WO2018076487A1

WO2018076487A1 - Method and device for recognizing basic service set (bss) home of received frame

Info

Publication number: WO2018076487A1
Application number: PCT/CN2016/109846
Authority: WO
Inventors: 杜振国
Original assignee: 华为技术有限公司
Priority date: 2016-10-28
Filing date: 2016-12-14
Publication date: 2018-05-03
Also published as: CN109804606B; CN109804606A

Abstract

Provided in the present invention are a method and a device for recognizing the BSS home of a received frame. The method comprises: a station (STA) receiving a reference frame from an associated access point (AP), and measuring the received signal strength of the reference frame to obtain a reference RSSI, the STA receiving a target frame, and measuring the received signal strength of the target frame to obtain a first RSSI, the format of the target frame being HE MU PPDU format, HE SU PPDU format of DL or HE ER SU PPDU format of DL, the physical header of the target frame comprising Color; when the target frame satisfies a first condition, and when the absolute value of the difference between the first RSSI and the reference RSSI is smaller than a predefined value, the STA determining that the target frame is the present BSS frame, the first condition comprising: the Color in the physical header of the target frame matching the Color of the STA. In the case of a Color conflict, the present invention also enables the STA to determine the BSS home of some of the HE PPDU, thereby realizing the purpose of saving power, increasing transmission opportunities and improving system throughput.

Description

Method and device for identifying BSS attribution of basic service set of received frames

This application claims the priority of the Chinese Patent Application filed on October 28, 2016, the Chinese Patent Application No. CN201610963892.4, entitled "A Method and Apparatus for Identifying the BSS Assignment of Receiving Frames", the entire contents of which are hereby incorporated by reference. The citations are incorporated herein by reference.

Technical field

The present invention relates to the field of wireless communications, and in particular, to a method and a device for identifying a BSS belonging to a basic service set (English full name: Basic Service Set, BSS) of a received frame.

Background technique

The current 802.11 standard uses the network allocation vector (English name: Network Allocation Vector, English abbreviation: NAV) mechanism for transmission protection, that is, the device updates its own NAV timer according to the duration of the received frame, and the NAV timer retreats to Prior to 0, the device does not actively contend for the channel, thereby avoiding interference with ongoing transmissions. This method is also known as virtual carrier sensing.

However, this NAV mechanism has the problem of frame error release by the end of no competition (English name: Contention-Free-End, English abbreviation: CF-End), because the device will reset its own CF-End sent by any device. NAV, the NAV timer will be cleared. As shown in Figure 1, the site (English full name: Station, English abbreviation: STA) 1 and STA2 are associated with the access point (English full name: Access Point, English abbreviation: AP) 1, STA3 is associated with AP2, STA2 can receive from Frames of AP1 and AP2. If the NAV of STA2 is set according to the duration of the frame from AP1, when STA2 receives the CF-End from AP2, it resets the NAV and starts to contend for the channel and transmits to AP1, which occurs with the transmission of STA2 to AP1 at AP1. Conversely, if the NAV of STA2 is set according to the Duration of the frame from AP2, when STA2 receives the CF-End from AP1, it resets the NAV and starts to contend for the channel and sends it to AP1, which is the transmission from STA3 to AP2. A collision occurred at AP2. The root cause of the above conflict is that the NAV set according to the frame of one BSS is released by the CF-End from another BSS, and the purpose of transmission protection is not achieved. A BSS is a cell, a system consisting of an AP and its associated STAs.

Summary of the invention

The invention proposes a solution to the problem of color conflict between adjacent BSSs, so that In the case of Color conflict, the STA can also determine the BSS attribution of the partially efficient (High Efficiency, English abbreviation: HE) PPDU, thereby achieving the purpose of saving power, increasing transmission opportunities, and improving system throughput. The HE PPDU is the PPDU of 802.11ax.

In view of this, the first aspect of the embodiments of the present invention provides a method for identifying a BSS attribution of a received frame, and the method may include:

The STA receives the reference frame from the associated access point AP, and receives the target frame. The format of the target frame is HE MU PPDU format, downlink (English full name: Downlink, English abbreviation: DL) HE SU PPDU format or DL HE range extension (English full name: Extended Range, English abbreviation: ER) SU PPDU format, the physical header of the target frame includes Color;

The STA measures the received signal strength of the reference frame, obtains a reference received signal strength indicator (English full name: Receive Signal Strength Indicator, English abbreviation: RSSI), and measures the received signal strength of the target frame to obtain a first RSSI;

When the target frame satisfies the first condition, and the absolute value of the difference between the first RSSI and the reference RSSI is less than a predefined value, the STA determines that the target frame is a BSS frame, and the first condition includes: Color and the physical header of the target frame STA's Color matches.

It can be seen that the Color matching is no longer the only condition for determining the target frame as the BSS frame. The introduction of the RSSI-based decision method enables the STA to correctly determine the BSS attribution of a part of the HE PPDU format frame in the case of the Color conflict of the adjacent BSS. Then, the correct NAV is selected to be updated, the interference caused by the error release of the NAV is avoided, the chance of STA transmission is increased, and the probability of spatial multiplexing by the STA is increased, and the overall throughput of the system is improved.

In some possible implementation manners, when the target frame satisfies the first condition, and the absolute value of the difference between the first RSSI and the reference RSSI is greater than a predefined value, the STA determines that the target frame is an OBSS frame.

In this implementation manner, even if the color is matched, the target frame may be an OBSS frame. In this case, a regular-NAV should be set, which can bring more transmission opportunities to the STA; and at this time, spatial multiplexing transmission can be performed, thereby improving the entire system. Throughput.

