CN103378893A - Method and device for transmitting open-loop data - Google Patents
Method and device for transmitting open-loop data Download PDFInfo
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Abstract
The invention discloses a method and device for transmitting open-loop data. The method includes the steps that a transmitting end acquires space-time fluxion and a space mapping matrix needed by space mapping from the local place, wherein the space-time fluxion is determined according to preset space-time fluxion or determined by modifying channel information fed back by a receiving end according to a preset rule; the sending end carries out space mapping on data to be transmitted according to the acquired space-time fluxion and the acquired space mapping matrix; the sending end carries out sending processing on the data to be transmitted, wherein the data to be transmitted has been subjected to space mapping. According to the technical scheme, the problem that a large number of interaction signals and physical resources are occupied because the receiving end feeds back the channel information in an MIMO system in related technologies is solved, therefore, waste of the interaction signals and the physical resources is reduced, and performance gains of the MIMO system are improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method and device of open loop data transmission.
Background technology
The typical application scenarios of IEEE 802.11ah system is that Internet of Things is used the coverage enhancement of medical monitoring or 1GHz.For the Internet of Things application scenarios, these professional characteristics are terminal long-time sleeping, only need report in a certain time interval required information, each about 250byte of information that sends, and majority is the small data business packet.
IEEE 802.11ah system supports closed loop multiple-input and multiple-output (Multiple Input Multiple Output, referred to as MIMO) sending method, the transmitting terminal channel information is measured frame, receiving terminal carries out channel measurement and feedback of channel information, according to 41 antenna configurations of receiving, the channel information of required feedback will reach 300byte, taken the more physical resource of system, and the process of feedback of channel information also can increase the information interactive process of internet-of-things terminal, takies the physical resource of system.
For the problems referred to above in the correlation technique, effective solution is proposed not yet at present.
Summary of the invention
In correlation technique, in mimo system, because the receiving terminal feedback channel message takies the problems such as more mutual signaling and physical resource, the invention provides method and device that a kind of open loop data sends, to address the above problem at least.
According to an aspect of the present invention, the method that provides a kind of open loop data to send, comprise: transmitting terminal obtains fluxion and spatial mappings matrix when carrying out the needed sky of spatial mappings from this locality, wherein, described when empty fluxion determine by one of following mode: according to set in advance empty the time fluxion definite; Revise the channel information of receiving terminal feedback determines according to pre-defined rule; Transmitting terminal according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings; Transmitting terminal carries out transmission processing to the data described to be sent of carrying out after the spatial mappings.
Above-mentioned transmitting terminal according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings, comprise: transmitting terminal according to obtain described empty the time fluxion according to default mapping ruler, determine the space fluxion of the described data to be sent of transmission; Transmitting terminal carries out spatial mappings according to the described space fluxion of determining to described data to be sent.
Above-mentioned default mapping ruler comprise following one of at least: the spatial flow of described transmitting terminal several during according to described set in advance empty fluxion shine upon according to the table 20-11 among the IEEE 802.11～2009; Described transmitting terminal will receive described spatial flow corresponding to fluxion when empty, repeating mapping are described transmitting terminal stream when sending required empty of described data to be sent.
Above-mentioned transmitting terminal according to default mapping ruler according to determine described empty the time fluxion before, also comprise: transmitting terminal and receiving terminal are when the areas of capacity information interaction, and the information of mutual open loop tenability wherein, carries the indication of open loop ability in the described areas of capacity information.
Above-mentioned transmitting terminal carries out transmission processing to the data described to be sent of carrying out after the spatial mappings, comprising: transmitting terminal carries out according to described space fluxion that cyclic shift diversity is processed and the space-time block code processing, and the data described to be sent after the transmission processing.
Fluxion when above-mentioned channel information is empty, described pre-defined rule comprises: fluxion is by one of following mode value during this sky: the smaller value of the reception antenna number of the antenna number of described transmitting terminal, described receiving terminal, described transmitting terminal antenna number and described receiving terminal antenna number.
Above-mentioned transmitting terminal according to obtain empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings, comprising: described transmitting terminal is chosen from predefined mapping matrix set and is carried out the needed spatial mappings matrix of spatial mappings; Transmitting terminal according to obtain empty the time fluxion and the described spatial mappings matrix chosen described data to be sent are carried out spatial mappings.
Fluxion is one of following during above-mentioned set in advance empty: 1,2,3,4.
