CN111787626B

CN111787626B - Data transmission protection method and device

Info

Publication number: CN111787626B
Application number: CN202010657955.XA
Authority: CN
Inventors: 刘应状; 范巍巍; 李云波; 罗俊; 林英沛; 彼得·禄
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-12-08
Filing date: 2016-06-21
Publication date: 2024-02-02
Anticipated expiration: 2036-06-21
Also published as: ES2899354T3; HUE055924T2; CN111787626A; WO2017097067A1

Abstract

The embodiment of the invention discloses a data transmission protection method and a device thereof, wherein the method comprises the following steps: the station receives a trigger frame sent by an access point of a Basic Service Set (BSS) associated with the station; and selecting an available sub-channel frequency band for data transmission from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vector NAVs set on the sub-channel frequency band of the channel transmission bandwidth of the BSS, and responding to the trigger frame. The embodiment of the invention can select the available sub-channel frequency band for data transmission through the current values of at least two NAVs to respond to the trigger frame, thereby being beneficial to reducing the data transmission interference and improving the frequency band utilization rate.

Description

Data transmission protection method and device

The present application claims priority from chinese patent office, application No. 2015197813.x, chinese patent application entitled "a data transmission protection method and apparatus thereof," filed on 8-12-2015, the entire contents of which are incorporated herein by reference.

Technical Field

The invention relates to the technical field of communication, in particular to a data transmission protection method and a device thereof.

Background

The channel access mechanism used by IEEE802.11 MAC in existing wireless local area network (Wireless local area network, WLAN) systems is a carrier sense multiple access/collision avoidance (Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA) mechanism that can be used to detect and avoid collisions on the network when two or more network devices need to transmit data, where the virtual carrier sense mechanism in the CSMA/CA mechanism can implement control over data transmission by means of network allocation vectors (Network Allocation Vector, NAV) maintained by each station for recording station-to-channel occupancy time.

With the advancement of the 802.11ax communication standard, the provided 5GHz transmission bandwidth has more abundant channel transmission bandwidth resources than 2.4GHz, the channel transmission bandwidth resources can be divided into a plurality of sub-channel transmission bandwidths, each sub-channel transmission bandwidth can be allocated to different stations by an access point, and the stations are scheduled to transmit data on the different sub-channel transmission bandwidths simultaneously by adopting a trigger frame. According to the virtual carrier sense mechanism in the existing 802.11 standard protocol, a station ignores a relatively small time domain value duration contained in a received protocol data unit (physical layer convergence procedure (PLCP) protocol data unit, PPDU) of a physical layer convergence procedure protocol (physical layer convergence procedure, PLCP) of the station, and maintains its current value of NAV, and when a trigger frame sent by an associated access point of a basic service set (Basic Service Set, BSS) is received, data transmission of an overlapping basic service set (Overlap Basic Service Set, OBSS) may be interfered due to response to the trigger frame. On the other hand, in the prior art, data transmission on all channel sub-bands of the entire channel transmission bandwidth is generally controlled by using a single NAV, when a target station receives a scheduling frame on a certain frequency band, the NAV updates the current value of the NAV according to a duration larger than the current value, and even if an adjacent station or an access point does not occupy the current frequency band, the target station still cannot perform data transmission on the current frequency band due to the fact that the current value of the NAV still does not meet a preset threshold value, so that the utilization rate of the frequency band is greatly reduced.

Disclosure of Invention

The embodiment of the invention provides a data transmission protection method and a device thereof, which adopt a plurality of NAVs to control data transmission so as to reduce data transmission interference and improve the frequency band utilization rate.

The first aspect of the embodiment of the invention discloses a data transmission protection method, which comprises the following steps:

the station receives a trigger frame sent by an access point of a Basic Service Set (BSS) associated with the station;

and selecting an available sub-channel frequency band for data transmission from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vector NAVs set on the sub-channel frequency band of the channel transmission bandwidth of the BSS, and responding to the trigger frame.

With reference to the first aspect of the present invention, in a first implementation manner of the first aspect of the present invention, when a trigger frame sent by an access point of a basic service set BSS associated with a station is received, before selecting an available sub-channel band from a channel transmission bandwidth of the BSS to respond to the trigger frame according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS, the method further includes:

setting two network allocation vectors NAVs on all sub-channel frequency bands of the channel transmission bandwidth of a basic service set BSS associated with a station, wherein the network allocation vectors NAVs comprise an intra-NAV and an inter-NAV; or alternatively, the first and second heat exchangers may be,

Setting an intra-NAV and at least one inter-NAV corresponding to each Overlapped Basic Service Set (OBSS) monitored on all sub-channel frequency bands of channel transmission bandwidths of a Basic Service Set (BSS) associated with a station;

wherein the intra-NAV is used for recording the time length of the station prohibited from transmitting data on all sub-channel frequency bands of the channel transmission bandwidth by the BSS, and the inter-NAV is used for recording the time length of the OBSS monitored by the station prohibited from transmitting data on all sub-channel frequency bands of the channel transmission bandwidth.

With reference to the first aspect of the embodiment of the present invention, in a second possible implementation manner of the first aspect of the embodiment of the present invention, when receiving a trigger frame sent by an access point of a basic service set BSS associated with a station, before selecting an available sub-channel band from a channel transmission bandwidth of the BSS to respond to the trigger frame according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS, the method further includes:

setting an intra-NAV on all sub-channel frequency bands of the channel transmission bandwidth and setting an inter-NAV on each sub-channel frequency band of the channel transmission bandwidth respectively; or (b)

Setting an intra-NAV on all sub-channel frequency bands of the channel transmission bandwidth and setting at least one inter-NAV corresponding to each monitored Overlapped Basic Service Set (OBSS) on each sub-channel frequency band of the channel transmission bandwidth;

the intra-NAV is used for recording the time length of the station which is forbidden by the BSS to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the inter-NAV is used for recording the time length of the OBSS monitored by the station which is forbidden to perform data transmission on the sub-channel frequency bands set with the inter-NAV.

With reference to the first aspect of the embodiment of the present invention, in a third possible implementation manner of the first aspect of the embodiment of the present invention, when a trigger frame sent by an access point of a basic service set BSS associated with a station is received, before selecting an available sub-channel band from a channel transmission bandwidth of the BSS to respond to the trigger frame according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS, the method further includes:

two network allocation vectors NAVs including an intra-NAV and an inter-NAV are respectively arranged on each sub-channel frequency band of the channel transmission bandwidth; or (b)

Respectively setting an intra-NAV and at least one inter-NAV which corresponds to the monitored overlapped basic service set OBSS one by one on each sub-channel frequency band of the channel transmission bandwidth;

wherein the intra-NAV is used for recording the time length of the station prohibited by the BSS from transmitting data on the sub-channel frequency band in which the intra-NAV is set, and the inter-NAV is used for recording the time length of the OBSS heard by the station prohibited from transmitting data on the sub-channel frequency band in which the inter-NAV is set.

With reference to the first aspect of the embodiment of the present invention, in a fourth possible implementation manner of the first aspect of the embodiment of the present invention, when a trigger frame sent by an access point of a basic service set BSS associated with a station is received, before selecting an available sub-channel band from a channel transmission bandwidth of the BSS to respond to the trigger frame according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS, the method further includes:

setting a NAV on each sub-channel frequency band of the channel transmission bandwidth;

wherein the NAV is used to record a length of time that the station is prohibited from transmitting data on a subchannel band in which the NAV is set by other stations or access points other than the station.

With reference to the first possible implementation manner of the first aspect of the present invention, in a fifth possible implementation manner of the first aspect of the present invention, the selecting, from the channel transmission bandwidth of the BSS, an available sub-channel band for data transmission in response to the trigger frame according to current values of at least two network allocation vectors NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS includes:

when an inter-NAV is set on all sub-channel frequency bands of the channel transmission bandwidth, if the current value of the inter-NAV is equal to the preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission to respond to the trigger frame;

when at least one inter-NAV corresponding to each monitored OBSS is set on all sub-channel frequency bands of the channel transmission bandwidth, if the current value of the inter-NAV is equal to the preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission to respond to the trigger frame.

With reference to the second possible implementation manner or the third possible implementation manner of the first aspect of the embodiment of the present invention, in a sixth possible implementation manner of the first aspect of the embodiment of the present invention, the selecting, from the channel transmission bandwidth of the BSS, an available sub-channel band for data transmission in response to the trigger frame according to current values of at least two network allocation vectors NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS includes:

When each sub-channel frequency band of the channel transmission bandwidth is respectively provided with an inter-NAV, selecting at least one sub-channel frequency band with the current value equal to a preset value of the inter-NAV as an available sub-channel frequency band for data transmission to respond to the trigger frame;

when at least one inter-NAV corresponding to each monitored overlapped basic service set OBSS is set on each sub-channel frequency band of the channel transmission bandwidth, if at least one sub-channel frequency band exists, the current value of all the set inter-NAVs is equal to a preset value, and the at least one sub-channel frequency band is selected as an available sub-channel frequency band for data transmission to respond to the trigger frame.

With reference to the fourth possible implementation manner of the first aspect of the present invention, in a seventh possible implementation manner of the first aspect of the present invention, the selecting, from the channel transmission bandwidth of the BSS, an available sub-channel band for data transmission in response to the trigger frame according to current values of at least two network allocation vectors NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS includes:

selecting at least one sub-channel frequency band of which the current value of the NAV is equal to a preset value as an available sub-channel frequency band for data transmission in response to the trigger frame; or (b)

At least one sub-channel band from which the current value of the NAV originates from the BSS is selected as an available sub-channel band for data transmission in response to the trigger frame.

With reference to the first possible implementation manner to the seventh possible implementation manner of the first aspect of the embodiment of the present invention, in an eighth possible implementation manner of the first aspect of the embodiment of the present invention, the method further includes: after the available sub-channel frequency band is selected, confirming the frequency domain resource of the transmission of the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame, so as to transmit the data frame on the confirmed frequency domain resource.

With reference to the first possible implementation manner to the eighth possible implementation manner of the first aspect of the embodiment of the present invention, in a ninth possible implementation manner of the first aspect of the embodiment of the present invention, when a trigger frame sent by an access point of a basic service set BSS associated with a station is received, before selecting an available sub-channel band for data transmission from among channel transmission bandwidths of the BSS according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS to respond to the trigger frame, the method further includes:

When receiving a PPDU, judging the source of the PPDU and judging the type of the PPDU;

if the PPDU is derived from an access point of a Basic Service Set (BSS) associated with a station and is a trigger frame, judging whether a scheduling target of the trigger frame contains the station or not;

and if the scheduling target of the trigger frame comprises the station, executing the current value of at least two network allocation vectors NAVs set on the sub-channel frequency bands of the channel transmission bandwidth of the BSS, and selecting an available sub-channel frequency band for data transmission from the channel transmission bandwidth of the BSS to respond to the trigger frame.

With reference to the ninth possible implementation manner of the first aspect of the embodiment of the present invention, in a tenth possible implementation manner of the first aspect of the embodiment of the present invention, after the determining the PPDU source, the method further includes:

if the PPDU is derived from a basic service set BSS associated with a station and the station is not a sending target of the PPDU, acquiring the PPDU to acquire a duration value duration;

if the current value of the intra-NAV set on all sub-channel frequency bands of the channel transmission bandwidth is smaller than the duration, updating the current value of the intra-NAV to the duration; or (b)

And acquiring a designated sub-channel frequency band in the PPDU, and if the current value of the intra-NAV set on the designated sub-channel frequency band is smaller than the duration, updating the current value of the intra-NAV to the duration.

With reference to the ninth possible implementation manner of the first aspect of the embodiment of the present invention, in an eleventh possible implementation manner of the first aspect of the embodiment of the present invention, after the determining the source of the PPDU, the method further includes:

if the PPDU is derived from an OBSS, acquiring a duration value duration in the PPDU;

when one inter-NAV is set in all sub-channel frequency bands, if the current value of the inter-NAV set in all sub-channel frequency bands of the channel transmission bandwidth is smaller than the duration, updating the current value of the inter-NAV to be the duration;

when at least one inter-NAV corresponding to the OBSS monitored by the station is set in the all sub-channel frequency bands, if the current value of the inter-NAV corresponding to the OBSS with the same PPDU source of the duration is smaller than the duration, updating the inter-NAV corresponding to the OBSS with the same PPDU source of the duration to the duration;

when each sub-channel frequency band is provided with an inter-NAV, acquiring a designated sub-channel frequency band in the PPDU, and if the current value of the inter-NAV in the designated sub-channel frequency band is smaller than the duration, updating the current value of the inter-NAV in the designated sub-channel frequency band smaller than the duration into the duration;

And when each monitored OBSS on each sub-channel frequency band corresponds to an inter-NAV respectively, acquiring a designated sub-channel frequency band in the PPDU, and if the inter-NAV corresponding to the OBSS from the PPDU exists in the designated sub-channel frequency band, updating the current value of the inter-NAV which is smaller than the duration and corresponds to the OBSS from the PPDU one by one and is set on the target designated sub-channel frequency band into the duration.

With reference to the ninth possible implementation manner of the first aspect of the embodiment of the present invention, in a twelfth possible implementation manner of the first aspect of the embodiment of the present invention, after receiving the PPDU, the method further includes:

and when the PPDU is derived from an Overlapped Basic Service Set (OBSS) or when the PPDU is derived from a Basic Service Set (BSS) associated with a station and the station is not a transmission target of the PPDU, acquiring a designated sub-channel frequency band and a duration value duration in the PPDU, and if a designated sub-channel frequency band with a NAV current value smaller than the duration exists in the designated sub-channel frequency band, updating the NAV current value smaller than the duration in the designated sub-channel frequency band to the duration.

With reference to the ninth possible implementation manner of the first aspect of the embodiment of the present invention, in a thirteenth possible implementation manner of the first aspect of the embodiment of the present invention, after the determining a source of the PPDU and determining a type of the PPDU when the PPDU is received, the method further includes:

if the received contention-free period ending CF-END frame is sourced from the BSS, updating the current value of the intra-NAV set by the station on all sub-channel frequency bands of the channel transmission bandwidth of the BSS to a preset value; or (b)

And if the received contention-free period ending CF-END frame is sourced from the BSS, acquiring a designated sub-channel frequency band in the CF-END frame, and updating the current value of the intra-NAV set by the station on the designated sub-channel frequency band to a preset value.

With reference to the ninth possible implementation manner of the first aspect of the embodiment of the present invention, in a fourteenth possible implementation manner of the first aspect of the embodiment of the present invention, the method further includes:

if the received contention-free period ending CF-END frame is derived from an Overlapped Basic Service Set (OBSS), updating the current value of the inter-NAV set by the station on all sub-channel frequency bands to a preset value; or (b)

If the received contention-free period ending CF-END frame is derived from an Overlapped Basic Service Set (OBSS), the station sets the current value of an inter-NAV corresponding to the OBSS with the same source of the CF-END frame on all sub-channel frequency bands to be updated to a preset value; or (b)

If the received contention-free period END CF-END frame is derived from an Overlapping Basic Service Set (OBSS), acquiring a designated sub-channel frequency band in the CF-END frame, and updating the current value of an inter-NAV set on the designated sub-channel frequency band to a preset value; or (b)

If the received contention-free period ENDs, the CF-END frame is sourced from an Overlapping Basic Service Set (OBSS), a designated sub-channel frequency band in the CF-END frame is acquired, and the current value of an inter-NAV set on the designated sub-channel frequency band corresponding to the OBSS with the same source of the CF-END frame is updated to be a preset value; or (b)

And if the received contention-free period END CF-END frame is derived from the Overlapped Basic Service Set (OBSS), acquiring designated sub-channel frequency bands in the CF-END frame, and updating the current values of all inter-NAVs which are respectively set on each designated sub-channel frequency band and are in one-to-one correspondence with the OBSS with the same source of the CF-END frame to a preset value.

