CN105553524A - Method and device for acquiring downlink channel matrix of FDD system - Google Patents
Method and device for acquiring downlink channel matrix of FDD system Download PDFInfo
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- CN105553524A CN105553524A CN201510903437.0A CN201510903437A CN105553524A CN 105553524 A CN105553524 A CN 105553524A CN 201510903437 A CN201510903437 A CN 201510903437A CN 105553524 A CN105553524 A CN 105553524A
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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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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Abstract
Embodiments of the invention disclose a method and a device for acquiring the downlink channel matrix of an FDD system, and relate to the field of communication. With the method and the device, the downlink channel matrix of second UE in an FDD system can be acquired accurately, the PMI accurately measuring the current channel condition of a terminal can be acquired easily to transmit data, and the system performance is improved. According to the specific scheme, the method comprises the steps of reading the current uplink channel matrix of first UE in a time-division duplex TDD system which is deployed in the same station as the FDD system, and acquiring the downlink channel matrix of second UE in the FDD system according to the current uplink channel matrix. The method and the device of the invention are used for acquiring the downlink channel matrix of the FDD system.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of method and the device that obtain Frequency Division Duplexing (FDD) (FrequencyDivisionDuplexing is called for short FDD) system descending channel matrix.
Background technology
In order to improve system transfers performance, Long Term Evolution introduces precoding technique in (LongTermEvolution is called for short LTE).In the precoding process of FDDLTE, usual employing closed-loop feedback mechanism, end side obtains subscriber equipment (UserEquipment in FDD system by channel estimating, be called for short UE) down channel matrix, obtain the pre-coding matrix instruction (PrecodingMatrixIndicator that this down channel matrix is corresponding, be called for short PMI), to base station feedback PMI, realize the precoding transmitted to indicate base station.
But, in mobile communication system, the high-speed mobile of terminal makes to become (such as during channel circumstance, be in the terminal in high-iron carriage), and time become channel circumstance cause the channel estimating of terminal not in time, the down channel matrix obtained is inaccurate, and then causes the up PMI that feeds back can not the current channel status of accurate response; If base station adopts such PMI to select code book transmission data, the decline of systematic function will be caused.
Summary of the invention
Embodiments of the invention provide a kind of method and the device that obtain FDD system down channel matrix, realize the down channel matrix of UE in Obtaining Accurate FDD system, are convenient to obtain accurately weigh the current channel conditions PMI of terminal to transmit data, improve systematic function.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A first aspect of the present invention, provides a kind of method obtaining FDD system PMI, comprising:
Read the current up channel matrix of a UE in time division duplex (TimeDivisionDuplexing the is called for short TDD) system of disposing with described FDD system co-sited;
According to described current up channel matrix, obtain the down channel matrix of the 2nd UE in described FDD system; Wherein, a described UE and described 2nd UE frequency range difference are less than or equal to pre-determined threshold.
A second aspect of the present invention, provides a kind of device obtaining FDD system down channel matrix, comprising:
Reading unit, for reading the current up channel matrix of a UE in the TDD system of disposing with described FDD system co-sited;
Acquiring unit, for the described current up channel matrix read according to described reading unit, obtains the down channel matrix of the 2nd UE in described FDD system; Wherein, a described UE and described 2nd UE frequency range difference are less than or equal to pre-determined threshold.
