 and AP#2 are receiving STA#1 in the available channel#
  • one of the plurality of subchannels of the available channel #1 can be randomly selected to send the Probe Response frame corresponding to the Probe Request frame, that is, each AP can send the Probe in the OFDMA mode on the available channel #1.
  • the Probe Response frame corresponding to the Request frame Therefore, if multiple APs send Probe Response frames on different subchannels of the same available channel in the same time period, it is beneficial to avoid the competition collision between the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can randomly select one subchannel to reply to the corresponding Probe Response frame in multiple subchannels of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric type.
  • Probe Response frame reply mechanism Compared with the traditional symmetric Probe Response frame reply mechanism, this mechanism helps to reduce the number of competitive collisions between APs, which is beneficial to reduce the competition overhead and waste of communication resources, and thus improve the overall performance of the wireless system. .
  • FIG. 6-A is a schematic flowchart diagram of another active scan processing method according to another embodiment of the present invention.
  • the active scan processing method illustrated in FIG. 6-A can be embodied in the wireless network deployment architecture illustrated in FIG. 1-A or FIG. 1-C.
  • another active scanning processing method provided by another embodiment of the present invention may include:
  • S601, STA#1 respectively send Probe Request frame #1 on available channel #1, available channel #2, available channel #3, and available channel #4.
  • the value of the BSS_color field carried in the Probe Request frame #1 is set to a wildcard, that is, the BSS to which the AP that replies to the Probe Response frame belongs is not required, that is, belongs to any The APs of the BSS have the right to reply to the Probe Response frame corresponding to the Probe Request frame #1.
  • the available channel #1 may have a bandwidth of 20M or other bandwidth
  • the available channel #2, available channel #3, and available channel #4 may have the same or different bandwidth than the available channel #1.
  • the bandwidths of available channel #1, available channel #2, available channel #3, and available channel #4 may be partially the same or identical or different from each other.
  • S602 and AP#1 respectively receive the Probe Request frame #1 sent by the STA#1 in the available channel #1 and the available channel #2, and the AP#1 finds the color value wildcard carried in the BSS_color field carried by the Probe Request frame #1, so It is determined that AP#1 has the right to reply to the corresponding Probe Response frame.
  • AP#1 randomly selects one subchannel among the plurality of subchannels of available channel #1 to transmit Probe Response frame #p1 corresponding to the Probe Request frame #1, and AP#1 may also be in multiple subchannels of available channel #2. One of the subchannels is randomly selected to transmit the Probe Response frame #p1 corresponding to the Probe Request frame #1.
  • STA#1 receives the Probe Response frame #p1 transmitted by the AP#1 randomly selected one of the plurality of subchannels of the available channel #1 in the available channel #1, wherein the STA#1 is the correct slave available channel# 1 Upon receiving the Probe Response frame #p1, STA#1 transmits an acknowledgement frame #a1 for the Probe Response frame #p1 on the available channel #1.
  • STA#1 can receive the Probe Response frame #p1 transmitted by the AP#1 randomly selected one of the plurality of subchannels of the available channel #2 on the available channel #2, wherein the STA#1 if the correct slave channel is available #2 receives the Probe Response frame #p1, then STA#1 transmits the acknowledgement frame #a1 for the Probe Response frame #p1 on the available channel #2.
  • S604 and AP#2 respectively receive the Probe Request frame #1 sent by the STA#1 in the available channel #1 and the available channel #3, and the AP#2 finds the color value wildcard carried in the BSS_color field carried by the Probe Request frame #1, so It is determined that AP#2 has the right to reply to the corresponding Probe Response frame.
  • AP#2 randomly selects one subchannel among the plurality of subchannels of available channel #1 to transmit Probe Response frame #p2 corresponding to the Probe Request frame #1, and AP#2 may also be in multiple subchannels of available channel #3. One of the subchannels is randomly selected to transmit the Probe Response frame #p2 corresponding to the Probe Request frame #1.
  • STA#1 receives the Probe Response frame #p2 transmitted by the AP#2 randomly selected one of the plurality of subchannels of the available channel #1 in the available channel #1, wherein the STA#1 is correct. Upon receiving the Probe Response frame #p2 from the available channel #1, STA#1 transmits the acknowledgement frame #a2 for the Probe Response frame #p2 on the available channel #1.
  • STA#1 can receive the Probe Response frame #p2 transmitted by AP#2 on one subchannel randomly selected among the plurality of subchannels of the available channel #3 on the available channel #3, wherein STA#1 if the correct slave channel is available #3 receives the Probe Response frame #p2, then STA#1 transmits the acknowledgement frame #a2 for the Probe Response frame #p2 on the available channel #3.