With reference to the ninth possible implementation manner of the first aspect of the embodiment of the present invention, in a fifteenth possible implementation manner of the first aspect of the embodiment of the present invention, the method further includes:

if the received PPDU is a contention free period ending CF-END frame, acquiring a designated sub-channel frequency band in the CF-END frame, and if the source of the current value of the NAV set on the designated sub-channel frequency band is consistent with the source of the CF-END frame, updating the current value of the NAV to a preset value.

The second aspect of the embodiment of the invention discloses a data transmission protection device, which has the function of realizing the actual station behavior of the method, wherein the function can be realized by hardware or by executing corresponding software on the hardware. The hardware or software may include one or more modules corresponding to the functions described above.

In another possible design, the apparatus includes a processor configured to support the station to perform the functions of the method described above, and a wireless communication module to support communication between the station and an access point or other station to which the PPDU designed in the method described above is transceived. The apparatus includes a memory for coupling with the processor, storing program instructions and data necessary for the station.

In the embodiment of the invention, the trigger frame sent by the access point of the BSS associated with the station can be received, and the available sub-channel frequency band for data transmission is selected from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vector NAVs arranged on the sub-channel frequency band of the channel transmission bandwidth of the BSS so as to respond to the trigger frame, thereby reducing data transmission interference, and NAVs can be respectively arranged for different channel transmission bandwidths so as to avoid the waste of frequency band resources and improve the frequency band utilization rate.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a WLAN architecture according to an embodiment of the present invention;

fig. 2 is a schematic diagram of channel access contention according to an embodiment of the present invention;

fig. 3 is a flow chart of a data transmission protection method according to an embodiment of the present invention.

Fig. 4 is a flow chart of another data transmission protection method according to an embodiment of the present invention;

fig. 5 is a flow chart of another data transmission protection method according to an embodiment of the present invention;

fig. 6 is a flow chart of another data transmission protection method according to an embodiment of the present invention;

fig. 7 is a flow chart of another data transmission protection method according to an embodiment of the present invention;

fig. 8 is a flow chart of another data transmission protection method according to an embodiment of the present invention;

Fig. 9 is a flow chart of another data transmission protection method according to an embodiment of the present invention;

fig. 10 is a flow chart of another data transmission protection method according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a data transmission protection device according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a data transmission protection device according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

In the embodiment of the invention, the channel transmission bandwidth may include 20MHz, 40MHz, 80MHz or 160MHz, and the whole channel transmission bandwidth may be divided into a plurality of sub-channel frequency bands by using 20MHz as the minimum unit channel transmission frequency band, and one or more NAVs may be set according to the sub-channel frequency bands. The source of the current value of the NAV, intra-NAV, or inter-NAV in this embodiment refers to which BSS or OBSS the PPDU setting the current NAV, intra-NAV, or inter-NAV originates from. It should be emphasized that, in the embodiment of the present invention, the preset value may be 0, or may be set as required; the scheduling target can judge through the scheduling identification in the signaling B part of the data frame or the resource indication information of the trigger frame; the transmission destination may be determined by a reception address in the PPDU.

In order to facilitate understanding of the embodiments of the present invention, a WLAN structure schematic of the embodiments of the present invention is described below. Referring to fig. 1, fig. 1 is a schematic diagram of a WLAN structure disclosed in an embodiment of the present invention, wherein a basic component of a WLAN based on IEEE802.11 technology is a BSS, and the BSS is composed of an Access Point (AP) and a plurality of Stations (STAs), wherein the AP may be a base Station, a router, a switch, etc. and may be used for scheduling STAs within the BSS, and the STAs may be wireless Access devices such as a notebook, a wireless speaker, a smart phone, etc. and may be used for scheduling APs of the Access points in response to the BSS. In fig. 1, BSS1 and BSS2 are adjacent BSSs, and share different sub-channel bands of the channel transmission bandwidth. The STAs 1-3 are stations of the BSS1, the AP1 is an access point of the BSS1, the STA4 is a station of the BSS2, the AP2 is an access point of the BSS2, and the STA2 is in an overlapping area of the BSS1 and the BSS2, so that data frames of stations or access points close to the STA2 in the AP1 and the BSS2 of the BSS1 can be monitored simultaneously.

The IEEE802.11 working group sequentially establishes a high-efficiency wireless local area network study group (High Efficiency WLAN Study Group, HEW SG) and an 802.11ax working group, the transmission bandwidth is upgraded from 2.4GHz to 5GHz, the ap can divide the whole channel transmission bandwidth into different sub-channel frequency bands, and allocate the different sub-channel frequency bands to different STAs, and the plurality of STAs are scheduled by adopting a trigger frame sent by an access point of the BSS, so that data transmission is performed on the plurality of different frequency bands simultaneously. According to the existing 802.11 standard, the STA may ignore the smaller duration included in the OBSS trigger frame and maintain its own timer NAV, and when the STA responds to the currently received scheduling frame of the BSS, it may cause interference to the data transmission of the OBSS. As shown in fig. 1, when STA2 receives a trigger frame sent by AP1 and having a scheduling target of STA2, a NAV is set according to duration1 of the trigger frame, if a data frame of STA4 is received and duration2 carried by the frame is smaller than duration1, the NAV maintains the current duration1 unchanged, and if STA2 receives a trigger frame sent by AP1 and having a scheduling target of STA2 again in a time greater than duration1 and less than duration2, STA2 will respond to the trigger frame sent by AP1, and at this time, a data frame sent by STA2 to AP1 may be received by STA4 that is performing data transmission, thereby causing interference to OBSS data transmission.

On the other hand, since the frequency bands used by the AP of each BSS for scheduling STAs may be different, there may be a problem of resource waste in that a single timer NAV of the existing 802.11 standard is used to manage scheduling on a plurality of sub-channel frequency bands. Fig. 2 is a schematic diagram of channel access contention, as shown in fig. 2, if the channel bandwidth is divided into sub-channel bands 1-4, when the AP2 on the OBSS schedules the STA2 on the sub-channel band 4 and the AP3 schedules the STA3 on the band 1, the STA1 will set the NAV according to the maximum duratinon in the response data frame of the STA2 or the STA3, and since the entire bandwidth has only one NAV, even if the adjacent access point or station of the STA1 does not occupy the sub-channel bands 2 and 3, the STA1 cannot perform uplink data transmission with the AP1 on the bands 2 and 3 because the value of the NAV is a non-idle value, thereby causing resource waste.

The WLAN structure schematic diagram and the channel access contention schematic diagram of fig. 2 and the current problems are described above in connection with fig. 1, and the method disclosed in the embodiment of the present invention is further described below. Referring to fig. 3, fig. 3 is a flowchart of a data transmission protection method according to an embodiment of the present invention, and the method may include steps S101 to S102.

S101, the station receives a trigger frame sent by an access point of its associated basic service set BSS.

In a specific embodiment, a station receives a trigger frame sent by an access point of its associated basic service set BSS. When the station detects the PPDU sent by the access point of the basic service set BSS, the station can judge whether the PPDU is a trigger frame, if so, the station receives the trigger frame.

S102, selecting an available sub-channel frequency band for data transmission from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vector NAVs set on the sub-channel frequency band of the channel transmission bandwidth of the BSS, and responding to the trigger frame.

In a specific embodiment, the station selects an available sub-channel frequency band for data transmission from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vectors NAVs set on the sub-channel frequency band of the channel transmission bandwidth of the BSS, so as to respond to the trigger frame. The NAV is used as a network allocation vector, applied to virtual carrier sensing, and may be equivalent to a counter for virtually reflecting the busy and idle of the channel. In the embodiment of the invention, at least two NAVs are arranged on the sub-channel frequency band of the channel transmission bandwidth of the BSS associated with the station, and are used for controlling the channel access competition, thereby playing a role in protecting the data transmission.

In the embodiment of the present invention, it may be agreed that a NAV value of 0 indicates that data transmission is allowed in the available sub-channel band, and that a NAV value of non-0 indicates that data transmission is not allowed in the available sub-channel band. The STA1 may maintain two types of NAVs on all sub-channel bands of a channel transmission bandwidth, including an intra-NAV and an inter-NAV, where the intra-NAV is used to maintain the NAV of the BSS, the inter-NAV is used to maintain the NAV of the OBSS and obtain current values of the intra-NAV and the inter-NAV, and if the inter-nav=0, all sub-channel bands may be selected from the channel transmission bandwidth of the BSS as available sub-channel bands, and data transmission is allowed on all sub-channel bands. It is also possible to maintain one NAV on each of at least two sub-channel bands of the entire channel transmission bandwidth or two kinds of NAVs, including an intra-NAV and an inter-NAV, on each of at least two sub-channel bands and to acquire a current value of the NAV.

In order to reduce data transmission collision and interference existing in channel access contention, a NAV is set on all sub-channel frequency bands of a channel transmission bandwidth of the BSS or on sub-channel frequency bands of each channel transmission bandwidth. To distinguish the source of the NAV, the NAV may be further divided into an intra-NAV set by the associated BSS and an inter-NAV set by the OBSS. An available sub-channel band may be selected from the sub-channel bands in the channel transmission bandwidth according to the current value of the NAV for transmission of a data frame, such as an uplink data frame. Taking two NAVs as an example on all sub-channel frequency bands of the channel transmission bandwidth, including an intra-NAV and an inter-NAV, if an inter-nav=0 is detected, it is indicated that there is no data transmission in the current OBSS that would interfere with a node of the station, such as an access point or a station, and all sub-channel frequency bands of the channel transmission bandwidth are selected as available sub-channel frequency bands, and data transmission can be allowed on the available sub-channel frequency bands.

Referring to fig. 4, fig. 4 is a flowchart of another data transmission protection method according to an embodiment of the present invention, and the method includes steps S201 to S204.

S201, two network allocation vectors NAV are set on all sub-channel bands of the channel transmission bandwidth of the basic service set BSS associated with the station, including an intra-NAV and an inter-NAV.

In a specific embodiment, two NAVs are set on all sub-channel frequency bands of a channel transmission bandwidth of a basic service set BSS associated with a station, where the intra-NAV is used to record a time length for which the station is prohibited from transmitting data on all sub-channel frequency bands of the channel transmission bandwidth by the BSS, and the inter-NAV is used to record a time length for which an OBSS monitored by the station is prohibited from transmitting data on all sub-channel frequency bands of the channel transmission bandwidth. For example, as shown in fig. 2, an intra-NAV and an inter-NAV are set on all sub-channel bands of the entire channel transmission bandwidth, and if the initial values of the intra-NAV and the inter-NAV are both 0, and if the access point AP1 of the BSS associated with the station STA1 transmits a PPDU to the STA4, the STA1 also receives the PPDU, the STA1 may obtain a duration value duration=10 in the PPDU that is not transmitted to itself, and set the intra-nav=10 according to the duration, and if the STA1 receives the PPDU of duration=4 transmitted by the STA2, the inter-nav=4 may be set. It should be noted that the intra-NAV and inter-NAV may be updated according to the received duration value of the PPDU and the source of the frame, and when the NAV is updated, the duration value needs to be greater than the current value of the corresponding NAV, for example, if STA1 receives the PPDU with duration 1=4 and the PPDU with duration 2=6 sent by STA2 and STA3 respectively at the same time, since duration2 > duration1, the inter-nav=6 may be set.

S202, when a PPDU is received, judging the source of the PPDU and judging the type of the PPDU.

In a specific implementation, when a PPDU is received, the station determines the source of the PPDU and determines the type of the PPDU. In the embodiment of the invention, the PPDU can comprise a plurality of types such as a data frame, a trigger frame, a CF-END frame and the like, and the PPDU can be sent by any node on a BSS or an OBSS, such as an access point and a station. For example, when the STA2 receives the PPDU, it obtains whether the PPDU is a trigger frame or a CF-END frame by determining a frame type field of an MAC header of the PPDU, and if the PPDU is the trigger frame, it may determine a source of the trigger frame by parsing the trigger frame through a TA field of the MAC domain; if the PPDU is a CF-END frame, the source of the CF-END frame can be judged by analyzing the BSSID field of the MAC domain of the CF-END frame.

And S203, if the PPDU is derived from an access point of a basic service set BSS associated with a station and is a trigger frame, judging whether a scheduling target of the trigger frame comprises the station.

In a specific implementation, if the PPDU is derived from an access point of a BSS associated with a station and is a trigger frame, the station determines whether a scheduling target of the trigger frame includes the station. In the embodiment of the invention, the station identifier in the resource indication information of the MAC domain of the trigger frame can be matched with the AID value configured by the AP during association to determine whether the scheduling target of the trigger frame includes the station, and if the matching is consistent, the scheduling target of the trigger frame includes the station.

And S204, when the scheduling target of the trigger frame comprises the station, if the current value of the inter-NAV set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is equal to a preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission, and confirming the transmitted frequency domain resources of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame so as to transmit the data frame on the confirmed frequency domain resources.

In a specific implementation, when the scheduling target of the trigger frame includes the station, if the current value of the inter-NAV set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is equal to the preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission, and according to the frequency domain resource scheduling information of the trigger frame, confirming the frequency domain resources of the station's transmission from the available sub-channel frequency bands, so as to perform data frame transmission on the confirmed frequency domain resources. In the embodiment of the invention, if the channel transmission bandwidth is 80MHz, all sub-channel frequency bands of the channel transmission bandwidth are 80MHz, and one intra-NAV and one inter-NAV can be set on the 80 MHz. If the rule 0 indicates that the available sub-channel frequency band allows data transmission, and the non-0 indicates that the available sub-channel frequency band does not allow data transmission, when the inter-nav=0, determining all sub-channel frequency bands of the channel transmission bandwidth as the available sub-channel frequency band, and confirming the frequency domain resource transmitted by the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame, so as to transmit the data frame on the confirmed frequency domain resource.

Taking STA2 in fig. 2 as an example, AP2 is an associated access point of STA2, when AP2 needs to schedule STA2 for data transmission, a trigger frame may be sent to STA2, where a scheduling target of the trigger frame points to STA2, STA2 determines, according to a current value of an inter-NAV of two NAVs maintained by AP2, whether all sub-channel bands of a channel transmission bandwidth are available sub-channel bands, and if inter-nav=0, selects all sub-channel bands of the channel transmission bandwidth as available sub-channel bands. The station may confirm the frequency domain resource of the transmission of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame, for example, the available sub-channel frequency bands are frequency band 2 and frequency band 3, and may confirm the frequency domain resource of the transmission of the station is 4MHz in frequency band 2 according to the 4MHz bandwidth resource in frequency band 2 required to be used in the trigger frame, and perform data frame transmission on the frequency domain resource in response to the trigger frame.

Optionally, the precondition of transmitting the data frame over the entire sub-channel band of the channel transmission bandwidth, such as the uplink data frame, further includes determining that the current signal strength is less than a channel clear assessment (CCA, clear Channel Assessment) threshold or an OBSS packet detection (OBSS packet detection level) threshold.

