CN103001744A - Channel measuring information feedback method and STA (station) - Google Patents
Channel measuring information feedback method and STA (station) Download PDFInfo
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Abstract
The invention discloses a channel measuring information feedback method. The method includes: when the dimension of channel measurement information which needs to be fed back and instructed by channel measurement requesting information received by an STA is larger than the number of actual receiving antennas of the STA, channel measurement feedback information is transmitted by the STA to an AP (access point), the column number of a feedback matrix formed by compressed beams carried in the channel measurement feedback information transmitted by the STA is identical to the number of the actual receiving antennas of the STA, or the column number of the feedback matrix formed by compressed beams carried in the channel measurement feedback information transmitted by the STA is identical to the dimension value of the channel measurement information which needs to be fed back and instructed by channel the measurement requesting information received by the STA, or the STA transmits empty channel measurement feedback information. The invention correspondingly discloses the STA. Via the channel measuring information feedback method and the STA, channel measurement information can be accurately fed back, and performance of a system can be improved.
Description
Technical field
The present invention relates to wireless communication field, especially a kind of channel measurement information feedback method and website (Station, STA).
Background technology
At present, in field of wireless, WLAN (wireless local area network) (WLAN) fast development, growing to the demand requirement that WLAN covers, also more and more higher to the requirement of throughput.In the Institute of Electrical and Electric Engineers industrial specification IEEE802.11 group, successively defined 802.11a, 802.11b, 802.11g etc. a series of prevailing WLAN technical standards, other task groups have appearred again subsequently successively, be devoted to develop the standard that relates to existing 802.11 technological improvements, for example, 802.11n task groups proposes high-throughput (High throughput, HT) requirement, introduce multiple-input, multiple-output (MIMO) and wave beam forming technology, support is up to the data rate of 600Mbps, 802.11ac task groups further proposes the concept of VHT (Very High throughput), by introducing larger channel width, the technology such as the MIMO of high-order and multi-user's multiple-input, multiple-output (MU-MIMO) more, data rate can reach more than the 1Gbps.
In WLAN, an access point (access point, AP) and a plurality of websites (Station, STA) that are associated with AP have formed a Basic Service Set (basic service set, BSS).
In current 802.11ac system, only support descending MU-MIMO transmission, namely only have AP can send the MU-MIMO packet.In order to carry out MU-MIMO transmission, AP need to be known the channel information between itself and the STA.At present agreement predetermined channel measurement and information interaction need be by empty packet bulletin (Null Data Packet Announcement, NDPA), empty packet (Null Data Packet, NDP), VHT compressional wave beam shaping (VHT Compressed Beamforming) and these four kinds of frames of beam forming report training in rotation (Beamforming Report Poll) exchange to finish, wherein, NDPA is used for the information that notice need to be carried out the STA of channel measurement, the associated identifiers (association identifier, AID) that comprises STA, the dimension (representing with Nc) of feedback kind (dividing into alone family or multi-user) and feedback; NDP is used as measuring reference signals, and namely STA will carry out channel measurement based on the NDP that receives; VHT Compressed Beamforming is used for feeding back treated channel information, carries in addition the information relevant with channel feedback such as VHT MIMO Control; Beamforming Report Poll is used for the not yet STA of feedback channel metrical information of poll, notifies it to carry out feedback of channel information.
Be the scene of MU form for the channel feedback type, agreement has following provisions: " if feedback kind is set to MU; in the feedback that STA sends; the value in the Nc territory in the entrained VHT MIMO Control territory must equal the value in the Nc territory in this STA information that NDPA carries ", can find out, more than regulation is that the current actual reception antenna that the value in the Nc territory in the supposition NDPA STA information of carrying is not more than this STA is counted in the situation, but, there is such problem, if because some reason, go wrong and to work such as current certain reception antenna of STA, and this STA does not in time notify AP yet, AP still arranges the value in the Nc territory of this STA according to the information that obtains before in NDPA, this the value in the Nc territory in the STA information that NDPA carries just may occur greater than the situation of the actual reception antenna number of this STA, but, still do not have at present to propose in the situation of value greater than the actual reception antenna number of this STA in the Nc territory in the STA information that NDPA carries, how STA carries out the solution of feedback operation, thereby accurately the feedback channel metrical information affects systematic function.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of channel measurement information feedback method and STA, and accurately the feedback channel metrical information improves systematic function.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of channel measurement information feedback method comprises:
The channel measurement information dimension of the need feedback that the channel measurement solicited message that site STA receives is indicated is greater than the actual reception antenna number of described STA;
STA measures feedback information to access point AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.