In other possible implementation manners, the first condition further includes: before receiving the target frame, the STA receives a first indication from the associated AP, where the first indication indicates that the associated AP does not support spatial multiplexing.

The transmission of the target frame without the use of power control is a prerequisite for the solution of the present invention. The STA may determine that the target frame does not use the power control according to the first indication, so the method of the present invention may be used to attribute the BSS of the target frame into the target frame. Line judgment.

In some other possible implementations, the first condition further includes: a second indication is included in a physical header of the target frame, the second indication is used to indicate that the target frame is not a spatial multiplexing frame, and the target frame is allowed to perform spatial multiplexing or a target frame. Power control is not used.

The transmission of the target frame without the use of power control is a prerequisite for the solution of the present invention. The STA may determine that the target frame does not use the power control according to the second indication, so the method of the present invention may be used to determine the BSS attribution of the target frame.

In other possible implementation manners, when the format of the target frame is the HE MU PPDU format, the first condition further includes: the target frame schedules at least two users.

In this implementation manner, the frame of the HE MU PPDU format may be used for transmission of a single user (English name: Single User, English abbreviation: SU), and the solution of the present invention should not be used at this time. When the target frame schedules at least two users, the target frame of the HE MU PPDU format is necessarily used for multi-user (English full name: Multiple, English abbreviation: MU) transmission, and the target frame is necessarily sent by the AP, so the present invention can be used. The method determines the BSS attribution of the target frame.

In other possible implementation manners, the target frame schedules at least two users, including: the STA determines, according to HE-SIG-A and/or HE-SIG-B in the physical header of the target frame, whether the target frame is scheduled for at least two. Users.

In this implementation manner, specifically, the STA determines whether the target frame schedules at least two users according to HE-SIG-A and/or HE-SIG-B in the physical header of the target frame, thereby determining whether the solution of the present invention can be used. The BSS attribution of the target frame is determined.

In other possible implementation manners, the first condition further includes that the STA that is scheduled by the target frame does not include the STA.

In this implementation manner, when the user scheduled by the target frame includes the STA itself, the STA shall decode the remaining part of the target frame, and determine whether it is the BSS frame according to the decoding result. At this time, the inventive scheme should not be used to determine the BSS attribution of the target frame.

In other possible implementation manners, when the format of the target frame is the HE SU PPDU format of the downlink DL or the HE ER SU PPDU format of the DL, the first condition further includes: before receiving the target frame, the STA receives the association from the association. The third indication of the AP, the third indication indicates that there is no tunnel direct link establishment in the BSS (English name: Tunneled Direct-link Setup, English abbreviation: TDLS) or straight Connection establishment (English full name: Direct Link Setup, English abbreviation: DLS) transmission, or TDLS or DLS transmission is prohibited in this BSS.

In this implementation, in the case of TSLS or DLS transmission, the scheme of the present invention should not be used to determine the BSS assignment of the target frame of the HE SU PPDU format of the DL or the HE ER SU PPDU format of the DL, because the HE SU in the TSLS/DLS transmission The frame in the /ER SU PPDU format also sets the UL/DL indication to DL. This type of frame cannot be distinguished by the STA in a simple manner from the DL frame transmitted by the AP.

In other possible implementations, the reference frame is a beacon Beacon frame.

A second aspect of the embodiments of the present invention provides a method for identifying a BSS attribution of a received frame, where the method may include:

The STA receives the target frame, and the format of the target frame is an HE trigger-based PPDU. The physical header of the target frame includes a color. The STA detects the signal before receiving the target frame interval for a predefined time, and obtains the first detection result.

When the color in the physical header of the target frame matches the color of the STA, the STA determines the BSS attribution of the target frame according to the first rule. The first rule includes: if the first detection result includes a Trigger frame from the BSS, or the first If the detection result is that the signal is detected but the signal MAC part is not correctly solved, the STA determines that the target frame is the BSS frame; if the first detection result is that no signal is detected, or the first detection result is the correct decoding signal MAC part but The MAC part does not include the Trigger frame of the BSS, and the STA determines that the target frame is an OBSS frame.

It can be seen that the color matching is no longer the only condition for determining the target frame as the BSS frame. For the target frame of the HE trigger-based PPDU format, the BSS attribution is determined according to the reception condition of the previous Trigger frame, which can effectively solve the problem that the Color conflict will come from The HE trigger-based PPDU of OBSS is determined to be a problem of the BSS frame. When the target frame is determined to be an OBSS frame, the STA sets the regular-NAV, which can bring more transmission opportunities to the STA; and the STA can perform spatial multiplexing transmission at this time, thereby improving the throughput of the entire system.

In some possible implementations, the predefined time is a short interframe space SIFS.

A third aspect of the embodiments of the present invention provides a device for identifying a BSS belonging to a received frame, where the device is configured to implement the functions of the method provided by the foregoing first aspect or any optional implementation manner of the first aspect, implemented by software. The software includes a module corresponding to the above function, and the module corresponding to the above function may include a receiving module, a measuring module, and a determining module, and the receiving module is configured to implement corresponding receiving The function of the measurement module is used to implement the corresponding measurement function, and the determination module is used to implement the function of the corresponding determination.

A fourth aspect of the embodiments of the present invention provides a device for identifying a BSS attribution of a received frame, where the device is configured to implement the functions of the method provided by any of the foregoing second aspect or the optional implementation of the second aspect, implemented by software. The software includes a module corresponding to the above function, and the module corresponding to the above function may include a receiving module and a determining module, the receiving module is configured to implement a corresponding receiving function, and the determining module is configured to implement a corresponding determining function.