After executing the step S202, the station may further execute a step of updating the current value of the NAV, and in the embodiment of the present invention, the intra-NAV or the inter-NAV may be selected for updating through the source judgment of the PPDU.

And (A) optionally, if the PPDU is derived from a basic service set BSS associated with a station and the station is not a sending target of the PPDU, acquiring a duration value duration in the PPDU.

And if the current value of the intra-NAV set on all the sub-channel frequency bands of the channel transmission bandwidth is smaller than the duration, updating the current value of the intra-NAV to the duration.

In a specific implementation, if the PPDU originates from a BSS associated with a station and the PPDU is not sent to the station, the station may parse the PPDU to obtain a duration, and if the current value of the intra-NAV is smaller than the duration, may update the current value of the intra-NAV. For example, as shown in fig. 2, AP1 sends a data frame to STA4, STA1 receives the data frame, and may parse the data frame to obtain duration=10, and if at this time, intra-nav=5, the current value of intra-NAV may be updated to 10.

Optionally, if the PPDU is derived from the overlapped basic service set OBSS, a duration value duration in the PPDU is obtained.

When one inter-NAV is set in all sub-channel frequency bands, if the current value of the inter-NAV set in all sub-channel frequency bands of the channel transmission bandwidth is smaller than the duration, updating the current value of the inter-NAV to be the duration.

In a specific implementation, if the PPDU is derived from an OBSS, the station may parse the PPDU to obtain a duration, and if the current value of the inter-NAV is smaller than the duration, may update the current value of the inter-NAV. For example, as shown in fig. 2, if the AP2 sends a data frame to the STA2 and the STA1 receives the data frame, the data frame may be parsed to obtain duration=10, and if the inter-nav=5 at this time, the current value of the inter-NAV may be updated to 10.

After executing the step S202, the station may further execute a processing step on the CF-END frame, in this embodiment of the present invention, it may be determined whether the type of the data frame is a CF-END frame, if so, the current value of the intra-NAV or the current value of the inter-NAV may be updated by determining the source of the CF-END frame, and in this embodiment of the present invention, the preset value may be 0.

And (B) optionally, if the received contention-free period ending CF-END frame is sourced from the BSS, updating the current value of the intra-NAV set by the station on all sub-channel frequency bands of the channel transmission bandwidth of the BSS to a preset value.

In a specific implementation, if the CF-END frame originates from the BSS, the current value of the intra-NAV may be updated to a preset value of 0 to clear the current value of the intra-NAV.

Optionally, if the received contention-free period END CF-END frame originates from an overlapping basic service set OBSS, updating a current value of an inter-NAV set by the station on all sub-channel bands of a channel transmission bandwidth of the BSS to a preset value.

In a specific implementation, if the CF-END frame originates from the OBSS, the current value of the inter-NAV may be updated to a preset value of 0 to clear the current value of the inter-NAV.

Further optionally, if the received CF-END frame originates from an OBSS, it is determined whether the source of the current value of the inter-NAV set by the station on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is the same as the source of the CF-END frame, and if so, the current value of the inter-NAV is updated to a preset value. For example, the CF-END frame originates from OBSS2, and if the source of the current value of the inter-NAV set by the station on all sub-channel bands of the channel transmission bandwidth of the BSS is also OBSS, the current value of the inter-NAV may be updated to a preset value of 0.

In the embodiment of the invention, the station sets an intra-NAV and an inter-NAV on all sub-channel frequency bands of the channel transmission bandwidth of the associated BSS, when the PPDU is a trigger frame, the available sub-channel frequency bands for data transmission can be obtained through the current values of the intra-NAV and the inter-NAV to respond to the trigger frame, so as to realize data transmission protection.

Referring to fig. 5, fig. 5 is a flowchart of another data transmission protection method according to an embodiment of the present invention, where the method includes steps S301 to S304.

S301, respectively setting an intra-NAV and at least one inter-NAV respectively corresponding to each Overlapped Basic Service Set (OBSS) monitored on all sub-channel frequency bands of the channel transmission bandwidth of the Basic Service Set (BSS) associated with the station.

In a specific embodiment, an intra-NAV and at least one inter-NAV corresponding to each of the monitored OBSS of the basic service set are respectively set on all sub-channel frequency bands of the channel transmission bandwidth of the basic service set BSS associated with the station, where the intra-NAV is used to record a time length for which the station is prohibited from transmitting data on all sub-channel frequency bands of the channel transmission bandwidth by the BSS, and the inter-NAV is used to record a time length for which the OBSS monitored by the station are prohibited from transmitting data on all sub-channel frequency bands of the channel transmission bandwidth. For example, as shown in fig. 2, assuming that the STA1 can monitor 2 OBSS, one intra-NAV and 2 inter-NAVs may be set on all sub-channel frequency bands of the entire channel transmission bandwidth, where OBSS1 and OBSS2 respectively correspond to inter-NAV1 and inter-NAV2, and assuming that initial values of all intra-NAV and inter-NAV are 0, if the AP1 of the BSS where the STA1 is located sends PPDUs to the STA4, the STA1 also receives the PPDUs at the same time, if the duration=10 of the PPDUs is obtained by parsing, intra-nav=10 may be set, and if the STA1 receives PPDUs of duration 1=4 sent by STA2 in the OBSS1 and PPDUs 2=6 sent by STA3 in the OBSS2 at the same time, inter-NAV 1=4 and inter-NAV 2=6 may be set.

S302, when a PPDU is received, judging the source of the PPDU and judging the type of the PPDU.

In a specific implementation, step S302 of the embodiment of the present invention may refer to step S202 shown in fig. 4, and will not be described herein.

S303, if the PPDU is derived from an access point of a basic service set BSS associated with a station and is a trigger frame, judging whether a scheduling target of the trigger frame comprises the station.

In a specific implementation, step S303 of the embodiment of the present invention may refer to step S203 shown in fig. 4, and will not be described herein.

And S304, when the scheduling target of the trigger frame comprises the station, if the current value of all the inter-NAVs which are set on all the sub-channel frequency bands of the channel transmission bandwidth of the BSS and are in one-to-one correspondence with each monitored OBSS is equal to a preset value, selecting all the sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission, and confirming the transmitted frequency domain resources of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame so as to transmit the data frame on the confirmed frequency domain resources.

In a specific implementation, when the scheduling target of the trigger frame includes the station, if all the current values of the inter-NAVs set on all the sub-channel frequency bands of the channel transmission bandwidth of the BSS and one-to-one corresponding to each monitored OBSS are equal to a preset value, selecting all the sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission to respond to the trigger frame. In the embodiment of the invention, if the channel transmission bandwidth is 80MHz, all sub-channel frequency bands of the channel transmission bandwidth are 80MHz, and one intra-NAV and the same number of inter-NAVs as the monitored OBSS can be set on the 80 MHz. If the convention 0 indicates that the available sub-channel frequency band allows data transmission, the non-0 indicates that the available sub-channel frequency band does not allow data transmission, when N inter-nav=0 corresponding to all N (N is a natural number) OBSS, all sub-channel frequency bands of the channel transmission bandwidth can be determined to be available sub-channel frequency bands for data transmission, the station can pass through the available sub-channel frequency bands for data transmission, and confirm the transmitted frequency domain resources of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame, so as to send the data frame on the confirmed frequency domain resources.

Taking STA1 in fig. 2 as an example, assuming that there are two OBSS of OBSS1 and OBSS2, an inter-NAV1 and an inter-NAV2 are respectively set correspondingly, AP1 is an associated access point of STA1, when AP1 sends a trigger frame with a scheduling target of STA4 and a duration of 4, if it is assumed that the duration of the trigger frame is 4, intra-nav=4, if at this time STA2 and STA3 send data frames with duration 1=3 and duration 2=5, respectively, inter-NAV 1=3, inter-NAV 2=5, and only when inter-NAV1 and inter-NAV2 are simultaneously 0, all sub-channel bands of the channel transmission bandwidth can be selected as available sub-channel bands. The station may confirm the frequency domain resource of the transmission of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame, for example, the available sub-channel frequency bands are frequency band 2 and frequency band 3, and may confirm the frequency domain resource of the transmission of the station is 4MHz in frequency band 2 according to the 4MHz bandwidth resource in frequency band 2 required to be used in the trigger frame, and perform data frame transmission on the frequency domain resource in response to the trigger frame.

Optionally, the precondition of transmitting the data frame, such as the uplink data frame, through all sub-channel frequency bands of the channel transmission bandwidth further includes determining that the current signal strength is less than a CCA threshold or a OBSS packet detection level threshold.

After executing the step S302, the station may further execute a step of updating the current value of the NAV, and in this embodiment of the present invention, the intra-NAV or the inter-NAV may be selected for updating by determining the source of the PPDU.

Optionally, if the PPDU is derived from a basic service set BSS associated with a station and the station is not a transmission target of the PPDU, acquiring a duration value duration in the PPDU;

In a specific implementation, the steps of the embodiment of the present invention may refer to step a shown in fig. 4 after the step S202 is performed, which is not described herein.

Optionally, if the PPDU is derived from an overlapped basic service set OBSS, acquiring a duration value duration in the PPDU;

and when at least one inter-NAV corresponding to the OBSS monitored by the station is set in the all sub-channel frequency bands, if the current value of the inter-NAV corresponding to the OBSS with the same source of the PPDU of the duration is smaller than the duration, updating the inter-NAV corresponding to the OBSS with the same source of the PPDU of the duration into the duration.

In a specific implementation, if the PPDU is derived from an overlapped basic service set OBSS, the station obtains a duration value duration in the PPDU, and when the at least one inter-NAV corresponding to the OBSS monitored by the station is set in all sub-channel frequency bands, if the current value of the inter-NAV corresponding to the OBSS with the same PPDU source of the duration is smaller than the duration, the station updates the inter-NAV corresponding to the OBSS with the same PPDU source of the duration to the duration.

For example, assuming that there are 2 OBSS, the inter-NAV1 and the inter-NAV2 corresponding to the OBSS1 and the OBSS2, respectively, are set on all the sub-channel frequency bands, if the PPDU is derived from the OBSS2 and the duration=10 in the PPDU, and the current values inter-NAV 1=3 and inter-NAV 2=6 of the inter-NAV1 and the inter-NAV2 are derived from the OBSS1 and the OBSS2, since the current value of the inter-NAV2 is the same as the source of the inter-NAV2 and the inter-NAV2 < duration, the current value of the inter-NAV2 may be updated to 10 and the inter-NAV1 is not updated.

After executing the step S302, the station may further execute a processing step on the CF-END frame, in this embodiment of the present invention, it may be determined whether the PPDU is a CF-END frame, if so, the current value of the intra-NAV or the current value of the inter-NAV may be updated by determining the source of the CF-END frame, where in this embodiment of the present invention, the preset value may be 0.

Optionally, if the received contention-free period END CF-END frame originates from the BSS, the current value of the intra-NAV set by the station on all sub-channel bands of the channel transmission bandwidth of the BSS is updated to a preset value.

In a specific implementation, the steps of the embodiment of the present invention may refer to step B shown in fig. 3 after the step S202 is performed, which is not described herein.

Further optionally, if the received contention-free period END CF-END frame originates from an overlapping basic service set OBSS, the current value of an inter-NAV corresponding to the OBSS, set by the station on all sub-channel frequency bands of the channel transmission bandwidth of the BSS, where the source of the CF-END frame is the same, is updated to a preset value.

In a specific implementation, if the received CF-END frame originates from an OBSS, the current value of an inter-NAV corresponding to the OBSS, which is set by the station on all sub-channel frequency bands of the channel transmission bandwidth of the BSS and is the same as the source of the CF-END frame, is updated to a preset value. For example, the CF-END frame is derived from OBSS2, and if OBSS2 corresponds to inter-NAV2, the inter-NAV2 is updated to a preset value, and the other inter-NAVs are not updated.

The embodiment of the invention changes the setting mode of the inter-NAV from setting one inter-NAV on all sub-channel frequency bands to at least one inter-NAV corresponding to each monitored OBSS on the basis of the previous embodiment, and provides a method for clearing and updating the inter-NAV of a specific OBSS besides reducing OBSS interference and NAV false update or clearing effect.

Referring to fig. 6, fig. 6 is a flowchart of another data transmission protection method according to an embodiment of the present invention, and the method includes steps S401 to S404.

S401, setting an intra-NAV on all sub-channel frequency bands of the channel transmission bandwidth and setting an inter-NAV on each sub-channel frequency band of the channel transmission bandwidth.

In a specific embodiment, the station sets an intra-NAV on all sub-channel frequency bands of the channel transmission bandwidth, and sets an inter-NAV on each sub-channel frequency band of the channel transmission bandwidth, where the intra-NAV is used for recording a time length that the station is prohibited from transmitting data on all sub-channel frequency bands of the channel transmission bandwidth by the BSS, and the inter-NAV is used for recording a time length that an OBSS monitored by the station is prohibited from transmitting data on the sub-channel frequency band on which the inter-NAV is set. For example, as shown in fig. 2, assuming that four sub-channel bands of a band 1 to 4 are divided into the entire channel transmission bandwidth, 1 intra-NAV and 4 inter-NAV may be set in the band 1 to 4, where the bands 1 to 4 respectively set the corresponding inter-NAV1 to 4, initial values of all intra-NAV and inter-NAV are 0, if an access point AP1 of a BSS associated with a station STA1 transmits a PPDU to a STA4, the STA1 also receives the PPDU at the same time, if a duration=10 of the PPDU is obtained by parsing, the intra-nav=4 may be set, and if the STA1 simultaneously receives a PPDU of which the STA2 transmits the duration=4 and designates the sub-channel band as the band 1 to 2, the inter-nav=4 may be set.

And S402, judging the source of the PPDU and judging the type of the PPDU when the PPDU is received.

In a specific implementation, step S402 of the embodiment of the present invention may refer to step S202 shown in fig. 4, and will not be described herein.

S403, if the PPDU is derived from the access point of the basic service set BSS associated with the station and is a trigger frame, judging whether the scheduling target of the trigger frame comprises the station.

In a specific implementation, step S403 of the embodiment of the present invention may refer to step S203 shown in fig. 4, and will not be described herein.

And S404, when the scheduling target of the trigger frame comprises the station, selecting at least one sub-channel frequency band with the current value equal to a preset value of the inter-NAV as an available sub-channel frequency band for data transmission, and confirming the transmitted frequency domain resource of the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame so as to transmit the data frame on the confirmed frequency domain resource.

In a specific implementation, when the scheduling target of the trigger frame includes the station, the station selects at least one sub-channel frequency band with the current value of the inter-NAV equal to the preset value as an available sub-channel frequency band for data transmission, so as to respond to the trigger frame. In the embodiment of the invention, if the channel transmission bandwidth is 80MHz, the channel transmission bandwidth can be divided into 4 sub-channel frequency bands of 20MHz, 1 intra-NAV is set on 80MHz, and 1 inter-NAV is set on each sub-channel frequency band of 20 MHz. If the contract of 0 indicates that the available sub-channel band allows data transmission, the non-0 indicates that the available sub-channel band does not allow data transmission. The embodiment of the invention can select the available sub-channel frequency bands in two ways, wherein the first way is to select all the appointed sub-channel frequency bands as the available sub-channel frequency bands if the inter-NAV set on all the appointed sub-channel frequency bands is equal to a preset value; and the second way is to select the specified sub-channel frequency band with the inter-NAV equal to the preset value from all the specified sub-channel frequency bands as the available sub-channel frequency band, and confirm the frequency domain resource transmitted by the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame so as to send the data frame on the confirmed frequency domain resource.