The method of the acquisition FDD system down channel matrix that the embodiment of the present invention provides and device, the current up channel matrix of a UE in the TDD system of being disposed by reading and FDD system co-sited; According to described current up channel matrix, obtain the down channel matrix of the 2nd UE in described FDD system.Due to TDD up-downgoing channel symmetry, the therefore current up channel matrix of TDD system and down channel approximate matrix, and because the deployment of FDD and TDD co-sited, a UE and the 2nd UE frequency range close, therefore, a UE and the 2nd UE down channel approximate matrix; That is, the current up channel matrix of a UE in the TDD system of disposing with FDD system co-sited is adopted to obtain the down channel matrix of the 2nd UE in FDD system, the channel conditions of current FDD system can be reacted accurately, therefore, achieve the down channel matrix of the 2nd UE in Obtaining Accurate FDD system, be convenient to obtain and accurately weigh the current channel conditions PMI of terminal to transmit data, improve systematic function.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of apparatus structure schematic diagram obtaining FDD system down channel matrix that Fig. 1 provides for the embodiment of the present invention;
A kind of method flow schematic diagram obtaining FDD system down channel matrix that Fig. 2 provides for the embodiment of the present invention;
The apparatus structure schematic diagram of the another kind acquisition FDD system down channel matrix that Fig. 3 provides for the embodiment of the present invention;
The apparatus structure schematic diagram of another acquisition FDD system down channel matrix that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In addition, term " system " and " network " are often used interchangeably in this article herein.Term "and/or" herein, being only a kind of incidence relation describing affiliated partner, can there are three kinds of relations in expression, and such as, A and/or B, can represent: individualism A, exists A and B simultaneously, these three kinds of situations of individualism B.In addition, character "/" herein, general expression forward-backward correlation is to the relation liking a kind of "or".
In LTE system, the deployment of FDD system and TDD system co-sited, common mode makes FDD system and TDD system dispose frequency to be more or less the same, and therefore response characteristic also should reach unanimity frequently at that time, and the symmetry of TDD system up-downgoing channel.Based on this, general principle of the present invention is: the down channel matrix obtaining the 2nd UE in the FDD system of disposing with its co-sited according to the result (channel matrix) of the current uplink channel estimation of a UE in TDD system, draws the down channel matrix of the current channel conditions accurately weighing the 2nd UE in FDD system; Wherein, the frequency range of a UE and the 2nd UE is close, and its frequency range difference is less than or equal to pre-determined threshold.
Optionally, a UE is any one UE in TDD system; 2nd UE is any one UE in FDD system.
The method of the acquisition FDD system down channel matrix that the embodiment of the present invention provides can be performed by the device obtaining FDD system down channel matrix, and this device can be the part or all of of base station.
Shown in Fig. 1 is the structural representation of the device of the acquisition FDD system down channel matrix relevant to various embodiments of the present invention.As shown in Figure 1, the device 10 of this acquisition FDD system down channel matrix can comprise: processor 101, memory 102.
Concrete introduction is carried out below in conjunction with Fig. 1 each component parts to the device 10 obtaining FDD system down channel matrix:
Memory 102 can be volatile memory (volatilememory), such as random access memory (random-accessmemory, RAM); Or nonvolatile memory (non-volatilememory), such as read-only memory (read-onlymemory, ROM), flash memory (flashmemory), hard disk (harddiskdrive, or solid state hard disc (solid-statedrive, SSD) HDD); Or the combination of the memory of mentioned kind, for storing the related application and configuration file that can realize the inventive method.
Processor 101 is the control centres of the device 10 obtaining FDD system down channel matrix, may be a central processing unit (centralprocessingunit, be called for short CPU), also can be specific integrated circuit (ApplicationSpecificIntegratedCircuit, be called for short ASIC), or be configured to the one or more integrated circuits implementing the embodiment of the present invention, such as: one or more microprocessor (digitalsingnalprocessor, be called for short DSP), or, one or more field programmable gate array (FieldProgrammableGateArray, be called for short FPGA).Processor 101 can be stored in software program in memory 102 and/or module by running or performing, and calls the data be stored in memory 102, performs the various functions of the device 10 obtaining FDD system down channel matrix.
Processor 101, for reading the current up channel matrix of a UE in the TDD system of disposing with described FDD system co-sited; According to described current up channel matrix, obtain the down channel matrix of the 2nd UE in described FDD system; Wherein, a described UE and described 2nd UE frequency range difference are less than or equal to pre-determined threshold.
Wherein, a UE and the 2nd UE frequency range close, the value of described pre-determined threshold can set according to the actual requirements, and the present invention does not specifically limit this.
Concrete, described processor 101 specifically may be used for:
Using the down channel matrix of described current up channel matrix as described 2nd UE;
Or;
By the down channel matrix of described current up channel Matrix Multiplication using default instruction matrix as described 2nd UE.
It should be noted that, processor 101 can for obtaining the processor independently arranged in the device 10 of FDD system down channel matrix, also can for obtain FDD system down channel matrix device 10 belonging to base station in processor, the present invention does not specifically limit this.
