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WO2018032774A1 - 一种发送和接收wur帧的方法及设备 - Google Patents

一种发送和接收wur帧的方法及设备 Download PDF

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Publication number
WO2018032774A1
WO2018032774A1 PCT/CN2017/079078 CN2017079078W WO2018032774A1 WO 2018032774 A1 WO2018032774 A1 WO 2018032774A1 CN 2017079078 W CN2017079078 W CN 2017079078W WO 2018032774 A1 WO2018032774 A1 WO 2018032774A1
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WO
WIPO (PCT)
Prior art keywords
frame
wur
ofdm symbol
wake
preamble
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/079078
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English (en)
French (fr)
Inventor
程勇
方平
杜振国
丁志明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201780009127.1A priority Critical patent/CN108605291B/zh
Priority to EP17840750.8A priority patent/EP3499977B1/en
Publication of WO2018032774A1 publication Critical patent/WO2018032774A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • 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 present invention relates to the field of communications technologies, and in particular, to a method and device for transmitting and receiving a WUR frame.
  • the IEEE 802.11 standards organization recently established a Task Group (TG) to study ultra-low-power wake-up receiver (WUR) technology, which is expected to reduce the power consumption of Wi-Fi technology by waking up the receiver. Simultaneously achieve on-demand data transmission.
  • TG Task Group
  • WUR ultra-low-power wake-up receiver
  • WUR is a low-power receiver interface added to Wireless Fidelity (Wi-Fi) devices.
  • the device's main communication module such as Wi-Fi module
  • the auxiliary wake-up module such as WUR module
  • the first device a wake-up device, eg, an access point
  • the second device a wake-up device, eg, a station (STA)
  • the first device first goes to the second device
  • the WUR module sends a wake-up packet (WUP).
  • WUP wake-up packet
  • the WUR module of the second device After receiving the wake-up frame, the WUR module of the second device checks the receiver address of the wake-up frame and confirms the correctness and authenticity of the wake-up frame. If the recipient address of the wake-up frame matches the address of the WUR module of the second device, and the wake-up frame is authentic and correct, the WUR module of the second device may send a wake-up signal to the Wi-Fi communication module of the second device, To wake up the second device Wi-Fi communication module. After the wake-up signal is sent, the WUR module of the second device can choose to enter the sleep state. Compared with directly turning on the Wi-Fi module listening channel, using WUR can significantly reduce the power consumption of the device STA.
  • a WUR frame (for example, a WUR Beacon frame, or a wake-up frame WUP, etc.) is designed for the WUR module, and only the WUR module can recognize and receive the WUR frame.
  • the WUR frame in the prior art may include a legacy 802.11 Preamble (WUR Payload), where the legacy 802.11 preamble may include a traditional short training domain (non-High-Throughput Short).
  • WUR payload can include wake-up preamble and MAC part, wake-up preamble for symbol synchronization, WUR frame The initial identification and automatic gain control (AGC) adjustment, etc.; the MAC part may include a MAC header and a frame body (FB), and may further include a Frame Check Sequence (FCS).
  • AGC automatic gain control
  • FCS Frame Check Sequence
  • the unassociated STA2 (STA2 without the WUR module) is currently only a Wi-Fi interface. Since only the WUR module can receive the WUR frame in the prior art, the unassociated STA2 misses the opportunity to receive the WUR Beacon frame and the opportunity to discover the AP; in another possible application scenario, if the first device AP is currently The WUR frame is sent, and the Wi-Fi interface of STA3 is on, but the interface corresponding to the WUR module of STA3 (that is, the WUR interface) is closed, and STA3 cannot obtain the WUR frame sent by the AP. In the above two scenarios, the WUR frame is not fully utilized, which causes waste of energy and waste of air interface resources.
  • the embodiments of the present invention relate to a method and a device for transmitting and receiving a WUR frame, so as to solve the problem that the WUR frame in the prior art is not fully utilized.
  • an embodiment of the present invention provides a method for receiving a WUR frame, where the method for receiving a WUR frame includes: receiving, by a device, a first part of a frame by a primary communication module (such as a Wi-Fi interface) of the device, where the first part Included in the L-SIG domain and at least one OFDM symbol located after the L-SIG domain, the information carried by the at least one OFDM symbol includes: indication information indicating whether the frame is a WUR frame; if at least one OFDM symbol indicates that the frame is WUR a frame, the device determining, according to information carried by the at least one OFDM symbol, whether to continue receiving the second portion of the frame by the primary communication module of the device, or to stop receiving the frame, the second portion of the frame being located after the first portion.
  • a primary communication module such as a Wi-Fi interface
  • At least one OFDM symbol after receiving the L-SIG domain, at least one OFDM symbol, if the information carried by the at least one OFDM symbol indicates that the frame is a WUR frame, continues to receive the second part of the frame, or stops receiving the frame.
  • the L-SIG domain includes an L-LENGTH field, and in the case where the frame is a WUR frame, the L-LENGTH field is used to indicate the frame type of the WUR frame.
  • the device determines, according to at least information carried by the at least one OFDM symbol, whether to continue receiving the second part of the frame by using the primary communication module of the device, including: If at least one OFDM symbol indicates that the frame is a WUR frame, and the frame type of the WUR frame indicated by the L-LENGTH field conforms to the requirements of the device, the device continues to receive the second portion of the frame through the primary communication module of the device.
  • the device determines, according to at least information carried by the at least one OFDM symbol, whether to continue receiving the second part of the frame by using the primary communication module of the device, including: If at least one OFDM symbol indicates that the frame is a WUR frame, and the frame type of the WUR frame indicated by the L-LENGTH field does not meet the requirements of the device, the receiving of the frame is stopped.
  • the at least one OFDM symbol is part of a wake-up preamble
  • the location of the wake-up preamble in the frame is located after the L-SIG field of the frame
  • the second part of the frame includes wake-up The content following at least one OFDM symbol in the preamble, and thus the length of the physical frame header of the frame, is not increased.
  • At least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wake-up preamble in the frame, and the symbol may be on-off keying (On- Off Keying, OOK) symbol or OFDM symbol.
  • At least one OFDM symbol is added between the L-SIG domain and the "Wake-up Preamble", and the second portion of the frame includes a wake-up preamble, which simplifies the operation of identifying the WUR frame.
  • the information carried by the at least one OFDM symbol further includes at least one of the following information.
  • the information carried by the at least one OFDM symbol further includes: indication information of the frame type, used to indicate a frame type of the WUR frame.
  • the frame type of the WUR frame is one of the following: a wake-up frame sent by the AP to the STA, a wake-up radio beacon frame sent by the AP to the STA, or a wake-up frame sent by the STA to the AP.
  • the information carried by the at least one OFDM symbol further includes: identifier information of a primary communication interface of the target receiver of the frame, or identifier information of the auxiliary wake-up interface of the target receiver of the frame.
  • the first portion of the frame is a legacy 802.11 preamble and the second portion of the frame is part or all of the WUR payload.
  • an embodiment of the present invention provides a method for transmitting a WUR frame, where the method for transmitting a WUR frame includes: the device generates a frame, where the frame includes a first part and a second part, and the second part of the frame is located in the After the portion, the first part includes an L-SIG domain and at least one OFDM symbol located after the L-SIG domain, and the information carried by the at least one OFDM symbol includes: indication information indicating whether the frame is a WUR frame; and the frame is sent.
  • the frame is indicated as a WUR frame by using at least one OFDM symbol after the L-SIG field in the frame.
  • the L-LENGTH field is included by the L-SIG domain, and the L-LENGTH field is used to indicate the frame type of the WUR frame.
  • the at least one OFDM symbol is part of a wake-up preamble
  • the position of the wake-up preamble in the frame is located after the L-SIG field in the frame
  • the second part of the frame includes at least one OFDM in the wake-up preamble
  • the content after the symbol also does not increase the length of the physical frame header of the frame.
  • At least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wakeup preamble in the frame, and the symbol may be an OOK symbol or an OFDM symbol.
  • At least one OFDM symbol is added between the L-SIG domain and the "Wake-up Preamble", and the second portion of the frame includes a wake-up preamble, which simplifies the operation of identifying the WUR frame.
  • the information carried by the at least one OFDM symbol further includes at least one of the following: a result of the exclusive OR of the content of the L-SIG and a known bit sequence, a modulation and coding manner of the frame, or The length of the frame.
  • the information carried by the at least one OFDM symbol further includes indication information of a frame type, which is used to indicate a frame type of the WUR frame.
  • the frame type of the WUR frame is one of the following: a wake-up frame sent by the AP to the STA, a wake-up radio beacon frame sent by the AP to the STA, or a wake-up frame sent by the STA to the AP.
  • the information carried by the at least one OFDM symbol further includes identification information of a primary communication interface of the target recipient of the frame, or identification information of the auxiliary wake-up interface of the target recipient of the frame.
  • the first portion of the frame is a legacy 802.11 preamble and the second portion of the frame is part or all of the WUR payload.
  • an embodiment of the present invention provides a device, where the device includes: a main communication module, configured to receive a a first portion of the frame, the first portion includes an L-SIG domain and at least one OFDM symbol located after the L-SIG domain; the information carried by the at least one OFDM symbol includes: indication information indicating whether the frame is a WUR frame; And determining, by the at least one OFDM symbol, whether the frame is a WUR frame; the primary communication module is further configured to: determine, according to information carried by the at least one OFDM symbol, whether to pass the primary communication, if the processing module determines that the frame is a WUR frame The module continues to receive the second portion of the frame or stops receiving the frame, the second portion of the frame being located after the first portion.
  • the processing module determines that the frame is a WUR frame according to the first part of the frame, and the main communication module continues to receive the second part after the first part of the frame, or stops receiving the frame.
  • the processing module is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, and if it is determined that the frame is a WUR frame, determine whether to pass the main communication module according to at least information carried by the at least one symbol.
  • the processing module determines to continue receiving the second portion of the frame by the primary communication module.
  • the processing module is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, and if it is determined that the frame is a WUR frame, determine whether to pass the primary communication according to at least information carried by the at least one OFDM symbol.
  • the module continues to receive the second portion of the frame comprising: if at least one OFDM symbol indicates that the frame is a WUR frame, and the L-LENGTH field indicates that the frame type of the WUR frame does not meet the requirements of the device, then the processing module continues to receive the frame.
  • the device stops receiving the frame by using a primary communication module of the device, including: if at least one OFDM symbol indicates that the frame is a WUR frame, according to the device Demand information, stop receiving the frame.
  • the at least one OFDM symbol is part of a wake-up preamble
  • the position of the wake-up preamble in the frame is located after the L-SIG field in the frame
  • the second part of the frame includes at least one OFDM in the wake-up preamble
  • the content after the symbol also does not increase the length of the physical frame header of the frame.
  • At least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wakeup preamble in the frame, and the symbol may be an OOK symbol or may be an OFDM symbol. .
  • At least one OFDM symbol is added between the L-SIG domain and the "Wake-up Preamble", and the second portion of the frame includes a wake-up preamble, which simplifies the operation of identifying the WUR frame.
  • the information carried by the at least one OFDM symbol further includes at least one of the following: a result of the exclusive OR of the content of the L-SIG and a known bit sequence, a modulation and coding manner of the frame, or The length of the frame.
  • the information carried by the at least one OFDM symbol further includes indication information of a frame type, which is used to indicate a frame type of the WUR frame.
  • the frame type of the WUR frame is one of the following: a wake-up frame sent by the AP to the STA, a wake-up radio beacon frame sent by the AP to the STA, or a wake-up frame sent by the STA to the AP.
  • the information carried by the at least one OFDM symbol further includes: identifier information of a primary communication interface of the target receiver of the frame, or identifier information of the auxiliary wake-up interface of the target receiver of the frame.
  • the first portion of the frame is a legacy 802.11 preamble and the second portion of the frame is all or part of the WUR payload.
  • an embodiment of the present invention provides an apparatus, where the apparatus includes: a processing module, configured to generate a frame, where the frame includes a first part and a second part, and the second part of the frame is located after the first part, The part includes an L-SIG domain and at least one OFDM symbol located after the L-SIG domain, and the information carried by the at least one OFDM symbol includes: indication information indicating whether the frame is a WUR frame; and a sending module, configured to send the frame.
  • the frame type of the WUR frame may be indicated by including the L-LENGTH field through the L-SIG domain.
  • the at least one OFDM symbol is part of a wakeup preamble
  • the location of the wakeup preamble in the frame is located after the L-SIG domain in the frame
  • the second part of the frame includes at least a wakeup preamble
  • the content after one OFDM symbol does not increase the length of the physical frame header of the frame.
  • the at least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wakeup preamble in the frame, and the symbol may be an OOK symbol or an OFDM symbol. .
  • At least one OFDM symbol is added between the L-SIG domain and the "Wake-up Preamble", and the second portion of the frame includes a wake-up preamble, which simplifies the operation of identifying the WUR frame.
  • the information carried by the at least one OFDM symbol further includes at least one of the following: a result of the exclusive OR of the content of the L-SIG and a known bit sequence, and a modulation and coding manner of the frame. , or the length of the frame.
  • the information carried by the at least one OFDM symbol further includes indication information of a frame type, and is used to indicate a frame type of the WUR frame.
  • the frame type of the WUR frame is one of: a wake-up frame sent by the AP to the STA, a wake-up radio beacon frame sent by the AP to the STA, or a wake-up frame sent by the STA to the AP.
  • the information carried by the at least one OFDM symbol further includes identification information of a primary communication interface of a target receiver of the frame, or identification information of an auxiliary wake-up interface of a target receiver of the frame.
  • the first portion of the frame is a legacy 802.11 preamble and the second portion of the frame is part or all of the WUR payload.
  • an embodiment of the present invention provides a WUR frame, where the WUR frame includes: a first part and a second part located after the first part, where the first part includes an L-SIG domain and is located in the L-SIG domain
  • the following at least one OFDM symbol, the information carried by the at least one OFDM symbol includes: indication information indicating that the frame is a WUR frame.
  • the WUR frame having the above structure provided by the embodiment of the present invention can enable the receiver's main communication module (such as a Wi-Fi interface) to identify the WUR frame, so that the receiver that does not have the WUR interface or the WUR interface in the sleep state can
  • the WUR frame is identified by using the main communication module that the receiver has, and then the remaining portion of the WUR frame can be selected according to requirements, so that the WUR frame is more utilized.
  • the L-SIG domain includes an L-LENGTH field, and in the case where the frame is a WUR frame, the L-LENGTH field is used to indicate the frame type of the WUR frame. After determining that the received frame is a WUR frame, the frame type of the WUR frame may be indicated by the L-LENGTH field.
  • the at least one OFDM symbol is located in a wake-up preamble in the frame
  • the location of the wake-up preamble in the frame is located after the L-SIG field in the frame
  • the second part of the frame includes wake-up At least one of the preambles The content after the OFDM symbol. Therefore, the length of the physical frame header of the frame is not increased.
  • the at least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wake-up preamble in the frame.
  • the at least one OFDM symbol is located between an L-SIG domain and a wake-up preamble of the frame, and the second portion of the frame includes a wake-up preamble.
  • the information carried by the at least one OFDM symbol further includes at least one of the following: a result of the exclusive OR of the content of the L-SIG and a known bit sequence, a modulation sum of the frame The encoding method, or the length of the frame.
  • the information carried by the at least one OFDM symbol when the at least one OFDM symbol indicates that the frame is a WUR frame, the information carried by the at least one OFDM symbol further includes indication information of a frame type, which is used to indicate a frame type of the WUR frame. After determining that the frame is a WUR frame, the frame type of the WUR frame may also be indicated by the at least one OFDM symbol.
  • the frame type of the WUR frame is one of: a wake-up frame sent by the AP to the STA, a wake-up radio beacon frame sent by the AP to the STA, or a wake-up frame sent by the STA to the AP.
  • the information carried by the at least one OFDM symbol further includes: identifier information of a primary communication interface of the target receiver of the frame, or identifier information of the auxiliary wake-up interface of the target receiver of the frame.
  • the first portion of the frame includes a legacy 802.11 preamble
  • the second portion of the frame includes some or all of the WUR payload.
  • the present invention also provides a plurality of method embodiments and apparatus embodiments, including the following embodiments of the sixth aspect to the twelfth aspect:
  • an embodiment of the present invention provides a method for receiving a wake-up frame, where the method for receiving a wake-up frame includes: the STA receives a part of a frame through a Wi-Fi interface (802.11 interface) of the STA, and a part of the frame includes : at least one OFDM symbol after the L-SIG domain and the L-SIG domain, wherein the L_LENGTH field is included in the L-SIG domain; the STA is based on L_LENGTH of the L-SIG domain of the frame, and at least one after the L-SIG domain
  • the OFDM symbol identifies that the frame is a WUR frame and a type of WUR frame, and determines whether to continue receiving the WUR frame based on at least the type of the WUR frame.
  • the L-SIG domain received by the STA's Wi-Fi interface (802.11 interface) and the L-SIG domain are followed by at least one OFDM symbol, and the frame is identified as a WUR frame and a WUR frame type, and the STA is Wi- The Fi interface (802.11 interface) determines whether to receive a WUR frame according to the type of the WUR frame.
  • the type of the WUR frame is a WUR Beacon frame sent by the AP, and the WUR frame carries AP related information and time synchronization information, where the first value is 1 or 2 .
  • the type of the WUR frame is an AP-WUR wake-up frame sent by the STA, and the AP-WUR wake-up frame is used to wake up the 802.11 module of the AP, where the first value It is 1 or 2.
  • the type of the WUR frame is a STA-WUR wake-up frame sent by the AP, and the STA-WUR wake-up frame is used to wake up the 802.11 module of the STA, where the second value It is 1 or 2.
  • the STA if L_LENGTH satisfies L_LENGTH mod 3 ⁇ 0, the STA continues to receive N OFDM symbols after the L-SIG field of the frame; if L_LENGTH does not satisfy L_LENGTH mod 3 ⁇ 0, the STA stops receiving the Frame; where N is 1, 2, 3, or the length of the Wake-up Preamble.
  • an embodiment of the present invention provides a device, including: a memory, a processor, a first interface, and a second interface; the memory is configured to store an instruction; the processor is configured to invoke an instruction stored in the memory, A method of receiving a wake-up frame is performed through the first interface and the second interface.
  • the first interface is a Wi-Fi interface.
  • the second interface is an auxiliary wake-up interface.
  • an embodiment of the present invention provides a method for sending a wake-up frame, where the method for sending a wake-up frame includes: an AP generating a WUR frame, where the WUR frame includes at least one OFDM after the L-SIG domain and the L-SIG domain
  • the L-SIG domain includes at least one L_LENGTH field, and at least one OFDM symbol after the L_LENGTH field and/or the L-SIG field is used to indicate that one frame is a WUR frame and a type of WUR frame; the AP transmits a WUR frame to at least one STA.
  • the L_LENGTH field in the L-SIG field in one frame and the at least one OFDM symbol after the L-SIG field indicate that the frame is a WUR frame and a frame type of the WUR frame.
  • the WUR frame is a WUR Beacon frame sent by the AP, and the WUR frame carries AP related information and time synchronization information, etc., wherein the first value is 1 or 2.
  • the WUR frame is a STA-WUR wake-up frame sent by the AP, and the WUR frame is an 802.11 module used to wake up the STA, where the second value is 1 or 2, The second value is different from the first value.
  • an embodiment of the present invention provides a device, including: a memory, a processor, a first interface, and a second interface; the memory is configured to store an instruction; the processor is configured to invoke an instruction stored by the memory, A method of transmitting a wake-up frame is performed through the first interface and the second interface.