Taking STA1 in fig. 2 as an example, assuming that there are four sub-channel bands of frequency bands 1-4, where initial values of all intra-NAV and inter-NAV set on the frequency bands are 0, AP1 is an associated access point of STA1, if AP1 invokes STA1 on frequency bands 2-3, it may be determined according to the first manner whether current values of inter-NAV2 and inter-NAV3 set on frequency bands 2-3 are equal to preset values, if yes, it is determined that frequency bands 2-3 are available sub-channel bands; or judging whether the current value of the inter-NAV2 and the inter-NAV3 set on the frequency bands 2-3 is equal to the preset value according to the first mode, for example, if the current value of the inter-NAV2 is equal to the preset value and the current value of the inter-NAV3 is not equal to the preset value, the frequency band 2 set on the inter-NAV2 can be selected as an available sub-channel frequency band. The station may confirm the frequency domain resource of the transmission of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame, for example, the available sub-channel frequency bands are frequency band 2 and frequency band 3, and may confirm the frequency domain resource of the transmission of the station is 4MHz in frequency band 2 according to the 4MHz bandwidth resource in frequency band 2 required to be used in the trigger frame, and perform data frame transmission on the frequency domain resource in response to the trigger frame.

Optionally, the precondition of transmitting the data frame through the sub-channel frequency band of the channel transmission bandwidth as the uplink data frame further includes determining that the current signal strength is less than the CCA threshold or the OBSS packet detection level threshold.

After the step S402 is performed, the station may further perform a step of updating the current value of the NAV, and in the embodiment of the present invention, the intra-NAV or the inter-NAV may be selected for updating through the source judgment of the PPDU.

Optionally, if the PPDU is derived from a basic service set BSS associated with a station, the PPDU is parsed to obtain a duration value duration.

And (C) optionally, if the PPDU is derived from an Overlapped Basic Service Set (OBSS), acquiring a duration value duration in the PPDU.

And when one inter-NAV is set in each sub-channel frequency band, acquiring a designated sub-channel frequency band in the PPDU, and if the current value of the inter-NAV in the designated sub-channel frequency band is smaller than the duration, updating the current value of the inter-NAV in the designated sub-channel frequency band smaller than the duration to the duration.

In a specific implementation, when one inter-NAV is set in each sub-channel band, acquiring a designated sub-channel band in the PPDU, and if the current value of the inter-NAV in the designated sub-channel band is smaller than the duration, updating the current value of the inter-NAV in the designated sub-channel band smaller than the duration to the duration. For example, the designated sub-channel band of the PPDU is band 2, if the inter-nav2=4 corresponding to band 2 and the duration=8 in the PPDU, the inter-nav2=8 is updated, and if the inter-nav2=10 corresponding to band 2, the update is not performed.

After executing the step S402, the station may further execute a processing step on the CF-END frame, in this embodiment of the present invention, it may be determined whether the PPDU is a CF-END frame, if so, the current value of the intra-NAV or the current value of the inter-NAV may be updated by determining the source of the CF-END frame, and in this embodiment of the present invention, the preset value may be 0.

In a specific implementation, the steps of the embodiment of the present invention may refer to step B shown in fig. 4 after the step S202 is performed, which is not described herein.

And step D, if the received contention-free period END CF-END frame is derived from the overlapped basic service set OBSS, acquiring a designated sub-channel frequency band in the CF-END frame, and updating the current value of the inter-NAV set on the designated sub-channel frequency band to a preset value.

In a specific implementation, if the CF-END frame originates from the OBSS, the specified sub-channel band, such as sub-channel band 1-2, may be obtained by parsing the CF-END frame, and the current value of the inter-NAV corresponding to the sub-channel band 1-2 may be updated to a preset value 0, so as to clear the current value of the inter-NAV.

And E, if the received contention-free period END CF-END frame is derived from the Overlapped Basic Service Set (OBSS), acquiring a designated sub-channel frequency band of the CF-END frame, and updating the current value of the inter-NAV set on the designated sub-channel frequency band corresponding to the OBSS with the same source of the CF-END frame to a preset value.

In a specific implementation, if the CF-END frame originates from the OBSS2, a specified sub-channel band, such as sub-channel band 1-2, may be obtained by parsing the CF-END frame, and if the current value sources of the inter-NAV1 and the inter-NAV2 on the sub-channel band 1-2 are OBSS1 and OBSS2, respectively, the current value of the inter-NAV2 may be updated to a preset value of 0 to clear the current value of the inter-NAV 2.

In the embodiment of the invention, the station sets an intra-NAV sum on all sub-channel frequency bands of the channel transmission bandwidth of the associated BSS, sets an inter-NAV on each sub-channel frequency band, and can acquire the available sub-channel frequency band in the appointed sub-channel frequency band through the current values of the intra-NAV and the inter-NAV and send a data frame to respond to the trigger frame when the PPDU is the trigger frame.

Referring to fig. 7, fig. 7 is a flowchart of another data transmission protection method according to an embodiment of the present invention, and the method includes steps S501 to S504.

S501, an intra-NAV is set on all sub-channel frequency bands of the channel transmission bandwidth, and at least one inter-NAV corresponding to each monitored overlapped basic service set OBSS is set on each sub-channel frequency band of the channel transmission bandwidth.

In a specific embodiment, the station sets an intra-NAV on all sub-channel frequency bands of the channel transmission bandwidth, and sets at least one inter-NAV corresponding to each monitored OBSS on each sub-channel frequency band of the channel transmission bandwidth, where the intra-NAV is used to record a time length that the station is forbidden by the BSS to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the inter-NAV is used to record a time length that the OBSS monitored by the station are forbidden to perform data transmission on the sub-channel frequency band set with the inter-NAV. For example, as shown in fig. 2, it is assumed that four sub-channel bands of frequency bands 1 to 4 are divided in the entire channel transmission bandwidth, two OBSS of OBSS1 and OBSS2 are provided, 1 intra-NAV and a plurality of inter-NAVs are provided in total in the frequency bands 1 to 4, wherein one inter-NAV is provided on each frequency band corresponding to OBSS1 and OBSS2, respectively, for example, inter-NAV31 and inter-NAV32 are provided on frequency band 3 corresponding to OBSS1 and OBSS2, respectively, and initial values of the intra-NAV and inter-NAV are all 0. If the access point AP1 of the BSS associated with the STA1 transmits PPDU to the STA4, the STA1 may receive the PPDU and parse the PPDU to obtain the duration=10, the intra-nav=4 may be set, if the STA1 receives the PPDU with the duration=4 sent by the STA2 in the OBSS1 and the sub-channel frequency band designated as the frequency band 1-2, the inter-NAV 11=4 and the inter-NAV 21=4 may be set, and if the STA1 receives the PPDU with the duration=5 sent by the STA3 in the OBSS2 and the sub-channel frequency band designated as the frequency band 1-3, the inter-NAV 12=5, the inter-NAV 22=5 and the inter-NAV 32=5 may be set.

S502, when a PPDU is received, judging the source of the PPDU and judging the type of the PPDU.

In a specific implementation, step S502 of the embodiment of the present invention may refer to step S202 shown in fig. 4, and will not be described herein.

S503, if the PPDU is derived from the access point of the basic service set BSS associated with the station and is a trigger frame, judging whether the scheduling target of the trigger frame comprises the station.

In a specific implementation, step S503 of the embodiment of the present invention may refer to step S203 shown in fig. 4, and will not be described herein.

And S504, when the scheduling target of the trigger frame comprises the station, if at least one sub-channel frequency band exists, the current value of all the set inter-NAVs is equal to a preset value, the at least one sub-channel frequency band is selected as an available sub-channel frequency band for data transmission, and according to the frequency domain resource scheduling information of the trigger frame, the frequency domain resource of the station is confirmed from the available sub-channel frequency band, so that the data frame is sent on the confirmed frequency domain resource.

In a specific implementation, when the scheduling target of the trigger frame includes the station, if at least one sub-channel band exists, the current values of all the inter-NAVs set by the station are equal to a preset value, and the at least one sub-channel band is selected as an available sub-channel band to respond to the trigger frame. In the embodiment of the present invention, if there are two OBSS, namely OBSS1 and OBSS2, and the channel transmission bandwidth is 80MHz, the channel transmission bandwidth may be divided into 4 sub-channel frequency bands of 20MHz, an intra-NAV is set at 80MHz, and an inter-NAV31 and an inter-NAV32 corresponding to OBSS1 and OBSS2 respectively are set on each sub-channel frequency band of 20MHz, such as frequency band 3. If the contract of 0 indicates that the available sub-channel band allows data transmission, the non-0 indicates that the available sub-channel band does not allow data transmission. The embodiment of the invention can select the available sub-channel frequency bands in two ways, wherein the first way is to select all the appointed sub-channel frequency bands as the available sub-channel frequency bands if all the inter-NAVs arranged on all the appointed sub-channel frequency bands are equal to a preset value; and the second way is that if at least one appointed sub-channel frequency band exists in all the appointed sub-channel frequency bands, all the inter-NAVs set on the appointed sub-channel frequency bands are equal to a preset value, the appointed sub-channel frequency bands can be selected as available sub-channel frequency bands, and according to the frequency domain resource scheduling information of the trigger frame, the frequency domain resources of the transmission of the station are confirmed from the available sub-channel frequency bands, so that data frame transmission is carried out on the confirmed frequency domain resources.

Taking STA1 in fig. 2 as an example, assuming that two OBSS, namely OBSS1 and OBSS2, exist, and frequency bands 1 to 4 are four sub-channel frequency bands, initial values of all intra-NAVs and inter-NAVs set on the frequency bands are all 0, AP1 is an associated access point of STA1, if AP1 calls STA1 on frequency bands 2 to 3, it can be determined according to a first manner whether current values of inter-NAV21, inter-NAV22, inter-NAV31 and inter-NAV32 set on frequency bands 2 to 3 are equal to preset values, if yes, determining that frequency bands 2 to 3 are available sub-channel frequency bands; or judging whether the inter-NAV21 and the inter-NAV22 set on the frequency bands 2 to 3 are equal to a preset value and whether the current values of the inter-NAV31 and the inter-NAV32 are equal to the preset value according to the first mode, if the current values of the inter-NAV21 and the inter-NAV22 set on the frequency band 2 are equal to the preset value and the current values of the inter-NAV31 and the inter-NAV32 set on the frequency band 3 are not equal to the preset value, selecting the frequency band 2 as an available sub-channel frequency band. The station may confirm the frequency domain resource of the transmission of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame, for example, the available sub-channel frequency bands are frequency band 2 and frequency band 3, and may confirm the frequency domain resource of the transmission of the station is 4MHz in frequency band 2 according to the 4MHz bandwidth resource in frequency band 2 required to be used in the trigger frame, and perform data frame transmission on the frequency domain resource in response to the trigger frame.

After executing the step S502, the station may further execute a step of updating the current value of the NAV, and in this embodiment of the present invention, the intra-NAV or the inter-NAV may be selected for updating by determining the source of the PPDU.

Optionally, if the PPDU is derived from a basic service set BSS associated with a station and the station is not a transmission target of the PPDU, a duration value duration in the PPDU is obtained.

Step F, if the PPDU is from the Overlapped Basic Service Set (OBSS), acquiring a duration value duration in the PPDU;

In a specific implementation, for example, the station may monitor OBSS1 and OBSS2, and assume that the PPDU is from OBSS1 and the designated sub-channel band is band 4, 2 inter-NAVs are set on band 4, and inter-NAV 41=4 and inter-NAV 42=10, when duration=8 in the PPDU, the inter-NAV 41=8 smaller than the duration may be updated, and the inter-NAV42 is not updated on other bands.

After executing the step S502, the station may further execute a processing step on the CF-END frame, in this embodiment of the present invention, it may be determined whether the PPDU is a CF-END frame, if so, the current value of the intra-NAV or the current value of the inter-NAV may be updated by determining the source of the CF-END frame, and in this embodiment of the present invention, the preset value may be 0.

And (G) optionally, if the received contention-free period ending CF-END frame is derived from the Overlapped Basic Service Set (OBSS), acquiring designated sub-channel frequency bands in the CF-END frame, and updating the current values of all inter-NAVs which are respectively set on each designated sub-channel frequency band and are in one-to-one correspondence with the OBSS with the same source of the CF-END frame to a preset value.

In a specific implementation, if the CF-END frame originates from the OBSS, a specified sub-channel band, such as band 4, may be obtained by parsing the CF-END frame, and if the CF-END frame originates from OBSS2, the OBSS2 corresponds to the inter-NAV42 on band 4, the current value of the inter-NAV42 may be updated to a preset value of 0, so as to clear the current value of the inter-NAV.

In the embodiment of the invention, the station sets an intra-NAV and an inter-NAV corresponding to each monitored OBSS on each sub-channel frequency band of the channel transmission bandwidth of the associated BSS, and provides a method for clearing and updating the inter-NAV of the specific OBSS on each sub-channel frequency band besides reducing the OBSS interference and NAV false update or clearing effect.

Referring to fig. 8, fig. 8 is a flowchart of another data transmission protection method according to an embodiment of the present invention, and the method includes steps S601 to S604.

S601, two network allocation vectors NAVs including an intra-NAV and an inter-NAV are respectively set on each sub-channel band on the channel transmission bandwidth.

In a specific embodiment, the station sets two network allocation vectors NAV in each sub-channel band on the channel transmission bandwidth, including an intra-NAV and an inter-NAV, where the intra-NAV is used for recording a time length for which the station is prohibited by the BSS to perform data transmission in the sub-channel band set with the intra-NAV, and the inter-NAV is used for recording a time length for which the OBSS monitored by the station is prohibited to perform data transmission in the sub-channel band set with the inter-NAV. For example, as shown in fig. 2, assuming that four sub-channel bands 1 to 4 are divided into the entire channel transmission bandwidth, 4 intra-NAVs and 4 inter-NAVs are set on each band, the initial values are all 0, if the access point AP1 of the BSS associated with the station STA1 transmits PPDUs to the STA4, the STA1 also receives the PPDUs at the same time, if the duration=10 of the PPDUs is obtained by parsing, the sub-channel band is designated as the band 1 to 2, the intra-nav1=4 and the intra-nav2=4 may be set, and if the STA1 simultaneously receives the PPDUs in the OBSS in which the STA2 transmits the duration=4 and the sub-channel band is designated as the band 3 to 4, the inter-nav3=4 may be set.

S602, when a PPDU is received, judging the source of the PPDU and judging the type of the PPDU.

In a specific implementation, step S602 in the embodiment of the present invention may refer to step S202 shown in fig. 4, and will not be described herein.

And S603, if the PPDU is derived from an access point of a basic service set BSS associated with a station and is a trigger frame, judging whether a scheduling target of the trigger frame comprises the station.

In a specific implementation, step S603 in the embodiment of the present invention may refer to step S203 shown in fig. 4, and will not be described herein.

And S604, when the scheduling target of the trigger frame comprises the station, selecting at least one sub-channel frequency band with the current value equal to a preset value of the inter-NAV as an available sub-channel frequency band for data transmission, and confirming the transmitted frequency domain resource of the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame so as to transmit the data frame on the confirmed frequency domain resource.

