CN106533522A - Method and device for transmitting channel state information - Google Patents
Method and device for transmitting channel state information Download PDFInfo
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- CN106533522A CN106533522A CN201510574968.XA CN201510574968A CN106533522A CN 106533522 A CN106533522 A CN 106533522A CN 201510574968 A CN201510574968 A CN 201510574968A CN 106533522 A CN106533522 A CN 106533522A
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- 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
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- 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
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Abstract
The invention discloses a method and device for transmitting channel state information. The method comprises the step of generating a null data packet NDP, wherein the null data packet comprises an HE-LTF (high efficient long training filed) enabling a target STA to carry out channel estimation and a packet expansion field, or the null data packet comprises the HE-LTF enabling the target STA to carry out the channel estimation and extra HE-LTFs. Through application of the method and the device, resource waste resulting from the fact that partial stations do not support immediate feedback can be avoided, and further the efficiency of transmitting the channel state information can be improved.
Description
Technical field
A kind of the present invention relates to communication technical field, more particularly to method and apparatus of transmitting channel state information.
Background technology
At present it is known that a kind of multi-user transmission (MU-MIMO, Multiuser Multiple Input Multiple Output) technology, MU-MIMO utilization spaces dimension realizes multiple users' transmission by multiple parallel channels.But this mode needs transmitting terminal or receiving terminal to have all or part of channel condition information, otherwise just correctly demodulates multichannel useful signal without decree receiving terminal, causes bust thiss.
With WLAN (WLAN，Wireless LAN) technology development，Want to for MU-MIMO technologies to be applied to wlan network，In order to dispatching multiple users carries out the feedback of channel condition information simultaneously，In website (Station，STA when) limited in one's ability，Access point (AP，Access Point) (NDPA can be stated by sending empty packet，Null Data Packet Announcement)、Empty packet (NDP，Null Data Packet) and beam shaping report poll frame (Beamforming Report Poll，BF Report Poll)，So that the efficient long training sequence (HE-LTF that the information that carried according to NDPA of STA and NDP are carried，High efficient long training filed) carry out channel estimation，And to AP feeding back channel state informations within the scope of certain time length.
But, more STA are introduced in 802.11ax standards, some STA can not feed back immediately, for example, STA it is limited in one's ability and do not support to feed back immediately or AP distribution resource-constrained, in these cases, STA cannot carry out the feedback of channel condition information immediately, AP is probably due to wait as long for receiving channel state information and waste of resource, and then channel state information transmission efficiency is reduced.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of method and apparatus of transmitting channel state information, it is possible to increase the efficiency of transmission of channel condition information.
In a first aspect, a kind of method of transmitting channel state information is embodiments provided, including：
Empty packet NDP is generated, comprising efficient long training sequence HE-LTF and filling field in the Empty packet, the filling field is used for allowing targeted sites to have extra time receiving channel state information；
Send the Empty packet.
With reference in a first aspect, in first aspect in the first possible implementation, the filling field includes being grouped extended field or extra HE-LTF.
The first possible implementation with reference to first aspect, in second possible implementation of first aspect, the length of packet extended field or the number of extra HE-LTF symbols are determined by following at least one condition：Bandwidth, the pattern of HE-LTF, the spatial stream number of estimation.
The first possible implementation with reference to first aspect, in first aspect in the third possible implementation, the Empty packet includes indication field, the indication field is located in efficient signaling field HE-SIG of the Empty packet, and the indication field is used for defining packet extended field information or extra HE-LTF information.
The third possible implementation with reference to first aspect, in the 4th kind of possible implementation of first aspect, the packet extended field information includes：The length of packet extended field, or whether packet extended field is more than 16us.
The third possible implementation with reference to first aspect, in the 5th kind of possible implementation of first aspect, the extra HE-LTF information includes：The number of extra HE-LTF symbols, or with the presence or absence of extra HE-LTF.
With reference to the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation of first aspect, the P matrixes of HE-LTF in the Empty packet are selected according to the summation of the extra HE-LTF and HE-LTF for carrying.
With reference to the 6th kind of possible implementation of first aspect, in the 7th kind of possible implementation of first aspect, in the Empty packet, extra HE-LTF is identical with the HE-LTF parts for carrying.
With reference to the 6th kind of possible implementation of first aspect, in the 8th kind of possible implementation of first aspect, in the Empty packet, extra HE-LTF is all identical with the HE-LTF for carrying.
The third possible implementation with reference to first aspect, in the 9th kind of possible implementation of first aspect, it is described packet extended field information and the extra HE-LTF information indicating means at least include it is following any one：Extra bit in HE-SIG, reuses the modulating-coding collection MCS in HE-SIG, reuses the packet extension PE domains in HE-SIG.
Second aspect, embodiments provides a kind of device of transmitting channel state information, including：
Baseband circuit, generates Empty packet NDP, and comprising efficient long training sequence HE-LTF and filling field in the Empty packet, the filling field is used for allowing targeted sites to have extra time receiving channel state information；
Radio circuit, for sending the Empty packet.
With reference to second aspect, in second aspect in the first possible implementation, the filling field includes being grouped extended field or extra HE-LTF.
