CN103001680B - Method and device for transmitting weight - Google Patents
Method and device for transmitting weight Download PDFInfo
- Publication number
- CN103001680B CN103001680B CN201110271773.XA CN201110271773A CN103001680B CN 103001680 B CN103001680 B CN 103001680B CN 201110271773 A CN201110271773 A CN 201110271773A CN 103001680 B CN103001680 B CN 103001680B
- Authority
- CN
- China
- Prior art keywords
- weights
- beam forming
- effective duration
- vht
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000012360 testing method Methods 0.000 claims abstract description 85
- 230000005540 biological transmission Effects 0.000 claims description 52
- 238000007493 shaping process Methods 0.000 claims description 34
- YLKFDHTUAUWZPQ-UHFFFAOYSA-N N-Nitrosodi-n-propylamine Chemical compound CCCN(N=O)CCC YLKFDHTUAUWZPQ-UHFFFAOYSA-N 0.000 claims description 27
- 230000004044 response Effects 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 13
- 238000011524 similarity measure Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101150081243 STA1 gene Proteins 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity 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
- H04B7/0615—Diversity 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
- H04B7/0617—Diversity 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 for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity 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
- H04B7/0615—Diversity 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
- H04B7/0619—Diversity 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
- H04B7/0621—Feedback content
- H04B7/0634—Antenna weights or vector/matrix coefficients
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
An embodiment of the invention provides a method and a device for transmitting a weight. The method includes receiving a channel test signal transmitted by a beamformer; testing a channel to obtain the corresponding weight; determining a valid duration corresponding to the weight; storing the weight in a very high throughput (VHT) compressed beamforming report element; and transmitting a VHT compressed beamforming frame comprising the VHT compressed beamforming report element to the beamformer within the valid duration of the weight. The method and the device have the advantages that the corresponding weight is obtained after the channel of the beamformer is tested, the duration corresponding to the weight is set, the weight is further fed to the beamformer after the validity of the duration of the weight is judged, the problem of outdated information of a weight acquired by an existing beamformer is solved, and the quality of follow-up communication is improved.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of transmission method of weights and device.
Background technology
Along with the development of the communication technology, in WLAN (wireless local area network), in order to improve communication quality, there is Channel Detection (Sounding) mechanism between a kind of beam forming promoter (Beamformer) website and beam forming recipient (Beamformee) website.Described Sounding mechanism specifically comprises:
First, Beamformer website sends empty packet to single or multiple Beamformee website and notices (NDPA, Null Data Packet Announcement) frame, notify with carry in this announcement frame associate address (AID, Assocation identifier, being also called associated flag symbol) the Beamformee website that matches prepares to carry out channel detection, and indicate the content of its feedback weight, then, described Beamformer sends the empty packet (NDP not comprising data, Null Data Packet) frame, for Beamformee provides the test parameter of channel.Test after described Beamformee website receives NDP frame, the result according to test calculates weights, and is saved in by the weights of calculating very in high-throughput (VHT, Very HighThroughput) compressional wave beam forming form.After the SIFS period after described NDP sends, the first Beamformee carrying out Channel Detection that this single Beamformee or empty packet are noticed in NDPA frame sends the VHTCompressed Beamforming frame comprising VHT compressional wave beam forming form element to Beamformer, afterwards, described Beamformer sends beam forming response request frame (Beamforming ReportPoll) frame to other BeamformeeBeamformee in this NDPA frame successively, but, because other Beamformee in this NDPA frame does not receive NDPA frame or NDP frame, channel test cannot be done, thus up-to-date calculating weights cannot be obtained, if this Beamformee has compressional wave beam forming form (weights in this form are not up-to-date), then normal transmission comprises the VHT Compressed Beamforming frame of this VHT compressional wave beam forming form element, if Beaformee does not have compressional wave beam forming form, or there is no weights in form, then send a VHT Compressed Beamforming frame not containing compressional wave beam forming form element.
To in the research and practice process of prior art, the present inventor finds, in existing implementation, to the compressional wave beam forming form that Berformee preserves, may lose efficacy due to multiple, if do not add identification just send the compressional wave beam forming form preserved, then the feedback weight that Beamformer may be caused to collect is expired, thus affects follow-up communication quality.
Summary of the invention
The embodiment of the present invention provides a kind of transmission method and device of weights, to solve the expired technical problem of the weights that receive in prior art, to improve communication quality.
For solving the problems of the technologies described above, the embodiment of the present invention provides a kind of transmission method of weights, and described method comprises:
The channel test signal that the shaping sender of received beam sends;
Channel is tested and obtains corresponding weights;
Determine effective duration that described weights are corresponding;
Described weights are kept at very in high-throughput VHT compressional wave beam forming form element;
In effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender.
Accordingly, the embodiment of the present invention also provides a kind of transmitting device of weights, and described device comprises:
First receiving element, for the channel test signal that the shaping sender of received beam sends;
Test cell, obtains corresponding weights for testing channel;
Determining unit, for determining effective duration that described weights are corresponding;
Memory cell, for being kept at very in high-throughput VHT compressional wave beam forming form element by described weights;
First transmission unit, in effective duration of described weights, sends described VHT compressional wave beam forming form element to described beam forming sender.
Accompanying drawing explanation
The flow chart of the transmission method of a kind of weights that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the transmission method of the another kind of weights that Fig. 2 provides for the embodiment of the present invention;
The frame structure schematic diagram of a kind of NDPA frame that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the transmitting device of a kind of weights that Fig. 4 provides for the embodiment of the present invention.
Embodiment
In order to the scheme making those skilled in the art person understand the embodiment of the present invention better, below in conjunction with drawings and embodiments, the embodiment of the present invention is described in further detail.
