WO2018054169A1 - Procédé et dispositif de commutation de canal - Google Patents

Procédé et dispositif de commutation de canal Download PDF

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Publication number
WO2018054169A1
WO2018054169A1 PCT/CN2017/095266 CN2017095266W WO2018054169A1 WO 2018054169 A1 WO2018054169 A1 WO 2018054169A1 CN 2017095266 W CN2017095266 W CN 2017095266W WO 2018054169 A1 WO2018054169 A1 WO 2018054169A1
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WIPO (PCT)
Prior art keywords
sta
receiving address
key
wur frame
channel
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PCT/CN2017/095266
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English (en)
Chinese (zh)
Inventor
程勇
方平
庞高昆
丁志明
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华为技术有限公司
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Priority to CN201780036640.XA priority Critical patent/CN109314925B/zh
Publication of WO2018054169A1 publication Critical patent/WO2018054169A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiments of the present invention relate to the field of wireless communications technologies, and in particular, to a method and a device for channel switching.
  • a Basic Service Set (BSS) for Wireless Fidelity (Wi-Fi) networks defined in the 802.11 standard of the Institute of Electrical and Electronics Engineers (IEEE) includes an access point ( Access Point, AP) and one or several Wi-Fi stations (Station, STA).
  • the user can select and set the frequency band and channel of the AP.
  • the working frequency band is 2.4 GHz and the working channel is Channel 11.
  • a BSS's working channel may need to switch from one channel to another.
  • the working environment of a wearable Wi-Fi network may change frequently, which may result in the wearable Wi-Fi network needing to frequently switch working channels. If the existing working channel of a BSS is seriously interfered, the AP needs to switch the working channel and the associated STA in time to ensure that the message can be completed in time when there is a message or emergency message between the AP and the STA. The transmission of the message.
  • the channel switch of the BSS can be automatically completed by the AP.
  • the process of working channel switching is defined in the IEEE 802.11 standard.
  • the AP can notify the AP associated STA by broadcasting a beacon frame or an action frame, for example, by using a channel switch announcement element (Channel Switch Announcement Element).
  • the STA's Wi-Fi interface may be in most of the time. Deep sleep state (such as receiving transmitter off state), can not receive messages. Since the STA sleeps (such as the receiving transmitter of the STA's main communication interface is turned off), the Wi-Fi interfaces of all the STAs in one BSS may not be in the working state (such as the receiving state) at the same time. In this way, if the communication environment changes and the AP decides to switch the working channel, the AP may not be able to directly broadcast the Channel Switch Announcement Element through the Wi-Fi interface.
  • WUR Wake-up Radio/Receiver
  • the AP first passes the WUR frame to indicate that the auxiliary wake-up interface of all STAs associated with it wakes up the Wi-Fi interface; then broadcasts the working channel switching indication message through the Wi-Fi interface.
  • the AP first wakes up the Wi-Fi interface of its associated STA through the WUR frame; then sends a working channel switching indication message to the Wi-Fi interface.
  • the STA; the AP sends a working channel switching indication message to its associated STAs one by one.
  • the embodiment of the present invention provides a method and a device for channel switching, which can send a channel switching indication message of a main communication interface (such as a Wi-Fi interface) to an associated STA in time by sending a WUR frame, thereby avoiding the AP sending a channel. Switching the indication message and awakening the operation of the STA's main communication interface saves the STA's power.
  • a main communication interface such as a Wi-Fi interface
  • an embodiment of the present application provides a method for channel switching.
  • the method includes: the AP sends a WUR frame, where the WUR frame includes a first receiving address, a channel identifier, and check information.
  • the first receiving address includes a broadcast address or a bit sequence of the auxiliary wake-up interface of the at least one STA, where the first receiving address is generated by the AP according to at least a Time Synchronization Function (TSF) and a key; the key is an AP and At least one STA has agreed or negotiated information, each STA of at least one STA has at least one auxiliary wake-up interface and one main communication interface;
  • the WUR frame is used to indicate that the STA of the auxiliary wake-up interface corresponding to the first received address is The working channel of the STA's main communication interface is switched to the channel corresponding to the channel identifier; the first receiving address is used to indicate the target receiver of the WUR frame; the check information is used by the target receiver of the WUR frame to use the check information
  • the AP sends a channel switching indication message of the primary communication interface to the associated STA in time by sending the WUR frame.
  • the primary communication interface of the STA may not use the channel switching indication message sent by the AP only.
  • the channel used by the communication interface for subsequent communication is awakened, but only needs to be woken up when it needs to perform data transmission with the main communication interface of the AP, and according to the channel switching indication message received by the WUR interface of the previous STA.