The first possible implementation with reference to second aspect, in second possible implementation of second aspect, the length of packet extended field or the number of extra HE-LTF symbols are determined by following at least one condition：Bandwidth, the pattern of HE-LTF, the spatial stream number of estimation.
The first possible implementation with reference to second aspect, in second aspect in the third possible implementation, the Empty packet includes indication field, the indication field is located in efficient signaling field HE-SIG of the Empty packet, and the indication field is used for defining packet extended field information or extra HE-LTF information.
The third possible implementation with reference to second aspect, in the 4th kind of possible implementation of second aspect, the packet extended field information includes：The length of packet extended field, or whether packet extended field is more than 16us.
The third possible implementation with reference to second aspect, in the 5th kind of possible implementation of second aspect, the extra HE-LTF information includes：The number of extra HE-LTF symbols, or with the presence or absence of extra HE-LTF.
With reference to the 5th kind of possible implementation of second aspect, in the 6th kind of possible implementation of second aspect, the P matrixes of HE-LTF in the Empty packet are selected according to the summation of the extra HE-LTF and HE-LTF for carrying.
With reference to the 6th kind of possible implementation of second aspect, in the 7th kind of possible implementation of second aspect, in the Empty packet, extra HE-LTF is identical with the HE-LTF parts for carrying.
With reference to the 6th kind of possible implementation of second aspect, in the 8th kind of possible implementation of second aspect, in the Empty packet, extra HE-LTF is all identical with the HE-LTF for carrying.
The third possible implementation with reference to second aspect, in the 9th kind of possible implementation of second aspect, it is described packet extended field information and the extra HE-LTF information indicating means at least include it is following any one：Extra bit in HE-SIG, reuses the modulating-coding collection MCS in HE-SIG, reuses the packet extension PE domains in HE-SIG.
The embodiment of the present invention is by generating Empty packet NDP, comprising the HE-LTF and packet extended field for being used for allowing target STA to carry out channel estimation in the Empty packet, or, comprising the HE-LTF and extra HE-LTF for being used for allowing target STA to carry out channel estimation in the Empty packet, can so avoid part website from not supporting the wasting of resources caused when feeding back immediately, and then the efficiency of transmission of channel condition information can be improved.
Description of the drawings
Fig. 1 is the application scenario diagram of the present invention.
Method flow diagrams of the Fig. 2 for the embodiment of the present invention one；
Fig. 3 is Empty packet structure Fig. 1 in the embodiment of the present invention one.
Fig. 4 is Empty packet structure Fig. 2 in the embodiment of the present invention one.
Entity apparatus structure charts of the Fig. 5 for the embodiment of the present invention two.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings the specific embodiment of the invention is described in further detail.Obviously, embodiments described below is a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, the every other embodiment obtained under the premise of creative work is not made by those of ordinary skill in the art belongs to the scope of protection of the invention.
The embodiment of the present invention can apply to WLAN (English：Wireless Local Area Network, referred to as：WLAN), current WLAN accepted standards are IEEE (English：Institute of Electrical and Electronics Engineers, Chinese：Institute of Electrical and Electric Engineers) it is 802.11 serial.WLAN can include multiple Basic Service Sets (English：Basic Service Set, referred to as：BSS), the network node that basic service is concentrated is website (English：Station, referred to as：STA), website includes the website (abbreviation of access point class：AP, English：Access Point) and non-access point class website (English：None Access Point Station, referred to as：Non-AP STA).Each Basic Service Set can include an AP and multiple Non-AP STA for being associated with the AP.
Access point class website, also referred to as wireless access points or focus etc..AP be mobile subscriber enter cable network access point, major deployments inside family, inside buildings and garden, typical covering radius be tens meters to rice up to a hundred, it is of course also possible to be deployed in open air.Equivalent to a connection wired network and the bridge of wireless network, its Main Function is to connect together each wireless network clients to AP, then by wireless network access network based on ethernet.Specifically, AP can be with WiFi (English：Wireless Fidelity, Chinese：Wireless Fidelity) chip terminal unit or the network equipment.Alternatively, AP can be for supporting the equipment of 802.11ax standards, still optionally further, and the AP can be the equipment of various WLAN standards such as support 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
Website (the English of non-access point class：None Access Point Station, referred to as：Non-AP STA), can be wireless communications chips, wireless senser or wireless communication terminal.For example：The mobile phone for supporting WiFi communication function, the panel computer for supporting WiFi communication function, the Set Top Box for supporting WiFi communication function, the intelligent television for supporting WiFi communication function, the intelligent wearable device for supporting WiFi communication function, the vehicular communication equipment for supporting WiFi communication function and the computer for supporting WiFi communication function.Alternatively, website can support 802.11ax standards, and still optionally further, the website supports various WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
Fig. 1 is the system schematic of a typical WLAN deployment scene, and including AP and 3 STA, AP is communicated with STA1, STA2 and STA3 respectively.
It is introduced in the wlan system 802.11ax after OFDMA technologies, AP can carry out downstream transmission from different STA on different running time-frequency resources.AP carries out downstream transmission and can adopt different patterns, such as OFDMA single user multiple-input and multiple-outputs (Single-User Multiple-Input Multiple-Output, abbreviation SU-MIMO) pattern, or OFDMA multi-user's multiple-input and multiple-output (Multi-User Multiple-Input Multiple-Output, abbreviation MU-MIMO).
