CN108430096B - Communication method, communication device and communication equipment of wireless local area network - Google Patents

Communication method, communication device and communication equipment of wireless local area network Download PDF

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CN108430096B
CN108430096B CN201710078989.1A CN201710078989A CN108430096B CN 108430096 B CN108430096 B CN 108430096B CN 201710078989 A CN201710078989 A CN 201710078989A CN 108430096 B CN108430096 B CN 108430096B
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frame
wakeup
duration
message
value
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CN108430096A (en
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董贤东
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Meizu Technology Co Ltd
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Meizu Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • 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
    • 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

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

Abstract

The invention provides a communication method, a communication device and communication equipment of a wireless local area network, wherein the communication method of the wireless local area network comprises the following steps: receiving a message frame; when the message frame comes from other BSSs, judging whether the message frame is a wakeup frame, wherein the wakeup frame is used for waking up the equipment of which the main communication interface is in the dormant state to enter the wakeup state so as to receive the cached downlink data frame; and when the message frame is judged to be the wake-up frame and the RSSI value of the wake-up frame is smaller than the set OBSS _ PD value, updating the current NAV value to the preset value in the Duration field of the MAC frame header of the wake-up frame. Through the technical scheme of the invention, the WUR and the IEEE802.11ax can be compatible, the subsequent communication of a sender and a receiver of the awakening frame is prevented from being interfered, the requirement of the WUR is met, the equipment is more power-saving, and the effective setting of the NAV value in the awakening frame is realized.

Description

Communication method, communication device and communication equipment of wireless local area network
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communication method of a wireless local area network, a communication apparatus of the wireless local area network, and a communication device.
Background
In 2016, 7 months, 802.11 has established a research group wur (wake Up receiver) of a next-generation Wi-Fi (Wireless Fidelity) technology, which is mainly applied to the aspect of internet of things and aims to save the power consumption of equipment as much as possible.
In the discussion of SG (Study Group), it is proposed that the WUR frame is a control signaling frame, and the WUR (802.11ba) function needs to be compatible with 802.11ax, while in 802.11ax the following provisions are made for SR (Spatial Reuse):
if a sta (station) in an OBSS (Overlapping basic Service Set) receives data and does not transmit it in its own BSS (basic Service Set), if its Received Power value (i.e., RSSI (Received Signal Strength Indication) value) is smaller than an OBSS Power Density (Overlapping basic Service Set) value, the sta will not update its NAV (Network Allocation Vector) value, considering that the WUR function needs to be compatible with 802.11ax, and the wake-up frame has very small transmit Power, much smaller than the transmit Power of the communication data frame, possibly its Received Power value is much lower than the Set NAV _ PD value, and if the sta does not update its own wake-up value, the communication will interfere with the original transmit Power of the communication data frame and the next communication of the sender, therefore, in order to avoid interference on its subsequent communication, its NAV update mechanism needs to be adjusted, and the duration of NAV setting needs to be defined in the wake-up frame.
Disclosure of Invention
Based on at least one of the above technical problems, the present invention provides a new communication scheme for a wireless local area network, so that a WUR (802.11ba) is compatible with ieee802.11ax, interference on subsequent communications of a sender and a receiver of a wakeup frame is avoided, the requirement of the WUR is met, a device is more power-saving, and an effective setting of a NAV value is realized in the wakeup frame.
In view of the above, according to a first aspect of the present invention, a communication method of a wireless local area network is provided, including: receiving a message frame; when the message frame comes from other BSSs, judging whether the message frame is a wakeup frame, wherein the wakeup frame is used for waking up the equipment with the main communication interface in the sleep state to enter the wakeup state so as to receive the cached downlink data frame; and when the message frame is judged to be the awakening frame and the RSSI value of the awakening frame is smaller than the set OBSS _ PD value, updating the current NAV value to the preset value in the Duration field of the MAC frame header of the awakening frame.
In the technical scheme, when an STA in an OBSS receives a message frame sent by other BSSs except the BSS where the STA is located, it needs to determine whether the message frame is a wakeup frame, and if the message frame is the wakeup frame and the RSSI value of the wakeup frame meets the condition that the RSSI value of the wakeup frame is smaller than the set OBSS _ PD value, the STA needs to update its current NAV value, and update the current NAV value by using a preset value in a Duration field of a MAC (Media Access Control) header of the wakeup frame during updating, so as to ensure that the STA does not Access a channel, so that the WUR is compatible with ieee802.11ax, thereby avoiding interference with subsequent communication between a sender and a receiver of the wakeup frame, meeting the requirement of the WUR, saving power of equipment, and simultaneously, achieving effective setting of the NAV value in the wakeup frame.