According to a further aspect of the invention, the device that provides a kind of open loop data to send, be positioned at transmitting terminal, comprise: acquisition module, be used for obtaining from this locality and carry out spatial mappings needed fluxion and spatial mappings matrix when empty, wherein, described when empty fluxion determine by one of following mode: according to set in advance empty the time fluxion definite; Revise the channel information of receiving terminal feedback determines according to pre-defined rule; Mapping block, be used for according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings; Sending module is used for the data described to be sent of carrying out after the spatial mappings are carried out transmission processing.
Above-mentioned mapping block comprises: determining unit, be used for according to obtain described empty the time fluxion according to default mapping ruler, determine the space fluxion of the described data to be sent of transmission; Map unit is used for according to the described space fluxion of determining described data to be sent being carried out spatial mappings.
Above-mentioned default mapping ruler comprise following one of at least: the spatial flow of transmitting terminal several during according to described set in advance empty fluxion shine upon according to the table 20-11 among the IEEE 802.11～2009; Transmitting terminal will receive described spatial flow corresponding to fluxion when empty, repeating mapping are described transmitting terminal stream when sending required empty of described data to be sent.
Fluxion when above-mentioned channel information is empty, described pre-defined rule comprises: fluxion is by one of following mode value during this sky: the smaller value of the reception antenna number of the antenna number of described transmitting terminal, described receiving terminal, described transmitting terminal antenna number and described receiving terminal antenna number.
By the present invention, adopt according to set in advance empty the time fluxion or the technological means of fluxion when fluxion is determined transmitting terminal empty when revising receiving terminal feedback empty according to pre-defined rule, solved in the correlation technique, in mimo system, because the receiving terminal feedback channel message takies the problems such as more mutual signaling and physical resource, thereby reduced the waste of Signalling exchange and physical resource, improved the MIMO performance gain.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the method for the open loop data transmission of the embodiment of the invention;
Fig. 2 is the IEEE 802.11ah physical layer process process schematic diagram according to correlation technique;
Fig. 3 is the structured flowchart according to the device of the open loop data transmission of the embodiment of the invention;
Fig. 4 is the structural representation according to the device of the open loop transmission of the embodiment of the invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Consider in the correlation technique that in mimo system, exist because the receiving terminal feedback channel message takies the problems such as more operation resource and physical resource, the embodiment of the invention mainly solves above-mentioned technical problem from two aspects.
Embodiment 1
Fig. 1 is the flow chart according to the method for the open loop transmission of the embodiment of the invention 1.As shown in Figure 1, the method comprises:
Step S102, transmitting terminal obtain from this locality and carry out spatial mappings needed fluxion and spatial mappings matrix when empty, wherein, described when empty fluxion determine by one of following mode: according to set in advance empty the time fluxion definite; Revise the space fluxion of receiving terminal feedback determines according to pre-defined rule;
Step S104, transmitting terminal according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings;
Step S106, transmitting terminal carries out transmission processing to the data to be sent of carrying out after the spatial mappings.
By above-mentioned processing procedure, since transmitting terminal be according to set in advance empty the time fluxion obtain needed fluxion when empty, be not to obtain according to receiving terminal feedack (for example channel information), namely saved the step of above-mentioned receiving terminal feedback information, therefore, fundamentally take the technical problem of more Signalling exchange and physical resource owing to the receiving terminal feedback channel message, perhaps, fluxion determined that transmitting terminal carries out needed fluxion when empty of spatial mappings when transmitting terminal can also be revised receiving terminal feedback empty according to pre-defined rule, like this, based on this modification process, feedback cycle can be elongated (number of times and the frequency that namely reduce the terminal feedback channel information), can reduce equally the waste of Signalling exchange and physical resource.
Transmitting terminal according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings, specifically can comprise following processing procedure: transmitting terminal according to obtain described empty the time fluxion according to default mapping ruler, determine the space fluxion of the described data to be sent of transmission; Transmitting terminal carries out spatial mappings according to the described space fluxion of determining to described data to be sent.
It is one of following that above-mentioned default mapping ruler comprises: the spatial flow of (1) transmitting terminal several during according to described set in advance empty fluxion shine upon according to the table 20-11 among the IEEE 802.11～2009; (2) transmitting terminal will receive described empty the time spatial flow corresponding to fluxion, repeating mapping is described transmitting terminal stream when sending required empty of described data to be sent.Wherein, for above-mentioned default mapping ruler (1) can be used for according to set in advance empty the time fluxion determine that current transmitting terminal carries out the needed situation of fluxion when empty of spatial mappings; The situation of fluxion when above-mentioned default mapping ruler (2) can determine that current transmitting terminal carries out the needed sky of spatial mappings for the channel information of revising the receiving terminal feedback according to pre-defined rule.