Refer to Fig. 1, the flow chart of the transmission method of a kind of weights provided for the embodiment of the present invention; Described method comprises step;
Step 101: the channel test signal that the shaping sender of received beam (Beamformer) sends;
In this step, can be the channel test signal that all beam forming recipients (Beamformee), single beam forming recipient or website (STA, Station) receive beam forming sender transmission.Wherein, channel test signal can be sky packet (NDP, Null Data Packet) frame, its objective is as beam forming recipient provides channel test parameter.But be not limited to this, can also have the empty frame that other do not comprise data, the present embodiment is not restricted.
Step 102: channel is tested and obtains corresponding weights;
Wherein, to the test that channel carries out, such as, the mode of channel estimating is adopted to test channel.That is, beam forming recipient, after receiving channel test signal, adopts the channel of mode to self of channel estimating to test, obtains weights according to test result.
Step 103: determine effective duration that described weights are corresponding;
In this embodiment, determine that effective duration that weights are corresponding illustrates with following five kinds of embodiments:
The first is: 1) determine self translational speed of beam forming recipient;
2) carry out stepping according to the size of described translational speed, obtain the class of friction speed; Such as be divided into high, medium and low third gear, but be not limited to this.
3) be effective duration that each grade of Speed Setting is corresponding, described effective duration can be controlled by counter, also can be realized by other similar counter blocks; Class is higher, and effective duration of setting is shorter.
4) while being kept at by described weights very in high-throughput (VHT, Very High Throughput) compressional wave beam forming form element, counter counts down is started.
In this step, the counting of counter is to be decremented to example, and certainly, can arrange the counting of counter to increase progressively, the present embodiment is not restricted.Such as, the corresponding effective duration of each speed class, effective duration unit can be us, and such as the duration of basic, normal, high fast shelves is set to T1, T2, T3.T1 > T2 > T3, starts described counter, described counter counts down while weights being kept at VHT compressional wave beam forming form element.
The second is: 1) calculate Doppler frequency shift according to the rate travel of beam forming recipient;
2) according to effective duration of described Doppler frequency shift and channel Similarity Measure weights.
The third is: before the channel test signal notice that the shaping promoter of received beam sends, if receive the media access control (MAC) frame that the shaping promoter of received beam sends, described media access control (MAC) frame comprises first effective duration information of instruction weight setting; Then when determining effective duration corresponding to described weights, can determine according to indicating in described media access control (MAC) frame first of weight setting effective duration information effective duration that described weights are corresponding.
4th kind is: before the channel test signal notice that the shaping promoter of received beam sends, if receive the beacon frame of beam forming promoter transmission, described beacon frame comprises second effective duration information of instruction weight setting; Second effective duration information can be identical with described first effective duration information, also can be different; Then when determining effective duration corresponding to described weights, can determine according to indicating in described beacon frame second of weight setting effective duration information effective duration that described weights are corresponding.
5th kind, when described channel test signal notices the 3rd effective duration information comprising instruction weight setting, wherein, the described 3rd effective duration information can be identical with described first effective duration or second effective duration, also can be different,
The described effective duration determining that described weights are corresponding is specially: determine according to the 3rd effective duration information of described instruction weight setting effective duration that described weights are corresponding.
But specifically determine that effective duration that weights are corresponding is not limited to above-mentioned five kinds of modes, can be other mode, the present embodiment be restricted.
Step 104: described weights are kept at very in high-throughput VHT compressional wave beam forming form element;
Step 105: in effective duration of described weights the effective time of weights (i.e. in), send described VHT compressional wave beam forming form element to described beam forming sender.Such as, by VHT compressional wave beam forming frame, described VHT compressional wave beam forming form element can be sent to beam forming sender, but be not limited to this, can also be sent by other frame.
Wherein, in this embodiment, described weights will be fed back to beam forming promoter by described beam forming person, described beam forming promoter will be weighted, to improve the reception condition of beam forming recipient to signal transmission.
Preferably, in this embodiment, before send described VHT compressional wave beam forming form element to described beam forming sender, described method can also comprise: the beam forming response request frame that the shaping sender of received beam sends; Afterwards, in effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender, specifically can send described VHT compressional wave beam forming form element by VHT compressional wave beam forming frame to described beam forming sender.
Preferably, described method can also comprise: judge whether self is the first beam forming recipient specified during described channel test signal is noticed, if, perform in effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender; Otherwise, perform the beam forming response request frame that the shaping sender of described received beam sends; In effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender.
That is, in this step, if beam forming recipient determines the first beam forming recipient specified in noticing as described channel test signal, then within the effective time of described weights, send the VHT compressional wave beam forming frame comprising described VHT compressional wave beam forming form element to described beam forming sender; Or
If beam forming recipient determines the non-first beam forming recipient specified in noticing as described channel test signal, then after the beam forming response request frame receiving beam forming sender transmission, in the effective situation of described weights, send the VHT compressional wave beam forming frame comprising described VHT compressional wave beam forming form element to described beam forming sender.
In the embodiment of the present invention, beam forming recipient is after testing channel, obtain corresponding weights, and for setting effective duration of corresponding weights, and after judging that described weights effectively, then feed back this weights to beam forming sender, solve the expired phenomenon of described value information that beam forming sender collects, save the cost of possession to channel resource, improve the quality of subsequent communications.
Also refer to Fig. 2, the flow chart of the transmission method of the another kind of weights provided for the embodiment of the present invention, described method comprises:
Step 201: the channel test signal that the shaping promoter of received beam sends is noticed;
In this step, it can be that sky packet notices (NDPA, Null DataPacket Announcement) frame that channel test signal is noticed, but is not limited to this.The schematic diagram of the frame structure of described NDPA frame as shown in Figure 3, in figure 3, described NDPA frame comprises following field: frame control, duration, receiving terminal address (RA, Receiver address), transmitting terminal address (TA, Transmitter address), detection sequence (Sounding), site STA Info1 to STA InfoN and Frame Check Sequence (FCS, FrameCheck Sequence) etc., wherein, described detection sequence comprises again: reserved field and sequence number; Described site STA 1 Info1 comprises: associated flag symbol (AID, Assocation identifier, namely associates address), feedback kind and NC Index, specifically as shown in Figure 3.In like manner, in described STA InfoN, each website all can comprise AID, feedback kind and NC Index, not shown in the figures.