It can be seen from the above technical solution that the embodiment of the present invention has the following advantages: Color matching is no longer the only condition for determining that the target frame is a BSS frame, and the introduction of the RSSI-based determination method makes the Color conflict of adjacent BSSs The STA can also correctly determine the BSS attribution of a part of the HE PPDU format frame, and then select the correct NAV to update it, avoiding the interference caused by the error release of the NAV, increasing the chance of STA transmission, and also increasing the STA for spatial multiplexing. The probability of increasing the overall throughput of the system.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Other figures can also be obtained from those of ordinary skill in the art in view of these figures.

1 is a schematic diagram of a scenario in which a NAV is erroneously released in the prior art;

2 is a schematic structural diagram of an 802.11ax PPDU in the prior art;

FIG. 3 is a schematic flowchart of a method for identifying a BSS attribution of a received frame according to an embodiment of the present invention;

4 is a schematic flowchart of another method for identifying a BSS attribution of a received frame according to an embodiment of the present invention;

5 is a schematic diagram of using a HE trigger-based PPDU in the prior art;

6 is a schematic flowchart of a method for identifying a BSS attribution of a received frame according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an apparatus for identifying a BSS belonging to a received frame according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another apparatus for identifying a BSS belonging to a received frame according to an embodiment of the present invention.

detailed description

The technical solution in the embodiment of the present invention will be clarified in the following with reference to the accompanying drawings in the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained based on the embodiments of the present invention are within the scope of the present invention.

The terms "first", "second", "third", "fourth", etc. (if present) in the specification and claims of the present invention and the above figures are used to distinguish similar objects without having to use To describe a specific order or order. It is to be understood that the data so used may be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than what is illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

The term "and/or" in this document is merely an association describing the associated object. The identifier may have three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

For the Color conflict problem between adjacent BSSs, 802.11ax proposes a dual NAV mechanism, that is, the NAV maintained by each device includes two internal intra-NAVs and a regular regular-NAV. When the device receives a frame from the BSS (non-CF-End), it sets the intra-NAV based on the Duration carried in it, but does not affect the regular-NAV; when the device receives a basic service set from the overlap (English full name: Overlapping, the abbreviation of OBSS (non-CF-End) or when the frame to which the BSS belongs cannot be determined, the regular-NAV is set based on the Duration carried therein, but the intra-NAV is not affected. Accordingly, when the device receives a CF-End from the BSS, only the intra-NAV is released; when the device receives a CF-End from the OBSS, only the regular-NAV is released. In this way, the problem that the NAV set according to the frame from one BSS is released by the CF-End error from another BSS is avoided, thereby avoiding collision. Generally, determining whether a frame is a BSS frame is determined according to a basic service set identifier (Basic Service Set Identifier, BSSID) included in the MAC portion of the frame, and if the value matches the BSSID saved by itself. , is considered to be this BSS frame. The BSSID is usually 48 bits, which is generally the same as the address of the AP, but it can be different.

802.11ax has designed four physical layer convergence process protocol data units (English full name: Physical Layer Convergence Procedure Protocol Data Unit, English abbreviation: PPDU) structure, including the color in the HE-SIG-A of the physical heads of these four PPDUs. Color and transmission opportunity (English full name: Transmission Opportunity, English abbreviation: TXOP) Duration, as shown in Figure 2, Color is the BSS Color in the figure. The color is 6 bits long and is the short identifier of the BSS, which is equivalent to a simplified representation of the BSSID. In different PPDU formats, the positions of Color are slightly different. For example, the Color in the HE SU/ER PPDU is located in the B8-B13 bit, and the Color in the HE MU PPDU is located in the B5-B10 bit. The color of a BSS is usually determined by the AP when it initializes the network, but can be modified at any time. TXOP Duration is the aforementioned Duration, but it was previously placed in the MAC header (in Data in Figure 2), while 802.11ax is also carried in the physical header. Carrying Color and TXOP Duration through the physical head enables any device to determine the BSS attribution of the frame according to the physical header, and set the NAV according to the TXOP Duration without having to solve the MAC part, thereby saving power. On the other hand, carrying the Color in the physical header also causes the device to spatially multiplex with the rest of the frame when determining that the current frame is not the BSS frame according to Color (802.11ax specifies that the OBSS frame can only be spatially multiplexed, and Cannot be spatially multiplexed with this BSS frame), thereby improving transmission efficiency and system throughput.

In the four HE PPDU formats shown in Figure 2, Color is 6 bits long, which supports 64 different values. One of the main scenarios targeted by 802.11ax is device-distributed scenarios. In this case, Color appears in the adjacent BSS. The probability of taking values is extremely high, which leads to Color conflicts. When there are more than 63 BSSs around a BSS, Color conflicts must exist and cannot be avoided. If the Colors of two neighboring BSSs collide, the STA cannot distinguish the BSS of the frame by the Color in the physical header, and always considers the frame as the BSS frame, thus always setting the intra-NAV. If the STA sets the intra-NAV according to the frame of the OBSS from the Color conflict, when the OBSS setting sends the CF-End, the intra-NAV of the STA cannot be released, which obviously reduces the STA transmission opportunity for the STA located at the edge of the BSS. Particularly disadvantageous; if the STA sets the intra-NAV according to the frame of the OBSS from the Color collision, but is released by the CF-End from the BSS, the STA contends for the channel and transmits data, which may cause interference to the ongoing transmission in the OBSS. At the same time, the STA must process the part of the Color collision frame after the physical header (because this frame is regarded as the BSS frame), which cannot save power; again, the frame from the OBSS cannot be performed due to the Color conflict. Spatial multiplexing reduces transmission efficiency and system throughput.