  • the first interface is a Wi-Fi interface.
  • the second interface is an auxiliary wake-up interface.
  • an embodiment of the present invention provides a method for receiving a wake-up frame, where the method for receiving a wake-up frame includes: an AP generating a WUR frame, where the WUR frame includes at least one OFDM after the L-SIG domain and the L-SIG domain a symbol, the L-SIG domain includes at least an L_LENGTH field, and at least one OFDM symbol after the L_LENGTH field and/or the L-SIG domain may be used to indicate that one frame is a WUR frame and a type of a WUR frame; the AP transmits a WUR frame to at least one STA; At least one STA receives a WUR frame through a Wi-Fi interface (802.11 interface); at least one STA identifies that the frame is a WUR frame and a WUR frame type according to at least one OFDM symbol after the L_LENGTH and/or L-SIG domain of the frame, and Determine whether to continue receiving WUR frames according to their own needs and the type
  • the AP uses the L_LENGTH field in the L-SIG domain and the at least one OFDM symbol after the L-SIG field to indicate that the frame is a WUR frame and a WUR frame type. If the STA's Wi-Fi interface receives the frame, The L_LENGTH of the frame and/or at least one OFDM symbol after the L-SIG domain identifies that the frame is a WUR frame and a type of WUR frame, and the STA may decide whether to continue receiving the WUR frame according to its own requirements and the type of the WUR frame.
  • the WUR frame is a WUR Beacon frame sent by the AP, and the WUR frame carries AP related information and time synchronization information, etc., wherein the first value is 1 or 2.
  • the WUR frame is a STA-WUR wake-up frame sent by the AP, and the WUR frame is an 802.11 module used to wake up the STA, where the second value is 1 or 2, The second value is different from the first value.
  • L_LENGTH satisfies L_LENGTH mod 3 ⁇ 0, at least one STA continues to receive N OFDM symbols after the L-SIG domain; if L_LENGTH does not satisfy L_LENGTH mod3 ⁇ 0, at least one STA stops receiving the Frame; where N is 1, 2, 3, or the length of the Wake-up Preamble.
  • At least one OFDM symbol after the L-SIG domain carries one or more of the following information: the target of the WUR frame receives the identification information of the STA's main communication interface (such as a Wi-Fi interface), The target of the WUR frame receives the identification information of the STA's auxiliary wake-up interface (such as the WUR interface), and the sender information of the WUR frame.
  • the target of the WUR frame receives the identification information of the STA's main communication interface (such as a Wi-Fi interface)
  • the target of the WUR frame receives the identification information of the STA's auxiliary wake-up interface (such as the WUR interface), and the sender information of the WUR frame.
  • the at least one OFDM symbol after the L-SIG domain further carries one or more of the following information: WUR frame indication information, information related to a basic service set in which the sender of the WUR frame is located .
  • an embodiment of the present invention provides a method for transmitting a WUR frame, where the method for transmitting a WUR frame includes: the AP generates a WUR frame, and the WUR frame includes at least one of an L-SIG domain and an L-SIG domain.
  • the L-SIG domain includes at least an L_LENGTH field, and at least one OFDM symbol after the L_LENGTH field and/or the L-SIG field is used to indicate that one frame is a WUR frame; at least one OFDM symbol following the L-SIG domain carries a WUR frame
  • the frame is a WUR frame by using at least one OFDM symbol after the L_LENGTH field and the L-SIG field in the L-SIG field in the frame.
  • the at least one OFDM symbol after the L-SIG domain further carries one or more of the following information: identification information of an auxiliary wake-up interface (such as a WUR interface) of the target receiver STA of the WUR frame, And sender information for WUR frames.
  • identification information of an auxiliary wake-up interface such as a WUR interface
  • the at least one OFDM symbol after the L-SIG domain further carries one or more of the following information: WUR frame indication information, WUR frame type information, and the basic of the sender of the WUR frame.
  • Information about the service set is not limited to, but not limited
  • an embodiment of the present invention provides a method for receiving a WUR frame, where the method for receiving a WUR frame includes: the STA receives a part of a frame by using a Wi-Fi interface (802.11 interface) of the STA, and part of the frame
  • the method includes: at least one OFDM symbol after the L-SIG domain and the L-SIG domain, where the L-SIG domain includes an L_LENGTH field; the STA is based at least on the L_LENGTH of the frame and/or at least one OFDM symbol after the L-SIG domain Identifying that the frame is a WUR frame; the STA obtains identification information of a primary communication interface (such as a Wi-Fi interface) of the target receiving STA of the WUR frame according to at least one L_LENGTH of the WUR frame and/or at least one OFDM symbol after the L-SIG field; STA Whether to continue receiving the WUR frame depends at least on the type of the WUR frame.
  • a primary communication interface such as
  • the L_LENGTH field in the L-SIG domain and the at least one OFDM symbol after the L-SIG domain in the frame received by the Wi-Fi interface of the STA identify that the frame is a WUR frame, and according to L_LENGTH and/or
  • the identification information of the Wi-Fi connection of the target receiving STA of the WUR frame is obtained by at least one OFDM symbol after the L-SIG domain.
  • the STA may also decide to continue receiving WUR frames according to the type of WUR frame.
  • At least one OFDM symbol after the L-SIG domain carries one or more of the following information: the identification information of the auxiliary wake-up interface (such as the WUR interface) of the target receiving STA of the WUR frame, and WUR The sender information of the frame.
  • the at least one OFDM symbol after the L-SIG domain further carries one or more of the following information: WUR frame indication information, and related to a basic service set in which the sender of the WUR frame is located information.
  • the method and device for transmitting and receiving a WUR frame according to an embodiment of the present invention indicate whether the frame is a WUR frame according to at least one OFDM symbol after the L-SIG field in one frame.
  • the embodiments provided by the present invention can enable the Wi-Fi interface to recognize the WUR frame, thereby fully utilizing the WUR frame, improving the air interface efficiency and reducing the power consumption of the device.
  • FIG. 1 is a schematic diagram of receiving a WUR frame in the prior art
  • FIG. 2 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for transmitting and receiving a WUR frame according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a format of a WUR frame in the prior art
  • FIG. 5 is a flowchart of a method for transmitting and receiving a WUR frame according to an embodiment of the present invention
  • FIG. 6a is a schematic diagram of a WUR frame format according to an embodiment of the present invention.
  • FIG. 6b is a schematic diagram of another WUR frame format according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of another device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a device according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of another device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the communication system includes a first device 10 and a second device 20.
  • the number of the first device 10 or the second device 20 may be more than one, and FIG. 2 shows only one of them as an example.
  • the first device 10 transmits a message to the second device 20, and the second device 20 receives the message transmitted by the first device 10.
  • the second device 20 includes a first transceiver 201 and a second receiver 202, and the second device 20 can receive the Wi-Fi message transmitted by the first device 10 through the first transceiver 201.
  • the second device 20 After the second device 20 receives the WUR format wake-up frame sent by the first device 10 (the wake-up frame belongs to one of the WUR frames), the second device 20 wakes up in a sleep state (such as turning off).
  • the first transceiver 201 of the state receives the Wi-Fi message sent by the first device 10 to the second device 20 through the first transceiver 201.
  • the second device 20 may include a first transceiver 201, and the first transceiver 201 may Provided by the primary communication module, for example, by an 802.11 communication module, the first transceiver 201 can be used to send and receive messages including, but not limited to, Wi-Fi messages and WUR frames.
  • the second device 20 further includes a second receiver 202, which may be provided by an auxiliary wake-up module (such as WUR), which may be used to receive the first device 10
  • WUR auxiliary wake-up module
  • the WUR format wake-up frame and after receiving the wake-up frame, sends a wake-up signal to the first transceiver 201 to wake up the first transceiver 201, and receives the Wi-Fi message sent by the subsequent first device 10 through the first transceiver 201.
  • first device 10 and the second device 20 may be replaced.
  • first device 10 sends a message to the second device 20 as an example for description.
  • the frame type of the WUR frame may include multiple types, that is, there may be multiple types of WUR frames, and the frame types of the WUR frame may include the following (see Table 1):
  • the first type the WUR Beacon frame sent by the AP, that is, the WUR Beacon frame broadcast by the AP, can carry AP related information and/or time synchronization information.
  • the second type: the STA-WUR wake-up frame sent by the AP, that is, the wake-up frame of the WUR sent by the AP to the STA, may be that the WUR wake-up frame is simultaneously sent to multiple STAs by the OFDMA method.
  • the third type is the AP-WUR wake-up frame sent by the STA, that is, the wake-up frame of the WUR sent by the STA to the AP.
  • FIG. 3 is a flowchart of a method for transmitting and receiving a WUR frame according to an embodiment of the present invention. As shown in FIG. 3, the method for transmitting and receiving a WUR frame may include the following steps:
  • Step 301 The first device sends a frame to the second device, where the frame includes a first part and a second part, the second part of the frame is located after the first part, and the first part includes a traditional signal domain L-SIG domain (Legacy Signal a field, that is, a non-High-Throughput (non-HT) signal field, and at least one OFDM symbol located after the L-SIG field, the information carried by the at least one OFDM symbol includes: indicating whether the frame is Indicates the WUR frame. If the frame is a WUR frame, the information carried by the at least one OFDM symbol in the WUR frame includes: indication information indicating that the frame is a WUR frame.
  • L-SIG domain Legacy Signal a field
  • non-HT non-High-Throughput
  • the first device employs a Wi-Fi transceiver (ie, a Wi-Fi interface that satisfies the Wi-Fi standard protocol) for receiving and transmitting WUR frames.
  • a Wi-Fi transceiver ie, a Wi-Fi interface that satisfies the Wi-Fi standard protocol
  • the first device may also use other types of transceivers (eg, WUR) to receive and transmit WUR frames, and details are not described herein.
  • the L-LENGTH domain in the L-SIG domain of the frame may be further passed. Indicates the specific frame type of the WUR frame, that is, which type of WUR frame the WUR frame is.
  • the at least one OFDM symbol is located in a wake-up preamble of the frame, as shown in Figure 6a, the at least one OFDM symbol 610 is located in a wake-up preamble of the frame.
  • the location of the wake-up preamble in the frame is located after the L-SIG field in the frame, and the second portion of the frame includes the content after waking up at least one OFDM symbol in the preamble.
  • the at least one OFDM symbol after the L-SIG domain may include that the at least one OFDM symbol may be immediately after the L-SIG domain (as shown in FIG. 6a, the at least one OFDM symbol 610 is located in the frame) Wake up in the preamble, immediately after the L-SIG domain); or, the at least one OFDM symbol is not next to each other
  • the L-SIG domain is followed by one or more symbols (each symbol may be an OOK symbol or an OFDM symbol) after the L-SIG domain.
  • the receiver of the frame may receive a short portion of the information of the frame (eg, in this case, only After receiving the traditional 802.11 preamble of the frame and at least one OFDM symbol immediately thereafter, the STA can identify whether the frame is a WUR frame, so that it can determine whether to continue receiving the rest of the frame according to its own needs, saving The power consumption of the STA.
  • the second portion includes content other than the at least one OFDM symbol in the wake-up preamble; if the at least one OFDM symbol is not next to The L-SIG domain, the second part does not include content before the at least one OFDM symbol and the at least one OFDM symbol in the wake-up preamble.
  • the at least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wake-up preamble in the frame, and the symbol may be an OOK symbol or an OFDM symbol.
  • At least one OFDM symbol is located between an L-SIG domain and a wake-up preamble of the frame, a second portion of the frame includes the wake-up preamble, and the location of the at least one OFDM symbol is existing
  • the positions of the fields of the WUR frame are non-overlapping and independent of each other, which facilitates and simplifies the operation of the receiver to recognize the WUR frame.
  • the information carried by the at least one OFDM symbol further comprises at least one of the following: a result of the exclusive OR of the content of the L-SIG field and a known bit sequence, and a modulation and coding manner of the frame, Or the length of the frame.
  • the information carried by the at least one OFDM symbol may further include indication information of a frame type, where the WUR frame is indicated.
  • the specific frame type indicates which type of WUR frame the WUR frame is.
  • the frame type of the WUR frame is one of the following: a wake-up frame sent by the AP to the STA or a wake-up radio beacon frame, and the STA sends the wake-up frame to the AP.
  • the information carried by the at least one OFDM symbol further includes identification information of a primary communication interface of the target recipient of the frame, or identification information of the auxiliary wake-up interface of the target recipient of the frame.
  • the first portion of the frame is a legacy 802.11 preamble and the second portion of the frame is part or all of the WUR payload.
  • Step 302 The second device receives the first part of the frame sent by the first device by using the primary communication module of the second device.
  • the second device may employ a Wi-Fi transceiver (ie, a Wi-Fi interface that satisfies the Wi-Fi standard protocol) to receive the frame (which may be a WUR frame).
  • a Wi-Fi interface is a Wi-Fi transceiver, and a Wi-Fi interface can be provided by the main communication module.
  • the main communication module is used to receive and send messages.
  • the first device is an Access Point (AP), and the second device is a Station (STA).
  • the number of APs or STAs may be more than one.
  • the AP sends a WUR frame to the STA device before the AP sends the data to the STA.
  • the first device is an STA
  • the second device is an AP
  • the number of APs or STAs may be more than one.
  • the AP transmits a WUR frame through a Wi-Fi interface or a WUR interface.
  • the WUR interface may be provided by the auxiliary wake-up module for receiving wake-up frames sent by other devices.
  • the at least one OFDM symbol is located after the L-SIG field in the frame, and the at least one OFDM symbol is used to indicate that the frame is a WUR frame.
  • the position of the at least one OFDM symbol in the frame may be one of the following three possible cases (1) to (3):
  • At least one OFDM symbol is N OFDM, 1 ⁇ N ⁇ M, the N OFDM symbols are the number of symbols included in the wake-up preamble, where M is the number of symbols included in the wake-up preamble in the frame .
  • the N OFDM symbols are used to indicate that the frame is a WUR frame.
  • the N OFDM symbols are a number of symbols that wake up the foremost front, such as 3 symbols.
  • the first portion includes the L-SIG domain in the frame
  • the L-SIG domain includes the L-LENGTH field
  • the L-LENGTH field is used to indicate the frame type of the frame.
  • the STA may further determine a frame type of the WUR frame by using an L-LENGTH field in the L-SIG field of the WUR frame, for example, the WUR frame may be adopted.
  • the L-LENGTH value of the L-SIG domain differs from the result of the 3-modulo to determine the specific frame type of the WUR frame.
  • the frame type of the WUR frame can be as shown in Table 1:
  • L-LENGTH mod 3 1 Wake-up frame (SU frame, SU-OFDM) sent by the STA to the WUR of the AP
  • L-LENGTH mod 3 2
  • the WUR wake-up frame sent by the AP to the STA may be a MU-OFDMA frame
  • the STA may determine, according to the address information of the receiver carried by the wake-up frame sent by the AP, whether to continue to receive by the STA's Wi-Fi transceiver. The second portion of the wake-up frame. For example, if the address information of the receiver carried by the wake-up frame matches the related address information of the STA, the STA determines to continue receiving the second part of the wake-up frame.
  • the STA may determine, according to its own needs, whether to continue receiving the second part of the WUR frame by the STA's Wi-Fi transceiver. For example, according to the indication rule of the frame type enumerated in Table 1, the STA may determine to continue receiving the second part of the WUR frame according to its own needs, which may include one or more of the following:
  • the unassociated STA receives the WUR Beacon frame sent by the AP.
  • the second case the associated STA receives the WUR Beacon frame sent by the AP.
  • the third case the associated STA string listens to the wake-up frame of the WUR sent by other STAs to the AP.
  • one or more OFDM symbols are added between the L-SIG domain and the wake-up preamble, which may be referred to as a WUR SIG (W-SIG) field, and the W-SIG field is used to indicate The frame is a WUR frame. Further, the specific frame type of the WUR frame may be indicated by a W-SIG field.
  • W-SIG WUR SIG
  • the STA may determine whether the frame is a WUR frame according to one or more OFDM symbols after the L-SIG field in the process of receiving one frame.
  • the STA receives a frame through the STA's Wi-Fi receiver, for example, after receiving the first part of the frame by the STA's Wi-Fi receiver, at the STA If it is found that one or more OFDM symbols after the L-SIG field of the frame is a W-SIG domain, the STA may determine that the frame is a WUR frame, and the STA may continue to receive the frame through the STA's Wi-Fi receiver. The second part, or the STA can also stop receiving the frame.
  • the STA may determine that the frame is not a WUR frame, and the STA may treat the frame according to the case that the frame is another frame.
  • At least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wake-up wake-up preamble, and the symbol may be an OOK symbol or an OFDM symbol.
  • N OFDM symbols are used to indicate whether the frame is a WUR frame.
  • the Wi-Fi receiver may determine, according to the N OFDM symbols after the L-SIG domain, whether the frame is a WUR frame (eg, a Wi-Fi receiver may include a microprocessor)
  • a DSP Digital Signal Processor
  • the microprocessor determines whether the frame is a WUR frame according to N OFDM symbols after the L-SIG domain, and the value of N may be included in the wake-up preamble.
  • the number of symbols M, or N may be less than M.
  • it may be a processor other than the Wi-Fi receiver in the STA (such as 1030 in FIG. 10) to determine whether the frame is a WUR frame according to N OFDM symbols after the L-SIG domain. .
  • Step 303 If the at least one OFDM symbol indicates that the frame is a WUR frame, the second device determines, according to the information carried by the at least one OFDM symbol, whether to continue to receive the frame by the primary communication module of the second device. In the second part, the second part of the frame is located after the first part.
  • the second device continues to receive the second part of the frame by using the primary communication module of the second device, including: if the at least one OFDM symbol indicates that the frame is A WUR frame, and the type of the frame is a frame type of the WUR frame, and the second device continues to receive the second portion of the frame through the primary communication module of the second device.
  • the second device determines, according to the information carried by the at least one OFDM symbol, whether to continue receiving the frame by using the primary communication module of the second device.
  • the second part includes: if the at least one OFDM symbol indicates that the frame is a WUR frame, and the frame type of the WUR frame indicated by the L-LENGTH field meets a requirement of the device, the device communicates through the device The module continues to receive the second portion of the frame.
  • the second device determines, according to at least information carried by the at least one OFDM symbol, whether to continue receiving the frame by using a primary communication module of the device.
  • the second part includes: if the at least one OFDM symbol indicates that the frame is a WUR frame, and the frame type of the WUR frame indicated by the L-LENGTH field does not meet the requirements of the device, the device stops receiving the frame.
  • the requirements of the device may be determined by specific operations inside the second device. For example, after receiving the first part of the frame, the second device determines that the frame is a WUR frame, but since the second device operation is overloaded, the second device stops receiving the frame.
  • the embodiment of the invention can enable the Wi-Fi interface to identify whether a frame is a WUR frame, so that the WUR frame can be fully utilized, the air interface efficiency is improved, and the energy consumption of the second device is reduced.
  • FIG. 4 shows a possible frame format for an existing WUR frame.
  • an existing Wi-Fi receiver such as an 802.11ax receiver
  • receives a WUR frame as shown in FIG. 4 the Wi-Fi receiving opportunity recognizes that the frame is an 802.11 frame according to a legacy 802.11 preamble (Legacy 802.11 Preamble). And complete operations such as AGC setting and symbol synchronization according to the traditional 802.11 preamble.