Further, in the above technical solution, preferably, different preset values of NAV may be set in the Duration field of the MAC frame header according to different transmission modes of the wakeup frame, so as to adapt to updating of NAV values of multiple usage scenarios, specifically:
in a first mode, when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values are: the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS. In the technical solution, when the wakeup frame is transmitted in the form of a pair of multicast message frames or a pair of all broadcast message frames, the preset value of NAV in Duration field of the MAC frame header may be set according to the above combination.
In a second mode, when the wake-up frame is a unicast message frame, whether a subsequently received data frame adopts an OFDMA form is judged;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames;
if not, the preset values are as follows: the sum of the time length of one wakeup frame, the time length of one wakeup response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS.
In the technical solution, when the wakeup frame is transmitted in the form of a one-to-one unicast message frame, the preset value of NAV in Duration field of the MAC frame header may be further set according to the corresponding combination according to a determination result of whether the data frame received after the device wakes up adopts an OFDMA (Orthogonal Frequency Division Multiple Access) format.
Wherein, the ACK (Acknowledgement) Frame is used to confirm that the sent data Frame has been received correctly, the trigger Frame is used to allocate spectrum resources for the PS-Poll (Power Save-Poll) Frame and the downlink data Frame, and the SIFS (Short Inter-Frame Space) is the Short interframe Space between two adjacent frames.
In any of the above technical solutions, preferably, the step of determining whether the message frame is a wakeup frame specifically includes: analyzing the indication information in the MAC frame header of the message frame to judge whether the message frame is a wakeup frame according to the indication information; and after the step of receiving the message frame and before the step of judging whether the message frame is a wakeup frame, the method further comprises the following steps: and determining whether the message frame is from other BSSs according to the BSS color value of the signal field of the message frame.
In the technical scheme, when the STA receives a message frame, it may specifically determine whether the message frame is a wakeup frame by analyzing whether the MAC frame header of the message frame has indication information for determining that the message frame is a wakeup frame, and if the MAC frame header of the message frame has corresponding indication information, it is determined as a wakeup frame, otherwise, it is a normal data frame, where the sending power of the wakeup frame is much lower than that of the normal data frame.
In addition, whether the message frame is from other BSSs can be determined according to the BSS color value of the signal field of the message frame, where the BSS color value represents an identifier of a base station and is used for distinguishing data of the BSS from data of other BSSs.
According to the second aspect of the present invention, there is also provided a communication method for a wireless local area network, including: generating a wake-up frame, wherein the wake-up frame is used for waking up a device of which a main communication interface is in a dormant state to enter a wake-up state so as to receive a cached downlink data frame; configuring the RSSI value of the wake-up frame to be smaller than the set OBSS _ PD value, and configuring a NAV value in a Duration field of a MAC frame header of the wake-up frame; and sending the wake-up frame.
In the technical scheme, the RSSI value of the awakening frame is configured to be smaller than the set OBSS _ PD value when the awakening frame is generated, so that an STA receiving the awakening frame can update the NAV value of the STA in time, and the NAV value is pre-configured in the Duration field of the MAC frame header of the awakening frame to ensure that the STA cannot be accessed into a channel, so that the WUR and the IEEE802.11ax can be compatible, the subsequent communication between a sender and a receiver of the awakening frame is prevented from being interfered, the requirement of the WUR is met, the equipment is more power-saving, and meanwhile, the effective setting of the NAV value is realized in the awakening frame.
According to the third aspect of the present invention, there is further provided a communication apparatus for a wireless local area network, including: a receiving unit for receiving a message frame; a judging unit, configured to judge whether the message frame received by the receiving unit is a wakeup frame when the message frame is from another BSS, where the wakeup frame is used to wake up a device in a sleep state of a main communication interface to enter a wakeup state to receive a cached downlink data frame; and the updating unit is used for updating the current NAV value to the preset value in the Duration field of the MAC frame header of the awakening frame when the judging unit judges that the message frame is the awakening frame and the RSSI value of the awakening frame is smaller than the set OBSS _ PD value.
In the technical scheme, when an STA in an OBSS receives a message frame sent by other BSSs except the BSS where the STA is located, it needs to determine whether the message frame is a wakeup frame, if so, and the RSSI value of the wakeup frame meets the condition that the RSSI value of the wakeup frame is smaller than the set OBSS _ PD value, the STA needs to update its current NAV value, and update the current NAV value by using the preset value of the Duration field of the MAC header of the wakeup frame during updating, so as to ensure that the STA does not access the channel, so that the WUR is compatible with ieee802.11ax, thereby avoiding interference with subsequent communication between a sender and a receiver of the wakeup frame, meeting the requirement of the WUR, making the device more power-saving, and simultaneously, effectively setting the NAV value in the wakeup frame.