For the above problem, referring to FIG. 3, an embodiment of the present invention provides a method for identifying a BSS attribution of a received frame, including:

101. The STA receives the reference frame from the associated AP, and measures the received signal strength of the reference frame to obtain a reference RSSI.

102. The STA receives the target frame, and measures the received signal strength of the target frame to obtain a first RSSI. The format of the target frame is a HE MU PPDU format, a HE SU PPDU format of the DL, or a HE ER SU PPDU format of the DL, and the target frame. The physical header includes Color;

103. When the target frame satisfies the first condition, and the absolute value of the difference between the first RSSI and the reference RSSI is less than a predefined value, the STA determines that the target frame is a BSS frame, and the first condition includes: in a physical header of the target frame. Color matches the color of the STA.

In this embodiment, further, when the target frame satisfies the first condition, and the absolute value of the values of the first RSSI and the reference RSSI is greater than a predefined value, the STA determines that the target frame is an OBSS frame.

The premise of the invention is that the transmission of the AP does not use power control, ie always uses full power or constant power transmission.

In general, the target frame of the HE MU PPDU format must be sent by the AP for DL MU transmission, such as DL MU-MIMO or DL OFDMA. The reference frame from the AP may be a Beacon frame periodically sent by the AP. The period of the Beacon is usually several hundred milliseconds, for example, 100 ms. For a WiFi device mainly composed of static and low-speed motion scenes, the state of the channel between the STA and the AP does not substantially change in such a short time. Therefore, the channel when the STA receives the target frame is basically the same as the channel state when the latest Beacon is received. When the AP transmit power remains unchanged, the RSSI of the STA receiving the Beacon and the target frame should also be substantially equivalent. The reference RSSI is denoted as RSSI ₀ , and the first RSSI is denoted as RSSI ₁ , then when |RSSI ₁ -RSSI ₀ |<Δ, the target frame is determined to be the BSS frame, and when |RSSI ₁ -RSSI ₀ |>Δ, the target is determined The frame is an OBSS frame. Where Δ is a predefined value, which may be predefined in the standard; Δ may also be determined by the AP, and the STA is notified, for example, in a Beacon frame or a probe response Probe Response frame or an association response Association Response frame or other management frame. STA. Relatively speaking, the latter is more flexible: when the AP measures that the channel is relatively stable, Δ can be smaller; when the AP measures that the channel is not stable, the Δ should be adjusted larger. Note that the above expression can also be "|RSSI ₁ -RSSI ₀ | ≤ Δ" or "|RSSI ₁ -RSSI ₀ | ≥ Δ", that is, the critical case of "=" can also be considered as this BSS frame or OBSS frame. .

Similarly, the target frame of the DL HE SU/ER SU PPDU format is generally sent by the AP. When the AP transmit power remains unchanged, the RSSI of the STA receiving the Beacon and the target frame should also be roughly equivalent, so the STA can adopt The above method determines the BSS attribution of the target frame. Whether the target frame of the HE SU/ER SU PPDU format received by the STA is a DL frame may be determined according to the UL/DL indication of the HE-SIG-A in the physical header of the target frame. If the DL is indicated, the target frame is a DL frame. . On the other hand, since the HE SU/ER SU PPDU is used for TDLS/DLS transmission (ie, P2P transmission between two STAs associated with an AP), the UL/DL in its HE-SIG-A is also set to DL, Therefore, when there is a TDLS/DLS transmission in the BSS, it is obvious that the BSS assignment of the received HE SU/ER SU PPDU is determined by the above method, because the above method is only applicable to the scenario where there is no TDLS/DLS transmission. Therefore, the first condition should further include: before receiving the target frame in the HE SU/ER SU PPDU format, the STA receives a third indication from the associated AP, wherein the BSS is instructed to have no TDLS/DLS transmission, or the BSS prohibits the TDLS /DLS transmission. The third indication may be carried by a management frame sent by the AP.

In addition to the Beacon frame, the reference frame can also be any frame that can determine the transmission from the BSS AP and use full power. For example, the STA receives an RTS and determines that the frame is from the BSS AP according to its TA field, so the RSSI of the RTS can be used as the reference RSSI.

The so-called "Color in the HE-SIG-A of the target frame matches the color of the STA" means that the Color value carried in the HE-SIG-A of the target frame physical header is the same as the STA's own Color value. The Color of the STA is determined by its associated AP and is the short identifier of the BSS.

It should be noted that the reference RSSI has an expiration date. The STA or AP moves, which may cause the reference RSSI to fail. Even if the STA and the AP do not move, the time-selective fading of the channel causes a large change in the channel state. For example, after the STA wakes up from long-term sleep, the reference RSSI measured and stored before sleep should not be used as a parameter to determine the BSS attribution of the received frame, but the reference RSSI should be re-measured. In the time before the reference RSSI is re-measured, the STA should abandon the use of this scheme to judge the BSS attribution of the received target frame. At this time, it should be conservatively considered that the target frame is the BSS frame as long as the color of the target frame matches. .

The solution of the invention is small. According to the current 802.11 standard, when the receiver receives an 802.11 frame, the physical layer (English name: Physical Layer, English abbreviation: PHY) always measures its RSSI and uses the measurement result as RXVECTOR (Receiver Vector). The element informs the MAC layer via the PHY-RXSTART.indication primitive. Therefore, the solution of the present invention is only It is the use of existing measurement results, so it does not lead to additional measurement overhead. The main overhead of the present invention is that the reference RSSI needs to be recorded, and the RSSI of the target frame is compared with the reference RSSI, which results in a small storage and computational overhead.