Because above-mentioned default mapping ruler is different with correlation technique, therefore, in the specific implementation, need to notify the other side ability separately, can realize by following processing procedure particularly: transmitting terminal according to default mapping ruler according to determine described empty the time fluxion before, transmitting terminal and receiving terminal when the areas of capacity information interaction, the information of mutual open loop tenability (for example open loop multiple-input and multiple-output), wherein, carry the indication of open loop ability in the described areas of capacity information.This open loop ability indication can be used to indicate the other side's mapping ruler.
The cyclic shift diversity of IEEE 802.11n and IEEE 802.11ac system (Cyclic Shift Diversity, referred to as CSD), space-time block code (Space Time Block Code, referred to as STBC) etc. the MIMO processing procedure when all being based on sky stream carry out, as shown in Figure 2.And for internet-of-things terminal, in order to save manufacturing cost, often disposing single antenna, corresponding spatial flow just equals 1, can not carry out transmission processing (comprise when being not limited to CSD or STBC and processing), can reduce the performance gain of internet-of-things terminal.Adopt above-mentioned processing mode, clearly can carry out transmission processing to data to be sent.Being above-mentioned transmitting terminal carries out transmission processing to the data described to be sent of carrying out after the spatial mappings, comprising: described transmitting terminal carries out according to described space fluxion that cyclic shift diversity is processed and the space-time block code processing, and the data described to be sent after the transmission processing.
Fluxion when above-mentioned channel information can be for sky, in this case, above-mentioned pre-defined rule is: described when empty fluxion for by one of following mode value: the smaller value of the reception antenna number of the antenna number of described transmitting terminal, described receiving terminal, described transmitting terminal antenna number and described receiving terminal antenna number.Wherein, for the situation of carrying out value according to the antenna number of transmitting terminal: at website (transmitting terminal) configuration 2 antennas, then no matter during terminal (receiving terminal) feedback empty fluxion why be worth, when sending, fluxion is number of transmit antennas when making sky all the time, and fluxion is constantly equal to 2 when namely empty.For the situation of carrying out value according to the reception antenna number of receiving terminal, similar with the situation of above-mentioned antenna number according to transmitting terminal, repeat no more herein.
The obtain manner of above-mentioned spatial mappings matrix has multiple, for example can choose from the predefined mapping matrix set of transmitting terminal and carry out the needed spatial mappings matrix of spatial mappings; In such cases, transmitting terminal according to obtain empty the time fluxion and the described spatial mappings matrix chosen described data to be sent are carried out spatial mappings.Mapping matrix is when for example setting sky when two antennas
Fluxion can be for one of following during above-mentioned set in advance empty: 1,2,3,4.
The device that also provides in the present embodiment a kind of open loop data to send is positioned at transmitting terminal, is used for realizing above-described embodiment and preferred implementation, has carried out repeating no more of explanation, and the below describes relating to module in this device.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described device of following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also may and be conceived.Fig. 3 is the structured flowchart according to the device of the open loop data transmission of the embodiment of the invention 1.As shown in Figure 3, this device comprises:
In a preferred embodiment of the present invention, as shown in Figure 4, above-mentioned mapping block 32, comprise: determining unit 320, be connected to map unit 322, be used for according to obtain described empty the time fluxion according to default mapping ruler, determine the space fluxion of the described data to be sent of transmission; Map unit 322 is used for according to the described space fluxion of determining described data to be sent being carried out spatial mappings.
Above-mentioned default mapping ruler comprise following one of at least: the spatial flow of (1) transmitting terminal several during according to described set in advance empty fluxion shine upon according to the table 20-11 among the IEEE 802.11～2009; (2) transmitting terminal will receive described empty the time spatial flow corresponding to fluxion, repeating mapping is described transmitting terminal stream when sending required empty of described data to be sent.
In the present embodiment, fluxion when above-mentioned channel information can be for sky, in such cases, above-mentioned pre-defined rule comprises: fluxion is by one of following mode value during this sky: the smaller value of the reception antenna number of the antenna number of described transmitting terminal, described receiving terminal, described transmitting terminal antenna number and described receiving terminal antenna number.
Need to prove that the preferred implementation of each module can referring to the description of said method embodiment, repeat no more among the said apparatus embodiment herein.
In order to understand better above-described embodiment, describe in detail below in conjunction with specific embodiment and relevant drawings: following execution mode is based on MU-MIMO (multi-user-multiple-input, multiple-output) technology, and a website can send data to a plurality of websites simultaneously; Simultaneously, a plurality of websites also can send data to a website simultaneously.Need to prove, in following examples, website (Station is referred to as STA) fluxion in the time of can feeding back sky all the time, but can the feedback channel information matrix under the open loop MIMO, perhaps adjust (modifications) former feedback information and carry out this transmission.
