CN105827382A - Reference signal mapping method and device - Google Patents

Abstract

The invention discloses a reference signal mapping method and device. The method comprises that during coordinated multi-point transmission, each cell uses a cell ID of a main service cell to generate a reference signal sequence in the resource of coordinated transmission, and the reference signal sequence is a DMRS (Demodulation Reference Signal) sequence; and the generated reference signal sequence is mapped. According to the invention, the compatibility between reference signal mapping and coordinated transmission is improved, and further the performance of coordinated transmission is improved.

Description

Reference signal mapping method and device

The application is to Application No.: 201010502535.0, filing date: on 09 29th, 2010, the divisional application of the original application of invention entitled " reference signal mapping method and device ".

Technical field

The present invention relates to the communications field, in particular to a kind of reference signal mapping method and device.

Background technology

High-order multi-antenna technology is one of key technology of senior Long Term Evolution (LongTermEvolutionAdvanced, referred to as LTE-A) system, and in order to improve system transfer rate, senior Long Term Evolution can also be expressed as LTE-Advanced.In order to realize the channel quality measurement after introducing high-order multi-antenna technology and data demodulation, lte-a system respectively defines two class reference signals: demodulated reference signal (DemodulationReferenceSignal, referred to as DMRS) and channel quality measurement reference signal (ChannelStateInformation-ReferenceSignal, referred to as CSI-RS), wherein, DMRS is for the demodulation of Physical Downlink Shared Channel (PhysicalDownlinkSharedChannel, referred to as PDSCH).For channel condition information (channelstateinformation, referred to as CSI) CSI-RS that measures, it indicates (ChannelQualityIndicator for channel quality, referred to as CQI), pre-coding matrix instruction (PrecodingMatrixIndicator, referred to as PMI), the reporting of the information such as stratum's instruction (RankIndicator, referred to as RI).The new technical feature of the LTE-A such as above-mentioned two class reference signals may be used for supporting such as multipoint cooperative (CoordinatedMulti-Point, referred to as CoMP), spatial reuse.

In LTE, use public reference signal (CommonReferenceSignalorCellSpecificReferenceSignal, referred to as CRS) and carry out pilot measurement, i.e. all users use CRS to carry out channel estimation.When using this CRS, the concrete pretreatment mode that the data needing transmitting terminal additional notifications receiving terminal to be launched have employed, and also the expense of pilot tone is bigger.Additionally in multi-user's multiple-input and multiple-output (Multi-userMulti-inputMulti-output, referred to as MU-MIMO), owing to multiple terminals use identical CRS, it is impossible to realize the orthogonal of pilot tone, be therefore unable to estimate interference.

In LTE-A, in order to reduce the expense of pilot tone, divide to open by CSI-RS and DMRS and be designed, owing to DMRS uses identical pretreatment mode with data, simultaneously according to the available order information of scheduling user's respective channels, map DMRS, therefore can adjust the expense of pilot tone adaptively according to order information, so in the situation that order is relatively low, the expense of pilot tone can be substantially reduced.The feature of DMRS signal includes: (1) DMRS signal is that terminal is distinctive, such as: the data acquisition of DMRS corresponding to particular terminal and scheduling user is by identical precoding processing；(2) DMRS signal is merely present in network side, if enhanced base station (eNB) is on the resource scheduled in data are transmitted and layer；(3) from the point of view of network side, on different layers, the DMRS of transmission is mutually orthogonal.