  • S606 and AP#3 respectively receive the Probe Request frame #1 sent by STA#1 in the available channel #2 and the available channel #4, and the AP#3 finds the color value wildcard carried in the BSS_color field carried by the Probe Request frame #1, so It is determined that AP#3 has the right to reply to the corresponding Probe Response frame.
  • AP#3 randomly selects one subchannel among the plurality of subchannels of available channel #2 to transmit Probe Response frame #p3 corresponding to the Probe Request frame #1, and AP#3 may also be in multiple subchannels of available channel #4. One of the subchannels is randomly selected to transmit the Probe Response frame #p3 corresponding to the Probe Request frame #1.
  • STA#1 receives, in available channel #2, Probe Response frame #p3 transmitted by AP#3 randomly selected one of the plurality of subchannels of available channel #2, where STA#1 is the correct slave available channel# 2 Upon receiving the Probe Response frame #p3, STA#1 transmits the acknowledgement frame #a3 for the Probe Response frame #p3 on the available channel #2.
  • STA#1 can receive the Probe Response frame #p3 transmitted by AP#3 on one of the plurality of subchannels of the available channel #4, which is transmitted from the available channel, in the available channel #4, if the correct one is from the available channel. #4 receives the Probe Response frame #p3, then STA#1 transmits the acknowledgement frame #a3 for the Probe Response frame #p3 on the available channel #4.
  • S608 and AP#4 respectively receive the Probe Request frame #1 sent by STA#1 on the available channel #3 and the available channel #4, and AP#4 finds the color value wildcard carried in the BSS_color field carried by the Probe Request frame #1, so It is determined that AP#4 has the right to reply to the corresponding Probe Response frame.
  • AP#4 randomly selects one subchannel among the plurality of subchannels of available channel #3 to transmit Probe Response frame #p4 corresponding to the Probe Request frame #1, and AP#4 may also be in multiple subchannels of available channel #4. One of the subchannels is randomly selected to transmit the Probe Response frame #p4 corresponding to the Probe Request frame #1.
  • STA#1 receives the Probe Response frame #p4 transmitted by the AP#4 randomly selected one of the plurality of subchannels of the available channel #3 in the available channel #3, wherein the STA#1 if the correct slave channel # 3 When the Probe Response frame #p4 is received, STA#1 transmits the acknowledgement frame #a4 for the Probe Response frame #p4 on the available channel #3.
  • STA#1 can receive the Probe Response frame #p4 transmitted by the AP#4 randomly selected one of the plurality of subchannels of the available channel #4 on the available channel #4, wherein the STA#1 if the correct slave channel is available #4 receives the Probe Response frame #p4, then STA#1 transmits the acknowledgement frame #a4 for the Probe Response frame #p4 on the available channel #4.
  • step S602 to step S603, step S604 to step S605, step S606 to step S607, and step S608 to step S609 may be performed in the same time period.
  • the STA can simultaneously perform frame transmission and reception on four available channels: the available channel #1, the available channel #2, the available channel #3, and the available channel #4.
  • the STA can also perform frame transmission and reception on a larger or smaller number of available channels at the same time, and the processing manner of the STA and the AP in the corresponding scenario can be deduced by analogy.
  • the STA can simultaneously perform frame transmission and reception with four APs, such as AP#1, AP#2, AP#3, and AP#4, for example, and STAs can also be more or less simultaneously.
  • the AP performs frame transmission and reception, and the processing methods of the STA and the AP in the corresponding scenario can be deduced by analogy.
  • FIG. 6-C A general scenario in which a STA simultaneously performs frame transmission and reception on multiple available channels and multiple APs may be exemplified in FIG. 6-C.
  • the STA can still trigger the active scanning again according to the actual situation of the system, for example, the STA can trigger the active scanning according to the number of competitive collisions of the probe response frames replied by the AP.
  • the main process is similar to the above example process.
  • the AP since the available channel can be logically divided into multiple subchannels, the AP respectively receives the multiple subchannels of the corresponding available channel after the STA sends the Probe Request frame on multiple available channels. Randomly selecting one subchannel to send a Probe Response frame corresponding to a Probe Request frame, so even if there are multiple APs in the same available channel in some scenarios Sending a Probe Response frame, if multiple APs send Probe Response frames on different subchannels of the same available channel in the same time period, it is beneficial to avoid the competitive collision of the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can randomly select one subchannel to reply to the corresponding Probe Response frame in multiple subchannels of the available channel of the Probe Request frame, and the innovative mechanism is regarded as an asymmetric asymmetric probe.