Wherein, AP sends down physical layer protocol Data Unit (Physical Layer Protocol Data Unit, abbreviation PPDU) can to multiple websites or multiple site groups simultaneously.Here multiple websites can refer to the website under SU-MIMO patterns, and multiple site groups can refer to the site groups under MU-MIMO patterns.
Specifically, the PPDU that AP sends includes physical layer convergence protocol (Physical Layer Convergence Procedure, abbreviation PLCP) header field (Header) and data field, legacy preamble (L-Preamble) and efficient leading part is included in the PLCP Header, the efficient leading part includes efficient signaling A (High Efficient signaling A, abbreviation HE-SIGA) partly with efficient signaling B (High Efficient signaling B, abbreviation HE-SIGB) part.Media access control layer (Media Access Control, abbreviation MAC) part can also be included in the PPDU.
Embodiment 1
The embodiment of the present invention 1 provides a kind of method of state of transmission channel message, and the method can apply to website, for example：AP and STA1-STA3 in Fig. 1, the website can support next generation wlan standard, for example：802.11ax standard.Fig. 2 is the flow chart of the method for the state of transmission channel message, is comprised the following steps that：
Step 110：Empty packet NDP is generated, comprising efficient long training sequence HE-LTF and filling field in the Empty packet, the filling field is used for allowing targeted sites to have extra time receiving channel state information.
Step 120：Send the Empty packet.
It should be noted that PE (Chinese：Packet extended field, English：Packet Extension) effect in a data frame is to provide the extra time for website to carry out processing data, therefore the length of PE is related to the ability of website processing data.For example, for same group (bandwidth BW, spatial flow Nsts, modulation and coding strategy MCS), different websites may need the PE of different length；For same website, different (BW, Nsts, MCS) combination may need the PE of different length.That is, the length of PE is related to the ability of website processing data.For Frame, the possibility length of PE is 0us, 4us, 8us, 12us, 16us.For NDP, data division in NDP, is not included, website is calculating channel condition information using NDP.Therefore, if it is desirable to add PE after NDP, then the length of the PE of NDP needs additionally to carry out the negotiation of ability between website and access point, or prespecified by system.
Alternatively, the filling field includes being grouped extended field or extra HE-LTF.The Empty packet also includes the HE-LTF for carrying, and after HE-STF, for the channel estimation of targeted sites, specifically, the HE-LTF for carrying is the corresponding HE-LTF symbols of spatial stream number for needing to estimate to the HE-LTF that this carries.
It should be noted that the structure of the Empty packet comprising packet extended field is as shown in figure 3, the structure of the Empty packet comprising extra HE-LTF is as shown in Figure 4.
Alternatively, the length of packet extended field or the number of extra HE-LTF symbols are determined by following at least one condition：Bandwidth, the pattern of HE-LTF, the spatial stream number of estimation.
Specifically, the mode prespecified for system, can do advance regulation only in accordance with the number of spatial flow Nsts or HE-LTF symbol；Can also be only in accordance with the pattern of HE-LTF, that is 2x or 4x do advance regulation, and wherein 2x HE-LTF refer to the HE-LTF comprising 128 subcarriers, and 4x HE-LTF refer to the HE-LTF comprising 256 subcarriers, in former 11ac, the pattern of LTF is 1x, i.e., comprising 64 subcarriers；Advance regulation can also be done only in accordance with bandwidth BW；Advance regulation can also be done according to the combination in any of the Multiple factors such as spatial flow, HE-LTF patterns, bandwidth simultaneously.Certainly, system can not also be according to relevant parameter, the direct prespecified PE for adding one or more different length after NDP.
One example be according only to spatial flow Nsts number doing advance regulation, such as Nsts>4x the or 2x HE-LTF of n1, it is stipulated that add the PE of x1 after NDP；For Nsts<4x the or 2x HE-LTF of n2, it is stipulated that add the PE of x2 after NDP；Particularly, n1 can be 16us for 5, x1 for 4, n2, and x2 can be 8us.
Another example be according only to HE-LTF pattern doing advance regulation, such as 4x HE-LTF, it is stipulated that add the PE of x1 after NDP；For 2x HE-LTF, it is stipulated that add the PE of x2 after NDP；Particularly, x1 can be 16us, and x2 can be 8us.
Another example is doing advance regulation, such as Nsts according to the pattern of HE-LTF and the number of spatial flow Nsts>The 4x HE-LTF of n1, it is stipulated that add the PE of x1 after NDP；For Nsts<The 4x HE-LTF of n2, it is stipulated that add the PE of x2 after NDP；For Nsts>The 2x HE-LTF of n1, add the PE of x3 after NDP；For Nsts<The 2x HE-LTF of n2, add the PE of x4 after NDP；Particularly, n1 can be able to can be 16us for 5, x1 for 4, n2, and x2 can be 8us, and x3 can be 8us, and x4 can be 4us.