At present at normal (NormalCyclicPrefix, referred to as NormalCP) and extended cyclic prefix in the case of, the pattern that the most defined DMRS maps, Fig. 1 is according to the mapping pattern schematic diagram one of DMRS under the normal cyclic prefix of correlation technique, as shown in Figure 1, when order (rank) is 1～2, use in Fig. 1Shown Resource Unit carries out the mapping of DMRS, and the pilot tone of the port of two layer (layer) correspondences carries out code book multiplexing by orthogonal mask (OrthogonalCoverCode, the referred to as OCC) code of a length of 2；When rank is 3～4, on the basis of rank is 1～2, by the mode of frequency division multiplexing (FrequencyDividedMultiplexing, referred to as FDM), increaseOne group of shown Resource Unit, wherein { 0,1} layer is correspondingShown Resource Unit, { 2,3} layers are correspondingShown Resource Unit, and the pilot tone of the layer corresponding ports of each group all carries out code division multiplexing with the OCC of a length of 2 in time domain；When rank is 5～8, Resource Unit identical when being 3～4 with rank is used to carry out the mapping of pilot tone, its middle level 0, and Isosorbide-5-Nitrae, 6} correspondenceShown Resource Unit, { 2,3,5,7} is corresponding for layerShown Resource Unit, and use the OCC of a length of 4 to carry out code division multiplexing in time domain, in Fig. 1, the Resource Unit in same rectangle frame (ResourceElement, referred to as RE) represents the RE carrying out code division multiplexing.It should be noted that Fig. 1 is to illustrate as a example by a Physical Resource Block (PhysicalResourceBlock, referred to as PRB), the mapping position in different PRB is identical.It should be noted that as rank > 2 time, layer i and port i+7 one_to_one corresponding, in description below, no longer reaffirm.Fig. 2 and Fig. 3 is the DMRS mapping pattern during special subframe of DwPTS.Wherein, in figureRepresent public reference signal；In Fig. 2～Fig. 3, legendRepresent protection interval.Wherein, this special subframe refers to: for the subframe of uplink/downlink switching in time division duplex (TDD) system.

Proposing in correlation technique in LTER9 and R10 that the production method of DMRS sequence is in the case of normal prefix (normalCP) and expanded prefix (extendedCP), the mapping mode of DMRS is:

Normal CP (cyclicprefix):

$r\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c(2m\left)\right)+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1\left)\right),m=0,1,...,12\·N_{RB}^{\max ,DL}-1;$

WhereinRepresenting the resource block number that maximum system bandwidth is corresponding, c (i) is pseudo-random sequence.

And when sequence mapping, in current 3GPP36.211 agreement, during normal CP, shown in the relation equation below of the DMRS of different port and sequence of mapping

$a_{k,l}^{\left(p\right)}=s\·r(3\·l^{\′}\·N_{RB}^{\max ,DL}+3\·n_{PRB}+m^{\′})$

Wherein s represents the spread spectrum code value that corresponding ports is corresponding on different RE, r is reference signal sequence, l' represents the OFDM symbol index (which individual OFDM symbol that there is DMRS) of DMRS in a subframe, when normal cyclic prefix, the OFDM symbol value of corresponding different placement DMRS is respectively l'=0,1,2,3.M' corresponding to a Resource Block a DMRSOFDM symbol on DMRS Resource Unit location index, when normal cyclic prefix, m'=0,1,2.K represents the frequency domain position needing to map DMRS, and l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot.P represents port sequence number corresponding for DMRS.n_PRBRepresenting Resource Block index, its span isWhereinRepresent the resource block number that current system bandwidth is corresponding.

Mapping modes based on the 36.211 DMRS sequences described, in the case of different bandwidth, corresponding sequence location interception way is as shown in Figure 4, in this manner, at collaboration diversity (CoordinatedMulti-pointtransmission/reception, referred to as CoMP) in carry out the Performance comparision of joint transmission (JointTransmission, referred to as JT) poor.

Meanwhile, according to existing DMRS sequence producing method, being produced as of the DMRS sequence of different districtsThen the DMRS sequence of different districts is different, causes the transmission performance of CoMPJT to be deteriorated.

Summary of the invention

Present invention is primarily targeted at a kind of reference signal mapping method of offer and device, to solve the problem that the method that in correlation technique, reference signal maps causes the Performance comparision difference of cooperation transmission.

To achieve these goals, according to an aspect of the invention, it is provided a kind of reference signal mapping method.

Reference signal mapping method according to the present invention includes: use maximum system bandwidth to generate reference signal sequence；The reference sequences choosing mapping in the reference signal sequence generated maps, wherein, and the reference signal sequence that the reference sequences of mapping is corresponding on identical resource location when being maximum system bandwidth.

To achieve these goals, according to another aspect of the present invention, a kind of reference signal mapping method is additionally provided.

