CN106712915B - A method, apparatus, base station and terminal for sending demodulation reference signal - Google Patents

Abstract

Embodiments of the present invention provide a method, apparatus, base station, and terminal for sending a demodulation reference signal, wherein the method includes: using a first mapping for the DMRS sent to the terminal through the demodulation reference signal DMRS port 7 and DMRS port 8 Perform the mapping processing in sequence to obtain the first DMRS; perform the mapping processing on the DMRS sent to the terminal through the DMRS port 11 and the DMRS port 13 using the second mapping order to obtain the second DMRS; wherein, the first mapping order and the second mapping order are opposite Send the first DMRS and/or the second DMRS to the terminal, the embodiment of the present invention can make the power of the orthogonal frequency division multiplexing symbol keep the power of the orthogonal frequency division multiplexing symbol while ensuring backward compatibility in the case of multi-user maximum 8-stream transmission. balance.

Description

A method, apparatus, base station and terminal for sending demodulation reference signal

technical field

The present invention relates to the field of wireless technologies, and in particular, to a method, an apparatus, a base station and a terminal for sending a demodulation reference signal.

Background technique

Existing communication systems, such as Long Term Evolution (LTE, Long Term Evolution), Worldwide Interoperability for Microwave Access (WiMax, Worldwide Interoperability for Microwave Access), and 802.11n, all use traditional 2D Multiple Input Multiple Output (MIMO, Multiple -IZPut Multiple-Output,) technology, its basic principle is to improve transmission quality and system capacity through two-dimensional spatial degrees of freedom on the horizontal plane. With the development of antenna design architecture, in order to improve the transmission efficiency of mobile communication systems and improve user experience, it is necessary to fully exploit the degree of freedom in vertical space, extend the traditional 2D MIMO technology to 3D MIMO technology, and make full use of the degree of freedom in three-dimensional space to improve the system. performance.

The antenna architecture of 2D MIMO uses multiple elements in the vertical dimension to obtain higher antenna gain. Each antenna array element in the vertical dimension adopts a fixed weight to ensure that the required beam pattern is obtained in the vertical dimension. Therefore, 2D MIMO technology has no way to perform beamforming in the vertical dimension.

In order to fully utilize the MIMO technology in the vertical dimension, 3D MIMO can form different beams by controlling the weighting factors of different antenna elements in the vertical dimension. The vertical dimension beams can be effectively distinguished, thereby providing multi-user multiplexing in the vertical dimension and increasing the capacity. The traditional LTE system supports the design of up to 8 antennas. 3D MIMO expands the number of channels of the antenna, and supports three-dimensional antenna forms such as 16, 32, 64, and 128 channels.

The design of the demodulation reference signal (DMRS) of Multi-User Multiple-Input Multiple-Output (MU-MIMO, Multi-User Multiple-Input Multiple-Output) in the existing standard is as follows:

The existing standard 3rd Generation Partnership Project (3GPP) version 12 supports user multi-streams as follows: a total of 4 streams (layers), that is, 2 orthogonal DMRS ports (ports) 7 and 8 use a positive length of 2. The intersection mask (OCC, orthogonal covercode) and two scrambling codes (Scrambling ID 0, 1) occupy 12 resource elements (RE).

Among them, the principle of OCC is: assuming that the channels on multiple columns (symbols) remain unchanged, the DMRS sequence is simultaneously transmitted on multiple symbols to obtain diversity gain.

For example, in the design of OCC=2, it is assumed that the channels of symbols #5 and #6 of Orthogonal Frequency Division Multiplexing (OFDM) remain unchanged, and DMRS port7 is used [+1 +1] in symbols #5, # 6, and port8 uses [+1 -1] to transmit on symbols #5 and #6. Then the OCC decoding is: the channel estimation of DMRS port7 is: s ₇ ^H (y ₅ +y ₆ )/2, where s ₇ represents the DMRS port7 signal, and y ₅ and y ₆ represent the signals received by symbols #5 and #6, respectively. Signal. The channel estimation of DMRS port8 is: s ₈ ^H (y ₅ -y ₆ )/2, where s ₈ represents the DMRS port8 signal.

For example: In the design of OCC=4, assuming that the channels of OFDM symbols #5, #6, #12 and #13 remain unchanged, use [+1 +1 +1 +1] for DMRPort7 in symbols #5, #6, # 12 and #13, port8 uses [+1 -1 +1 -1] to transmit on symbol#5, #6, #12 and #13, port11 uses [+1 +1 -1 -1] to transmit on symbol# 5. Transmit on #6, #12 and #13, and port13 transmits on symbols #5, #6, #12 and #13 using [+1 -1 -1 +1]. Then the OCC decoding is: The channel estimation of DMRSport7 is: s ₇ ^H (y ₅ +y ₆ +y ₁₂ +y ₁₃ )/2, where s ₇ represents the DMRS port7 signal, y ₅ , y ₆ , y ₁₂ and y ₁₃ Represent the signals received by symbols #5, #6, #12 and #13, respectively.

