CN106256158A

CN106256158A - A kind of pilot frequency collocation method and device

Info

Publication number: CN106256158A
Application number: CN201480078604.6A
Authority: CN
Inventors: 刘永; 陈大庚
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-05-23
Filing date: 2014-05-23
Publication date: 2016-12-21
Anticipated expiration: 2034-05-23
Also published as: CN106256158B; WO2015176312A1

Abstract

A kind of pilot frequency collocation method and device, described method should include: base station judges whether data to be transmitted has pilot density to promote demand, if, then determine the demodulated reference signal DMRS mapping position at each Resource Block, and set up the mapping relations between data to be transmitted the first subframe and given antenna port according to the multiplexing number of plies；According to the continuous descending sub frame number of data to be transmitted, base station judges whether each subframe uses identical antenna terminal mapping relation, and will determine that result is added dispatch command to and is issued to terminal, whether the antenna terminal mapping relation comprising each subframe in described dispatch command shifts and mobile figure place；Base station configures the antenna terminal mapping relation of each subframe according to judged result.So, so that it may the channel that end side is effectively ensured estimates precision, and then ensures the data demodulation performance of end side.Particular for high level data multiplexing, such scheme, both do not resulted in pilot-frequency expense and be substantially improved, moreover it is possible to effectively promoted pilot density.

Description

A kind of pilot frequency collocation method and device

The present invention relates to communication technical field for technical field, and in particular to a kind of pilot frequency collocation method and device.Background technology

With continuing to develop for mobile communication technology, at a high speed, Large Copacity, wide covering turn into the principal character of modern wireless communication systems, how to solve to seem particularly critical the problems such as serious decline and intersymbol interference caused by communication range expansion, communication environment complexity are various.In order to solve this problem, technology widely used at present is：MI MO (Multi-Input Multi-Output, multiple-input and multiple-output) technology of power system capacity can be significantly improved, with OFDM (Orthogonal Frequency- Division Multiplexing, OFDM）For the multi-carrier modulation technology of representative.

In ofdm system, suppressed carrier is used to each load wave modulation, corresponding to this, receiving terminal is when carrying out coherent demodulation, it is necessary to reference to the reference signal RS (Reference Signal) of known amplitude and phase.Accordingly, it is contemplated that in MI MO systems, transmitting terminal and receiving terminal can support multi-layer data to transmit using multiple antennas, namely every antenna（Physical antenna or virtual-antenna）All there is independent data channel, therefore, when receiving terminal carries out coherent demodulation, it is necessary to which the RS signals based on precognition, carry out channel estimation to every antenna, reduce the data of the channel.

In order to realize channel quality measurement and the data demodulation of MI MO systems, lte-a system defines a variety of frequency pilot signs：CRS (Cell-specific Reference Signals, cell common reference signal）, DMRS (Demodulation Reference Signal, demodulated reference signal）, CSI-RS (Channel State Information- Reference Signal, channel quality measurement reference symbol）.Wherein, DMRS channel estimating performance largely decides the demodulation performance of data, and DMRS channel estimating performance depend heavilys on every layer of DMRS density.

In current standard, descending use DMRS maximums can support 8 transmitting data stream numbers（I.e. 8 layers DMRS multiplexings）, 24RE/RB running time-frequency resource is taken altogether, namely the DMRS pilot densities of each virtual-antenna port are 3RE/RB on frequency domain, corresponding to this, receiving terminal more can accurately carry out DMRS channel estimations.

As people gradually step up to wireless communication system requirement, higher-dimension multiple antennas HD-MIMO (High Dimensional MI MO) technology is arisen at the historic moment, i.e., to dispose more antennas in transmitting terminal and receiving terminal, This can also bring the problem of DMRS pilot-frequency expenses are excessive while improving power system capacity, expanding the coverage area.Such as, according to existing pilot density standard, when realizing 24 layers of DMRS multiplexings, DMRS will take 72 RE/RB, and DMRS pilot-frequency expenses are up to 43%, if considering further that the expense of other frequency pilot signs, will certainly seriously reduce the efficiency of transmission of useful data.To ensure data transmission efficiency, it is accomplished by reducing DMRS pilot densities, this can directly affect the precision of channel estimation of receiving terminal, and then influences the data demodulation performance of receiving terminal indirectly, and as the increase DMRS pilot densities of the DMRS multiplexing numbers of plies are lower, this problem is more serious.The content of the invention

The pilot frequency collocation method and device of the embodiment of the present invention, when high level data is multiplexed, the accurate of receiving terminal channel estimation is ensured using relatively low pilot density.

Therefore, the embodiment of the present invention provides following technical scheme：

In a first aspect, the embodiments of the invention provide a kind of pilot frequency configuration device, described device includes：First judging unit, for judging whether data to be transmitted has pilot density to lift demand；Mapping position determining unit, for when first judging unit is judged to being, determining mapping positions of the demodulated reference signal DMRS in each resource block；

Mapping relations set up unit, for the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port；

Second judging unit, for judging whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted；

Adding device, is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit for the judged result of second judging unit to be added into dispatch command；

Dispensing unit, the antenna terminal mapping relation for configuring each subframe according to judged result.

In the first possible implementation of first aspect, the mapping position determining unit includes：Frequency domain mapping position determining unit, for determining frequency domain mapping positions of the DMRS in resource block：

K = N^n_{PRB +}K', wherein, it is the frequency domain scale of resource block,！！Indexed for resource block, K' is subcarrier 0,1,5,6,10,11；

Time domain mapping position determining unit, for determining time domain mapping positions of the DMRS in resource block： L = L'mod2 + 5 ,

0,1 if n_smod2 = 0

Wherein, L'I ^ are time slot rope^;

2,3 if n mod2=l in second of possible implementation of first aspect,

If it is any of 1 ~ 8 to be multiplexed the number of plies, given antenna port p is Q₍ Q₇, then the mapping relations set up unit foundation antenna terminal mapping relation be：

_K,=0,5,10 ·

_ l, 6, ll₂ ,Q₃ ,Q₅,Q₇' if the multiplexing number of plies is any of 9 ~ 12, given antenna port p is Q Q, then the antenna terminal mapping relation that the mapping relations set up unit foundation is：

" 0,6 pe { Q., Q】, Q₆, Q₉}

K' 1,10 pe{Q₂, Q₃, Q₇, Q₁₀} ；

5,11 pe{Q₄, Q₅, Q₈, Q } if the multiplexing number of plies is any of 13 ~ 24, given antenna port p is Q.~Q₂₃, then the mapping relations set up unit foundation antenna terminal mapping relation be：

1 pe{Q₂ ,Q₃ ,Q₁₃,Q₁₉}

5 pe{Q₄ ,Q₅ ,Q₁₄,Q₂₀}

K'

6 pe{Q₆, Q₇, Q₁₅, Q₂₁} °

10 pe{Q₈, Q₉, Q₁₆, Q₂J

11 pe{Q₁₀, Q, Q₁₇, Q₂₃In the third possible implementation of first aspect, second judging unit includes：Second judgment sub-unit, for judging whether the descending sub frame of the data to be transmitted is at least two continuous descending sub frames, if it is not, then judging antenna terminal mapping relation of the judged result as each subframe without displacement；If it is, judging that the judged result should be shifted as the antenna terminal mapping relation of each subframe；

Mobile digit determining unit, for when second judgment sub-unit is judged to being, lifting demand according to the pilot density and determining the mobile digit.

With reference to the third possible implementation of first aspect, in the 4th kind of possible implementation, second judging unit is included also： Time domain granularity determining unit, time domain granularity is determined for the continuous descending sub frame number and Doppler frequency shift according to the data to be transmitted；

The mobile digit determining unit, for determining the mobile digit according to pilot density lifting demand and the time domain granularity.

With reference to first aspect or first aspect the first to any of the 4th kind possible implementation, in the 5th kind of possible implementation, the pilot frequency configuration device also includes：Pilot density lifts demand determining unit,

The pilot density lifts demand determining unit, and the demodulation performance for being fed back according to terminal determines the pilot density lifting demand；Or,

The pilot density lifts demand determining unit, for determining that the pilot density lifts demand according to current pilot density and target pilot density.

Second aspect, the embodiments of the invention provide a kind of pilot frequency configuration device, described device includes：Receiving unit, for receiving whether the antenna terminal mapping relation of each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit；

Channel estimating unit, for when the dispatch command represents antenna terminal mapping relation without displacement, channel estimation to be carried out using current pilot density；

Interpolation process unit, for when the dispatch command represents that antenna terminal mapping relation has carried out displacement, carrying out interpolation processing to each subframe according to the multiplexing number of plies and the mobile digit, lifting the pilot density of the subframe；

The channel estimating unit, is additionally operable to the pilot density after the lifting using interpolation process unit output and carries out channel estimation.