In Fig. 3, if if described receiving terminal address RA unicast address, indicate Beamformer to carry out channel detection to single Beamformee, now n=1 in STA Info n;
If if described receiving terminal address RA multicast address, indicate Beamformer to carry out channel detection to multiple Beamformee, now n > 1 in STAInfo n;
Beam forming recipient can also determine it self is first beam forming recipient according to this receiving terminal address, also the first beam forming recipient of right and wrong.
Described Sounding sequence is used to indicate the order of this NDPA frame, is used to indicate the NDPA frame batch number corresponding to VHT compressional wave beam forming form of Beamformee feedback;
Described STA info is used to indicate those STA (AID is the numbering of corresponding STA) and prepares to intercept NDP frame and carry out channel detection;
Described AID field references Beamformer is the association address AID that Beamformee distributes.
Described Feedback the type field represents feedback kind, is mainly used to distinguish SU-MIMO (Feedback Type=0) scene and MU-MIMO (Feedback Type=1) scene.
Described NC Index field is set to 0 under SU-MIMO scene, is then set to feed back dimension accordingly under MU-MIMO scene.
Step 202: notice according to described channel test signal and determine whether self is beam forming recipient to be measured, if so, performs step 203; Otherwise, perform step 208, terminate this flow process;
In this step, if the address AID that associates that the shaping recipient of received beam and described channel test signal are noticed matches, then illustrate that the shaping recipient of described received beam is beam forming recipient to be measured, afterwards, beam forming recipient to be measured enters test mode, waits for the channel test signal (such as NDP frame etc.) that beam forming sender sends.
Step 203: the channel test signal that the shaping sender of received beam sends;
This channel test signal can be NDP frame, but is not limited to this.
Step 204: channel is tested and obtains corresponding weights;
Step 205: determine effective duration that described weights are corresponding;
Described in its concrete determination, the detailed process of effective duration that weights are corresponding refers to the description of above-mentioned correspondence.
Step 206: described weights are kept in VHT compressional wave beam forming form element;
Step 207: in effective duration of described weights, sends the VHT compressional wave beam forming frame comprising described VHT compressional wave beam forming form element to described beam forming sender.
In this step, by VHT compressional wave beam forming frame, described VHT compressional wave beam forming form element can be sent to beam forming sender, but be not limited to this.
In this embodiment, step 203 specifically refers to above-mentioned to step 207.
On the basis of above-described embodiment, within the effective time of described weights, before comprising the VHT compressional wave beam forming frame of described VHT compressional wave beam forming form element to described beam forming sender transmission, described method can further include:
Judge that whether weights are effective, if weights are effective, then perform within the effective time of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender; Otherwise, within the effective time of described weights, described VHT compressional wave beam forming form element is not sent to described beam forming sender, such as, the described VHT compressional wave beam forming frame not comprising described VHT compressional wave beam forming form element to beam forming sender transmission.
Further, described method can also comprise: after judging that described weights are invalid, empties the described weights in compressional wave beam forming form element.
Wherein, describedly judge weights whether effective process, the present embodiment illustrates for two kinds of situations, but is not limited to this:
One is, judges whether the counting of counter makes zero, if the counting of counter does not make zero, then judges that described effective duration is effective; Otherwise, judge that described effective duration is invalid;
Another kind is: if the moment of effective duration of setup algorithm weights to the feedback weight moment time T after, effective duration of more described weights and the time T of setting, if described time T is less than or equal to effective duration of weights, then judge that effective duration of described weights is effective; Otherwise, judge that effective duration of described weights is invalid.
Again in another kind of embodiment, beam forming recipient receives the media access control MAC frame that beam forming promoter sends, and described media access control MAC frame comprises first effective duration information of instruction weight setting; Specifically can pass through the media access control (MAC) frame that the shaping promoter of clean culture, broadcast or multicast mode received beam sends; Wherein, any field in described mac frame all can comprise first effective duration information of instruction weight setting, such as, and existing field, reserved field or extended field etc. in described mac frame.
Afterwards, beam forming recipient, after the channel test signal receiving beam forming sender transmission, tests channel and obtains corresponding weights;
Afterwards, beam forming recipient determines according to indicating first of weight setting effective duration information in described media access control (MAC) frame effective duration that described weights are corresponding.
Described weights are kept in VHT compressional wave beam forming form element, and in effective duration of described weights, send the VHT compressional wave beam forming frame comprising described VHT compressional wave beam forming form element to described beam forming sender.
Preferably, in this example, described mac frame can comprise: broadcast MAC frame, multicast MAC frames or clean culture mac frame.Wherein, described broadcast MAC frame can be beacon frame, and described multicast MAC frames can be NDPA frame; Described clean culture mac frame can be association request frame or association response frame.But be not limited to this.
In another kind of embodiment, beam forming recipient receives the channel test signal notice that beam forming promoter sends; Notice to confirm self whether to be beam forming recipient to be measured according to described channel test signal, and when confirming self to be beam forming recipient to be measured, enter channel test state; And
After the channel test signal receiving beam forming sender transmission; Channel is tested and obtains corresponding weights, wherein, described channel test signal notices the second effective duration information comprising instruction weight setting, described second effective duration information and described first effective duration identical or different, the receiving terminal address RA field specifically can noticed at channel test signal comprises second effective duration information of instruction weight setting, but is not limited to this.