  • Response frame reply mechanism compared with the traditional symmetric Probe Response frame reply mechanism, this mechanism is beneficial to reduce the number of competitive collisions between APs, and is beneficial to reduce competition overhead and waste of communication resources, thereby contributing to improving the overall performance of the wireless system.
  • an embodiment of the present invention further provides an access point 700, which may include: a receiving unit 710 and a sending unit 720.
  • the receiving unit 710 is configured to receive, in the first available channel, a probe request frame sent by the station.
  • the sending unit 720 is configured to send, according to one of the plurality of subchannels of the first available channel, a probe response frame corresponding to the probe request frame.
  • one subchannel may be equivalent to one or more resource units.
  • the receiving unit 710 is further configured to receive, on the first available channel, an acknowledgement frame sent by the station for the probe response frame.
  • the sending unit is specifically configured to randomly select one of the plurality of subchannels of the first available channel to send a probe response corresponding to the probe request frame. frame.
  • the probe request frame carries a subchannel division indication; the access point further includes a channel determination unit 730, configured to determine, according to the subchannel division indication The first available channel is divided into a plurality of subchannels.
  • the subchannel division indication may be carried in an AP configuration information field carried in a Probe Request frame, where the AP Configuration information field may be carried in, for example, the HE-SIG-B ( The Efficient Signaling-B) field is either carried elsewhere in the Probe Request frame.
  • AP Configuration information field may be carried in, for example, the HE-SIG-B ( The Efficient Signaling-B) field is either carried elsewhere in the Probe Request frame.
  • the access point further includes channel determining The unit 730 is configured to divide the first available channel into multiple subchannels based on protocol configuration information.
  • the value of the basic service unit color field carried by the probe request frame is set to a wildcard or a specified color value, where the basic service unit color field is used to indicate basic Service unit.
  • the basic service unit color field is carried in an Efficient Signaling-A field or an Efficient Signaling-B field of the high efficiency preamble of the probe request frame.
  • the access point is the specified color value. Corresponding access point.
  • the receiving unit is specifically configured to receive, at the first available channel, the station in the first available channel An acknowledgement frame for the probe response frame transmitted in an orthogonal frequency division multiple access mode or a multicast mode or a broadcast mode.
  • the receiving unit 710 is further configured to receive, by using the second available channel, the probe request frame sent by the station;
  • the sending unit 720 is further configured to send, according to one of the plurality of subchannels of the second available channel, a probe response frame corresponding to the probe request frame;
  • the receiving unit 710 is further configured to receive, on the second available channel, an acknowledgement frame sent by the station for the probe response frame.
  • the function of the access point 700 in this embodiment may be specifically implemented according to the method in the foregoing method embodiment.
  • the AP 700 is available in the first available after receiving the Probe Request frame sent by the STA on the first available channel.
  • One of the plurality of subchannels of the channel transmits a Probe Response frame corresponding to the Probe Request frame, so even if there are multiple APs in the same available channel in a certain scenario, Sending a Probe Response frame, if multiple APs are transmitting Probe Response frames on different subchannels of the same available channel in the same time period, it is advantageous to avoid the competitive collision of the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can reply to the corresponding Probe Response frame in one subchannel of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric asymmetric Probe Response frame reply.
  • this mechanism is beneficial to reduce the number of competitive collisions between APs, thereby reducing the competition overhead and waste of communication resources, and thus improving the overall performance of the wireless system.
  • an embodiment of the present invention further provides an access point 800, including: a processor 810, a memory 820, and an antenna 830.
  • the processor 810 is configured to perform the following steps by calling an instruction or a code stored in the memory 820:
  • one subchannel may be equivalent to one or more resource units.
  • the processor is specifically configured to randomly select one of the plurality of subchannels of the first available channel to send a probe response corresponding to the probe request frame. frame.
  • the probe request frame carries a subchannel division indication
  • the processor is further configured to divide the first available channel into Multiple subchannels.
  • the access point further includes a channel determining unit, configured to divide the first available channel into multiple subchannels based on protocol configuration information.
  • the value of the basic service unit color field carried by the probe request frame is set to a wildcard or a specified color value, where the basic service unit color field is used to indicate basic Service unit.
  • the basic service unit color word The segment is carried in the Efficient Signaling-A field or the Efficient Signaling-B field of the high efficiency preamble of the probe request frame.
  • the access point is the specified color value. Corresponding access point.
  • the processor is specifically configured to: receive, by using the antenna, the orthogonal available frequency on the first available channel by using the antenna on the first available channel.