In the first possible implementation of second aspect, described device also includes：

Feedback unit, for demodulating the data to be transmitted that base station is sent using channel estimation value, and feeds back to base station by demodulation performance.

The third aspect, the embodiments of the invention provide a kind of pilot frequency collocation method, methods described includes：Base station judges whether data to be transmitted has pilot density to lift demand, if, then determine mapping positions of the demodulated reference signal DMRS in each resource block, and the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port；

Base station judges whether each subframe uses identical antenna according to the continuous descending sub frame number of data to be transmitted Port mapping relationship, and will determine that result is added to dispatch command and is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit；

Base station configures the antenna terminal mapping relation of each subframe according to judged result.

In the first possible implementation of the third aspect, the determination DMRS each resource block mapping position, including：

Frequency domain mapping position=N^ns of the DMRS in resource block_{PRB +}K',

Wherein, it is the frequency domain scale of resource block,_ηIt is subcarrier 0,1,5,6,10,11 for resource block Suo Gong K'；

DMRS resource block time domain mapping position L=L'mod2+5, wherein, L' be time slot rope

In second of possible implementation of the third aspect, the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port, including：

If it is any of 1 ~ 8 to be multiplexed the number of plies, given antenna port p is Q (Q₇, then antenna terminal mapping relation be：

_ l, 6, ll pe { Q₂ ,Q₃ ,Q₅,Q₇' if the multiplexing number of plies is any of 9 ~ 12, given antenna port p is Q Q, then antenna terminal mapping relation is：

" 0,6 pe { Q., Q】, Q₆, Q₉}

K'1,10 pe { Q₂, Q₃, Q₇, Q₁₀} ；

5,11 p_e{Q₄, Q₅, Q₈, Q } if the multiplexing number of plies is any of 13 ~ 24, given antenna port p is Q.~Q₂₃, then antenna terminal mapping relation be：

1 pe{Q₂ ,Q₃ ,Q₁₃,Q₁₉}

5 pe{Q₄, Q₅, Q₁₄, Q₂。}

K'=

6 pe{Q₆ ,Q₇ ,Q₁₅,Q₂₁} °

10 pe{Q₈, Q₉, Q₁₆, Q₂J

11 pe{Q₁₀, Q, Q₁₇, Q₂₃} In the third possible implementation of the third aspect, the base station judges whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted, including：

Whether the descending sub frame for judging the data to be transmitted is at least two continuous descending sub frames, if it is, the judged result should be shifted for the antenna terminal mapping relation of each subframe, and determines the mobile digit according to pilot density lifting demand；Otherwise, the judged result is the antenna terminal mapping relation of each subframe without displacement.

It is described that the mobile digit is determined according to pilot density lifting demand in the 4th kind of possible implementation with reference to the third possible implementation of the third aspect, including：

Time domain granularity is determined according to the continuous descending sub frame number and Doppler frequency shift of the data to be transmitted, and the mobile digit is determined according to pilot density lifting demand and the time domain granularity.

With reference to the third aspect or the third aspect the first to any of the 4th kind possible implementation, in the 5th kind of possible implementation, the mode for determining pilot density lifting demand is：The demodulation performance that base station is fed back according to terminal determines the pilot density lifting demand；Or, base station determines that the pilot density lifts demand according to current pilot density and target pilot density.Fourth aspect, the embodiments of the invention provide a kind of pilot frequency collocation method, methods described includes：Whether the antenna terminal mapping relation that terminal receives each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit；

If the dispatch command represents antenna terminal mapping relation without displacement, terminal then carries out channel estimation using current pilot density；

If the dispatch command represents that antenna terminal mapping relation is shifted, terminal then carries out interpolation processing according to the multiplexing number of plies and the mobile digit to each subframe, lifts the pilot density of the subframe；Terminal carries out channel estimation using the pilot density after lifting.

In the first possible implementation of fourth aspect, methods described also includes：

Terminal demodulates the data to be transmitted that base station is sent using channel estimation value, and demodulation performance is fed back into base station.

5th aspect, the embodiments of the invention provide a kind of pilot frequency configuration device, described device includes：At least one processor, memory and at least one communication bus,

The communication bus, for realizing the connection communication between at least one processor and the memory； The memory for storage program instruct, the processor be used for according to described program instruction perform Yi Xia Walk it is rapid：

Judge whether data to be transmitted has pilot density to lift demand, if it is, mapping positions of the demodulated reference signal DMRS in each resource block is determined, and the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port；

Judge whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted, and will determine that result is added to dispatch command and is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit；

The antenna terminal mapping relation of each subframe is configured according to judged result.

In the first possible implementation of the 5th aspect, the processor determines mapping positions of the DMRS in each resource block in such a way：

Frequency domain mapping position K=N^ns of the DMRS in resource block_{PRB +}K',

Wherein, it is the frequency domain scale of resource block, is that resource block Suo Gong K' are subcarrier 0,1,5,6,10,11；

DMRS resource block time domain mapping position L L'mod2+5,

0,1 if n_smod2 = 0

Wherein, L'

The if n mod2 of I 2,3=l is in second of possible implementation of the 5th aspect, the mapping relations that the processor is set up between the subframe of data to be transmitted first and given antenna port in such a way：

If it is any of 1 ~ 8 to be multiplexed the number of plies, given antenna port p is Q.~Q₇, then antenna terminal mapping relation be：

_ l, 6, ll pe { Q₂ ,Q₃ ,Q₅,Q₇' if the multiplexing number of plies is any of 9 ~ 12, given antenna port p is Q.~ Q, then antenna terminal mapping relation be：

0,6 pe{Q., Q】, Q₆, Q₉}

Pe { the Q of K'=1,10₂, Q₃, Q₇, Q₁₀} ；

5,11 pe { Q₄ ,Q₅ ,Q₈,Q_nIf multiplexing the number of plies be any of 13 ~ 24, given antenna port p be Q.~Q₂₃, then antenna Port mapping relationship is：

I pe{Q₂ ,Q₃ ,Q₁₃,Q₁₉}

κ,= 5 pe{Q₄, Q₅, Q₁₄, Q₂。}

" 6 pe{Q₆ ,Q₇ ,Q₁₅,Q₂₁} °

10 pe{Q₈, Q₉, Q₁₆, Q₂J

II pe{Q₁₀ ,Q_n ,Q₁₇,Q₂₃In the third possible implementation of the 5th aspect, the processor judges whether each subframe uses identical antenna terminal mapping relation in such a way：

With reference to the third possible implementation of the 5th aspect, in the 4th kind of possible implementation, the processor determines the mobile digit in such a way：

With reference to the 5th aspect or the 5th aspect the first to any of the 4th kind possible implementation, in the 5th kind of possible implementation, the processor determines pilot density lifting demand in such a way：

The demodulation performance fed back according to terminal determines the pilot density lifting demand；Or,

The pilot density lifting demand is determined according to current pilot density and target pilot density.

6th aspect, the embodiments of the invention provide a kind of pilot frequency configuration device, described device includes：At least one processor, memory and at least one communication bus,

The communication bus, for realizing the connection communication between at least one processor and the memory；

The memory for storage program instruct, the processor be used for according to described program instruction perform Yi Xia Walk it is rapid：

Whether the antenna terminal mapping relation for receiving each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit； If the dispatch command represents antenna terminal mapping relation without displacement, processor then carries out channel estimation using current pilot density；

If the dispatch command represents that antenna terminal mapping relation is shifted, processor then carries out interpolation processing according to the multiplexing number of plies and the mobile digit to each subframe, lifts the pilot density of the subframe；Processor carries out channel estimation using the pilot density after lifting.