Beam forming recipient determines according to second effective duration information of described instruction weight setting effective duration that described weights are corresponding, described weights are kept in VHT compressional wave beam forming form element, and in effective duration of described weights, send the VHT compressional wave beam forming frame comprising described VHT compressional wave beam forming form element to described beam forming sender.
Preferably, in this embodiment, the channel test signal that beam forming recipient receives beam forming promoter transmission by multicast mode is noticed.
In the embodiment of the present invention, by set effective duration counter and effective time comparison mechanism judge preserve the validity of feedback weight, determine again afterwards the content (namely whether comprising the VHT compressional wave beam forming form element storing weights) that the VHT CompressedBeamforming frame that it sends comprises can prevent the information expires phenomenon that Beamformer collects.
Based on the implementation procedure of said method, the embodiment of the present invention also provides a kind of transmitting device of weights, and its structural representation as shown in Figure 4, described device comprises: the first receiving element 41, test cell 42, determining unit 43, memory cell 44 and the first transmission unit 45, wherein
Described first receiving element 41, for the channel test signal that the shaping sender of received beam sends; Wherein, channel test signal can be NDP frame, its objective is as recipient provides channel test parameter.But be not limited to this, can also have the empty frame that other do not comprise data, the present embodiment is not restricted.
Described test cell 42, obtains corresponding weights for testing channel;
Wherein, to the test that channel carries out, such as, the mode of channel estimating is adopted to test channel.That is, beam forming recipient, after receiving channel test signal, adopts the channel of mode to self of channel estimating to test, obtains weights according to test result.
Described determining unit 43, for determining effective duration that described weights are corresponding; One is: 1) determine self translational speed of beam forming recipient; 2) carry out stepping according to the size of described translational speed, obtain the speed of different shelves; Such as be divided into high, normal, basic third gear, but do not show in this.3) be the duration that each grade of Speed Setting is corresponding, described duration is controlled by counter; That is, shelves speed is higher, and the duration of setting is shorter.4) while being kept at by described weights in compressional wave beam forming form, counter counts down is started.Another kind is: 1) calculate Doppler frequency shift according to the rate travel of beam forming recipient; 2) according to the duration of described Doppler frequency shift and channel Similarity Measure weights.But specifically determining that the duration that weights are corresponding is not limited to above-mentioned two kinds of modes, can be other mode, determine in mode other three kinds etc. for such as above-mentioned five kinds.
Described memory cell 44, for being kept at very in high-throughput VHT compressional wave beam forming form element by described weights;
Described first transmission unit 45, for in effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender, specifically can send described VHT compressional wave beam forming form element by VHT compressional wave beam forming frame to described beam forming sender.
Preferably, described device can further include: the second receiving element and the first judging unit, wherein, and described second receiving element, for before described first receiving element receives described channel test signal, the channel test signal that the shaping promoter of received beam sends is noticed; First judging unit, confirm self whether to be beam forming recipient to be measured for noticing according to described channel test signal, and when confirming self to be beam forming recipient to be measured, start the channel test signal that the shaping sender of described first receiving element received beam sends.
Preferably, described device can also comprise: the 3rd receiving element, is connected with described first transmission unit, for receiving the beam forming response request frame that described beam forming sender sends;
Described second transmission unit, also for receive at the 3rd receiving element described beam forming sender send beam forming response request frame after, in effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender.
Preferably, described device can also comprise: the second judging unit, for judging whether self is the first beam forming recipient specified during described channel test signal is noticed, and the judged result being is sent to the first transmission unit; No judged result is sent to the second transmission unit.
Preferably, described determining unit comprises: speed determining unit, stepping unit, duration setup unit and count enable unit, and wherein, described speed determining unit, for determining self translational speed of beam forming recipient; Described stepping unit, carries out stepping for the size according to described translational speed, obtains the speed of different shelves; Described duration setup unit, for being effective duration corresponding to each grade of Speed Setting, described duration is controlled by counter; Described count enable unit, for when described weights are kept in VHT compressional wave beam forming form element by described memory cell, starts counter counts down.
Preferably, described determining unit comprises: frequency displacement computing unit and duration calculation unit, and wherein, frequency displacement computing unit, calculates Doppler frequency shift for the rate travel according to beam forming recipient; Described duration calculation unit, for the effective duration according to described Doppler frequency shift and channel Similarity Measure weights.
Preferably, described device can also comprise: the 3rd judging unit and the 3rd transmission unit, wherein,
Described 3rd judging unit, for judging that whether weights are effective, if effectively, then sends to described first transmission unit by effective for weights judged result; Judged result invalid for weights is sent to the 3rd transmission unit;
Described 3rd transmission unit, for when described weights invalid, sends the VHT compressional wave beam forming frame not comprising described VHT compressional wave beam forming form element to described beam forming sender.
Preferably, described 3rd judging unit comprises: counting judging unit and/or comparison judgment unit, wherein, described counting judging unit, for judging whether the counting of counter makes zero, if the counting of counter does not make zero, then determine that described weights are effective, effective for weights judged result is sent to described first transmission unit; Otherwise, determine that described weights are invalid, judged result invalid for weights sent to described 3rd transmission unit; Described comparison judgment unit, for comparing effective duration of weights and the time T calculating weights moment to the feedback weight moment; If described time T is not more than effective duration of weights, then determines that described weights are effective, effective for weights judged result is sent to described first transmission unit; Otherwise, determine that described weights are invalid, judged result invalid for weights sent to described second transmission unit.
Preferably, described device can also comprise: delete cells, is connected with the 3rd judging unit, for after judging that described weights are invalid, empties the described weights in described VHT compressional wave beam forming form element.
Preferably, before the channel test signal notice that the shaping promoter of described second receiving element received beam sends, described device can also comprise: the 4th receiving element, for the media access control MAC frame that the shaping promoter of received beam sends, described media access control MAC frame comprises first effective duration information of instruction weight setting; Specifically can pass through the media access control MAC frame that the shaping promoter of clean culture, broadcast or multicast mode received beam sends.
