CN103001681B - Detection method, detection system and detection equipment - Google Patents

Detection method, detection system and detection equipment Download PDF

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Publication number
CN103001681B
CN103001681B CN201110271891.0A CN201110271891A CN103001681B CN 103001681 B CN103001681 B CN 103001681B CN 201110271891 A CN201110271891 A CN 201110271891A CN 103001681 B CN103001681 B CN 103001681B
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described
beam forming
aid
equipment
station information
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CN201110271891.0A
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CN103001681A (en
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刘孟红
夏林峰
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华为技术有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks

Abstract

An embodiment of the invention discloses a detection method, a detection system and detection equipment which are applied to the technical field of communication. The detection method includes that detection for fields containing power-saving flags is omitted after a beamformee receives an NDP (null data packet) frame, so that the beamformee cannot enter a sleep state, and computed channel feedback information can be fed to a beamformer within the duration of a transmit opportunity. The detection method, the detection system and the detection equipment have the advantages that the beamformer and the beamformee do not need to carry out operation for the fields containing the power-saving flags in the NDP frame, in other words, the purpose of normal feedback can be achieved without cooperation of the beamformer and the beamformee, and accordingly a detection process is simplified.

Description

A kind of detection method, system and equipment

Technical field

The present invention relates to communication technical field, particularly detection method, system and equipment.

Background technology

802.11 is WLAN standard that IEEE group formulates, wherein use medium education (Medium access control, MAC) layer is that multiple websites in same network set up addressing and channel access controlling mechanism, makes the communication between multi-site become possibility.

The complementary agreement IEEE802.11ac of this standard has also formulated high-throughput detection mechanism (VHT Sounding Protocol) in WLAN (wireless local area network), namely the channel detecting mechanism between beam forming initiating equipment (Beamformer) and beam forming receiving equipment (Beamformee), by this mechanism, beam forming initiating equipment better can know the channel situation between beam forming receiving equipment, thus reaches by adjustment relevant parameter the object improving communication conditions.Particularly, realized by following process:

At transmission opportunity (Transmit opportunity, TXOP) in time, beam forming initiating equipment can send empty bag notice (Null Data Packet Announcement, NDPA) frame gives all relevant beam forming receiving equipments, to notify that beam forming receiving equipment is carried out detection and prepared;

Then beam forming initiating equipment can send empty bag (Null Data Packet, NDP) frame, after all relevant beam forming receiving equipments receive this NDP frame, all can calculate relevant channel feedback information, and feed back.Wherein at multi-user's multiple-input, multiple-output (Multi-user multiple input multiple output, MU-MIMO) under scene, some beam forming receiving equipment just feeds back receiving NDP frame, and some beam forming receiving equipment feeds back after the beam forming report queries (Beamforming Repot Poll) sent at subsequently received beam forming initiating equipment.

In existing high-throughput detection process, beam forming initiating equipment can comprise power saving flag bit (TXOP_PS_NOT_ALLOWED) field in the NDP frame sent, and beam forming receiving equipment is after receiving this NDP frame, this power saving flag bit field can be detected, if the value of this field is 0, then beam forming recipient just enters sleep state and can not feed back, if the value of this field is 1, then beam forming recipient would not enter sleep state.In above-mentioned existing process, the setting of power saving flag bit field must be carried out in beam forming promoter one end, and carry out the detection of this field in beam forming recipient one end, make testing process more loaded down with trivial details.

Summary of the invention

The embodiment of the present invention provides a kind of detection method, system and equipment, beam forming initiating equipment and receiving equipment can not be needed to carry out the power saving flag bit field in NDP frame processing the object that just can reach Normal Feedback, simplify detection flow process.

The embodiment of the present invention provides a kind of detection method, comprising:

The sky bag NDP frame that beam forming receiving equipment received beam shaping initiating equipment sends, ignores the detection to the power saving flag bit field comprised in described NDP frame;

Within the transmission opportunity TXOP time, the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment by described beam forming receiving equipment.

The embodiment of the present invention provides a kind of beam forming receiving equipment, comprising:

Empty bag receiving element, for the sky bag NDP frame that received beam shaping initiating equipment sends, ignores the detection to the power saving flag bit field comprised in described NDP frame;

Feedback unit, within the transmission opportunity TXOP time, feeds back to described beam forming initiating equipment by the channel feedback information calculated according to described NDP frame.