The 6th aspect the first possible implementation in, the processor be additionally operable to perform Yi Xia Walk it is rapid：

The data to be transmitted that base station is sent is demodulated using channel estimation value, and demodulation performance is fed back into base station.The pilot frequency collocation method and device of the embodiment of the present invention, base station side is before carrying out data transmission, demand is first lifted according to pilot density and determines the antenna terminal mapping relation of each subframe, and whether will shift and shift how much to be added in dispatch command and be handed down to terminal.Accordingly, end side is before receiving the data, the dispatch command first issued according to base station determines the pilot density for channel estimation, if dispatch command represents that the port mapping of each subframe is not shifted, and terminal directly can carry out channel estimation using current pilot density；If dispatch command represents that the port mapping of each subframe is shifted, terminal first passes through interpolation processing lifting current pilot density, recycles the pilot density after lifting to carry out channel estimation.In this way, just can effectively ensure that the channel estimation precision of end side, and then ensure the data demodulation performance of end side.Particular for high level data multiplexing, such scheme had not both resulted in pilot-frequency expense and had been substantially improved, it is ensured that the efficiency of transmission of useful data；Pilot density can also effectively be lifted, it is ensured that the channel estimation precision and data demodulation performance of end side.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, the required accompanying drawing used in embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the graph of a relation of pilot density and channel estimating performance in the embodiment of the present invention；

Fig. 2 is the flow chart of base station side pilot frequency collocation method of the embodiment of the present invention；

Fig. 3-1 is the port mapping relationship schematic diagram in the case of Rank 1-8 in the embodiment of the present invention；Fig. 3-2 is the port mapping relationship schematic diagram in the case of Rank 9-12 in the embodiment of the present invention； Fig. 3-3 is the port mapping relationship schematic diagram in the case of Rank 13-24 in the embodiment of the present invention；Fig. 4-1 is the schematic diagram shifted without port mapping in the embodiment of the present invention；

Fig. 4-2 is a kind of schematic diagram of progress port mapping displacement in the embodiment of the present invention；

Fig. 4-3 is another schematic diagram of progress port mapping displacement in the embodiment of the present invention；

Fig. 5 is the flow chart of end side of embodiment of the present invention pilot frequency collocation method embodiment 1；

Fig. 6 is the flow chart of end side of embodiment of the present invention pilot frequency collocation method embodiment 2；

Fig. 7 is the performance boost effect diagram of the embodiment of the present invention；

Fig. 8 is the composition schematic diagram of base station side pilot frequency configuration device of the embodiment of the present invention；

Fig. 9 is the composition schematic diagram of end side of embodiment of the present invention pilot frequency configuration device；

Figure 10 is that the hardware of pilot frequency configuration device of the embodiment of the present invention constitutes schematic diagram.Embodiment

In order that those skilled in the art more fully understand the scheme of the embodiment of the present invention, the detailed description with embodiment to Zuo Jin mono- of embodiment of the present invention Walk below in conjunction with the accompanying drawings.

Before scheme of the embodiment of the present invention is introduced, first the concrete application scene to scheme is explained.

MI MO (Multi-Input Multi-Output, multiple-input and multiple-output）The resource of technology utilization space dimension, can make signal obtain array gain, spatial multiplexing gain, diversity gain and co-channel interference reduction gain in space, exponentially lift the capacity and spectrum efficiency of communication system on the premise of system bandwidth is not increased.In LTE (Long Term Evolution, Long Term Evolution）In system, up to 8 layers of data transfer can be supported simultaneously using multiple antennas in transmitting terminal and receiving terminal.

In a communications system, when receiving terminal carries out data demodulation, coherent demodulation has 3dB or so gain with respect to non-coherent demodulation, is widely adopted in Modern Communication System.In view of OFDM (Orthogonal Frequency-Division Multiplexing, OFDM）System is suppressed carrier to each load wave modulation, therefore receiving terminal needs to utilize reference signal（Reference Signal, RS.In addition reference signal is also referred to as pilot signal, reference signal）Carry out coherent demodulation.Reference signal is distributed in OFDM symbol on the different resource unit R E (Resource Element) in time-frequency two-dimensional space, with known amplitude and phase.

Understood based on above-mentioned introduction, when MI MO systems carry out multi-layer data transmission, each transmission antenna all corresponds to each independent data channel, and receiving terminal needs the RS signals based on precognition to every transmission antenna Carry out channel estimation, and the data transmitted according to channel estimation value also original sender.It should be noted that channel estimation refers to compensate channel fading and noise and rebuilds the process that receives signal, the RS that it is predicted using transmitting terminal and receiving terminal changes to follow the trail of the time domain and frequency domain of channel.

Specifically, in order to realize that the channel quality measurement and data of mimo system are demodulated, lte-a system defines a variety of frequency pilot signs, such as：CRS (Cell-specific reference signals, cell common reference signal）, DMRS (Demodulation Reference Signal, demodulated reference signal）, CSI-RS (Channel State Information- Reference Signal, channel quality measurement reference symbol).Wherein, DMRS is used for PDSCH (Physical Downlink Share Channel, Physical Downlink Shared Channel）Demodulation, CSI-RS be used for CQI (Channel Quality Indicator, channel quality indicate）, PMI (Precoding Matrix Indicator, pre-coding matrix instruction）, Rl (Rank Indicator, order instruction）Etc. reporting for information.In addition, it is necessary to which explanation, DMRS is only sent on scheduled resource block RB (Resource Block), and the quantity that DMRS is sent is corresponded with antenna port, and the two is associated by layer mapping and precoding.

In DMRS schemes, transmitting terminal is used to realize the sequence generation of DMRS signals, resource impact, port mapping and MI MO modulation, receiving terminal is used to carry out data demodulation based on DMRS channel estimation values, and DMRS channel estimating performances are of crucial importance, it largely decides the demodulation performance of data, and it is every layer of DMRS density to influence the factors of DMRS channel estimation precisions.In current standard, when DMRS pilot densities are 3RE/RB, receiving terminal is the accurate estimation that channel can be achieved.

In LTE-A existing standard, SU-MI MO maximums support 8 layers of orthogonal DMRS multiplexings, blunt, and system can be with the data transfer of most 8 streams of concurrent multiplexing.DMRS distribution situation is as follows：

(1) when it is 1 or 2 (i.e. Rank 1-2) to be multiplexed the number of plies

Base station uses CDM (Code Division Multiplexing, code division multiplexing）Mode orthogonalization DMRS, DMRS take 12 RE in each RB, are specifically distributed as：

On frequency domain, be distributed in each RB the 1st, 6, on 11 subcarriers；

In time domain, be distributed in each subframe the 5th, 6,12, in 13 OFDM symbols；Corresponding to this, DMRS expenses are 12/12*14=7.1%.

(2) at any (i.e. Rank 3-8) in being multiplexed the number of plies for 3 ~ 8

Base station is using CDM and FDM (Frequency Division Multiplexing, frequency division multiplexing）Mode the orthogonalization DMRS, DMRS of hybrid multiplex take 24 RE in each RB, are specifically distributed as： On frequency domain, be distributed in each RB the 0th, 1,5,6,10, on 11 subcarriers；In time domain, be distributed in each subframe the 5th, 6,12, in 13 OFDM symbols；Corresponding to this, DMRS expenses are 24/12*14=14%.

Based on above-mentioned DMRS distribution modes, the DMRS pilot densities of each port ports are 3RE/RB on frequency domain, if the DMRS that the standard is applied into higher order is multiplexed, pilot-frequency expense problem will be highlighted.Such as, when realizing 24 layers of multiplexing, if being calculated by existing 3RE/RB pilot density, DMRS will take 72RE/RB, and pilot-frequency expense is 72/12*14=43%, and this is obviously difficult to be received.Therefore, DMRS pilot densities can only be constantly reduced with the increase of the multiplexing number of plies, pilot-frequency expense is reduced with this, useful data efficiency of transmission is improved.But it can be seen from Fig. 1, as pilot density is reduced, the precision of channel estimation of receiving terminal is decreased obviously, and drastically influence the data demodulation performance of receiving terminal.

Understand in summary, under HD-MI MO scenes, if keeping existing pilot density standard constant, the problem of data transmission efficiency is low will certainly be brought, if reduction pilot density, can influence the demodulation performance of receiving terminal.The embodiment of the present invention is to be proposed for this, it is intended to be multiplexed for the high level data of H D-MI MO scenes, preferably channel estimation precision is ensured using relatively low pilot density.

Scheme of the embodiment of the present invention is explained with reference to specific example.Referring to Fig. 2, the flow chart of base station side pilot frequency collocation method of the embodiment of the present invention is shown, it may include：Walk rapid 101, base station judges whether data to be transmitted has pilot density to lift demand, if it is, Zhi Hang Walk rapid 102;If it is not, then can not process, or pilot frequency configuration is carried out by current mode, the embodiment of the present invention can be not specifically limited to this.

The embodiment of the present invention is in order to solve the problem of receiving terminal precision of channel estimation deteriorates caused by DMRS pilot densities are reduced, and proposition is a kind of to lift the scheme of DMRS pilot densities indirectly using port mapping displacement, interpolation processing.Corresponding to this, base station to terminal before data are sent, first to judge this data transmission procedure is to use existing pilot frequency configuration mode, or this Walk is performed suddenly using the pilot frequency configuration mode of the present invention, namely base station, judges whether data to be transmitted has pilot density to lift demand, if, Shu Walk can then be continued executing with Xia rapid, and pilot frequency configuration is carried out by the present invention program, to realize the purpose for improving pilot density.