Further, in the above technical solution, preferably, different preset values of NAV may be set in the Duration field of the MAC frame header according to different transmission modes of the wakeup frame, so as to adapt to updating of NAV values of multiple usage scenarios, specifically:
in a first mode, when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values are: the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS. In the technical solution, when the wakeup frame is transmitted in the form of a pair of multicast message frames or a pair of all broadcast message frames, the preset value of NAV in Duration field of the MAC frame header may be set according to the above combination.
In a second mode, when the wake-up frame is a unicast message frame, whether a subsequently received data frame adopts an OFDMA form is judged;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames;
if not, the preset values are as follows: the sum of the time length of one wakeup frame, the time length of one wakeup response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS.
In the technical solution, when the wakeup frame is transmitted in the form of a one-to-one unicast message frame, the preset value of NAV in the Duration field of the MAC frame header of the device may be further set according to the corresponding combination according to the result of the determination of whether the data frame received after the device wakes up adopts the OFDMA format.
The ACK frame is used to confirm that the sent data frame has been received without error, the trigger frame is used to allocate spectrum resources for the PS-Poll frame and the downlink data frame, and the SIFS is a short interframe space between two adjacent frames.
In any one of the above technical solutions, preferably, the determining unit specifically includes: the message frame comprises an analysis subunit and a judgment subunit, wherein the analysis subunit is used for analyzing the indication information in the MAC frame header of the message frame, and the judgment subunit is used for judging whether the message frame is a wakeup frame according to the indication information analyzed by the analysis subunit; and the communication device of the wireless local area network further comprises: and the determining unit is used for determining whether the message frame is from other BSSs according to the BSS color value of the signal field of the message frame after the receiving unit receives the message frame and before the judging unit judges whether the message frame is the wakeup frame.
In the technical scheme, when the STA receives a message frame, it may specifically determine whether the message frame is a wakeup frame by analyzing whether the MAC frame header of the message frame has indication information for determining that the message frame is a wakeup frame, and if the MAC frame header of the message frame has corresponding indication information, it is determined as a wakeup frame, otherwise, it is a normal data frame, where the sending power of the wakeup frame is much lower than that of the normal data frame.
In addition, whether the message frame is from other BSSs can be determined according to the BSS color value of the signal field of the message frame, where the BSS color value represents an identifier of a base station and is used for distinguishing data of the BSS from data of other BSSs.
According to the fourth aspect of the present invention, there is also provided a communication apparatus for a wireless local area network, including: a generating unit, configured to generate a wake-up frame, where the wake-up frame is used to wake up a device in a sleep state of a main communication interface to enter a wake-up state to receive a buffered downlink data frame; a configuration unit, configured to configure that the RSSI value of the wakeup frame generated by the generation unit is smaller than the set OBSS _ PD value, and configure a NAV value in a Duration field of a MAC frame header of the wakeup frame; a sending unit, configured to send the wakeup frame.
In the technical scheme, the RSSI value of the awakening frame is configured to be smaller than the set OBSS _ PD value when the awakening frame is generated, so that an STA receiving the awakening frame can update the NAV value of the STA in time, and the NAV value is pre-configured in the Duration field of the MAC frame header of the awakening frame to ensure that the STA cannot be accessed into a channel, so that the WUR and the IEEE802.11ax can be compatible, the subsequent communication between a sender and a receiver of the awakening frame is prevented from being interfered, the requirement of the WUR is met, the equipment is more power-saving, and meanwhile, the effective setting of the NAV value is realized in the awakening frame.
According to a fifth aspect of the present invention, there is also provided a communication device, comprising: communication means of a wireless local area network as described in the third aspect above; and/or a communication device of a wireless local area network as described in the fourth aspect above.
Through the technical scheme of the invention, when the RSSI value of the awakening frame from other BSS received by the STA is smaller than the set OBSS _ PD value, the current NAV value is updated to the NAV value preset in the Duration field of the MAC frame header of the awakening frame so as to ensure that the awakening frame cannot be accessed into a channel, so that the WUR and the IEEE802.11ax can be compatible, the subsequent communication between a sender and a receiver of the awakening frame is prevented from being interfered, the requirement of the WUR is met, the equipment is more power-saving, and meanwhile, the effective setting of the NAV value is realized in the awakening frame.