  • the correct channel is selected to communicate with the AP's main communication interface, thereby avoiding the AP's operation of waking up the STA's main communication interface by transmitting a channel switching indication message, thereby saving power.
  • the receiving address and the check information may be carried in the WUR frame, and the target receiver is indicated by receiving the address, and further, the AP and the STA may reduce the receiving and processing the repeated channel switching indication by using the periodically updated receiving address.
  • the probability of the message is verified by the verification information to verify the correctness of the content in the WUR frame, etc., so that the probability of receiving and processing the channel switching indication message maliciously replayed by the attacker can be reduced, so that the STA can save more energy.
  • the first receiving address further includes: information used to indicate a basic service set BSS in which the AP is located.
  • the STA can determine whether the sending end of the WUR frame is in a BSS with itself, so as to further determine whether the target recipient is itself or not, and the possibility that the WUR frame is correctly received is improved. It is also possible to reduce the STA receiving unrelated WUR frames and reducing the power consumption of the STA.
  • the verification information includes a authenticity check code MIC.
  • the STA may reduce the possibility of being attacked.
  • the verification information is determined based at least on the working channel and key of the primary communication interface.
  • an embodiment of the present application provides a channel switching method.
  • the STA has at least one auxiliary wake-up interface and one main communication interface.
  • the method specifically includes: the STA receives the WUR frame sent by the AP through the auxiliary wake-up interface, where the WUR frame includes a first receiving address, a channel identifier, and check information.
  • the first receiving address includes a broadcast address of the auxiliary wake-up interface of the STA or a bit sequence, and the first receiving address is generated by the AP according to at least a time synchronization function TSF and a key, and the key is information that the AP and the STA have agreed or negotiated.
  • the WUR frame is used to indicate that the STA where the auxiliary wake-up interface corresponding to the first receiving address is located switches the working channel of the STA's main communication interface to the channel corresponding to the channel identifier, and the first receiving address is used to indicate the target receiver of the WUR frame; Generating a second receiving address according to the TSF and the key; when the first receiving address matches the second receiving address, the STA uses the verification information to verify the correctness of the content including the channel identifier in the WUR frame; after the verification is passed, The STA records the channel identifier carried in the WUR frame, so that when the AP and the STA need to communicate, the STA's main communication interface communicates with the AP through the channel corresponding to the recorded channel identifier.
  • the channel switching indication message of the primary communication interface is determined by the received WUR frame, which avoids the operation of the AP to wake up the STA's primary communication interface because the channel switching indication message is sent, thereby saving power.
  • the WUR frame carries the receiving address and the check information, and the target receiver is indicated by the receiving address, and the AP and the STA periodically update the receiving address, so that the probability of receiving and processing the repeated channel switching indication message can be reduced, and the verification is performed.
  • the information to verify the correctness and/or authenticity of the content in the WUR frame can reduce the probability of receiving and processing the channel switching indication message maliciously replayed by the attacker, so that the STA can save more energy.
  • the foregoing STA generates the second receiving address according to the time synchronization function TSF and the key, including: the STA subtracts the high M bit of the difference of 2 N according to the TSF, and the key is obtained by a hash operation or an encryption operation.
  • the time synchronization operation means that the AP sends TSF information to the STA, so that the TSF information of the STA is the same as the TSF information of the AP.
  • the first receiving address further includes: information used to indicate a basic service set BSS where the AP is located.
  • the verification information includes a authenticity check code MIC.
  • the verification information is determined based at least on the working channel and key of the primary communication interface.
  • an embodiment of the present application provides an AP.
  • the AP specifically includes: a transceiver, configured to send a WUR frame, where the WUR frame includes a first receiving address, a channel identifier, and check information, where the first receiving address includes a broadcast address of the auxiliary wake-up interface of the at least one STA or a a bit sequence, the first receiving address is generated by the AP according to at least a time synchronization function TSF and a key, the key being information that the AP has agreed or negotiated with the at least one STA, the at least one Each STA in the STA has at least one auxiliary wake-up interface and one main communication interface, and the WUR frame is used to indicate that the STA where the auxiliary wake-up interface corresponding to the first receiving address is located will work on the STA's main communication interface.
  • the channel is switched to a channel corresponding to the channel identifier, the first receiving address is used to indicate a target receiver of the WUR frame, and the verification information is used by a target receiver of the WUR frame to use the verification information.
  • the processor configured to use the channel corresponding to the channel identifier and the at least one STA communication.
  • the first receiving address according to the time synchronization function TSF and the key generation includes:
  • the first receiving address is obtained by subtracting the high M bit of the difference of 2 N according to the TSF and the key is obtained by a hash operation or an encryption operation, wherein N and M are integers, and N and M are times by the AP and the STA.