Described determining unit specifically for: indicate second of weight setting effective duration information to determine effective duration that described weights are corresponding according to indicating in described media access control MAC frame in first of weight setting effective duration information or beacon frame.
Wherein, the described mac frame that described 4th receiving element receives comprises: broadcast MAC frame, multicast MAC frames and clean culture mac frame, and wherein, described broadcast MAC frame can be beacon frame, and described multicast MAC frames can be NDPA frame; Described clean culture mac frame can be association request frame or association response frame.But be not limited to this.
Preferably, when the receiving terminal address RA field that the described channel test signal that described second receiving element receives is noticed comprises second effective duration information of instruction weight setting, described second effective duration information can be identical with described first effective duration, also can be different
Described determining unit specifically for: determine according to second effective duration information of described instruction weight setting effective duration that described weights are corresponding.
In described device, the function of unit and most implementation procedure, refer to implementation procedure corresponding in said method.
For the ease of the understanding of those skilled in the art, illustrate with concrete example below.
Embodiment one
In this embodiment, mainly judge effective situation of the compressional wave beam forming form that Beamformee preserves, its process comprises:
1), site STA receives the NDPA frame that Beamformer sends, if with associate address AID in NDPA frame and match, then know and oneself become Beamformee to be measured, and enter test mode and wait for that Beamfomer sends NDP frame.
2) after, Beamformee receives test signal NDP frame, calculate channel estimation value, and according to channel estimation value compute beam shaping (beamforming) weights coefficient, and this weights systematic conservation is saved in VHT compressional wave beam forming form element to compression, simultaneously, according to self translational speed (channel estimating degree of testing the speed can be utilized or use GPS degree of testing the speed etc.), stepping (such as can be divided into basic, normal, high fast shelves etc., but be not limited to this) is carried out to translational speed.According to the duration of stepping setting counter, (the corresponding duration of every grade of speed, duration unit can be us, and such as the duration of basic, normal, high fast shelves is set to T1, T2, T3 respectively.And T1 > T2 > T3), while preservation VHT compressional wave beam forming form element, start described counter, described counter is for countdown;
In this step, if Beamformee determines from as the first Beamformee in described NDPA frame, then, after calculating beamforming weights coefficient (i.e. weights), to be kept at by weights coefficient in VHT compressional wave beam forming form element; Afterwards, feedback weight is carried out according to following two kinds of situations: a kind of situation is: directly described weights coefficient can be sent to Beamforer by VHT Compressed Beamforming frame; Another kind of situation is, first judge effective duration of weights coefficient whether effectively shown in (its a kind of process judged is as step 3), but be not limited to this), if effective, then by VHTCompressed Beamforming frame, the VHT compressional wave beam forming form element comprising weights coefficient is sent to Beamforer by VHT compressional wave beam forming frame.
If Beamformee determines from as the non-first Beamformee (other Beamformee namely except first Beamformee) in described NDPA frame, then to perform step 3);
3), other Beamformee are respectively at beam forming response request (the Beamforming Report Poll) frame receiving Beamforer transmission, require feedback weight, other Beamformee first judge that whether the compressional wave beam forming (i.e. weights) of be kept at VHT compressional wave beam forming form element is effective respectively; And then determine that institute sends the content of VHT Compressed Beamforming frame, if effectively, then transmission comprises the VHT compressional wave beam forming frame of the VHT compressional wave beam forming form element of weights; Otherwise, send the VHT compressional wave beam forming frame not comprising the VHT compressional wave beam forming form element of weights.
Wherein, judge that the effective procedure of effective duration is:
If judge that the counting of counter does not make zero, then judge that now weights are effective, and by these weights with VHTCompressed Beamforming frame for carrier sends to Beamformer.
If, counter be counted as zero, then judge that now weights are invalid, then transmission one do not comprised the VHT compressional wave beam forming frame of VHT compressional wave beam forming form element.
In this embodiment, can also comprise: if judge that described weights are invalid, the weights in compressional wave beam forming form element can also be emptied.
Embodiment two
The present embodiment two is with the difference of embodiment one, at calculating channel estimation value, corresponding weights are obtained according to estimated value, and while weights being saved in VHT compressional wave beam forming form element, effective duration of these weights of budget, specifically comprises: calculate Doppler frequency shift according to the rate travel of beam forming recipient; According to effective duration of described Doppler frequency shift and channel Similarity Measure weights.Other processes of this example two and embodiment together, specifically refer to the description of above-mentioned correspondence.
The present embodiment two adopts another kind of judgment mechanism to substitute the counter judging effective duration, after the Beamforming Report Poll frame that Beamformee receives from Beamformer, sent VHT Compressed Beamforming content frame can be determined again according to result of determination, if effectively, then send the VHT Compressed Beamforming frame comprising weights; Otherwise, send the VHT Compressed Beamforming frame not comprising weights.
Wherein, judge that the whether effective deterministic process of compressional wave beam forming (i.e. weights) is:
1) Doppler frequency shift is calculated by Beamformee self rate travel:
In formula, v
beamformeefor the speed of Beamformee movement, f
cfor carrier frequency; c
0for the light velocity;
2) channel similarity ρ is set
t, then by this Similarity Measure effective time
its computing formula is:
3) suppose that calculating weights are T to the time of feedback compressional wave beam forming form
report, then before feedback compressional wave beam forming form, compare T
reportwith
size (η is the coefficient preset, can by feedback time and feed back to figuration Time dependent, as
t
beamfor Beamformer receives these weights to the time using weights, it can be empirical value; Also only ρ can be passed through
t, control now η=1):
4) if
set up, then judge that now compressional wave beam forming form is effective, then by this compressional wave beam forming form with VHT Compressed Beamforming frame for carrier sends to Beamformer.