After determining the BSS of the target frame by the method of the present invention, it can be used to do two things:

1) Set NAV: If the STA determines that the target frame is a BSS frame, it updates its own intra-NAV with the TXOP Duration in HE-SIG-A; if the STA determines that the target frame is an OBSS frame, it uses HE-SIG-A TXOP Duration updates its regular-NAV;

2) Spatial multiplexing: If the STA determines that the target frame is a BSS frame, the STA does not perform spatial multiplexing; if the STA determines that the target frame is an OBSS frame, the STA may perform spatial multiplexing with the target frame if a certain power condition is met. use.

The present invention enables the STA to correctly set the NAV. In the case of a Color collision, the STA can obtain more transmission opportunities and avoid the interference problem caused by the NAV being erroneously released. At the same time, the present invention enables the STA to recognize more OBSS frames, thereby increasing the chance of spatial multiplexing, thereby increasing system throughput. Finally, in the case of Color collision, the STA avoids further processing of the latter part of the physical header of the OBSS frame, thereby making the STA more power efficient.

Based on the foregoing embodiment shown in FIG. 3, the present invention provides a first optional embodiment, which illustrates the solution of the present invention from the perspective that the AP declares that spatial multiplexing is not supported:

The invention requires that the AP does not use power control when transmitting. However, 802.11ax explicitly mentions that when the device performs spatial multiplexing, power control can be used, that is, the transmission power is appropriately reduced to avoid causing too much interference to the ongoing transmission. When the transmission of the AP uses power control, the solution of the present invention is not applicable.

To ensure that the AP does not use power control when transmitting, the present invention can be used. One solution is that the AP declares that it does not support spatial multiplexing. For example, the AP declares that it does not support the probe by responding to the Probe Response frame, the association response, the Association Response frame, or the high efficiency (High Efficiency Capabilities, HE) capability information element in the beacon frame, or through other management frames. Spatial reuse. In fact, spatial multiplexing is an optional feature that APs may not support at all. In this case, the AP sends no power control.

At this time, the first condition further includes: before receiving the target frame, the STA receives a first indication from the associated AP, where the first indication indicates that the associated AP does not support spatial multiplexing.

It should be noted that the first indication may be carried by a management frame sent by the AP.

Based on the foregoing embodiment shown in FIG. 3, the present invention provides a second optional embodiment, which illustrates the solution of the present invention from the perspective of indicating whether the current frame adopts power control in the target frame:

Even if the AP supports spatial multiplexing, it does not mean that each target frame it transmits is spatially multiplexed. In fact, in most cases, the frames sent by the AP may not be spatially multiplexed frames, ie, no power control is used. Based on this, a method for determining whether the target frame sent by the AP uses the power control is that the AP indicates whether the current frame is spatially multiplexed or whether the current frame is used in an implicit or display manner in the HE-SIG-A of the physical header of the target frame. The power control includes the following specific implementation methods:

1) The AP carries a spatial multiplexing (English name: Spatial Reuse, SR) in the HE-SIG-A of the physical header of the target frame to indicate whether the current frame is a spatial multiplexing frame.

If SR Yes=0, the current target frame is not a spatial multiplexing frame, so the frame is not used for power control. At this time, the STA can determine the BSS attribution of the frame by the method of the present invention.

Similarly, the SR No indication can also be carried in the HE-SIG-A. When SR No=1, it indicates that the current target frame is not a spatial multiplexing frame. At this time, the STA can determine the BSS attribution of the frame by the method of the present invention.

2) The AP carries an SR allowed indication in the HE-SIG-A in the physical header of the target frame, and is used to indicate whether other devices are allowed to perform spatial multiplexing transmission with the current frame.

In general, if the target frame is a spatially multiplexed frame (that is, it has been spatially multiplexed with other frames), then the target frame should not allow other devices to continue spatial multiplexing with itself, otherwise the target frame will be compared. A high probability transmission failed. Based on this, if the STA receives the SR_allowed=1 in the HE-SIG-A of the physical header of the target frame, the target frame is not necessarily a spatial multiplexing frame, that is, spatial multiplexing is not used. At this time, the STA can determine the BSS attribution of the target frame by using the method of the present invention.

Similarly, the SR disallowed indication can also be carried in the HE-SIG-A. When SR disallowed=0, it indicates that the current target frame is not a spatial multiplexing frame. At this time, the STA can determine the BSS attribution of the frame by the method of the present invention.

3) The AP carries the transmit power control (English full name: Transmit Power Control, English abbreviation: TPC) indication in the HE-SIG-A of the physical header of the target frame, indicating whether the current frame uses power control.

If TPC=0 in the HE-SIG-A of the physical header of the target frame received by the STA, the target frame does not use the power control. At this time, the STA can determine the BSS attribution of the frame by the method of the present invention.

Based on the above discussion, in this case, the first condition further includes: the physical header of the target frame includes the first The second indication is used to indicate that the target frame is not a spatial multiplexing frame, the target frame is allowed to perform spatial multiplexing, or the target frame is not used for power control.

Specifically, the HE-SIG-A of the target frame includes a second indication, which is used to indicate the current frame spatial multiplexing frame, or the current frame allows space, or the current frame does not use power control.

Since the purpose is to determine that the transmission of the target frame is not used, the present embodiment is in a parallel relationship with the first alternative embodiment described above, that is, the two do not have to be used at the same time, and only one of them can be used to achieve the target.

Based on the foregoing embodiment shown in FIG. 3, the present invention provides a third alternative embodiment, which illustrates the solution of the present invention from the perspective of a HE MU PPDU format frame:

The HE MU PPDU itself is transmitted by the AP for DL MU transmission, such as DL MU-MIMO and DL OFDMA. However, the standard does not specify that the HE MU PPDU can not be used for SU transmission, although there is not much benefit in using the HE MU PPDU format frame for SU transmission (because additional transmission of HE-SIG-B is required, the transmission overhead is greater) .