  • the time synchronization operation means that the AP sends TSF information to the STA, so that the TSF information of the STA is the same as the TSF information of the AP.
  • the first receiving address further includes: information used to indicate a basic service set BSS in which the AP is located.
  • the verification information includes a authenticity check code MIC.
  • the verification information is determined based at least on a working channel of the primary communication interface and the key.
  • the embodiment of the present application provides a STA, where the STA has at least one auxiliary wake-up interface and one main communication interface, and the method includes: the auxiliary wake-up interface, configured to receive an AP sending a WUR frame, the WUR frame includes a first receiving address, a channel identifier, and check information, where the first receiving address includes a broadcast address or a bit sequence of the STA's auxiliary wake-up interface, and the first receiving address is
  • the AP is generated according to at least a time synchronization function TSF and a key, where the key is information that the AP has agreed or negotiated with the STA, and the WUR frame is used to indicate an auxiliary corresponding to the first receiving address.
  • the STA where the awake interface is located switches the working channel of the STA's main communication interface to the channel corresponding to the channel identifier, the first receiving address is used to indicate the target receiver of the WUR frame, and the processor is configured to The TSF and the key generate a second receiving address; the processor is further configured to: when the first receiving address matches the second receiving address, use the verification information to Accuracy and / or authenticity WUR frame content comprises at least the channel identifier is verified; the primary communication interface used after the verification by the channel identifier corresponding to a channel to communicate with the AP.
  • the STA generates the second receiving address according to the time synchronization function TSF and the key, including:
  • the time synchronization operation means that the AP sends TSF information to the STA, so that the TSF information of the STA is the same as the TSF information of the AP.
  • the first receiving address further includes: information used to indicate a basic service set BSS in which the AP is located.
  • the verification information includes a authenticity check code MIC.
  • the verification information is determined based at least on a working channel of the primary communication interface and the key.
  • a non-volatile storage medium is provided.
  • One or more program codes are stored in a non-volatile storage medium.
  • the processor of the AP in the seventh aspect executes the program code, the AP performs the A method for channel switching in one aspect and various alternatives of the second aspect.
  • another non-volatile storage medium in which one or more program codes are stored in a non-volatile storage medium.
  • the processor of the STA in the seventh aspect executes the program code, the STA performs, for example, The second aspect and the method for channel switching in various alternatives of the second aspect.
  • a computer program product is provided.
  • the AP sends the WUR frame to send the channel switching indication message of the main communication interface to the associated STA in time, thereby avoiding the operation of the AP to wake up the STA's main communication interface because the channel switching indication message is sent, thereby saving the STA.
  • Electrical energy may be carried in the WUR frame, and the target receiver is indicated by the receiving address, and the AP and the STA reduce the probability of receiving and processing the repeated channel switching indication message by periodically updating the receiving address.
  • the verification information is used to verify the correctness of the content in the WUR frame, etc., and the probability of receiving and processing the channel switching indication message maliciously replayed by the attacker is reduced, so that the STA can save more energy.
  • Figure 1 is a schematic diagram of a scene
  • FIG. 2 is a schematic diagram of signaling interaction of a channel switching method according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of a WUR frame according to an embodiment of the present application.
  • Figure 4 is an example provided by an embodiment of the present application.
  • FIG. 5 is another example provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of signaling interaction of another channel switching method according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of an access point according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a station according to an embodiment of the present application.
  • the method and device for channel switching provided by the embodiments of the present application are applied to channel switching between an AP and an STA in a wireless communication process.
  • FIG. 1 is a schematic diagram of a scene.
  • the Wi-Fi network includes: an AP 10 and at least one STA 20.
  • the STA 20 includes a main communication interface (such as an interface provided by a Wi-Fi module) and an auxiliary wake-up interface (such as an interface provided by the WUR module).
  • the auxiliary wake-up interface in the STA After receiving the wake-up frame sent by the AP, the auxiliary wake-up interface in the STA sends a wake-up signal to the primary communication interface in the STA, and activates the primary communication interface in the sleep mode, so that the primary communication interface receives the Wi-Fi from the AP. data. That is to say, when the main communication module of the STA 20 sleeps (for example, the transmitter is turned off), the WUR frame can be received through the auxiliary wake-up interface.
  • the WUR frame is a frame that the WUR interface can recognize and receive.
  • the embodiment of the present application discloses a method and device for channel switching.
  • the AP sends the WUR frame to send the channel switching indication message of the main communication interface to the associated STA in time, which avoids the operation of the AP to wake up the STA's main communication interface because the channel switching indication message is sent, thereby saving the STA's power.