  • An acknowledgment frame for the probe response frame transmitted in a multiple access mode or a multicast mode or a broadcast mode.
  • the processor is further configured to receive, by using the antenna, the probe request frame sent by the station on a second available channel; Sending, by one of the plurality of subchannels of the second available channel, a sounding response frame corresponding to the sounding request frame; receiving, by the antenna, the acknowledgement frame sent by the station for the sounding response frame on the second available channel .
  • the function of the access point 800 in this embodiment may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to the related description of the foregoing method embodiment, and details are not described herein again.
  • the AP 800 is available in the first available after receiving the Probe Request frame sent by the STA on the first available channel.
  • One of the plurality of subchannels of the channel transmits a Probe Response frame corresponding to the Probe Request frame, so even if multiple APs in a certain scenario send a Probe Response frame on the same available channel, if multiple APs are in the same time period, Sending a Probe Response frame on different subchannels of the same available channel is beneficial to avoid competing collisions of the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can reply to the corresponding Probe Response frame in one subchannel of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric asymmetric Probe Response frame reply.
  • this mechanism is beneficial to reduce the number of competitive collisions between APs, thereby reducing the competition overhead and waste of communication resources, and thus improving the overall performance of the wireless system.
  • an embodiment of the present invention further provides a site 900, including:
  • the sending unit 910 is configured to send a probe request frame on the first available channel.
  • the receiving unit 920 is configured to receive, on the first available channel, a probe response frame corresponding to the probe request frame sent by the access point on one of the plurality of subchannels of the first available channel;
  • the sending unit 930 is further configured to send an acknowledgement frame for the probe response frame on the first available channel.
  • the detecting, by the first available channel, the probe request sent by an access point on one of the plurality of subchannels of the first available channel includes: a probe response frame corresponding to the probe request frame sent by the first available channel receiving access point on one of the plurality of subchannels of the first available channel.
  • the probe request frame carries a subchannel division indication, where the subchannel division indication is used to indicate that the access point is to use the first available channel.
  • the subchannel division indication is used to indicate that the access point is to use the first available channel.
  • Divided into multiple subchannels For example, one subchannel may be equivalent to one or more resource units.
  • the value of the basic service unit color field carried by the probe request frame is set to a wildcard or a specified color value, where the basic service unit color field is used to indicate basic Service unit.
  • the basic service unit color field is carried in an Efficient Signaling-A field or an Efficient Signaling-B field of the high efficiency preamble of the probe request frame.
  • the access point is the specified color value. Corresponding access point.
  • the sending by the first available channel, an acknowledgement frame for the probe response frame: the sending unit is specifically configured to be used on the first available channel An acknowledgment frame for the probe response frame transmitted in an orthogonal frequency division multiple access mode or a multicast mode or a broadcast mode.
  • the sending unit is further configured to send the probe request frame on a second available channel
  • the receiving unit is further configured to receive, on the second available channel, a probe response frame corresponding to the probe request frame sent by the access point on one of the plurality of subchannels of the second available channel.
  • the sending unit is further configured to send an acknowledgement frame for the probe response frame on the second available channel.
  • the product form of the site 900 of the embodiment may be, for example, a product form of a tablet computer, a notebook computer, a mobile internet device, a palmtop computer, a desktop computer, a mobile phone, or other user terminals.
  • the function of the station 900 in this embodiment may be specifically implemented according to the method in the foregoing method embodiment.
  • the specific implementation process reference may be made to the related description of the foregoing method embodiment, and details are not described herein again.
  • the available channel (such as the first available channel) can be logically divided into multiple subchannels, and after the first available channel receives the Probe Request frame sent by the STA 900, the AP is in the first available channel.
  • One of the plurality of subchannels transmits a Probe Response frame corresponding to the Probe Request frame, so even if multiple APs in a certain scenario send a Probe Response frame on the same available channel, if multiple APs are in the same time period, Sending a Probe Response frame on different subchannels of the available channel helps to avoid competing collisions of the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can reply to the corresponding Probe Response frame in one subchannel of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric asymmetric Probe Response frame reply.
  • this mechanism is beneficial to reduce the number of competitive collisions between APs, thereby reducing the competition overhead and waste of communication resources, and thus improving the overall performance of the wireless system.
  • an embodiment of the present invention further provides a site site 1000, including:
  • Processor 1010 memory 1020, and antenna 1030.
  • the processor 1010 is configured to: send, by using the antenna 1030, a probe request frame on a first available channel by using the instruction or the code stored in the memory 1020; Receiving, by the available channel, a probe response frame corresponding to the probe request frame sent by the access point on one of the plurality of subchannels of the first available channel; transmitting, by the antenna, on the first available channel for the The confirmation frame of the probe response frame.