Walk rapid 102, determines mapping positions of the demodulated reference signal DMRS in each resource block.

During this Walk is rapid, DMRS RB mapping position can be presented as its mapping position of frequency domain and The mapping position of time domain, as a kind of example, based on principle of equipartition, the 0th can be selected on frequency domain, 1,5,6,10,11 subcarriers, the mapping position determined in time domain under selection the 5th, 6,12,13 symbols, such example can be presented as：

Frequency domain mapping positions of the DMRS in resource block： K = N^n_{PRB +} K' ,

Wherein, it is the frequency domain scale of resource block,！！For resource block index, K' be subcarrier 0,1,

5、 6、 10、 11；

Time domain mapping positions of the DMRS in resource block： L = L'mod2 + 5 ,

Twenty, θ, Ι if n_smod2 = 0 i

Wherein, L'=, n_sFor |。

[2,3 if n_sMod2=l is it should be noted that it is determined that during DMRS mapping positions, as long as not conflicting mutually with the position of other pilot symbol distributions in existing standard；Or, as technology develops, DMRS can also be distributed in the position that some frequency pilot signs being cancelled take, and the embodiment of the present invention can be not specifically limited to this.

Walk rapid 103, the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port.

Walk rapid 104, base station judges whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted, and will determine that result is added to dispatch command and is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit.

Walk rapid 105, base station configures the antenna terminal mapping relation of each subframe according to judged result.

Walk rapid 102 is mainly used in realizing that DRMS time-frequency domain resources mapping , Walk rapid 103 ~ 105 are mainly used in realizing DMRS antenna terminal mapping.Before port mapping is carried out, base station needs first to obtain network configuration information, e.g., dual-mode antenna number, multiplexing number of plies of configuration etc., and the antenna port number needed to use and specific antenna end slogan are determined therefrom that, DMRS antenna terminal mappings are then carried out again.Mapping process can be presented as that following Liang Walk is rapid：

1. determine the corresponding DMRS antenna terminal mappings relation of first subframe

According to the difference of the multiplexing number of plies, DMRS antenna terminal mappings are also different, are specially：A. the multiplexing number of plies is any of 1 ~ 8（That is Rank 1-8), and the numbering for 8 antenna ports specified is Q. ~ Q₇If 8 antenna ports are embodied as port 207 ~ 214, antenna terminal mapping relation embodies such as following formula（1), specifically referring also to shown in Fig. 3-1： [0,5,10 pe {207, 208, 211, 213}

Κ':

{ it is any of 9 ~ 12 (i.e. Rank9-12) that 209,210,212,214) b. is multiplexed the number of plies to 11,6,11 pe, and the numbering for 12 antenna ports specified is Q.Q, if 12 antenna ports are embodied as port 207 ~ 218, antenna terminal mapping relation embodies such as following formula（2), specifically referring also to shown in Fig. 3-2：

6

κ' 10

11 pe 211,212,215,218) the c. multiplexing numbers of plies are any of 13 ~ 24 (i.e. Rank 13-24), and the numbering for 24 antenna ports specified is Q.〜Q₂₃If 24 antenna ports are embodied as port 207 ~ 230, antenna terminal mapping relation embodies such as following formula（3), specifically referring also to shown in Fig. 3-3：

It should be noted that given antenna port above（Such as the port in the case of Rank13-24

207-230) port mapping relationship（As in the case of Rank13-24, subcarrier 0 be mapped to port 207,208,219,225) be only a kind of example, in actual use, other unappropriated contiguous ports can also be elected as given antenna port as needed, or, or each subcarrier distributes other ports, as long as not making multiple subcarriers while being mapped to a port, the embodiment of the present invention can be not specifically limited to this.

2. determine the corresponding DMRS antenna terminal mappings relation of other subframes

In the embodiment of the present invention, demand, the difference of the continuous descending sub frame number of data to be transmitted are lifted according to pilot density, the DMRS antenna terminal mapping relations of other subframes would also vary from, and can be embodied as two kinds of mapping relations, illustrate as is explained below.

This Walk rapid 2 can be presented as that two perform action：One is, selects the DMRS antenna terminal mapping modes of other subframes；Two are, configure the DMRS antenna terminal mapping relations of other subframes.

, can be specific as follows by the continuous descending sub frame number of data to be transmitted come selection port mapping mode in first execution action： (1) if the descending sub frame that data to be transmitted is included is single subframe, illustrate to handle to lift pilot density using shifting interpolation etc..Corresponding port mapping mode is：Other subframes use with first subframe identical DMRS antenna terminal mapping relation, for details, reference can be made to Fig. 4-1 example showns.

(2) if the descending sub frame of data to be transmitted is at least two continuous descending sub frames, illustrate to handle to lift pilot density using shifting interpolation etc..Corresponding port mapping mode is：In other subframes

- it can partly use the DMRS antenna terminal mapping relation different from first subframe, for details, reference can be made to Fig. 4-2, (the 2nd subframe is different from the 1st subframe, 3rd subframe is identical from the 1st subframe), Fig. 4-3 (the 2nd, 3 subframes it is different with the 1st subframe, the 4th subframe is identical with the 1st subframe）It is shown.

This execution action in, using at least two continuous descending sub frames as whether the Rule of judgment shifted, be based primarily upon following two reasons：One is, terminal needs to carry out channel estimation for down channel, recovers descending sub frame channel, therefore select descending sub frame；Two are, the main design thought of the present invention program be shifted by port mapping, interpolation processing mode improves DMRS pilot densities, and interpolation can only be realized in continuous subframes, therefore by whether the Rule of judgment shifted is set at least two continuous descending sub frames.

In addition, from interpolation processing, for the head and the tail subframe in two continuous descending sub frames or at least three continuous descending sub frames, row interpolation can be entered by extrapolation mode, i.e., the pilot density of another subframe is lifted by way of the corresponding sub-carrier positions horizontal sliding of a subframe；For the subframe at least three continuous descending sub frames in addition to head and the tail subframe, then it can enter row interpolation, lifting pilot density by interpolation method.

, can be directly according to formula if port displacement need not be carried out as shown in Fig. 4-1 in second execution action（1) or（2) or（3) mapping relations between other subframes and given antenna port are determined, and the dispatch command for being not required to displacement will be issued to terminal, here is omitted.

If needing to carry out port displacement as shown in Fig. 4-2,4-3, base station is then needed first to determine the port mapping movement digit of each subframe, then again based on the DMRS port mapping relations of first subframe, the DMRS port mapping relations of other subframes are determined successively according to mobile digit.Meanwhile, base station can will also determine that carrying out port mapping displacement and mobile digit is added in dispatch command, is issued to terminal, carry out using when interpolation processing improves pilot density for terminal, be temporarily not detailed herein.The process that port mapping is shifted is explained by taking two specific examples as an example below.

Example one

Referring to Fig. 4-2, what it reflected is subframe port mapping situation when mobile digit is 3, wherein, The port mapping of 1st subframe is：0th subcarrier maps port 207,208,219,225,1st subcarrier maps port 209,210,220,226,5th subcarrier maps port 211,212,221,227,6th subcarrier maps port 213,214,222,228, the subcarrier maps port 217,218,224,230 of 10th subcarrier maps port the 215,216,223,229, the 11st；

The port mapping of 2nd subframe is：0th subcarrier maps port 213,214,222,228,1st subcarrier maps port 215,216,223,229,5th subcarrier maps port 217,218,224,230,6th subcarrier maps port 207,208,219,225, the subcarrier maps port 211,212,221,227 of 10th subcarrier maps port the 209,210,220,226, the 11st；

The port mapping of 3rd subframe is mobile 3 on the basis of the 2nd subframe, and identical with the port mapping of the 1st subframe, here is omitted.

Example two

Referring to Fig. 4-3, what it reflected is the subframe port mapping situation that mobile digit is 2, wherein, the port mapping of the 1st subframe is：0th subcarrier maps port 207,208,219,225,1st subcarrier maps port 209,210,220,226,5th subcarrier maps port 211,212,221,227,6th subcarrier maps port 213,214,222,228, the subcarrier maps port 217,218,224,230 of 10th subcarrier maps port the 215,216,223,229, the 11st；

The port mapping of 2nd subframe is：0th subcarrier maps port 215,216,223,229,1st subcarrier maps port 217,218,224,230,5th subcarrier maps port 207,208,219,225,6th subcarrier maps port 209,210,220,226, the subcarrier maps port 213,214,222,228 of 10th subcarrier maps port the 211,212,221,227, the 11st；

The port mapping of 3rd subframe is：0th subcarrier maps port 211,212,221,227,1st subcarrier maps port 213,214,222,228,5th subcarrier maps port 215,216,223,229,6th subcarrier maps port 217,218,224,230, the subcarrier maps port 209,210,220,226 of 10th subcarrier maps port the 207,208,219,225, the 11st.