Below in conjunction with accompanying drawing, embodiments of the invention are specifically addressed.
On the one hand, the embodiment of the present invention provides a kind of method obtaining FDD system down channel matrix, when FDD system needs PMI to select suitable code book to carry out the precoding of downlink data transmission, the method of acquisition FDD system down channel matrix provided by the invention can be adopted, first obtain FDD system down channel matrix, obtain the PMI that this down channel matrix is corresponding again, can carry out selecting code book to carry out downlink data transmission by PMI.
As shown in Figure 2, described method can comprise:
The current up channel matrix of a UE in the TDD system that S201, reading and FDD system co-sited are disposed.
Wherein, the TDD system that FDD system co-sited is disposed, the frequency range that both dispose is substantially close, and both down time-frequency responses can be similar to thinks equal.
Optionally, the FDD system of co-sited and TDD system are deployed in same base station.
Further, the current up channel matrix of a UE in described TDD system is when performing S201, the current up channel matrix of the described UE obtained by channel estimating in TDD system.
Concrete, the time point performing S201 can include but not limited in following proposal any one:
The first scheme: terminal high-speed moves, and when FDD system needs to carry out downlink data transmission, perform S201.
Wherein, described terminal is the terminal in the 2nd UE.
Concrete, judge terminal whether high-speed mobile, can be judged by the translational speed of terminal.
Further, in the first scheme above-mentioned, before performing S201, described method can also comprise:
Judge the translational speed of terminal; If translational speed is more than or equal to predetermined threshold value, then illustrate that terminal high-speed moves, then perform S201.
Wherein, the value of described predetermined threshold value can set according to the actual requirements, and the present invention does not specifically limit this.
Preferably, described predetermined threshold value can be 100 kilometer per hours.
Concrete, obtain the process of the translational speed of terminal, the GPS position information of three-point fix technology or terminal can be adopted to obtain, and the present invention does not specifically repeat this process and limits.Whether every translational speed by acquisition terminal and then decision perform the scheme of S201, all belong to protection scope of the present invention.
First scheme: terminal high-speed moves, and when FDD system receives the PMI of terminal transmission, perform S201.
Further, in above-mentioned first scheme, before performing S201, described method can also comprise:
Judge the translational speed of terminal; If translational speed is more than or equal to predetermined threshold value, then described terminal high-speed moves.
In above-mentioned first scheme, before performing S201, described method can also comprise: the PMI that receiving terminal sends.If the translational speed of terminal is more than or equal to predetermined threshold value, when receiving the PMI that described terminal sends, perform S201.
Wherein, if the translational speed of terminal is less than predetermined threshold value, illustrate that terminal is not high-speed mobile, the PMI that terminal sends can accurate response channel the present situation, then PMI terminal sent is as the current PMI of FDD system.
It should be noted that, in above-mentioned first scheme, judge the execution sequencing of the PMI that the translational speed of terminal and receiving terminal send, can set according to the actual requirements, the present invention does not specifically limit this.
Optionally, first can judge that the translational speed of terminal is more than or equal to predetermined threshold value, then wait-receiving mode send to terminal PMI time, perform S201.
Optionally, first can receive the PMI that terminal sends, and if then judge that the translational speed of terminal is more than or equal to predetermined threshold value, then perform S201.
The third scheme:
When FDD system needs PMI to send for carrying out downlink data, namely perform S201.
It should be noted that, for the time of implementation point of S201, can determine according to the actual requirements; The embodiment of the present invention is listed below the time point of several execution S201, but is not the concrete restriction to the time point performing S201.
S202, according to described current up channel matrix, obtain the down channel matrix of the 2nd UE in FDD system.
Wherein, the frequency range difference of a UE and the 2nd UE is less than or equal to pre-determined threshold.
Concrete, in S202, according to described current up channel matrix, obtain the down channel matrix of the 2nd UE in FDD system, following two schemes can be included but not limited to:
Scheme 1,
Directly using the down channel matrix of described current up channel matrix as the 2nd UE.