Embodiment 1
As access point (Access Point, referred to as AP) 2～4 antennas of (being equivalent to transmitting terminal) configuration, during 1 antenna of STA (being equivalent to receiving terminal) configuration, at this moment, although to be 1, AP end process Nsts=2 in the transmission of this STA when empty (be predefined fluxion) according to preseting fluxion Nsts during STA feedback empty.The spatial flow of transmitting terminal several according to predefined when empty fluxion determine, still shine upon according to the table 20-11 in the standard IEEE 802.11～2009.As shown in table 1: being specially AP is 1 with data to be sent according to spatial flow Nss, is mapped on 2 spatial flows by STBC.
Table 1
| Fluxion Nsts when empty | The STBC territory | Space fluxion Nss |
| 1 | Not 0 (not adopting STBC) | 1 |
| 2 | 1 (adopting STBC) | 1 |
| 2 | 0 | 2 |
| 4 | 1 | 2 |
| 3 | 0 | 3 |
| 4 | 1 | 3 |
| 4 | 0 | 4 |
This shows that the main design idea of present embodiment is: when many antennas send, transmitting terminal according to send fate or predefined when empty fluxion carry out spatial mappings, its spatial mappings matrix is chosen in pre-defined mapping matrix set; The spatial flow of transmitting terminal several according to predefined when empty fluxion determine, still shine upon according to the table 20-11 in the standard IEEE 802.11～2009; Fluxion is set as particular value when empty (set in advance fluxion) during transmission empty, and carries out CSD according to the number of spatial flow and process, and STBC and spatial mappings are processed.
Embodiment 2
When AP (access point) configuration 2,3,4 antennas, during 1 antenna of site configuration, at this moment, although the Nsts of STA feedback (fluxion during sky) is 1, AP holds the number of transmit antennas of Nsts=AP in the transmission that presets this STA, perhaps Nsts is set as the antenna number less than AP, perhaps greater than 1 arbitrary value, carries out transmission processing.Being specially AP is 1 with data to be sent according to the Nss spatial flow, forms four streams when empty after repeating, and mapping relations are as shown in table 2:
Table 2
| Space fluxion Nss | The STBC territory | Fluxion Nsts when empty |
| 1 | Not 0 (not adopting STBC) | 1 |
| 1 | 0 | 2 |
| 1 | 0 | 3 |
| 1 | 0 | 4 |
| 1 | 1 (adopting STBC) | 2 |
| 1 | 1 | 3 |
| 1 | 1 | 4 |
Wherein, when Nss is 1, when not adopting STBC, the space fluxion after mapping is 1,2,3 or 4 o'clock, and respectively a spatial flow being repeated first is 1,2,3 or 4 streams when empty, enters together next processing procedure.
Wherein, when Nss is 1, when adopting STBC, when the space fluxion after the mapping was 2, it was 2 streams when empty that spatial flow repeats first, after stream carries out the STBC coding when then empty with these two, entered next processing procedure.
Wherein, when Nss is 1, when adopting STBC, when the space fluxion after the mapping was 3, it was three streams when empty that spatial flow repeats first, and after stream carries out the STBC coding when then the first two is empty, and the 3rd stream enters next processing procedure together.Wherein, when Nss is 1, when adopting STBC, when the space fluxion after the mapping is 4, it is 4 streams when empty that spatial flow repeats first, and stream carries out the STBC coding when then the first two is empty, after stream carries out the STBC coding during latter two sky, 4 empty time streams enter next processing procedure together, and namely the spatial mappings of the CSD spatial mappings matrix processing or pre-define is processed.
Because stream and the mapping method of spatial flow are as shown in table 2 during this sky, the spatial flow that adopts with prior art and when empty the mapping method of stream different, therefore need to extra notification terminal, employing is the open loop MIMO repeating mapping in this transmission.Said method also comprises: the information of described transmitting terminal and the described receiving terminal mutual open loop multiple-input and multiple-output of needs MIMO tenability when the areas of capacity information interaction wherein, carries the indication of open loop MIMO ability in the described areas of capacity information.
Because the stream that is the spatial flow repeating mapping when empty that adopts in the present embodiment, need to be in the signaling message of physical frame, indicate this transmission to adopt the mapping method of spatial flow repeating mapping stream when empty to receiving terminal.
In sum, above-described embodiment has been realized following beneficial effect: the technical scheme that adopts the embodiment of the invention, strengthened the transmission of supporting open loop MIMO in the existing system, can reduce the MIMO feedback overhead, fluxion is set preferably systematic function can be provided when empty flexibly.