  • the processor is configured to receive, by using the antenna, the access point on the first available channel, randomly selected among multiple subchannels of the first available channel.
  • one subchannel may be equivalent to one or more resource units.
  • the probe request frame carries a subchannel division indication, where the subchannel division indication is used to indicate that the access point is to use the first available channel. Divided into multiple subchannels.
  • the value of the basic service unit color field carried by the probe request frame is set to a wildcard or a specified color value, where the basic service unit color field is used to indicate basic Service unit.
  • the basic service unit color field is carried in an Efficient Signaling-A field or an Efficient Signaling-B field of the high efficiency preamble of the probe request frame.
  • the access point is the specified color value. Corresponding access point.
  • the processor is configured to send, by using, the antenna, in an orthogonal frequency division multiple access manner or a multicast manner or a broadcast manner on the first available channel by using the antenna.
  • the acknowledgment frame of the probe response frame is configured to send, by using, the antenna, in an orthogonal frequency division multiple access manner or a multicast manner or a broadcast manner on the first available channel by using the antenna.
  • the processor is further configured to send, by using the antenna, the probe request frame on a second available channel, and receive, by the antenna, on the second available channel.
  • a probe response frame corresponding to the probe request frame sent by the access point on one of the plurality of subchannels of the second available channel; and the probe response frame is sent by the antenna on the second available channel Confirmation frame.
  • the product form of the site 1000 of the embodiment may be, for example, a product form of a tablet computer, a notebook computer, a mobile internet device, a palmtop computer, a desktop computer, a mobile phone, or other user terminals. It can be understood that the function of the site 1000 in this embodiment may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to the related description of the foregoing method embodiment, where No longer.
  • the AP since the available channel (such as the first available channel) can be logically divided into multiple subchannels, the AP is available in the first available after receiving the Probe Request frame sent by the STA 1000 on the first available channel.
  • One of the plurality of subchannels of the channel transmits a Probe Response frame corresponding to the Probe Request frame, so even if multiple APs in a certain scenario send a Probe Response frame on the same available channel, if multiple APs are in the same time period, Sending a Probe Response frame on different subchannels of the same available channel is beneficial to avoid competing collisions of the multiple APs.
  • the foregoing solution in the embodiment introduces an innovative mechanism that the AP can reply to the corresponding Probe Response frame in one subchannel of the available channel of the Probe Request frame, and the innovative mechanism can be regarded as an asymmetric asymmetric Probe Response frame reply.
  • this mechanism is beneficial to reduce the number of competitive collisions between APs, thereby reducing the competition overhead and waste of communication resources, and thus improving the overall performance of the wireless system.
  • an embodiment of the present invention further provides a communication system, including:
  • Access point 1110 and site 1120 can be any access point provided by the embodiment of the present invention.
  • the site 1120 can be any one of the sites provided by the embodiment of the present invention.
  • the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium can store a program, and the program includes some or all of the steps of any one of the active scanning processing methods described in the foregoing method embodiments.
  • the disclosed apparatus may be implemented in other ways.
  • the device embodiments described above are merely illustrative, such as the above single
  • the division of elements is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.
  • the units described above as separate components may or may not be physically separated.
  • the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the above-described integrated unit if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium.
  • the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, server or network device, etc., and in particular a processor in a computer device) to perform all or part of the steps of the above-described methods of various embodiments of the present invention.
  • the foregoing storage medium may include: a U disk, a mobile hard disk, a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), and the like. The medium of the code.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de traitement par balayage actif et un dispositif associé, et un système de communication. Le procédé de traitement par balayage actif comprend les étapes suivantes : un point d'accès envoie, au niveau d'une station de réception d'un premier canal disponible, une trame de demande de détection ; le point d'accès envoie, au niveau d'un sous-canal de multiples sous-canaux du premier canal disponible, une trame de réponse de détection correspondant à la trame de demande de détection ; et le point d'accès reçoit, au niveau du premier canal disponible, une trame d'accusé de réception envoyée par la station par rapport à la trame de réponse de détection. La solution technique fournie par le mode de réalisation de la présente invention permet avantageusement de réduire le nombre de collisions résultant d'une compétition entre les points d'accès et de réduire en outre le surdébit de compétition ainsi que le gaspillage de ressources de communication, et d'améliorer les performances globales d'un système.
PCT/CN2016/096634 2015-09-09 2016-08-25 Procédé de traitement par balayage actif et dispositif associé, et système de communication Ceased WO2017041629A1 (fr)

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