The embodiment of the present invention provides a kind of detection system, comprising: beam forming initiating equipment and at least one beam forming receiving equipment;

Described beam forming initiating equipment, for sending empty bag NDP frame;

Described beam forming receiving equipment, for receiving described sky bag NDP frame, ignores the detection to the power saving flag bit field comprised in described NDP frame; And within the transmission opportunity TXOP time, the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment.

In the high-throughput detection method of the embodiment of the present invention, beam forming receiving equipment is after receiving NDP frame, ignore the detection to the power saving flag bit field wherein comprised, and within the transmission opportunity time, the channel feedback information of calculating is fed back to beam forming initiating equipment by beam forming receiving equipment.The method of the embodiment of the present invention does not need beam forming initiating equipment and receiving equipment to the operation of the power saving flag bit field in NDP frame, does not namely need the cooperation of these two equipment just can reach the object of Normal Feedback, thus simplifies detection flow process.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the flow chart of a kind of detection method that the embodiment of the present invention provides;

Fig. 2 is the detection process carried out under MU-MIMO scene in the embodiment of the present invention;

Fig. 3 is the structural representation of NDPA frame in the embodiment of the present invention;

Fig. 4 is the detection process carried out under SU-MIMO scene in the embodiment of the present invention;

Fig. 5 is the wlan system structural representation that the method provided in the embodiment of the present invention is applied;

Fig. 6 is the detection method flow chart carried out under SU-MIMO scene in the embodiment of the present invention;

Fig. 7 is the detection method flow chart carried out under MU-MIMO scene in the embodiment of the present invention

Fig. 8 is the structural representation of a kind of beam forming initiating equipment that the embodiment of the present invention provides;

Fig. 9 is the structural representation of the another kind of beam forming initiating equipment that the embodiment of the present invention provides.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

The embodiment of the present invention provides a kind of detection method, beam forming receiving equipment and the method performed by Beamformee, MU-MIMO and single user multiple-input, multiple-output (Single-user multipleinput multiple output can be applied to, SU-MIMO) under scene, the flow chart of the method as shown in Figure 1, comprising:

Step 101, the sky bag NDP frame that beam forming receiving equipment received beam shaping initiating equipment and Beamformer send, ignores the detection to the power saving flag bit field comprised in NDP frame.

Step 102, within the transmission opportunity TXOP time, the channel feedback information calculated according to NDP frame is fed back to beam forming initiating equipment by beam forming receiving equipment.

Be appreciated that the process that high-throughput detects is carried out within the TXOP time, during this period of time, exclusive media resource, can send single or multiple Frame.TXOP has the longest time limit, needs to compete to obtain after it terminates again.

(1) the high-throughput detection process carried out under MU-MIMO scene as shown in Figure 2

Within the TXOP time, beam forming initiating equipment first can broadcast a NDPA frame, to notify that the beam forming receiving equipment of being correlated with is carried out detection and prepared, wherein the form of this NDPA frame as shown in Figure 3, comprise: frame control, duration, receiver address (RA), transmission address (TA), detection (Sounding) sequence, multiple site information (STA Information, STA Info) and Frame Check Sequence (Frame CheckSequence, FCS).Wherein detection sequence field comprises again sequence number and reserved field; Comprise again and connect ID (AID), distinguish feedback kind (Feedback Type) and feedback dimension (NC Index) field of feedback scene in site information; And under MU-MIMO scene, what destination address field was filled is broadcast address, and feedback kind is all set to 1, feedback dimension is set to the spatial stream number needing feedback.

Each beam forming receiving equipment is after receiving NDPA frame, can check whether the AID in the station information fields that wherein comprises has consistent with the AID of oneself, namely refer to identical, if find the AID identical with this beam forming receiving equipment, stop searching, and according to corresponding feedback type field and feedback dimension field, in detection process subsequently, pass through high-throughput beam forming compressed package (VHT CompressedBeamforming) to beam forming initiating equipment feedback channel feedback information; If do not find consistent AID, then do not feed back.