Drawings
Fig. 1 is a flowchart illustrating a communication method of a wireless local area network according to a first embodiment of the present invention;
fig. 2 is a schematic diagram illustrating setting of Duration field of MAC frame header when the wakeup frame is a multicast message frame or a broadcast message frame;
FIG. 3 is a diagram illustrating the setting of the Duration field of the MAC frame header when the wakeup frame is a unicast message frame;
FIG. 4 is a diagram illustrating the setting of the Duration field of the MAC frame header when the wake-up frame is a unicast message frame and the subsequent data frame is in OFDMA;
fig. 5 is a schematic structural diagram of a communication apparatus of a wireless local area network according to a first embodiment of the present invention;
fig. 6 is a flowchart illustrating a communication method of a wireless lan according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a communication apparatus of a wireless lan according to a second embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 is a flowchart illustrating a communication method of a wireless local area network according to a first embodiment of the present invention.
As shown in fig. 1, a communication method of a wireless local area network according to a first embodiment of the present invention includes the following steps:
in step S10, a message frame is received.
Step S12, when the message frame is from other BSSs, determine whether the message frame is a wakeup frame, where the wakeup frame is used to wake up the device in the sleep state of the main communication interface to enter the wakeup state to receive the buffered downlink data frame.
In this step, when the STA in the OBSS receives a message frame sent by a BSS other than the BSS in which the STA is located, it needs to determine whether the message frame is a wakeup frame (i.e., wake up frame) for waking up the device in the sleep state to enter the wakeup state to receive the data frame.
The receiver of the message frame may be a mobile phone, a PDA (Personal Digital Assistant), or a tablet, and the sender of the message frame is a router or a server with a Wi-Fi interface.
The interface for receiving the message frame is a secondary communication interface of the device, and the purpose of receiving the wake-up frame is to wake up a primary communication interface of the device for communication so as to obtain the buffered downlink data frame.
Further, the step S12 may be specifically executed as: and analyzing the indication information in the MAC frame header of the message frame to judge whether the message frame is a wakeup frame according to the indication information.
Thus, when the STA receives the message frame, it may specifically determine whether the message frame is the wakeup frame by analyzing whether the MAC frame header of the message frame has the indication information for determining that the message frame is the wakeup frame, and if the MAC frame header of the message frame has the corresponding indication information, it is determined as the wakeup frame, otherwise, it is the normal data frame or other management frame, where the sending power of the wakeup frame is much lower than that of the normal data frame.
Step S14, when the message frame is determined to be a wakeup frame and the RSSI value of the wakeup frame is smaller than the set OBSS _ PD value, the current NAV value is updated to the preset value in the Duration field of the MAC frame header of the wakeup frame.
When the device receives some data frames or management frames, analyzes and obtains the duration of the data frames or management frames, and sets the NAV of the device to be busy according to the analyzed duration, which indicates that the device cannot access the channel in the duration; for example, if the device currently sets its NAV duration to 4 and receives another data frame or management frame with duration 6, the device updates its NAV duration to 10, indicating that it does not access the channel during this duration.
In this step, if it is determined that a message frame received from another BSS is a wakeup frame and the RSSI value of the wakeup frame satisfies a condition that is less than the set OBSS _ PD value, the STA needs to update its current NAV value and updates the NAV value using a preset value in a Duration field of a MAC header of the wakeup frame during the update to ensure that it does not access the channel, so that the WUR is compatible with ieee802.11ax, thereby avoiding interference with subsequent communication between a sender and a receiver of the wakeup frame, satisfying the requirement of the WUR, making the device save more power, and simultaneously, implementing effective setting of the NAV value in the wakeup frame.
Further, in step S14 in the above embodiment, different preset values of NAV may be set in the Duration field of the MAC frame header according to different transmission modes of the wake-up frame, so as to adapt to updating of NAV values of multiple usage scenarios, specifically:
in one embodiment, when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values are: the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
In this embodiment, when the wake-up frame is transmitted in the form of a pair of multicast message frames or a pair of all broadcast message frames, the preset value of NAV in the Duration field of the MAC frame header may be set according to the above combination.
Specifically, as shown in fig. 2, taking the wakeup frame as a multicast message frame (i.e., a multicast WUR frame) as an example, one of the examples of the preset value of NAV is set in the Duration field of the MAC frame header.
In the second embodiment, when the wake-up frame is a unicast message frame, whether a subsequently received data frame adopts an OFDMA format is determined;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames; specifically, as shown in fig. 3, taking the wakeup frame as a unicast message frame (i.e., a unicast WUR frame) and the subsequent data frame in OFDMA format as an example, one of the preset values of NAV is set in the Duration field of the MAC frame header, where n is 3.