The channel measurement solicited message that described STA receives is carried in the sky packet bulletin NDPA frame.
The channel measurement information dimension value of the need feedback that the channel measurement solicited message that described STA receives is indicated is carried in the Nc subdomain corresponding with described STA in the NDPA frame.
The beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna of described STA when counting, and the beamforming feedback matrix information of compression is the information after the actual channel metrical information is compressed.
When the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, the beamforming feedback matrix information of compression comprises the information after the compression of actual channel metrical information and the invalid information of increase, perhaps to the compressed information after the actual channel metrical information interpolation invalid information.
The channel measurement feedback information that described STA sends is carried in the beam forming VHT Compressed Beamforming frame of VHT compression.
The beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame in the Nc subdomain in the VHT MIMO Control territory.
Described STA sends empty channel measurement feedback information: the beamforming feedback matrix information that does not comprise compression in the VHT Compressed Beamforming frame, and by the remaining segment Remaining Segments subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame and first segmentation First Segment subdomain joint instructions, the value of Nc subdomain is set to 0, perhaps according to the value setting of the corresponding Nc subdomain of STA in the NDPA frame, perhaps be set to the arbitrary value that the Nc subdomain can represent.
A kind of STA, this STA is used for when the channel measurement information dimension of the indicated need feedback of the channel measurement solicited message that receives is counted greater than the actual reception antenna of described STA, measure feedback information to the AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.
The channel measurement solicited message that described STA receives is carried in the sky packet bulletin NDPA frame.
The channel measurement information dimension value of the need feedback that the channel measurement solicited message that described STA receives is indicated is carried in the Nc subdomain corresponding with described STA in the NDPA frame.
The beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna of described STA when counting, and the beamforming feedback matrix information of compression is the information after the actual channel metrical information is compressed.
When the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, the beamforming feedback matrix information of compression comprises the information after the compression of actual channel metrical information and the invalid information of increase, perhaps to the compressed information after the actual channel metrical information interpolation invalid information.
The channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame.
The beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame in the Nc subdomain in the VHT MIMO Control territory.
Described STA sends empty channel measurement feedback information: the beamforming feedback matrix information that does not comprise compression in the VHT Compressed Beamforming frame, and by the remaining segment in the VHT MIMO Control territory in the VHT Compressed Beamforming frame and two subdomain joint instructions of first segmentation, the value of Nc subdomain is set to 0, perhaps according to the value setting of the corresponding Nc subdomain of STA in the NDPA frame, perhaps be set to the arbitrary value that the Nc subdomain can represent.
Channel measurement information feedback method of the present invention and STA, when the channel measurement information dimension of the need feedback that the channel measurement solicited message that site STA receives is indicated is counted greater than the actual reception antenna of described STA, STA measures feedback information to access point AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.By the present invention, when the channel measurement information dimension of the need feedback that the channel measurement solicited message that receives at STA is indicated was counted greater than the actual reception antenna of described STA, accurate feedback channel metrical information still was so can improve systematic function.
Description of drawings
Fig. 1 is channel measurement information feedback method schematic flow sheet of the present invention.
Embodiment
Basic thought of the present invention is: when the channel measurement information dimension of the need feedback that the channel measurement solicited message that site STA receives is indicated is counted greater than the actual reception antenna of described STA, STA measures feedback information to access point AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.
Fig. 1 is channel measurement information feedback method schematic flow sheet of the present invention, and as shown in Figure 1, the method comprises:
Step 101: carry out under the scene of MU-MIMO channel measurement feedback, the channel measurement information dimension of the need feedback that the channel measurement solicited message that STA receives is indicated is greater than the actual reception antenna number of described STA.
Preferably, the channel measurement solicited message that STA receives is carried in the NDPA frame, and is concrete, and the channel measurement information dimension value of the need feedback that the channel measurement solicited message that STA receives is indicated is carried in the Nc subdomain corresponding with described STA in the NDPA frame.
Step 102:STA measures feedback information to the AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.
Preferably, when the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that STA sends equaled the actual reception antenna of described STA and counts, the beamforming feedback matrix information of compression was the information after the actual channel metrical information is compressed.
Preferably, when the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, the beamforming feedback matrix information of compression comprises the information after the compression of actual channel metrical information and the invalid information of increase, perhaps to the compressed information after the actual channel metrical information interpolation invalid information.The contained information of part rows in the beamforming feedback matrix of described invalid information finger pressure contracting, AP detects this information and thinks that namely the data of this part rows of feeding back are unavailable, and the number of described part rows equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that STA receives and the difference of the actual reception antenna number of STA.
Preferably, the channel measurement feedback information that STA sends is carried in the VHT Compressed Beamforming frame, concrete, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame in the Nc subdomain in the VHT MIMO Control territory.
Need to prove, STA sends the beamforming feedback matrix information that empty channel measurement feedback information refers to not comprise in the VHT Compressed Beamforming frame compression, and (namely indicate the beamforming feedback matrix that does not comprise compression in this frame by the remaining segment in the VHT MIMO Control territory in the VHT Compressed Beamforming frame and two subdomain joint instructions of first segmentation, because the position in VHT MIMO Control territory is before feedback matrix), the value of Nc subdomain is set to 0, perhaps according to the value setting of the corresponding Nc subdomain of STA in the NDPA frame, perhaps be set to the arbitrary value that the Nc subdomain can represent.
The present invention also correspondingly proposes a kind of STA, this STA is used for when the channel measurement information dimension of the indicated need feedback of the channel measurement solicited message that receives is counted greater than the actual reception antenna of described STA, measure feedback information to the AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.
The channel measurement solicited message that described STA receives is carried in the sky packet bulletin NDPA frame.
The channel measurement information dimension value of the need feedback that the channel measurement solicited message that described STA receives is indicated is carried in the Nc subdomain corresponding with described STA in the NDPA frame.
The beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna of described STA when counting, and the beamforming feedback matrix information of compression is the information after the actual channel metrical information is compressed.
When the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, the beamforming feedback matrix information of compression comprises the information after the compression of actual channel metrical information and the invalid information of increase, perhaps to the compressed information after the actual channel metrical information interpolation invalid information.
The channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame.
The beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame in the Nc subdomain in the VHT MIMO Control territory.
Described STA sends empty channel measurement feedback information: the beamforming feedback matrix information that does not comprise compression in the VHT Compressed Beamforming frame, and by the remaining segment in the VHT MIMO Control territory in the VHT Compressed Beamforming frame and two subdomain joint instructions of first segmentation, the value of Nc subdomain is set to 0, perhaps according to the value setting of the corresponding Nc subdomain of STA in the NDPA frame, perhaps be set to the arbitrary value that the Nc subdomain can represent.
Below in conjunction with specific embodiment technical scheme of the present invention is described further, be to be understood that, preferred embodiment described herein only is used for description and interpretation the present invention, be not intended to limit the present invention, in the situation of not conflicting, embodiment and the feature among the embodiment among the present invention can make up mutually.
Embodiment 1
In the present embodiment, suppose among the current WLAN that have an AP and N STA, wherein N is positive integer, STA is referred to as respectively STA1 ..., STAN; This WLAN supports descending MU-MIMO transmission.
Under above supposition, if this moment, AP carried out channel measurement before need to sending data to a plurality of STA in its coverage, so, AP will send NDPA frame and NDP frame, wherein, carry the indication information of a plurality of STA in the NDPA frame, suppose the indication information that carries two STA among the NDPA, be respectively the indication information of STA1 and STA2, for the concrete indication information of STA1 be: the identifier of STA1, feedback kind are that the value in MU and Nc territory is 4; Concrete indication information for STA2 is: the identifier of STA2, feedback kind are that the value in MU and Nc territory is 2; AP sends short interFrameGap (the Short Interframe Space behind the NDPA, be called for short SIFS) the rear NDP of transmission frame, according to current protocol rule, STA1 sends VHT Compressed Beamforming frame after receiving SIFS interval behind the NDP, STA2 just can send VHTCompressed Beamforming frame after need to waiting for and receiving the Beamforming Report Poll frame that sends to oneself.
The actual available reception antenna of supposing current STA1 is 2, be that the reception antenna number is less than the value in the corresponding Nc of STA1 territory in the NDPA frame, this moment, STA1 carried out channel measurement according to 2 reception antennas of reality, and measurement result information compressed processing according to agreement regulation, set up VHT Compressed Beamforming frame and send to AP, wherein, the value of the Nc subdomain in the VHTMIMO Control territory in the VHT Compressed Beamforming frame is set to 2 according to actual reception antenna number, and the channel measurement information of feedback is the beamforming feedback matrix after the compression.
The actual available reception antenna of supposing current STA2 is 2, STA2 carries out channel measurement according to 2 reception antennas of reality, and measurement result information compressed processing according to agreement regulation, after receiving that AP sends to the Beamforming Report Poll frame of oneself, set up VHT Compressed Beamforming frame, wherein the value of the Nc subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame is set to 2 according to the value in the corresponding Nc of STA2 territory in the NDPA frame, and the channel measurement information of feedback is the beamforming feedback matrix after the compression.
Embodiment 2
In the present embodiment, suppose among the current WLAN that have an AP and N STA, wherein N is positive integer, STA is referred to as respectively STA1 ..., STAN; This WLAN supports descending MU-MIMO transmission.
Under above supposition, if this moment, AP carried out channel measurement before need to sending data to a plurality of STA in its coverage, AP will send NDPA frame and NDP frame so, wherein carry the indication information of a plurality of STA in the NDPA frame, suppose the indication information that carries two STA among the NDPA, be respectively the indication information of STA1 and STA2, for the concrete indication information of STA1 be: the identifier of STA1, feedback kind are that the value in MU and Nc territory is 4; Concrete indication information for STA2 is: the identifier of STA2, feedback kind are that the value in MU and Nc territory is 2; AP sends the NDP frame after sending SIFS interval behind the NDPA, according to current protocol rule, STA1 sends VHT Compressed Beamforming frame after receiving SIFS interval behind the NDP, STA2 just can send VHT Compressed Beamforming frame after need to waiting for and receiving the Beamforming Report Poll frame that sends to oneself.
The actual available reception antenna of supposing current STA1 is 2, be that the reception antenna number is less than the value in the corresponding Nc of STA1 territory in the NDPA frame, this moment, STA1 carried out channel measurement according to 2 reception antennas of reality, and measurement result information compressed processing according to agreement regulation, set up VHT Compressed Beamforming frame and send to AP, wherein the value of the Nc subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame is set to 4 according to the value in the corresponding Nc of STA1 territory in the NDPA frame, and the channel measurement information of feedback is two row channel feedback information and two compressional wave beam shaping feedback matrixs that comprise the column vector composition of invalid information after the compression.
The actual available reception antenna of supposing current STA2 is 2, STA2 carries out channel measurement according to 2 reception antennas of reality, and measurement result information compressed processing according to agreement regulation, after receiving that AP sends to the Beamforming Report Poll frame of oneself, set up VHT Compressed Beamforming frame, wherein the value of the Nc subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame is set to 2 according to the value in the corresponding Nc of STA2 territory in the NDPA frame, and the channel measurement information of feedback is the beamforming feedback matrix after the compression.
Embodiment 3
In the present embodiment, suppose among the current WLAN that have an AP and N STA, wherein N is positive integer, STA is referred to as respectively STA1 ..., STAN; This WLAN supports descending MU-MIMO transmission.
Under above supposition, if this moment, AP carried out channel measurement before need to sending data to a plurality of STA in its coverage, AP will send NDPA frame and NDP frame so, wherein carry the indication information of a plurality of STA in the NDPA frame, suppose the indication information that carries two STA among the NDPA, be respectively the indication information of STA1 and STA2, for the concrete indication information of STA1 be: the identifier of STA1, feedback kind are that the value in MU and Nc territory is 4; Concrete indication information for STA2 is: the identifier of STA2, feedback kind are that the value in MU and Nc territory is 2; AP sends the NDP frame after sending SIFS interval behind the NDPA, according to current protocol rule, STA1 sends VHT Compressed Beamforming frame after receiving SIFS interval behind the NDP, STA2 just can send VHT Compressed Beamforming frame after need to waiting for and receiving the Beamforming Report Poll frame that sends to oneself.
The actual available reception antenna of supposing current STA1 is 2, be that the reception antenna number is less than the value in the corresponding Nc of STA1 territory in the NDPA frame, this moment, STA1 carried out channel measurement according to 2 reception antennas of reality, then after actual measurement information being added invalid information, again the united information of actual measurement information and invalid information compressed processing according to the agreement regulation, set up VHT Compressed Beamforming frame and send to AP, wherein the value of the Nc subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame is set to 4 according to the value in the corresponding Nc of STA1 territory in the NDPA frame, the channel measurement information of feedback is that this matrix is totally 4 row to the compressional wave beam shaping feedback matrix of composition after the united information compression of actual measurement information and invalid information.
The actual available reception antenna of supposing current STA2 is 2, STA2 carries out channel measurement according to 2 reception antennas of reality, and measurement result information compressed processing according to agreement regulation, after receiving that AP sends to the Beamforming Report Poll frame of oneself, set up VHT Compressed Beamforming frame, wherein the value of the Nc subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame is set to 2 according to the value in the corresponding Nc of STA2 territory in the NDPA frame, and the channel measurement information of feedback is the beamforming feedback matrix after the compression.
Embodiment 4
In the present embodiment, suppose among the current WLAN that have an AP and N STA, wherein N is positive integer, STA is referred to as respectively STA1 ..., STAN; This WLAN supports descending MU-MIMO transmission.
Under above supposition, if this moment, AP carried out channel measurement before need to sending data to a plurality of STA in its coverage, AP will send NDPA frame and NDP frame so, wherein carry the indication information of a plurality of STA in the NDPA frame, suppose the indication information that carries two STA among the NDPA, be respectively the indication information of STA1 and STA2, for the concrete indication information of STA1 be: the identifier of STA1, feedback kind are that the value in MU and Nc territory is 4; Concrete indication information for STA2 is: the identifier of STA2, feedback kind are that the value in MU and Nc territory is 2; AP sends the NDP frame after sending SIFS interval behind the NDPA, according to current protocol rule, STA1 sends VHT Compressed Beamforming frame after receiving SIFS interval behind the NDP, STA2 just can send VHT Compressed Beamforming frame after need to waiting for and receiving the Beamforming Report Poll frame that sends to oneself.
The actual available reception antenna of supposing current STA1 is 2, be that the reception antenna number is less than the value in the corresponding Nc of STA1 territory in the NDPA frame, this moment, STA1 received NDP SIFS afterwards, send VHT Compressed Beamforming frame and send to AP, wherein the bit that comprises of the remaining segment subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame all is set to 1, the bit that first segmentation subdomain comprises all is set to 0, the value of Nc subdomain is set to 0 or be set to 4 or the arbitrary value that subdomain for this reason can represent is set according to the value in the corresponding Nc of STA1 territory in the NDPA frame, other subdomain in the VHT MIMO Control territory all is set to 0, and this frame does not carry the channel measurement feedback information simultaneously.
The actual available reception antenna of supposing current STA2 is 2, STA2 carries out channel measurement according to 2 reception antennas of reality, and measurement result information compressed processing according to agreement regulation, after receiving that AP sends to the Beamforming Report Poll frame of oneself, set up VHT Compressed Beamforming frame, wherein the value of the Nc subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame is set to 2 according to the value in the corresponding Nc of STA2 territory in the NDPA frame, and the channel measurement information of feedback is the beamforming feedback matrix after the compression.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. channel measurement information feedback method is characterized in that the method comprises:
The channel measurement information dimension of the need feedback that the channel measurement solicited message that site STA receives is indicated is greater than the actual reception antenna number of described STA;
STA measures feedback information to access point AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.
2. channel measurement information feedback method according to claim 1 is characterized in that, the channel measurement solicited message that described STA receives is carried in the sky packet bulletin NDPA frame.
3. channel measurement information feedback method according to claim 2 is characterized in that, the channel measurement information dimension value of the need feedback that the channel measurement solicited message that described STA receives is indicated is carried in the Nc subdomain corresponding with described STA in the NDPA frame.
4. channel measurement information feedback method according to claim 1, it is characterized in that, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna of described STA when counting, and the beamforming feedback matrix information of compression is the information after the actual channel metrical information is compressed.
5. channel measurement information feedback method according to claim 1, it is characterized in that, when the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, the beamforming feedback matrix information of compression comprises the information after the compression of actual channel metrical information and the invalid information of increase, perhaps to the compressed information after the actual channel metrical information interpolation invalid information.
6. according to claim 1 to 5 each described channel measurement information feedback methods, it is characterized in that the channel measurement feedback information that described STA sends is carried in the beam forming VHT Compressed Beamforming frame of VHT compression.
7. channel measurement information feedback method according to claim 6, it is characterized in that the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame in the Nc subdomain in the VHT MIMO Control territory.
8. channel measurement information feedback method according to claim 1, it is characterized in that, described STA sends empty channel measurement feedback information: the beamforming feedback matrix information that does not comprise compression in the VHT Compressed Beamforming frame, and by the remaining segment Remaining Segments subdomain in the VHT MIMO Control territory in the VHT Compressed Beamforming frame and first segmentation First Segment subdomain joint instructions, the value of Nc subdomain is set to 0, perhaps according to the value setting of the corresponding Nc subdomain of STA in the NDPA frame, perhaps be set to the arbitrary value that the Nc subdomain can represent.
9. STA, it is characterized in that, this STA is used for when the channel measurement information dimension of the indicated need feedback of the channel measurement solicited message that receives is counted greater than the actual reception antenna of described STA, measure feedback information to the AP transmitting channel, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna number of described STA, perhaps, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, perhaps, described STA sends empty channel measurement feedback information.
10. STA according to claim 9 is characterized in that, the channel measurement solicited message that described STA receives is carried in the sky packet bulletin NDPA frame.
11. STA according to claim 10 is characterized in that, the channel measurement information dimension value of the need feedback that the channel measurement solicited message that described STA receives is indicated is carried in the Nc subdomain corresponding with described STA in the NDPA frame.
12. STA according to claim 9, it is characterized in that, the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the actual reception antenna of described STA when counting, and the beamforming feedback matrix information of compression is the information after the actual channel metrical information is compressed.
13. STA according to claim 9, it is characterized in that, when the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends equals the channel measurement information dimension value of the indicated need feedback of channel measurement solicited message that described STA receives, the beamforming feedback matrix information of compression comprises the information after the compression of actual channel metrical information and the invalid information of increase, perhaps to the compressed information after the actual channel metrical information interpolation invalid information.
14. to 13 each described STA, it is characterized in that according to claim 9 the channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame.
15. STA according to claim 14, it is characterized in that the beamforming feedback matrix column number of the compression of carrying in the channel measurement feedback information that described STA sends is carried in the VHT Compressed Beamforming frame in the Nc subdomain in the VHT MIMO Control territory.
16. STA according to claim 9, it is characterized in that, described STA sends empty channel measurement feedback information: the beamforming feedback matrix information that does not comprise compression in the VHT Compressed Beamforming frame, and by the remaining segment in the VHT MIMO Control territory in the VHT Compressed Beamforming frame and two subdomain joint instructions of first segmentation, the value of Nc subdomain is set to 0, perhaps according to the value setting of the corresponding Nc subdomain of STA in the NDPA frame, perhaps be set to the arbitrary value that the Nc subdomain can represent.
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