Broadcasting short frame pitch (the Short Inter-Frame Space of NDPA frame, SIFS) after, beam forming initiating equipment can broadcast a NDP frame to detect, in NDP frame, contain the information such as power saving flag bit field, the value of this power saving flag bit field can not be filled.

After each relevant beam forming receiving equipment receives this NDP frame, ignore the detection to the power saving flag bit field wherein comprised, such beam forming receiving equipment would not enter sleep state, thus calculate relevant channel feedback information, and within the TXOP time, the channel feedback information of calculating is fed back to beam forming initiating equipment.When feeding back, only having the beam forming receiving equipment that the AID in first station information fields comprised in NDPA frame is consistent with self AID, just can carry out feedback channel feedback information receiving NDP frame; For other beam forming receiving equipments, only when receiving the beam forming report queries of the follow-up transmission of beam forming initiating equipment, the channel feedback information of just feedback calculating.

(2) the high-throughput detection process carried out under SU-MIMO scene as shown in Figure 4

High-throughput detection process under this scene and the process under MU-MIMO scene similar, unlike spatial flows all under SU-MIMO scene only for a beam forming receiving equipment, then beam forming initiating equipment only comprises a station information fields in the NDPA frame sent, and receiver address is unicast address, feedback kind is set to 0, and feedback dimension is set to retention (beam forming receiving equipment can select the spatial stream number returned voluntarily); After beam forming receiving equipment receives NDPA frame, carry out detection and prepare; And after the NDP frame receiving the transmission of beam forming initiating equipment, ignore the detection to the power saving flag bit field wherein comprised, thus can not sleep state be entered, calculate relevant channel feedback information and also feed back to beam forming initiating equipment.

It should be noted that, the channel feedback information that usual spatial flow is relevant mainly comprises average signal-to-noise ratio (Average SNR) information corresponding to each spatial flow (Space-Time Stream); V matrix (Feedback Matrix V) information; With signal to noise ratio difference (Delta SNR) information etc.After beam forming promoter receives these feedback informations, relevant Q operation matrix (SteeringMatrix Q) can be calculated according to these information (also may can consider the feedback information that other beam forming receiving equipments send), instruct follow-up transmitting-receiving work to improve the communication performance of whole system.

Visible, in the high-throughput detection method of the embodiment of the present invention, beam forming receiving equipment is after receiving NDP frame, ignore the detection to the power saving flag bit field wherein comprised, thus can not sleep state be entered, within the transmission opportunity time, the channel feedback information of calculating will be fed back to beam forming initiating equipment like this.The method of the embodiment of the present invention does not need beam forming initiating equipment and receiving equipment to the operation of the power saving flag bit field in NDP frame, does not namely need the cooperation of these two equipment just can reach the object of Normal Feedback, thus simplifies detection flow process.

The method of the embodiment of the present invention is described with a concrete application examples below, be particularly applicable in WLAN (wireless local area network) (WLAN) system as shown in Figure 5, comprise multiple Basic Service Set (BasicService Set within the system, BSS), comprise the website (Station, STA) of multiple association at BSS network, the central STA wherein with full-time administrative BSS is called access point (Access point, AP), other STA associates with AP.And multiple BSS Netcom crosses distributed system (Distribution System, DS) and is interconnected and can forms extended service set (Extended Service Set, ESS); If when AP lacks, STA also can ad-hoc network and mutually direct communication, and this network is independently BSS (IBSS), the BSS1 in such as Fig. 5.

In the present embodiment, AP is beam forming initiating equipment, and STA is beam forming receiving equipment, then the high-throughput detection method flow chart carried out under SU-MIMO scene as shown in Figure 6, comprising:

Step 201, AP sends NDPA frame, and the receiver address comprised in NDPA frame is the unicast address of STA, and has a station information fields, comprises AID, feedback kind and feedback dimension field at station information fields.

Step 202, after STA receives this NDPA frame, obtains the AID of the station information fields wherein comprised, and mates with the AID of this STA, if unanimously, then performs step 203, if inconsistent, then and process ends.

Step 203, the information such as the feedback kind in NDPA frame and feedback dimension are preserved by STA.

And after AP a period of time after have sent NDPA frame, sending NDP frame to carry out detection process, STA can detect whether receive this NDP frame, if received, then performs step 204, if do not received, then continues to detect whether receive NDP frame.