If not, the preset values are as follows: the sum of the time length of one awakening frame, the time length of one awakening response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS; specifically, as shown in fig. 4, taking the case that the wake-up frame is a unicast message frame (i.e., a unicast WUR frame) and the subsequent data frame does not adopt the OFDMA format, one of the examples of the preset value of NAV is set in the Duration field of the MAC frame header.
In this embodiment, when the wakeup frame is transmitted in the form of a one-to-one unicast message frame, the preset value of NAV in the Duration field of the MAC frame header of the device may be further set according to the corresponding combination according to the result of determining whether the data frame received after the device wakes up is in the OFDMA form.
In any of the above embodiments, the trigger frame is used to allocate spectrum resources for the PS-Poll frame and the downlink data frame, and the ACK frame is used to confirm that the sent data frame has been received without error, and SIFS is a short interframe space between two adjacent frames.
Further, in any of the above embodiments, after step S10 and before step S12, the method for communicating in a wireless local area network may further include:
and determining whether the message frame is from other BSSs according to the BSS color value of the signal field of the message frame.
In this embodiment, the BSS color value indicates the identity of the base station, and is used to distinguish the data of the BSS from the data of other BSSs. For example, when the BSS color1 value carried in the signal field of the received message frame is "001", it indicates that it is data from the current BSS, and if the BSS color value is not "001", it can be confirmed as data from other BSSs.
Further, in any of the above embodiments, after the step of determining that the message frame is the wakeup frame and before the step of updating the current NAV value, the communication method of the wireless local area network may further include the steps of:
the RSSI value of the wake-up frame is detected for comparison with the set OBSS _ PD value.
In this embodiment, in order to avoid that the STA erroneously updates its current NAV value, it is necessary to accurately detect the RSSI value of the wakeup frame in advance, thereby improving the communication efficiency.
Fig. 5 is a schematic structural diagram of a communication apparatus of a wireless local area network according to a first embodiment of the present invention.
As shown in fig. 5, a communication apparatus 500 of a wireless local area network according to a first embodiment of the present invention includes: a receiving unit 502, a judging unit 504 and an updating unit 506.
The receiving unit 502 is configured to receive a message frame; the determining unit 504 is configured to determine whether the message frame received by the receiving unit 502 is a wakeup frame when the message frame is from another BSS, where the wakeup frame is used to wake up the device with the main communication interface in the sleep state to enter the wakeup state to receive the buffered downlink data frame; the updating unit 506 is configured to update the current NAV value to a preset value in a Duration field of a MAC frame header of the wakeup frame when the determining unit 504 determines that the message frame is the wakeup frame and when the RSSI value of the wakeup frame is smaller than the set OBSS _ PD value.
In this embodiment, when an STA in an OBSS receives a message frame sent by another BSS except its own BSS, it needs to determine whether the message frame is a wakeup frame, and if so, and the RSSI value of the wakeup frame meets the condition that the RSSI value of the wakeup frame is smaller than the set OBSS _ PD value, the STA needs to update its current NAV value, and update the current NAV value by using a preset value in a Duration field of a MAC header of the wakeup frame during updating, so as to ensure that the STA does not access the channel, so that the WUR is compatible with ieee802.11ax, thereby avoiding interference with subsequent communication between a sender and a receiver of the wakeup frame, meeting the requirement of the WUR, making the device more power-saving, and simultaneously, implementing effective setting of NAV value in the wakeup frame.
When the device receives some data frames or management frames, analyzes and obtains the duration of the data frames or management frames, and sets the NAV of the device to be busy according to the analyzed duration, which indicates that the device cannot access the channel in the duration; for example, if the device currently sets its NAV duration to 4 and receives another data frame or management frame with duration 6, the device updates its NAV duration to 10, indicating that it does not access the channel during this duration.
In addition, the receiver of the message frame can be a mobile phone, a PDA or a tablet and other devices, and the sender of the message frame is a router or a server with a Wi-Fi interface; the interface for receiving the message frame is a secondary communication interface of the device, and the purpose of receiving the wake-up frame is to wake up the primary communication interface of the device for communication so as to obtain the buffered downlink data frame.
Further, in the above embodiment, different preset values of NAV may be set in the Duration field of the MAC frame header according to different transmission modes of the wakeup frame, so as to adapt to updating of NAV values of multiple usage scenarios, specifically:
in one embodiment, when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values are: the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
In this embodiment, when the wake-up frame is transmitted in the form of a pair of multicast message frames or a pair of all broadcast message frames, the preset value of NAV in the Duration field of the MAC frame header may be set according to the above combination.