The port mapping of 4th subframe is mobile 2 on the basis of the 3rd subframe, and identical with the port mapping of the 1st subframe, here is omitted.

Fig. 4-2,4-3 are shown in the case of Rank 13-24, DMRS antenna terminal mapping process of each subframe under two kinds of different mobile digits, mobile digit difference may result in the distance being spaced between two adjacent sub-frames with identical port mapping relationship（The number of sub frames at the two interval can be embodied as）Not Together, so cause interpolation processing lifted pilot density ability it is also different.Such as, in Fig. 4-2 example showns, the 1st, 3 subframes be the adjacent sub-frame with identical port mapping relationship, one times of the pilot density lifting of the 2nd subframe using the two come the subframe of interpolation the 2nd, can be made；Similarly, the 2nd, 4 subframes are also the adjacent sub-frame with identical port mapping relationship, can be both come the subframe of interpolation the 3rd, the pilot density of the 3rd subframe is set to lift one times, by that analogy, the pilot density of subframe can be lifted one times by interpolation processing, here is omitted.In Fig. 4-3 example showns, the 1st, 4 subframes be the adjacent sub-frame with identical port mapping relationship, one times of the pilot density lifting of the 2nd, 3 subframes using the two come interpolation the 2nd, 3 subframes, can be made；Similarly, the 2nd, 5 subframes are also the adjacent sub-frame with identical port mapping relationship, can make one times of the pilot density lifting of the 3rd, 4 subframes using the two come interpolation the 3rd, 4 subframes（Now, the pilot density of the 3rd subframe is elevated twice), by that analogy, can be lifted the pilot density of subframe twice by interpolation processing, here is omitted.Specifically, the embodiments of the invention provide the mode that two kinds determine mobile digit：Mode one, lifts demand according to pilot density and determines mobile digit；Mode two, lifts demand according to pilot density and time domain granularity determines mobile digit.

With reference to two kinds of concrete conditions for determining pilot density lifting demand, the implementation process of the mobile digit mode one of pair determination is explained.

Situation one, the demodulation performance that base station is fed back according to terminal determines that pilot density lifts demand, and the process for accordingly determining mobile digit is：

(1) it can be seen from Fig. 4-2,4-3, mobile digit is fewer, and the other subframes being spaced between two adjacent sub-frames with identical port mapping relationship are more（Fig. 4-2 movement digits are to be spaced pilot density after a subframe 2, interpolation processing between 3, the subframe 1,3 with identical port mapping relationship to lift one times；Fig. 4-3 movement digits are 2, two subframes 2,3 are spaced between subframe 1,4 with identical port mapping relationship, twice) pilot density is lifted after interpolation processing, therefore, when the demodulation performance that terminal is fed back is poor, can accordingly by mobile digit set it is more slightly smaller, otherwise when terminal demodulation performance is preferable, then by mobile digit set it is slightly bigger.

(2) a fixed mobile digit is preset, when terminal is poor to base station feedback demodulation performance, base station moves digit to configure the port mapping relationship of each subframe according to the fixation.

Correspondence above two scheme, terminal carries out channel estimation, data solution using the pilot density after lifting It after tune, if demodulation performance is still problematic, can also continue to demodulation performance feeding back to base station, used when adjusting mobile digit for base station, here is omitted.

Situation two, base station determines that pilot density lifts demand according to current pilot density and target pilot density, and the process for accordingly determining mobile digit is：The number of times of interpolation as needed determines mobile digit.

Such as, current pilot density is 1 RE/RB, and target pilot density is 4RE/RB, IP, need 2 interpolation processings that the lifting of current pilot density is arrived into target pilot density, for Rank 13-24 situations, should use scheme shown in Fig. 4-3 that mobile digit is defined as into 2；For Rank 9-12 situations, then mobile digit can be defined as 1, ensure to be spaced 2 other subframes between two adjacent sub-frames with identical port mapping relationship, detailed process can be found in be introduced above with respect to Rank 13-24 situations, and here is omitted.

In addition, still by taking Rank 13-24 situations as an example, the embodiment of the present invention also needs to do as described below：When mobile digit is 2, subframe 1,4 has identical port mapping relationship, and can carry out interpolation processing to subframe 2,3；Accordingly, when mobile digit is 4, subframe 1,4 also has identical port mapping relationship, and equally can carry out interpolation processing to subframe 2,3, except that, under both of these case, the port mapping relationship of subframe 2,3 is simultaneously differed, and it is bigger to shift former and later two subframes difference, the effect of final channel estimation is better, that is, by contrast, displacement 4 is better than the channel estimation effect of displacement 2.From the above-mentioned scheme that mobile digit is determined according to pilot density lifting demand, when carrying out port mapping displacement, it is the processing carried out by granularity of single subframe, it is used as a kind of preferred scheme, the embodiment of the present invention can also determine a time domain granularity previously according to continuous descending sub frame number, the Doppler frequency shift of data to be transmitted, and on the basis of pilot density lifting demand, mobile digit and the port mapping relationship of each subframe are determined with reference to time domain granularity.

Generally, Doppler frequency shift can reflect the speed of channel time domain change, if Doppler frequency shift very little, that is terminal and base station relative moving speed very little, channel changes very slow in time domain, corresponding to this, we can be handled multiple subframes as an entirety, also i.e. by time domain granularity set it is slightly larger；Conversely, if Doppler frequency shift is larger, can set time domain granularity is slightly smaller, and specific setting of the present invention to time domain granularity can not be limited.

In addition, also to combine the number of sub frames that include of data to be transmitted to determine time domain granularity, i.e., it is also contemplated that whether the subframe that data to be transmitted is included can correctly be divided by time domain granularity.Such as, can according to Doppler frequency shift Time domain granularity is set into 2 (to be handled by entirety of adjacent 2 subframes）Or 3, then when data to be transmitted includes 8 continuous descending sub frames, time domain granularity should be set to 2, because the correct division of 8 continuous descending sub frames can be realized when time domain granularity is 2；When data to be transmitted includes 9 continuous descending sub frames, then time domain granularity can be set to 3.Referring to Fig. 5, the flow chart of end side of embodiment of the present invention pilot frequency collocation method embodiment 1 is shown, it may include：

Whether Walk rapid 201, the antenna terminal mapping relation that terminal receives each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit.

Base station is to before terminal transmission data, the schemes generation dispatch command being described above according to the embodiment of the present invention, then by physical downlink control channel PDCCH, Physical Broadcast Channel PBCH, dispatch command even can be issued to by terminal in high-level signaling mode before transmitting the data.

See above to introduce and understand, if each subframe of data to be transmitted uses identical port mapping relationship, i.e., displacement is not present in the port mapping of each subframe, then dispatch command can be included：Port mapping displacement is not carried out, or, dispatch command can also be included：It is 0 not carry out port mapping displacement, displacement.If each subframe of data to be transmitted uses incomplete same port mapping relationship, i.e., there is displacement in the port mapping of each subframe, then dispatch command is included：Carry out port mapping displacement, specifically move digit.

Walk rapid 202, if the dispatch command represents antenna terminal mapping relation without displacement, terminal then carries out channel estimation using current pilot density.

If the dispatch command that base station is issued represents that each subframe uses identical port mapping relationship, terminal then directly can carry out channel estimation using current pilot density.If it should be noted that being introduced as made above, there is provided the time domain granularity of subframe, then terminal is when carrying out channel estimation, and the independent channel being accomplished that in single time domain granularity is estimated.That is, terminal is using granularity as basic processing unit, if using single subframe as granularity, terminal is accomplished that the channel estimation in single subframe；If using two subframes as granularity, terminal is accomplished that the channel estimation in two subframes, by that analogy, and here is omitted.

Walk rapid 203, if the dispatch command represents that antenna terminal mapping relation is shifted, terminal then carries out interpolation processing according to the multiplexing number of plies and the mobile digit to each subframe, lifts the pilot density of the subframe；Terminal carries out channel estimation using the pilot density after lifting.