Reference signal mapping method according to the present invention includes: when carrying out multi-point coordinated joint transmission, in the resource of joint transmission, each community uses the cell ID of main Serving cell to generate reference signal sequence, and wherein, reference signal sequence is demodulated reference signal DMRS；The reference signal sequence of generation is mapped.

To achieve these goals, according to a further aspect of the invention, a kind of reference signal mapping device is additionally provided.

Reference signal mapping device according to the present invention includes: the first generation module, is used for using maximum system bandwidth to generate reference signal sequence；Mapping block, maps for choosing the reference sequences of mapping in the reference signal sequence generated, wherein, and the reference signal sequence that the reference sequences of mapping is corresponding on identical resource location when being maximum system bandwidth.

To achieve these goals, according to a further aspect of the invention, a kind of reference signal mapping device is additionally provided.

Reference signal mapping device according to the present invention, described device is positioned in each community carrying out multi-point coordinated joint transmission, including: the second generation module, for when carrying out multi-point coordinated joint transmission, in the resource of joint transmission, the cell ID using main Serving cell generates reference signal sequence, and wherein, reference signal sequence is demodulated reference signal DMRS sequence；Sequence mapping module, for mapping the reference signal sequence of generation.

By the present invention, use and use maximum system bandwidth to generate reference signal sequence.The reference sequences choosing mapping in the reference signal sequence generated maps, wherein, reference signal sequence corresponding on identical resource location when the reference sequences mapped is maximum system bandwidth, solve the method that reference signal in correlation technique maps cause carrying out in collaboration diversity cooperation transmission Performance comparision difference problem, thus improve reference signal and map the compatibility with collaboration diversity, and then improve the effect of the joint transmission performance of collaboration diversity.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is according to the mapping pattern schematic diagram one of DMRS under the normal cyclic prefix of correlation technique；

Fig. 2 is according to the mapping pattern schematic diagram two of DMRS under the normal cyclic prefix of correlation technique；

Fig. 3 is according to the mapping pattern schematic diagram three of DMRS under the normal cyclic prefix of correlation technique；

Fig. 4 is according to the schematic diagram of DMRS sequence mapping mode under different bandwidth in the LTE system of correlation technique；

Fig. 5 is the first pass figure of reference signal mapping method according to embodiments of the present invention；

Fig. 6 is the schematic diagram of mapping mode under different bandwidth of DMRS sequence according to embodiments of the present invention；

Fig. 7 is the second flow chart of reference signal mapping method according to embodiments of the present invention；

Fig. 8 is the schematic diagram of mapping mode in CoMP joint transmission of DMRS sequence according to embodiments of the present invention；

Fig. 9 is the first structured flowchart of reference signal mapping device according to embodiments of the present invention；

Figure 10 is preferred first structured flowchart of reference signal mapping device according to embodiments of the present invention；And

Figure 11 is the second structured flowchart of reference signal mapping device according to embodiments of the present invention.

Detailed description of the invention

Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.

Present embodiments providing a kind of reference signal mapping method, Fig. 5 is the first pass figure of reference signal mapping method according to embodiments of the present invention, as it is shown in figure 5, the method includes:

Step S502: use maximum system bandwidth to generate reference signal sequence.

Step S504: the reference sequences choosing mapping in the reference signal sequence generated maps, wherein, the reference signal sequence that the reference sequences of mapping is corresponding on identical resource location when being maximum system bandwidth.

Pass through above-mentioned steps, maximum system bandwidth is used to generate reference signal sequence, and reference signal sequence corresponding on identical resource location maps when choosing maximum system bandwidth in the sequence, make, in same asset position, there is identical reference signal, the problem avoiding the Performance comparision difference using the reference signal mapping method in correlation technique to cause reference signal in the joint transmission of cooperation inconsistent and to cause, thus improve reference signal and map the compatibility with cooperation transmission, and then improve the performance of cooperation joint transmission.

Preferably, reference signal sequence includes DMRS sequence or CSI-RS sequence.