  • the WUR frame carries the receiving address and the check information, indicates the target receiver by receiving the address, periodically replaces the receiving address used by the channel switching between the AP and the STA, and verifies the correctness of the content in the WUR frame by using the check information. Therefore, the STA can reduce the probability of receiving and processing the repeated channel switching indication message, and can also reduce the probability of receiving and processing the channel switching indication message maliciously replayed by the attacker, so that the STA can save more energy.
  • the STA in the embodiment of the present application may be an electronic terminal installed with a Wi-Fi module, and the electronic terminal may perform data interaction with the AP through the Wi-Fi network.
  • the electronic terminal can be a mobile phone, a PC, a handheld device, a pad, or the like.
  • the AP in the embodiment of the present application is not limited to a conventional access point, and the AP in the embodiment of the present application may be any communication device having an access point function, and the AP may perform data interaction with the STA through the Wi-Fi network.
  • the AP can In the case of a Wi-Fi router, the STA can be a user terminal such as a mobile phone or a computer; when the user terminal such as a mobile phone or a computer is set to the Wi-Fi hotspot mode and the Wi-Fi network is provided for other terminals, the mobile terminal or the user terminal such as a computer
  • the terminal connected to the Wi-Fi network provided by the AP is the STA.
  • the AP in the embodiment of the present application may be a user terminal such as a mobile phone or a computer
  • the STA may be a wearable device connected to a user terminal such as a mobile phone or a computer.
  • the embodiment of the present application provides a channel switching method. As shown in FIG. 2, the method specifically includes the following steps:
  • the AP sends a WUR frame, where the WUR frame includes a first receiving address, a channel identifier, and check information.
  • the first receiving address includes a broadcast address or a bit sequence of the auxiliary wake-up interface of the at least one STA, and the first receiving address is generated by the AP according to at least a time synchronization function TSF and a key, and the key is that the AP has agreed or negotiated with the at least one STA.
  • the STA of each of the at least one STA has at least one auxiliary wake-up interface and one main communication interface, and the WUR frame is used to indicate that the STA where the auxiliary wake-up interface corresponding to the first receiving address is located is the working channel of the STA's main communication interface.
  • the first receiving address is used to indicate the target receiver of the WUR frame
  • the verification information is used by the target receiver of the WUR frame to verify the correctness of the content including at least the channel identifier in the WUR frame by using the verification information. And/or authenticity is verified.
  • the STA's primary communication interface may be in a deep sleep state (eg, the transmitter is off) for most of the time and cannot receive messages. Since the STA sleeps (eg, the receiving transmitter of the STA's primary communication interface is turned off), the primary communication interfaces of all STAs within a BSS may not be woken up at the same time (eg, receiving state).
  • the AP determines that it is necessary to switch the working channel so as to be able to maintain the connection with the STA, the AP may not be able to directly broadcast the channel switch announcement message (Channel Switch Announcement Element).
  • the AP needs to switch the working channel and the STA associated with the notification in time to ensure that the message can be completed in time when the STA has a message or an urgent message needs to be sent to the AP.
  • the AP may send a WUR frame to at least one STA associated with the AP to notify its replaced channel.
  • FIG. 3 is an example of a WUR frame structure.
  • the WUR frame may include a legacy 802.11 Preamble, a Wake-up Preamble, a Control Info, a Network ID, a Receive Address, and a Master.
  • the channel ID and verification information of the communication interface may include a legacy 802.11 Preamble, a Wake-up Preamble, a Control Info, a Network ID, a Receive Address, and a Master.
  • the traditional 802.11 preamble is optional.
  • the legacy 802.11 preamble portion can be used for backward compatibility, so that the conventional Wi-Fi device can judge that the frame currently being transmitted is a Wi-Fi frame, thereby selecting a corresponding channel listening decision threshold and backoff time.
  • Control Info can be used to indicate the frame type of the WUR frame and other information, for example, indicating that the WUR frame is a channel switch indication message.
  • the receiving address is a broadcast address or a bit sequence of the auxiliary wake-up interface of at least one STA that is in the same basic service set as the AP, and is used to indicate a target receiver of the WUR frame, wherein the target recipient of the WUR frame may be a basic All STAs in the Service Set (BSS) with an auxiliary wake-up interface.
  • BSS Service Set
  • the network ID is optional.
  • the network identifier may be part of a receiving address; the network identifier may be identifier information of a basic service set, and is used to indicate an AP and a basic service set where the STA is located, for example, a BSS color, a BSSID, or Hashed BSSID or compressed BSSID and more.
  • the verification information may be a message integrity code (MIC) or a combination of a message authenticity check code and a frame check sequence (FCS); the check object of the check information includes the primary communication
  • the new working channel of the interface may also include control information, network identification, and receiving address.