If the dispatch command that base station is issued represents that each subframe uses incomplete same port mapping relationship, Terminal will then lift current pilot density by interpolation processing, and carry out channel estimation using the pilot density after lifting.So, when high level data is multiplexed, pilot-frequency expense had not both been resulted in and had been substantially improved, it is ensured that the efficiency of transmission of useful data；Pilot density can also effectively be lifted, it is ensured that the channel estimation precision and data demodulation performance of end side.Specific interpolation processing process can embody as follows：

First, the period of change of port mapping relationship is determined according to the multiplexing number of plies of the specific mobile digit and data transfer that are included in dispatch command, i.e. be spaced several other subframes between two adjacent sub-frames with identical port mapping relationship.

Referring to shown in Fig. 4-2, the 1st subframe has identical port mapping relationship with the 3rd subframe, and a subframe is spaced therebetween（2nd subframe）, period of change can be presented as odd even change, i.e., odd numbered sub-frames have a kind of identical port mapping relationship, and even subframe has another identical port mapping relationship.

Referring to shown in Fig. 4-3, the 1st subframe has identical port mapping relationship with the 4th subframe, and two subframes are spaced therebetween（2nd, 3 subframes）, period of change is 3.

Secondly, utilize two adjacent sub-frames with identical port mapping relationship, it is pointed to other subframes in the middle of the two adjacent sub-frames and enters row interpolation and filtering, obtain extra DMRS estimates, so that the DMRS pilot densities of each port port are lifted in each RB, and then improve the precision that terminal carries out channel estimation.

Referring to shown in Fig. 4-2, the 2nd subframe is different from the port mapping relationship of the 1st, 3 subframes, therefore carries out interpolation processing to the 2nd subframe using the 1st, 3 subframes, the pilot density of the 2nd subframe is lifted one times；Similarly, the 3rd subframe is different from the port mapping relationship of the 2nd, 4 subframes, therefore carries out interpolation processing to the 3rd subframe using the 2nd, 4 subframes, the pilot density of the 3rd subframe is lifted one times；By that analogy, the DMRS pilot densities of each port port in each RB are lifted one times, here is omitted.

Referring to shown in Fig. 4-3, the 2nd, 3 subframes it is different from the port mapping relationship of the 1st, 4 subframes, therefore interpolation processing is carried out to the 2nd, 3 subframes using the 1st, 4 subframes, the pilot density of the 2nd, 3 subframes is lifted one times；Similarly, 3rd, 4 subframes are different from the port mapping relationship of the 2nd, 5 subframes, therefore interpolation processing is carried out to the 3rd, 4 subframes using the 2nd, 5 subframes, the pilot density for making the 3rd, 4 subframes lifts-times, by that analogy, the DMRS pilot densities of each port port in each RB are lifted twice, here is omitted.

It should be noted that interpolation processing process presented hereinabove is the explanation carried out using interpolation method as example, when there was only two continuous descending sub frames or at least three it is continuous under For head and the tail subframe in row subframe, interpolation processing can be realized by extrapolation mode, i.e., the pilot density of another subframe is lifted by way of the corresponding sub-carrier positions horizontal sliding of a subframe, here is omitted.Referring to Fig. 6, the flow chart of end side of embodiment of the present invention pilot frequency collocation method embodiment 2 is shown, it may include：

Whether Walk rapid 301, the antenna terminal mapping relation that terminal receives each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit.

Walk rapid 302, if the dispatch command represents antenna terminal mapping relation without displacement, terminal then carries out channel estimation using current pilot density.

Walk rapid 303, if the dispatch command represents that antenna terminal mapping relation is shifted, terminal then carries out interpolation processing according to the multiplexing number of plies and the mobile digit to each subframe, lifts the pilot density of the subframe；Terminal carries out channel estimation using the pilot density after lifting.

Walk rapid 301 ~ 303 is identical Yu Walk rapid 201 ~ 203, and here is omitted.

Walk rapid 304, terminal demodulates the data to be transmitted that base station is sent using channel estimation value, and demodulation performance is fed back into base station.

No matter terminal is the scheme that Cai Yong Walk rapid 302 are introduced, channel estimation is carried out using current pilot density, or the scheme that Cai Yong Walk rapid 303 are introduced, channel estimation is carried out using the pilot density after lifting, if still because precision of channel estimation not enough causes terminal demodulation performance poor, demodulation performance can be fed back to base station by terminal, in case base station can carry out pilot frequency configuration adjustment accordingly, pass through displacement（For the scheme not shifted）Or the mobile digit of adjustment（For the scheme shifted）Mode improve pilot density, and finally improve precision of channel estimation and terminal demodulation performance.

Pilot frequency configuration scheme based on base station side of the embodiment of the present invention and end side, found by emulating, the present invention program can obtain higher performance gain, it for details, reference can be made to schematic diagram shown in Fig. 7, the MI MO systems configured for 32T32R, shifted by port mapping, after interpolation processing, 5dB BLER (Block Error Ratio, bLock error rate can be obtained）Performance gain, and utilize the convergence raising of the present invention program, more robustness.Corresponding with the above method, the embodiment of the present invention also provides a kind of pilot frequency configuration device.Referring to Fig. 8, the schematic diagram of base station side pilot frequency configuration device of the embodiment of the present invention is shown, it may include： First judging unit 401, for judging whether data to be transmitted has pilot density to lift demand；Mapping position determining unit 402, for when first judging unit is judged to being, determining mapping positions of the demodulated reference signal DMRS in each resource block；

Mapping relations set up unit 403, for the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port；

Second judging unit 404, for judging whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted；

Adding device 405, is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit for the judged result of second judging unit to be added into dispatch command；

Dispensing unit 406, the antenna terminal mapping relation for configuring each subframe according to judged result.

As a kind of example, the mapping position determining unit of the embodiment of the present invention may include：

Frequency domain mapping position determining unit, for determining frequency domain mapping positions of the DMRS in resource block：

Time domain mapping position determining unit, for determining time domain mapping positions of the DMRS in resource block：

L = L'mod2 + 5 ,

Wherein ifn_sMod2=0 indexes for time slot.

if n_sMod2=l is according to the difference for being multiplexed the number of plies, and the DMRS antenna terminal mapping relations that mapping relations set up unit foundation are also different, are specially：

(1) if the multiplexing number of plies is any of 1 ~ 8, given antenna port p is Q.〜Q₇, then the mapping relations set up unit foundation antenna terminal mapping relation be：

_ l, 6, ll pe { Q₂ ,Q₃ ,Q₅,Q₇} '

(2) if the multiplexing number of plies is any of 9 ~ 12, given antenna port p is Q.~ Q, then the mapping relations set up unit foundation antenna terminal mapping relation be：

0,6 pe{Q., Q】, Q₆, Q₉}

K'=^, 10 pe { Q₂, Q₃, Q₇, Q₁₀} ；

, 11 p_e{Q₄, Q₅, Q₈, Q } (3) if the multiplexing number of plies is any of 13 ~ 24, given antenna port p is Q.Then the antenna terminal mapping relation for being to set up member foundation of reflecting is ~ Q：

"

11 p e {Q₁₀ , Q_n , Q₁₇, Q₂₃, to accordingly, the embodiments of the invention provide the specific implementation of two kind of second judging unit, explanation is explained below with embodiment of the method above.

Mode one, second judging unit may include：

Second judgment sub-unit, for judging whether the descending sub frame of the data to be transmitted is at least two continuous descending sub frames, if it is not, then judging antenna terminal mapping relation of the judged result as each subframe without displacement；If it is, judging that the judged result should be shifted as the antenna terminal mapping relation of each subframe；

Mode two, second judging unit may include：

Time domain granularity determining unit, time domain granularity is determined for the continuous descending sub frame number and Doppler frequency shift according to the data to be transmitted；

Mobile digit determining unit, for determining the mobile digit according to pilot density lifting demand and the time domain granularity.

Pilot density lifting demand is obtained in order to accurate, the pilot frequency configuration device of the embodiment of the present invention may also include：Pilot density lifts demand determining unit,

The pilot density lifts demand determining unit, and the demodulation performance for being fed back according to terminal determines the pilot density lifting demand；Or, The pilot density lifts demand determining unit, for determining that the pilot density lifts demand according to current pilot density and target pilot density.Corresponding with the above method, the embodiment of the present invention also provides a kind of pilot frequency configuration device.Referring to Fig. 9, the schematic diagram of end side of embodiment of the present invention pilot frequency configuration device is shown, it may include：

Receiving unit 501, for receiving whether the antenna terminal mapping relation of each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit；

Channel estimating unit 502, for when the dispatch command represents antenna terminal mapping relation without displacement, channel estimation to be carried out using current pilot density；

Interpolation process unit 503, for when the dispatch command represents that antenna terminal mapping relation has carried out displacement, carrying out interpolation processing to each subframe according to the multiplexing number of plies and the mobile digit, lifting the pilot density of the subframe；

The channel estimating unit 502, is additionally operable to the pilot density after the lifting using interpolation process unit output and carries out channel estimation.