In the second embodiment, when the wake-up frame is a unicast message frame, whether a subsequently received data frame adopts an OFDMA format is determined;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames;
if not, the preset values are as follows: the sum of the time length of one wakeup frame, the time length of one wakeup response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS.
In this embodiment, when the wakeup frame is transmitted in the form of a one-to-one unicast message frame, the preset value of NAV in the Duration field of the MAC frame header of the device may be further set according to the corresponding combination according to the result of determining whether the data frame received after the device wakes up is in the OFDMA form.
In any of the above embodiments, the ACK frame is used to confirm that the sent data frame has been received without error, the trigger frame is used to allocate spectrum resources for the PS-Poll frame and the downlink data frame, and the SIFS is a short interframe space between two adjacent frames.
Further, in any of the above embodiments, the determining unit 504 specifically includes: a parsing sub-unit 5042 and a determining sub-unit 5044.
The parsing subunit 5042 is configured to parse the indication information in the MAC frame header of the message frame, and the determining subunit 5044 is configured to determine whether the message frame is a wakeup frame according to the indication information parsed by the parsing subunit 5042.
In this embodiment, when the STA receives the message frame, it may specifically analyze whether the MAC frame header of the message frame has indication information for determining that the message frame is a wakeup frame, so as to accurately determine whether the message frame is a wakeup frame, and if the MAC frame header of the message frame has corresponding indication information, it is determined as a wakeup frame, otherwise, it is a normal data frame, where the sending power of the wakeup frame is much lower than that of the normal data frame.
Further, in any of the above embodiments, the communication apparatus 500 of the wireless local area network further includes: a determination unit 508 and a detection unit (not shown in the figure).
The determining unit 508 is configured to determine whether the message frame is from another BSS according to the BSS color value of the signal field of the message frame after the receiving unit 502 receives the message frame and before the determining unit 504 determines whether the message frame is the wakeup frame.
In this embodiment, the BSS color value indicates the identity of the base station, and is used to distinguish the data of the BSS from the data of other BSSs. For example, when the BSS color1 value carried in the signal field of the received message frame is "001", it indicates that it is data from the current BSS, and if the BSS color value is not "001", it can be confirmed as data from other BSSs.
The detection unit is configured to detect the RSSI value of the wakeup frame after the determination unit 504 determines that the message frame is the wakeup frame and before the update unit 506 updates the current NAV value, so as to compare the RSSI value with the set OBSS _ PD value.
In this embodiment, in order to avoid that the STA erroneously updates its current NAV value, it is necessary to accurately detect the RSSI value of the wakeup frame in advance, thereby improving the communication efficiency.
In a specific implementation, the receiving unit 502 may be a receiver or an antenna, etc.; the judging unit 504, the updating unit 506, the determining unit 508 and the detecting unit may be a central processor or a baseband processor, etc.
Fig. 6 is a flowchart illustrating a communication method of a wireless lan according to a second embodiment of the present invention.
As shown in fig. 6, a communication method of a wireless local area network according to a second embodiment of the present invention includes the following steps:
step S60, a wake-up frame is generated, where the wake-up frame is used to wake up the device in the sleep state of the main communication interface to enter the wake-up state to receive the buffered downlink data frame.
Step S62, configuring the RSSI value of the wakeup frame to be less than the set OBSS _ PD value, and configuring the NAV value in the Duration field of the MAC frame header of the wakeup frame.
Step S64, a wakeup frame is sent.
In this embodiment, the RSSI value of the STA receiving the wakeup frame is configured to be smaller than the set OBSS _ PD value when the wakeup frame is generated, so that the NAV value of the STA can be updated in time, and the NAV value is pre-configured in the Duration field of the MAC frame header of the wakeup frame, so as to ensure that the STA does not access the channel, so that the WUR is compatible with ieee802.11ax, thereby avoiding interference with subsequent communication between the sender and the receiver of the wakeup frame, meeting the requirement of the WUR, making the device more power-saving, and at the same time, effectively setting the NAV value in the wakeup frame.
When the device receives some data frames or management frames, analyzes and obtains the duration of the data frames or management frames, and sets the NAV of the device to be busy according to the analyzed duration, which indicates that the device cannot access the channel in the duration; for example, if the device currently sets its NAV duration to 4 and receives another data frame or management frame with duration 6, the device updates its NAV duration to 10, indicating that it does not access the channel during this duration.
Further, in the above embodiment, different preset values of NAV may be set in the Duration field of the MAC frame header according to different transmission modes of the wakeup frame, so as to adapt to updating of NAV values of multiple usage scenarios, specifically:
in one embodiment, when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values are: the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
In this embodiment, when the wake-up frame is transmitted in the form of a pair of multicast message frames or a pair of all broadcast message frames, the preset value of NAV in the Duration field of the MAC frame header may be set according to the above combination.