The resource occupancy situation of DMRS during multi-user pairing in the existing standard is shown in Figure 1, wherein the OFDM symbols #5, #6, #12 and #13 in Figure 1 are provided with signs such as "/" The small squares represent the occupied resources, and the resource mapping of the DMRS is shown in Table 1.

Table 1

的序列如表2所示，其中

标识端口p的序列，p代表端口，p＝7、8、9、10、11、12、13、14，

表示

的第一个码字，

表示

的第二个码字，

表示

的第三个码字，

表示

的第四个码字。The DMRS design of a single user with a maximum of 8 streams in the existing standard adopts OCC=4, occupies 24 REs, and provides completely orthogonal 8-stream transmission. The specific DMRS resource occupancy situation is shown in Figure 2. The small squares with signs such as "/" in the multiplexing symbols #5, #6, #12 and #13 indicate the resources occupied by them. and under normal cycle length

The sequence is shown in Table 2, where

A sequence that identifies a port p, p stands for port, p=7, 8, 9, 10, 11, 12, 13, 14,

express

The first codeword of ,

express

The second codeword of ,

express

The third codeword of ,

express

the fourth codeword of .

Table 2

Combined with the progress of standardization, one of the DMRS configuration trends currently discussed in standardization is:

The DMRS of the terminal after LTE release 12 (ie, the new terminal) uses a total of 12RE, and uses the OCC of length 4 to provide 4 orthogonal DMRS ports, and the scrambling code nSCID=0, 1 provides another 4 streams of quasi-orthogonal transmission, Supports multi-user transmission of a total of 8 streams, and its specific DMRS resource occupancy is shown in Figure 3, where "/" is set in the OFDM symbols #5, #6, #12 and #13 in Figure 3 The small squares marked with etc. represent the resources occupied by them.

Following the OCC design of the same position in the single-user 8-stream in the existing standard, the DMRS design supporting multi-user 8-stream transmission is shown in Table 3.

table 3

Among them, OCC adopts the walsh code of length 4 as follows:

Considering that DMRS also undergoes precoding, assuming that the 4 columns of the above walsh code are represented by a, b, c, and d, respectively, and the 4 lines represent the codewords of port7, 8, 11, and 13, respectively, then the DMRS on the nth antenna represents for:

where _wn,k (where k=1, 2, 3, 4) is the precoding weight corresponding to the k stream on the nth antenna, if _wn,1 =w _n,2 =w _n,3 =w _n,4 , then the power of OFDM symbols #5, #6, #12, #13 in transmitting DMRS REs is expressed as follows:

When the multi-user quadrature 2 streams use ports 7 and 8, the amplitudes on the 4 symbols are 2, 0, 2, and 0 respectively; when the single-user quadrature 8 streams use ports 7 to 14, the amplitudes on the 4 symbols are respectively is 4, 0, 4, 0. It can be seen that the power imbalance between OFDM symbols affects the power efficiency of the transmitting end.

In the existing protocol, in order to deal with the problem of power imbalance, corresponding solutions are proposed:

That is, the order of the four codewords of the OCC is adjusted: the order of the even-numbered lines is a, b, c, and d, and the order of the odd-numbered lines is d, c, b, and a. In this way, it can be ensured that on the granularity of two physical resource blocks (PRBs), the power of the four OFDM symbols transmitting DMRS is balanced.

Considering that 3D MIMO introduces more antenna elements, and can provide vertical and horizontal beamforming, more paired users can be distinguished. However, the MU-MIMO defined in the existing standard only supports a maximum of 4 streams and a DMRS design with a maximum of 2 streams per user, which cannot meet the requirement for more user pairing under 3D MIMO.

When the multi-user transmits a maximum of 8 streams, in the DMRS configuration implemented by using 12RE, OCC=4 and 2 scrambling codes, if the OCC bitmap method defined by the existing standard is directly used, there will be power imbalance between OFDM symbols. question. As shown in Figures 6 to 7, if the previously used OCC bitmap method is used, the power of OFDM symbols 5 and 13 is greater than the power of OFDM symbols 6 and 12 when multi-user 4 orthogonal data streams are used. Among them, the power of DMRS The 4 RE amplitudes are 4, 0, 0, 0 and 0, 0, 0, 4, respectively.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a method, an apparatus, a base station and a terminal for transmitting a demodulation reference signal, which can ensure the backward compatibility while ensuring the backward compatibility in the case of multi-user 8-stream transmission. power balance.