Preferably, in the subframe of normal prefix normalCP, reference signal sequence is DMRS sequence, and step S504 includes: the reference sequences using below equation to choose mapping in the reference signal sequence generated maps:

Wherein,Represent the reference signal that pth port is corresponding on the kth subcarrier of the l orthogonal frequency division multiplex OFDM symbol, the most here l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, s represents the spread spectrum code value of corresponding DMRS port, r is reference signal sequence, l' represents the notation index of the OFDM of DMRS in a subframe, and l'=0,1,2,3For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding, n_PRBRepresenting Resource Block index, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, m'=0,1,2.Passing through the preferred embodiment, it is achieved that in the subframe of normal prefix normalCP, reference signal sequence is the mapping of DMRS sequence, thus improves reference signal and map the compatibility with cooperation transmission, and then improves the performance of cooperation transmission.

Preferably, in the normal sub-frames of expanded prefix (extentCP), reference signal sequence is DMRS sequence, and step S504 includes: the reference sequences using below equation to choose mapping in the reference signal sequence generated maps:

Wherein,Represent reference signal corresponding on pth port kth subcarrier on the l orthogonal frequency division multiplex OFDM symbol, wherein l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, s represents the spread spectrum code value of corresponding DMRS port, r is pilot frequency sequence, and l' represents the notation index of the OFDM of DMRS in a subframe, and l'=0,1,2,3For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding, n_PRBRepresenting Resource Block index, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, m'=0,1,2.Passing through the preferred embodiment, it is achieved that in the normal sub-frames of expanded prefix extentCP, reference signal sequence is the mapping of DMRS sequence, thus improves reference signal and map the compatibility with cooperation transmission, and then improves the performance of cooperation transmission.

Preferably, in the special subframe of expanded prefix (extentCP), reference signal sequence is DMRS sequence, and step S504 includes: the reference sequences using below equation to choose mapping in the reference signal sequence generated maps:

Wherein,Represent reference sequences corresponding on pth port kth subcarrier on the l orthogonal frequency division multiplex OFDM symbol, the most here l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, s represents the spread spectrum code value of corresponding DMRS port, r is reference signal sequence, l' represents the notation index of the OFDM of DMRS in a subframe, and l'=0,1For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding, n_PRBRepresenting Resource Block index, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, m'=0,1,2.Passing through the preferred embodiment, it is achieved that in the special subframe of expanded prefix extentCP, reference signal sequence is the mapping of DMRS sequence, thus improves reference signal and map the compatibility with cooperation transmission, and improves the performance of cooperation transmission.

Preferably, reference signal sequence is CSI-RS sequence, chooses the reference sequences of mapping and carries out mapping and include: the reference sequences using below equation to choose mapping in the reference signal sequence generated maps in the reference signal sequence generated:

Wherein,Represent reference signal corresponding on pth port kth subcarrier on the l OFDM (OFDM) symbol, wherein l represents that the OFDM symbol placing CSI-RS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to CSI-RS in the OFDM symbol exist CSI-RS, l and k value is determined by CSI-RS pattern, s represents the spread spectrum code value of corresponding CSI-RS port, r is reference signal sequenceL' represents the notation index that there is measuring reference signals,For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding.Pass through the preferred embodiment, it is achieved that reference signal sequence is the mapping of CSI-RS sequence, thus improve reference signal and map the compatibility with cooperation transmission, and then improve the performance of cooperation transmission.

Fig. 6 is the schematic diagram of mapping mode under different bandwidth of DMRS sequence according to embodiments of the present invention, and as shown in Figure 6, under current system bandwidth, the sequence of each RB is identical with the sequence of corresponding RB in same frequency position under maximum bandwidth.Illustrating real system in Fig. 6 isSystem bandwidth, and maximum system bandwidth isTime, the relation of reference signal sequence in two systems.In this schematic diagram,System withMid frequency position corresponding to system is identical, nowReference signal corresponding to system needsSystem is in the intercepting of same frequency position reference signal sequence.Sequence corresponding on each RB in system withThe sequence of system correspondence frequency domain position is identical.

It should be noted that the same frequency position referring to baseband signal on above-mentioned same frequency position, above-mentioned in reference signal can be demodulated reference signal, it is also possible to for measuring reference signals.