  • the verification information includes both the MIC and the FCS
  • the MIC is used to help the receiving end verify the authenticity of the check object in the WUR frame
  • the FCS is used to help the receiver verify the correctness of the check object in the WUR frame, that is, check
  • the content of the received WUR has no error during the transmission
  • the verification information only includes the MIC the MIC is used to help the receiving end verify the authenticity and correctness of the check object in the WUR frame.
  • the wake-up preamble, control information, network identification, receiving address, working channel identification and verification information of the main communication interface are On-Off Keying (OOK) modulation.
  • OOK On-Off Keying
  • the STA generates a second receiving address according to the TSF and the key.
  • the STA needs to receive the WUR frame using a second receiving address generated according to the TSF and a key negotiated with the AP. Specifically, the STA determines whether the target receiving address of the WUR frame is itself by matching the second receiving address with the first receiving address. When the second receiving address matches the first receiving address, it is determined that the target recipient of the WUR frame is itself. When the second receiving address does not match the first receiving address, it is determined that the target recipient of the WUR frame is not itself. When the STA determines that the target recipient of the WUR frame is not itself, the processing of the WUR frame is ended.
  • the second receiving address of the STA and the first receiving address of the AP need to be generated synchronously.
  • the synchronous generation means that the method and time of the STA generating the second receiving address are the same as the method and time for the AP to generate the first receiving address.
  • the same generation time means that the STA determines the generation time of the second reception address by using the TSF of the STA, and the AP determines the generation time of the first reception address by using the TSF of the AP, and both the STA and the AP assume that their TSFs are the same (the actual Their TSF may be different).
  • the second receiving address of the STA and the first receiving address of the AP may be periodically generated and updated, and the period may be greater than a difference between a time when the STA generates the second receiving address and a moment when the AP generates the first receiving address, which is smaller than Equal to the minimum frequency of channel switching.
  • the AP generates a first receiving address that needs to be used for the next channel switching after each time the WUR frame is sent, and the STA generates the next receiving and carrying channel switching information every time after receiving the WUR frame.
  • the second receiving address is required for the WUR frame, and the STA and the AP generate the same method for receiving the address.
  • the time synchronization operation means that the AP sends TSF information to the STA, so that the TSF information of the STA is the same as the TSF information of the AP.
  • the STA may generate a second receiving address before receiving the WUR frame for channel switching so as to be able to correctly receive the WUR frame.
  • the STA uses the verification information to verify the correctness of the content including at least the channel identifier in the WUR frame.
  • the STA After determining that the target receiver of the WUR frame is itself, the STA needs to verify the authenticity and/or correctness of the WUR frame. Specifically, the check object in the WUR frame is verified by the check information carried in the WUR frame.
  • the STA uses the MIC to verify the authenticity of the verification object in the WUR frame, and verifies the correctness of the verification object in the WUR frame through the FCS, that is, checks the received Inside WUR Whether there is any error in the transmission process; when the verification information only includes the MIC, the STA verifies the authenticity and correctness of the check object in the WUR frame through the MIC.
  • the AP communicates with the STA by using a channel corresponding to the channel identifier.
  • the STA may save the channel identifier in the WUR frame.
  • the STA can wake up its main communication interface, and the STA uses the channel corresponding to the latest channel identifier saved when communicating with the main communication interface of the AP through the wake-up main communication interface of the STA.
  • the AP performs data transmission and reception.
  • the STA may receive multiple WUR frames for channel switching within a period of time. If the STA has received a correct and true WUR frame for channel switching, the STA will no longer receive and process other WUR frames for channel switching during that time period; wherein the time period refers to the AP
  • the minimum time interval for channel switching twice in succession may be 67.11 seconds.
  • the working channel used by the STA's main communication interface is the working channel of the main communication interface recorded by the STA, that is, the working channel carried in the WUR frame for channel switching.
  • the working channel switching of the main communication interface may be performed multiple times, and the STA needs to select the channel corresponding to the channel identifier of the main communication interface saved by the last channel switching and the AP. Communication.
  • the timing of receiving the address generation may also be that after the AP sends the WUR frame for channel switching, the receiving address or a one to be carried in the next channel switching message (eg, the WUR frame carrying the channel identifier) is generated.
  • the bit sequence correspondingly, after receiving a correct and true channel switching indication message, the STA may generate a receiving address or a bit sequence used when receiving the next WUR frame for channel switching.
  • the method of newly generating a receiving address by the STA is the same as the method of newly generating a receiving address by the AP.
  • the channel switching indication message can make the STA more energy efficient.