  • the Wi-Fi receiving device further determines, according to one or more OFDM symbols after the L-SIG field in the legacy 802.11 preamble, which of the following frames the frame belongs to: 802.11a frame, 802.11n frame, 802.11ac Frame, or 802.11ax frame.
  • the existing Wi-Fi receiver cannot correctly judge the frame.
  • the type (802.11a frame, 802.11n frame, 802.11ac frame, or 802.11ax frame) the existing Wi-Fi receiver will receive and process the frame as an 802.11a frame.
  • the Wi-Fi receiver receives and processes the frame in accordance with the frame format of 802.11a, and an error occurs when performing frame check on the frame (i.e., the frame is considered to have an error during transmission), and then the frame is discarded.
  • the Wi-Fi receiver parses a conventional WUR frame, there is no way to identify that the frame is a WUR frame, and the frame is received and processed as an 802.11a frame, and then the An error occurs in the frame for frame check, and the frame is finally discarded, so that the conventional WUR frame is not fully utilized, and the energy consumption of the receiver's Wi-Fi receiver is wasted.
  • the embodiments provided by the present invention provide a technical solution for enabling a Wi-Fi receiver to identify a WUR frame, for example, one or more OFDMs may be added between an L-SIG domain in the legacy 802.11 preamble and the wake-up preamble.
  • a symbol to indicate that the frame is a WUR frame to help the Wi-Fi receiver identify the frame as a WUR frame, enabling the Wi-Fi receiver to correctly receive and process the WUR frame; or, identifying a W-Fi receiver at the Wi-Fi receiver
  • the operation of the kind of frame increases the operation of the Wi-Fi receiver to recognize whether a frame is a WUR frame.
  • the Wi-Fi receiver can determine, in receiving a frame, which of the following frames the received frame belongs to: WUR frame, 802.11a frame, 802.11n frame, 802.11ac frame, or 802.11ax frame. After the receiver's Wi-Fi receiver correctly recognizes a frame as a WUR frame, it can select whether to receive the remaining portion of the WUR frame according to the needs of the receiver, so that the WUR frame is more utilized.
  • the at least one OFDM symbol after the L-SIG domain is a part of the wake-up preamble, and the location of the wake-up preamble is located after the L-SIG field in the frame, where the frame is The second part includes waking up the content after at least one OFDM symbol in the preamble.
  • N (1 ⁇ N ⁇ 3) OFDM symbols after the L-SIG domain are the first N symbols of the wake-up preamble.
  • the STA may modulo 3 by the value of L-LENGTH of the L-SIG domain, reducing the processing of extraneous frames.
  • the frame when the L_LENGTH in the L-SIG field of the frame received by the Wi-Fi receiver satisfies the condition shown in Table 1, the frame may be: (1) 802.11a frame, ( 2) 802.11ax frame, or (3) WUR frame; not 802.11n or 802.11ac frame (because for Wi-Fi frames conforming to 802.11n or 802.11ac standards, the Wi-Fi frame of L-LENGTH
  • the result of the value modulo 3 can only be "0", which is impossible to satisfy.
  • the value of L-LENGTH in the L-SIG field of the 802.11a frame has three results for modulo 3, "0", "1", or "2".
  • the value of L-LENGTH in the L-SIG field of the 802.11n and 802.11ac frames is "0" for the modulo result.
  • the value of L-LENGTH in the L-SIG field of an 802.11ax frame has two possible outcomes for modulo 3: "1" or "2".
  • the frame eg, 802.11a, 802.11n, or 802.11ac.
  • the at least one OFDM symbol is N OFDM, 1 ⁇ N ⁇ 3, and the N OFDM symbols are part of the wake-up preamble. N OFDM symbols are used to indicate that the frame is a WUR frame.
  • the Wi-Fi receiver determines, according to the N OFDMs after the L-SIG domain, that the received frame is a WUR frame, including:
  • the first step the Wi-Fi receiver parses the symbol X1 according to the decoding rule.
  • the decoding rule may be “802.11ax PHY RL-SIG”, and the decoding result is a bit sequence, the bit length of the bit sequence is 24, and the bit sequence is calculated. Different from the L-SIG content, for example, the Hamming Distance of the two can be calculated, and the difference between the bit sequence and the L-SIG content is calculated as D1.
  • the Wi-Fi receiver parses two symbols (X2, X3) according to the decoding rule, and the decoding rule may be “802.11ax PHY HE-SIG-A”, and the decoding result is a bit sequence, and the bit sequence is obtained.
  • the character length is 52.
  • CRC Cyclic Redundancy Check
  • Step 2 The Wi-Fi receiver parses the symbol (X1, X2) according to the decoding rule, and the decoding rule may be “802.11a MAC Service Field”, and the decoding result is a bit sequence, and the bit length of the bit sequence is 16, and The difference between the bit sequence and the content of the "802.11a MAC Service Field" is calculated. For example, the Hamming Distance of the bit sequence and the "802.11a MAC Service Field" content can be calculated, and the difference between the two is recorded as D3.
  • the order in which the Wi-Fi receiver performs the first step and the second step is not fixed, and the second step may be performed first, then the first step may be performed, or the first step and the second step may be performed simultaneously.
  • the order in which 802.11ax performs the first and second steps is not limited here.
  • the frame may also be a wake-up frame of the WUR sent by the STA to the AP.
  • the Wi-Fi receiver parses (X1, X2, X3) according to the decoding rule, and the decoding rule may be a Wake-up Preamble, obtain a decoding result bit sequence, the bit length of the bit sequence is 3, and calculate the bit sequence with "Wake- The difference of the first 3 bits of up Preamble, for example, the Hamming Distance of both can be calculated, and the difference is calculated as D4.
  • the fourth step is executed, the WUR frame is processed; or the WUR frame is stopped.
  • the Wi-Fi receiver can stop receiving and processing the frame, set the Network Allocation Vector (NAV), start the backoff, and the backoff time can be the time indicated by L-LENGTH, for example, ((8*) (2 ⁇ L-LENGTH)) / R) seconds, where, for 802.11n, 802.11ac, 802.11ax, R is 6 Mbps, and for 802.11a, R is the value specified by the MCS index in the L-SIG domain, for example, 11Mbps.
  • L-LENGTH for example, ((8*) (2 ⁇ L-LENGTH)) / R) seconds
  • the frame may be a wake-up frame of the WUR sent by an AP to the STA.
  • the AP may simultaneously send a wake-up frame to the WURs of multiple STAs by the OFDMA method, and the Wi-Fi receiver processes (X1, X2, X3) according to the modulation and coding methods of the OFDMA method and the “Wake-up Preamble”, for example,
  • the Wi-Fi receiver only processes information on the OFDM subcarriers associated with its own WUR.
  • the 802.11ax receiver obtains a (X1, X2, X3) decoding result bit sequence, the bit length of the bit sequence is 3, and calculates the difference between the bit sequence and the first 3 bits of the "Wake-up Preamble", for example, two can be calculated.
  • the Hamming distance of the person is calculated to be D5.
  • the Wi-Fi receiver can stop receiving and processing the frame, set the NAV, and start the backoff.
  • the backoff time can be the time indicated by L-LENGTH, for example, ((8*(2 ⁇ L-LENGTH))/ R) seconds, where R is 6 Mbps for 802.11n, 802.11ac, 802.11ax, and R is the value specified for the MCS index in the L-SIG domain for 802.11a, for example, 11 Mbps.
  • the order in which the Wi-Fi receiver performs the first step, the second step, and the third step is not fixed, and the third step may be performed first, and then the second step or the first step may be performed; or, the first Steps, second and third steps are performed simultaneously.
  • the order in which 802.11ax performs the first, second, and third steps is not limited here.
  • Step 4 Determine that the received frame (actually, only a part of the frame is received) is a WUR frame, and the Wi-Fi receiver continues to receive the frame (continues to receive the Payload portion of the WUR frame) and uses the frame as WUR Frame to handle.
  • the N OFDM symbols after the L-SIG domain may be one, two, or three.
  • the foregoing description is only a process of determining that the frame is a WUR frame for three OFDM symbols.
  • the 3 OFDM symbols, the 2 OFDM symbols, or the 1 OFDM symbol are all based on the OFDM symbol indication after the L-SIG domain to determine that the frame is a WUR frame.
  • the frame type of the WUR frame may be indicated according to the L-LENGTH field in the L-SIG domain. Therefore, one OFDM symbol or two OFDM symbols are not separately discussed here.
  • the Wi-Fi receiver passes the L-LENGTH field of the L-SIG domain and the 3 OFDM symbols after the "Legacy 802.11 Preamble" in the "Legacy 802.11 Preamble” of the WUR frame in the prior art. To determine that the frame is a WUR frame. In the embodiment of the present invention, the length of the "Legacy 802.11 Preamble" of the WUR frame is not increased, but the Wi-Fi receiver needs to judge by exhaustively whether the frame is a WUR frame. Further, the Wi-Fi receiver can identify the frame type of the WUR frame through the L_LENGTH field of the L-SIG domain.
  • the at least one OFDM symbol is between the L-SIG domain and the wake-up preamble, as shown in FIG. 6b.
  • one or more domains are newly added between a "Legacy 802.11 Preamble" (ie, a legacy 802.11 preamble) and a "Wake-up Preamble” (ie, a wake-up preamble) in a conventional WUR frame.
  • the one or more domains may be referred to as WUR SIG (W-SIG) domains, or other titles may be used.
  • W-SIG domain may be one domain or may include multiple domains, and the W-SIG domain may be composed of one or more OFDM symbols.
  • the W-SIG field can be used to indicate whether the frame is a WUR frame, as shown in Figure 6b.
  • the information carried by the W-SIG domain includes: indication information indicating whether the frame is a WUR frame, and further information may further include other information.
  • the W-SIG domain may be a specific domain, and the domain itself may be used to indicate that the frame is a WUR frame, that is, if the W-SIG domain exists in the frame, Then the existence of the domain can indicate that the frame is a WUR frame.
  • the frame when the value of some or all of the bits in the W-SIG domain in the frame is a certain predetermined value, the frame may be indicated as a WUR frame.
  • the Wi-Fi receiver may receive one frame according to one or N (where N is a positive integer, N is greater than or equal to 2) OFDM symbols after the L-SIG domain (here will be described)
  • N is a positive integer, N is greater than or equal to 2
  • OFDM symbols X4 One or N OFDM symbols are referred to as symbols X4), and it is determined whether the frame is a WUR frame. If the symbol X4 is the W-SIG field, it is determined that the frame is WUR; if the symbol X4 is not the W-SIG field, the Wi-Fi receiver can process the frame according to other frame types, and can also perform no processing on the received frame. There is no limit here.
  • XOR S exclusive OR
  • the content of the W-SIG field may also indicate the adjustment and encoding mode of the WUR frame, as well as the length of the WUR frame, and the like.
  • the modulation and coding scheme used by the 802.11ax transmitter to transmit the W-SIG can be the same as the modulation and coding used by the transmission L-SIG, which simplifies the reception of the W-SIG domain by the Wi-Fi receiver or other Wi-Fi receivers. Processing.
  • the content of the W-SIG may also be different or irrelevant to the content of the L-SIG.
  • the content carried by the W-SIG domain may include but is not limited to one or more of the following:
  • the content of the W-SIG domain includes WUR frame indication information
  • the Wi-Fi receiver can identify a WUR frame according to the WUR frame indication information, and continue to receive the sum when determining that the frame is a WUR frame. Processing WUR frames simplifies the operation of Wi-Fi receivers to identify WUR frames.
  • the WUR frame indication information is used to indicate that one frame is a WUR frame and may be 1 bit or multiple bits.
  • the content of the W-SIG domain includes WUR frame type information
  • the Wi-Fi receiver can determine, according to the WUR frame type information, whether the frame is an AP-WUR wake-up frame or a STA-WUR wake-up frame. Or one of the WUR Beacon frames, continue to receive and process WUR frames, to avoid the Wi-Fi interface receiving and processing frames that are not related to itself.
  • the WUR frame type information is used to indicate the type information of the WUR frame.
  • the WUR frame type information may be one or more bits, and the WUR frame type may be a wake-up frame or a broadcast WUR frame (such as a WUR Beacon).
  • the content of the W-SIG domain includes the identification information of the AP
  • the Wi-Fi receiver can determine, according to the identification information of the AP, whether the target receiver of the WUR frame belongs to the basic service set (Basic Service) Set, BSS), to facilitate the Wi-Fi receiver to filter the WUR frame that does not belong to the BSS where it is located, can avoid Wi-Fi free receivers receive and process unrelated frames.
  • the identification information of the AP includes, for example, a MAC address of the AP or a compressed MAC address, or a hash value of the MAC address of the AP, or a part of the MAC address of the AP.
  • the content of the W-SIG domain includes the identifier information of the BSS where the AP is located, and the Wi-Fi receiver can determine, according to the identifier information of the BSS where the AP is located, whether the target receiver of the WUR frame belongs to the user.
  • BSS in order to facilitate the Wi-Fi receiver to filter WUR frames that are not in the BSS where it is located, can avoid Wi-Fi receiving and processing frames that are not related to itself.
  • the identification information of the BSS in which the AP is located includes, for example, a Basic Service Set Identifier (BSSID) or a compressed BSSID, or a hash value of the BSSID, or a part of the BSSID, or a BSS color.
  • BSSID Basic Service Set Identifier
  • the content of the W-SIG includes the identification information of the primary communication interface (such as a Wi-Fi interface) of the target receiving STA of the WUR frame, and the Wi-Fi receiver can receive the STA according to the target of the WUR frame.
  • the identification information of the main communication interface identifies the target receiver of the WUR frame, and can avoid the main communication interface receiving and processing the WUR frame irrelevant to itself, and can also prevent multiple STAs from repeatedly transmitting the AP-WUR wake-up frame.
  • the identity information of the target receiving interface of the WUR frame (such as the 802.11ax interface, the 802.11ax interface belongs to the Wi-Fi interface) includes, for example, the STA's MAC address or compressed MAC address, or the STA's MAC address.
  • the content of the W-SIG domain includes the identification information of the auxiliary wake-up interface (such as the WUR interface) of the target receiving STA of the WUR frame, and the Wi-Fi receiver can receive the assistance of the STA according to the target of the WUR frame.
  • Wake up the identification information of the interface (such as the WUR interface) to identify the target receiver of the WUR frame avoid the 802.11ax interface from receiving and processing frames that are not related to itself, and avoid multiple STAs repeatedly sending AP-WUR wake-up frames.
  • the identification information of the auxiliary wake-up interface (such as the WUR interface) of the target receiving STA of the WUR frame includes, for example, the address of the WUR interface (WUR ID) or the compressed WUR ID, or the hash value of the address of the WUR interface, or the WUR interface address. a part of.
  • the content of the W-SIG domain includes WUR channel information
  • the Wi-Fi receiver can determine the subchannel of the subsequent part of the WUR frame (ie, the OOK modulation part) according to the WUR channel information, to facilitate Wi-Fi.
  • the receiver processes the subsequent portion of the WUR frame (i.e., the OOK modulation portion), for example, a narrowband filtering process.
  • WUR channel information which can be used to indicate the WUR working channel used by WUR frames.
  • the frame by adding one or more OFDM symbols, ie, W-SIG, between the "Legacy 802.11 Preamble" and the "Wake-up Preamble" of the conventional WUR frame, it is indicated whether the frame is The WUR frame, further, may also indicate which type of WUR frame the frame is.
  • W-SIG OFDM symbols
  • the at least one OFDM symbol may be part or all of a WUR frame.
  • the Wi-Fi receiver may identify a WUR frame according to N OFDM symbols after the "Legacy 802.11 Preamble" (the N OFDM symbols may be part of a "Wake-up Preamble"), where N is greater than or Equal to 1.
  • OOK On-Off Keying
  • the Wi-Fi receiver determines whether the frame is a WUR frame according to the N OFDM symbols after the L-SIG, including:
  • Step 1 If the content of the L-SIG and the following N OFDM symbols indicates that the frame is an 802.11ax frame, it is determined that the frame is an 802.11ax frame.
  • the Wi-Fi receiver processes the 802.11ax frame.
  • the second step is performed.
  • Step 2 If the content of the N OFDM symbols after the L-SIG field indicates that the frame is an 802.11a frame (or an 802.11n frame or an 802.11ac frame), it is determined that the frame is an 802.11a frame (or 802.11n) The frame is either an 802.11ac frame).
  • the Wi-Fi receiver processes 802.11a or 802.11n or 802.11ac frames.
  • the third step is performed.
  • the third step if the content of the N OFDM symbols after the L-SIG field is the same as the content of the first N symbols of the "Wake-up Preamble", it may be the first part of the "Wake-up Preamble", or may be all
  • the content determines that the received frame is a WUR frame, and the Wi-Fi receiver continues to receive the frame (continuously receiving the Payload portion of the frame).
  • the processing manner here is the same as the fourth step of the foregoing embodiment, and is not described here for brevity.
  • the frame is processed according to other frame types.
  • the order in which the Wi-Fi receiver performs the first step, the second step, and the third step is not fixed, and the third step may be performed first, and then the second step or the first step may be performed; or, the first Steps, second and third steps are performed simultaneously.
  • the order in which 802.11ax performs the first, second, and third steps is not limited here.
  • the length of the physical frame header of the traditional WUR frame is not increased, but the function of the traditional WUR frame is improved, and one or more symbols in the "Wake-up Preamble" of the traditional WUR frame are utilized, so that The receiver can efficiently identify whether a frame is a WUR frame.
  • the Wi-Fi receiver can determine whether the frame is a WUR frame according to one or more symbols in the received "Wake-up Preamble" or all of the contents of the "Wake-up Preamble". Further, the Wi-Fi receiver can further determine the Which type of WUR frame the frame is.
  • the STA may identify the frame type of the WUR frame without using L_LENGTH, but identify the frame type of the WUR frame by using the content of the WUR frame.
  • at least one OFDM that is, a W-SIG domain
  • the frame may be indicated as a WUR frame by at least one OFDM symbol.
  • the frame type of the WUR frame may be indicated by at least one OFDM symbol.
  • FIG. 7 is a schematic structural diagram of a device according to an embodiment of the present invention.
  • the apparatus can be used to implement the method performed by the sender AP of the frame in the foregoing method embodiments.
  • the apparatus may include: a processing module 710, configured to generate a frame, where the frame includes a first part and a second part, the second part of the frame is located after the first part, and the first part includes an L-SIG domain and At least one OFDM symbol located after the L-SIG domain, the information carried by the at least one OFDM symbol includes: indication information indicating whether the frame is a WUR frame; and a sending module 720, configured to send the frame.
  • a processing module 710 configured to generate a frame, where the frame includes a first part and a second part, the second part of the frame is located after the first part, and the first part includes an L-SIG domain and At least one OFDM symbol located after the L-SIG domain, the information carried by the at least one OFDM symbol includes: indication information indicating
  • the frame is indicated as a WUR frame according to at least one OFDM symbol after the L-SIG field of the frame.
  • the frame type of the WUR frame can be indicated by the L-LENGTH field in the L-SIG domain.
  • At least one OFDM symbol is located in a wake-up preamble of the frame, a position of the wake-up preamble in the frame is located after the L-SIG field in the frame, and a second part of the frame includes at least a wake-up preamble The content after one OFDM symbol.
  • the at least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wake-up preamble in the frame.
  • At least one OFDM symbol after the L-SIG domain is part of the wake-up preamble, and the Wi-Fi receiver needs to receive the complete "Wake-up Preamble", thereby accurately determining whether the frame is a WUR frame. At the same time, there is no increase in the length of the physical frame header of the WUR frame.