When a STA transmits to a AP or other STA using a frame of the HE MU PPDU format, if a third party device determines the BSS attribution of the frame using the method of the present invention, an error may obviously occur. The method of the present invention is only applicable to the case where the target frame is transmitted by the AP, and therefore, the case of SU transmission using the HE MU PPDU should be excluded.

If at least two users are scheduled in the physical header of the HE MU PPDU format frame, the frame must be sent by the AP. At this time, the STA can determine the BSS attribution of the frame by the method of the present invention. Therefore, in the case where the standard does not prohibit the SU transmission using the HE MU PPDU, the first condition further includes: at least two users are scheduled in the physical header of the target frame of the HE MU PPDU format.

The user information of the physical header scheduling of the HE MU PPDU format frame is carried by the HE-SIG-B, and the HE-SIG-B is located after the HE-SIG-A, but the STA does not always need to solve the HE-SIG-B to determine the scheduling. The number of users. Specifically, if the STA solves the HE-SIG-A, it finds that SIGB Compression=1 (SIG-B compression, indicating full-band MU-MIMO transmission) and MU-MIMO Users>0 (multi-user MIMO user, If the number of users participating in MU-MIMO is greater than 1), it is determined that HE-SIG-B schedules at least two users; if SIGB Compression=0, the STA also needs to resolve HE-SIG-B and according to HE-SIG-B The content determines whether at least two users are scheduled. Among them, "resolving HE-SIG-B" does not mean that all HE-SIG-B content needs to be solved. In fact, the common common part of HE-SIG-B is generally solved (there is no need to solve the following per user part) According to the capital The source allocation information can determine the number of users scheduled by HE-SIG-B.

It should be specially noted that if the STA solves the HE-SIG-B of the HE MU PPDU format frame and includes the STA's own identity, the HE MU PPDU format frame should be considered to contain the data sent to itself, and the STA should follow the corresponding resource. The solution MAC portion is allocated, i.e., the BSS attribution of the frame should not be determined in accordance with the rules of the present invention. At this time, the first condition may further include: the current STA is not included in the plurality of users scheduled by the HE-SIG-B.

This embodiment can be used in combination with the first alternative embodiment or the second alternative embodiment described above.

Referring to FIG. 4, an embodiment of the present invention provides another method for identifying a BSS attribution of a received frame, including:

201. The STA receives the target frame, where the format of the target frame is an HE trigger-based PPDU, and the physical header of the target frame includes a color Color.

202. When the color in the physical header of the target frame matches the color of the STA, the STA determines the BSS attribution of the target frame according to the first rule. The first rule includes: if the STA receives the target frame interval before the predefined time, the STA receives the packet correctly. To the Trigger frame from the BSS, or the STA detects the signal but does not correctly decode the MAC portion of the signal, it determines that the target frame is the BSS frame; if the STA does not detect any signal before the target frame interval is received for a predefined time If the frame received by the STA is not the Trigger frame of the BSS, the target frame is determined to be an OBSS frame.

In this embodiment, the frame of the HE trigger-based PPDU format is necessarily sent by multiple STAs, and the triggered Trigger frame sent by the AP must be used before the frame to schedule transmission of multiple STAs, Trigger frame and HE trigger- Based on the Short Inter-frame Space (English name: SIFS) time in the PPDU format, as shown in Figure 5, the preamble is the preamble, that is, the physical header of the HE trigger-based PPDU, HE. -SIG-A is located there. When the STA receives the frame in the HE trigger-based PPDU format, the information about the frequency domain resource allocation is not known in advance. Therefore, the information such as Color and TXOP Duration can only be obtained according to the HE-SIG-A in the physical header. The MAC part, that is, its BSSID cannot be obtained.

When the STA receives a target frame of the HE trigger-based PPDU format, the BSS attribution of the target frame may be determined according to the following rules: before receiving the target frame interval SIFS of the HE Trigger-based PPDU format,

1) If the STA correctly receives the Trigger frame from the BSS, or the STA detects the signal but does not If the MAC part of the signal is correctly solved, it is determined that the target frame is a BSS frame;

2) If the STA does not detect any signal, or the frame received by the STA is not the Trigger frame of the BSS, it is determined that the target frame is an OBSS frame.

The "STA detects the signal" means that the STA finds that the received signal strength is greater than the energy detection threshold (for example, -62 dBm) by energy detection, or finds a valid 802.11 frame physical header by signal detection; "the STA correctly receives the X frame" means The STA correctly solves the MAC part of the signal, and finds that the type of the frame carried by the MAC part is an X frame; the "received frame is not an X frame" means that the STA correctly solves the MAC part of the signal, and finds that the MAC part carries The type of the frame is not an X frame; the frame received by the STA is not the Trigger frame of the BSS. Specifically, the frame received by the STA is a Trigger frame of the OBSS, or other types of frames from the BSS or the OBSS. . FIG. 6 is a schematic flowchart of identifying a BSS attribution when a STA receives a target frame of a color matching HE trigger-based PPDU format.

It should be specially noted that the AP may adopt a multi-BSSID mechanism, that is, the AP virtualizes multiple BSSs. Since these BSSs use the same Color and the APs of multiple virtual BSSs are the same physical entity, these BSS frames should be considered as the BSS frames. An achievable method is that the AP notifies the STA of all BSSIDs that are virtualized by itself. When the BSSID field in the Trigger frame received by the STA is the same as any one of the virtual BSSIDs notified by the AP, the Trigger frame is considered to be the BSS frame; otherwise, the Trigger frame is considered to be the OBSS frame. Another achievable method is that the AP sends a Trigger frame always sent by the primary BSSID, that is, the BSSID field carries the primary BSSID, and the primary BSSID can be recognized by the STAs associated with the AP but belonging to different virtual BSSs. At this time, the STA considers the Trigger frame as the BSS frame only when the BSSID field in the Trigger frame received by the STA is the primary BSSID; otherwise, the Trigger frame is considered to be the OBSS frame.