In order to achieve the above object, an embodiment of the present invention provides a method for sending a demodulation reference signal, which is applied to a base station, and the method includes:

Perform mapping processing on the DMRS sent to the terminal through the demodulation reference signal DMRS port 7 and DMRS port 8 using the first mapping sequence to obtain the first DMRS;

Perform mapping processing on the DMRS sent to the terminal through the DMRS port 11 and the DMRS port 13 using the second mapping order to obtain the second DMRS; wherein, the first mapping order is opposite to the second mapping order;

The first DMRS and/or the second DMRS are sent to the terminal.

Wherein, before the step of using the second mapping sequence to perform mapping processing on the DMRS sent to the terminal through the DMRS port 11 and the DMRS port 13 to obtain the second DMRS, the method further includes:

A first orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 11 is acquired, and the second mapping order is the codeword mapping order of the first orthogonal mask sequence.

Wherein, the step of obtaining the first orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 11 includes:

by formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_PRB表示物理资源块PRB在整个带 宽中的编号。 Obtain the first orthogonal mask sequence, where w ₁₁ (i) represents the ith codeword in the first orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block PRB in the entire bandwidth.

Wherein, before the step of using the second mapping sequence to perform mapping processing on the DMRS sent to the terminal through the DMRS port 11 and the DMRS port 13 to obtain the second DMRS, the method further includes:

A second orthogonal mask sequence for performing mapping processing on the DMRS sent to the terminal through the DMRS port 13 is acquired, and the second mapping order is the codeword mapping order of the second orthogonal mask sequence.

Wherein, the step of obtaining the second orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 13 includes:

by formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_PRB表示物理资源块PRB在整个带 宽中的编号。 Obtain a second orthogonal mask sequence, where w ₁₃ (i) represents the ith codeword in the second orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block PRB in the entire bandwidth.

An embodiment of the present invention also provides an apparatus for sending a demodulation reference signal, which is applied to a base station, and the apparatus includes:

a first mapping module, configured to perform mapping processing on the DMRS sent to the terminal through the demodulation reference signal DMRS port 7 and DMRS port 8 using the first mapping sequence to obtain the first DMRS;

The second mapping module is configured to perform mapping processing on the DMRS sent to the terminal through the DMRS port 11 and the DMRS port 13 using the second mapping order to obtain the second DMRS; wherein, the first mapping order is opposite to the second mapping order;

A sending module, configured to send the first DMRS and/or the second DMRS to the terminal.

Wherein, the device also includes:

The first obtaining module is configured to obtain a first orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 11, and the second mapping sequence is the codeword mapping sequence of the first orthogonal mask sequence.

Wherein, the first acquisition module includes:

The first acquisition unit, used to pass the formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_PRB表示物理资源块PRB在整个带 宽中的编号。 Obtain the first orthogonal mask sequence, where w ₁₁ (i) represents the ith codeword in the first orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block PRB in the entire bandwidth.

Wherein, the device also includes:

The second obtaining module is configured to obtain a second orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 13, and the second mapping sequence is the codeword mapping sequence of the second orthogonal mask sequence.

Wherein, the second acquisition module includes:

The second acquisition unit is used to pass the formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_PRB表示物理资源块PRB在整个带 宽中的编号。 Obtain a second orthogonal mask sequence, where w ₁₃ (i) represents the ith codeword in the second orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block PRB in the entire bandwidth.

An embodiment of the present invention also provides a base station, including the above-mentioned apparatus for sending a demodulation reference signal.

An embodiment of the present invention also provides a method for sending a demodulation reference signal, which is applied to a terminal, and the method includes:

Receiving the first DMRS that the base station has undergone the first mapping sequence mapping process and sent through the demodulation reference signal DMRS port 7 and DMRS port 8, and/or the base station has undergone the second mapping sequence mapping process and sent through DMRS port 11 and DMRS port 13. the second DMRS; wherein, the first mapping order and the second mapping order are opposite;

Channel estimation is performed according to the first DMRS and/or the second DMRS.

An embodiment of the present invention also provides an apparatus for sending a demodulation reference signal, which is applied to a terminal, and the apparatus includes:

The receiving module is configured to receive the first DMRS sent by the base station through the first mapping order mapping process and through the demodulation reference signal DMRS port 7 and DMRS port 8, and/or the base station has undergone the second mapping order mapping process and passed the DMRS port 11 and DMRS port 8. The second DMRS sent by the DMRS port 13; wherein, the first mapping order and the second mapping order are opposite;

an estimation module, configured to perform channel estimation according to the first DMRS and/or the second DMRS.