Step 204, STA ignores the detection to the power saving flag bit field comprised in NDP frame, does not enter sleep state, then within the TXOP time, by the channel feedback information calculated according to NDP frame, feed back to AP according to the feedback dimension of preserving in step 203 and feedback kind.

The high-throughput detection method flow chart carried out under MU-MIMO scene as shown in Figure 7, comprising:

Step 301, AP broadcasts NDPA frame, and the form of NDPA frame as shown in Figure 3, wherein includes multiple station information fields, comprises AID, feedback kind and feedback dimension field at each station information fields.

Step 302, after STA receives this NDPA frame, obtain the AID of first station information fields, and mate with the AID of this STA, if consistent, then perform step 303 and 304, if inconsistent, then obtain AID in the station information fields after first station information fields, and the AID of acquisition is mated with the AID of this STA, if find that the AID of the AID of all station information fields and this STA is inconsistent, then process ends, if afterwards have AID in a station information fields consistent with the AID of this STA, then perform step 303 and 304.

Step 303, the information such as the feedback kind in NDPA frame and feedback dimension are preserved by STA.

And after AP a period of time after broadcasting NDPA frame, broadcast NDP frame is to carry out detection process, STA can detect whether receive this NDP frame, if received, then performs step 304, if do not received, then continues to detect whether receive NDP frame.

Step 304, STA ignores the detection to the power saving flag bit field comprised in NDP frame, does not enter sleep state, and within the TXOP time, the channel feedback information that STA will calculate according to NDP frame, feeds back to AP according to the feedback dimension of preserving in step 303 and feedback kind.

Further, if when in AID and the NDPA frame of self, the AID of the first station information fields is consistent, the channel feedback information of calculating just can be fed back to AP by STA after receiving NDP frame; And in AID and the NDPA frame of self after first station information fields, when the AID of arbitrary station information fields is consistent, after the beam forming report queries receiving AP transmission, the channel feedback information of calculating can be fed back to AP.

It should be noted that, above-described embodiment is the network for there being BSS to form, and for non-BSS ad-hoc network, beam forming initiating equipment can be certain STA, and beam forming receiving equipment can be other STA.

The embodiment of the present invention also provides a kind of beam forming receiving equipment, such as, website in Fig. 5, and structural representation as shown in Figure 8, comprising:

Empty bag receiving element 10, for the sky bag NDP frame that received beam shaping initiating equipment sends, ignores the detection to the power saving flag bit field comprised in described NDP frame;

Feedback unit 20, within the transmission opportunity TXOP time, feeds back to described beam forming initiating equipment by the channel feedback information that the NDP frame received according to described empty bag receiving element 10 calculates.

In the equipment of the embodiment of the present invention, empty bag receiving element 10 is after receiving NDP frame, ignore the detection to the power saving flag bit field wherein comprised, thus can not sleep state be entered, the channel feedback information of calculating within the transmission opportunity time, will be fed back to beam forming initiating equipment by such feedback unit 20.Beam forming initiating equipment and receiving equipment so just can not be needed the operation of the power saving flag bit field in NDP frame, namely do not need the cooperation of these two equipment just can reach the object of Normal Feedback, thus simplify detection flow process.

Shown in figure 9, in a specific embodiment, beam forming receiving equipment, except comprising structure as shown in Figure 8, can also comprise and notify empty bag receiving element 30, report receiving element 40, first matching unit 50 and the second matching unit 60, wherein:

Notify empty bag receiving element 30, for receiving the sky bag notice NDPA frame that described beam forming initiating equipment sends;

Report receiving element 40, for receiving the beam forming report queries that described beam forming initiating equipment sends;

By described, first matching unit 50, for notifying that the AID in first station information fields comprised in the NDPA frame that control receiving element 30 receives mates with the AID of beam forming receiving equipment;

Second matching unit 60, for when the AID of the AID in first station information fields comprised in the NDPA frame that described first matching unit 50 mates and beam forming receiving equipment is inconsistent, obtain the AID in the station information fields after first station information fields, and the AID of acquisition is mated with the AID of described beam forming receiving equipment.

In the present embodiment, under MU-MIMO scene, after notifying that empty bag receiving element 30 receives NDPA frame, in this NDPA frame, comprise multiple station information fields, comprise in each station information fields and connect ID AID; AID in the station information fields of first wherein can mate with the AID of this equipment by the first matching unit 50, if consistent, then after empty bag receiving element 10 receives NDP frame, ignore the detection to power saving flag bit field wherein, calculate channel feedback information according to NDP frame, and by feedback unit 20, the channel feedback information of calculating is fed back to described beam forming initiating equipment;

If the result that the first matching unit 50 mates is that the AID of AID and this equipment in first station information fields is inconsistent, AID in the station information fields then obtaining after first station information fields by the second matching unit 50 also mates with the AID of this STA, if the result that the second matching unit 60 mates is that the AID in NDPA frame after the first station information fields in any one station information fields is consistent with the AID of this equipment, then after empty bag receiving element 10 receives NDP frame, ignore the detection to power saving flag bit field wherein, channel feedback information is calculated according to NDP frame, and after report receiving element 40 receives beam forming report queries, by feedback unit 20, the channel feedback information of calculating is fed back to described beam forming initiating equipment.

If under SU-MIMO scene, when notifying to comprise a station information fields in the NDPA frame that empty bag receiving element 30 receives, and in station information fields, comprise connection ID AID, AID in one of them station information fields can mate with the AID of this equipment by the first matching unit 50, if consistent, then after empty bag receiving element 10 receives NDP frame, ignore the detection to power saving flag bit field wherein, calculate channel feedback information according to NDP frame, and by feedback unit 20, the channel feedback information of calculating is fed back to described beam forming initiating equipment.

The embodiment of the present invention also provides a kind of detection system, comprising: beam forming initiating equipment and at least one beam forming receiving equipment, wherein:

Beam forming initiating equipment, for sending empty bag NDP frame;

Beam forming receiving equipment, for receiving described sky bag NDP frame, ignores the detection to the power saving flag bit field comprised in described NDP frame; And within the transmission opportunity TXOP time, the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment.

Wherein the structure of beam forming receiving equipment as shown in Fig. 8 or Fig. 9, can not repeat at this.

One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, and storage medium can comprise: read-only memory (ROM), random access memory (RAM), disk or CD etc.

Above to detection method, system and equipment that the embodiment of the present invention provides, be described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (12)

1. a detection method, is characterized in that, comprising:
The sky bag notice NDPA frame that beam forming receiving equipment received beam shaping initiating equipment sends, comprises at least one station information fields in described NDPA frame, comprises and connect ID AID in each station information fields;
If at least one station information fields described, connection ID AID in a station information fields is consistent with the AID of beam forming receiving equipment, after then described beam forming receiving equipment receives the sky bag NDP frame of described beam forming initiating equipment transmission, ignore the detection to the power saving flag bit field comprised in described NDP frame;
Within the transmission opportunity TXOP time, the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment by described beam forming receiving equipment.
2. the method for claim 1, is characterized in that, described method comprises multiple station information fields in described NDPA frame under being used for the scene of multi-user's multiple-input, multiple-output MU-MIMO, comprises and connect ID AID in each station information fields;
If the connection ID AID in first station information fields comprised in described NDPA frame is consistent with the AID of beam forming receiving equipment, then described beam forming receiving equipment is after receiving described NDP frame, and the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment.
3. method as claimed in claim 2, is characterized in that, if when the AID of the AID in first station information fields comprised in described NDPA frame and beam forming receiving equipment is inconsistent,
Obtain the AID in the station information fields after first station information fields, and the AID of acquisition is mated with the AID of described beam forming receiving equipment, when after AID in any one station information fields consistent with the AID of described beam forming receiving equipment, the channel feedback information calculated according to described NDP frame, after receiving described NDP frame, is fed back to described beam forming initiating equipment by described beam forming receiving equipment.
4. method as claimed in claim 3, is characterized in that, also comprise before described channel feedback information is fed back to described beam forming initiating equipment:
Receive the beam forming report queries that described beam forming initiating equipment sends.
5. the method as described in any one of Claims 1-4, is characterized in that, described method comprises a station information fields under being used for the scene of single user multiple-input, multiple-output SU-MIMO in described NDPA frame, comprises and connect ID AID in described station information fields;
If the connection ID AID in the station information fields comprised in described NDPA frame is consistent with the AID of beam forming receiving equipment, then described beam forming receiving equipment is after receiving described NDP frame, and the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment.
6. a beam forming receiving equipment, is characterized in that, comprising:
Notify empty bag receiving element, for receiving the sky bag notice NDPA frame that described beam forming initiating equipment sends, comprising at least one station information fields in described NDPA frame, comprising in each station information fields and connect ID AID;
Empty bag receiving element, for at least one station information fields described, when connection ID AID in a station information fields is consistent with the AID of beam forming receiving equipment, the sky bag NDP frame that received beam shaping initiating equipment sends, ignores the detection to the power saving flag bit field comprised in described NDP frame;
Feedback unit, within the transmission opportunity TXOP time, feeds back to described beam forming initiating equipment by the channel feedback information calculated according to described NDP frame.
7. equipment as claimed in claim 6, is characterized in that, if comprise multiple station information fields in the described NDPA frame that receives of described notice empty bag receiving element, comprise when connecting ID AID in each station information fields, described equipment also comprises:
First matching unit, mates with the AID of beam forming receiving equipment for the AID described notice controlled in first station information fields comprised in the NDPA frame of receiving element reception;
Described feedback unit, for when the AID in first station information fields comprising in the NDPA frame of described first matching unit coupling consistent with the AID of beam forming receiving equipment, then after described empty bag receiving element receives described NDP frame, described channel feedback information is fed back to described beam forming initiating equipment.
8. equipment as claimed in claim 7, it is characterized in that, also comprise: the second matching unit, for when the AID of the AID in first station information fields comprised in the NDPA frame of described first matching unit coupling and beam forming receiving equipment is inconsistent, obtain the AID in the station information fields after first station information fields, and the AID of acquisition is mated with the AID of described beam forming receiving equipment;
Described feedback unit, consistent with the AID of described beam forming receiving equipment for the AID in any one station information fields after the first station information fields in the NDPA frame of described second matching unit coupling, then after described empty bag receiving element receives described NDP frame, the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment.
9. equipment as claimed in claim 8, is characterized in that, also comprise:
Report receiving element, for receiving the beam forming report queries that described beam forming initiating equipment sends;
Described feedback unit, consistent with the AID of beam forming receiving equipment for the AID in arbitrary station information fields after first station information fields comprised in the NDPA frame of described second matching unit coupling, then after described report receiving element receives described beam forming report queries, described channel feedback information is fed back to described beam forming initiating equipment.
10. equipment as claimed in claim 7, is characterized in that, if the sky bag that the empty bag receiving element of described notice receives notifies to comprise a station information fields in NDPA frame, comprises and connect ID AID in described station information fields;
Described first matching unit, also for being mated with the AID of beam forming receiving equipment by the AID in a described station information fields;
Described feedback unit, consistent with the AID of beam forming receiving equipment for the AID in a station information fields of described first matching unit coupling, then after described empty bag receiving element receives described NDP frame, described channel feedback information is fed back to described beam forming initiating equipment.
11. 1 kinds of detection systems, is characterized in that, comprising: beam forming initiating equipment and at least one beam forming receiving equipment;
Described beam forming initiating equipment, for sending empty bag NDP frame, and for sending empty bag notice NDPA frame, comprising at least one station information fields in described NDPA frame, comprising and connect ID AID in each station information fields;
Described beam forming receiving equipment, for receiving described sky bag notice NDPA frame, and work as at least one station information fields comprised in described NDPA frame, when connection ID AID in a station information fields is consistent with the AID of beam forming receiving equipment, receive described sky bag NDP frame, ignore the detection to the power saving flag bit field comprised in described NDP frame; And within the transmission opportunity TXOP time, the channel feedback information calculated according to described NDP frame is fed back to described beam forming initiating equipment.
12. systems as claimed in claim 11, is characterized in that, described beam forming receiving equipment is the equipment as described in any one of claim 6 to 10.
CN201110271891.0A 2011-09-14 2011-09-14 Detection method, detection system and detection equipment CN103001681B (en)

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