Another example is doing advance regulation, such as (BW according to the number of bandwidth BW and spatial flow Nsts>m1MHz,Nsts>N1 4x or 2x HE-LTF), it is stipulated that add the PE of x1 after NDP；For (BW<m2MHz,Nsts<N2 4x or 2x HE-LTF), it is stipulated that add the PE of x2 after NDP；For (BW>m1MHz,Nsts<N2 4x or 2x HE-LTF), it is stipulated that add the PE of x3 after NDP；For (BW<m2MHz,Nsts>N1 4x or 2x HE-LTF), it is stipulated that add the PE of x4 after NDP；
Another example is to do advance regulation not based on any parameter, for example, directly can specify to add the PE that a segment length is x1 after NDP.
Specifically, for the mode for carrying out capability negotiation between website and access point, the ability for preparing channel condition information can be reported access point together with the ability of processing data by website, it is also possible to specially report the ability for oneself preparing channel condition information.
One example is, for different (BW, Nsts) combine, two thresholdings (threshold_x1 and threshold_x2) defined in HE Capability domains, threshold_x1 is used for determining when maximum PE length is x1us, and threshold_x2 is used for decision, and when maximum PE length is x2us.Maximum PE is referred under maximum supported spatial flow, the length of the PE of needs.To each thresholding, can be indicated with 1 bit respectively.Specifically, when this 1 bit is the first value, being expressed as current threshold will not be used, and when this 1 bit is second value, represent that current threshold can be used.Illustrate, if this dibit is the first value, illustrate PE is not needed for the HE-LTF of 2x or 4x, or, the PE of the maximum for needing is little than x1us and x2us.If this dibit is second value, the HE-LTF for 2x is illustrated, maximum PE length is x1us；For the HE-LTF of 4x, maximum PE length is x2us；If 1 bit of correspondence threshold_x2 is the first value, 1 bit of correspondence threshold_x1 is second value, then illustrate the no matter HE-LTF of 2x or 4x, and the PE length of maximum is x1us；If 1 bit of correspondence threshold_x2 is second value, 1 bit of correspondence threshold_x1 is the first value, then illustrate the no matter HE-LTF of 2x or 4x, and the PE length of maximum is x2us.
Or,
To each thresholding, can be indicated with 2 bits respectively, 2 bits correspondence, 4 values.Specifically, when this 2 bit is the first value, represent that PE can reach current threshold under 2x HE-LTF patterns and 4x HE-LTF patterns；When this 2 bit is second value, represent that PE can reach current threshold under 4x HE-LTF patterns；When this 2 bit is the 3rd value, represent empty or invalid.Illustrate, if the two 2 bits are the 3rd value, illustrate PE is not needed for the HE-LTF of 2x or 4x, or, it is only necessary to the PE less than x1us and x2us.If 2 bits of correspondence threshold_x2 are second value, 2 bits of correspondence threshold_x1 are the 3rd value, then illustrate under 4x HE-LTF patterns, and maximum PE length is x2us；Under 2x HE-LTF patterns, PE is not all needed, or, the PE of the maximum for needing is little than x1us and x2us.If 2 bits of correspondence threshold_x2 are the 3rd value, 2 bits of correspondence threshold_x1 are the first value, then illustrate under 2x and 4x HE-LTF patterns, and maximum PE length is x1us.
Another example is that website is locally defining multiple HE-LTF thresholdings according to the ability of oneself.
| x1μs | x2μs | x3μs | x4μs | x5μs | |
| 2x HE-LTF | n1 | n2 | n3 | n4 | n5 |
| 4x HE-LTF | m1 | m2 | m3 | m4 | m5 |
In above table, the first row represents the possibility length of PE, can be in x1～x5, or this 5 values as listed by form any one or some.First row represents the pattern of HE-LTF, comprising 2x and 4x HE-LTF.Content representation in form, the number of HE-LTF symbols.By taking n3 as an example, if that NDP transmission is 2x HE-LTF, when the number of HE-LTF symbols is more than (more than or equal to) n3, and during less than or equal to (less than) n4, need to add the PE of x3us for the website.As NDP may be intended for one group of website, therefore the PE for needing most to grow in taking all websites needs the PE of addition as current NDP.
Specifically, a specific example of above table is：
| 0μs | 4μs | 8μs | 12μs | 16μs | |
| 2x HE-LTF | 1 | 2 | 4 | 6 | 8 |
| 4x HE-LTF | 0 | 1 | 2 | 4 | 8 |
Particularly, for NDP, the PE (for Frame, PE up to 16us) of most long 16us may be not enough to provide website sufficient extra time to prepare channel condition information.Therefore NDP, PE of the design more than 16us, such as 32us, 48us etc. can be specifically designed for.
By taking above table as an example, website can define multiple HE-LTF thresholdings according to the ability of oneself, as follows：
| 4μs | 8μs | 16μs | 32μs | 48μs | |
| 2x HE-LTF | 1 | 2 | 4 | 6 | 8 |
| 4x HE-LTF | 0 | 1 | 2 | 4 | 8 |
Specifically, above table is explained, when the number of 2x HE-LTF symbols is that the PE length for adopting is for 32us more than (more than or equal to) 6, during less than or equal to (less than) 8.