In a specific implementation, step S604 of the embodiment of the present invention may refer to step S404 shown in fig. 6, and will not be described herein.

After executing the step S602, the station may further execute a step of updating the current value of the NAV, and in this embodiment of the present invention, the intra-NAV or the inter-NAV may be selected for updating by determining the source of the data frame.

And (H) optionally, if the PPDU is derived from a basic service set BSS associated with a station and the station is not a sending target of the PPDU, acquiring a duration value duration in the PPDU.

In a specific implementation, a specific sub-channel band, such as band 1-2, is obtained by parsing the PPDU, and if intra-nav1=2, intra-nav2=5, and duration=4 of the PPDU in band 1-2, the value of intra-NAV1 may be updated to 4, and intra-NAV on intra-NAV2 and other bands may not be updated.

Optionally, if the PPDU is derived from the overlapped basic service set OBSS, the PPDU is parsed to obtain the duration value duration.

In a specific implementation, the steps of the embodiment of the present invention may refer to step C shown in fig. 6 after the step S402 is performed, which is not described herein.

After executing the step S602, the station may further execute a processing step on the CF-END frame, in this embodiment of the present invention, it may be determined whether the PPDU is a CF-END frame, if so, the current value of the intra-NAV or the current value of the inter-NAV may be updated by determining the source of the CF-END frame, where in this embodiment of the present invention, the preset value may be 0.

And (I) optionally, if the received CF-END frame is sourced from the BSS, acquiring a designated sub-channel frequency band in the CF-END frame, and updating the current value of the intra-NAV set by the station on the designated sub-channel frequency band to a preset value.

In a specific implementation, for example, the frequency bands 1 to 4 correspond to intra-NAV1 to 4 respectively, if the received CF-END frame originates from the BSS, the specified sub-channel frequency band in the CF-END frame is obtained as the frequency band 1 to 2, and the current value of intra-NAV1 to 2 can be updated to 0, so as to clear the current value of intra-NAV1 to 2.

Optionally, if the received contention-free period END CF-END frame originates from an overlapping basic service set OBSS, a designated sub-channel band in the CF-END frame is obtained, and a current value of an inter-NAV set on the designated sub-channel band is updated to a preset value.

In a specific implementation, the steps of the embodiment of the present invention may refer to step D shown in fig. 6 after the step S402 is performed, which is not described herein.

Further optionally, if the received CF-END frame originates from an OBSS, acquiring a designated sub-channel band in the CF-END frame, determining whether a source of a current value of an inter-NAV set by the station on the designated sub-channel band is the same as a source of the CF-END frame, and if so, updating the current value of the inter-NAV to a preset value.

Assuming that there are two OBSS, if the CF-END frame originates from OBSS2 and the designated sub-channel band is 2 to 3, the current values of the corresponding inter-NAV2 and inter-NAV3 originate from OBSS1 and OBSS2, respectively, so the current value of inter-NAV3 can be updated to a preset value of 0, and the current value of inter-NAV2 is not updated. In the embodiment of the invention, the station sets an intra-NAV and an inter-NAV on each sub-channel frequency band of the channel transmission bandwidth of the associated BSS, and compared with the embodiment in FIG. 6, the embodiment has the effect of reducing OBSS interference and NAV false update or cleaning, and also provides a cleaning and updating method for the intra-NAV on a specific frequency band.

Referring to fig. 9, fig. 9 is a flowchart of another data transmission protection method according to an embodiment of the present invention, and the method includes steps S701 to S704.

S701, an intra-NAV and at least one inter-NAV corresponding to the monitored overlapped basic service set OBSS are respectively set in each sub-channel frequency band on the channel transmission bandwidth.

In a specific embodiment, the station sets an intra-NAV and at least one inter-NAV corresponding to the monitored overlapped basic service set OBSS in a one-to-one correspondence to each sub-channel band on the channel transmission bandwidth, where the intra-NAV is used for recording a time length that the station is prohibited by the BSS to perform data transmission on the sub-channel band on which the intra-NAV is set, and the inter-NAV is used for recording a time length that the OBSS monitored by the station are prohibited to perform data transmission on the sub-channel band on which the inter-NAV is set. For example, as shown in fig. 2, assuming that four sub-channel bands 1 to 4 are divided into the entire channel transmission bandwidth, 4 intra-NAVs and 2 inter-NAVs are set on each band, the initial value is 0, if the access point AP1 of the BSS associated with the station STA1 transmits PPDUs to the STA4, the STA1 also receives the PPDUs at the same time, if the duration=10 of the PPDUs is obtained by parsing, the sub-channel band is designated as band 1 to 2, the intra-nav1=4, the intra-nav2=4 may be set, the intra-nav2=4, if the STA1 receives the PPDUs in the OBSS1, the STA2 transmits the duration=4, the inter-nav41=4 may be set, and if the STA1 receives the PPDUs in the OBSS2, the sub-channel band is designated as band 2 to 3, the inter-nav22=7, and the inter-nav32=7.

S702, when receiving the PPDU, judging the source of the PPDU and judging the type of the PPDU.

In a specific implementation, step S702 of the embodiment of the present invention may refer to step S202 shown in fig. 4, and will not be described herein.

S703, if the PPDU originates from the access point of the basic service set BSS associated with the station and is a trigger frame, judging whether the scheduling target of the trigger frame comprises the station.

In a specific implementation, step S703 of the embodiment of the present invention may refer to step S203 shown in fig. 4, and will not be described herein.

And S704, when the scheduling target of the trigger frame comprises the station, if at least one sub-channel frequency band exists, the current value of all the set inter-NAVs is equal to a preset value, the at least one sub-channel frequency band is selected as an available sub-channel frequency band for data transmission, and according to the frequency domain resource scheduling information of the trigger frame, the frequency domain resource of the station is confirmed from the available sub-channel frequency band, so that the data frame is sent on the confirmed frequency domain resource.

In a specific implementation, step S704 of the embodiment of the present invention may refer to step S504 shown in fig. 7, and will not be described herein.

After executing the step S702, the station may further execute a step of updating the current value of the NAV, and in the embodiment of the present invention, the intra-NAV or the inter-NAV may be selected for updating through the source judgment of the PPDU.

Optionally, if the PPDU is derived from a basic service set BSS associated with a station, and the station is not a transmission target of the PPDU, acquiring a duration value duration in the PPDU;

In a specific implementation, the steps of the embodiment of the present invention may refer to step H shown in fig. 4 after the step S602 is performed, which is not described herein.

In a specific implementation, the steps of the embodiment of the present invention may refer to step F shown in fig. 4 after the step S502 is executed, which is not described herein.

After executing the step S702, the station may further execute a processing step on the CF-END frame, in this embodiment of the present invention, it may be determined whether the PPDU is a CF-END frame, if so, the current value of the intra-NAV or the current value of the inter-NAV may be updated by determining the source of the CF-END frame, and in this embodiment of the present invention, the preset value may be 0.

Optionally, if the received contention-free period END CF-END frame originates from the BSS, acquiring a designated sub-channel band in the CF-END frame, and updating a current value of the intra-NAV set by the station on the designated sub-channel band to a preset value.

In a specific implementation, the steps of the embodiment of the present invention may refer to step I shown in fig. 6 after the step S602 is performed, which is not described herein.

Optionally, if the received contention-free period END CF-END frame originates from an overlapping basic service set OBSS, acquiring designated sub-channel bands in the CF-END frame, and updating current values of all inter-NAVs, which are set on each designated sub-channel band and correspond to OBSS with the same source of the CF-END frame, to preset values.

In a specific implementation, the steps of the embodiment of the present invention may refer to step G shown in fig. 6 after the step S502 is executed, which is not described herein.

In the embodiment of the invention, the station sets an intra-NAV and a plurality of inter-NAVs on each sub-channel frequency band of the channel transmission bandwidth of the associated BSS, and compared with the embodiment in fig. 7, the embodiment has the effect of reducing OBSS interference and NAV false update or cleaning, and also provides a method for cleaning and updating inter-NAVs on specific frequency bands and different OBSS.

Referring to fig. 10, fig. 10 is a flowchart of another data transmission protection method according to an embodiment of the present invention, where the method includes steps S801 to S804.

S801, a NAV is set on each sub-channel band of the channel transmission bandwidth.

In a specific embodiment, a NAV is set on each sub-channel frequency band of the channel transmission bandwidth, where the NAV is used to record a length of time that the station is prohibited from transmitting data on the sub-channel frequency band on which the NAV is set by other stations or access points except the station. For example, as shown in fig. 2, assuming that four sub-channel bands 1 to 4 are divided into the entire channel transmission bandwidth, one NAV is set in each of the bands 1 to 4, that is, 4 NAVs are set in total, the initial value of the NAV is 0, if the access point AP1 of the BSS associated with the station STA1 transmits a PPDU to the STA4, the STA1 receives the PPDU at the same time, if the duration=10 of the PPDU is obtained by parsing, the sub-channel band is designated as the band 1 to 2, nav2=10 may be set, and if the nav1=10, the STA1 receives the PPDU transmitted by the STA2 and the sub-channel band is designated as the band 1, and since the duration is smaller than the value of the current NAV, the value of the NAV1 is not set.

S802, when a PPDU is received, judging the source of the PPDU and judging the type of the PPDU.

In a specific implementation, step S802 of the embodiment of the present invention may refer to step S202 shown in fig. 4, and will not be described herein.

S803, if the PPDU originates from an access point of a basic service set BSS associated with a station and is a trigger frame, judging whether a scheduling target of the trigger frame comprises the station.

In a specific implementation, step S803 of the embodiment of the present invention may refer to step S203 shown in fig. 4, and will not be described herein.

And S804, when a trigger frame sent by an access point of a Basic Service Set (BSS) associated with a station is received, selecting at least one sub-channel frequency band with the current value equal to a preset value as an available sub-channel frequency band for data transmission, and confirming the frequency domain resource of the station transmission from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame so as to send the data frame on the confirmed frequency domain resource.

In a specific implementation, when a trigger frame sent by an access point of a basic service set BSS associated with a station is received, at least one sub-channel frequency band with a current value equal to a preset value of the NAV is selected as an available sub-channel frequency band for data transmission, and the trigger frame is responded. In the embodiment of the invention, assuming that the channel transmission bandwidth is 80MHz, the channel transmission bandwidth can be divided into 4 sub-channel frequency bands of 20MHz, a NAV is set on each sub-channel frequency band, and if 0 is agreed to indicate that the available sub-channel frequency band allows data transmission, the non-0 indicates that the available sub-channel frequency band does not allow data transmission. The embodiment of the invention can select the available sub-channel frequency bands in two ways, wherein the first way is to select all the appointed sub-channel frequency bands as the available sub-channel frequency bands if the inter-NAV set on all the appointed sub-channel frequency bands is equal to a preset value; the second way is to select the specified sub-channel frequency band with the inter-NAV equal to the preset value as the available sub-channel frequency band if the specified sub-channel frequency band exists in all the specified sub-channel frequency bands, and confirm the transmitted frequency domain resource of the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame, so as to transmit the data frame on the confirmed frequency domain resource

Taking STA1 in fig. 2 as an example, assuming that there are four sub-channel bands of frequency bands 1 to 4, initial values of 4 NAVs set on each frequency band are all 0, AP1 is an associated access point of STA1, if AP1 invokes STA1 on frequency bands 2 to 3, it can be determined according to the first mode whether current values of NAV2 and NAV3 set on frequency bands 2 to 3 are equal to preset values, if yes, it is determined that frequency bands 2 to 3 are available sub-channel bands; or judging whether the current value of the NAV2 and the NAV3 set on the bands 2 to 3 is equal to a preset value according to the first mode, for example, if the current value of the NAV2 is equal to the preset value and the current value of the NAV3 is not equal to the preset value, the band 2 in which the NAV2 is set may be selected as the available sub-channel band. The station may confirm the frequency domain resource of the transmission of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame, for example, the available sub-channel frequency bands are frequency band 2 and frequency band 3, and may confirm the frequency domain resource of the transmission of the station is 4MHz in frequency band 2 according to the 4MHz bandwidth resource in frequency band 2 required to be used in the trigger frame, and perform data frame transmission on the frequency domain resource in response to the trigger frame.

In another embodiment, when a trigger frame sent by an access point of a basic service set BSS associated with a station is received, at least one sub-channel band from which the current value of the NAV originates from the BSS is selected as an available sub-channel band and a data frame is sent in response to the trigger frame.

In a specific implementation, when a trigger frame sent by an access point of a basic service set BSS associated with a station is received, the station selects at least one sub-channel frequency band from which the current value of the NAV originates from the BSS as an available sub-channel frequency band and sends a data frame in response to the trigger frame. In the embodiment of the present invention, assuming that the channel transmission bandwidth is 80MHz, the channel transmission bandwidth may be divided into 4 sub-channel frequency bands of 20MHz, one NAV is set on each sub-channel frequency band, if 0 is agreed to indicate that the available sub-channel frequency band allows data transmission, and if 0 is not agreed to indicate that the available sub-channel frequency band does not allow data transmission, for example, if there are four frequency bands 1 to 4 in total, four NAVs 1 to 4 are correspondingly set, and if current values of NAV1 and NAV2 are derived from an associated BSS, current values of NAV3 and NAV4 are derived from an OBSS, the frequency bands 1 to 2 where NAV1 and NAV2 are set are selected as available sub-channel frequency bands.

After executing the step S802, the station may further execute a step of updating the current value of the NAV, and in this embodiment of the present invention, it may be determined whether to update the NAV corresponding to the specified sub-channel band through the source of the PPDU.

Optionally, when the PPDU is derived from an overlapping basic service set OBSS or when the PPDU is derived from a basic service set BSS associated with a station and the station is not a transmission target of the PPDU, acquiring a designated sub-channel frequency band and a duration value duration in the PPDU, and if a designated sub-channel frequency band with a current value of a NAV smaller than the duration exists in the designated sub-channel frequency band, updating the current value of the NAV smaller than the duration in the designated sub-channel frequency band to the duration.

In a specific implementation, for example, as shown in fig. 2, the PPDU acquired by STA1 is derived from STA2, or the PPDU acquired by STA1 is derived from AP1 but the transmission target does not include STA1, the designated sub-channel band may be acquired according to the PPDU as bands 1 to 2, duration=5, and if the current values of NAVs corresponding to the designated sub-channel band are nav1=3 and nav2=6, respectively, NAV1 may be updated to 5. If the PPDU is transmitted by the BSS associated with STA1 and the transmission destination is STA1, no update is performed.

After performing the above step S802, the station may further perform a processing step on the CF-END frame, and the preset value may be 0.

Optionally, if the received PPDU is a CF-END frame, acquiring a designated sub-channel band in the CF-END frame, and if a source of a current value of a NAV set on the designated sub-channel band is consistent with a source of the CF-END frame, updating the current value of the NAV to a preset value.

In a specific implementation, as shown in fig. 2, if the CF-END frame obtained by STA1 is derived from OBSS1, and the sub-channel frequency band is designated as frequency bands 1 to 3, and assuming that the current values of NAV1 and NAV2 are also derived from OBSS1 and the current value of NAV3 is derived from the associated BSS, the current values of NAV1 and NAV2 may be updated to a preset value of 0 to clear the current value of NAV.