Embodiment one

The present embodiment combines above-described embodiment and preferred implementation therein, this embodiment offers the mapping method of a kind of reference signal, in this embodiment, it is achieved that the concrete mapping method of demodulated reference signal during normal CP, the method comprises the steps:

Step 1: use the production method of DMRS sequence in LTE to produce DMRS sequence according to formula (1), the length of DMRS sequence is to produce according to maximum system bandwidth, and system maximum bandwidth passes through RB numberCharacterize.

$r\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c(2m\left)\right)+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1\left)\right),m=0,1,...,12N_{RB}^{\max ,DL}-1---\left(1\right)$

Wherein, c (i) is pseudo-random sequence, it should be noted that the process producing pseudo-random sequence is identical with system pseudo-random series producing method in existing LTE.

Step 2: be demodulated the mapping of reference signal, Resource Block n_PRBOn demodulated reference signal mapping mode according to mapping.This mapping method can pass through formula (2) and represent:

Wherein,Represent reference signal corresponding on pth port kth subcarrier on the l OFDM (OFDM) symbol, the most here l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, s represents the spread spectrum code value of corresponding DMRS port, l' represents the OFDM symbol index of DMRS in a subframe, for normal cyclic prefix, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, and m'=0, 1, 2；Represent the resource block number that maximum system bandwidth is corresponding；The number of the Resource Block that expression current system bandwidth is corresponding.

Embodiment two

The present embodiment combines above-described embodiment and preferred implementation therein, this embodiment offers the mapping method of a kind of reference signal, in this embodiment, it is achieved that the concrete mapping method of demodulated reference signal during extension CP, the method comprises the steps:

Step 1: during extended cyclic prefix, the production method of DMRS sequence produces DMRS sequence according to formula (3), and the length of sequence is to produce according to maximum system bandwidth, and system maximum bandwidth passes through RB numberCharacterize.

For normal sub-frames:

$r\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c(2m\left)\right)+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1\left)\right),m=0,1,...,16N_{RB}^{\max ,DL}-1---\left(3\right)$

Special subframe for TDD system:

$r\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c(2m\left)\right)+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1\left)\right),m=0,1,...,8N_{RB}^{\max ,DL}-1---\left(4\right)$

Wherein c (i) is pseudo-random sequence, in LTE, identical with existing system pseudo-random series producing method.

Step 2, is demodulated the mapping of reference signal, Resource Block n_PRBOn demodulated reference signal mapping mode according to mapping.It is formulated as shown in formula (5).

Represent reference signal corresponding on pth port kth subcarrier on the l OFDM (OFDM) symbol, the most here l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, s represents the spread spectrum code value of corresponding DMRS port, r is reference signal sequence, l' represents the orthogonal frequency division multiplex OFDM notation index of DMRS in a subframe, for normal sub-frames, l'=0, 1, 2, 3, for special subframe, l'=0, 1, n_PRBRepresenting Resource Block index, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, and m'=0,1,2；Represent the resource block number that maximum system bandwidth is corresponding；The number of the Resource Block that expression current system bandwidth is corresponding, for extended cyclic prefix m'=0,1,2,3.

Embodiment three

The present embodiment combines above-described embodiment and preferred implementation therein, this embodiment offers the mapping method of a kind of reference signal, in this embodiment, it is achieved that the concrete mapping method of CSI-RS, the method comprises the steps:

Step 1: measuring reference signals sequence produces and produces according to formula (6) formula, and the length of sequence determines also according to maximum system bandwidth.

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c(2m\left)\right)+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1\left)\right),m=0,1,...,2N_{RB}^{\max ,DL}-1---\left(6\right)$

Step 2, maps measuring reference signals.When mapping, under current system bandwidth, the sequence of each RB is identical with the sequence of corresponding RB in same frequency position under maximum bandwidth, specifically maps as shown in Equation 7:.