In another embodiment, also provide a kind of software, this software be used for to be carried out the technical scheme that above-described embodiment and preferred implementation are described.
In another embodiment, also provide a kind of storage medium, stored above-mentioned software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, 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 (12)
1. the method that open loop data sends is characterized in that, comprising:
Transmitting terminal obtains from this locality and carries out spatial mappings needed fluxion and spatial mappings matrix when empty, wherein, described when empty fluxion determine by one of following mode: according to set in advance empty the time fluxion definite; Revise the channel information of receiving terminal feedback determines according to pre-defined rule;
Described transmitting terminal according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings;
Described transmitting terminal carries out transmission processing to the data described to be sent of carrying out after the spatial mappings.
2. method according to claim 1 is characterized in that, described transmitting terminal according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings, comprising:
Described transmitting terminal according to obtain described empty the time fluxion according to default mapping ruler, determine the space fluxion of the described data to be sent of transmission;
Described transmitting terminal carries out spatial mappings according to the described space fluxion of determining to described data to be sent.
3. method according to claim 2 is characterized in that, described default mapping ruler comprise following one of at least:
The spatial flow of described transmitting terminal several during according to described set in advance empty fluxion shine upon according to the table 20-11 among the IEEE 802.11～2009;
Described transmitting terminal will receive described spatial flow corresponding to fluxion when empty, repeating mapping are described transmitting terminal stream when sending required empty of described data to be sent.
4. method according to claim 2, it is characterized in that, described transmitting terminal according to default mapping ruler according to determine described empty the time fluxion before, also comprise: described transmitting terminal and described receiving terminal are when the areas of capacity information interaction, the information of mutual open loop tenability, wherein, carry the indication of open loop ability in the described areas of capacity information.
5. method according to claim 2 is characterized in that, described transmitting terminal carries out transmission processing to the data described to be sent of carrying out after the spatial mappings, comprising:
Described transmitting terminal carries out the cyclic shift diversity processing according to described space fluxion and space-time block code is processed, and the data described to be sent after the transmission processing.
6. method according to claim 1, it is characterized in that, fluxion when described channel information is empty, described pre-defined rule comprises: fluxion is by one of following mode value during this sky: the smaller value of the reception antenna number of the antenna number of described transmitting terminal, described receiving terminal, described transmitting terminal antenna number and described receiving terminal antenna number.
7. method according to claim 1 is characterized in that, described transmitting terminal according to obtain empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings, comprising:
Described transmitting terminal is chosen from predefined mapping matrix set and is carried out the needed spatial mappings matrix of spatial mappings;
Described transmitting terminal according to obtain empty the time fluxion and the described spatial mappings matrix chosen described data to be sent are carried out spatial mappings.
8. according to claim 1 to 7 each described methods, it is characterized in that fluxion is one of following during described set in advance empty:
1、2、3、4。
9. the device that open loop data sends is positioned at transmitting terminal, it is characterized in that, comprising:
Acquisition module is used for obtaining from this locality and carries out spatial mappings needed fluxion and spatial mappings matrix when empty, wherein, described when empty fluxion determine by one of following mode: according to set in advance empty the time fluxion definite; Revise the channel information of receiving terminal feedback determines according to pre-defined rule;
Mapping block, be used for according to obtain described empty the time fluxion and described spatial mappings matrix data to be sent are carried out spatial mappings;
Sending module is used for the data described to be sent of carrying out after the spatial mappings are carried out transmission processing.
10. device according to claim 9 is characterized in that, described mapping block comprises:
Determining unit, be used for according to obtain described empty the time fluxion according to default mapping ruler, determine the space fluxion of the described data to be sent of transmission;
Map unit is used for according to the described space fluxion of determining described data to be sent being carried out spatial mappings.
11. device according to claim 10 is characterized in that, described default mapping ruler comprise following one of at least:
The spatial flow of described transmitting terminal several during according to described set in advance empty fluxion shine upon according to the table 20-11 among the IEEE 802.11～2009;
Described transmitting terminal will receive described spatial flow corresponding to fluxion when empty, repeating mapping are described transmitting terminal stream when sending required empty of described data to be sent.
12. device according to claim 9, it is characterized in that, fluxion when described channel information is empty, described pre-defined rule comprises: fluxion is by one of following mode value during this sky: the smaller value of the reception antenna number of the antenna number of described transmitting terminal, described receiving terminal, described transmitting terminal antenna number and described receiving terminal antenna number.
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| CN112491750A (en) * | 2019-09-12 | 2021-03-12 | 华为技术有限公司 | Method and apparatus for perceptual measurement |
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