The method for identifying the BSS attribution of the received frame in the embodiment of the present invention is described above by using the embodiment. The following describes the device for identifying the BSS belonging to the received frame in the embodiment of the present invention.

An embodiment of the present invention provides a device for identifying a BSS belonging to a received frame, as described in any one of claims 12 to 20, and the specific structure thereof may be as shown in FIG. 7, wherein the device 30 correspondingly identifies the BSS attribution of the received frame. device of. The device is composed of three parts: a receiving module 301, configured to receive a reference frame from a device-associated AP, and to receive a target frame, the format of the target frame is HE MU PPDU format, HE SU PPDU format of DL or HE ER of DL SU PPDU format, object of the target frame The measurement module 302 is configured to measure the received signal strength of the reference frame, obtain a reference RSSI, and measure the received signal strength of the target frame to obtain a first RSSI; the determining module 303 is configured to When the target frame satisfies the first condition, and the absolute value of the difference between the first RSSI and the reference RSSI is less than a predefined value, the target frame is determined to be a BSS frame, and the first condition includes: Color and STA in the physical header of the target frame. Color matches.

Wherein, since the storage needs to be stored after the reference RSSI is obtained, the device 10 actually includes a storage module, which is not shown in FIG. In a specific implementation, the receiving module 301 and the measuring module 302 can be implemented by a radio frequency and a front end circuit, and the determining module 303 can be implemented by a general purpose processor, for example, in a CPU.

In this embodiment, the color matching is no longer the only condition for determining that the target frame is the BSS frame. The introduction of the RSSI-based determination method enables the STA to correctly determine a part of the HE PPDU format frame in the case of the Color conflict of the adjacent BSS. The BSS is assigned, and then the correct NAV is selected to be updated, which avoids the interference caused by the error release of the NAV, increases the chance of STA transmission, and increases the probability that the STA performs spatial multiplexing, thereby improving the overall throughput of the system.

The embodiment of the present invention further provides an apparatus for identifying a BSS belonging to a received frame, as described in any one of claims 21 to 22, and the specific structure thereof may be as shown in FIG. 8, wherein the device 40 correspondingly identifies the BSS of the received frame. Affiliated device. The device is composed of three parts: a receiving module 401, configured to receive a target frame, the target frame is an HE trigger-based PPDU format, and the physical header includes a color, and is also used to signal the signal before receiving the target frame interval for a predefined time. Performing a test to obtain a first detection result. The determining module 402 is configured to determine, when the color in the physical head of the target frame matches the color of the device, determine the BSS attribution of the target frame according to the first rule, where the first rule includes: if the first detection The result includes a Trigger frame from the BSS, or the first detection result is that the signal is detected but the signal MAC part is not correctly decoded, then the target frame is determined to be the BSS frame; if the first detection result is that no signal is detected, or The first detection result is that the signal MAC part is correctly decoded but the Trigger frame of the BSS is not included, and then the target frame is determined to be an OBSS frame.

The first detection result may be: no signal is detected, the signal is detected but the MAC part is not solved, and the MAC part is correctly solved. The specific frame type included in the MAC portion is judged by the type information in the MAC frame header. "Detected signal but unsolved MAC portion" can also be divided into two cases, namely, energy is detected but a valid 802.11 physical header is not recognized, a valid 802.11 physical header is identified but the MAC portion is not correctly resolved. Since the storage needs to be stored after the reference RSSI is obtained, the device 40 is actually implemented. Also included is a storage module, not shown in Figure 8. In a specific implementation, the receiving module 401 can be implemented by a radio frequency and a front end circuit, and the determining module 402 can be implemented by a general purpose processor, for example, in a CPU.

In this embodiment, the color matching is no longer the only condition for determining the target frame as the BSS frame. For the target frame of the HE trigger-based PPDU format, determining the BSS attribution according to the reception condition of the previous Trigger frame can effectively solve the Color conflict situation. The HE trigger-based PPDU from the OBSS is determined to be a problem of the BSS frame. When the target frame is determined to be an OBSS frame, the STA sets the regular-NAV, which can bring more transmission opportunities to the STA; and the STA can perform spatial multiplexing transmission at this time, thereby improving the throughput of the entire system.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention is essential or the part contributing to the prior art or the entire technical solution. The portion or portion may be embodied in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the various aspects of the present invention. All or part of the steps of the method described in the examples. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims

A method for identifying a BSS attribution of a basic service set of a received frame, comprising:

The station STA receives the reference frame from the associated access point AP, and measures the received signal strength of the reference frame to obtain a reference received signal strength indicator RSSI;

Receiving, by the STA, a target frame, and measuring a received signal strength of the target frame, to obtain a first RSSI, where the format of the target frame is HE MU PPDU format, HE SU PPDU format of downlink DL, or HE ER SU of DL In the PPDU format, the physical header of the target frame includes a color Color;