$a_{k,l}^{\left(p\right)}=s\·r(l^{\′}\·N_{RB}^{\max ,DL}+m^{\′})---\left(7\right)$

Wherein,Represent reference signal corresponding on pth port kth subcarrier on the l OFDM (OFDM) symbol, the most here l represents that the OFDM symbol placing CSI-RS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to CSI-RS in the OFDM symbol exist CSI-RS, l and k value is determined by CSI-RS pattern, s represent corresponding CSI-RS port spread spectrum code value, r is reference signal (CSI-RS) sequenceL' represents the notation index OFDM symbol of measuring reference signals (which exist) that there is measuring reference signals, l'=0,1,For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding.

Embodiment four

Present embodiments providing demodulated reference signal mapping method in a kind of cooperation transmission, Fig. 7 is the second flow chart of reference signal mapping method according to embodiments of the present invention, as it is shown in fig. 7, the method includes:

Step S702: when carrying out CoMP joint transmission, uses the cell ID of main Serving cell to generate reference signal sequence, and wherein, reference signal sequence is demodulated reference signal (DMRS) sequence.

It should be noted that in CoMPJT, the reception of UE is detected transparent in order to realize the transmission of multiple transmission node, needs to use identical DMRS sequence.As shown in Figure 8.Figure illustrates as a example by two community associated cooperation transmission, whereinThe physical transport block (PhysicalResourceBlock, referred to as PRB) represented is by carrying out the PRB that joint transmission is used, and represents that single community user transmits the PRB used.

Step S704: the reference signal sequence of generation is mapped.

Pass through above-mentioned steps, when carrying out multi-point coordinated joint transmission, in the resource of joint transmission, each community produces DMRS sequence according to the community ID of main Serving cell so that use identical sequence in corresponding resource with main Serving cell in the resource of joint transmission.Avoid in correlation technique and produce by the way of the ID of virtual subdistrict, the switching at runtime of single community and multi-plot joint transmission is brought restriction, improves the compatibility of DMRS sequence and cooperation transmission, and improve the performance of cooperation transmission.

Shown below is based on the embodiment of the present invention, it is provided that reference signal mapping device.Fig. 9 is the first structured flowchart of reference signal mapping device according to embodiments of the present invention, as it is shown in figure 9, this device includes: the first generation module 92 and mapping block 94, is described in detail said structure below:

First generation module 92, is used for using maximum system bandwidth to generate reference signal sequence；

Mapping block 94, it is connected to the first generation module 92, map for choosing the reference sequences of mapping in the reference signal sequence that the first generation module 82 generates, wherein, the reference signal sequence that the reference sequences of mapping is corresponding on identical resource location when being maximum system bandwidth.

Figure 10 is preferred first structured flowchart of reference signal mapping device according to embodiments of the present invention, as shown in Figure 10, mapping block 94 includes: first mapping submodule the 942, second mapping submodule the 944, the 3rd mapping submodule the 946, the 4th mapping submodule 948, is described in detail said structure below:

It should be noted that the reference signal sequence in the present embodiment includes: DMRS sequence and CSI-RS sequence.

Mapping block 94 includes: the first mapping submodule 942, it is connected to the first generation module 92, in the subframe at normal prefix (normalCP), when reference signal sequence is DMRS sequence, the reference sequences using below equation to choose mapping in the reference signal sequence that the first generation module 92 generates maps:

Wherein,Represent reference signal corresponding on pth port kth subcarrier on the l orthogonal frequency division multiplex OFDM symbol, wherein l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, s represents the spread spectrum code value of corresponding DMRS port, r is reference signal sequence, and l' represents the notation index of the OFDM of DMRS in a subframe, and l'=0,1,2,3For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding, n_PRBRepresenting Resource Block index, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, m'=0,1,2.

Mapping block 94 includes: the second mapping submodule 944, it is connected to the first generation module 92, in the normal sub-frames at expanded prefix (extentCP), when reference signal sequence is DMRS sequence, the reference sequences using below equation to choose mapping in the reference signal sequence that the first generation module 92 generates maps:

Wherein,Represent reference signal corresponding on pth port kth subcarrier on the l orthogonal frequency division multiplex OFDM symbol, wherein l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, s represents the spread spectrum code value of corresponding DMRS port, r is reference signal sequence, and l' represents the notation index of the OFDM of DMRS in a subframe, and l'=0,1,2,3For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding, n_PRBRepresenting Resource Block index, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, m'=0,1,2.