In the second embodiment, when the wake-up frame is a unicast message frame, whether a subsequently received data frame adopts an OFDMA format is determined;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames;
if not, the preset values are as follows: the sum of the time length of one wakeup frame, the time length of one wakeup response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS.
In this embodiment, when the wakeup frame is transmitted in the form of a one-to-one unicast message frame, the preset value of NAV in the Duration field of the MAC frame header of the device may be further set according to the corresponding combination according to the result of determining whether the data frame received after the device wakes up is in the OFDMA form.
In any of the above embodiments, the ACK frame is used to confirm that the sent data frame has been received without error, and SIFS is a short interframe space between two adjacent frames.
The main body of the communication method shown in fig. 6 may be an access point device in a network formed by an access point and a station, or may be a master station device in a peer-to-peer network formed by stations.
Fig. 7 is a schematic structural diagram of a communication apparatus of a wireless lan according to a second embodiment of the present invention.
As shown in fig. 7, a communication apparatus 700 of a wireless lan according to a second embodiment of the present invention includes: a generating unit 702, a configuring unit 704 and a transmitting unit 706.
The generating unit 702 is configured to generate a wakeup frame, where the wakeup frame is used to wake up a device in a sleep state of a main communication interface to enter a wakeup state to receive a buffered downlink data frame; the configuring unit 704 is configured to configure that the RSSI value of the wake-up frame generated by the generating unit 702 is smaller than the set OBSS _ PD value, and configure a NAV value in a Duration field of a MAC frame header of the wake-up frame; the sending unit 706 is configured to send a wake-up frame.
In this embodiment, the RSSI value of the STA receiving the wakeup frame is configured to be smaller than the set OBSS _ PD value when the wakeup frame is generated, so that the NAV value of the STA can be updated in time, and the NAV value is pre-configured in the Duration field of the MAC frame header of the wakeup frame, so as to ensure that the STA does not access the channel, so that the WUR is compatible with ieee802.11ax, thereby avoiding interference with subsequent communication between the sender and the receiver of the wakeup frame, meeting the requirement of the WUR, making the device more power-saving, and at the same time, effectively setting the NAV value in the wakeup frame.
When the device receives some data frames or management frames, analyzes and obtains the duration of the data frames or management frames, and sets the NAV of the device to be busy according to the analyzed duration, which indicates that the device cannot access the channel in the duration; for example, if the device currently sets its NAV duration to 4 and receives another data frame or management frame with duration 6, the device updates its NAV duration to 10, indicating that it does not access the channel during this duration.
In a specific implementation, the generating unit 702 may be a signal processor, a central processing unit, a baseband processor, or the like; the configuration unit 704 may be a central processor or a baseband processor, etc.; the transmitting unit 706 may be a transmitter or an antenna, etc.
Further, in the above embodiment, different preset values of NAV may be set in the Duration field of the MAC frame header according to different transmission modes of the wakeup frame, so as to adapt to updating of NAV values of multiple usage scenarios, specifically:
in one embodiment, when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values are: the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
In this embodiment, when the wake-up frame is transmitted in the form of a pair of multicast message frames or a pair of all broadcast message frames, the preset value of NAV in the Duration field of the MAC frame header may be set according to the above combination.
In the second embodiment, when the wake-up frame is a unicast message frame, whether a subsequently received data frame adopts an OFDMA format is determined;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames;
if not, the preset values are as follows: the sum of the time length of one wakeup frame, the time length of one wakeup response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS.
In this embodiment, when the wakeup frame is transmitted in the form of a one-to-one unicast message frame, the preset value of NAV in the Duration field of the MAC frame header of the device may be further set according to the corresponding combination according to the result of determining whether the data frame received after the device wakes up is in the OFDMA form.
In any of the above embodiments, the ACK frame is used to confirm that the sent data frame has been received without error, and SIFS is a short interframe space between two adjacent frames.
The present invention also provides a communication device, comprising: a communication device 500 of a wireless local area network as shown in fig. 5; and/or a communication device 700 of a wireless local area network as shown in fig. 7.