5)
then judge that compressional wave beam forming form is invalid, transmission one is not comprised the VHT Compressed Beamforming frame of compressional wave beam forming form element.
Embodiment three
The present embodiment three is with the difference of embodiment one or embodiment two: Beamformer can indicate Beamformee to calculate effective duration of weights, and described Beamformee effective duration as indicated determines effective duration of these weights.Other processes of this example three and embodiment together, specifically comprise:
1), Beamformer can indicate Beamformee calculate effective duration of weights, the indicating means of described effective duration comprises following several mode:
A, Beamformer indicate effective duration of single Beamformee setup algorithm weights by mode of unicast, specifically comprise: Beamformer, before transmission NDPA frame, transmits to single Beamformee the mac frame that comprises described effective duration information (i.e. first effective duration information).Described mac frame can be association request frame or association response frame carrying out capability negotiation, and also can be other form frame, such as Frame, management frames or control frame etc., the present embodiment be restricted.
B, Beamformer indicate effective duration of multiple Beamformee setup algorithm weights (i.e. second effective duration information) by multicast mode, specifically comprise: send NDPA frame at Beamformer to multiple Beamformee, described NDPA frame comprises described effective duration information (i.e. second effective duration information), described effective duration information can be arranged in the RA field in NDPA, also can equipment in other fields in NDPA, the present embodiment is not restricted.
Certainly, described effective duration information also can be with Frame, management frames or control frame etc. that multicast form sends before NDPA frame sends.
C, Beamformer are by the effective duration of broadcast mode instruction with all site STA setup algorithm weights in BSS/IBSS network, specifically comprise: AP sends beacon frame to all site STA in BSS/IBSS network, and described beacon frame includes effective duration information (i.e. first effective duration information).
Certainly, also can be with Frame, disassociation frame or control frame etc. that the forms of broadcasting send before NDPA frame sends.
2), Beamformee receives the NDPA frame that Beamformer sends, and known oneself become Beamformee to be measured by the AID of STA info field, and enters test mode and wait for that Beamfomer sends NDP frame.
3), Beamformee receives test signal NDP frame, calculate channel estimation value, and calculate beamforming weights coefficient according to channel estimation value, and be saved in VHT compressional wave beam forming form element, simultaneously according to described effective duration setting counter duration that Beamformer specifies to it, start described counter, described counter counts down;
4), Beamformee receiving the beam forming response request frame from Beamforer, when being required feedback weight information by Beamformer, then first judge the described weights preserved whether determine effectively again send the form of VHT compressional wave beam forming frame.
If described counter does not make zero, then judge that described weights are now still effective, send the VHT compressional wave beam forming frame comprising VHT compressional wave beam forming form element simultaneously to Beamformer.
If described counter clear, then judge that described weights are now invalid, transmission one is not comprised the VHT compressional wave beam forming frame of compressional wave beam forming form element;
5), Beamformee empties the value information in VHT compressional wave beam forming form element.
In the embodiment of the present invention, by set effective duration counter and effective time comparison mechanism judge preserve the validity of feedback weight, and then determine the content (namely whether comprising VHT compressional wave beam forming form element) that the VHT CompressedBeamforming frame that it sends comprises, the information expires phenomenon that Beamformer collects can be prevented, save the cost of possession to channel resource, improve communication quality.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (26)
1. a transmission method for weights, is characterized in that, comprising:
The channel test signal that the shaping sender of received beam sends;
Channel is tested and obtains corresponding weights;
Determine effective duration that described weights are corresponding;
Described weights are kept at very in high-throughput VHT compressional wave beam forming form element;
In effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender;
Wherein, in effective duration of described weights, before sending described VHT compressional wave beam forming form element to described beam forming sender, described method also comprises:
Judge that whether described weights are effective, if effectively, then perform in effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender; Otherwise, when described weights are invalid, send the VHT compressional wave beam forming frame not comprising described VHT compressional wave beam forming form element to described beam forming sender.
2. method according to claim 1, is characterized in that, before receiving channel test signal, described method also comprises:
The channel test signal that the shaping promoter of received beam sends is noticed;
Notice to confirm self whether to be beam forming recipient to be measured according to described channel test signal, if so, then receive channel test signal, to the step that channel is tested described in performing.
3. method according to claim 1, is characterized in that, before send described VHT compressional wave beam forming form element to described beam forming sender, described method also comprises: the beam forming response request frame that the shaping sender of received beam sends.
4. method according to claim 3, it is characterized in that, described method also comprises: judge whether self is the first beam forming recipient specified during described channel test signal is noticed, if, perform in effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender; Otherwise, perform the beam forming response request frame that the shaping sender of described received beam sends; In effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender.
5. method according to claim 1, is characterized in that, describedly sends described VHT compressional wave beam forming form element to described beam forming sender and specifically comprises:
Described VHT compressional wave beam forming form element is sent to described beam forming sender by VHT compressional wave beam forming frame.
6. method according to claim 1, is characterized in that, the described effective duration determining that described weights are corresponding comprises:
Determine self translational speed of beam forming recipient; Carry out stepping according to the size of described translational speed, obtain the speed of different shelves; For effective duration that each grade of Speed Setting is corresponding, described effective duration is controlled by counter; Described effective weights are being kept in VHT compressional wave beam forming form element, are starting counter counts down; Or
Doppler frequency shift is calculated according to the rate travel of beam forming recipient; According to effective duration of described Doppler frequency shift and channel Similarity Measure weights.
7. method according to claim 1, is characterized in that, described method also comprises: after judging that described weights are invalid, empties the described weights in described VHT compressional wave beam forming form element.
8. method according to claim 1, is characterized in that, described judge described weights whether effective process comprise:
Judge whether the counting of counter makes zero, if the counting of counter does not make zero, then judge that described weights are effective; Otherwise, judge that described weights are invalid; Or
The time T in effective duration of more described weights and setup algorithm weights moment to feedback weight moment, if described time T is less than or equal to effective duration of weights, then judges that described weights are effective; Otherwise no person judges that described weights are invalid.