It is preferred that, if after using the present invention program, end side also has the problem of precision of channel estimation is inadequate, then the pilot frequency configuration device of the embodiment of the present invention can also be on the basis of schematic diagram shown in Fig. 8, and Jin mono- Walk include：

In this way, base station can carry out pilot frequency configuration adjustment accordingly after the demodulation performance of terminal transmission is received, pilot density is improved by way of shifting or adjusting mobile digit, and finally improves the precision of channel estimation and demodulation performance of terminal.

Jin mono- Walk, the embodiment of the present invention additionally provides base station side pilot frequency configuration device and the hardware of end side pilot frequency configuration device is constituted.Referring to Figure 10, it may include at least one processor（Such as CPU), at least one network interface or other communication interfaces, memory, and at least one communication bus, for realizing the connection communication between these devices.Processor is used to perform the executable module stored in memory, such as computer program.Memory may include high-speed random access memory（RAM：Random Access Memory), it is also possible to also including non-labile memory（Non-volatile memory), for example, at least one magnetic disk storage.Pass through at least one network interface（Can be wired or wireless）Realize that this is The communication connection united between gateway and at least one other network element, can use internet, wide area network, LAN, Metropolitan Area Network (MAN) etc..

Corresponding to base station side pilot frequency configuration device, the processor be used for according to described program instruction perform Yi Xia Walk it is rapid：

Specifically, the processor determines mapping positions of the DMRS in each resource block in such a way：

Wherein, it is the frequency domain scale of resource block,！！Indexed for resource block, K' is subcarrier 0,1,5,6,10,11；

Time domain mapping positions of the DMRS in resource block： L = L'mod2 + 5 ,

if n_smod2

Wherein, L' is time slot Suo Gong

If n mod2 specifically, the mapping relations that the processor is set up between the subframe of data to be transmitted first and given antenna port in such a way：

If it is any of 1 ~ 8 to be multiplexed the number of plies, given antenna port p is Q.~ Q₇, then antenna terminal mapping relation be：

If it is any of 9 ~ 12 to be multiplexed the number of plies, given antenna port p is Q.Q, then antenna terminal mapping relation be： If it is any of 13 ~ 24 to be multiplexed the number of plies, given antenna port p is Q.~Q₂₃, then antenna terminal mapping relation be：

I pe{Q₂ ,Q₃ ,Q₁₃,Q₁₉}

κ,= 5 pe{Q₄ ,Q₅ ,Q₁₄,Q₂₀}

" 6 pe{Q₆, Q₇, Q₁₅, Q₂₁} °

10 pe{Q₈, Q₉, Q₁₆, Q₂J

II pe{Q₁₀ ,Q_n ,Q₁₇,Q₂₃Specifically, the processor judges whether each subframe uses identical antenna terminal mapping relation in such a way：

Specifically, the processor determines the mobile digit in such a way：

Specifically, the processor determines the pilot density lifting demand in such a way：The demodulation performance fed back according to terminal determines the pilot density lifting demand；Or,

Corresponding to end side pilot frequency configuration device, the processor be used for according to described program instruction perform Yi Xia Walk it is rapid：

Whether the antenna terminal mapping relation for receiving each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit；

If the dispatch command represents antenna terminal mapping relation without displacement, processor then carries out channel estimation using current pilot density；

It is preferred that, the processor be additionally operable to perform Yi Xia Walk it is rapid： The data to be transmitted that base station is sent is demodulated using channel estimation value, and demodulation performance is fed back into base station.As seen through the above description of the embodiments, those skilled in the art can be understood that full portions or Bu Fen Walk can add the mode of required general hardware platform to realize by software suddenly in above-described embodiment method.Understood based on such, the part that technical scheme substantially contributes to prior art in other words can be embodied in the form of software product, the computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are to cause a computer equipment（Can be network communication equipments such as personal computer, server, or WMG, etc.）Perform the method described in some parts of each embodiment of the invention or embodiment.

It should be noted that each embodiment in this specification is described by the way of progressive, identical similar part is mutually referring to what each embodiment was stressed is the difference with other embodiment between each embodiment.For equipment and system embodiment, because it is substantially similar to embodiment of the method, so describing fairly simple, the relevent part can refer to the partial explaination of embodiments of method.Equipment and system embodiment described above is only schematical, the unit wherein illustrated as separating component can be or may not be physically separate, the part shown as unit can be or may not be physical location, a place can be located at, or can also be distributed on multiple NEs.Some or all of module therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.Those of ordinary skill in the art are without creative efforts, you can to understand and implement.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.Any modification, equivalent substitution and improvements made within the spirit and principles of the invention etc., are all contained in protection scope of the present invention.

Claims

Claim

1st, a kind of pilot frequency configuration device, it is characterised in that described device includes：

First judging unit, for judging whether data to be transmitted has pilot density to lift demand；Mapping position determining unit, for when first judging unit is judged to being, determining mapping positions of the demodulated reference signal DMRS in each resource block；

Mapping relations set up unit, for the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port；

Second judging unit, for judging whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted；

Adding device, is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit for the judged result of second judging unit to be added into dispatch command；

Dispensing unit, the antenna terminal mapping relation for configuring each subframe according to judged result.

2nd, device according to claim 1, it is characterised in that the mapping position determining unit includes

Frequency domain mapping position determining unit, for determining frequency domain mapping positions of the DMRS in resource block：

K = N^n_{PRB +}K', wherein, it is the frequency domain scale of resource block,！！Indexed for resource block, K' is subcarrier 0,1,5,6,10,11；

Time domain mapping position determining unit, for determining time domain mapping positions of the DMRS in resource block：

L = L'mod2 + 5 ,

Sweet rh_T, i⁰'¹ if n_smod2 = 0 _n .

Wherein, L'=, n_sIndexed for time slot.

[2,3 if n_smod2 = l ^s

3rd, device according to claim 1, it is characterised in that

If it is any of 1 ~ 8 to be multiplexed the number of plies, given antenna port p is Q.~Q₇, then the mapping relations set up unit foundation antenna terminal mapping relation be：

_K, J0,5,10 ·

_ l, 6, ll₂ ,Q₃ ,Q₅,Q₇' if the multiplexing number of plies is any of 9 ~ 12, given antenna port p is Q.Q, then the mapping relations set up unit foundation antenna terminal mapping relation be：

K' 10 pe{Q₂, Q₃, Q₇, Q

11 e{Q₄-Q₅ -Q₈-Q₁

If it is any of 13 ~ 24 to be multiplexed the number of plies, given antenna port p is Q Q₂₃, then the mapping relations set up unit foundation antenna terminal mapping relation be：

0 p

1 P e{Q₂, Q₃, Q₁₃, Q_1;

5 p e{Q₄, Q₅, Q₁₄, Q_2C

K'

6 p e{Q₆, Q₇, Q₁₅, Q_2]

10 p e{Q₈, Q₉, Q₁₆, Q_2:

11 p Q₁₀, Q, Q₁₇, Q

4th, device according to claim 1, it is characterised in that second judging unit includes：Second judgment sub-unit, for judging whether the descending sub frame of the data to be transmitted is at least two continuous descending sub frames, if it is not, then judging antenna terminal mapping relation of the judged result as each subframe without displacement；If it is, judging that the judged result should be shifted as the antenna terminal mapping relation of each subframe；

Mobile digit determining unit, for when second judgment sub-unit is judged to being, lifting demand according to the pilot density and determining the mobile digit.

5th, device according to claim 4, it is characterised in that second judging unit is included also：Time domain granularity determining unit, time domain granularity is determined for the continuous descending sub frame number and Doppler frequency shift according to the data to be transmitted；

The mobile digit determining unit, for determining the mobile digit according to pilot density lifting demand and the time domain granularity.

6th, the device according to any one of claim 1 ~ 5, it is characterised in that the pilot frequency configuration device also includes：Pilot density lifts demand determining unit,

The pilot density lifts demand determining unit, and the demodulation performance for being fed back according to terminal determines the pilot density lifting demand；Or,

The pilot density lifts demand determining unit, for determining that the pilot density lifts demand according to current pilot density and target pilot density.

7th, a kind of pilot frequency configuration device, it is characterised in that described device includes： Receiving unit, for receiving whether the antenna terminal mapping relation of each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit；

Channel estimating unit, for when the dispatch command represents antenna terminal mapping relation without displacement, channel estimation to be carried out using current pilot density；

Interpolation process unit, for when the dispatch command represents that antenna terminal mapping relation has carried out displacement, carrying out interpolation processing to each subframe according to the multiplexing number of plies and the mobile digit, lifting the pilot density of the subframe；

The channel estimating unit, is additionally operable to the pilot density after the lifting using interpolation process unit output and carries out channel estimation.