Alternatively, the Empty packet includes indication field, and the indication field is located in efficient signaling field HE-SIG of the Empty packet, and the indication field is used for defining packet extended field information or extra HE-LTF information.
Alternatively, the packet extended field information includes：The length of packet extended field, or whether packet extended field is more than 16us.
Alternatively, it is described packet extended field information and the extra HE-LTF information indicating means at least include it is following any one：Extra bit in HE-SIG, reuses the modulating-coding collection MCS in HE-SIG, reuses the packet extension PE domains in HE-SIG.
It is main below to introduce the indicating means for being grouped extended field information.
Specifically, website PE length is informed using the packet extended field information in HE-SIG.Include 1 bit in HE-SIG, for indicating present frame whether comprising a PE more than 16us；If so, the PE domains or MCS domains in HE-SIG is then reused indicating the length of current PE.Another example is, it is contemplated that include 2 kinds of untapped combinations in the PE domains of current 3 bit, it is therefore possible to use 2 kinds of untapped combinations include a PE more than 16us indicating present frame.2 kinds of untapped combinations, can also represent specific PE length respectively, and the such as untapped combination of one of which represents the PE comprising a 32us；Another kind of untapped combination represents the PE comprising a 48us.
Alternatively, alternatively, the extra HE-LTF information includes：The number of extra HE-LTF symbols, or with the presence or absence of extra HE-LTF.
It should be noted that the instruction of extra HE-LTF information can be determined by negotiation between website, or specified by standard.
Further, according to the summation of the extra HE-LTF and HE-LTF for carrying selecting the P matrixes of HE-LTF in the Empty packet.
Alternatively, HE-LTF extra in the Empty packet is identical with the HE-LTF parts for carrying, or, in the Empty packet, extra HE-LTF is all identical with the HE-LTF for carrying.
Alternatively, it is described packet extended field information and the extra HE-LTF information indicating means at least include it is following any one：Extra bit in HE-SIG, reuses the modulating-coding collection MCS in HE-SIG, reuses the packet extension PE domains in HE-SIG.
The indicating means of extra HE-LTF information is introduced below mainly.
Specifically, using HE-SIG in extra HE-LTF information inform website with the presence or absence of extra HE-LTF, or the number of extra HE-LTF symbols.
Exemplarily, the number of extra in NDP HE-LTF symbols is n1, and the number of the HE-LTF symbols for being carried in NDP in itself is n1+n2 for the number of HE-LTF symbols total in n2, therefore NDP.A kind of mode, selects the P matrixes of HE-LTF in the Empty packet according to summation n1+n2 of the extra HE-LTF and HE-LTF of reality；Another way, serves as extra HE-LTF by n1 HE-LTF is replicated in n2 HE-LTF.The website weak for some disposal abilities, the number of the HE-LTF symbols that can be carried merely with itself carry out the estimation of channel；And the website strong for some disposal abilities, the accuracy of channel estimation can be lifted simultaneously using extra HE-LTF.
How many extra HE-LTF symbols are specifically needed in NDP, need to carry out the negotiation of ability between website and access point, or it is prespecified by system.As NDP may be intended for one group of website, therefore the number of most extra HE-LTF symbols is needed in taking all websites as the number of the extra HE-LTF symbols of current NDP needs additions.
The implementation method of the number of the first extra HE-LTF symbol of instruction is to include indication bit in HE-SIG (HE-SIG-A or HE-SIG-B or both have), and the indication bit indicates the number of current extra HE-LTF symbols.
Receiving terminal is read in HE-SIG behind the domain of the number of extra HE-LTF symbols, it is known that the number of total HE-LTF symbols that present frame is included, and then it is known that the end position of present frame.And the number of the HE-LTF symbols for carrying in itself is determined by the spatial stream number that Nsts in HE-SIGA is indicated.
Or, the indication bit indicates whether present frame includes extra HE-LTF, or indicates whether present frame is NDP.For this instruction, in addition it is also necessary to inform the number of the extra HE-LTF symbols of website.The mode informed can reuse the part domain in HE-SIG, such as PE domains, MCS domains etc..Present frame can also be carried out indicate simultaneously in reusing HE-SIG by way of the domain of part whether comprising extra HE-LTF, or indicate that whether present frame is NDP and the extra number of HE-LTF symbols.
One example for reusing part domain in HE-SIG, it is contemplated that include 2 kinds of untapped combinations in the PE domains of current 3 bit, it is therefore possible to use 2 kinds of untapped combinations are indicating present frame comprising extra HE-LTF, or present frame is NDP.2 kinds of untapped combinations, can also represent that the number of extra HE-LTF symbols is m1 and m2 respectively (access point and website are made an appointment).Or, representing present frame only by the untapped combination of a certain kind includes extra HE-LTF, or present frame is NDP, then reuses MCS domains to indicate the number of extra HE-LTF symbols.
After receiving terminal reads the HE-SIG of said structure, by the domain that reuses or extra instruction, it is known that present frame is special frame (comprising extra HE-LTF, or present frame is NDP).Then pass through the domain of reuse, it is known that the number of the extra HE-LTF symbols that present frame is included, with reference to the number of HE-LTF symbols, it is possible to know the number of total HE-LTF symbols that present frame is included, and then it is known that the end position of present frame.The number of HE-LTF symbols is determined by the spatial flow that Nsts in HE-SIGA is indicated.
The implementation method of the number for indicating extra HE-LTF symbols second is to add 1 extra bit in the Nsts domains of HE-SIGA, for indicating the situation of more spatial flows.For example, current Nsts only includes 3 bits, supports to indicate maximum 8 spatial flows.By adding 1 extra bit, the Nsts of 4 bits can indicate the situation of most 16 spatial flows.Spatial flow corresponds to the number of HE-LTF symbols, the summation of the number of the number and extra HE-LTF symbols of the Nsts domains correspondence HE-LTF symbols after extension.In order to tell the number of the extra HE-LTF symbols of receiving terminal, extra bit can be added in HE-SIG, or reuse the part domain of HE-SIG, such as PE domains, MCS domains, carry the instruction of the number of extra HE-LTF symbols.Or, for NDP, for the number of different HE-LTF symbols, arranging the number of the extra HE-LTF symbols of different (access point and website are made an appointment), such as number of HE-LTF symbols is 4, then agreement has 2 extra HE-LTF symbols；The number of the HE-LTF symbols for carrying is 8, then agreement has 4 extra HE-LTF etc..It should be noted that telling the number of the extra HE-LTF symbols of receiving terminal, substantially it is consistent with the number for telling receiving terminal real space stream or HE-LTF symbols.Accordingly it is also possible to reuse the part domain of HE-SIG, such as PE domains, MCS domains carry the instruction of the number of spatial flow or the HE-LTF symbols for carrying.
After receiving terminal reads the HE-SIGA of said structure, can be known currently for NDP by the OFDM symbol for calculating data division, then pass through the number of the instruction for being reused domain or the extra HE-LTF symbols made an appointment, the number of extra HE-LTF symbols is deducted in the number of the HE-LTF symbols indicated from Nsts, you can obtain the number of HE-LTF symbols.And the number of the HE-LTF symbols for indicating to be known that currently total from Nsts, and then the it is known that end position of present frame.
The embodiment of the present invention is by generating Empty packet NDP, comprising the HE-LTF and packet extended field for being used for allowing target STA to carry out channel estimation in the Empty packet, or, comprising the HE-LTF and extra HE-LTF for being used for allowing target STA to carry out channel estimation in the Empty packet, can so avoid part website from not supporting the wasting of resources caused when feeding back immediately, and then the efficiency of transmission of channel condition information can be improved.
Embodiment 2
Fig. 5 be the embodiment of the present invention 2 WLAN in state of transmission channel message device schematic block diagram.The data transmission device is, for example, website, or realizes the special circuit or chip of correlation function.The website 1000 includes processor 1010, memorizer 1020, baseband circuit 1030, radio circuit 1040 and antenna 1050.The device of the transmission trigger frame can be the AP that illustrates in Fig. 1 or STA1-STA3.
Specifically, processor 1010 controls the operation of website 1000.Memorizer 1020 can include read only memory and random access memory, and to 1010 provide instruction and data of processor, processor can be general processor, digital signal processor, special IC, field programmable gate array or other PLDs.The a part of of memorizer 1020 can also include non-volatile row random access memory (NVRAM).Baseband circuit 1030 is that for synthesizing the baseband signal that will launch, or the baseband signal to receiving is decoded.Radio circuit 1040 is for the carrier signal of the carrier signal of the modulates baseband signals of low frequency to high frequency, high frequency is launched by antenna 1050.Radio circuit is also used for the high-frequency signal that antenna 1050 is received is demodulated to the carrier signal of low frequency.Each component of website 1000 is coupled by bus 1060, wherein bus system 1060 except including in addition to data/address bus, also including power bus, controlling bus and status signal bus in addition.But for the sake of for clear explanation, various buses are all designated as into bus system 1060 in figure.It should be noted that it is above-mentioned for the description of site structure, can be applicable to follow-up embodiment.
Baseband circuit 1030, generates Empty packet NDP, and comprising efficient long training sequence HE-LTF and filling field in the Empty packet, the filling field is used for allowing targeted sites to have extra time receiving channel state information；
Radio circuit 1040, for sending the Empty packet.
Alternatively, the filling field includes being grouped extended field or extra HE-LTF.
Alternatively, the length of packet extended field or the number of extra HE-LTF symbols are determined by following at least one condition：Bandwidth, the pattern of HE-LTF, the spatial stream number of estimation.
It should be noted that the number of the length of packet extended field or extra HE-LTF symbols can be determined by negotiation between website, it is also possible to defined by standard.
Alternatively, the Empty packet includes indication field, and the indication field is located in efficient signaling field HE-SIG of the Empty packet, and the indication field is used for defining packet extended field information and extra HE-LTF information.
Alternatively, the packet extended field information includes：The length of packet extended field, or whether packet extended field is more than 16us.
It should be noted that the definition of the packet extended field information is existing in embodiment 1 explaining in detail, repeat no more.
Alternatively, the extra HE-LTF information includes：The number of extra HE-LTF symbols, or with the presence or absence of extra HE-LTF.
Alternatively, according to the summation of the extra HE-LTF and HE-LTF for carrying selecting the P matrixes of HE-LTF in the Empty packet.
Alternatively, HE-LTF extra in the Empty packet is identical with the HE-LTF parts for carrying.
Alternatively, HE-LTF extra in the Empty packet is all identical with the HE-LTF for carrying.
It should be noted that the process existing explaination in detail in embodiment 1 how extra HE-LTF obtains, repeats no more.
Alternatively, it is described packet extended field information and the extra HE-LTF information indicating means at least include it is following any one：Extra bit in HE-SIG, reuses the modulating-coding collection MCS in HE-SIG, reuses the packet extension PE domains in HE-SIG.
The embodiment of the present invention is by generating Empty packet NDP, comprising the HE-LTF and packet extended field for being used for allowing target STA to carry out channel estimation in the Empty packet, or, comprising the HE-LTF and extra HE-LTF for being used for allowing target STA to carry out channel estimation in the Empty packet, can so avoid part website from not supporting the wasting of resources caused when feeding back immediately, and then the efficiency of transmission of channel condition information can be improved.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but the former is more preferably embodiment in many cases.Based on such understanding, the part that technical scheme is substantially contributed to prior art in other words can be embodied in the form of software product, the computer software product is stored in the storage medium that can read, such as the floppy disk of computer, hard disk or CD etc., use including some instructions so that a computer equipment (can be personal computer, server, or network equipment etc.) performs the method described in each embodiment of the invention.
Claims (20)
1. a kind of method of transmitting channel state information, it is characterised in that include：
Empty packet NDP is generated, efficient long training sequence HE-LTF in the Empty packet, is included
With filling field, the filling field is used for allowing targeted sites to have extra time to receive channel status letter
Breath；
Send the Empty packet.
2. the method for claim 1, the filling field include being grouped extended field or extra
HE-LTF.
3. method as claimed in claim 2, the length or extra of the packet extended field
The number of HE-LTF symbols is determined by following at least one condition：Bandwidth, the pattern of HE-LTF, estimates
The spatial stream number of meter.
4. method as claimed in claim 2, it is characterised in that the Empty packet is comprising indicating
Field, the indication field are located in efficient signaling field HE-SIG of the Empty packet, described
Indication field is used for defining packet extended field information or extra HE-LTF information.
5. method as claimed in claim 4, it is characterised in that the packet extended field packet
Include：The length of packet extended field, or whether packet extended field is more than 16us.
6. method as claimed in claim 4, it is characterised in that the extra HE-LTF packets
Include：The number of extra HE-LTF symbols, or with the presence or absence of extra HE-LTF.
7. method as claimed in claim 6, it is characterised in that according to extra HE-LTF with from
The summation of the HE-LTF of band is selecting the P matrixes of HE-LTF in the Empty packet.
8. method as claimed in claim 7, it is characterised in that extra in the Empty packet
HE-LTF is identical with the HE-LTF parts for carrying.
9. method as claimed in claim 7, it is characterised in that extra in the Empty packet
HE-LTF is all identical with the HE-LTF for carrying.
10. method as claimed in claim 4, the packet extended field information and described extra
The indicating means of HE-LTF information at least include it is following any one：Extra bit in HE-SIG, weight
With the modulating-coding collection MCS in HE-SIG, the packet extension PE domains in HE-SIG are reused.
11. a kind of devices of transmitting channel state information, it is characterised in that include：
Baseband circuit, generates Empty packet NDP, comprising efficiently long training in the Empty packet
Sequence HE-LTF and filling field, the filling field are used for allowing targeted sites to have the extra time to receive
Channel condition information；
Radio circuit, for sending the Empty packet.
12. devices as claimed in claim 11, the filling field include being grouped extended field or volume
Outer HE-LTF.
13. devices as claimed in claim 12, the length or extra of the packet extended field
The number of HE-LTF symbols is determined by following at least one condition：Bandwidth, the pattern of HE-LTF, estimates
The spatial stream number of meter.
14. devices as claimed in claim 12, it is characterised in that the Empty packet includes finger
Show field, the indication field is located in efficient signaling field HE-SIG of the Empty packet, institute
Indication field is stated for defining packet extended field information or extra HE-LTF information.
15. devices as claimed in claim 14, it is characterised in that the packet extended field information
Including：The length of packet extended field, or whether packet extended field is more than 16us.
16. devices as claimed in claim 14, it is characterised in that the extra HE-LTF information
Including：The number of extra HE-LTF symbols, or with the presence or absence of extra HE-LTF.
17. devices as claimed in claim 16, it is characterised in that according to extra HE-LTF with
The summation of the HE-LTF for carrying is selecting the P matrixes of HE-LTF in the Empty packet.
18. devices as claimed in claim 17, it is characterised in that extra in the Empty packet
HE-LTF it is identical with the HE-LTF parts for carrying.
19. devices as claimed in claim 17, it is characterised in that extra in the Empty packet
HE-LTF it is all identical with the HE-LTF for carrying.
20. devices as claimed in claim 14, the packet extended field information and described extra
The indicating means of HE-LTF information at least include it is following any one：Extra bit in HE-SIG, weight
With the modulating-coding collection MCS in HE-SIG, the packet extension PE domains in HE-SIG are reused.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510574968.XA CN106533522B (en) | 2015-09-10 | 2015-09-10 | Method and device for transmitting channel state information |
| PCT/CN2016/090777 WO2017041590A1 (en) | 2015-09-10 | 2016-07-20 | Method and device for transmitting channel state information |
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| CN201510574968.XA CN106533522B (en) | 2015-09-10 | 2015-09-10 | Method and device for transmitting channel state information |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019042210A1 (en) * | 2017-08-31 | 2019-03-07 | 华为技术有限公司 | Midamble indication and receiving method and apparatus |
| WO2020071999A1 (en) * | 2018-10-01 | 2020-04-09 | Panasonic Intellectual Property Corporation Of America | Communication apparatus and communication method for channel estimation |
| CN115865571A (en) * | 2020-06-05 | 2023-03-28 | 华为技术有限公司 | PPDU transmission method and related device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022008068A1 (en) * | 2020-07-10 | 2022-01-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Measurement signals for sensing |
| US11431389B1 (en) | 2021-07-10 | 2022-08-30 | Nxp Usa, Inc. | System and method for enabling beamforming in wireless networks |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102396186A (en) * | 2009-04-13 | 2012-03-28 | 马维尔国际贸易有限公司 | Physical layer frame format for wlan |
| CN103181135A (en) * | 2010-08-04 | 2013-06-26 | 高通股份有限公司 | Vht-sig-b field in null data packets (ndps) |
| US20140211775A1 (en) * | 2013-01-28 | 2014-07-31 | Qualcomm Incorporated | Larger delay spread support for wifi bands |
| CN104253673A (en) * | 2013-06-25 | 2014-12-31 | 华为技术有限公司 | Uplink multi-user data transmission method and uplink multi-user input output system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9131399B2 (en) * | 2011-08-15 | 2015-09-08 | Marvell World Trade Ltd. | Control data unit format for WLAN |
| US9451590B2 (en) * | 2013-01-28 | 2016-09-20 | Qualcomm Incorporated | Extending range and delay spread in WiFi bands |
-
2015
- 2015-09-10 CN CN201510574968.XA patent/CN106533522B/en active Active
-
2016
- 2016-07-20 WO PCT/CN2016/090777 patent/WO2017041590A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102396186A (en) * | 2009-04-13 | 2012-03-28 | 马维尔国际贸易有限公司 | Physical layer frame format for wlan |
| CN103181135A (en) * | 2010-08-04 | 2013-06-26 | 高通股份有限公司 | Vht-sig-b field in null data packets (ndps) |
| US20140211775A1 (en) * | 2013-01-28 | 2014-07-31 | Qualcomm Incorporated | Larger delay spread support for wifi bands |
| CN104253673A (en) * | 2013-06-25 | 2014-12-31 | 华为技术有限公司 | Uplink multi-user data transmission method and uplink multi-user input output system |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019042210A1 (en) * | 2017-08-31 | 2019-03-07 | 华为技术有限公司 | Midamble indication and receiving method and apparatus |
| US11044132B2 (en) | 2017-08-31 | 2021-06-22 | Huawei Technologies Co., Ltd. | Midamble indication and receiving methods and apparatuses |
| US11451423B2 (en) | 2017-08-31 | 2022-09-20 | Huawei Technologies Co., Ltd. | Midamble indication and receiving methods and apparatuses |
| WO2020071999A1 (en) * | 2018-10-01 | 2020-04-09 | Panasonic Intellectual Property Corporation Of America | Communication apparatus and communication method for channel estimation |
| CN112715047A (en) * | 2018-10-01 | 2021-04-27 | 松下电器（美国）知识产权公司 | Communication apparatus and communication method for channel estimation |
| EP3861811A4 (en) * | 2018-10-01 | 2021-11-17 | Panasonic Intellectual Property Corporation of America | Communication apparatus and communication method for channel estimation |
| US11588521B2 (en) | 2018-10-01 | 2023-02-21 | Panasonic Intellectual Property Corporation Of America | Communication apparatus and communication method for channel estimation |
| US11894893B2 (en) | 2018-10-01 | 2024-02-06 | Panasonic Intellectual Property Corporation Of America | Communication apparatus and communication method for channel estimation |
| CN115865571A (en) * | 2020-06-05 | 2023-03-28 | 华为技术有限公司 | PPDU transmission method and related device |
| CN116418457A (en) * | 2020-06-05 | 2023-07-11 | 华为技术有限公司 | Transmission method of PPDU and related device |
| CN115865571B (en) * | 2020-06-05 | 2024-01-05 | 华为技术有限公司 | Transmission method of PPDU and related device |
| CN116418457B (en) * | 2020-06-05 | 2024-02-13 | 华为技术有限公司 | Transmission method of PPDU and related device |
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| Publication number | Publication date |
|---|---|
| WO2017041590A1 (en) | 2017-03-16 |
| CN106533522B (en) | 2020-10-09 |
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