9. method according to claim 2, is characterized in that, before the channel test signal notice that the shaping promoter of received beam sends, described method also comprises:
The media access control MAC frame that the shaping promoter of received beam sends, described mac frame comprises first effective duration information of instruction weight setting;
The described effective duration determining that described weights are corresponding is specially: determine according to first effective duration information of the instruction weight setting in described mac frame effective duration that described weights are corresponding.
10. method according to claim 9, is characterized in that, described mac frame comprises: broadcast MAC frame, multicast MAC frames or clean culture mac frame.
11. methods according to claim 10, is characterized in that, described broadcast MAC frame is beacon frame, and described multicast MAC frames is NDPA frame; Described clean culture mac frame is association request frame or association response frame.
12. methods according to claim 9, is characterized in that,
The media access control (MAC) frame that the shaping promoter of described received beam sends specifically comprises: the media access control (MAC) frame sent by the shaping promoter of clean culture, broadcast or multicast mode received beam.
13. methods according to claim 2, it is characterized in that, the receiving terminal address RA field that described channel test signal is noticed comprises second effective duration information of instruction weight setting, wherein, described second effective duration information and first effective duration identical or different
The described effective duration determining that described weights are corresponding is specially: determine according to second effective duration information of described instruction weight setting effective duration that described weights are corresponding.
The transmitting device of 14. 1 kinds of weights, is characterized in that, comprising:
First receiving element, for the channel test signal that the shaping sender of received beam sends;
Test cell, obtains corresponding weights for testing channel;
Determining unit, for determining effective duration that described weights are corresponding;
Memory cell, for being kept at very in high-throughput VHT compressional wave beam forming form element by described weights;
3rd judging unit, for judging that whether weights are effective, if effectively, sends to the first transmission unit by effective for weights judged result; Judged result invalid for weights is sent to the 3rd transmission unit;
Described first transmission unit, in effective duration of described weights, sends described VHT compressional wave beam forming form element to described beam forming sender;
Described 3rd transmission unit, for when described weights are invalid, sends the VHT compressional wave beam forming frame not comprising described VHT compressional wave beam forming form element to described beam forming sender.
15. devices according to claim 14, is characterized in that, also comprise:
Second receiving element, for before described first receiving element receives described channel test signal, the channel test signal that the shaping promoter of received beam sends is noticed;
First judging unit, confirm self whether to be beam forming recipient to be measured for noticing according to described channel test signal, and when confirming self to be beam forming recipient to be measured, start the channel test signal that the shaping sender of described first receiving element received beam sends.
16. devices according to claim 14, is characterized in that, also comprise:
3rd receiving element, is connected with described first transmission unit, for receiving the beam forming response request frame that described beam forming sender sends;
Second transmission unit, for receive at the 3rd receiving element described beam forming sender send beam forming response request frame after, in effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender.
17. devices according to claim 16, is characterized in that, also comprise:
Second judging unit, for judging whether self is the first beam forming recipient specified during described channel test signal is noticed, and sends to the first transmission unit by the judged result being; No judged result is sent to the second transmission unit.
18. devices according to claim 14, is characterized in that, described first transmission unit specifically for: send described VHT compressional wave beam forming form element by VHT compressional wave beam forming frame to described beam forming sender.
19. devices according to claim 14, is characterized in that, described determining unit comprises:
Speed determining unit, for determining self translational speed of beam forming recipient;
Stepping unit, carries out stepping for the size according to described translational speed, obtains the speed of different shelves;
Duration setup unit, for being effective duration corresponding to each grade of Speed Setting, described effective duration is controlled by counter;
Count enable unit, for when described weights are kept in VHT compressional wave beam forming form element by described memory cell, starts counter counts down.
20. devices according to claim 14, is characterized in that, described determining unit comprises:
Frequency displacement computing unit, calculates Doppler frequency shift for the rate travel according to beam forming recipient;
Duration calculation unit, for the effective duration according to described Doppler frequency shift and channel Similarity Measure weights.
21. devices according to claim 14, is characterized in that, described 3rd judging unit comprises:
Counting judging unit, for judging whether the counting of counter makes zero, if the counting of counter does not make zero, then determines that described weights are effective, effective for weights judged result is sent to described first transmission unit; Otherwise, determine that described weights are invalid, judged result invalid for weights sent to described 3rd transmission unit; And/or
Comparison judgment unit, for comparing effective duration of weights and the time T calculating weights moment to the feedback weight moment; If described time T is not more than effective duration of weights, then determines that described weights are effective, effective for weights judged result is sent to described first transmission unit; Otherwise, determine that described weights are invalid, judged result invalid for weights sent to described 3rd transmission unit.
22. devices according to claim 14, is characterized in that, described device also comprises: delete cells, are connected with the 3rd judging unit, for after judging that described weights are invalid, empty the described weights in described VHT compressional wave beam forming form element.
23. devices according to claim 15, is characterized in that, before the channel test signal notice that the shaping promoter of described second receiving element received beam sends, described device also comprises:
4th receiving element, for the media access control MAC frame that the shaping promoter of received beam sends, described mac frame comprises first effective duration information of instruction weight setting;
Described determining unit specifically for: determine according to first effective duration information of the instruction weight setting in described mac frame effective duration that described weights are corresponding.
24. devices according to claim 23, it is characterized in that, the described mac frame that described 4th receiving element receives comprises: broadcast MAC frame, multicast MAC frames and clean culture mac frame, wherein, described broadcast MAC frame is beacon frame, and described multicast MAC frames is NDPA frame; Described clean culture mac frame is association request frame or association response frame.
25. devices according to claim 23, is characterized in that, described 4th receiving element, especially by the media access control MAC frame that the shaping promoter of clean culture, broadcast or multicast mode received beam sends.