Mapping block 94 includes: the 3rd mapping submodule 946, it is connected to the first generation module 92, in the special subframe at expanded prefix (extentCP), reference signal sequence is DMRS sequence, and the reference sequences using below equation to choose mapping in the reference signal sequence that the first generation module 92 generates maps:

Wherein,Represent reference sequences corresponding on pth port kth subcarrier on the l orthogonal frequency division multiplex OFDM symbol, wherein l represents that the OFDM symbol placing DMRS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to DMRS in the OFDM symbol exist DMRS, l and k value is determined by DMRS pattern, and s represents the spread spectrum code value of corresponding DMRS port, and r is reference signal sequence, l' represents the notation index of the OFDM of DMRS in a subframe, and l'=0,1For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding, n_PRBRepresenting Resource Block index, m' is corresponding to the DMRS Resource Unit location index on a DMRSOFDM symbol in a Resource Block, m'=0,1,2.

Mapping block 94 includes: the 4th mapping submodule 948, it is connected to the first generation module 92, for reference signal sequence be CSI-RS sequence time, use below equation to choose the reference sequences of mapping in the reference signal sequence that the first generation module 92 generates and map:Wherein,Represent reference signal corresponding on pth port kth subcarrier on the l OFDM (OFDM) symbol, wherein l represents that the OFDM symbol placing CSI-RS indexes relative to the OFDM symbol in a time slot, the frequency domain position that k maps corresponding to CSI-RS in the OFDM symbol exist CSI-RS, l and k value is determined by CSI-RS pattern, s represents the spread spectrum code value of corresponding CSI-RS port, r is reference signal (CSI-RS) sequence For the resource block number that maximum system bandwidth is corresponding,Represent the resource block number that current system bandwidth is corresponding.

It should be noted that, in real system is applied, can be with the one or more combination application in first mapping submodule the 942, second mapping submodule the 944, the 3rd mapping submodule the 946, the 4th these four submodules of mapping submodule 948 in Choose for user module 94.

Present embodiments provide a kind of reference signal mapping device, Figure 11 is the second structured flowchart of reference signal mapping device according to embodiments of the present invention, as shown in figure 11, this device includes: the second generation module 112 and sequence mapping module 114, is described in detail said structure below:

Second generation module 112, for using the cell ID of main Serving cell to generate reference signal sequence, wherein, reference signal sequence is DMRS sequence；Sequence mapping module 114, is connected to the second generation module 112, for being mapped by the reference signal sequence that the second generation module 112 generates.

In sum, pass through above-described embodiment, use the mapping mode under different bandwidth of the DMRS sequence described in above-described embodiment, so that cooperation cell and UE carry out the mapping of sequence in the case of requiring no knowledge about other cell system bandwidth, sequence mapping mode under different bandwidth is the most consistent with the sequence truncation mode of different user under unified bandwidth simultaneously, additionally community based on main Serving cell, other communities ID produces sequence, can make CoMP transmission that UE is received detection transparent.

Obviously, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculating device, they can concentrate on single calculating device, or it is distributed on the network that multiple calculating device is formed, alternatively, they can realize with calculating the executable program code of device, thus, can be stored in storing in device and be performed by calculating device, and in some cases, can be to be different from the step shown or described by order execution herein, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize.So, the present invention is not restricted to the combination of any specific hardware and software.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.

Claims (2)

1. a reference signal mapping method, it is characterised in that including:

When carrying out multi-point coordinated joint transmission, in the resource of joint transmission, each community uses the cell ID of main Serving cell to generate reference signal sequence, and wherein, described reference signal sequence is demodulated reference signal DMRS sequence；

The described reference signal sequence generated is mapped.

2. a reference signal mapping device, it is characterised in that described device is positioned in each community carrying out multi-point coordinated joint transmission, including:

Second generation module, for when carrying out multi-point coordinated joint transmission, in the resource of joint transmission, uses the cell ID of main Serving cell to generate reference signal sequence, and wherein, described reference signal sequence is demodulated reference signal DMRS sequence；

Sequence mapping module, for mapping the described reference signal sequence generated.