8th, device according to claim 7, it is characterised in that described device also includes：Feedback unit, for demodulating the data to be transmitted that base station is sent using channel estimation value, and feeds back to base station by demodulation performance.

9th, a kind of pilot frequency collocation method, it is characterised in that methods described includes：

Base station judges whether data to be transmitted has pilot density to lift demand, if, then determine mapping positions of the demodulated reference signal DMRS in each resource block, and the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port；

Base station judges whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted, and will determine that result is added to dispatch command and is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit；

Base station configures the antenna terminal mapping relation of each subframe according to judged result.

10th, method according to claim 9, it is characterised in that the determination DMRS each resource block mapping position, including：

Frequency domain mapping positions of the DMRS in resource block： K = N^n_{PRB +} K' ,

Wherein, it is the frequency domain scale of resource block,！！Indexed for resource block, K' is subcarrier 0,1,5,6,10,11；

Time domain mapping positions of the DMRS in resource block： L = L'mod2 + 5 ,

Sweet if n_smod2 = 0

Wherein, L'=, n_sIndexed for time slot.

[2,3 if n_smod2 = l

11st, method according to claim 9, it is characterised in that described to be set up according to the multiplexing number of plies Mapping relations between the subframe of data to be transmitted first and given antenna port, including：

If it is any of 1 ~ 8 to be multiplexed the number of plies, given antenna port p is Q.〜Q₇, then antenna terminal mapping relation be：

_K,=0,5,10 ·

_ l, 6, ll₂ ,Q₃ ,Q₅,Q₇' if the multiplexing number of plies is any of 9 ~ 12, given antenna port p is Q.~ Q, then antenna terminal mapping relation be：

" 0,6 pe { Q., Q】, Q₆, Q₉}

K'1,10 pe { Q₂, Q₃, Q₇, Q₁₀} ；

5,11 p_e{Q₄, Q₅, Q₈, Q } if the multiplexing number of plies is any of 13 ~ 24, given antenna port p is Q.〜Q₂₃, then antenna terminal mapping relation be：

12nd, method according to claim 9, it is characterised in that the base station judges whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted, including：Whether the descending sub frame for judging the data to be transmitted is at least two continuous descending sub frames, if it is, the judged result should be shifted for the antenna terminal mapping relation of each subframe, and determines the mobile digit according to pilot density lifting demand；Otherwise, the judged result is the antenna terminal mapping relation of each subframe without displacement.

13rd, method according to claim 12, it is characterised in that described that the mobile digit is determined according to pilot density lifting demand, including：

Time domain granularity is determined according to the continuous descending sub frame number and Doppler frequency shift of the data to be transmitted, and the mobile digit is determined according to pilot density lifting demand and the time domain granularity.

14th, the method according to any one of claim 9 ~ 13, it is characterised in that determine that the mode that the pilot density lifts demand is： The demodulation performance that base station is fed back according to terminal determines the pilot density lifting demand；Or, base station determines that the pilot density lifts demand according to current pilot density and target pilot density.

15th, a kind of pilot frequency collocation method, it is characterised in that methods described includes：

Whether the antenna terminal mapping relation that terminal receives each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit；

If the dispatch command represents antenna terminal mapping relation without displacement, terminal then carries out channel estimation using current pilot density；

If the dispatch command represents that antenna terminal mapping relation is shifted, terminal then carries out interpolation processing according to the multiplexing number of plies and the mobile digit to each subframe, lifts the pilot density of the subframe；Terminal carries out channel estimation using the pilot density after lifting.

16th, method according to claim 15, it is characterised in that methods described also includes：Terminal demodulates the data to be transmitted that base station is sent using channel estimation value, and demodulation performance is fed back into base station.

17th, a kind of pilot frequency configuration device, it is characterised in that described device includes：At least one processor, memory and at least one communication bus,

The communication bus, for realizing the connection communication between at least one processor and the memory；

The memory for storage program instruct, the processor be used for according to described program instruction perform Yi Xia Walk it is rapid：

Judge whether data to be transmitted has pilot density to lift demand, if it is, mapping positions of the demodulated reference signal DMRS in each resource block is determined, and the mapping relations set up according to the multiplexing number of plies between the subframe of data to be transmitted first and given antenna port；

Judge whether each subframe uses identical antenna terminal mapping relation according to the continuous descending sub frame number of data to be transmitted, and will determine that result is added to dispatch command and is issued to whether the antenna terminal mapping relation comprising each subframe in terminal, the dispatch command shifts and mobile digit；

The antenna terminal mapping relation of each subframe is configured according to judged result.

18th, device according to claim 17, it is characterised in that the processor determines mapping positions of the DMRS in each resource block in such a way：

Frequency domain mapping positions of the DMRS in resource block： K = N^n_{PRB +} K' , Wherein, it is the frequency domain scale of resource block, η indexes for resource block, K' is subcarrier 0,1. 5,6,10,11；

Time domain mapping positions of the DMRS in resource block： L = L'mod2 + 5 ,

0,1 if n_smod2 = 0

Wherein, L' is time slot rope^;

I 2,3 if n mod2 = l

19th, device according to claim 17, it is characterised in that the mapping relations that the processor is set up between the subframe of data to be transmitted first and given antenna port in such a way：

If it is any of 1 ~ 8 to be multiplexed the number of plies, given antenna port ρ is Q.〜Q₇, then antenna terminal mapping relation be：

_ l, 6, ll pe { Q₂ ,Q₃ ,Q₅,Q₇' if the multiplexing number of plies is any of 9 ~ 12, given antenna port p is Q.Q, then antenna terminal mapping relation be：

0,6 pe { Q., Q】, Q₆, Q₉}

Pe { the Q of K'=1,10₂, Q₃, Q₇, Q₁₀} ；

5,11 pe { Q₄ ,Q₅ ,Q₈,Q_nIf multiplexing the number of plies be any of 13 ~ 24, given antenna port p be Q.~Q₂₃, then antenna terminal mapping relation be：

1 pe{Q₂, Q₃, Q₁₃, Q₁₉}

5 pe{Q₄, Q₅, Q₁₄, Q₂。}

K'

6 pe{Q₆ ,Q₇ ,Q₁₅,Q₂₁} °

10 pe{Q₈, Q₉, Q₁₆, Q₂J

11 p_e{Q₁₀, Q, Q₁₇, Q₂₃}

20th, device according to claim 17, it is characterised in that the processor judges whether each subframe uses identical antenna terminal mapping relation in such a way：

Whether the descending sub frame for judging the data to be transmitted is at least two continuous descending sub frames, if it is, the judged result should be shifted for the antenna terminal mapping relation of each subframe, and determines the mobile digit according to pilot density lifting demand；Otherwise, the judged result is the antenna terminal mapping relation of each subframe without displacement. 21st, device according to claim 20, it is characterised in that the processor determines the mobile digit in such a way：

Time domain granularity is determined according to the continuous descending sub frame number and Doppler frequency shift of the data to be transmitted, and the mobile digit is determined according to pilot density lifting demand and the time domain granularity.

22nd, the device according to any one of claim 17 ~ 21, it is characterised in that the processor determines the pilot density lifting demand in such a way：

The demodulation performance fed back according to terminal determines the pilot density lifting demand；Or,

The pilot density lifting demand is determined according to current pilot density and target pilot density.

23rd, a kind of pilot frequency configuration device, it is characterised in that described device includes：At least one processor, memory and at least one communication bus,

The communication bus, for realizing the connection communication between at least one processor and the memory；

The memory for storage program instruct, the processor be used for according to described program instruction perform Yi Xia Walk it is rapid：

Whether the antenna terminal mapping relation for receiving each subframe comprising data to be transmitted in the dispatch command that base station is issued, the dispatch command shifts and mobile digit；

If the dispatch command represents antenna terminal mapping relation without displacement, processor then carries out channel estimation using current pilot density；

If the dispatch command represents that antenna terminal mapping relation is shifted, processor then carries out interpolation processing according to the multiplexing number of plies and the mobile digit to each subframe, lifts the pilot density of the subframe；Processor carries out channel estimation using the pilot density after lifting.

24th, device according to claim 23, it is characterised in that the processor be additionally operable to perform Yi Xia Walk it is rapid：

The data to be transmitted that base station is sent is demodulated using channel estimation value, and demodulation performance is fed back into base station.