  • the receiving address for the first channel switching between the AP and the STA may be sent by the AP to the STA during or after the AP establishes a secure connection with the STA, or during the establishment of a secure connection between the AP and the STA. Or when completed, the AP and the STA each generate a receiving address for the first channel switching.
  • the AP sends the WUR frame to send the channel switching indication message of the main communication interface to the associated STA in time, thereby avoiding the operation of the AP to wake up the STA's main communication interface because the channel switching indication message is sent, thereby saving the STA. Electrical energy.
  • the WUR frame carries the receiving address and the check information, indicates the target receiver by receiving the address, and periodically replaces the receiving address used by the AP and the STA for each channel switching, and verifies the content in the WUR frame by verifying the information.
  • the correctness and/or authenticity whereby the STA can reduce the probability of receiving and processing the repeated channel switching indication message, and can also reduce the probability of receiving and processing the channel switching indication message maliciously replayed by the attacker, so that the STA can save more energy. Consumption.
  • FIG. 4 is an example provided by an embodiment of the present application.
  • an AP or an STA may generate a channel switch according to a time synchronization function (TSF) or a current receive address (Receive Address) and a key (Key). Fill in the receiving address.
  • TSF time synchronization function
  • Receiveive Address current receive address
  • Key key
  • the algorithm in the example shown in FIG. 4 may be a hash algorithm or an encryption algorithm.
  • the key in the example shown in FIG. 4 is a key negotiated by the AP and the STA, and may be, for example, a Group Temporal Key (GTK).
  • GTK Group Temporal Key
  • the AP and the STA use the high order of the time synchronization function (TSF), as shown in FIG.
  • TSF time synchronization function
  • the AP and all its associated STAs do a time synchronization operation in one day (24 hours), and the accuracy of the AP and STA crystals is ⁇ 100ppm, then the time synchronization of the AP and STA in one day (24 hours)
  • the biggest difference in the function is 17.28 seconds.
  • the lower 25 bits of the Time Synchronization Function (TSF) can represent a maximum time value of approximately 33.55 seconds.
  • the AP's "TSF minus the difference of the high 25 bits of 2 25 " and the STA's "TSF minus the difference of 2 25 38" Bits are always the same.
  • the upper bit of the time synchronization function (TSF) may be "TSF minus the high 38 bits of the difference of 2 25 ".
  • the minimum time interval of the two consecutive Wi-Fi working channel switching needs to be greater than 67.11 seconds.
  • FIG. 5 is another example provided by the embodiment of the present application.
  • an attacker replays a channel switching indication message and modifies a working channel of a Wi-Fi interface during replay (Channel) ID), causing the STA to incorrectly switch the working channel, not knowing the real working channel of the Wi-Fi interface of the AP, and the verification object of the verification information needs to include at least the working channel (Channel ID) of the Wi-Fi interface, ie
  • the AP needs to generate the verification information according to at least a channel ID and a key of the Wi-Fi interface.
  • the verification information generation algorithm shown in FIG. 5 may be a hash algorithm or an encryption algorithm; the key (Key) shown in FIG. 5 may be a group temporary key (GTK) or other AP.
  • the key for generating the receiving address and the key for generating the verification information may be the same key, or may be different keys secretly negotiated by the AP and the STA respectively.
  • the embodiment of the present application provides another channel switching method.
  • the method shown in FIG. 6 specifically includes the following steps:
  • S610 The AP establishes a secure connection with the STA, and the AP sends the first receiving address to the STA through the secure connection.
  • the receiving address in the first channel switching indication message sent by the AP may be generated and sent by the AP to the STA after establishing a secure connection with the STA.
  • the AP sends a first WUR frame, where the first WUR frame includes a first receiving address, a first channel identifier, and first verification information.
  • the receiving address includes a broadcast address or a bit sequence of the auxiliary wake-up interface of the at least one STA, and the receiving address is generated by the AP according to at least a time synchronization function TSF and a key, wherein the first receiving address is used to indicate a target recipient of the first WUR frame .
  • the key is information that the AP has agreed or negotiated with the at least one STA.
  • Each STA of the at least one STA has at least one auxiliary wake-up interface and one main communication interface, where the first WUR frame is used to indicate the first receiving address.
  • the STA where the auxiliary wake-up interface is located switches the working channel of the STA's main communication interface to the channel corresponding to the channel identifier, and the check information is used by the target receiver of the first WUR frame to use the check information to include at least the channel identifier in the WUR frame. Verify the correctness and authenticity.
  • the process of the AP sending the first WUR frame may be as follows:
  • Step A The AP selects a working channel of a new primary communication interface according to the interference of the working channel of each primary communication interface.
  • Step B The AP generates a first WUR frame; the first WUR frame is a broadcast frame; and the format of the first WUR frame can be as shown in FIG. 3.
  • the first verification information may be MIC or MIC and FCS; the verification information may be used to help the receiving end verify the correctness and/or authenticity of the first WUR frame.
  • the specific generation manner of the verification information refer to the example described in conjunction with FIG. 5. Since the channel identifier and the receiving address are different, the obtained verification information may be different.
  • the AP sends the first WUR frame to all STAs in the Basic Service Set (BSS) (STAs supporting the auxiliary wake-up interface); in order to improve the first WUR frame, all STAs in the Basic Service Set (BSS) with the auxiliary wake-up interface are The probability of receiving, the AP may continuously transmit the channel switching indication message (ie, the first WUR frame) several times in succession.
  • BSS Basic Service Set
  • the channel switching indication message ie, the first WUR frame
  • the AP may switch the working channel of its primary communication interface to the new working channel; the new working channel and the identifier of the primary communication interface carried in the first WUR frame refer to The working channel is the same.
  • the process of the STA receiving the first WUR frame through the auxiliary wakeup interface may be as follows:
  • a first receiving address match is performed to determine whether the target recipient in the first WUR frame is itself.
  • the STA when receiving the first WUR frame, the STA first determines, according to the control information, that the frame being received is a channel switching indication message.
  • the STA continues to process the first WUR frame
  • the STA stops processing the first WUR frame.
  • the content in the first WUR frame is verified for correctness and/or authenticity.
  • the STA first generates the first check information of the first WUR frame locally, and the method for the STA to generate the check information is the same as the method for the AP to generate the check information.
  • the STA compares whether the locally generated first check information is the same as the first check information carried in the first WUR frame:
  • the STA continues to process the first WUR frame
  • the STA stops processing the first WUR frame.
  • the STA saves the first channel identifier.
  • the second receiving address is saved for use in determining the target recipient during the next channel switching process.
  • the first channel identifier is saved to perform data transmission with the AP through the primary communication interface when needed.
  • the second receiving address may be generated, and the second receiving address is sent to the STA in a secret manner.
  • the second receive address is used to indicate the target recipient of the next WUR frame.
  • the STA may receive multiple first WUR frames. If the STA has received a correct and true first WUR frame, the STA will not receive and process other first WUR frames in a period of time; the time period refers to the minimum time that the AP performs channel switching twice consecutively. Interval, for example, 67.11 seconds.
  • the working channel used by the STA's primary communication interface is the working channel of the primary communication interface recorded by the STA, that is, the working channel carried in the first WUR frame.
  • the channel switching may be performed multiple times. Each channel switching needs to perform the following steps:
  • the AP sends a second WUR frame to the at least one STA, where the second WUR frame includes a second receiving address, a second channel identifier, and second parity information.
  • the format of the second WUR frame can be as shown in FIG.
  • the STA uses the second check information to perform correctness on the content of the second WUR frame that includes at least the second channel identifier. verification.
  • the STA saves the second channel identifier.
  • the method further includes:
  • the STA communicates with the primary communication interface of the AP through the primary communication interface of the STA by using the channel corresponding to the latest channel identifier. Specifically, the STA may first wake up the primary communication interface of the STA (eg, may send a wake-up signal to the STA's main communication interface through the WUR module of the STA to wake it up), and then pass the wake-up of the STA's main The communication interface communicates with the primary communication interface of the AP.
  • the STA may first wake up the primary communication interface of the STA (eg, may send a wake-up signal to the STA's main communication interface through the WUR module of the STA to wake it up), and then pass the wake-up of the STA's main
  • the communication interface communicates with the primary communication interface of the AP.
  • the third receiving address may be generated, and the third receiving address is sent to the STA in a secret manner.
  • the third receiving address is used to indicate the target recipient of the next WUR frame.
  • the channel may be switched multiple times, and the STA needs to select the channel corresponding to the channel identifier saved by the last channel switch to communicate with the AP.
  • FIG. 7 is a schematic structural diagram of an access point according to an embodiment of the present application.
  • the AP 10 includes a processor 701, a memory 702, a transceiver 703, and a bus 704.
  • the processor 701, the memory 702, and the transceiver 703 are connected to each other through a bus 704.
  • the transceiver 703 can provide a main communication interface, such as a Wi-Fi interface, and the transceiver 703 can be a main communication module, and specifically can be an 802.11 module. Further, in some embodiments, the transceiver 703 may further provide an auxiliary communication interface, such as a WUR interface, that is, the transceiver 703 may further provide a function of transmitting a WUR frame.
  • the transceiver The 703 can include two parts, an 802.11 module and a WUR module.
  • the bus 704 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus.
  • PCI Peripheral Component Interconnect
  • EISA Extended Industry Standard Architecture
  • the bus 704 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 7, but it does not mean that there is only one bus or one type of bus.