The above embodiment may be extended to a process of receiving a CF-END frame under the condition that one NAV is set on the entire bandwidth, when one NAV is set on the entire bandwidth, if the CF-END frame is received and derived from an OBSS, determining whether the source OBSS of the CF-END frame is consistent with the OBSS from which the current value of the NAV is derived, and if so, updating the current value of the NAV to a preset value of 0 to clear the current value of the NAV; if not, the current value of NAV is not updated. For example, assuming that the CF-END frame is derived from OBSS2 and the current NAV is also derived from OBSS2, the current NAV may be updated to a preset value of 0.

In the embodiment of the invention, the station sets one NAV on each sub-channel frequency band of the channel transmission bandwidth of the associated BSS, and can acquire the available sub-channel frequency band in the appointed sub-channel frequency band through the current value of the NAV on each frequency band to send the uplink data frame for data transmission protection.

Referring to fig. 11, fig. 11 is a schematic diagram of a data transmission protection device according to an embodiment of the invention. As shown in fig. 7, the apparatus may include a receiving unit 11, a responding unit 12, a setting unit 13, a confirming unit 14, a first judging unit 15, a second judging unit 16, a parsing unit 17, a first updating unit 18, and a second updating unit 19, wherein:

a receiving unit 11, configured to receive a trigger frame sent by an access point of a basic service set BSS associated with a station.

A response unit 12, configured to select an available sub-channel band for data transmission from the channel transmission bandwidths of the BSS according to the current values of at least two network allocation vectors NAVs set on the sub-channel bands of the channel transmission bandwidths of the BSS, in response to the trigger frame.

Optionally, the response unit 12 is configured to, if the scheduling target of the trigger frame includes the station, select an available sub-channel band for data transmission from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vectors NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS, so as to respond to the trigger frame.

In another embodiment, the response unit 12 is specifically configured to, when one inter-NAV is set on all sub-channel frequency bands of the channel transmission bandwidth, select all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission in response to the trigger frame if a current value of the inter-NAV set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is equal to a preset value.

Optionally, when at least one inter-NAV corresponding to each monitored OBSS is set on all sub-channel frequency bands of the channel transmission bandwidth, the response unit 12 is specifically configured to select all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission to respond to the trigger frame if current values of all inter-NAVs corresponding to each monitored OBSS set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS are equal to preset values.

Optionally, the response unit 12 is specifically configured to select, when an inter-NAV is set on each sub-channel frequency band of the channel transmission bandwidth, at least one sub-channel frequency band with a current value of the inter-NAV equal to a preset value as an available sub-channel frequency band for data transmission, so as to respond to the trigger frame.

Optionally, when at least one inter-NAV corresponding to each monitored overlapped basic service set OBSS is set on each sub-channel frequency band of the channel transmission bandwidth, the response sub-unit 11 is specifically configured to select the at least one sub-channel frequency band as an available sub-channel frequency band for data transmission in response to the trigger frame if at least one sub-channel frequency band exists, where the current value of all the set inter-NAVs is equal to a preset value.

Optionally, the response subunit 11 is configured to select at least one sub-channel band with the current value of the NAV equal to the preset value as an available sub-channel band for data transmission, in response to the trigger frame.

Optionally, the response subunit 11 is configured to select at least one sub-channel band from which the current value of the NAV originates from the BSS as an available sub-channel band for data transmission, in response to the trigger frame.

In another embodiment, the setting unit 13 is configured to set two network allocation vectors NAV, including an intra-NAV and an inter-NAV, on all sub-channel bands of a channel transmission bandwidth of the basic service set BSS associated with the station. The intra-NAV is used for recording the time length of the station which is forbidden by the BSS to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the inter-NAV is used for recording the time length of the OBSS monitored by the station which is forbidden to perform data transmission on the sub-channel frequency bands set with the inter-NAV.

Optionally, the setting unit 13 is configured to set an intra-NAV and at least one inter-NAV corresponding to each of the monitored overlapped basic service sets OBSS on all sub-channel frequency bands of the channel transmission bandwidths of the basic service sets BSS associated with the station. The intra-NAV is used for recording the time length of the station which is forbidden by the BSS to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the inter-NAV is used for recording the time length of the OBSS monitored by the station which is forbidden to perform data transmission on the sub-channel frequency bands set with the inter-NAV.

Optionally, the setting unit 13 is configured to set an intra-NAV on all sub-channel frequency bands of the channel transmission bandwidth and set an inter-NAV on each sub-channel frequency band of the channel transmission bandwidth. The intra-NAV is used for recording the time length of the station which is forbidden by the BSS to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the inter-NAV is used for recording the time length of the OBSS monitored by the station which is forbidden to perform data transmission on the sub-channel frequency bands set with the inter-NAV.

Optionally, the setting unit 13 is configured to set an intra-NAV on all sub-channel frequency bands of the channel transmission bandwidth, and set at least one inter-NAV corresponding to each of the monitored overlapped basic service sets OBSS on each sub-channel frequency band of the channel transmission bandwidth. The intra-NAV is used for recording the time length of the station which is forbidden by the BSS to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the inter-NAV is used for recording the time length of the OBSS monitored by the station which is forbidden to perform data transmission on the sub-channel frequency bands set with the inter-NAV.

Optionally, the setting unit 13 is configured to set two network allocation vectors NAV, including an intra-NAV and an inter-NAV, on each sub-channel band of the channel transmission bandwidth. Wherein the intra-NAV is used for recording the time length of the station prohibited by the BSS from transmitting data on the sub-channel frequency band in which the intra-NAV is set, and the inter-NAV is used for recording the time length of the OBSS heard by the station prohibited from transmitting data on the sub-channel frequency band in which the inter-NAV is set.

Optionally, the setting unit 13 is configured to set at least one intra-NAV and at least one inter-NAV that corresponds to the monitored overlapped basic service set OBSS one-to-one on each sub-channel frequency band of the channel transmission bandwidth. Wherein the intra-NAV is used for recording the time length of the station prohibited by the BSS from transmitting data on the sub-channel frequency band in which the intra-NAV is set, and the inter-NAV is used for recording the time length of the OBSS heard by the station prohibited from transmitting data on the sub-channel frequency band in which the inter-NAV is set.

Optionally, the setting unit 13 is configured to set a NAV on each sub-channel frequency band of the channel transmission bandwidth. Wherein the NAV is used to record a length of time that the station is prohibited from transmitting data on a subchannel band in which the NAV is set by other stations or access points other than the station.

When an inter-NAV is set on all sub-channel frequency bands of the channel transmission bandwidth, if the current value of the inter-NAV set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is equal to a preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission to respond to the trigger frame. When at least one inter-NAV corresponding to each monitored OBSS is set on all sub-channel frequency bands of the channel transmission bandwidth, if the current value of all inter-NAVs corresponding to each monitored OBSS set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is equal to a preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission in response to the trigger frame.

In another embodiment, the confirmation unit 14 is configured to confirm, after selecting the available sub-channel frequency band, the frequency domain resource of the transmission of the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame, so as to perform data frame transmission on the confirmed frequency domain resource.

In another embodiment, the first determining unit 15 is configured to determine, when a PPDU is received, a source of the PPDU and determine a type of the PPDU.

In another embodiment, the second determining unit 16 is configured to determine whether the scheduling target of the trigger frame includes the station if the PPDU is derived from an access point of the basic service set BSS associated with the station and is a trigger frame.

In another embodiment, the parsing unit 17 is configured to obtain the duration value duration in the PPDU if the PPDU is derived from a basic service set BSS associated with a station and the station is not a transmission target of the PPDU.

Optionally, the parsing unit 17 is configured to obtain a duration value duration in the PPDU if the PPDU is derived from an overlapped basic service set OBSS.

In another embodiment, the first updating unit 18 is configured to update the current value of the intra-NAV to the duration if the current value of the intra-NAV set on all sub-channel bands of the channel transmission bandwidth is smaller than the duration.

Optionally, the first updating unit 18 is configured to obtain a designated sub-channel band in the PPDU, and update the current value of the intra-NAV to the duration if the current value of the intra-NAV set on the designated sub-channel band is less than the duration.

Optionally, the first updating unit 18 is configured to, when the entire sub-channel band sets an inter-NAV, update the current value of the inter-NAV with the duration if the duration is greater than the current value of the inter-NAV set on the entire sub-channel band of the channel transmission bandwidth.

Optionally, the first updating unit 18 is configured to update the current value of the inter-NAV to the duration if the current value of the inter-NAV set on all the sub-channel frequency bands of the channel transmission bandwidth is smaller than the duration when the entire sub-channel frequency bands are set to one inter-NAV.

Optionally, when the at least one inter-NAV corresponding to the OBSS monitored by the station is set in the all sub-channel bands, the first updating unit 18 is configured to update the inter-NAV corresponding to the OBSS having the same PPDU source of the duration to the duration if the current value of the inter-NAV corresponding to the OBSS having the same PPDU source of the duration is smaller than the duration.

Optionally, the first updating unit 18 is configured to obtain a designated sub-channel band in the PPDU when one inter-NAV is set for each sub-channel band, and update the current value of the inter-NAV in the designated sub-channel band smaller than the duration to the duration if the current value of the inter-NAV in the designated sub-channel band is smaller than the duration.

Optionally, the first updating unit 18 is configured to obtain a designated sub-channel frequency band in the PPDU when each monitored OBSS on each sub-channel frequency band corresponds to an inter-NAV, and update, if an inter-NAV corresponding to the OBSS from which the PPDU originates exists in the designated sub-channel frequency band, a current value of the inter-NAV set on the target designated sub-channel frequency band, which is smaller than the duration and corresponds to the OBSS from which the PPDU originates, to the duration.

Optionally, the first updating unit 18 is configured to obtain a designated sub-channel band and a duration value duration in the PPDU when the PPDU is derived from an overlapping basic service set OBSS or when the PPDU is derived from a basic service set BSS associated with a station and the station is not a transmission target of the PPDU, and update, if a designated sub-channel band having a current value of NAV smaller than the duration in the designated sub-channel band is present in the designated sub-channel band, the current value of NAV smaller than the duration in the designated sub-channel band to the duration.

In another embodiment, the second updating unit 19 is configured to update the current value of the intra-NAV set by the station on all sub-channel bands of the channel transmission bandwidth of the BSS to a preset value if the received contention-free period END CF-END frame originates from the BSS.

Optionally, the second updating unit 19 is configured to obtain a specified sub-channel band in the CF-END frame if the received contention-free period END CF-END frame originates from the BSS, and update a current value of the intra-NAV set by the station on the specified sub-channel band to a preset value.

Optionally, the second updating unit 19 is configured to update the current value of the inter-NAV set by the station on the all sub-channel frequency bands to a preset value if the received contention-free period END CF-END frame is derived from the overlapped basic service set OBSS.

Optionally, the second updating unit 19 is configured to update the current value of the inter-NAV, which is the same as the source of the CF-END frame, to a preset value on the entire sub-channel band by the station if the received contention-free period END CF-END frame is derived from the overlapped basic service set OBSS.

Optionally, the second updating unit 19 is configured to obtain a designated sub-channel band in the CF-END frame if the received contention-free period END CF-END frame originates from an overlapping basic service set OBSS, and update a current value of an inter-NAV set on the designated sub-channel band to a preset value.

Optionally, the second updating unit 19 is configured to obtain a designated sub-channel band in the CF-END frame if the received contention-free period END CF-END frame originates from an overlapping basic service set OBSS, and update a current value of an inter-NAV set on the designated sub-channel band corresponding to the OBSS from which the CF-END frame originates to a preset value.

Optionally, the second updating unit 19 is configured to obtain a designated sub-channel band in the CF-END frame if the received contention-free period END CF-END frame originates from an overlapping basic service set OBSS, and update current values of all inter-NAVs set on each designated sub-channel band and corresponding to the OBSS with the same source of the CF-END frame to a preset value.

Optionally, the second updating unit 19 is configured to obtain a specified sub-channel band in the CF-END frame if the received PPDU is a contention-free period ending CF-END frame, and update the current value of the NAV to a preset value if the source of the current value of the NAV set in the specified sub-channel band is consistent with the source of the CF-END frame.

For a specific explanation of the above units, please refer to the method embodiments of fig. 3 to 10, and this section will not be described in detail.

In the embodiment of the invention, the trigger frame sent by the access point of the BSS associated with the station can be received, the current values of at least two NAVs arranged on the sub-channel frequency band of the channel transmission bandwidth of the BSS are inquired, the available sub-channel frequency band for data transmission is selected from the channel transmission bandwidth of the BSS through the current values of the at least two NAVs so as to respond to the trigger frame, the data transmission of the channel transmission bandwidth is controlled through the at least two NAVs, the transmission interference caused to the OBSS due to the adoption of one NAV can be reduced, the data transmission on the sub-channel frequency band of the channel transmission bandwidth is respectively controlled through the at least two NAVs, and the utilization rate of the frequency band is improved.

The data transmission protection method disclosed by the embodiment of the invention is that one NAV and one BSS color value are set on all sub-channel frequency bands of the channel transmission bandwidth.

In a specific embodiment, the station sets a NAV and a BSS color corresponding to the cell source to which the NAV belongs on the channel transmission bandwidth. The NAV is used for recording the time length that the station is forbidden to transmit data on all sub-channel frequency bands of the channel transmission bandwidth, and the BSS color is used for recording the source of the BSS to which the PPDU setting the NAV belongs. Ext> theext> BSSext> colorext> mayext> beext> derivedext> fromext> aext> BSSext> colorext> carriedext> byext> SIGext> -ext> aext> inext> theext> PPDUext>,ext> orext> fromext> aext> taext> valueext> carriedext> byext> aext> macext> headerext> ofext> theext> PPDUext>.ext>

When the station receives the PPDU, judging that the PPDU source comprises the following modes.

Mode 1: ext> andext> accordingext> toext> whetherext> theext> BSSext> colorext> valueext> inext> theext> SIGext> -ext> Aext> fieldext> inext> theext> PPDUext> isext> equalext> toext> theext> BSSext> colorext> valueext> ofext> theext> BSSext>.ext> And if the two values are equal, the PPDU is transmitted by the BSS. If the values of the two are not equal, the PPDU is not transmitted by the present BSS.

Mode 2: and according to whether the TA value carried by the MAC header of the PPDU is equal to the MAC address of the AP associated with the station. And if the two values are equal, the PPDU is transmitted by the BSS. If the values of the two are not equal, the PPDU is not transmitted by the present BSS.

Ext> theext> stationext> determinesext> theext> granularityext> ofext> theext> TXOPext> inext> theext> SIGext> -ext> Aext> fieldext> inext> theext> PPDUext> inext> additionext> toext> theext> sourceext> ofext> theext> PPDUext>.ext> Where the particle size of a TXOP is used to represent the minimum resolvable interval of the TXOP, e.g., to represent a length of the TXOP of 7 bits (B0-B6), where B0 represents the particle size unit, 0 represents the particle size of 8us, 1 represents the particle size of 128us, B1-B6 represents the actual TXOP size, then the particle size of 8us may represent a TXOP range of (8 us of (B1-B6)), i.e., 0-504 us, and 128us may represent a TXOP range of (512+128 of (B1-B6)), i.e., 512-8576 us).