  • At least one OFDM symbol is located between the L-SIG domain and the wake-up preamble of the frame, and the second portion of the frame includes a wake-up preamble.
  • adding at least one OFDM symbol between the L-SIG domain and the "Wake-up Preamble" simplifies the operation of identifying the WUR frame.
  • the information carried by the at least one OFDM symbol further includes at least one of the following: a result of the exclusive OR of the content of the L-SIG and a known bit sequence, a modulation and coding manner of the frame, or The length of the frame.
  • the information carried by the at least one OFDM symbol further includes indication information of a frame type, which is used to indicate a frame type of the WUR frame.
  • the frame type of the WUR frame is one of the following: a wake-up frame sent by the AP to the STA, a wake-up radio beacon frame sent by the AP to the STA, or a wake-up frame sent by the STA to the AP.
  • the information carried by the at least one OFDM symbol further includes: identifier information of a primary communication interface of the target receiver of the frame, or identifier information of the auxiliary wake-up interface of the target recipient of the frame.
  • the first portion of the frame includes a legacy 802.11 preamble and the second portion of the frame includes some or all of the WUR payload.
  • FIG. 8 is a schematic structural diagram of another device according to an embodiment of the present invention. As shown in FIG. 8, the device includes components such as a processor 810, a transceiver 820, and a memory 830.
  • Processor 810 can be replaced by processing module 710 in FIG.
  • the processor 810 is configured to generate a frame, where the frame includes a first part and a second part, the second part of the frame is located after the first part, and the first part comprises an L-SIG domain and at least one OFDM symbol located after the L-SIG domain,
  • the information carried by the at least one OFDM symbol includes: indication information indicating whether the frame is a WUR frame; the transceiver 820 can be replaced by the transmitting module 720 in FIG.
  • Transceiver 820 is configured to transmit the frame.
  • the device can also include a bus 840.
  • the processor 810, the transceiver 820, and the memory 830 may be connected to each other through a bus 840.
  • the bus 840 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (abbreviated). EISA) bus and so on.
  • PCI Peripheral Component Interconnect
  • EISA Extended Industry Standard Architecture
  • the bus 840 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 8, but it does not mean that there is only one bus or one type of bus.
  • the frame is indicated as a WUR frame according to at least one OFDM symbol after the L-SIG field of the frame.
  • the frame type of the WUR frame may be indicated by the L-SIG domain L-LENGTH field.
  • At least one OFDM symbol is located in a wake-up preamble of the frame, a position of the wake-up preamble in the frame is located after the L-SIG field in the frame, and a second part of the frame includes at least a wake-up preamble The content after one OFDM symbol.
  • the at least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wake-up preamble in the frame.
  • At least one OFDM symbol after the L-SIG domain is part of the wake-up preamble, and the Wi-Fi receiver needs to receive the complete "Wake-up Preamble", thereby accurately determining whether the frame is a WUR frame.
  • the length of the physical frame header of the frame is not increased.
  • At least one OFDM symbol is located between the L-SIG domain and the wake-up preamble of the frame, and the second portion of the frame includes a wake-up preamble.
  • adding at least one OFDM symbol between the L-SIG domain and the "Wake-up Preamble" simplifies the operation of identifying the WUR frame.
  • the information carried by the at least one OFDM symbol further includes at least one of the following: a result of the exclusive OR of the content of the L-SIG and a known bit sequence, a modulation and coding manner of the frame, or The length of the frame.
  • the information carried by the at least one OFDM symbol further includes indication information of a frame type, which is used to indicate a frame type of the WUR frame.
  • the frame type of the WUR frame is one of the following: a wake-up frame sent by the AP to the STA, a wake-up radio beacon frame sent by the AP to the STA, or a wake-up frame sent by the STA to the AP.
  • the information carried by the at least one OFDM symbol further includes: identifier information of a primary communication interface of the target receiver of the frame, or identifier information of the auxiliary wake-up interface of the target recipient of the frame.
  • the first portion of the frame includes a legacy 802.11 preamble and the second portion of the frame includes some or all of the WUR payload.
  • the device can be implemented by a system-on-a-chip (SoC) or an integrated circuit.
  • SoC system-on-a-chip
  • FIG. 9 is a schematic structural diagram of another device according to an embodiment of the present invention.
  • the device may be used to implement a method performed by a receiver STA of the frame in the foregoing method embodiments.
  • the apparatus includes: a main communication module 910, configured to receive a first portion of a frame, where the first portion includes an L-SIG domain and at least one OFDM symbol located after the L-SIG domain, carried by at least one OFDM symbol
  • the information includes: indication information indicating whether the frame is a WUR frame; the processing module 920 is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, in a case where the frame is determined to be a WUR frame, at least according to the The information carried by the at least one OFDM symbol determines whether to continue receiving the second portion of the frame by the primary communication module 910.
  • the processing module 920 may be a component in the main communication module 910, such as a microprocessor; or the processing module 920 may be composed of multiple components, for example, may include a microprocessor and a processor (such as a CPU), the microprocessor or processor may be external to the processing module 920, or the microprocessor or processor may be integrated in the processing module 920, the microprocessor and processing The processor may perform some processing operations to implement the functions performed by the processing module 920 described above.
  • the first part of the L-SIG The information carried by the at least one OFDM symbol after the domain includes: indication information indicating whether the frame is a WUR frame, where the processing module 920 determines that the frame is a WUR frame according to the at least one OFDM symbol, according to at least one OFDM symbol. A determination is made as to whether the second portion of the frame continues to be received by the primary communication module 910.
  • the first part includes an L-SIG field in the frame
  • the L-SIG field includes an L-LENGTH field
  • the L-LENGTH field is used to indicate a WUR frame. Frame type.
  • the frame type of the frame may also be indicated by an L-LENGTH field in the L-SIG field in the frame.
  • the processing module 920 is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, and if it is determined that the frame is a WUR frame, determine whether to pass the primary according to at least information carried by the at least one OFDM symbol.
  • the continuing the receiving of the second portion of the frame by the communication module 910 includes: if the at least one OFDM symbol indicates that the frame is a WUR frame, and the type of the frame is a frame type of the WUR frame, the processing module 920 determines to continue receiving the frame by the primary communication module 910. the second part.
  • the processing module 920 is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, and if it is determined that the frame is a WUR frame, determine whether to pass the primary according to at least information carried by the at least one OFDM symbol.
  • the communication module 910 continues to receive the second portion of the frame comprising: if at least one OFDM symbol indicates that the frame is a WUR frame, and the frame type of the WUR frame indicated by the L-LENGTH field does not meet the requirements of the device, the primary communication module 910 determines to stop Receive the frame.
  • the at least one OFDM symbol is located in a wake-up preamble included in the second part of the frame, the location of the wake-up preamble in the frame is located after the L-SIG field in the frame, and the second part of the frame includes Wake up the content after at least one OFDM symbol in the preamble. That is to say that at least one OFDM symbol is located after the L-SIG domain.
  • the at least one OFDM symbol is N OFDM symbols, 1 ⁇ N ⁇ M, where M is the number of symbols included in the wake-up preamble in the frame.
  • At least one OFDM symbol after the L-SIG domain is part of the wake-up preamble, and the Wi-Fi receiver needs to receive the complete "Wake-up Preamble", thereby accurately determining whether the frame is a WUR frame. At the same time, there is no increase in the length of the physical frame header of the frame.
  • At least one OFDM symbol is located between the L-SIG domain and the wake-up preamble of the frame.
  • adding at least one OFDM symbol between the L-SIG domain and the "Wake-up Preamble" simplifies the operation of identifying the WUR frame.
  • the information carried by the at least one OFDM symbol further includes at least one of the following: a result of the exclusive OR of the L-SIG content with a known bit sequence, a modulation and encoding manner of the frame, or the frame length.
  • the information carried by the at least one OFDM symbol further includes indication information of a frame type, which is used to indicate a frame type of the WUR frame.
  • the information carried by the at least one OFDM symbol further includes: identification information of a primary communication interface of the target receiver of the frame, or identification information of the auxiliary wake-up interface of the target receiving frame of the frame.
  • the first portion of the frame is a legacy 802.11 preamble and the second portion of the frame is part or all of the WUR payload.
  • FIG. 10 is a schematic structural diagram of another device according to an embodiment of the present invention. As shown in FIG. 10, the device includes a first transceiver 1010, a processor 1030, a memory 1040, and an antenna 1050.
  • the first transceiver 1010 is a specific description of a main communication interface (eg, a Wi-Fi interface), and may be provided by a main communication module (eg, an 802.11 communication module), and the first transceiver 1010 may be configured to send and receive messages. (including receiving a frame transmitted by the first device); can be replaced by the main communication module 910 in FIG.
  • the first transceiver 1010 is configured to receive the first part of the frame, where the first part includes an L-SIG domain and at least one OFDM symbol located after the L-SIG domain, where the information carried by the at least one OFDM symbol includes: used to indicate whether a frame is The indication information of the WUR frame; the processor 1030 may be replaced by the processing module 920 in FIG.
  • the processor 1030 is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, and in the case of determining that the frame is a WUR frame, at least Determining whether to continue receiving the second portion of the frame by the first transceiver 1010 based on information carried by the at least one OFDM symbol.
  • the second portion of the frame is located after the first portion.
  • the processor 1030 is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, and if it is determined that the frame is a WUR frame, determine whether to pass the at least according to the information carried by the at least one OFDM symbol.
  • the continuing to receive the second portion of the frame by the transceiver 1010 includes: if the at least one OFDM symbol indicates that the frame is a WUR frame, and the type of the frame is a frame type of the WUR frame, the processor 1030 determines to continue receiving through the first transceiver 1010. The second part of the frame.
  • the processor 1030 is configured to determine, according to the at least one OFDM symbol, whether the frame is a WUR frame, and if it is determined that the frame is a WUR frame, determine whether to pass the at least according to the information carried by the at least one OFDM symbol.
  • the receiving, by the transceiver 1010, the second portion of the frame includes: if the at least one OFDM symbol indicates that the frame is a WUR frame, and the frame type of the WUR frame indicated by the L-LENGTH field does not meet the requirements of the device, the first transceiver 1010 Make sure to stop receiving the frame.
  • the second device further comprises a second receiver 1020, which is a specific description of the auxiliary communication interface, which can be provided by the auxiliary wake-up module, and the second receiver 1020 can be used to receive the wake-up device The transmitted wake-up frame, and after receiving the wake-up frame, sends a wake-up signal to the first transceiver 1010 to wake up the first transceiver 1010.
  • a second receiver 1020 which is a specific description of the auxiliary communication interface, which can be provided by the auxiliary wake-up module, and the second receiver 1020 can be used to receive the wake-up device The transmitted wake-up frame, and after receiving the wake-up frame, sends a wake-up signal to the first transceiver 1010 to wake up the first transceiver 1010.
  • the number of memories 1040 is not limited to one; the memory 1040 and the processor 1030 may be shared by the first transceiver 1010 and the second receiver 1020.
  • the first transceiver 1010 and the second receiver 1020 can share the same antenna 1050. Sharing the same antenna 1050 is mainly for reducing equipment hardware cost and implementation simplicity. However, when the first transceiver 1010 and the second receiver 1020 operate in different frequency bands, different antennas are needed to meet the actual work requirements.
  • the device can be implemented by a system-on-a-chip (SoC) or an integrated circuit.
  • SoC system-on-a-chip
  • the embodiments provided by the present invention enable the STA to receive the WUR frame through the 802.11 interface, fully utilize the WUR frame, improve the air interface efficiency, and reduce the energy consumption of the device.
  • the specific technical effects may include one or more of the following:
  • the unassociated STA can receive the WUR Beacon frame sent by the AP through the 802.11 interface, thereby discovering the AP and obtaining information related to the AP. This can reduce the time for unassociated STAs to discover APs and reduce STA association delay.
  • the associated STA can receive the WUR Beacon frame sent by the AP through the Wi-Fi interface for time synchronization.
  • the WUR Beacon frame is fully utilized, the air interface efficiency is improved, and the system energy consumption is reduced.
  • the associated STA can receive the STA-WUR wake-up frame sent by the AP through the Wi-Fi interface, respond to the AP in time, and reduce the data transmission delay.
  • the associated STA can listen to the wake-up frame sent by other STAs to the AP-WUR through the Wi-Fi interface to avoid
  • the AP-WUR wake-up frame is repeatedly sent to reduce STA energy consumption, improve air interface efficiency, and reduce the possibility of the STA exposing privacy.
  • Non-transitory media such as random access memory, read only memory, flash memory, hard disk, solid state disk, magnetic tape, floppy disk, optical disc, and any combination thereof.
  • each device embodiment may refer to related methods in the related method embodiments. Partial understanding.

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Abstract

本发明实施例涉及一种发送和接收WUR帧的方法及设备，该方法包括：设备通过设备的主通信模块接收一个帧的第一部分，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示帧是否为WUR帧的指示信息；若至少一个OFDM符号指示帧为WUR帧，则设备至少根据所述至少一个OFDM符号携带的信息确定是否通过所述设备的主通信模块继续接收所述帧的第二部分，该帧的第二部分位于第一部分之后。本发明实施例可以让设备的主通信模块识别WUR帧，充分利用了WUR帧，提高了空口效率、降低了设备功耗。

Description

一种发送和接收WUR帧的方法及设备
本申请要求2016年8月19日提交中国专利局、申请号为CN201610698005.5、发明名称为“一种接收唤醒帧的方法和设备”的中国专利申请的优先权，2016年9月5号提交中国专利局、申请号为CN201610805333.0、发明名称为“一种接收唤醒帧的方法和设备”的中国专利申请的优先权，以及，2017年3月1号提交中国专利局、申请号为CN201710118021.7、发明名称为“一种接收唤醒帧的方法和设备”的中国专利申请的优先权，上述在先申请的全部内容通过引用结合在本申请文件中。仅仅是为了简洁表述，其全部内容不在本申请文件中再原文重复一遍。
技术领域
本发明涉及通信技术领域，尤其涉及一种发送和接收WUR帧的方法及设备。
背景技术
IEEE 802.11标准组织最近新成立了工作组(Task Group，TG)，研究超低功耗唤醒接收机(wake-up receiver，WUR)技术，期望能通过唤醒接收机降低Wi-Fi技术的功耗，同时实现按需(on-demand)数据传输。
WUR是在无线保真(Wireless Fidelity，Wi-Fi)设备上增加的一个低功耗接收机接口。当没有数据接收或传输时，设备的主通信模块(如Wi-Fi模块)进入深度休眠模式(如关闭主通信模块的收发机)，并打开辅助唤醒模块(如WUR模块)进行超低功耗侦听。例如，当第一设备(唤醒设备，例如，接入点(Access point))需要与第二设备(被唤醒设备，例如，站点(Station，STA))通信时，第一设备先向第二设备的WUR模块发送唤醒帧(wake-up packet,WUP)。第二设备的WUR模块收到唤醒帧后，查看所述唤醒帧的接收者地址和确认所述唤醒帧的正确性和真实性。如果所述唤醒帧的接收者地址匹配第二设备的WUR模块的地址，并且唤醒帧是真实的、正确的，第二设备的WUR模块可以发送唤醒信号给第二设备的Wi-Fi通信模块，以唤醒第二设备Wi-Fi通信模块。发送完唤醒信号以后，第二设备的WUR模块可以选择进入休眠状态。相比直接开启Wi-Fi模块侦听信道，采用WUR能够显著降低设备STA的功耗。
现有技术中，WUR帧(例如，WUR Beacon帧，或，唤醒帧WUP等)是专为WUR模块设计的，只有WUR模块才能识别和接收WUR帧。如附图4所示,现有技术中的WUR帧可能包括传统802.11前导(Legacy 802.11Preamble)、WUR载荷(WUR Payload)，其中，传统802.11前导可以包括传统短训练域(non-High-Throughput Short Training Field，L-STF)、传统长训练域(non-High-Throughput Long Training Field，LTF)、L-SIG域；WUR载荷可以包括唤醒前导和MAC部分，唤醒前导用于符号同步、WUR帧起始识别和自动增益控制(Automatic Gain Control，AGC)调整等；MAC部分可以包括MAC头和帧体(Frame Body，FB)，还可以进一步包括帧校验序列(Frame Check Sequence,FCS)。
在附图1所示的一种可能的应用场景中，如果第一设备AP当前发送的是WUR Beacon帧，而未关联的STA2(不具备WUR模块的STA2)当前打开的仅是Wi-Fi接口，由于现有技术中只有WUR模块才能接收WUR帧，故未关联的STA2就会错失接收WUR Beacon帧的机会和发现AP的机会；在另一种可能的应用场景中，如果第一设备AP当前发送的是WUR帧，而STA3的Wi-Fi接口开着，但是STA3的WUR模块对应的接口(即WUR接口)关着，STA3就无法获得AP发送的WUR帧。在上述的两种场景中，WUR帧没有被充分利用，会造成能量浪费和空口资源浪费。
发明内容
本发明实施例涉及一种发送和接收WUR帧的方法及设备，以解决现有技术中WUR帧没有被充分利用的问题。
在第一方面，本发明实施例提供了一种接收WUR帧的方法，该接收WUR帧的方法包括：设备通过设备的主通信模块(如Wi-Fi接口)接收一个帧的第一部分，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示该帧是否为WUR帧的指示信息；若至少一个OFDM符号指示该帧为WUR帧，则该设备根据至少一个OFDM符号携带的信息确定是否通过该设备的主通信模块继续接收该帧的第二部分，或者停止接收该帧，该帧的第二部分位于第一部分之后。
本发明实施例中，在接收L-SIG域之后至少一个OFDM符号，若至少一个OFDM符号携带的信息指示该帧为WUR帧，则继续接收该帧的第二部分，或者停止接收该帧。
在一个可能的实施例中，L-SIG域包括L-LENGTH域，在该帧为WUR帧的情况下，L-LENGTH域用于指示WUR帧的帧类型。
在一个可能的实施例中，若至少一个OFDM符号指示该帧为WUR帧，则设备至少根据至少一个OFDM符号携带的信息确定是否通过设备的主通信模块继续接收该帧的第二部分，包括：若至少一个OFDM符号指示该帧为WUR帧，且L-LENGTH域指示的WUR帧的帧类型符合设备的需求，则该设备通过该设备的主通信模块继续接收该帧的第二部分。
在一个可能的实施例中，若至少一个OFDM符号指示该帧为WUR帧，则设备至少根据至少一个OFDM符号携带的信息确定是否通过设备的主通信模块继续接收该帧的第二部分，包括：若至少一个OFDM符号指示该帧为WUR帧，且L-LENGTH域指示的WUR帧的帧类型不符合该设备的需求，则停止接收该帧。
在一个可能的实施例中，至少一个OFDM符号是唤醒前导(Wake-up Preamble)的一部分，该帧中的唤醒前导的位置位于该帧的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容，也因此没有增加帧的物理帧头的长度。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数，符号可以是通断键控(On-Off Keying，OOK)符号或者OFDM符号。
在一个可能的实施例中，在L-SIG域和“Wake-up Preamble”之间增加至少一个OFDM符号，该帧的第二部分包括唤醒前导，简化了识别WUR帧的操作。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括如下信息中的至少一 个：L-SIG的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在至少一个OFDM符号指示该帧为WUR帧的情况下，至少一个OFDM符号携带的信息还包括：帧类型的指示信息，用于指示WUR帧的帧类型。
在一个可能的实施例中，WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括：该帧的目标接收者的主通信接口的标识信息，或者，该帧的目标接收者的辅助唤醒接口的标识信息。
在一个可能的实施例中，该帧的第一部分为传统802.11前导，该帧的第二部分为包括WUR载荷的部分或全部。
在第二方面，本发明实施例提供了一种发送WUR帧的方法，该发送WUR帧的方法包括：设备生成一个帧，该帧包括第一部分和第二部分，该帧的第二部分位于第一部分之后，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示该帧是否为WUR帧的指示信息；发送该帧。
本发明实施例中，通过该帧中L-SIG域之后的至少一个OFDM符号，指示该帧为WUR帧。
在一个可能的实施例中，在该帧为WUR帧的情况下，通过L-SIG域包括L-LENGTH域，L-LENGTH域用于指示WUR帧的帧类型。
在一个可能的实施例中，至少一个OFDM符号是唤醒前导的一部分，该帧中的唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容，也因此没有增加该帧的物理帧头的长度。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数，符号可以是OOK符号或者OFDM符号。
在一个可能的实施例中，在L-SIG域和“Wake-up Preamble”之间增加至少一个OFDM符号，该帧的第二部分包括唤醒前导，简化了识别WUR帧的操作。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括如下信息中的至少一个：L-SIG的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在至少一个OFDM符号指示该帧为WUR帧的情况下，至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示WUR帧的帧类型。
在一个可能的实施例中，WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括该帧的目标接收者的主通信接口的标识信息，或者，该帧的目标接收者的辅助唤醒接口的标识信息。
在一个可能的实施例中，该帧的第一部分为传统802.11前导，该帧的第二部分为WUR载荷的部分或全部。
在第三方面，本发明实施例提供了一种设备，该设备包括：主通信模块，用于接收一 个帧的第一部分，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号；至少一个OFDM符号携带的信息包括：用于指示该帧是否为WUR帧的指示信息；处理模块，用于根据至少一个OFDM符号确定该帧是否为WUR帧；主通信模块还用于，在处理模块确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号携带的信息确定是否通过主通信模块继续接收该帧的第二部分，或者停止接收该帧，该帧的第二部分位于第一部分之后。
本发明实施例中，在处理模块根据该帧的第一部分确定该帧是WUR帧，主通信模块继续接收该帧中第一部分之后的第二部分，或者停止接收该帧。
在一个可能的实施例中，处理模块用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据至少一个符号携带的信息确定是否通过主通信模块继续接收该帧的第二部分包括：若至少OFDM符号指示该帧为WUR帧，且该帧的类型为WUR帧的帧类型，则处理模块确定通过主通信模块继续接收该帧的第二部分。
在一个可能的实施例中，处理模块用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号携带的信息确定是否通过主通信模块继续接收该帧的第二部分包括：若至少一个OFDM符号指示该帧为WUR帧，且L-LENGTH域指示WUR帧的帧类型不符合设备的需求，则处理模块继续接收该帧。
在一个可能的实施例中，若至少一个OFDM符号指示该帧为WUR帧，则设备通过设备的主通信模块停止接收该帧，包括：若至少一个OFDM符号指示该帧为WUR帧，根据设备的需求信息，停止接收该帧。
在一个可能的实施例中，至少一个OFDM符号是唤醒前导的一部分，该帧中的唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容，也因此没有增加帧的物理帧头的长度。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数，符号可以是OOK符号或者可以是OFDM符号。
在一个可能的实施例中，在L-SIG域和“Wake-up Preamble”之间增加至少一个OFDM符号，该帧的第二部分包括唤醒前导，简化了识别WUR帧的操作。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括如下信息中的至少一个：L-SIG的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在至少一个OFDM符号指示该帧为WUR帧的情况下，至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示WUR帧的帧类型。
在一个可能的实施例中，WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括：该帧的目标接收者的主通信接口的标识信息，或者，该帧的目标接收者的辅助唤醒接口的标识信息。
在一个可能的实施例中，该帧的第一部分为传统802.11前导，该帧的第二部分为WUR载荷的全部或部分。
在第四方面，本发明实施例提供了一种设备，该设备包括：处理模块，用于生成一个帧，该帧包括第一部分和第二部分，该帧的第二部分位于第一部分之后，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示该帧是否为WUR帧的指示信息；发送模块，用于发送该帧。
在一个可能的实施例中，在该帧为WUR帧的情况下，可通过L-SIG域包括L-LENGTH域指示WUR帧的帧类型。
在一个可能的实施例中，所述至少一个OFDM符号是唤醒前导的一部分，该帧中的唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容，也因此没有增加该帧的物理帧头的长度。
在一个可能的实施例中，所述至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数，符号可以是OOK符号或者OFDM符号。
在一个可能的实施例中，在L-SIG域和“Wake-up Preamble”之间增加至少一个OFDM符号，该帧的第二部分包括唤醒前导，简化了识别WUR帧的操作。
在一个可能的实施例中，所述至少一个OFDM符号携带的信息还包括如下信息中的至少一个：L-SIG的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在所述至少一个OFDM符号指示该帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示WUR帧的帧类型。
在一个可能的实施例中，所述WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
在一个可能的实施例中，所述至少一个OFDM符号携带的信息还包括该帧的目标接收者的主通信接口的标识信息，或者，该帧的目标接收者的辅助唤醒接口的标识信息。
在一个可能的实施例中，该帧的第一部分为传统802.11前导，该帧的第二部分为WUR载荷的部分或全部。
在第五方面，本发明实施例提供了一种WUR帧，该WUR帧包括：第一部分和位于第一部分之后的第二部分，所述第一部分包括L-SIG域和位于所述L-SIG域之后的至少一个OFDM符号，所述至少一个OFDM符号携带的信息包括：用于指示该帧为WUR帧的指示信息。本发明实施例提供的具有上述结构的WUR帧，可以使得接收者的主通信模块(如Wi-Fi接口)可以识别WUR帧，从而使得不具备WUR接口或WUR接口处于休眠状态的接收者，可以使用该接收者具有的主通信模块来识别WUR帧，进而可以根据需求选择是否接收该WUR帧的剩余部分，使得WUR帧得到更多的利用。
在一个可能的实施例中，L-SIG域包括L-LENGTH域，在该帧为WUR帧的情况下，L-LENGTH域用于指示WUR帧的帧类型。在确定接收的帧为WUR帧之后，可以通过L-LENGTH域指示WUR帧的帧类型。
在一个可能的实施例中，所述至少一个OFDM符号位于该帧中的唤醒前导中，该帧中的唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个 OFDM符号之后的内容。因此没有增加该帧的物理帧头的长度。
在一个可能的实施例中，所述至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数。
在一个可能的实施例中，所述至少一个OFDM符号位于L-SIG域与该帧的唤醒前导之间，该帧的第二部分包括唤醒前导。
在一个可能的实施例中，所述至少一个OFDM符号携带的信息还包括如下信息中的至少一个：所述L-SIG的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在至少一个OFDM符号指示该帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示WUR帧的帧类型。在确定该帧为WUR帧之后，还可以通过所述至少一个OFDM符号指示WUR帧的帧类型。
在一个可能的实施例中，所述WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
在一个可能的实施例中，所述至少一个OFDM符号携带的信息还包括：该帧的目标接收者的主通信接口的标识信息，或者，该帧的目标接收者的辅助唤醒接口的标识信息。
在一个可能的实施例中，该帧的第一部分包括传统802.11前导，该帧的第二部分包括WUR载荷的部分或全部。
本发明还提供了多个方法实施例和装置实施例，包括如下第六方面至第十二方面所提供的多个实施例：
在第六方面，本发明实施例提供了一种接收唤醒帧的方法，该接收唤醒帧的方法包括：STA通过STA的Wi-Fi接口(802.11接口)接收一个帧的一部分，该帧的一部分包括：L-SIG域和L-SIG域之后的至少一个OFDM符号，其中，L-SIG域中包含了L_LENGTH域；STA根据该帧的L-SIG域的L_LENGTH、以及L-SIG域之后的至少一个OFDM符号识别该帧是WUR帧以及WUR帧的类型,至少根据WUR帧的类型决定是否继续接收WUR帧。
本发明实施例中，由STA的Wi-Fi接口(802.11接口)接收的L-SIG域和L-SIG域之后至少一个OFDM符号，识别该帧是WUR帧以及WUR帧的类型，STA的Wi-Fi接口(802.11接口)根据WUR帧的类型确定是否接收WUR帧。
在一个可能的实施例中，当L_LENGTH mod 3＝第一值时，则WUR帧的类型是AP发送的WUR Beacon帧，WUR帧携带AP相关信息和时间同步信息，其中第一值是1或2。
在一个可能的实施例中，当L_LENGTH mod 3＝第一值时，则WUR帧的类型是STA发送的AP-WUR唤醒帧，AP-WUR唤醒帧用于唤醒AP的802.11模块，其中第一值是1或2。
在一个可能的实施例中，当L_LENGTH mod 3＝第二值时，则WUR帧的类型是AP发送的STA-WUR唤醒帧，STA-WUR唤醒帧用于唤醒STA的802.11模块，其中第二值是1或2。
在一个可能的实施例中，如果L_LENGTH满足L_LENGTH mod 3≠0，则STA继续接收该帧的L-SIG域之后的N个OFDM符号；如果L_LENGTH不满足L_LENGTH mod 3≠0，则STA停止接收该帧；其中，N的取值是1,2,3，或者是Wake-up Preamble的长度。
在第七方面，本发明实施例提供了一种设备，该设备包括：存储器、处理器、第一接口和第二接口；该存储器用于存储指令；该处理器用于调用该存储器存储的指令，通过第一接口和第二接口执行接收唤醒帧的方法。
在一个可能的实施例中，第一接口为Wi-Fi接口。
在一个可能的实施例中，第二接口为辅助唤醒接口。
在第八方面，本发明实施例提供了一种发送唤醒帧的方法，该发送唤醒帧的方法包括：AP生成WUR帧，WUR帧至少包括L-SIG域和L-SIG域之后的至少一个OFDM符号，L-SIG域至少包括L_LENGTH域，L_LENGTH域和/或L-SIG域之后的至少一个OFDM符号用于指示一个帧是WUR帧以及WUR帧的类型；AP发送WUR帧给至少一个STA。
本发明实施例中，通过一个帧中L-SIG域里的L_LENGTH域、以及L-SIG域之后的至少一个OFDM符号，指示该帧为WUR帧以及WUR帧的帧类型。
在一个可能的实施例中，当L_LENGTH mod 3＝第一值时，WUR帧是AP发送的WUR Beacon帧，WUR帧携带AP相关信息和时间同步信息等，其中第一值是1或2。
在一个可能的实施例中，当L_LENGTH mod 3＝第一值时，WUR帧是STA生成和发送的AP-WUR唤醒帧，WUR帧是用来唤醒AP的802.11模块，其中第一值是1或2。
在一个可能的实施例中，当L_LENGTH mod 3＝第二值时，WUR帧是AP发送的STA-WUR唤醒帧，WUR帧是用来唤醒STA的802.11模块，其中第二值是1或2，第二值与第一值不同。
在第九方面，本发明实施例提供了一种设备，该设备包括：存储器、处理器、第一接口和第二接口；该存储器用于存储指令；该处理器用于调用该存储器存储的指令，通过第一接口和第二接口执行发送唤醒帧的方法。
在一个可能的实施例中，第一接口为Wi-Fi接口。
在一个可能的实施例中，第二接口为辅助唤醒接口。
在第十方面，本发明实施例提供了一种接收唤醒帧的方法，该接收唤醒帧的方法包括：AP生成WUR帧，WUR帧至少包括L-SIG域和L-SIG域之后的至少一个OFDM符号，L-SIG域至少包括L_LENGTH域，L_LENGTH域和/或L-SIG域之后的至少一个OFDM符号可以用于指示一个帧是WUR帧以及WUR帧的类型；AP发送WUR帧给至少一个STA；至少一个STA通过Wi-Fi接口(802.11接口)接收WUR帧；至少一个STA根据该帧的L_LENGTH和/或L-SIG域之后的至少一个OFDM符号识别该帧是WUR帧以及WUR帧的类型，并根据自身需求及WUR帧的类型决定是否继续接收WUR帧。
本发明实施例中，AP采用L-SIG域里的L_LENGTH域和L-SIG域之后的至少一个OFDM符号指示该帧是WUR帧以及WUR帧类型，若STA的Wi-Fi接口接收到该帧，该帧的L_LENGTH和/或L-SIG域之后的至少一个OFDM符号识别该帧是WUR帧以及WUR帧的类型，STA可根据自身需求及WUR帧的类型决定是否继续接收WUR帧。
在一个可能的实施例中，当L_LENGTH mod 3＝第一值时，WUR帧是AP发送的WUR Beacon帧，WUR帧携带AP相关信息和时间同步信息等，其中第一值是1或2。
在一个可能的实施例中，当L_LENGTH mod 3＝第一值时，WUR帧是STA生成和发送的AP-WUR唤醒帧，WUR帧是用来唤醒AP的802.11模块，其中第一值是1或2。
在一个可能的实施例中，当L_LENGTH mod 3＝第二值时，WUR帧是AP发送的STA-WUR唤醒帧，WUR帧是用来唤醒STA的802.11模块，其中第二值是1或2，第二值与第一值不同。
在一个可能的实施例中，如果L_LENGTH满足L_LENGTH mod 3≠0，则至少一个STA继续接收L-SIG域之后的N个OFDM符号；如果L_LENGTH不满足L_LENGTH mod3≠0，则至少一个STA停止接收该帧；其中，N的取值是1,2,3，或者是Wake-up Preamble的长度。
在一个可能的实施例中，L-SIG域之后的至少一个OFDM符号携带以下信息中的一种或多种：WUR帧的目标接收STA的主通信接口(如Wi-Fi接口)的标识信息，WUR帧的目标接收STA的辅助唤醒接口(如WUR接口)的标识信息，和WUR帧的发送者信息。
在一个可能的实施例中，L-SIG域之后的至少一个OFDM符号还进一步携带以下信息中的一种或多种：WUR帧指示信息，和WUR帧的发送者所在的基本服务集有关的信息。
在第十一方面，本发明实施例提供了一种发送WUR帧的方法，该发送WUR帧的方法包括：AP生成WUR帧，WUR帧至少包括L-SIG域和L-SIG域之后的至少一个OFDM符号，L-SIG域至少包括L_LENGTH域，L_LENGTH域和/或L-SIG域之后的至少一个OFDM符号用于指示一个帧是WUR帧；L-SIG域之后的至少一个OFDM符号携带WUR帧的目标接收者STA的主通信接口(如Wi-Fi接口)的标识信息；AP发送WUR帧给至少一个STA。
本发明实施例中，通过该帧中L-SIG域里的L_LENGTH域和L-SIG域之后的至少一个OFDM符号指示该帧是WUR帧。
在一个可能的实施例中，L-SIG域之后的至少一个OFDM符号还携带以下信息中的一种或多种：WUR帧的目标接收者STA的辅助唤醒接口(如WUR接口)的标识信息，和WUR帧的发送者信息。
在一个可能的实施例中，L-SIG域之后的至少一个OFDM符号还进一步携带以下信息中的一种或多种：WUR帧指示信息，WUR帧类型信息，和WUR帧的发送者所在的基本服务集有关的信息。
在第十二方面，本发明实施例提供了一种接收WUR帧的方法，该接收WUR帧的方法包括：STA通过STA的Wi-Fi接口(802.11接口)接收一个帧的一部分，该帧的一部分包括：L-SIG域和L-SIG域之后的至少一个OFDM符号，其中，L-SIG域中包含了L_LENGTH域；STA至少根据该帧的L_LENGTH和/或L-SIG域之后的至少一个OFDM符号识别该帧是WUR帧；STA至少根据WUR帧的L_LENGTH和/或L-SIG域之后的至少一个OFDM符号获得WUR帧的目标接收STA的主通信接口(如Wi-Fi接口)的标识信息；STA至少根据WUR帧的类型决定是否继续接收WUR帧。
本发明实施例中，通过STA的Wi-Fi接口接收的该帧中L-SIG域里的L_LENGTH域和L-SIG域之后的至少一个OFDM符号识别该帧是WUR帧，以及根据L_LENGTH和/或L-SIG域之后的至少一个OFDM符号获得WUR帧的目标接收STA的Wi-Fi接)的标识信息。STA还可以根据WUR帧的类型决定继续接收WUR帧。
在一个可能的实施例中，L-SIG域之后的至少一个OFDM符号携带以下信息中的一种或多种：WUR帧的目标接收STA的辅助唤醒接口(如WUR接口)的标识信息，和WUR帧的发送者信息。
在一个可能的实施例中，L-SIG域之后的至少一个OFDM符号还进一步携带以下信息中的一种或多种：WUR帧指示信息，以及和WUR帧的发送者所在的基本服务集有关的信息。
基于上述技术方案，本发明实施例提供的发送和接收WUR帧的方法及设备，根据一个帧中L-SIG域之后的至少一个OFDM符号，指示该帧是否为WUR帧。本发明提供的实施例可以使得Wi-Fi接口能识别WUR帧，从而能充分利用WUR帧，提高了空口效率、降低了设备功耗。
附图说明
图1为现有技术中接收WUR帧的示意图；
图2为本发明实施例提供的一种通信系统架构示意图；
图3为本发明实施例提供的发送和接收WUR帧的方法流程图；
图4为现有技术中WUR帧的格式示意图；
图5为本发明的一个实施例提供的发送和接收WUR帧的方法流程图；
图6a为本发明的一个实施例提供的一种WUR帧格式的示意图；
图6b为本发明的一个实施例提供的另一种WUR帧格式的示意图；
图7为本发明实施例提供的一种设备的结构示意图；
图8为本发明实施例提供的另一种设备的结构示意图；
图9为本发明实施例提供的一种设备的结构示意图；
图10为本发明实施例提供的另一种设备的结构示意图。
具体实施方式
图2为本发明实施例提供的一种通信系统架构示意图。所述通信系统包括第一设备10和第二设备20。第一设备10或第二设备20的数量可以不止一个，图2仅各示出一个为例进行说明。
第一设备10向第二设备20发送消息，第二设备20接收第一设备10发送的消息。在一个可能的实施例中，第二设备20包括第一收发机201和第二接收机202，第二设备20能通过第一收发机201接收第一设备10发送的Wi-Fi消息。其中，第二设备20通过第二接收机202接收第一设备10发送的WUR格式的唤醒帧(所述唤醒帧属于WUR帧的一种)后，第二设备20会唤醒处于休眠状态(如关闭状态)的第一收发机201，并通过第一收发机201接收第一设备10发送给第二设备20的Wi-Fi消息。
在一个可能的实施例中，第二设备20可以包括第一收发机201，第一收发机201可 以由主通信模块提供，例如，由802.11通信模块提供，该第一收发机201可用于发送和接收消息，该消息包括但不限于Wi-Fi消息和WUR帧。
在一个可能的实施例中，第二设备20还包括第二接收机202，第二接收机202可由辅助唤醒模块(如WUR)提供，该第二接收机202可用于接收第一设备10发送的WUR格式的唤醒帧，并在接收唤醒帧之后向第一收发机201发送唤醒信号，以唤醒第一收发机201，并通过第一收发机201接收后续第一设备10发送的Wi-Fi消息。
需要说明的是，第一设备10和第二设备20可以进行替换，在此为了方面论述，只以第一设备10向第二设备20发送消息为示例进行说明。
本文中，WUR帧的帧类型可以包括多种，即，可以有多种类型的WUR帧，WUR帧的帧类型可以包括以下几种(可参见表1)：
第一种：AP发送的WUR Beacon帧，即AP广播的WUR Beacon帧，可以携带AP相关的信息和/或时间同步信息等。
第二种：AP发送的STA-WUR唤醒帧，即AP发送给STA的WUR的唤醒帧，可能是通过OFDMA方式同时发送WUR唤醒帧给多个STA。
第三种：STA发送的AP-WUR唤醒帧，即STA发送给AP的WUR的唤醒帧。
下面结合附图，通过具体的实施例对本发明实施例提供的一种发送和接收WUR帧的方法及设备进行详细说明。
图3为本发明实施例提供的一种发送和接收WUR帧的方法的流程图。如图3所示，该发送和接收WUR帧的方法可以包括以下步骤：
步骤301：第一设备向第二设备发送一个帧，该帧包括第一部分和第二部分，该帧的第二部分位于第一部分之后，所述第一部分包括传统信号域L-SIG域(Legacy Signal Field,即，non-High-Throughput(non-HT)Signal Field)和位于所述L-SIG域之后的至少一个OFDM符号，所述至少一个OFDM符号携带的信息包括：用于指示该帧是否为WUR帧的指示信息。若该帧为WUR帧，则该WUR帧中的所述至少一个OFDM符号携带的信息包括：用于指示该帧为WUR帧的指示信息。
在一个可能的实施例中，第一设备采用Wi-Fi收发机(即满足Wi-Fi标准协议的Wi-Fi接口)进行WUR帧的接收和发送。第一设备也可以采用其他类型的收发机(如，WUR)进行WUR帧的接收和发送，不在此赘述。
在一个可能的实施例中，在该帧为WUR帧的情况下(如，所述至少一个OFDM符号指示该帧为WUR帧)，可进一步通过该帧的L-SIG域里的L-LENGTH域指示该WUR帧具体的帧类型，即指示该WUR帧是哪一种类型的WUR帧。
在一个可能的实施例中，所述至少一个OFDM符号位于该帧的唤醒前导中，如图6a所示，所述至少一个OFDM符号610位于该帧的唤醒前导中。该帧中的唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容。
所述至少一个OFDM符号位于L-SIG域之后可以包括：所述至少一个OFDM符号可能是紧挨着所述L-SIG域之后(如图6a所示，所述至少一个OFDM符号610位于该帧的唤醒前导中，且紧挨着所述L-SIG域之后)；或者，所述至少一个OFDM符号并非紧挨着 所述L-SIG域之后，而是在所述L-SIG域之后的一个或多个符号(每个符号可以是OOK符号或者OFDM符号)之后。若所述至少一个OFDM符号是紧挨着L-SIG域之后，则该帧的接收者，如，STA，可以在接收到该帧的很短的一部分信息(例如，这种情况下，可以只需接收到该帧的传统802.11前导和紧挨其后的至少一个OFDM符号)之后，STA即可识别该帧是否为WUR帧，从而可以根据自身需求来确定是否继续接收该帧的剩余部分，节省了STA的功耗。如果所述至少一个OFDM符号紧挨着L-SIG域，则所述第二部分包括所述唤醒前导中除所述至少一个OFDM符号之外的内容；如果所述至少一个OFDM符号不是紧挨着L-SIG域，则所述第二部分不包括唤醒前导中所述至少一个OFDM符号及所述至少一个OFDM符号之前的内容。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数，该符号可以是OOK符号或者OFDM符号。
在一个可能的实施例中，至少一个OFDM符号位于L-SIG域与该帧的唤醒前导之间，该帧的第二部分包括所述唤醒前导，所述至少一个OFDM符号的位置与现有的WUR帧的各个域的位置无重叠，相互独立，方便和简化了接收者识别WUR帧的操作。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括如下信息中的至少一个：L-SIG域的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在所述至少一个OFDM符号指示该帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还可以包括帧类型的指示信息，用于指示该WUR帧的具体的帧类型，即指示该WUR帧是哪一种类型的WUR帧。
在一个可能的实施例中，WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧或者唤醒无线电信标帧，STA发送给AP的唤醒帧。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括该帧的目标接收者的主通信接口的标识信息，或者，该帧的目标接收者的辅助唤醒接口的标识信息。
在一个可能的实施例中，该帧的第一部分为传统802.11前导，该帧的第二部分为WUR载荷的部分或全部。
步骤302：第二设备通过第二设备的主通信模块接收第一设备发送的该帧的第一部分。
在一个可能的实施例中，第二设备可以采用Wi-Fi收发机(即满足Wi-Fi标准协议的Wi-Fi接口)进行所述帧(可以是WUR帧)的接收。Wi-Fi接口一个具体的例子为Wi-Fi收发机，Wi-Fi接口可由主通信模块提供。主通信模块用于接收和发送消息。
在一个可能的实施例中，第一设备为接入点(Access Piont，AP)，第二设备为站点(Station，STA)，AP或STA的数量可以不止一个。在STA处于休眠状态时，AP需要给STA发送数据时，在AP给STA发送数据之前，由AP给STA设备先发送一个WUR帧。
在另一个可能的实施例中，第一设备为STA，第二设备为AP，AP或STA的数量可以不止一个。在AP处于休眠状态时，STA需要给AP发送数据时，在STA给AP发送数据之前，由STA给AP先发送一个WUR帧。
为了叙述方便，下文中，以AP给STA发送WUR帧的场景为例进行说明。因STA给AP发送WUR帧和AP给STA发送WUR帧的机制是一样的，故不再赘述STA给AP发送WUR帧的过程。在一个可能的实施例中，AP通过Wi-Fi接口或者WUR接口发送WUR帧。
需要说明的是，WUR接口可由辅助唤醒模块提供，用于接收其他设备发送的唤醒帧。
在一个可能的实施例中，所述至少一个OFDM符号位于该帧中L-SIG域之后，所述至少一个OFDM符号用于指示该帧为WUR帧。
所述至少一个OFDM符号在该帧中的位置可以为以下(1)～(3)三种可能的情况中的一种：
(1)至少一个OFDM符号为N个OFDM，1≤N≤M，该N个OFDM符号为唤醒前导所包括的符号的个数,其中M为所述帧中唤醒前导所包括的符号的个数。所述N个OFDM符号用于指示该帧为WUR帧。
在一个可能的实施例中，所述N个OFDM符号是唤醒前导最前面的若干个符号，如3个符号。
在一个可能的实施例中，第一部分包括该帧中的L-SIG域，L-SIG域包括L-LENGTH域，L-LENGTH域用于指示该帧的帧类型。
具体地，在STA确定该帧为WUR帧的情况下，STA还可以通过该WUR帧的L-SIG域里面的L-LENGTH域来进一步确定该WUR帧的帧类型，例如，可通过该WUR帧的L-SIG域的L-LENGTH的值对3取模的结果的不同，来确定该WUR帧具体的帧类型。
WUR帧的帧类型可以如表1所示：
表1
L-SIG里L-LENGTH WUR帧的帧类型
L-LENGTH mod 3＝1 AP发送的WUR Beacon帧(广播的WUR帧，SU-OFDM)
L-LENGTH mod 3＝1 STA发送给AP的WUR的唤醒帧(SU帧，SU-OFDM)
L-LENGTH mod 3＝2 AP发送给STA的WUR的唤醒帧(可以是MU-OFDMA帧)
在一个可能的实施例中，在STA确定该帧为WUR帧的情况下，STA可以根据AP发送的唤醒帧携带的接收者的地址信息，确定是否通过所述STA的Wi-Fi收发机继续接收所述唤醒帧的第二部分。如，若唤醒帧携带的接收者的地址信息与该STA的相关地址信息匹配，则STA确定继续接收所述唤醒帧的第二部分。
在另一个可能的实施例中，在STA确定该帧为WUR帧的情况下，STA可以根据自身的需求确定是否通过所述STA的Wi-Fi收发机继续接收所述WUR帧的第二部分，例如，根据表1所列举的帧类型的指示规则，STA根据自身的需求确定继续接收所述WUR帧的第二部分的情况可以包括以下几种中的一种或多种：
第一种情况：未关联的STA接收AP发送的WUR Beacon帧。
第二种情况：已关联的STA接收AP发送的WUR Beacon帧。
第三种情况：已关联的STA串听其它STA发送给AP的WUR的唤醒帧。
(2)在现有技术的WUR帧结构的基础上，在L-SIG域和唤醒前导之间增加至少一 个OFDM符号，来指示该帧为WUR帧。
如图6b所示，具体地，在L-SIG域和唤醒前导之间加入一个或多个OFDM符号，可以称之为WUR SIG(W-SIG)域，所述W-SIG域用于指示所述帧是WUR帧。进一步的，可以通过W-SIG域指示该WUR帧具体的帧类型。
在一个可能的实施例中，STA在接收一个帧的过程中，可以根据L-SIG域之后的1个或多个OFDM符号来判断该帧是否是WUR帧。
具体地，在一个可能的实施例中，STA在通过STA的Wi-Fi接收机接收一个帧的过程中，如，在通过STA的Wi-Fi接收机接收了该帧的第一部分后，在STA发现该帧的L-SIG域之后的1个或多个OFDM符号是W-SIG域的情况下，则STA可以确定该帧为WUR帧，STA可以通过STA的Wi-Fi接收机继续接收该帧的第二部分，或者STA也可以停止接收该帧。若STA发现L-SIG域之后的1个或多个OFDM符号不是W-SIG域，则STA可以确定该帧不是WUR帧，STA可按照该帧为其它帧的情况来对待该帧。
(3)至少一个OFDM符号为N个OFDM符号，1≤N≤M，M为唤醒中唤醒前导包括的符号个数，该符号可以是OOK符号或者是OFDM符号。N个OFDM符号用于指示该帧是否为WUR帧。