Scheme 2,
By the down channel matrix of described current up channel Matrix Multiplication using default instruction matrix as the 2nd UE.
Wherein, described instruction matrix is stored in base station.
Optionally, described default instruction matrix can carry out device measuring acquisition by early stage; Or described default instruction matrix also can calculate acquisition by the frequency difference concrete according to FDD and TDD; The present invention does not limit for the obtain manner and particular content of looking after and guiding matrix.Every current up channel matrix according to looking after and guiding matrix and a UE draws the scheme of the 2nd UE down channel matrix, all belongs to protection scope of the present invention.
The method of the acquisition FDD system down channel matrix that the embodiment of the present invention provides, the current up channel matrix of a UE in the TDD system of being disposed by reading and FDD system co-sited; According to described current up channel matrix, obtain the down channel matrix of the 2nd UE in described FDD system.Due to TDD up-downgoing channel symmetry, the therefore current up channel matrix of TDD system and down channel approximate matrix, and because the deployment of FDD and TDD co-sited, a UE and the 2nd UE frequency range close, therefore, a UE and the 2nd UE down channel approximate matrix; That is, the current up channel matrix of a UE in the TDD system of disposing with FDD system co-sited is adopted to obtain the down channel matrix of the 2nd UE in FDD system, the channel conditions of current FDD system can be reacted accurately, therefore, achieve the down channel matrix of the 2nd UE in Obtaining Accurate FDD system, be convenient to obtain and accurately weigh the current channel conditions PMI of terminal to transmit data, improve systematic function.
On the other hand, the embodiment of the present invention also provides a kind of device 30 obtaining FDD system down channel matrix, for performing the method shown in Fig. 2; See Fig. 3, the device 30 of described acquisition FDD system down channel matrix can comprise:
Reading unit 301, for reading the current up channel matrix of a UE in the TDD system of disposing with described FDD system co-sited;
Acquiring unit 302, for the described current up channel matrix read according to described reading unit 301, obtains the down channel matrix of the 2nd UE in described FDD system.
Optionally, described acquiring unit 302 specifically may be used for:
Using the down channel matrix of described current up channel matrix as described 2nd UE;
Or;
By the down channel matrix of described current up channel Matrix Multiplication using default instruction matrix as described 2nd UE.
Further, see Fig. 4, the device 30 of described acquisition FDD system PMI can also comprise:
Judging unit 303, for judging the translational speed of terminal; Wherein, described terminal is the terminal in the 2nd UE;
Described reading unit 301 can also be used for, if described judging unit 303 judges that described translational speed is more than or equal to predetermined threshold value, reads the current up channel matrix of a UE in the TDD system of disposing with described FDD system co-sited.
Further, see Fig. 4, the device 30 of described acquisition FDD system down channel matrix can also comprise:
Receiving element 304, for the PMI that receiving terminal sends; Wherein, described terminal is the terminal in the 2nd UE;
Described reading unit 301 can also be used for, if described judging unit 303 judges that the translational speed of described terminal is more than or equal to predetermined threshold value, when described receiving element 304 receives the PMI of described terminal transmission, read the current up channel matrix of a UE in the TDD system of disposing with described FDD system co-sited.
It should be noted that, in the device 30 of the acquisition FDD system PMI that the embodiment of the present invention provides, the specific descriptions of functional module can the specific descriptions of corresponding content in reference method embodiment, and in this not go into detail for the embodiment of the present invention.
The device 30 of the acquisition FDD system down channel matrix that the embodiment of the present invention provides, the current up channel matrix of a UE in the TDD system of being disposed by reading and FDD system co-sited; According to described current up channel matrix, obtain the down channel matrix of the 2nd UE in described FDD system.Due to TDD up-downgoing channel symmetry, the therefore current up channel matrix of TDD system and down channel approximate matrix, and because the deployment of FDD and TDD co-sited, a UE and the 2nd UE frequency range close, therefore, a UE and the 2nd UE down channel approximate matrix; That is, the current up channel matrix of a UE in the TDD system of disposing with FDD system co-sited is adopted to obtain the down channel matrix of the 2nd UE in FDD system, the channel conditions of current FDD system can be reacted accurately, therefore, achieve the down channel matrix of the 2nd UE in Obtaining Accurate FDD system, be convenient to obtain and accurately weigh the current channel conditions PMI of terminal to transmit data, improve systematic function.