Ext>ext> ifext>ext> theext>ext> PPDUext>ext> isext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> PPDUext>ext> ofext>ext> theext>ext> currentext>ext> NAVext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> andext>ext> whenext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> TXOPext>ext> domainext>ext> representingext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> inext>ext> theext>ext> PPDUext>ext> isext>ext> changedext>ext> fromext>ext> bigext>ext> toext>ext> smallext>ext>,ext>ext> updatingext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> NAVext>ext> intoext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext> optionallyext>,ext> ifext> theext> PPDUext> isext> derivedext> fromext> theext> BSSext>,ext> andext> theext> PPDUext> forext> settingext> orext> updatingext> theext> currentext> NAVext> isext> derivedext> fromext> theext> BSSext>,ext> updatingext> theext> currentext> valueext> ofext> theext> NAVext> toext> theext> txopext> valueext> ofext> theext> SIGext> -ext> aext> fieldext> ofext> theext> PPDUext>.ext>

Ext>ext> forext>ext> exampleext>ext>,ext>ext> theext>ext> PPDUext>ext> isext>ext> derivedext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> theext>ext> PPDUext>ext> forext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> currentext>ext> NAVext>ext> isext>ext> derivedext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> currentlyext>ext> setext>ext> orext>ext> updatedext>ext> NAVext>ext> isext>ext> 128ext>ext> usext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext> isext>ext> 8ext>ext> usext>ext>,ext>ext> andext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> NAVext>ext> isext>ext> updatedext>ext> toext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext>ext> ifext>ext> theext>ext> PPDUext>ext> isext>ext> derivedext>ext> fromext>ext> theext>ext> OBSSext>ext>,ext>ext> theext>ext> PPDUext>ext> forext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> currentext>ext> NAVext>ext> isext>ext> derivedext>ext> fromext>ext> theext>ext> sameext>ext> OBSSext>ext>,ext>ext> andext>ext> whenext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> TXOPext>ext> domainext>ext> representingext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> inext>ext> theext>ext> PPDUext>ext> isext>ext> changedext>ext> fromext>ext> largeext>ext> toext>ext> smallext>ext>,ext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> NAVext>ext> isext>ext> updatedext>ext> toext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> inext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext> optionallyext>,ext> ifext> theext> PPDUext> isext> derivedext> fromext> anext> OBSSext>,ext> theext> PPDUext> forext> settingext> orext> updatingext> theext> currentext> NAVext> isext> derivedext> fromext> theext> sameext> OBSSext>,ext> andext> updatingext> theext> currentext> valueext> ofext> theext> NAVext> toext> theext> txopext> valueext> ofext> theext> SIGext> -ext> aext> fieldext> ofext> theext> PPDUext>.ext>

Ext>ext> forext>ext> exampleext>ext>,ext>ext> theext>ext> PPDUext>ext> isext>ext> derivedext>ext> fromext>ext> OBSSext>ext> 1ext>ext>,ext>ext> theext>ext> PPDUext>ext> forext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> currentext>ext> NAVext>ext> isext>ext> derivedext>ext> fromext>ext> theext>ext> presentext>ext> BSSext>ext> 1ext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> currentlyext>ext> setext>ext> orext>ext> updatedext>ext> NAVext>ext> isext>ext> 128ext>ext> usext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext> isext>ext> 8ext>ext> usext>ext>,ext>ext> andext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> NAVext>ext> isext>ext> updatedext>ext> toext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext>ext> ifext>ext> theext>ext> sourceext>ext> ofext>ext> theext>ext> PPDUext>ext> isext>ext> differentext>ext> fromext>ext> theext>ext> sourceext>ext> ofext>ext> theext>ext> PPDUext>ext> forext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> currentext>ext> NAVext>ext>,ext>ext> whenext>ext> theext>ext> TXOPext>ext> domainext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> inext>ext> theext>ext> PPDUext>ext> representsext>ext> thatext>ext> theext>ext> TXOPext>ext> valueext>ext> isext>ext> largerext>ext> thanext>ext> theext>ext> valueext>ext> ofext>ext> theext>ext> currentext>ext> NAVext>ext>,ext>ext> updatingext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> NAVext>ext> toext>ext> theext>ext> TXOPext>ext> valueext>ext> ofext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>,ext>ext> andext>ext> updatingext>ext> theext>ext> BSSext>ext> colorext>ext> toext>ext> theext>ext> BSSext>ext> colorext>ext> valueext>ext> ofext>ext> theext>ext> PPDUext>ext> sourceext>ext>.ext>ext> Ext> andext> whenext> theext> TXOPext> fieldext> inext> theext> SIGext> -ext> Aext> fieldext> inext> theext> PPDUext> representsext> thatext> theext> TXOPext> valueext> isext> smallerext> thanext> orext> equalext> toext> theext> valueext> ofext> theext> currentext> NAVext>,ext> notext> updatingext> theext> currentext> NAVext> andext> theext> BSSext> colorext>.ext>

Ext> inext> theext> embodimentext> ofext> theext> inventionext>,ext> whetherext> theext> receivedext> PPDUext> isext> theext> sameext> asext> theext> PPDUext> whichext> setsext> orext> updatesext> theext> currentext> NAVext> orext> notext> canext> beext> judgedext>,ext> andext> whenext> theext> receivedext> PPDUext> isext> theext> sameext> asext> theext> PPDUext> whichext> setsext> orext> updatesext> theext> currentext> NAVext>,ext> theext> granularityext> ofext> TXOPext> inext> SIGext> -ext> Aext> ofext> theext> PPDUext> isext> reducedext> fromext> largeext> toext> smallext>;ext> Ext> optionallyext>,ext> ifext> itext> isext> determinedext> thatext> theext> receivedext> PPDUext> isext> theext> sameext> asext> theext> PPDUext> forext> settingext> orext> updatingext> theext> currentext> NAVext>,ext> updatingext> theext> currentext> NAVext> toext> theext> txopext> valueext> inext> theext> SIGext> -ext> aext> fieldext> ofext> theext> PPDUext>,ext> toext> flexiblyext> controlext> theext> durationext> ofext> theext> NAVext>,ext> reduceext> theext> overext> -ext> protectionext> ofext> theext> channelext>,ext> soext> thatext> theext> stationext> withext> theext> NAVext> canext> accessext> theext> channelext> earlierext>,ext> andext> improveext> theext> efficiencyext> ofext> channelext> useext>.ext>

The data transmission protection method disclosed by the embodiment of the invention is that an intra-NAV and an inter-NAV are arranged on all sub-channel frequency bands of the channel transmission bandwidth.

In a specific embodiment, the station sets an intra-NAV and an inter-NAV on the channel transmission bandwidth. The inter-NAV is used for recording the time length of the station which is forbidden to transmit data on all sub-channel frequency bands of the channel transmission bandwidth by the BSS, and the inter-NAV is used for recording the time length of the OBSS which is monitored by the station which is forbidden to transmit data on all sub-channel frequency bands of the channel transmission bandwidth.

Ext>ext> ifext>ext> theext>ext> PPDUext>ext> isext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> PPDUext>ext> ofext>ext> theext>ext> currentext>ext> NAVext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> andext>ext> whenext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> TXOPext>ext> domainext>ext> representingext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> inext>ext> theext>ext> PPDUext>ext> isext>ext> changedext>ext> fromext>ext> bigext>ext> toext>ext> smallext>ext>,ext>ext> updatingext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> intraext>ext> -ext>ext> NAVext>ext> intoext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext> optionallyext>,ext> ifext> theext> PPDUext> isext> fromext> theext> BSSext>,ext> andext> theext> PPDUext> forext> settingext> orext> updatingext> theext> currentext> NAVext> isext> fromext> theext> BSSext>,ext> updatingext> theext> currentext> valueext> ofext> theext> intraext> -ext> NAVext> toext> theext> txopext> valueext> inext> theext> SIGext> -ext> aext> fieldext> ofext> theext> PPDUext>.ext>

Ext>ext> forext>ext> exampleext>ext>,ext>ext> theext>ext> PPDUext>ext> isext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> theext>ext> PPDUext>ext> forext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> currentext>ext> NAVext>ext> isext>ext> fromext>ext> theext>ext> BSSext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> currentlyext>ext> setext>ext> orext>ext> updatedext>ext> NAVext>ext> isext>ext> 128ext>ext> usext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext> isext>ext> 8ext>ext> usext>ext>,ext>ext> andext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> intraext>ext> -ext>ext> NAVext>ext> isext>ext> updatedext>ext> toext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext>ext> ifext>ext> theext>ext> PPDUext>ext> isext>ext> derivedext>ext> fromext>ext> anext>ext> OBSSext>ext>,ext>ext> theext>ext> PPDUext>ext> forext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> currentext>ext> NAVext>ext> isext>ext> derivedext>ext> fromext>ext> theext>ext> sameext>ext> OBSSext>ext>,ext>ext> andext>ext> whenext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> TXOPext>ext> domainext>ext> representingext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> inext>ext> theext>ext> PPDUext>ext> isext>ext> changedext>ext> fromext>ext> largeext>ext> toext>ext> smallext>ext>,ext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> interext>ext> -ext>ext> NAVext>ext> isext>ext> updatedext>ext> toext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext> optionallyext>,ext> ifext> theext> PPDUext> isext> fromext> anext> OBSSext> andext> theext> PPDUext> forext> settingext> orext> updatingext> theext> currentext> NAVext> isext> fromext> theext> sameext> OBSSext>,ext> updatingext> theext> currentext> valueext> ofext> theext> interext> -ext> NAVext> toext> theext> txopext> valueext> inext> theext> SIGext> -ext> aext> fieldext> ofext> theext> PPDUext>.ext>

Ext>ext> forext>ext> exampleext>ext>,ext>ext> theext>ext> PPDUext>ext> isext>ext> fromext>ext> OBSSext>ext> 1ext>ext>,ext>ext> theext>ext> PPDUext>ext> forext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> currentext>ext> NAVext>ext> isext>ext> fromext>ext> OBSSext>ext> 1ext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> currentlyext>ext> setext>ext> orext>ext> updatedext>ext> NAVext>ext> isext>ext> 128ext>ext> usext>ext>,ext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext> isext>ext> 8ext>ext> usext>ext>,ext>ext> andext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> interext>ext> -ext>ext> NAVext>ext> isext>ext> updatedext>ext> toext>ext> theext>ext> txopext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext>

Ext>ext> ifext>ext> theext>ext> PPDUext>ext> isext>ext> fromext>ext> anext>ext> OBSSext>ext>,ext>ext> settingext>ext> orext>ext> updatingext>ext> theext>ext> PPDUext>ext> ofext>ext> theext>ext> currentext>ext> NAVext>ext> fromext>ext> otherext>ext> OBSSsext>ext>,ext>ext> andext>ext> whenext>ext> theext>ext> TXOPext>ext> domainext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> inext>ext> theext>ext> PPDUext>ext> representsext>ext> thatext>ext> theext>ext> TXOPext>ext> valueext>ext> isext>ext> largerext>ext> thanext>ext> theext>ext> valueext>ext> ofext>ext> theext>ext> currentext>ext> NAVext>ext>,ext>ext> updatingext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> NAVext>ext> toext>ext> theext>ext> TXOPext>ext> valueext>ext> ofext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> fieldext>ext> ofext>ext> theext>ext> PPDUext>ext>,ext>ext> andext>ext> updatingext>ext> theext>ext> BSSext>ext> colorext>ext> toext>ext> theext>ext> BSSext>ext> colorext>ext> valueext>ext> ofext>ext> theext>ext> PPDUext>ext>.ext>ext> Ext> andext> whenext> theext> TXOPext> fieldext> inext> theext> SIGext> -ext> Aext> fieldext> inext> theext> PPDUext> representsext> thatext> theext> TXOPext> valueext> isext> smallerext> thanext> orext> equalext> toext> theext> valueext> ofext> theext> currentext> NAVext>,ext> notext> updatingext> theext> currentext> NAVext> andext> theext> BSSext> colorext>.ext>

Ext>ext> inext>ext> theext>ext> embodimentext>ext> ofext>ext> theext>ext> inventionext>ext>,ext>ext> theext>ext> occupiedext>ext> timeext>ext> ofext>ext> theext>ext> PPDUext>ext> fromext>ext> theext>ext> BSSext>ext> andext>ext> theext>ext> OBSSext>ext> isext>ext> distinguishedext>ext> byext>ext> settingext>ext> anext>ext> interext>ext> -ext>ext> NAVext>ext> andext>ext> anext>ext> intraext>ext> -ext>ext> NAVext>ext>,ext>ext> whenext>ext> theext>ext> granularityext>ext> ofext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> ofext>ext> theext>ext> PPDUext>ext> fromext>ext> theext>ext> BSSext>ext> orext>ext> theext>ext> OBSSext>ext> isext>ext> reducedext>ext>,ext>ext> theext>ext> currentext>ext> valueext>ext> ofext>ext> theext>ext> intraext>ext> -ext>ext> NAVext>ext> orext>ext> theext>ext> interext>ext> -ext>ext> NAVext>ext> isext>ext> updatedext>ext> toext>ext> beext>ext> theext>ext> TXOPext>ext> valueext>ext> inext>ext> theext>ext> SIGext>ext> -ext>ext> Aext>ext> ofext>ext> theext>ext> PPDUext>ext> soext>ext> asext>ext> toext>ext> flexiblyext>ext> controlext>ext> theext>ext> occupiedext>ext> timeext>ext> ofext>ext> theext>ext> stationext>ext> toext>ext> theext>ext> channelext>ext>,ext>ext> reduceext>ext> theext>ext> overext>ext> -ext>ext> protectionext>ext> ofext>ext> theext>ext> channelext>ext>,ext>ext> enableext>ext> theext>ext> stationext>ext> withext>ext> theext>ext> NAVext>ext> toext>ext> beext>ext> accessedext>ext> toext>ext> theext>ext> channelext>ext> earlierext>ext> andext>ext> improveext>ext> theext>ext> useext>ext> efficiencyext>ext> ofext>ext> theext>ext> channelext>ext>.ext>ext>

The data transmission protection method disclosed by the embodiment of the invention is to set one NAV on all sub-channel frequency bands of the channel transmission bandwidth.

Ext> whenext> theext> stationext> receivesext> theext> PPDUext>,ext> judgingext> theext> TXOPext> domainext> ofext> theext> SIGext> -ext> Aext> fieldext> inext> theext> PPDUext>,ext> andext> ifext> theext> TXOPext> domainext> isext> aext> specificext> valueext>,ext> updatingext> theext> currentext> valueext> ofext> theext> NAVext> toext> aext> presetext> valueext>.ext>

Ext> inext> aext> specificext> implementationext>,ext> ifext> theext> SIGext> -ext> aext> fieldext> txopext> inext> theext> PPDUext> isext> determinedext> toext> beext> allext> zerosext>,ext> theext> currentext> valueext> ofext> theext> navext> mayext> beext> updatedext> toext> 0ext> toext> clearext> theext> currentext> valueext> ofext> theext> navext>.ext>

In the embodiment of the invention, the TXOP domain is set as a specific value to play a role of resetting the NAV, so that the time length occupied by the channel is flexibly controlled, and the channel use right is timely released when the station does not need to occupy the channel, so that other stations with NAV can access the channel earlier, and the channel use efficiency is improved.