When the target frame satisfies the first condition, and the absolute value of the difference between the first RSSI and the reference RSSI is less than a predefined value, the STA determines that the target frame is a BSS frame, the first The condition includes: Color in the physical header of the target frame matches Color of the STA.
The method according to claim 1, wherein when the target frame satisfies a first condition, and an absolute value of a difference between the first RSSI and the reference RSSI is greater than a predefined value, the STA determines The target frame is an overlapping basic service set OBSS frame.
The method according to claim 1 or 2, wherein the first condition further comprises: before receiving the target frame, the STA receives a first indication from the associated AP, the first An indication indicates that the associated AP does not support spatial multiplexing.
The method according to claim 1 or 2, wherein the first condition further comprises: a second indication included in a physical header of the target frame, the second indication being used to indicate that the target frame is not a space The multiplex frame, the target frame allows spatial multiplexing or the target frame does not use power control.
The method according to any one of claims 1 to 4, wherein when the format of the target frame is a HE MU PPDU format, the first condition further comprises: the target frame scheduling at least two users .
The method according to claim 5, wherein the target frame schedules at least two users, including: the STA according to HE-SIG-A and/or HE-SIG in a physical header of the target frame -B determines whether at least two users are scheduled for the target frame.
The method according to claim 5 or 6, wherein the first condition further comprises that the STA is not included in the at least two users scheduled by the target frame.
The method according to any one of claims 1 to 4, wherein when the format of the target frame is a HE SU PPDU format of a downlink DL or a HE ER SU PPDU format of a DL, The first condition further includes: before receiving the target frame, the STA receives a third indication from the associated AP, where the third indication indicates that no tunnel direct link establishes TDLS or direct chain in the BSS. The road establishes a DLS transmission, or the TDLS or DLS transmission is prohibited in the BSS.
The method according to any one of claims 1 to 8, wherein the reference frame is a beacon Beacon frame.
A method for identifying a BSS attribution of a basic service set of a received frame, comprising:

The STA receives the target frame, and the format of the target frame is an HE trigger-based PPDU, and the physical header of the target frame includes a color Color.

When the color in the physical header of the target frame matches the color of the STA, the STA determines the BSS attribution of the target frame according to the first rule, where the first rule includes: if the target is received Before the frame interval is predefined, the STA correctly receives the Trigger frame from the BSS, or the STA detects the signal but does not correctly solve the media access control MAC part of the signal, and determines that the target frame is The BSS frame; if the STA does not detect any signal before the target frame interval is preset, or the frame received by the STA is not the Trigger frame of the BSS, it is determined that the target frame is overlapped The basic service set OBSS frame.
The method according to claim 10, wherein the predefined time is a short interframe space SIFS.
A device for identifying a BSS belonging to a basic service set of a received frame, comprising:

a receiving module, configured to receive a reference frame from the device-associated AP, and to receive the target frame, where the format of the target frame is HE MU PPDU format, HE SU PPDU format of downlink DL, or HE ER SU of DL In the PPDU format, the physical header of the target frame includes a color Color;

a measuring module, configured to measure a received signal strength of the reference frame, obtain a reference received signal strength indicator RSSI, and measure a received signal strength of the target frame to obtain a first RSSI;

a determining module, configured to determine that the target frame is a BSS frame when the target frame satisfies a first condition, and an absolute value of a difference between the first RSSI and the reference RSSI is less than a predefined value, The first condition includes: Color in the physical header of the target frame matches Color of the STA.
The device according to claim 12, wherein the determining module is further configured to: when the target frame satisfies a first condition, and the difference between the first RSSI and the reference RSSI is When the value is greater than the predefined value, it is determined that the target frame is an overlapping basic service set OBSS frame.
The device according to claim 12 or 13, wherein the first condition further comprises: before receiving the target frame, the receiving module receives a first indication from the associated AP, The first indication indicates that the associated AP does not support spatial multiplexing.
The device according to claim 12 or 13, wherein the first condition further comprises: a second indication is included in a physical header of the target frame, and the second indication is used to indicate that the target frame is not a space The multiplex frame, the target frame allows spatial multiplexing or the target frame does not use power control.
The device according to any one of claims 12 to 15, wherein when the format of the target frame is an HE MU PPDU format, the first condition further includes: the target frame scheduling at least two users .
The device according to claim 16, wherein the target frame schedules at least two users, comprising: the determining module according to HE-SIG-A and/or HE- in a physical header of the target frame. The SIG-B determines whether the target frame has scheduled at least two users.
The device according to claim 16 or 17, wherein the first condition further comprises that the STA is not included in the at least two users scheduled by the target frame.
The device according to any one of claims 12 to 15, wherein when the format of the target frame is a HE SU PPDU format of a downlink DL or a HE ER SU PPDU format of a DL, the first condition further includes: Before receiving the target frame, the receiving module receives a third indication from the associated AP, where the third indication indicates that no tunnel direct link establishment TDLS or direct link establishment DLS transmission in the BSS, or TDLS or DLS transmission is prohibited in this BSS.
The device according to any one of claims 12 to 19, wherein the reference frame is a beacon Beacon frame.
A device for identifying a BSS belonging to a basic service set of a received frame, comprising:

a receiving module, configured to receive a target frame, where the format of the target frame is an HE trigger-based PPDU, where the physical header of the target frame includes a color Color, and is further configured to: before receiving the target frame interval, a predefined time The signal is detected to obtain the first detection result;

a determining module, configured to determine, when the color in the physical header of the target frame matches the color of the STA, the BSS attribution of the target frame according to the first rule, where the first rule includes: if the first The detection result includes a Trigger frame from the BSS, or the first detection result is detection If the signal is not correctly solved, the target MAC frame is determined to be a BSS frame; if the first detection result is that no signal is detected, or the first detection result is a correct solution Describe the signal MAC part but the MAC part does not include the Trigger frame of the BSS, and then determine that the target frame is an overlapping basic service set OBSS frame.
The device according to claim 21, wherein the predefined time is a short interframe space SIFS.