Through the above description of the embodiments, those skilled in the art can be well understood to, for convenience and simplicity of description, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, the internal structure by device is divided into different functional modules, to complete all or part of function described above.The specific works process of the device of foregoing description, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiments that the application provides, should be understood that disclosed apparatus and method can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described module or unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another device can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be a physical location or multiple physical location, namely can be positioned at a place, or also can be distributed to multiple different local.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this software product is stored in a storage medium, comprise all or part of step of some instructions in order to make an equipment (can be single-chip microcomputer, chip etc.) or processor (processor) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (8)
1. obtain a method for FDD system down channel matrix, it is characterized in that, comprising:
Read the current up channel matrix of first user equipment UE in the TDD system disposed with described FDD system co-sited;
According to described current up channel matrix, obtain the down channel matrix of the 2nd UE in described FDD system; Wherein, a described UE and described 2nd UE frequency range difference are less than or equal to pre-determined threshold.
2. method according to claim 1, is characterized in that, described according to described current up channel matrix, obtains the down channel matrix of the 2nd UE in described FDD system, comprising:
Using the down channel matrix of described current up channel matrix as described 2nd UE;
Or;
By the down channel matrix of described current up channel Matrix Multiplication using default instruction matrix as described 2nd UE.
3. method according to claim 1 and 2, is characterized in that, in the TDD system that described reading and described FDD system co-sited are disposed a UE current up channel matrix before, described method also comprises:
Judge the translational speed of terminal; Wherein, described terminal is the terminal in described 2nd UE;
If described translational speed is more than or equal to predetermined threshold value, perform the current up channel matrix of a UE in the TDD system that described reading and described FDD system co-sited dispose.
4. method according to claim 1 and 2, is characterized in that, in the TDD system that described reading and described FDD system co-sited are disposed a UE current up channel matrix before, described method also comprises:
The pre-coding matrix index PMI that receiving terminal sends; Wherein, described terminal is the terminal in described 2nd UE;
If described translational speed is more than or equal to predetermined threshold value, when receiving the PMI that described terminal sends, perform the current up channel matrix of a UE described in TDD system that described reading and described FDD system co-sited dispose.
5. obtain a device for FDD system down channel matrix, it is characterized in that, comprising:
Reading unit, for reading the current up channel matrix of a UE in the TDD system disposed with described FDD system co-sited;
Acquiring unit, for the described current up channel matrix read according to described reading unit, obtains the down channel matrix of the 2nd UE in described FDD system; Wherein, a described UE and described 2nd UE frequency range difference are less than or equal to pre-determined threshold.
6. device according to claim 5, is characterized in that, described acquiring unit specifically for:
Using the down channel matrix of described current up channel matrix as described 2nd UE;
Or;
By the down channel matrix of described current up channel Matrix Multiplication using default instruction matrix as described 2nd UE.
7. the device according to claim 5 or 6, is characterized in that, described device also comprises:
Judging unit, for judging the translational speed of terminal; Wherein, described terminal is the terminal in described 2nd UE;
Described reading unit also for, if described judging unit judges that described translational speed is more than or equal to predetermined threshold value, read and the current up channel matrix of a described UE.
8. the device according to claim 5 or 6, is characterized in that, described device also comprises:
Receiving element, for the pre-coding matrix index PMI that receiving terminal sends; Wherein, described terminal is the terminal in described 2nd UE;
Judging unit, for judging the translational speed of described terminal;
Described reading unit also for, if described judging unit judges that the translational speed of described terminal is more than or equal to predetermined threshold value, when described receiving element receives the PMI that described terminal sends, read and the current up channel matrix of a described UE.
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| CN109314553A (en) * | 2016-08-19 | 2019-02-05 | 索尼公司 | Electronic equipment and method and wireless communication system in wireless communication system |
| CN110943767A (en) * | 2019-11-08 | 2020-03-31 | 杭州电子科技大学 | Precoding design method based on channel part reciprocity in FDD large-scale MIMO system |
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