In a specific embodiment, the station sets a NAV and a BSS color corresponding to the cell source to which the NAV belongs on the channel transmission bandwidth. The NAV is used for recording the time length that the station is forbidden to transmit data on all sub-channel frequency bands of the channel transmission bandwidth, and the BSS color is used for recording the source of the BSS to which the PPDU setting the NAV belongs.

Mode 2: and according to whether the TA value carried by the MAC header of the PPDU is equal to the MAC address of the AP associated with the station. And if the two values are equal, the PPDU is transmitted by the BSS. If the values of the two are not equal, the PPDU is not transmitted by the present BSS. Ext> theext> stationext> determinesext> whetherext> theext> txopext> inext> theext> SIGext> -ext> aext> fieldext> inext> theext> PPDUext> isext> aext> specificext> valueext> inext> additionext> toext> determiningext> theext> sourceext> ofext> theext> PPDUext>.ext>

And if the BSS from which the PPDU is derived is consistent with the BSS color record source, updating the current NAV to a preset value.

If the BSS from which the PPDU is derived is inconsistent with the BSS color record source, the current NAV is not updated to be a preset value.

Ext> inext> aext> specificext> implementationext>,ext> ifext> theext> SIGext> -ext> aext> fieldext> txopext> fieldext> inext> theext> PPDUext> isext> determinedext> toext> beext> allext> zerosext>,ext> theext> currentext> valueext> ofext> theext> navext> mayext> beext> updatedext> toext> 0ext> toext> clearext> theext> currentext> valueext> ofext> theext> navext>.ext>

In the embodiment of the invention, the TXOP domain is set as a specific value to play a role of resetting the NAV, so that the time length occupied by the channel is flexibly controlled, and the channel use right is timely released when the station does not need to occupy the channel, so that other stations with NAV set by the PPDU of the same source can access the channel earlier, and the channel use efficiency is improved.

Ext> theext> stationext> determinesext> whetherext> theext> txopext> inext> theext> SIGext> -ext> aext> fieldext> inext> theext> PPDUext> isext> aext> specificext> valueext> inext> additionext> toext> determiningext> theext> sourceext> ofext> theext> PPDUext>.ext> Ext> ifext> theext> PPDUext> isext> derivedext> fromext> theext> BSSext>,ext> whenext> theext> txopext> inext> theext> SIGext> -ext> aext> fieldext> inext> theext> PPDUext> isext> aext> specificext> valueext>,ext> theext> intraext> -ext> navext> isext> updatedext> toext> aext> presetext> valueext>.ext> Ext> ifext> theext> PPDUext> isext> derivedext> fromext> anext> OBSSext> andext> theext> txopext> inext> theext> SIGext> -ext> aext> fieldext> inext> theext> PPDUext> isext> aext> specificext> valueext>,ext> theext> interext> -ext> navext> isext> updatedext> toext> aext> presetext> valueext>.ext>

Ext> inext> aext> specificext> implementationext>,ext> ifext> theext> PPDUext> isext> derivedext> fromext> theext> BSSext> andext> theext> txopext> fieldext> ofext> theext> SIGext> -ext> aext> fieldext> inext> theext> PPDUext> isext> judgedext> toext> beext> allext> zeroext>,ext> theext> currentext> valueext> ofext> theext> intraext> -ext> navext> mayext> beext> updatedext> toext> 0ext> toext> clearext> theext> currentext> valueext> ofext> theext> intraext> -ext> navext>;ext> Ext> ifext> theext> PPDUext> isext> derivedext> fromext> anext> OBSSext> andext> theext> SIGext> -ext> aext> fieldext> txopext> fieldext> inext> theext> PPDUext> isext> determinedext> toext> beext> allext> zeroext>,ext> theext> currentext> valueext> ofext> theext> erext> -ext> navext> mayext> beext> updatedext> toext> 0ext> toext> clearext> theext> currentext> valueext> ofext> theext> interext> -ext> navext>

In the embodiment of the invention, the TXOP domain is set to be a specific value to play a role in resetting the NAV, so that the time length occupied by the channel is flexibly controlled, and the channel use right is timely released when the station does not need to occupy the channel, so that the station with the NAV set by the PPDU of the BSS or OBSS can access the channel earlier, and the channel use efficiency is improved.

The data transmission protection device according to the embodiment of the present invention is further described below. Referring to fig. 12, fig. 12 is a schematic structural diagram of a data transmission protection device according to an embodiment of the invention. As shown in fig. 12, the data transmission protection apparatus may include: at least one processor 1001, such as a CPU, at least one wireless communication module 1002, memory 1003, at least one communication bus 1004. Communication bus 1004 is used to enable connected communication between these components. The wireless communication module 1002 may provide a wireless network access function for the data transmission protection device, and may communicate with the access point device through Wifi, bluetooth, or the like. Memory 1003 may include high-speed RAM memory or may also include non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 1003 may optionally include at least one storage device located remotely from the processor 1001.

In some implementations, the memory 1003 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

an operating system 10031 containing various system programs for implementing various basic services and handling hardware-based tasks;

the application programs 10032 include various application programs such as a device control service program and a device identification service program, and are used for realizing various application services.

Specifically, the processor 1001 is configured to call a program stored in the memory 1003, and execute the following operations:

when a trigger frame sent by an access point of a Basic Service Set (BSS) associated with a station is received, selecting an available sub-channel frequency band for data transmission from the channel transmission bandwidth of the BSS according to the current values of at least two Network Allocation Vectors (NAVs) set on the sub-channel frequency band of the channel transmission bandwidth of the BSS, and responding to the trigger frame.

In an embodiment of the present invention, when receiving a trigger frame sent by an access point of a basic service set BSS associated with a station, before selecting an available sub-channel band for data transmission from the channel transmission bandwidth of the BSS according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS, the following steps are further performed:

In an embodiment of the invention, when receiving a trigger frame sent by an access point of a basic service set BSS associated with a station, before responding to the trigger frame from available sub-channel bands for data transmission in a channel transmission bandwidth of the BSS according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS, the following steps are further performed:

In one embodiment, when receiving a trigger frame sent by an access point of a basic service set BSS associated with a station, before selecting an available sub-channel band for data transmission from the channel transmission bandwidth of the BSS according to current values of at least two network allocation vectors NAVs set on sub-channel bands of the channel transmission bandwidth of the BSS, the following steps are further performed:

In one embodiment, the selecting an available sub-channel band for data transmission from the channel transmission bandwidths of the BSS according to the current values of at least two network allocation vectors NAVs set on the sub-channel bands of the channel transmission bandwidths of the BSS specifically performs the following steps in response to the trigger frame:

when an inter-NAV is set on all sub-channel frequency bands of the channel transmission bandwidth, if the current value of the inter-NAV is equal to a preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission to respond to the trigger frame;

when at least one inter-NAV corresponding to each monitored OBSS is set on all sub-channel frequency bands of the channel transmission bandwidth, if the current value of the inter-NAV is equal to a preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission to respond to the trigger frame.

when each sub-channel frequency band of the channel transmission bandwidth is respectively provided with an inter-NAV, selecting at least one sub-channel frequency band with the current value equal to a preset value of the inter-NAV as an available sub-channel frequency band for data transmission to respond to the trigger frame; or (b)

In one embodiment, according to the current values of at least two network allocation vectors NAVs set on sub-channel frequency bands of the channel transmission bandwidth of the BSS, selecting an available sub-channel frequency band for data transmission from the channel transmission bandwidth of the BSS in response to the trigger frame, specifically performing the following steps:

Selecting at least one sub-channel band of which the current value of the NAV is equal to the preset value as an available sub-channel band for data transmission in response to the trigger frame; or (b)

In one embodiment, the following steps are also performed:

after the available sub-channel frequency band is selected, confirming the frequency domain resource of the transmission of the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame, so as to transmit the data frame on the confirmed frequency domain resource.

In one embodiment, after the PPDU source is determined, the following steps are further performed:

if the PPDU is derived from a basic service set BSS associated with a station and the station is not a sending target of the PPDU, acquiring a duration value duration in the PPDU;

In one embodiment, after the determining the source of the PPDU, the following steps are further performed:

if the PPDU is derived from an Overlapped Basic Service Set (OBSS), acquiring a duration value duration in the PPDU;

In one embodiment, after the PPDU is received, the following steps are further performed:

In one embodiment, after the PPDU source is determined and the PPDU type is determined when the PPDU is received, the following steps are further performed:

In one embodiment, the following steps are also performed:

In the embodiment of the invention, the available sub-channel frequency band for data transmission can be selected by receiving the trigger frame sent by the access point of the BSS associated with the station and inquiring the current values of at least two NAVs arranged on the sub-channel frequency band of the channel transmission bandwidth of the BSS so as to respond to the trigger frame, thereby reducing the data transmission interference to the OBSS, simultaneously respectively arranging NAVs aiming at different transmission bandwidths, avoiding the waste of frequency band resources and improving the frequency band utilization rate.

The functions of the intra-NAV in the above embodiments of the present invention may also be performed by a NAV in the prior art, that is, one NAV is set on all sub-channel bands of the channel transmission bandwidth, and the data transmission protection is implemented by combining the NAV in the prior art with the inter-NAV involved in the above embodiments of the present invention by using the steps or the execution units related to the above embodiments of the present invention. Furthermore, the scheme of realizing data transmission protection by adopting the relevant steps or the execution units and the like of the embodiment of the invention, wherein only the inter-NAV is set and the intra-NAV is not set, is also within the scope of protection of the patent.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.

The foregoing disclosure is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the claims herein, as equivalent changes to the claims herein will fall within the scope of the invention.

Claims

1. A method of data transmission protection, comprising:

setting an intra-NAV and at least one inter-NAV corresponding to each monitored Overlapped Basic Service Set (OBSS) on all sub-channel frequency bands of the channel transmission bandwidth of the BSS;

wherein the intra-NAV is used for recording the time length of the station which is forbidden by the BSS to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the inter-NAV is used for recording the time length of the OBSS which is monitored by the station which is forbidden to perform data transmission on all sub-channel frequency bands of the channel transmission bandwidth;

Selecting an available sub-channel band for data transmission from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vector NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS, including: when the scheduling target of the trigger frame includes the station, if the current value of the inter-NAV set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is equal to a preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission.

2. The method according to claim 1, wherein the method further comprises: after the available sub-channel frequency band is selected, confirming the frequency domain resource of the transmission of the station from the available sub-channel frequency band according to the frequency domain resource scheduling information of the trigger frame, so as to transmit the data frame on the confirmed frequency domain resource.

3. The method according to claim 1 or 2, wherein when receiving a trigger frame sent by an access point of a basic service set BSS associated with a station, selecting an available sub-channel band for data transmission from the channel transmission bandwidth of the BSS according to current values of at least two network allocation vectors NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS, further comprises, before responding to the trigger frame:

4. The method of claim 3, wherein after said determining the PPDU source, further comprising:

acquiring a duration value duration in the PPDU;

if the PPDU is derived from a basic service set BSS associated with a station and the station is not a sending target of the PPDU, and the current value of the intra-NAV set on all sub-channel frequency bands of the channel transmission bandwidth is smaller than the duration, updating the current value of the intra-NAV into the duration; or (b)

5. A method according to claim 3, characterized in that the method further comprises:

acquiring a duration value duration in the PPDU;

and if the PPDU is derived from an Overlapped Basic Service Set (OBSS), and at least one inter-NAV corresponding to the OBSS monitored by the station is set in all sub-channel frequency bands, if the current value of the inter-NAV corresponding to the OBSS with the same source of the PPDU of the duration is smaller than the duration, updating the inter-NAV corresponding to the OBSS with the same source of the PPDU of the duration into the duration.

6. The method of claim 3, further comprising, after receiving the PPDU:

7. The method of claim 3, wherein after determining the PPDU source and determining the type of PPDU when the PPDU is received, further comprising:

8. A method according to claim 3, further comprising:

9. A method according to claim 3, further comprising:

10. A data transmission protection device, comprising:

a receiving unit, configured to receive a trigger frame sent by an access point of a basic service set BSS associated with a station;

A setting unit, configured to set an intra-NAV and at least one inter-NAV corresponding to each monitored overlapped basic service set OBSS on all sub-channel frequency bands of a channel transmission bandwidth of the BSS;

a response unit, configured to select an available sub-channel band for data transmission from the channel transmission bandwidths of the BSS according to current values of at least two network allocation vectors NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS, where the response unit is configured to respond to the trigger frame, where the response unit includes: when the scheduling target of the trigger frame includes the station, if the current value of the inter-NAV set on all sub-channel frequency bands of the channel transmission bandwidth of the BSS is equal to a preset value, selecting all sub-channel frequency bands of the channel transmission bandwidth as available sub-channel frequency bands for data transmission.

11. The apparatus as recited in claim 10, further comprising:

and the confirmation unit is used for confirming the frequency domain resources of the transmission of the station from the available sub-channel frequency bands according to the frequency domain resource scheduling information of the trigger frame after the available sub-channel frequency bands are selected so as to transmit the data frames on the confirmed frequency domain resources.

12. The apparatus according to claim 10 or 11, further comprising:

the first judging unit is used for judging the source of the PPDU and judging the type of the PPDU when the PPDU is received;

a second judging unit, configured to judge whether a scheduling target of a trigger frame includes a station if the PPDU is derived from an access point of a basic service set BSS associated with the station and is the trigger frame;

and the response unit is further configured to, if the scheduling target of the trigger frame includes the station, select an available sub-channel band from the channel transmission bandwidth of the BSS according to the current values of at least two network allocation vectors NAVs set on the sub-channel band of the channel transmission bandwidth of the BSS, and send a data frame to respond to the trigger frame.

13. The apparatus as recited in claim 12, further comprising:

An analysis unit for acquiring a duration value duration in the PPDU;

the first updating unit is provided with a first updating unit,

and acquiring a designated sub-channel frequency band in the PPDU when the PPDU is from a basic service set BSS associated with a station and the station is not a sending target of the PPDU, and updating the current value of the intra-NAV to the duration if the current value of the intra-NAV set on the designated sub-channel frequency band is smaller than the duration.

14. The apparatus as recited in claim 12, further comprising:

the analysis unit is used for acquiring a duration value duration in the PPDU;

and the first updating unit is used for updating the inter-NAV corresponding to the OBSS with the same source as the PPDU of the duration into the duration if the current value of the inter-NAV corresponding to the OBSS with the same source as the PPDU of the duration is smaller than the duration when at least one inter-NAV corresponding to the OBSS respectively monitored by the station is set in all sub-channel frequency bands.

15. The apparatus as recited in claim 12, further comprising:

and the first updating unit is used for acquiring a designated sub-channel frequency band and a duration value duration in the PPDU when the PPDU is derived from an Overlapped Basic Service Set (OBSS) or when the PPDU is derived from a Basic Service Set (BSS) associated with a station and the station is not a transmission target of the PPDU, and updating the current value of the NAV smaller than the duration in the designated sub-channel frequency band to the duration if the designated sub-channel frequency band with the current value of the NAV smaller than the duration exists in the designated sub-channel frequency band.

16. The apparatus of claim 12, wherein the second updating unit is configured to:

17. The apparatus of claim 12, wherein the second updating unit is configured to:

If the received CF-END frame is sourced from an Overlapping Basic Service Set (OBSS), the station sets the current value of the inter-NAV which is the same as the source of the CF-END frame on all sub-channel frequency bands to be updated to a preset value; or (b)

18. The apparatus of claim 12, wherein the second updating unit is configured to: