CN103002471B - A kind of method of channel detection, Apparatus and system - Google Patents

A kind of method of channel detection, Apparatus and system Download PDF

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Publication number
CN103002471B
CN103002471B CN201110276263.1A CN201110276263A CN103002471B CN 103002471 B CN103002471 B CN 103002471B CN 201110276263 A CN201110276263 A CN 201110276263A CN 103002471 B CN103002471 B CN 103002471B
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China
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described
broadcast packet
receiving
beam forming
sleep
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CN201110276263.1A
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Chinese (zh)
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CN103002471A (en
Inventor
夏林峰
陈庆勇
王学寰
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华为技术有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]
    • 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
    • Y02D70/40According to the transmission technology
    • Y02D70/44Radio transmission systems, i.e. using radiation field
    • Y02D70/442Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas
    • Y02D70/444Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas

Abstract

Method, the Apparatus and system of a kind of channel detection that the embodiment of the present invention provides, relate to the communications field, in order to when not affecting reception feedback request, and the stand-by period of minimizing receiving station as much as possible, and then reach the object of power saving.This channel detection method comprises: send an empty bag notice NDPA broadcast packet, to notify that all correlation reception websites do detection and prepare; Continue transmission one sky bag NDP broadcast packet, after receiving NDP broadcast packet to make relative station of reception point, calculate each autocorrelative channel feedback information; Receive the channel feedback information that receiving station corresponding to first the receiving station information of carrying in described NDPA broadcast packet sends; Put in order according to site information in described NDPA broadcast packet and send feedback request to other receiving stations successively from front to back, to receive the channel feedback information that other receiving stations described send, the embodiment of the present invention is used for radio communication.

Description

A kind of method of channel detection, Apparatus and system

Technical field

The present invention relates to the communications field, particularly relate to a kind of method of channel detection, Apparatus and system.

Background technology

High-throughput detection mechanism (VHTSoundingProtocol) that wireless communication protocol IEEE-USA (InstituteofElectricalandElectronicsEngineers is called for short IEEE) 802.11ac introduces is the channel detecting mechanism that one is present between beam forming promoter (beamformer) and beam forming recipient (beamformee).By this mechanism, beam forming promoter better can know the channel information between beam forming recipient, thus reaches by adjustment relevant parameter the object improving communication conditions.High-throughput detection mechanism is divided into following two kinds according to its application scenarios: multi-user's multiple-input, multiple-output mechanism (Multi-usermultipleinputmultipleoutput, hereinafter abbreviated as MU-MIMO) and single user multiple-input, multiple-output mechanism (Single-usermultipleinputmultipleoutput, hereinafter abbreviated as SU-MIMO).Under normal circumstances, to Basic Service Set (BasicServiceSet, can BSS be called for short) network that forms, the physical equipment that Beamformer is corresponding is access point (AccessPoint, AP can be called for short), the physical equipment that Beamformee is corresponding is website (Station can be called for short STA); Concerning the ad-hoc network of non-basic service collection, the physical equipment that Beamformer is corresponding can be the physical equipment that certain STA, Beamformee are corresponding can be other STA.

Transmission opportunity (Transmitopportunity can be called for short TXOP) refers to that transmitting station obtains the bounded period of transmission specific communications classification by the competition mechanism of competing cycle.Within a TXOP time limit, compete successful transmitting station and can monopolize media resource, send single or multiple Frame to other websites.TXOP has the longest time limit, needs to compete to obtain after it terminates again.

As shown in Figure 1, within the MU-MIMOTXOP time, transmitting station first can send out an empty bag notice (NullDataPacketAnnouncement, hereinafter referred to as NDPA) broadcast packet notify all relevant receiving stations carry out detection prepare, correlation reception website shown in Fig. 1, for 3, can be more than 2 or 2 in actual applications; Wherein the frame format of NDPA broadcast packet can reference diagram 2.Following transmitting station can send an empty bag (NullDataPacket, hereinafter referred to as NDP) broadcast packet, all relevant receiving stations calculate relevant channel feedback information for the NDP broadcast packet received, but only have after receiving NDP broadcast packet and just can send to transmitting station the channel feedback information calculated immediately when the AID in the AID and first site information (STAInformation, hereinafter referred to as the STAInfo) field of NDPA broadcast packet that previously received of receiving station is equal.Receiving station for other only has just can send to transmitting station the channel feedback information calculated immediately when they receive beam forming report queries (BeamformingRepotPoll) from transmitting station respectively time, and this channel feedback information feeds back corresponding information by high-throughput beam forming compressed package (VHTCompressedBeamforming).

Above-mentionedly carry out in the process of channel detection, within the whole TXOP time period, all receiving stations only have maintenance not enter sleep state until correctly complete feedback or the whole TXOP time has been consumed, otherwise receiving station can owing to entering sleep state and cannot correct received beam shaping report request correctly feeding back in advance.So usually for MU-MIMO scene, except NDPA broadcast packet first STAInfo corresponding to receiving station can feed back immediately except, other are sent out website provides feedback information receiving station by beam forming report initiative, its time being in wait state (namely not entering sleep state) is long, will cause the problem that consumes power is many like this.

Summary of the invention

Embodiments of the invention provide a kind of method, Apparatus and system of channel detection, in order to reach the stand-by period reducing receiving station, and then the object of power saving.

For achieving the above object, embodiments of the invention adopt following technical scheme:

On the one hand, a kind of method of channel detection is provided, comprises:

Send an empty bag notice NDPA broadcast packet, to notify that correlation reception website does detection and prepares;

Continue transmission one sky bag NDP broadcast packet, after receiving NDP broadcast packet to make relative station of reception point, calculate each autocorrelative channel feedback information;

Receive the channel feedback information that receiving station corresponding to first site information of carrying in described NDPA broadcast packet sends;

Put in order according to site information in described NDPA broadcast packet and send feedback request to other receiving stations successively from front to back, to receive the channel feedback information that other receiving stations described send.

On the other hand, a kind of method of channel detection is provided, comprises:

Receive the NDPA broadcast packet that transmitting station sends, do detection and prepare;

Receive the NDP broadcast packet that transmitting station sends, and calculate self relevant channel feedback information;

Enter sleep until when arriving the predetermined length of one's sleep, wake oneself up, to receive the feedback request that transmitting station sends;

After receiving described feedback request, send described channel feedback information to described transmitting station.

On the one hand, a kind of website is provided, comprises:

NDPA broadcast packet transmitting element, for sending an empty bag notice NDPA broadcast packet, to notify that this all correlation reception website does detection and prepares;

NDP broadcast packet transmitting element, for continuing transmission one sky bag NDP broadcast packet, after receiving NDP broadcast packet, calculates each autocorrelative channel feedback information to make relative station of reception point;

First channel feedback information receiving element, for receiving the channel feedback information that receiving station corresponding to first site information of carrying in described NDPA broadcast packet sends;

Second channel feedback information receiving element, sends feedback request to other receiving stations from front to back successively for putting in order according to site information in described NDPA broadcast packet, to receive the channel feedback information that other receiving stations described send.

On the other hand, a kind of website is provided, comprises:

NDPA broadcast packet receiving element, for receiving the NDPA broadcast packet that transmitting station sends, doing detection and preparing;

NDP broadcast packet receiving element, for receiving the NDP broadcast packet that transmitting station sends, and calculates self relevant channel feedback information;

Wakeup unit, for entering sleep until when arriving the predetermined length of one's sleep, wake oneself up, to receive the feedback request that transmitting station sends;

Feedback information transmitting element, for after receiving described feedback request, sends described channel feedback information to described transmitting station.

On the one hand, a kind of wireless communication system is provided, comprises: transmitting station and at least two receiving stations;

The website that described transmitting station provides for one side face;

Receiving station in described at least two receiving stations except first receiving station is the website that above-mentioned another aspect provides.

The embodiment of the present invention provides a kind of method, Apparatus and system of channel detection, because transmitting station sends feedback request to receiving station except the first in order successively, and described receiving station except the first need not this feedback request of wait-receiving mode always, but enter sleep until arrive and just wake oneself the predetermined length of one's sleep up to receive feedback request; So, can when not affecting reception feedback request, the stand-by period of minimizing receiving station as much as possible, and then reach the object of power saving.

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 MU-MIMO scene schematic diagram of mechanism;

Fig. 2 is the frame format of IEEE802.11acNDPA broadcast packet;

The schematic diagram of the channel detection method that Fig. 3 provides for the embodiment of the present invention;

The schematic diagram of the channel detection method that Fig. 4 provides for the another kind of embodiment of the present invention;

The schematic diagram of the channel detection method that Fig. 5 provides for further embodiment of this invention;

Fig. 6 is the schematic flow sheet of the calculating method predetermined length of one's sleep;

Fig. 7 is the schematic diagram of the calculating method predetermined length of one's sleep;

The site structure schematic diagram that Fig. 8 provides for the embodiment of the present invention;

The site structure schematic diagram that Fig. 9 provides for another embodiment of the present invention;

The site structure schematic diagram that Figure 10 provides for further embodiment of this invention.

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 method of channel detection, the method may be used in the MU-MIMO scene of ad-hoc network of network or the non-basic service collection BSS composition formed at a Basic Service Set BSS, the executive agent of each step of the method can be website, concrete in the present embodiment because this website is as the beam forming promoter (beamformer) in high-throughput detection mechanism, therefore this website is called transmitting station.Described method, as shown in Figure 3, comprising:

S101, transmitting station send a NDPA broadcast packet, to notify that this correlation reception website does detection and prepares;

Under normal circumstances, the network form Basic Service Set, the physical equipment that Beamformer is corresponding is access point (AP, AccessPoint), and the physical equipment that Beamformee is corresponding is website (STA, Station); Concerning the ad-hoc network of non-basic service collection, the physical equipment that Beamformer is corresponding can be the physical equipment that certain STA, Beamformee are corresponding can be other STA.

S102, transmitting station continue transmission one sky bag NDP broadcast packet, after receiving NDP broadcast packet, calculate each autocorrelative channel feedback information to make relative station of reception point;

S103, receive the channel feedback information that receiving station corresponding to first site information of carrying in NDPA broadcast packet send;

From the frame format of the NDPA broadcast packet shown in Fig. 2, can see that NDPA broadcast packet carries the individual site information (STAInformation of n (n >=2), STAInfo can be abbreviated as), this illustrates the channel feedback information that this transmitting station needs to receive n receiving station, and this n receiving station and the n entrained by NDPA broadcast packet STAInfo one_to_one corresponding.In all embodiments of the present invention, the receiving station that carry in NDPA broadcast packet i-th (1≤i≤n) individual STAInfo (i.e. STAInfoi) is corresponding is called i-th receiving station; Wherein, i is as the serial number of site information in NDPA broadcast packet.Concrete, each receiving station has one to connect ID (AssociationIdentity, hereinafter abbreviated as AID), and comprises an AID in each STAInfo; If both AID are consistent, then both are corresponding.

In this step, receiving station corresponding to first site information of carrying in NDPA broadcast packet can be called first receiving station; Concrete, first described receiving station refer to that the receiving station that the AID of receiving station is equal with the AID in first STAInfo (i.e. STAInfo1) field in the NDPA broadcast packet received is consistent.First receiving station is after receiving NDP broadcast packet, channel estimating is done and by channel estimation calculation channel feedback information according to the NDP broadcast packet received, do not enter sleep until this channel feedback information is sent to transmitting station, make transmitting station in this step first receive the channel feedback information of first receiving station.

S104, according to site information in NDPA broadcast packet put in order from front to back successively to other receiving stations send feedback request, with receive other receiving stations send channel feedback information.

In described NDPA broadcast packet, site information puts in order as the order of a said n site information.Other websites described refer to the receiving station except first receiving station, are specially the 2nd to the n-th receiving station.

This step is specially transmitting station and sends feedback request, to receive the channel feedback information of these receiving stations to the 2nd to the n-th receiving station successively.In actual applications, transmitting station needs the channel feedback information obtaining receiving station, but, due to the appearance of some abnormal conditions (such as correctly not resolving NDPA frame etc.), also may transmitting station have sent feedback request, but receiving station not transmitting channel feed back to transmitting station.

The method of the channel detection that the embodiment of the present invention provides, in the MU-MIMO scene of the network that transmitting station forms at a BSS or the ad-hoc network that non-basic service collection BSS forms, after sending a NDPA broadcast packet and NDP broadcast packet, receive the channel feedback information that receiving station corresponding to first site information of carrying in NDPA broadcast packet sends; Put in order according to site information in NDPA broadcast packet and send feedback request to other receiving stations successively from front to back, to receive the channel feedback information that other receiving stations send.Send compared with feedback request to other receiving stations except the first at random with transmitting station of the prior art, receiving station except the first need not this feedback request of wait-receiving mode always, but enters sleep until arrive and just wake oneself the predetermined length of one's sleep up to receive feedback request; So, can when not affecting reception feedback request, the stand-by period of minimizing receiving station as much as possible, and then reach the object of power saving.

The embodiment of the present invention provides the method for another kind of channel detection, the method may be used in the MU-MIMO scene of ad-hoc network of network or the non-basic service collection BSS composition formed at a Basic Service Set BSS, the executive agent of each step of the method can be website, concrete in the present embodiment because this website is as the beam forming recipient (beamformee) in high-throughput detection mechanism, therefore this website is called receiving station.And it should be noted that, because first receiving station does not enter sleep, and immediately to transmitting station transmitting channel feedback information, in the process of whole channel detection, identical with existing method for first receiving station; Method shown in Fig. 4 is applicable to other receiving stations except first receiving station.That is, the executive agent of the method be the 2nd to any one in the n-th receiving station.Described method as shown in Figure 4, comprising:

The NDPA broadcast packet that S201, reception transmitting station send, does detection and prepares;

The NDP broadcast packet that S202, reception transmitting station send, and calculate self relevant channel feedback information;

If this step according to prior art can be, receive the NDP broadcast packet that transmitting station sends, do channel estimating according to this NDP broadcast packet of reception, and the channel feedback information of being correlated with by channel estimation calculation self.

S203, enter sleep until when arriving the predetermined length of one's sleep, wake oneself up, with receive transmitting station send feedback request;

Wherein, the described predetermined length of one's sleep can obtain based on experience value, and be stored in advance in advance in receiving station, certainly, also can be stored in the database of other equipment, after receiving station and transmitting station have just connected, and before carrying out S201, each receiving station has read the predetermined length of one's sleep again from database.But in embodiments of the present invention, can with reference to concrete grammar below for how obtaining the predetermined length of one's sleep, this concrete grammar receives NDPA broadcast packet at S201 just to carry out.

So, receiving station except the first can wake oneself up according to the length of one's sleep of presetting, make other receiving stations need not this feedback request of wait-receiving mode always, but enter sleep until arrive and just wake oneself the predetermined length of one's sleep up to receive feedback request, thus, can when not affecting reception feedback request, the stand-by period of minimizing receiving station as much as possible, to reach the object of power saving.

S204, after receiving described feedback request, to transmitting station transmitting channel feedback information.

It should be noted that, the feedback request described in all embodiments of the present invention is beam forming report queries (BeamformingRepotPoll).

To the concrete grammar for how obtaining the predetermined length of one's sleep be elaborated below:

If the executive agent of the method shown in Fig. 4 is receiving station (i.e. second receiving station) corresponding to second site information that NDPA broadcast packet records, then when carrying out step S203, the predetermined length of one's sleep is the duration of a short frame pitch (ShortInter-FrameSpace can be abbreviated as SIFS).Can be stored in advance in this predetermined length of one's sleep in this second receiving station, certainly, also can be through that formulae discovery obtains.

If the 3rd or its receiving station that arbitrary site information is corresponding afterwards that the executive agent of the method shown in Fig. 4 records for NDPA broadcast packet, then as shown in Figure 5, also comprise before going to sleep, S205, according to the length of beam forming report queries, code modulated Modulation and Coding Scheme (ModulationandCodingScheme is carried out to this beam forming report queries, can MCS be abbreviated as) and the serial number of site information in NDPA broadcast packet corresponding to described receiving station, calculate the predetermined length of one's sleep.It should be noted that, perform the order of step S205, need not according to the order shown in Fig. 5.In embodiments of the present invention, just emphasize that step S205 performed before step S203.Such as, receiving station can perform S205 by the SIFS between step S201 and step S202; Also S205 can be performed by the SIFS between step S202 and step S203; Certainly the situation that S202 and S205 carries out simultaneously is not got rid of in embodiments of the present invention yet.

Wherein, according to prior art, the frame structure of beam forming report queries is known, therefore its length is also known.In addition, described Modulation and Coding Scheme can be that the executive agent (the 3rd or after it receiving station corresponding to arbitrary site information) of method shown in Fig. 5 is estimated according to channel conditions and obtained, and Modulation and Coding Scheme comprises: code rate and modulation rate.

Wherein, as shown in Figure 6, step S205 can comprise:

S2051, determine to encode according to the coded system in the length of beam forming report queries and Modulation and Coding Scheme after the length of beam forming report queries;

Exemplary, determine the length L_codeData of beam forming report queries after encoding according to code rate Cr (the MCS code rate of most high-order) in the length L_data of beam forming report queries and modulation coding mode:

L_codeData=L_data/Cr+tailbit

Wherein, code rate Cr can be the actual value estimated, or to estimate the value obtained more bigger than actual; Tailbit is that BCC encodes the tail bit that delay register is made zero.

S2052, determine the length of modulating rear beam forming report queries according to the modulation system in the length of beam forming report queries after coding and Modulation and Coding Scheme;

Wherein modulation system generally comprises: two-phase PSK (Binaryphaseshiftkeying, can BPSK be abbreviated as), quadriphase PSK (Quadraturephaseshiftkeying, can QPSK be abbreviated as), quadrature amplitude modulation (QuadratureAmplitudeModulation, can be abbreviated as QAM, QAM is divided into 64QAM, 256QAM) and modulation rate corresponding to various modulation system be respectively: BPSK is 1bit/symbol; QPSK is 2bit/symbol; 16QAM is 4bit/symbol; 64QAM is 6bit/symbol; 256QAM is 8bit/symbol)

Exemplary, this step can be calculate the data length L_modulatedData=L_codeData/M after modulation according to the length L_codeData of beam forming report queries after above-mentioned coding and modulation rate M.

S2053, determine according to the data subcarrier number of the length of beam forming report queries after modulation and OFDM (Orthogonalfrequencydivisionmultiplexing is called for short OFDM) symbol the OFDM symbol number modulating rear beam forming report queries;

Exemplary, according to the data length L_modulatedData after above-mentioned modulation and OFDM symbol data subcarrier number N_data compute sign number N_sym=L_modulatedData/N_data.

S2054, calculated the shortest time sent after described modulation needed for beam forming report queries by the frame structure of the OFDM symbol number and physical layer packet header of modulating rear beam forming report queries;

Concrete, as shown in Figure 7, the shortest time minT after the described modulation of calculating transmission needed for beam forming report queries brp=8+8+4+8+4+4+4+4 × N_sym=44+4 × N_sym (us), wherein sending time required for 1 OFDM symbol is 4us, and modulation rate selects the MCS of most high-order.

S2055, according to formula S T i=T sIFS+ (i-2) * (2*T sIFS+ minT brp), obtain the predetermined length of one's sleep.

It should be noted that, formula S T i=T sIFS+ (i-2) * (2*T sIFS+ minT brp) can draw according to Fig. 1; Wherein, ST ithe predetermined length of one's sleep of the receiving station that i-th site information that expression NDPA broadcast packet records is corresponding, wherein i>=3; T sIFSrepresent the duration of a SIFS; MinT brprepresent the shortest time needed for beam forming report queries after the described modulation of described transmission.

The method of the channel detection that the embodiment of the present invention provides, makes receiving station except the first need not this feedback request of wait-receiving mode always, but enters sleep until arrive and just wake oneself the predetermined length of one's sleep up to receive feedback request; So, can when not affecting reception feedback request, the stand-by period of minimizing receiving station as much as possible, and then reach the object of power saving.

To sum up can state, the present invention is the channel detection completed on the basis of Fig. 1, the embodiment of the present invention specifically comprises: in the MU-MIMO scene of the ad-hoc network formed at network or the non-basic service collection BSS of BSS composition, transmitting station (beamformer) first sends a NDPA broadcast packet to all relevant receiving stations (beamformee); Receiving station is carried out detection and is prepared after receiving NDPA broadcast packet; Transmitting station continues to send NDP broadcast packet; Receiving station, after receiving NDP broadcast packet, completes the calculating of each autocorrelative channel feedback information; First receiving station (beamformee1 subsequently, it corresponds to first STAInfo field of NDPA) immediately to the channel feedback information of transmitting station transmission self, and other receiving stations except first receiving station all enter sleep, certainly, other receiving stations now have obtained self predetermined length of one's sleep; Afterwards, transmitting station puts in order according to site information in NDPA broadcast packet and sends feedback request to other receiving stations described successively from front to back, accordingly, each in other receiving stations described is when himself predetermined length of one's sleep arrives, wake oneself up, to receive feedback request, and send self relevant channel feedback information to transmitting station after receiving feedback request.

Compared with prior art, the method in the embodiment of the present invention, sending feedback request in order by transmitting station just can have provide condition the predetermined length of one's sleep for receiving station; Receiving station can be in sleep state within the predetermined length of one's sleep, oneself is waken up when the predetermined length of one's sleep arrives, the so neither normal work of influential system, makes again the receiving station minimizing stand-by period as much as possible, thus reaches the object of power saving.

The embodiment of the present invention provides a kind of website 40, specifically in the present embodiment because this website is as the beamforming transmission person (beamformer) in high-throughput detection mechanism, therefore this website is called transmitting station.This website 40 is transmitting station, corresponding with the method shown in above-mentioned Fig. 4.As shown in Figure 8, described website 40 comprises:

NDPA broadcast packet transmitting element 401, for sending a NDPA broadcast packet, to notify that all correlation reception websites do detection and prepare;

Under normal circumstances, the network form Basic Service Set, the physical equipment that Beamformer is corresponding is access point (AP, AccessPoint), and the physical equipment that Beamformee is corresponding is website (STA, Station); Concerning the ad-hoc network of non-basic service collection, the physical equipment that Beamformer is corresponding can be the physical equipment that certain STA, Beamformee are corresponding can be other STA.

NDP broadcast packet transmitting element 402, for continuing transmission one sky bag NDP broadcast packet, after receiving NDP broadcast packet, calculates each autocorrelative channel feedback information to make relative station of reception point;

First channel feedback information receiving element 403, for receiving the channel feedback information that receiving station corresponding to first the receiving station information of carrying in NDPA broadcast packet sends;

From the frame format of the NDPA broadcast packet shown in Fig. 2, can see that NDPA broadcast packet carries the individual site information (STAInformation of n (n >=2), STAInfo can be abbreviated as), this illustrates the channel feedback information that this transmitting station needs to receive n receiving station, and this n receiving station and the n entrained by NDPA broadcast packet STAInfo one_to_one corresponding.In all embodiments of the present invention, the receiving station that carry in NDPA broadcast packet i-th (1≤i≤n) individual STAInfo (i.e. STAInfoi) is corresponding is called i-th receiving station; Wherein, i is as the serial number of site information in NDPA broadcast packet.Concrete, each receiving station has one to connect ID (AssociationID, hereinafter abbreviated as AID), and comprises an AID in each STAInfo; If both AID are consistent, then both are corresponding.

In this element, receiving station corresponding to first site information of carrying in NDPA broadcast packet can be called first receiving station; Concrete, first described receiving station refer to that the receiving station that the AID of receiving station is equal with the AID in first STAInfo (i.e. STAInfo1) field in the NDPA broadcast packet received is consistent.First receiving station is after receiving NDP broadcast packet, channel estimating is done and by channel estimation calculation channel feedback information according to the NDP broadcast packet received, until this channel feedback information is sent to transmitting station, transmitting station is made first to receive the channel feedback information of first receiving station.

Second channel feedback information receiving element 404, sends feedback request to other receiving stations successively for putting in order according to site information in NDPA broadcast packet, to receive the channel feedback information that other receiving stations send.

In described NDPA broadcast packet, site information puts in order as the order of a said n site information.Other websites described refer to the receiving station except first receiving station, are specially the 2nd to the n-th receiving station.

It should be noted that, transmitting station sends feedback request, to receive the channel feedback information of these receiving stations to the 2nd to the n-th receiving station successively.In actual applications, transmitting station needs the channel feedback information obtaining receiving station, but, due to the appearance of some abnormal conditions (such as correctly not resolving NDPA frame etc.), also may transmitting station have sent feedback request, but receiving station not transmitting channel feed back to transmitting station.

The website that the embodiment of the present invention provides, in the MU-MIMO scene of ad-hoc network that wherein network that forms at a BSS of transmitting station or non-basic service collection BSS form, after sending a NDPA broadcast packet and NDP broadcast packet, receive the channel feedback information that receiving station corresponding to first site information of carrying in NDPA broadcast packet sends; Put in order according to site information in NDPA broadcast packet and send feedback request to other receiving stations successively from front to back, to receive the channel feedback information that other receiving stations send.Send compared with feedback request to other receiving stations except the first at random with transmitting station of the prior art, receiving station except the first need not this feedback request of wait-receiving mode always, but enters sleep until arrive and just wake oneself the predetermined length of one's sleep up to receive feedback request; So, can when not affecting reception feedback request, the stand-by period of minimizing receiving station as much as possible, and then reach the object of power saving.

The embodiment of the present invention provides another kind of website 50, specifically in the present embodiment because this website is as the beam forming recipient (beamformee) in high-throughput detection mechanism, therefore this website is called receiving station.And it should be noted that, because first receiving station does not enter sleep, and immediately to transmitting station transmitting channel feedback information, in the process of whole channel detection, identical with existing method for first receiving station; Website 50 method shown in Fig. 9 is applicable to other receiving stations except first receiving station.That is, the executive agent of the method website 50 be the 2nd to any one in the n-th receiving station.Described method website 50 as shown in Figure 9, comprising:

NDPA broadcast packet receiving element 501, for receiving the NDPA broadcast packet that transmitting station sends, doing detection and preparing;

NDP broadcast packet receiving element 502, for receiving the NDP broadcast packet that transmitting station sends, and calculates self relevant channel feedback information;

The NDP broadcast packet that this NDP broadcast packet receiving element 502 sends specifically for receiving transmitting station, does channel estimating according to this NDP broadcast packet of reception, and the channel feedback information of being correlated with by channel estimation calculation self.

Wakeup unit 503, for entering sleep until when arriving the predetermined length of one's sleep, wake oneself up, the feedback request sent with wait-receiving mode transmitting station;

So, receiving station except the first can wake oneself up according to the length of one's sleep of presetting, make other receiving stations need not this feedback request of wait-receiving mode always, but enter sleep until arrive and just wake oneself the predetermined length of one's sleep up to receive feedback request, thus, can when not affecting reception feedback request, the stand-by period of minimizing receiving station as much as possible, to reach the object of power saving.

Feedback information transmitting element 504, for after receiving feedback request, to transmitting station transmitting channel feedback information.

It should be noted that, the feedback request described in all embodiments of the present invention is beam forming report queries (BeamformingRepotPoll)

Further, if the receiving station (i.e. second receiving station) that second site information recording for NDPA broadcast packet of the website shown in Fig. 9 is corresponding, then predetermined in wakeup unit 503 length of one's sleep is the duration of a short frame pitch SIFS.

If the 3rd or its receiving station that arbitrary site information is corresponding afterwards that the website shown in Fig. 9 records for NDPA broadcast packet, then as shown in Figure 10, website 50 also comprises computing unit 505 length of one's sleep, for the length according to beam forming report queries, this beam forming report queries carried out to code modulated Modulation and Coding Scheme and the serial number of site information in NDPA broadcast packet corresponding to described receiving station, calculate the predetermined length of one's sleep.

Wherein, according to prior art, the frame structure of beam forming report queries is known, therefore its length is also known.In addition, described Modulation and Coding Scheme can be that Figure 10 website (the 3rd or after it receiving station corresponding to arbitrary site information) is estimated according to channel conditions and obtained, and Modulation and Coding Scheme comprises: code rate and modulation rate.

Wherein, the length of one's sleep, computing unit 505 can comprise:

Length computation module 5051 after coding, for the length of beam forming report queries after determining according to the coded system in the length of beam forming report queries and Modulation and Coding Scheme to encode;

Length computation module 5052 after modulation, for determining the length of modulating rear beam forming report queries according to the modulation system in the length of beam forming report queries after coding and Modulation and Coding Scheme;

OFDM symbol number computing module 5053, for determining according to the length of beam forming report queries and the data subcarrier number of orthogonal frequency division multiplex OFDM symbol after modulation the OFDM symbol number modulating rear beam forming report queries;

Shortest time computing module 5054, for being calculated the shortest time sent needed for the rear beam forming report queries of modulation by the frame structure of the OFDM symbol number and physical layer packet header of modulating rear beam forming report queries;

The length of one's sleep computing module 5055, for according to formula S T i=T sIFS+ (i-2) * (2*T sIFS+ minT brp), obtain the predetermined length of one's sleep; Wherein, ST ithe predetermined length of one's sleep of the receiving station that i-th site information that expression NDPA broadcast packet records is corresponding, wherein i>=3; T sIFSrepresent the duration of a SIFS; MinT brprepresent the shortest time needed for beam forming report queries after the described modulation of described transmission.

The receiving station that the embodiment of the present invention provides, makes receiving station except the first need not this feedback request of wait-receiving mode always, but enters sleep until arrive and just wake oneself the predetermined length of one's sleep up to receive feedback request; So, can when not affecting reception feedback request, the stand-by period of minimizing receiving station as much as possible, and then reach the object of power saving.

The wireless communication system that the embodiment of the present invention provides, comprising: transmitting station and at least two receiving stations: transmitting station is above-mentioned website 40; Receiving station at least two receiving stations except first receiving station is above-mentioned website 50.

The wireless communication system that the embodiment of the present invention provides, transmitting station sends NDPA broadcast packet and NDP broadcast packet to receiving station, and transmitting station puts in order according to site information in NDPA broadcast packet and sends feedback request to other websites except first website successively from front to back; After receiving station receives NDP broadcast packet, information according to NDP broadcast packet record calculates channel feedback information, first receiving station has calculated rear transmitting channel feedback information, and after other receiving stations have calculated feedback information, need the length of one's sleep calculating oneself according to NDPA broadcast packet, to enter sleep state, until arrive the length of one's sleep of subscribing just wake oneself up.So, the receiving station minimizing stand-by period as much as possible can be made, thus reach the object of power saving.

One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims (13)

1. a method for channel detection, is characterized in that, comprising:
Send an empty bag notice NDPA broadcast packet, to notify that correlation reception website does detection and prepares; Wherein, carry the site information of at least two receiving stations in described NDPA broadcast packet, described site information comprises the serial number of receiving station;
Continue transmission one sky bag NDP broadcast packet, after receiving NDP broadcast packet to make described relative station of reception point, calculate each autocorrelative channel feedback information;
Receive the channel feedback information that receiving station corresponding to first site information of carrying in described NDPA broadcast packet sends; Wherein, other receiving stations except the receiving station that described first site information is corresponding are in sleep state, until reach the predetermined length of one's sleep to wake oneself up, to receive the feedback request that transmitting station sends;
Put in order according to site information in described NDPA broadcast packet and send feedback request to other receiving stations successively from front to back, to receive the channel feedback information that other receiving stations described send.
2. a method for channel detection, is characterized in that, comprising:
Receive the sky bag notice NDPA broadcast packet that transmitting station sends, do detection and prepare; Wherein, carry the site information of at least two receiving stations in described NDPA broadcast packet, described site information comprises the serial number of receiving station;
Receive the sky bag NDP broadcast packet that transmitting station sends, and calculate self relevant channel feedback information;
Enter sleep until when arriving the predetermined length of one's sleep, wake oneself up, to receive the feedback request that transmitting station sends;
After receiving described feedback request, send described channel feedback information to described transmitting station.
3. method according to claim 2, is characterized in that, described feedback request is beam forming report queries.
4. method according to claim 3, is characterized in that, if the receiving station that second site information recording for NDPA broadcast packet of receiving station is corresponding, then the described predetermined length of one's sleep is the duration of a short frame pitch SIFS.
5. method according to claim 3, is characterized in that, if the 3rd or its receiving station that arbitrary site information is corresponding afterwards that receiving station records for NDPA broadcast packet, then also comprises before going to sleep:
According to the length of described beam forming report queries, this beam forming report queries carried out to code modulated Modulation and Coding Scheme and the serial number of site information in NDPA broadcast packet corresponding to described receiving station, calculate the described predetermined length of one's sleep.
6. method according to claim 5, is characterized in that, according to the length of described beam forming report queries with carry out code modulated Modulation and Coding Scheme to this beam forming report queries, calculates and comprises the described predetermined length of one's sleep:
The length of beam forming report queries after determining to encode according to the coded system in the length of described beam forming report queries and described Modulation and Coding Scheme;
The length of modulating rear beam forming report queries is determined according to the modulation system in the length of beam forming report queries after described coding and described Modulation and Coding Scheme;
The OFDM symbol number of beam forming report queries after described modulation is determined according to the length of beam forming report queries after described modulation and the data subcarrier number of orthogonal frequency division multiplex OFDM symbol;
The shortest time sent after described modulation needed for beam forming report queries is calculated by the OFDM symbol number of beam forming report queries after described modulation and the frame structure of physical layer packet header;
According to formula S T i=T sIFS+ (i-2) * (2*T sIFS+ minT brp), obtain the predetermined length of one's sleep; Wherein, ST ithe predetermined length of one's sleep of the receiving station that i-th site information that expression NDPA broadcast packet records is corresponding, wherein i>=3; T sIFSrepresent the duration of a SIFS; MinT brprepresent the shortest time needed for beam forming report queries after the described modulation of described transmission.
7. a website, is characterized in that, comprising:
NDPA broadcast packet transmitting element, for sending an empty bag notice NDPA broadcast packet, to notify that correlation reception website does detection and prepares; Wherein, carry the site information of at least two receiving stations in described NDPA broadcast packet, described site information comprises the serial number of receiving station;
NDP broadcast packet transmitting element, for continuing transmission one sky bag NDP broadcast packet, after receiving NDP broadcast packet, calculates each autocorrelative channel feedback information to make described relative station of reception point;
First channel feedback information receiving element, for receiving the channel feedback information that receiving station corresponding to first site information of carrying in described NDPA broadcast packet sends; Wherein, other receiving stations except the receiving station that described first site information is corresponding are in sleep state, until reach the predetermined length of one's sleep to wake oneself up, to receive the feedback request that transmitting station sends;
Second channel feedback information receiving element, sends feedback request to other receiving stations from front to back successively for putting in order according to site information in described NDPA broadcast packet, to receive the channel feedback information that other receiving stations described send.
8. a website, is characterized in that, comprising:
Empty bag notice NDPA broadcast packet receiving element, for receiving the NDPA broadcast packet that transmitting station sends, doing detection and preparing; Wherein, carry the site information of at least two receiving stations in described NDPA broadcast packet, described site information comprises the serial number of receiving station;
Empty bag NDP broadcast packet receiving element, for receiving the NDP broadcast packet that transmitting station sends, and calculates self relevant channel feedback information;
Wakeup unit, for entering sleep until when arriving the predetermined length of one's sleep, wake oneself up, to receive the feedback request that transmitting station sends;
Feedback information transmitting element, for after receiving described feedback request, sends described channel feedback information to described transmitting station.
9. website according to claim 8, is characterized in that, described feedback request is beam forming report queries.
10. website according to claim 9, is characterized in that, if described website is corresponding with second site information that NDPA broadcast packet records, then the described predetermined length of one's sleep is the duration of a short frame pitch SIFS.
11. websites according to claim 9, is characterized in that, if described website and NDPA broadcast packet the 3rd of recording or after it arbitrary site information corresponding, then described website also comprises:
The length of one's sleep computing unit, for the length according to described beam forming report queries, this beam forming report queries carried out to code modulated Modulation and Coding Scheme and the serial number of site information in NDPA broadcast packet corresponding to described receiving station, calculate the described predetermined length of one's sleep.
12. websites according to claim 11, is characterized in that, described length of one's sleep, computing unit comprised:
Length computation module after coding, for the length of beam forming report queries after determining according to the coded system in the length of described beam forming report queries and described Modulation and Coding Scheme to encode;
Length computation module after modulation, for determining the length of modulating rear beam forming report queries according to the modulation system in the length of beam forming report queries after described coding and described Modulation and Coding Scheme;
OFDM symbol number computing module, for determining the OFDM symbol number of beam forming report queries after described modulation according to the length of beam forming report queries after described modulation and the data subcarrier number of orthogonal frequency division multiplex OFDM symbol;
Shortest time computing module, for being calculated the shortest time sent after described modulation needed for beam forming report queries by the OFDM symbol number of beam forming report queries after described modulation and the frame structure of physical layer packet header;
The length of one's sleep computing module, for according to formula S T i=T sIFS+ (i-2) * (2*T sIFS+ minT brp), obtain the predetermined length of one's sleep; Wherein, ST ithe predetermined length of one's sleep of the receiving station that i-th site information that expression NDPA broadcast packet records is corresponding, wherein i>=3; T sIFSrepresent the duration of a SIFS; MinT brpshortest time after the described modulation of expression transmission needed for beam forming report queries.
13. 1 kinds of wireless communication systems, is characterized in that, comprising: transmitting station and at least two receiving stations;
Described transmitting station is website according to claim 7;
Receiving station in described at least two receiving stations except first receiving station is the website described in any one of claim 8 ~ 12.
CN201110276263.1A 2011-09-16 2011-09-16 A kind of method of channel detection, Apparatus and system CN103002471B (en)

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