具体地，在一种实施例中，Wi-Fi接收机可以根据L-SIG域之后的N个OFDM符号，确定该帧是否是WUR帧(如，Wi-Fi接收机中可以包括有微处理器，如DSP(Digital Signal Processor，数字信号处理器),由该微处理器来根据L-SIG域之后的N个OFDM符号判断该帧是否是WUR帧)，N的取值可以是唤醒前导包括的符号数M，或者N的取值可以小于M。在另一种实施例中，可以是STA中Wi-Fi接收机之外的一个处理器(如图10中的1030)来根据L-SIG域之后的N个OFDM符号判断该帧是否是WUR帧。
步骤303：若所述至少一个OFDM符号指示该帧为WUR帧，则第二设备至少根据所述至少一个OFDM符号携带的信息确定是否通过所述第二设备的主通信模块继续接收该帧的第二部分，该帧的第二部分位于第一部分之后。
在一个可能的实施例中，若至少一个OFDM符号指示帧为WUR帧，则第二设备通过第二设备的主通信模块继续接收帧的第二部分，包括：若至少一个OFDM符号指示该帧为WUR帧，且该帧的类型为WUR帧的帧类型，第二设备通过第二设备的主通信模块继续接收该帧的第二部分。
在一个可能的实施例中，若所述至少一个OFDM符号指示帧为WUR帧，则第二设备至少根据所述至少一个OFDM符号携带的信息确定是否通过第二设备的主通信模块继续接收该帧的第二部分，包括：若所述至少一个OFDM符号指示该帧为WUR帧，且所述L-LENGTH域指示的WUR帧的帧类型符合设备的需求，则所述设备通过该设备的主通信模块继续接收该帧的第二部分。
在一个可能的实施例中，若所述至少一个OFDM符号指示该帧为WUR帧，则第二设备至少根据所述至少一个OFDM符号携带的信息确定是否通过设备的主通信模块继续接收该帧的第二部分，包括：若所述至少一个OFDM符号指示该帧为WUR帧，且所述L-LENGTH域指示的WUR帧的帧类型不符合设备的需求，则所述设备停止接收该帧。
需要说明的是，设备的需求可以是由第二设备内部的具体的运作来确定。例如，第二设备在接收该帧的第一部分后，确定该帧为WUR帧，但是由于第二设备运作已经超负荷，第二设备则会停止接收该帧。
本发明实施例可以使得Wi-Fi接口能识别一个帧是否为WUR帧，从而能更充分利用WUR帧，提高空口效率，降低第二设备能耗。
如图4所示为现有WUR帧的一种可能的帧格式。当现有的Wi-Fi接收机，如802.11ax接收机，接收到如图4所示的WUR帧时，Wi-Fi接收机会根据传统802.11前导(Legacy 802.11Preamble)识别所述帧是一个802.11帧，并根据传统802.11前导完成AGC设置和符号同步等操作。Wi-Fi接收机会进一步根据传统802.11前导中的L-SIG域之后的一个或多个OFDM符号来判断所述帧是属于以下帧中的哪一类帧：802.11a帧，802.11n帧，802.11ac帧，或802.11ax帧。由于如图4所示帧为WUR帧，且传统802.11前导中的L-SIG域之后的一个或多个OFDM符号是唤醒前导的一部分，现有的Wi-Fi接收机不能正确判断所述帧的种类(802.11a帧，802.11n帧，802.11ac帧，或802.11ax帧)，现有的Wi-Fi接收机就会把所述帧当成802.11a的帧来接收和处理。Wi-Fi接收机按照802.11a的帧格式接收和处理所述帧，对所述帧进行帧校验时就会出错(即认为所述帧在传输过程中发生错误)，继而丢弃所述帧。由于传统的WUR帧的结构，使得Wi-Fi接收机在解析一个传统的WUR帧时，没办法识别该帧是一个WUR帧，会把该帧当成802.11a的帧来接收和处理，继而对该帧进行帧校验时出错，最后丢弃该帧，使得传统的WUR帧没有被充分利用，且浪费了接收者的Wi-Fi接收机的能耗。
本发明提供的实施例提供了能让Wi-Fi接收机识别WUR帧的技术方案，例如，可以在所述传统802.11前导中的L-SIG域和所述唤醒前导之间增加一个或多个OFDM符号来指示所述帧为WUR帧，以帮助Wi-Fi接收机识别所述帧为WUR帧，使能Wi-Fi接收机可以正确接收和处理WUR帧；或者，在Wi-Fi接收机识别一个帧的种类的操作中增加Wi-Fi接收机识别一个帧是否为WUR帧的操作。在一种实施例中，Wi-Fi接收机在接收一个帧时可以判断所述接收的帧属于以下帧中的哪一类帧：WUR帧，802.11a帧，802.11n帧，802.11ac帧，或802.11ax帧。在接收者的Wi-Fi接收机正确识别一个帧为WUR帧后，可以根据接收者的需求选择是否接收该WUR帧的剩余部分，使得WUR帧得到更多的利用。
可选的，在本发明的一个实施例中，在L-SIG域之后的至少一个OFDM符号，是唤醒前导域的一部分，唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容。
具体地，L-SIG域之后的N(1≤N≤3)个OFDM符号，是唤醒前导域最前面的N个符号。
在一个可能的实施例中，STA可通过L-SIG域的L-LENGTH的值对3取模，减少无关帧的处理。
具体地，对于一个802.11ax设备，当其Wi-Fi接收机接收到的该帧的L-SIG域里的L_LENGTH满足表1所示例条件时，该帧可能是：(1)802.11a帧，(2)802.11ax帧，或者是(3)WUR帧；而不可能是802.11n或802.11ac帧(因为对于符合802.11n或者802.11ac标准的Wi-Fi帧，该Wi-Fi帧的L-LENGTH的值对3取模的结果只能为“0”，不可能满足 表1所示例的条件)。
以下列举几种帧进行示例说明：
802.11a帧的L-SIG域里的L-LENGTH的值对3取模有三种结果，“0”，“1”，或“2”。802.11n和802.11ac帧的L-SIG域里的L-LENGTH的值对3取模结果是“0”。802.11ax帧的L-SIG域里的L-LENGTH的值对3取模有两个可能结果：“1”或“2”。
当STA的Wi-Fi接收机接收该帧，确定该帧的L-LENGTH满足“L-LENGTH mod 3＝0”时，STA的Wi-Fi接收机可以停止对该帧的接收和进一步的处理，或者把该帧当做其它类型的帧(如，802.11a、802.11n或者802.11ac)进行处理。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM，1≤N≤3，该N个OFDM符号为唤醒前导的一部分。N个OFDM符号用于指示该帧为WUR帧。
具体地，Wi-Fi接收机根据L-SIG域之后的N个OFDM，确定所接收该帧为WUR帧包括：
假设L-SIG域之后的N个OFDM符号的第一符号为X1、第二符号为X 2和第三个符号为X3。3个OFDM符号确定该帧为WUR帧的步骤可以如附图5所示，包括：
第一步：Wi-Fi接收机根据解码规则解析符号X1，该解码规则可以为“802.11ax PHY RL-SIG”，获得解码结果为比特序列，该比特序列的字符长度为24，并计算比特序列与L-SIG内容的差异，例如，可以计算二者的汉明距离(Hamming Distance)，计算得到比特序列与L-SIG内容的差异为D1。
若D1＝0，则确定接收的该帧为802.11ax帧，802.11ax继续处理接收的802.11ax帧。
若D1≠0，则Wi-Fi接收机根据解码规则解析两个符号(X2，X3)，该解码规则可以为“802.11ax PHY HE-SIG-A”，获得解码结果为比特序列，该比特序列的字符长度为52。
1)若该比特序列可以通过高效信令A(High efficiency signal A，HE-SIG-A)的循环冗余校验(Cyclic Redundancy Check，CRC)，并且该比特序列可以被Wi-Fi接收机识别，例如，Wi-Fi接收机识别该比特序列中的BSS color域是有效的、MCS index域是有效的和/或Tail域是有效的，则设置该比特序列与HE-SIG-A的差异为D2＝0，确定该帧为802.11ax帧，802.11ax继续处理接收的802.11ax帧。
2)若该比特序列不能通过HE-SIG-A的CRC校验，则设置该比特序列与HE-SIG-A的差异为D2＝52，执行第二步。
第二步：Wi-Fi接收机根据解码规则解析符号(X1，X2)，该解码规则可以为“802.11a MAC Service Field”，获得解码结果为比特序列，该比特序列的字符长度为16，并计算该比特序列与“802.11a MAC Service Field”内容的差异，例如，可以计算该比特序列与“802.11a MAC Service Field”内容的汉明距离(Hamming Distance)，记录两者的差异为D3。
若D3＝0，则判定该帧为802.11a帧，Wi-Fi接收机继续处理所接收的802.11a帧。
若D3≠0，执行第三步。
需要说明的是，Wi-Fi接收机执行第一步和第二步的次序不是固定的，可以是先执行第二步，再执行第一步，或者第一步和第二步同时执行。802.11ax执行第一步和第二步的先后次序不在此限定。
第三步：根据表1可知，L-LENGTH mod 3＝1时，该帧可能是AP发送的WUR Beacon 帧，也可能是STA发送给AP的WUR的唤醒帧。
Wi-Fi接收机根据解码规则解析(X1，X2，X3)，该解码规则可以为Wake-up Preamble，获得解码结果比特序列，该比特序列的字符长度为3，并计算比特序列与“Wake-up Preamble”前3个比特的差异，例如，可以计算二者的汉明距离(Hamming Distance)，计算得到该差异为D4。
若D4＝0，则判定该帧为WUR帧，执行第四步，处理WUR帧；或停止接收该WUR帧。
若D4≠0，Wi-Fi接收机可以停止接收和处理该帧，设置网络分配向量(Network Allocation Vector，NAV)，开始退避，退避时间可以为L-LENGTH指示的时间，例如，((8*(2^L-LENGTH))/R)秒，其中，对于802.11n、802.11ac,802.11ax，R为6Mbps，而对于802.11a，R为L-SIG域中的MCS index指定的数值，例如，11Mbps。
根据表1可知，L-LENGTH mod 3＝2时,该帧可能是一个AP发送给STA的WUR的唤醒帧。例如，AP可能通过OFDMA方式同时向多个STA的WUR发送的唤醒帧，Wi-Fi接收机按照OFDMA方式和“Wake-up Preamble”的调制和编码方式处理(X1，X2，X3)，例如，Wi-Fi接收机只处理与自己的WUR相关的OFDM子载波上的信息。802.11ax接收机获得(X1，X2，X3)解码结果比特序列，该比特序列的字符长度为3，并计算该比特序列与“Wake-up Preamble”前3个比特的差异，例如，可以计算二者的汉明距离，计算得到该差异为D5。
若D5＝0，则确定该帧为WUR帧，并执行第四步，处理WUR帧；或停止接收该WUR帧。
若D5≠0，Wi-Fi接收机可以停止接收和处理该帧，设置NAV，开始退避，退避时间可以为L-LENGTH指示的时间，例如，((8*(2^L-LENGTH))/R)秒，其中，对于802.11n、802.11ac,802.11ax，R为6Mbps，而对于802.11a，R为L-SIG域中的MCS index指定的数值，例如，11Mbps。
需要说明的是：Wi-Fi接收机执行第一步、第二步和第三步的次序不是固定的，可以是先执行第三步，再执行第二步或者第一步；或者，第一步、第二步和第三步同时执行。802.11ax执行第一步、第二步和第三步的先后次序不在此限定。
第四步：确定所接收的帧(实际上，只接收了该帧的一部分)是WUR帧，Wi-Fi接收机继续接收该帧(继续接收WUR帧的Payload部分)，并将该帧作为WUR帧来处理。
需要说明的是，L-SIG域之后的N个OFDM符号可以是1个、也可以是2个，或者是3个，上述描述只是针对三个OFDM符号确定该帧为WUR帧的过程。3个OFDM符号、2个OFDM符号或1个OFDM符号都是基于L-SIG域之后的OFDM符号指示确定该帧为WUR帧。
在一个可能的实施中，可根据L-SIG域里的L-LENGTH域指示WUR帧的帧类型。故在此不再单独对1个OFDM符号或2个OFDM符号进行论述。
本发明的一个实施例中，Wi-Fi接收机通过现有技术中的WUR帧的“Legacy 802.11Preamble”里的L-SIG域的L-LENGTH域和“Legacy 802.11Preamble”之后的3个OFDM符号来确定该帧为WUR帧。在本发明实施例中没有增加WUR帧的“Legacy 802.11Preamble”长度，不过Wi-Fi接收机需要通过穷举判断才能比较准确的识别该帧是不是一个WUR帧。 进一步的，Wi-Fi接收机可以通过L-SIG域的L_LENGTH域来识别WUR帧的帧类型。
可选的，在本发明的一个实施例中，所述至少一个OFDM符号，在L-SIG域和唤醒前导之间，如附图6b所示。
本发明实施例中，在一个传统的WUR帧中的“Legacy 802.11Preamble”(即，传统802.11前导)和“Wake-up Preamble”(即，唤醒前导)之间新加入了一个或多个域，所述一个或多个域可以称之为WUR SIG(W-SIG)域，或可以用其他称谓。所述W-SIG域可以是一个域，或可以包括多个域，所述W-SIG域可以由一个或多个OFDM符号组成。所述W-SIG域可用于指示该帧是否为WUR帧，如附图6b所示。所述W-SIG域携带的信息包括：用于指示所述帧是否为WUR帧的指示信息，进一步的，还可以包括其他信息。在一种可能的实施例中，所述W-SIG域可以是一种特定的域，该域本身可用于指示所述帧为WUR帧，即，如果该帧中存在所述W-SIG域，则该域的存在即可指示该帧为WUR帧。在另一种可能的实施例中，当该帧中的所述W-SIG域中的部分或全部比特位的值为某一预定的值的情况下，可以指示该帧为WUR帧。
具体地，Wi-Fi接收机在接收一个帧的过程中，可以根据L-SIG域之后的1个或N个(其中，N是正整数，N大于或等于2)OFDM符号(此处将所述1个或N个OFDM符号称之为符号X4)，判断该帧是否是WUR帧。若符号X4是W-SIG域，则确定该帧是WUR；若符号X4不是W-SIG域，Wi-Fi接收机可按照其它帧类型处理该帧，也可以对接收的帧不做任何处理。在此不做限定。
在一个可能的实施例中，W-SIG域的内容可携带多种信息。假设W-SIG域的内容定义为“L-SIG域和一个已知序列S异或(XOR)”，即W-SIG＝L-SIG XOR S，例如，S可以是一个长度为24，全“1”序列。
例如，W-SIG域的内容也可以指示WUR帧的调整和编码方式，以及WUR帧的长度等。802.11ax发射机传输W-SIG所使用的调制和编码方式可以与传输L-SIG所使用的调制和编码方式相同，这样可以简化Wi-Fi接收机或其他Wi-Fi接收机接收W-SIG域的处理。W-SIG的内容也可以与L-SIG的内容不同或者不相关，W-SIG域携带的内容可以包括但不限于以下内容的一种或多种：
在一个可能的实施例中，W-SIG域的内容包括WUR帧指示信息，则Wi-Fi接收机可以根据WUR帧指示信息来识别一个WUR帧，在确定该帧为WUR帧，则继续接收和处理WUR帧，可以简化Wi-Fi接收机识别WUR帧的操作。WUR帧指示信息，用于指示一个帧是WUR帧，可以为1个比特或多个比特。
在一个可能的实施例中，W-SIG域的内容包括WUR帧类型信息，则Wi-Fi接收机可以根据WUR帧类型信息确定该帧是AP-WUR唤醒帧，或是STA-WUR唤醒帧，或是WUR Beacon帧中的一种，继续接收和处理WUR帧，可以避免Wi-Fi接口接收和处理与自己无关的帧。WUR帧类型信息，用于指示WUR帧的类型信息，WUR帧类型信息可以为1个或多个比特，WUR帧类型可以是唤醒帧，或者是广播的WUR帧(如WUR Beacon)等。
在一个可能的实施例中，W-SIG域的内容包括AP的标识信息，则Wi-Fi接收机可以根据AP的标识信息判断WUR帧的目标接收者是否属于自己所在的基本服务集(Basic Service Set，BSS)，以方便Wi-Fi接收机过滤不属于自己所在的BSS的WUR帧，可以避 免Wi-Fi接收机接收和处理无关的帧。AP的标识信息包括，例如，AP的MAC地址或者压缩的MAC地址，或者AP的MAC地址的哈希值，或者AP的MAC地址的一部分。
在一个可能的实施例中，W-SIG域的内容包括AP所在的BSS的标识信息，则Wi-Fi接收机可以根据AP所在的BSS的标识信息判断WUR帧的目标接收者是否属于自己所在的BSS，以方便Wi-Fi接收机过滤不属于自己所在的BSS的WUR帧，可以避免Wi-Fi接收和处理与自己无关的帧。AP所在的BSS的标识信息包括，例如，基本服务集标识(Basic Service Set Identifier，BSSID)或者压缩的BSSID，或者BSSID的哈希值，或者BSSID的一部分，或者BSS color。
在一个可能的实施例中，W-SIG的内容包括WUR帧的目标接收STA的主通信接口(如Wi-Fi接口)的标识信息，则Wi-Fi接收机可以根据WUR帧的目标接收STA的主通信接口的标识信息来识别WUR帧的目标接收者，可以避免主通信接口接收和处理与自己无关的WUR帧，也可以避免多个STA重复发送AP-WUR唤醒帧。WUR帧的目标接收STA的主通信接口(如802.11ax接口，802.11ax接口属于Wi-Fi接口的一种)的标识信息包括，例如，STA的MAC地址或者压缩的MAC地址，或者STA的MAC地址的哈希值，或者STA的MAC地址的一部分，或者STA的关联标识符(Association Identifier，AID)，或者STA的部分关联标识符(Partial Association Identifier，PAID)信息。
在一个可能的实施例中，W-SIG域的内容包括WUR帧的目标接收STA的辅助唤醒接口(如WUR接口)的标识信息，则Wi-Fi接收机可以根据WUR帧的目标接收STA的辅助唤醒接口(如WUR接口)的标识信息来识别WUR帧的目标接收者，避免802.11ax接口接收和处理与自己无关的帧,也可以避免多个STA重复发送AP-WUR唤醒帧。WUR帧的目标接收STA的辅助唤醒接口(如WUR接口)的标识信息包括，例如，WUR接口的地址(WUR ID)或者压缩的WUR ID，或者WUR接口的地址的哈希值，或者WUR接口地址的一部分。
在一个可能的实施例中，W-SIG域的内容包括WUR频道信息，则Wi-Fi接收机可以根据WUR频道信息确定WUR帧后续部分(即OOK调制部分)的子频道，以方便Wi-Fi接收机对WUR帧后续部分(即OOK调制部分)的处理，例如，窄带滤波处理。WUR频道信息，可用于指示WUR帧使用的WUR工作频道。
在本发明的一个实施例中，通过在传统的WUR帧的“Legacy 802.11Preamble”和“Wake-up Preamble”之间新增加一个或多个OFDM符号，即W-SIG，来指示该帧是否是WUR帧，进一步地，还可以指示该帧是哪一种类型的WUR帧。
可选的，在本发明的另一个实施例中，所述至少一个OFDM符号，可以是WUR帧的一部分或者全部。在本发明实施例中，Wi-Fi接收机可以根据“Legacy 802.11Preamble”之后的N个OFDM符号(N个OFDM符号可以是“Wake-up Preamble”的一部分)来识别一个WUR帧，N大于或等于1。这里N的取值可以是“Wake-up Preamble”的长度M，即“Wake-up Preamble”包含的OOK或者OFDM符号数M，例如，M＝10；或者N可以比“Wake-up Preamble”的长度M小，例如，“Wake-up Preamble”的长度为M＝10,而N＝6。若通断键控(On-Off Keying，OOK)信号是由802.11ax发射机产生，则OOK符号也是OFDM符号。
Wi-Fi接收机在接收一个帧的过程中，根据L-SIG之后的N个OFDM符号来判断该帧是否是一个WUR帧，包括：
第一步：若L-SIG与之后的N个OFDM符号的内容指示该帧为802.11ax帧，则确定该帧是802.11ax帧。Wi-Fi接收机处理802.11ax帧。
若L-SIG域与之后的N个OFDM符号的内容指示该帧不是802.11ax帧，则确定该帧不是802.11ax帧，执行第二步。
第二步：若L-SIG域之后的N个OFDM符号的内容指示该帧为802.11a帧(或者为802.11n帧或者为802.11ac帧)，则确定该帧是802.11a帧(或者是802.11n帧或者是802.11ac帧)。Wi-Fi接收机处理802.11a或802.11n或802.11ac帧。
若L-SIG域之后的N个OFDM符号的内容指示该帧不是802.11a帧(或者为802.11n帧或者为802.11ac帧)，执行第三步。
需要说明的是，上述的步骤也可以是先执行第二步，再执行第一步；或者，同时执行第一步和第二步。上述执行步骤不在此限定。
第三步：若L-SIG域之后的N个OFDM符号的内容与“Wake-up Preamble”的前N个符号的内容一样，可以是“Wake-up Preamble”的前一部分内容，也可以是全部的内容，确定接收的帧是WUR帧，Wi-Fi接收机继续接收该帧(续接收该帧的Payload部分)。此处处理方式与上述实施例的第四步相同，为简洁描述，在此不再赘述。
若L-SIG域之后的N个OFDM符号的内容与“Wake-up Preamble”的前N个符号的内容不一样，按照其它帧类型处理该帧。
需要说明的是，Wi-Fi接收机执行第一步、第二步和第三步的次序不是固定的，可以是先执行第三步，再执行第二步或者第一步；或者，第一步、第二步和第三步同时执行。802.11ax执行第一步、第二步和第三步的先后次序不在此限定。
本发明实施例中，没有增加传统WUR帧的物理帧头的长度，但将传统WUR帧的功能进行了改进，利用了传统WUR帧的“Wake-up Preamble”中的一个或多个符号，使得接收方可以高效地识别一个帧是否为WUR帧。Wi-Fi接收机可以根据接收的“Wake-up Preamble”中的一个或多个符号，或“Wake-up Preamble”全部的内容，可以确定该帧是否为WUR帧，进一步地，还可以确定该帧是哪一种类型的WUR帧。
可选的，在本发明的一个实施例中，STA可以不通过L_LENGTH来识别WUR帧的帧类型，而是通过WUR帧的内容来识别WUR帧的帧类型。具体可参照本发明上述实施例，在L-SIG域和唤醒前导之间增加的至少一个OFDM，即W-SIG域。在一个可能的实施例中，可通过至少一个OFDM符号指示该帧是WUR帧。在一个可能的实施例中，在确定该帧是WUR帧后，可通过至少一个OFDM符号指示WUR帧的帧类型。
图7为本发明实施例提供的一种设备的结构示意图。该设备可用于实现前述各方法实施例中该帧的发送者AP所执行的方法。如图7所示，该设备可包括：处理模块710，用于生成一个帧，该帧包括第一部分和第二部分，该帧的第二部分位于第一部分之后，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示帧是否为WUR帧的指示信息；发送模块720，用于发送该帧。
在本发明实施例中，根据该帧的L-SIG域之后的至少一个OFDM符号,指示该帧为WUR帧。
在一个可能的实施例中，在帧为WUR帧的情况下，可通过L-SIG域里的L-LENGTH域指示WUR帧的帧类型。
在一个可能的实施例中，至少一个OFDM符号位于该帧的唤醒前导中，该帧中的唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数。
具体地，L-SIG域之后的至少一个OFDM符号是唤醒前导的一部分，Wi-Fi接收机需要接收完整“Wake-up Preamble”，进而准确判断该帧是不是WUR帧。同时，没有增加WUR帧的物理帧头的长度。
在一个可能的实施例中，至少一个OFDM符号位于L-SIG域与该帧的唤醒前导之间，该帧的第二部分包括唤醒前导。
具体地，在L-SIG域和“Wake-up Preamble”之间增加至少一个OFDM符号，简化了识别WUR帧的操作。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括如下信息中的至少一个：L-SIG的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在至少一个OFDM符号指示帧为WUR帧的情况下，至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示WUR帧的帧类型。
在一个可能的实施例中，WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括：帧的目标接收者的主通信接口的标识信息，或者，帧的目标接受者的辅助唤醒接口的标识信息。
在一个可能的实施例中，帧的第一部分包括传统802.11前导，帧的第二部分包括WUR载荷的部分或全部。
图8为本发明实施例提供的另一种设备的结构示意图。如图8所示，该设备包括处理器810、收发机820和存储器830等部件。
处理器810可由附图7中的处理模块710替换。处理器810用于生成一个帧，该帧包括第一部分和第二部分，该帧的第二部分位于第一部分之后，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示帧是否为WUR帧的指示信息；收发机820可由附图7中的发送模块720替换。收发机820用于发送该帧。
该设备还可以包括总线840。其中，处理器810、收发器820以及存储器830可以通过总线840相互连接；总线840可以是外设部件互连标准(Peripheral Component Interconnect，简称PCI)总线或扩展工业标准结构(Extended Industry Standard Architecture，简称EISA)总线等。所述总线840可以分为地址总线、数据总线、控制总线等。为便于表示，图8中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本发明实施例中，根据该帧的L-SIG域之后的至少一个OFDM符号,指示该帧为WUR帧。