  • the AP 10 can perform the associated method steps of the AP in the embodiment associated with any of Figures 2 and 6.
  • the embodiment of the present application further provides a non-volatile storage medium, where one or more program codes are stored, and when the processor 701 of the AP 10 executes the program code, the AP 10 executes FIG. 2 . And related method steps of the AP in any of the figures in FIG. 6.
  • each module or unit in the AP 10 provided by the embodiment of the present application and the technical effects brought by each module or unit performing the related method steps in any of FIG. 2 or FIG. 6 may refer to the present application.
  • the related description in the method embodiment is not described here.
  • FIG. 8 is a schematic structural diagram of a station according to an embodiment of the present application.
  • the STA 20 includes a processor 801, a memory 802, a WUR module 803, and a main communication module 804.
  • the processor 801, the memory 802, the WUR module 803, and the main communication module 804 can be connected to each other through a bus.
  • the bus can be a PCI bus or an EISA bus.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like.
  • the WUR module 803 provides the WUR interface, which is the same as the WUR module and the auxiliary wake-up module.
  • the main communication module 804 provides a primary communication interface, and the primary communication module 804 can be an 802.11 module.
  • the STA 20 may perform the associated method steps of the STA in the embodiment associated with any of Figures 2 and 6.
  • the embodiment of the present application further provides a non-volatile storage medium in which one or more program codes are stored.
  • the processor 801 of the STA 20 executes the program code
  • the STA 20 can execute FIG. 2 .
  • Figure 6 Related method steps of the STA in the embodiment related to any of the figures.
  • the auxiliary wake-up interface provided by the WUR module 1003 is configured to receive a WUR frame sent by the AP, where the WUR frame includes a first receiving address, a channel identifier, and check information, where the first receiving address includes a broadcast address of the STA's auxiliary wake-up interface.
  • the first receiving address is generated by the AP according to the time synchronization function TSF and the key, and the key is information that the AP and the STA have agreed or negotiated, and the WUR frame is used to indicate that the auxiliary wakeup interface corresponding to the first receiving address is located.
  • the STA switches the working channel of the STA's main communication interface to the channel corresponding to the channel identifier, where the first receiving address is used to indicate the target receiver of the WUR frame;
  • the processor 802 is configured to generate a second receiving address according to the TSF and the key;
  • the processor 802 is further configured to: when the first receiving address matches the second receiving address, use the verification information to correct the content of the WUR frame that includes at least the channel identifier and/or Verification of authenticity;
  • the main communication interface provided by the main communication module 804 is configured to communicate with the AP through the channel corresponding to the channel identifier after the verification is passed, that is, send data to the STA, or receive data sent by the STA.
  • each module in the STA 20 provided by the embodiment of the present application and the technical effects of each module performing the related method steps in any of FIG. 2 and FIG. 6 may be referred to in the method embodiment of the present application. The related description is not repeated here.
  • the size of the serial numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can 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 in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and 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 application 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 device configuration diagrams given in the various device embodiments of the present invention show only a simplified design of the corresponding device.
  • the device may include any number of transmitters, receivers, transceivers, processors, memories, main communication modules, WUR modules, etc., to implement the functions performed by the device in various embodiments of the present invention or Operation, and all devices that can implement the present application are within the scope of the present application.
  • the names of the message/frame/instruction information, modules, units, and the like provided in the embodiments of the present invention are merely examples, and other names may be used as long as the functions of the message/frame/instruction information, the module or the unit, and the like are the same.

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

Abstract

Selon un mode de réalisation, la présente invention concerne un procédé et un dispositif de commutation de canal. Le procédé comprend les étapes suivantes : un AP envoie une trame WUR, la trame WUR comprenant une première adresse de réception, une identification de canal et des informations de vérification. La première adresse de réception comprend une adresse de diffusion d'une interface de réveil auxiliaire d'au moins une STA ou une séquence aléatoire. Lorsque l'AP doit communiquer avec une interface de communication principale de la ou des STA, l'AP utilise un canal correspondant à l'identification de canal pour communiquer avec l'interface de communication principale de la ou des STA. Dans le mode de réalisation de la présente invention, un AP envoie une trame WUR pour envoyer en temps opportun un message d'indication de commutation de canal d'une interface de communication principale à une STA associée, et ainsi une opération de réveil de l'interface de communication principale de la STA requise par l'AP dans la transmission d'un message d'indication de commutation de canal est évitée et l'énergie électrique de la STA est économisée.
PCT/CN2017/095266 2016-09-26 2017-07-31 Procédé et dispositif de commutation de canal WO2018054169A1 (fr)

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