26. devices according to claim 15, it is characterized in that, when the receiving terminal address RA field that the described channel test signal that described second receiving element receives is noticed comprises second effective duration information of instruction weight setting, described second effective duration information and first effective duration information identical or different
Described determining unit specifically for: determine according to second effective duration information of described instruction weight setting effective duration that described weights are corresponding.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110271773.XA CN103001680B (en) | 2011-09-14 | 2011-09-14 | Method and device for transmitting weight |
| PCT/CN2012/081421 WO2013037313A1 (en) | 2011-09-14 | 2012-09-14 | Weight transmission method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110271773.XA CN103001680B (en) | 2011-09-14 | 2011-09-14 | Method and device for transmitting weight |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103001680A CN103001680A (en) | 2013-03-27 |
| CN103001680B true CN103001680B (en) | 2015-04-08 |
Family
ID=47882626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110271773.XA Expired - Fee Related CN103001680B (en) | 2011-09-14 | 2011-09-14 | Method and device for transmitting weight |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103001680B (en) |
| WO (1) | WO2013037313A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726974A (en) | 2019-10-17 | 2020-01-24 | 北京邮电大学 | Radar detection method and device based on radar communication integration |
| WO2022047646A1 (en) * | 2020-09-02 | 2022-03-10 | Huawei Technologies Co., Ltd. | Devices for beamforming with extended codebook size |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158975A (en) * | 2009-12-23 | 2011-08-17 | 英特尔公司 | Scheduling mechanisms for media access control protection and channel sounding |
| WO2011103367A1 (en) * | 2010-02-17 | 2011-08-25 | Qualcomm Incorporated | Method and apparatus for supporting adaptive channel state information feedback rate in multi-user communication systems |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101452504B1 (en) * | 2008-06-18 | 2014-10-23 | 엘지전자 주식회사 | Channel access mechanism for Very High Throughput (VHT) wireless local access network system and station supporting the channel access mechanism |
| WO2010118383A1 (en) * | 2009-04-10 | 2010-10-14 | Marvell World Trade Ltd. | Signaling for multi-dimension wireless resource allocation |
| US8576804B2 (en) * | 2009-08-13 | 2013-11-05 | Broadcom Corporation | Beamforming feedback frame formats within multiple user, multiple access, and/or MIMO wireless communications |
| CN102696195B (en) * | 2009-12-02 | 2016-01-20 | 马维尔国际贸易有限公司 | For the method and apparatus detected multiple station |
-
2011
- 2011-09-14 CN CN201110271773.XA patent/CN103001680B/en not_active Expired - Fee Related
-
2012
- 2012-09-14 WO PCT/CN2012/081421 patent/WO2013037313A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158975A (en) * | 2009-12-23 | 2011-08-17 | 英特尔公司 | Scheduling mechanisms for media access control protection and channel sounding |
| WO2011103367A1 (en) * | 2010-02-17 | 2011-08-25 | Qualcomm Incorporated | Method and apparatus for supporting adaptive channel state information feedback rate in multi-user communication systems |
Non-Patent Citations (1)
| Title |
|---|
| "IEEE P802.11 Wireless LANs,Proposed TGac Draft Amendment";Chin-Hung(Jackson) Chen,et al.;《IEEE 802.11-10/1361r3》;20110118;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103001680A (en) | 2013-03-27 |
| WO2013037313A1 (en) | 2013-03-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101387776B1 (en) | Measurement support for a smart antenna in a wireless communication system | |
| CN102204372B (en) | Indoor localization system for locating electronic mobile device within indoor environment | |
| CN102595569B (en) | Carrier sense method and system | |
| CN102368697B (en) | Interferometry signals, interferometry and feedback method and its device | |
| CN101419276B (en) | Method for positioning main user in cognition radio network | |
| CN104956237B (en) | Method for estimating distance, transmitted power control method, user's set and base station | |
| CN107979402A (en) | A kind of channel state information measurement and device | |
| EP2765811A1 (en) | Method, apparatus, terminal and computer program product for determining transmission mode | |
| WO2009084609A4 (en) | System, method, apparatus and program storage medium for the generation and transmission of delivery confirmation messages in a wireless communication system | |
| EP2982208B1 (en) | Mechanism for group polling without precise timing | |
| US10819451B2 (en) | Method of reporting RSSI measurements in an unlicensed band and related apparatus | |
| RU2006132501A (en) | SYSTEM AND METHOD FOR MANAGING A STRIP SUBCANAL WITH ADAPTIVE MODULATION AND CODING (AMC) IN A MULTIPLE ACCESS COMMUNICATION SYSTEM WITH ORTHOGON-FREQUENCY SEPARATION | |
| CN102404689A (en) | Method and device for receiving and sending crime scene investigation (CSI)- radio station (RS) configuration information | |
| CN110460361A (en) | Determine method, user equipment and the base station of pre-coding matrix instruction | |
| CN104168050A (en) | Channel information feedback method and equipment | |
| CN104823386A (en) | Wireless station and methods for ToF positioning using reverse-direction grant | |
| CN109245849A (en) | modulation coding method, device, base station and computer readable storage medium | |
| CN109245851A (en) | A kind of method and apparatus of radio frame transmission | |
| US20230379012A1 (en) | Mimo beamforming based sensing method and related apparatus | |
| CN103001680B (en) | Method and device for transmitting weight | |
| CN102572851B (en) | The method and apparatus of control channel resource is obtained in cognitive radio | |
| CN102377464A (en) | Sending method and device of reference signals for downlink channel state measurement | |
| US20200177264A1 (en) | Indicating beams for wireless communication | |
| CN101686071A (en) | Method for transmitting and receiving channel quality information and device thereof | |
| CN102027783A (en) | Technique for broadcasting via a communication network node |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 |