在一个可能的实施例中，可通过L-SIG域L-LENGTH域指示WUR帧的帧类型。
在一个可能的实施例中，至少一个OFDM符号位于该帧的唤醒前导中，该帧中的唤醒前导的位置位于该帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为该帧中唤醒前导所包括的符号的个数。
具体地，L-SIG域之后的至少一个OFDM符号是唤醒前导的一部分，Wi-Fi接收机需要接收完整“Wake-up Preamble”，进而准确判断该帧是不是WUR帧。同时，没有增加该帧的物理帧头的长度。
在一个可能的实施例中，至少一个OFDM符号位于L-SIG域与该帧的唤醒前导之间，帧的第二部分包括唤醒前导。
具体地，在L-SIG域和“Wake-up Preamble”之间增加至少一个OFDM符号，简化了识别WUR帧的操作。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括如下信息中的至少一个：L-SIG的内容与一个已知比特序列的异或的结果、该帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在至少一个OFDM符号指示帧为WUR帧的情况下，至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示WUR帧的帧类型。
在一个可能的实施例中，WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括：帧的目标接收者的主通信接口的标识信息，或者，帧的目标接受者的辅助唤醒接口的标识信息。
在一个可能的实施例中，帧的第一部分包括传统802.11前导，帧的第二部分包括WUR载荷的部分或全部。
实际产品中，该设备可以由一个片上系统(System-on-a-chip，SoC)实现或者集成电路实现。
图9为本发明实施例提供的另一种设备的结构示意图，该设备可用于实现前述各方法实施例中该帧的接收者STA所执行的方法。如图9所示，该设备包括：主通信模块910，用于接收一个帧的第一部分，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示该帧是否为WUR帧的指示信息；处理模块920，用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据所述至少一个OFDM符号携带的信息确定是否通过所述主通信模块910继续接收该帧的第二部分。该帧的第二部分位于第一部分之后。所述处理模块920可以是所述主通信模块910内的一个组件，如微处理器；或，所述处理模块920可以由多个组件组成，例如，可以包括一个微处理器和一个处理器(如CPU)，所述微处理器或处理器可以独立于所述处理模块920之外，或，所述微处理器或处理器可以集成在所述处理模块920中，所述微处理器和处理器可以分别执行一些处理操作，来实现上述处理模块920所执行的功能。
在本发明实施例中，根据主通信模块910接收的该帧的第一部分，该第一部分的L-SIG 域之后的至少一个OFDM符号携带的信息包括：用于指示该帧是否为WUR帧的指示信息，在处理模块920根据至少一个OFDM符号确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号确定是否通过主通信模块910继续接收该帧的第二部分。
在一个可能的实施例中，在该帧为WUR帧的情况下，第一部分包括该帧中的L-SIG域，L-SIG域包括L-LENGTH域，L-LENGTH域用于指示WUR帧的帧类型。
具体地，在确定该帧为WUR帧之后，还可通过该帧中的L-SIG域里的L-LENGTH域指示该帧的帧类型。
在一个可能的实施例中，处理模块920用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号携带的信息确定是否通过主通信模块910继续接收帧的第二部分包括：若至少一个OFDM符号指示该帧为WUR帧，且该帧的类型为WUR帧的帧类型，则处理模块920确定通过主通信模块910继续接收帧的第二部分。
在一个可能的实施例中，处理模块920用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号携带的信息确定是否通过主通信模块910继续接收该帧的第二部分包括：若至少一个OFDM符号指示该帧为WUR帧，且L-LENGTH域指示的WUR帧的帧类型不符合设备的需求，则主通信模块910确定停止接收该帧。
在一个可能的实施例中，至少一个OFDM符号位于该帧中第二部分包括的唤醒前导中，该帧中的唤醒前导的位置位于帧中的L-SIG域之后，该帧的第二部分包括唤醒前导中至少一个OFDM符号之后的内容。也就是说至少一个OFDM符号位于L-SIG域之后。
在一个可能的实施例中，至少一个OFDM符号为N个OFDM符号，1≤N≤M，其中M为帧中唤醒前导所包括的符号的个数。
具体地，L-SIG域之后的至少一个OFDM符号是唤醒前导的一部分，Wi-Fi接收机需要接收完整“Wake-up Preamble”，进而准确判断该帧是不是WUR帧。同时，没有增加帧的物理帧头的长度。
在一个可能的实施例中，至少一个OFDM符号位于L-SIG域与该帧的唤醒前导之间。
具体地，在L-SIG域和“Wake-up Preamble”之间增加至少一个OFDM符号，简化了识别WUR帧的操作。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括如下信息中的至少一个：L-SIG内容与一个已知比特序列的异或的结果、帧的调制和编码方式，或该帧的长度。
在一个可能的实施例中，在至少一个OFDM符号指示帧为WUR帧的情况下，至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示WUR帧的帧类型。
在一个可能的实施例中，至少一个OFDM符号携带的信息还包括：帧的目标接收者的主通信接口的标识信息，或者，帧的目标接收帧的辅助唤醒接口的标识信息。
在一个可能的实施例中，该帧的第一部分为传统802.11前导，该帧的第二部分为WUR载荷的部分或全部。
图10为本发明实施例提供的另一种设备的结构示意图。如图10所示，该设备包括第一收发机1010、处理器1030、存储器1040和天线1050。
其中，第一收发机1010，是主通信接口(如，Wi-Fi接口)的一个具体的描述，可由主通信模块(例如，802.11通信模块)提供，第一收发机1010可用于发送和接收消息(包括接收第一设备发送的一个帧)；可由附图9中的主通信模块910替换。第一收发机1010用于接收该帧的第一部分，第一部分包括L-SIG域和位于L-SIG域之后的至少一个OFDM符号，至少一个OFDM符号携带的信息包括：用于指示一个帧是否为WUR帧的指示信息；处理器1030可由附图9中的处理模块920替换，处理器1030用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号携带的信息确定是否通过第一收发机1010继续接收该帧的第二部分。该帧的第二部分位于第一部分之后。
在一个可能的实施例中，处理器1030用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号携带的信息确定是否通过第一收发机1010继续接收帧的第二部分包括：若至少一个OFDM符号指示该帧为WUR帧，且该帧的类型为WUR帧的帧类型，则处理器1030确定通过第一收发机1010继续接收帧的第二部分。
在一个可能的实施例中，处理器1030用于根据至少一个OFDM符号确定该帧是否为WUR帧，在确定该帧为WUR帧的情况下，至少根据至少一个OFDM符号携带的信息确定是否通过第一收发机1010继续接收该帧的第二部分包括：若至少一个OFDM符号指示该帧为WUR帧，且L-LENGTH域指示的WUR帧的帧类型不符合设备的需求，则第一收发机1010确定停止接收该帧。
在一个可能的实施例中，第二设备还包括第二接收机1020，第二接收机1020是辅助通信接口的一个具体的描述，可由辅助唤醒模块提供，第二接收机1020可用于接收唤醒设备发送的唤醒帧，并在接收到唤醒帧之后向第一收发机1010发送唤醒信号，以唤醒第一收发机1010。
存储器1040的数量不限制为一个；存储器1040和处理器1030可以为第一收发机1010和第二接收机1020共享。
第一收发机1010和第二接收机1020可以共享同一根天线1050，共享同一根天线1050主要出于降低设备硬件成本和实现简单。但是当第一收发机1010和第二接收机1020工作在不同的频段上时，需要采用不同的天线，满足实际工作的需求。
实际产品中，该设备可以由一个片上系统(System-on-a-chip，SoC)实现或者集成电路实现。
本发明提供的各实施例能够让STA通过802.11接口接收WUR帧，充分利用WUR帧，提高空口效率，降低设备能耗，具体的技术效果可以包括以下的一种或多种：
未关联的STA可以通过802.11接口接收AP发送的WUR Beacon帧，从而发现AP并获得与AP相关的信息。这样可以减少未关联的STA发现AP的时间，降低STA关联延迟。
已经关联的STA可以通过Wi-Fi接口接收AP发送的WUR Beacon帧，进行时间同步。WUR Beacon帧得到充分利用，空口效率提高，系统能耗降低。
已经关联的STA可以通过Wi-Fi接口接收AP发送的STA-WUR唤醒帧，及时响应AP，降低数据传输延迟。
已经关联的STA可以通过Wi-Fi接口串听其它STA发送给AP-WUR的唤醒帧，避免 重复发送AP-WUR唤醒帧，减少STA能量消耗，提高空口效率，降低所述STA暴露隐私的可能。
专业人员应该还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令处理器完成，所述的程序可以存储于计算机可读存储介质中，所述的存储介质是非短暂性(non-trans itory)介质，例如随机存取存储器，只读存储器，快闪存储器，硬盘，固态硬盘，磁带(magnetic tape)，软盘(floppy disk)，光盘(optical disc)及其任意组合。
本发明各方法实施例之间相关部分可以相互参考；各装置实施例所提供的装置用于执行对应的方法实施例所提供的方法，故各装置实施例可以参考相关的方法实施例中的相关部分进行理解。
本发明各实施例中提供的消息/帧、模块或单元的名称仅为示例，可以使用其他名称，只要消息/帧、模块或单元的作用相同即可。
以上，仅为本申请较佳的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应该以权利要求的保护范围为准。

Claims (55)

  1. 一种接收WUR帧的方法，其特征在于，所述方法包括：
    设备通过所述设备的主通信模块接收一个帧的第一部分，所述第一部分包括L-SIG域和位于所述L-SIG域之后的至少一个OFDM符号，所述至少一个OFDM符号携带的信息包括：用于指示所述帧是否为WUR帧的指示信息；
    若所述至少一个OFDM符号指示所述帧为WUR帧，则所述设备至少根据所述至少一个OFDM符号携带的信息确定是否通过所述设备的主通信模块继续接收所述帧的第二部分，所述帧的第二部分位于所述第一部分之后。
  2. 根据权利要求1所述的方法，其特征在于，所述L-SIG域包括L-LENGTH域，在所述帧为WUR帧的情况下，所述L-LENGTH域用于指示所述WUR帧的帧类型。
  3. 根据权利要求2所述的方法，其特征在于，所述若所述至少一个OFDM符号指示所述帧为WUR帧，则所述设备至少根据所述至少一个OFDM符号携带的信息确定是否通过所述设备的主通信模块继续接收所述帧的第二部分，包括：
    若所述至少一个OFDM符号指示所述帧为WUR帧，且所述L-LENGTH域指示的所述WUR帧的帧类型符合所述设备的需求，则所述设备通过所述设备的主通信模块继续接收所述帧的第二部分。
  4. 根据权利要求2所述的方法，其特征在于，所述若所述至少一个OFDM符号指示所述帧为WUR帧，则所述设备至少根据所述至少一个OFDM符号携带的信息确定是否通过所述设备的主通信模块继续接收所述帧的第二部分，包括：
    若所述至少一个OFDM符号指示所述帧为WUR帧，且所述L-LENGTH域指示的所述WUR帧的帧类型不符合所述设备的需求，则所述设备停止接收所述帧。
  5. 根据权利要求1至4任一项所述的方法，其特征在于，所述至少一个OFDM符号位于所述帧中的唤醒前导中，所述帧中的唤醒前导的位置位于所述帧中的所述L-SIG域之后，所述帧的第二部分包括所述唤醒前导中所述至少一个OFDM符号之后的内容。
  6. 根据权利要求5所述的方法，其特征在于，所述至少一个OFDM符号为N个OFDM符号，所述1≤N≤M，其中M为所述帧中唤醒前导所包括的符号的个数。
  7. 根据权利要求1至4任一项所述的方法，其特征在于，所述至少一个OFDM符号位于所述L-SIG域与所述帧的唤醒前导之间，所述帧的第二部分包括所述唤醒前导。
  8. 根据权利要求1至7任一项所述的方法，其特征在于，所述至少一个OFDM符号携带的信息还包括如下信息中的至少一个：所述L-SIG的内容与一个已知比特序列的异或的结果、所述帧的调制和编码方式，或所述帧的长度。
  9. 根据权利要求1至8任一项所述的方法，其特征在于，在所述至少一个OFDM符号指示所述帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示所述WUR帧的帧类型。
  10. 根据权利要求1至9任一所述的方法，其特征在于，所述WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
  11. 根据要求1至10任一项所述的方法，其特征在于，所述至少一个OFDM符号携带的信息还包括：所述帧的目标接收者的主通信接口的标识信息，或者，所述帧的目标接 收者的辅助唤醒接口的标识信息。
  12. 根据要求1至11任一项所述的方法，其特征在于，所述帧的第一部分包括传统802.11前导，所述帧的第二部分包括WUR载荷的部分或全部。
  13. 一种发送WUR帧的方法，其特征在于，所述方法包括：
    生成一个帧，所述帧包括第一部分和第二部分，所述帧的第二部分位于所述第一部分之后，所述第一部分包括L-SIG域和位于所述L-SIG域之后的至少一个OFDM符号，所述至少一个OFDM符号携带的信息包括：用于指示所述帧是否为WUR帧的指示信息；
    发送所述帧。
  14. 根据权利要求13所述的方法，其特征在于，所述L-SIG域包括L-LENGTH域，在所述帧为WUR帧的情况下，所述L-LENGTH域用于指示所述WUR帧的帧类型。
  15. 根据权利要求13或14所述的方法，其特征在于，所述至少一个OFDM符号位于所述帧中的唤醒前导中，所述帧中的唤醒前导的位置位于所述帧中的所述L-SIG域之后，所述帧的第二部分包括所述唤醒前导中所述至少一个OFDM符号之后的内容。
  16. 根据权利要求15所述的方法，其特征在于，所述至少一个OFDM符号为N个OFDM符号，所述1≤N≤M，其中M为所述帧中唤醒前导所包括的符号的个数。
  17. 根据权利要求13或14所述的方法，其特征在于，所述至少一个OFDM符号位于所述L-SIG域与所述帧的唤醒前导之间，所述帧的第二部分包括所述唤醒前导。
  18. 根据权利要求13至17任一项所述的方法，其特征在于，所述至少一个OFDM符号携带的信息还包括如下信息中的至少一个：所述L-SIG的内容与一个已知比特序列的异或的结果、所述帧的调制和编码方式，或所述帧的长度。
  19. 根据权利要求13至18任一项所述的方法，其特征在于，在所述至少一个OFDM符号指示所述帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示所述WUR帧的帧类型。
  20. 根据权利要求13至19任一所述的方法，其特征在于，所述WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
  21. 根据权利要求13至20任一项所述的方法，其特征在于，所述至少一个OFDM符号携带的信息还包括：所述帧的目标接收者的主通信接口的标识信息，或者，所述帧的目标接收者的辅助唤醒接口的标识信息。
  22. 根据权利要求13至21任一项所述的方法，其特征在于，所述帧的第一部分包括传统802.11前导，所述帧的第二部分包括WUR载荷的部分或全部。
  23. 一种设备，其特征在于，所述设备包括：
    主通信模块，用于接收一个帧的第一部分，所述第一部分包括L-SIG域和位于所述L-SIG域之后的至少一个OFDM符号，所述至少一个OFDM符号携带的信息包括：用于指示所述帧是否为WUR帧的指示信息；
    处理模块，用于根据所述至少一个OFDM符号确定所述帧是否为WUR帧，在确定所述帧为WUR帧的情况下，至少根据所述至少一个OFDM符号携带的信息确定是否通过所 述主通信模块继续接收所述帧的第二部分，所述帧的第二部分位于所述第一部分之后。
  24. 根据权利要求23所述的设备，其特征在于，所述L-SIG域包括L-LENGTH域，在所述帧为WUR帧的情况下，所述L-LENGTH域用于指示所述WUR帧的帧类型。
  25. 根据权利要求24所述的设备，其特征在于，所述处理模块用于根据所述至少一个OFDM符号确定所述帧是否为WUR帧，在确定所述帧为WUR帧的情况下，至少根据所述至少一个OFDM符号携带的信息确定是否通过所述主通信模块继续接收所述帧的第二部分包括：
    若所述至少一个OFDM符号指示所述帧为WUR帧，且所述帧的类型为所述WUR帧的帧类型，则所述处理模块确定通过所述主通信模块继续接收所述帧的第二部分。
  26. 根据权利要求24所述的设备，其特征在于，所述处理模块用于根据所述至少一个OFDM符号确定所述帧是否为WUR帧，在确定所述帧为WUR帧的情况下，至少根据所述至少一个OFDM符号携带的信息确定是否通过所述主通信模块继续接收所述帧的第二部分包括：
    若所述至少一个OFDM符号指示所述帧为WUR帧，且所述L-LENGTH域指示的所述WUR帧的帧类型不符合所述设备的需求，则所述处理模块确定停止接收所述帧。
  27. 根据权利要求23至26任一项所述的设备，其特征在于，所述至少一个OFDM符号位于所述帧的唤醒前导中，所述帧中的唤醒前导的位置位于所述帧中的L-SIG域之后，所述帧的第二部分包括所述唤醒前导中所述至少一个OFDM符号之后的内容。
  28. 根据权利要求27所述的设备，其特征在于，所述至少一个OFDM符号为N个OFDM符号，所述1≤N≤M，其中M为所述帧中唤醒前导所包括的符号的个数。
  29. 根据权利要求23至26任一项所述的设备，其特征在于，所述至少一个OFDM符号位于所述L-SIG域与所述帧的唤醒前导之间，所述帧的第二部分包括所述唤醒前导。
  30. 根据权利要求23至29任一项所述的设备，其特征在于，所述至少一个OFDM符号携带的信息还包括如下信息中的至少一个：所述L-SIG内容与一个已知比特序列的异或的结果、所述帧的调制和编码方式，或所述帧的长度。
  31. 根据权利要求23至30任一项所述的设备，其特征在于，在所述至少一个OFDM符号指示所述帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示所述WUR帧的帧类型。
  32. 根据权利要求23至31任一所述的设备，其特征在于，所述WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
  33. 根据权利要求23至32任一项所述的设备，其特征在于，所述至少一个OFDM符号携带的信息还包括：所述帧的目标接收者的主通信接口的标识信息，或者，所述帧的目标接收者的辅助唤醒接口的标识信息。
  34. 根据权利要求23至33任一项所述的设备，其特征在于，所述帧的第一部分包括传统802.11前导，所述帧的第二部分包括WUR载荷的部分或全部。
  35. 一种设备，其特征在于，所述设备包括：
    处理模块，用于生成一个帧，所述帧包括第一部分和第二部分，所述帧的第二部分位 于所述第一部分之后，所述第一部分包括L-SIG域和位于所述L-SIG域之后的至少一个OFDM符号，所述至少一个OFDM符号携带的信息包括：用于指示所述帧是否为WUR帧的指示信息；
    发送模块，用于发送所述帧。
  36. 根据权利要求35所述的设备，其特征在于，所述L-SIG域包括L-LENGTH域，在所述帧为WUR帧的情况下，所述L-LENGTH域用于指示所述WUR帧的帧类型。
  37. 根据权利要求35或36所述的设备，其特征在于，所述至少一个OFDM符号位于所述帧的唤醒前导中，所述帧中的唤醒前导的位置位于所述帧中的所述L-SIG域之后，所述帧的第二部分包括所述唤醒前导中所述至少一个OFDM符号之后的内容。
  38. 根据权利要求37所述的设备，其特征在于，所述至少一个OFDM符号为N个OFDM符号，所述1≤N≤M，其中M为所述帧中唤醒前导所包括的符号的个数。
  39. 根据权利要求35或36所述的设备，其特征在于，所述至少一个OFDM符号位于所述L-SIG域与所述帧的唤醒前导之间，所述帧的第二部分包括所述唤醒前导。
  40. 根据权利要求35至39任一项所述的设备，其特征在于，所述至少一个OFDM符号携带的信息还包括如下信息中的至少一个：所述L-SIG的内容与一个已知比特序列的异或的结果、所述帧的调制和编码方式，或,所述帧的长度。
  41. 根据权利要求35至40任一项所述的设备，其特征在于，在所述至少一个OFDM符号指示所述帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示所述WUR帧的帧类型。
  42. 根据权利要求35至41任一所述的设备，其特征在于，所述WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
  43. 根据权利要求35至42任一项所述的设备，其特征在于，所述至少一个OFDM符号携带的信息还包括：所述帧的目标接收者的主通信接口的标识信息，或者，所述帧的目标接受者的辅助唤醒接口的标识信息。
  44. 根据权利要求35至43任一项所述的设备，其特征在于，所述帧的第一部分包括传统802.11前导，所述帧的第二部分包括WUR载荷的部分或全部。
  45. 一种WUR帧，其特征在于，所述WUR帧包括：
    第一部分，所述第一部分包括L-SIG域和位于所述L-SIG域之后的至少一个OFDM符号，所述至少一个OFDM符号携带的信息包括：用于指示所述帧为WUR帧的指示信息；
    第二部分，所述帧的第二部分位于所述第一部分之后。
  46. 根据权利要求45所述的WUR帧，其特征在于，所述L-SIG域包括L-LENGTH域，在所述帧为WUR帧的情况下，所述L-LENGTH域用于指示所述WUR帧的帧类型。
  47. 根据权利要求45或46所述的WUR帧，其特征在于，所述至少一个OFDM符号位于所述帧中的唤醒前导中，所述帧中的唤醒前导的位置位于所述帧中的所述L-SIG域之后，所述帧的第二部分包括所述唤醒前导中所述至少一个OFDM符号之后的内容。
  48. 根据权利要求47所述的WUR帧，其特征在于，所述至少一个OFDM符号为N个OFDM符号，所述1≤N≤M，其中M为所述帧中唤醒前导所包括的符号的个数。
  49. 根据权利要求45或46所述的WUR帧，其特征在于，所述至少一个OFDM符号位于所述L-SIG域与所述帧的唤醒前导之间，所述帧的第二部分包括所述唤醒前导。
  50. 根据权利要求45至49任一所述的WUR帧，其特征在于，所述至少一个OFDM符号携带的信息还包括如下信息中的至少一个：所述L-SIG的内容与一个已知比特序列的异或的结果、所述帧的调制和编码方式，或所述帧的长度。
  51. 根据权利要求45至50任一所述的WUR帧，其特征在于，在所述至少一个OFDM符号指示所述帧为WUR帧的情况下，所述至少一个OFDM符号携带的信息还包括帧类型的指示信息，用于指示所述WUR帧的帧类型。
  52. 根据权利要求45至51任一所述的WUR帧，其特征在于，所述WUR帧的帧类型为以下中的一个：AP发送给STA的唤醒帧，AP发送给STA的唤醒无线电信标帧，或者，STA发送给AP的唤醒帧。
  53. 根据要求45至52任一项所述的WUR帧，其特征在于，所述至少一个OFDM符号携带的信息还包括：所述帧的目标接收者的主通信接口的标识信息，或者，所述帧的目标接收者的辅助唤醒接口的标识信息。
  54. 根据要求45至53任一项所述的WUR帧，其特征在于，所述帧的第一部分包括传统802.11前导，所述帧的第二部分包括WUR载荷的部分或全部。
  55. 根据要求54所述的WUR帧，其特征在于，所述传统802.11前导包括L-STF域、L-LTF域和所述L-SIG域，所述WUR载荷包括所述唤醒前导、MAC头域、帧实体域和FCS域，所述帧的第二部分包括所述唤醒前导的部分或全部、所述MAC头域、所述帧实体域和所述FCS域。
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WO2024022276A1 (zh) * 2022-07-28 2024-02-01 维沃移动通信有限公司 低功耗信号传输方法、装置、终端及通信设备
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