The technical scheme of the invention is explained in detail above with reference to the drawings, and when the RSSI value of the wake-up frame received by the STA from other BSS is smaller than the set OBSS _ PD value, the current NAV value of the STA is updated to the NAV value preset in the Duration field of the MAC frame header of the wake-up frame, so as to ensure that the STA does not access the channel, so that the WUR is compatible with the ieee802.11ax, thereby avoiding interference with subsequent communication between the sender and the receiver of the wake-up frame, satisfying the requirement of the WUR, saving more power for the device, and simultaneously realizing effective setting of the NAV value in the wake-up frame.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A communication method for a wireless local area network, comprising:
receiving a message frame;
when the message frame comes from other BSSs, judging whether the message frame is a wakeup frame, wherein the wakeup frame is used for waking up the equipment with the main communication interface in the sleep state to enter the wakeup state so as to receive the cached downlink data frame;
when the message frame is judged to be the awakening frame and the RSSI value of the awakening frame is smaller than the set OBSS _ PD value, updating the current NAV value to the preset value in the Duration field of the MAC frame header of the awakening frame;
when the wake-up frame is a multicast message frame or a broadcast message frame, the preset values are as follows:
the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
2. The communication method of the wireless local area network according to claim 1,
when the awakening frame is a unicast message frame, judging whether a subsequently received data frame adopts an OFDMA form;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames;
if not, the preset values are as follows: the sum of the time length of one wakeup frame, the time length of one wakeup response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS.
3. The communication method of the wireless local area network according to claim 1 or 2,
the step of judging whether the message frame is a wakeup frame specifically includes: analyzing the indication information in the MAC frame header of the message frame to judge whether the message frame is a wakeup frame according to the indication information; and
after the step of receiving the message frame and before the step of judging whether the message frame is a wakeup frame, the method further includes: and determining whether the message frame is from other BSSs according to the BSS color value of the signal field of the message frame.
4. A communication method for a wireless local area network, comprising:
generating a wake-up frame, wherein the wake-up frame is used for waking up a device of which a main communication interface is in a dormant state to enter a wake-up state so as to receive a cached downlink data frame;
configuring the RSSI value of the wake-up frame to be smaller than the set OBSS _ PD value, and configuring a NAV value in a Duration field of a MAC frame header of the wake-up frame;
sending the wake-up frame;
when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values of the NAV values are as follows:
the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
5. A communication apparatus of a wireless local area network, comprising:
a receiving unit for receiving a message frame;
a judging unit, configured to judge whether the message frame received by the receiving unit is a wakeup frame when the message frame is from another BSS, where the wakeup frame is used to wake up a device in a sleep state of a main communication interface to enter a wakeup state to receive a cached downlink data frame;
an updating unit, configured to update a current NAV value to a preset value in a Duration field of a MAC frame header of the wakeup frame when the determining unit determines that the message frame is the wakeup frame and when the RSSI value of the wakeup frame is smaller than a set OBSS _ PD value;
when the wake-up frame is a multicast message frame or a broadcast message frame, the preset values are as follows:
the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
6. The apparatus of claim 5, wherein when the wakeup frame is a unicast message frame, determining whether a subsequently received data frame is in an OFDMA format;
if yes, the preset values are as follows: the sum of the duration of one wakeup frame, the duration of n wakeup frames, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and (n +4) SIFS, wherein n is the number of subsequently received wakeup frames;
if not, the preset values are as follows: the sum of the time length of one wakeup frame, the time length of one wakeup response frame, the time length of one downlink data frame, the time length of one ACK frame and three SIFS.
7. The apparatus according to claim 5 or 6, wherein the determining unit specifically comprises: an analysis subunit and a judgment subunit, wherein,
the analysis subunit is configured to analyze indication information in an MAC frame header of the message frame, and the judgment subunit is configured to judge whether the message frame is a wakeup frame according to the indication information analyzed by the analysis subunit; and
the communication device of the wireless local area network further comprises:
and the determining unit is used for determining whether the message frame is from other BSSs according to the BSS color value of the signal field of the message frame after the receiving unit receives the message frame and before the judging unit judges whether the message frame is the wakeup frame.
8. A communication apparatus of a wireless local area network, comprising:
a generating unit, configured to generate a wake-up frame, where the wake-up frame is used to wake up a device in a sleep state of a main communication interface to enter a wake-up state to receive a buffered downlink data frame;
a configuration unit, configured to configure that the RSSI value of the wakeup frame generated by the generation unit is smaller than the set OBSS _ PD value, and configure a NAV value in a Duration field of a MAC frame header of the wakeup frame;
a sending unit, configured to send the wakeup frame;
when the wakeup frame is a multicast message frame or a broadcast message frame, the preset values of the NAV values are as follows:
the sum of the duration of one wakeup frame, the duration of one trigger frame, the duration of one WUR poll, the duration of one downlink data frame, the duration of one ACK frame and four SIFS.
9. A communication device, comprising:
communication means of a wireless local area network according to any one of claims 5 to 7; and/or
Communication device of a wireless local area network according to claim 8.
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