An embodiment of the present invention also provides a terminal, including the above-mentioned apparatus for sending a demodulation reference signal.

The above-mentioned scheme of the present invention at least includes the following beneficial effects:

In the embodiment of the present invention, the first DMRS is obtained by performing mapping processing on the DMRS sent to the terminal through the DMRS port 7 and the DMRS port 8 using the first mapping sequence, and the first DMRS is obtained through the DMRS port 11 and the DMRS port 13. The DMRS is mapped using the second mapping order opposite to the first mapping order to obtain the second DMRS, and the first DMRS and/or the second DMRS are sent to the terminal, which solves the problem in the case of multi-user maximum 8-stream transmission , the problem of unbalanced power of OFDM symbols achieves the effect of keeping the power of OFDM symbols balanced while ensuring backward compatibility in the case of multi-user transmission with a maximum of 8 streams.

Description of drawings

1 is a schematic diagram of resource occupation of DMRS when an orthogonal mask with a length of 4 is used to perform multi-user pairing in an existing standard;

2 is a schematic diagram of resource occupation of DMRS when an orthogonal mask with a length of 4 is used for single-user 8-stream transmission in an existing standard;

3 is a schematic diagram of resource occupation of DMRS when an orthogonal mask with a length of 4 is used for multi-user 8-stream transmission in an existing standard;

4 is a schematic diagram of codeword allocation when an orthogonal mask with a length of 4 is used for single-user 8-stream transmission in an existing standard;

5 is a schematic diagram of the amplitude when an orthogonal mask with a length of 4 is used for single-user 8-stream transmission in an existing standard;

6 is a schematic diagram of codeword allocation when using an orthogonal mask with a length of 4 to perform multi-user 4-stream transmission in an existing standard;

Fig. 7 is the amplitude schematic diagram when adopting the orthogonal mask of length 4 to carry out multi-user 4-stream transmission in the existing standard;

8 is a flowchart of a method for sending a demodulation reference signal in the first embodiment of the present invention;

9 is a schematic diagram of codeword allocation when the DMRS sent by DMRS port 7 and DMRS port 8 adopts an orthogonal mask with a length of 4 to perform multi-user 4-stream transmission in the first embodiment of the present invention;

10 is a schematic diagram of codeword allocation when the DMRS sent through the DMRS port 11 and the DMRS port 13 adopts an orthogonal mask with a length of 4 to perform multi-user 4-stream transmission in the first embodiment of the present invention;

11 is a schematic diagram of the amplitude when an orthogonal mask with a length of 4 is used for multi-user 4-stream transmission in the first embodiment of the present invention;

12 is a schematic structural diagram of an apparatus for sending a demodulation reference signal according to a second embodiment of the present invention;

13 is a flowchart of a method for sending a demodulation reference signal in a fourth embodiment of the present invention;

FIG. 14 is a schematic structural diagram of an apparatus for sending a demodulation reference signal in a fifth embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

first embodiment

As shown in FIG. 8 , the first embodiment of the present invention provides a method for sending a demodulation reference signal, which is applied to a base station, and the method includes:

Step S801 , perform mapping processing on the DMRS sent to the terminal through the demodulation reference signal port 7 and the DMRS port 8 using the first mapping sequence to obtain the first DMRS.

In the first embodiment of the present invention, the orthogonal mask sequence for mapping the DMRS sent to the terminal through the demodulation reference signal (DMRS) port 7 and DMRS port 8 is the same as the existing standard orthogonal mask sequence .

Step S802, performing mapping processing on the DMRS sent to the terminal through the DMRS port 11 and the DMRS port 13 using the second mapping sequence to obtain the second DMRS.

Wherein, the above-mentioned first mapping order and the second mapping order are opposite.

In the first embodiment of the present invention, the above-mentioned steps S801 and S802 are not in order.

Step S803, sending the first DMRS and/or the second DMRS to the terminal.

In the first embodiment of the present invention, in order to explain the above-mentioned step S803 in more detail, the terminal is explained here. That is, in the first embodiment of the present invention, a terminal before LTE Release 12 (including Release 12) is called a legacy terminal (UE), and a terminal after LTE Release 12 is called a new UE.

Correspondingly, in a multi-user maximum 8-stream transmission scenario, when a new UE is paired with a legacy UE, the base station sends DMRS to the legacy UE through DMRS port 7 and DMRS port 8, and sends DMRS to the new UE through DMRS port 11 and DMRS port 13. . However, the orthogonal mask sequence for mapping the DMRS sent to the legacy UE through DMRS port 7 and DMRS port 8 is the same as the existing standard orthogonal mask sequence, so that the OFDM can be ensured while ensuring backward compatibility. The power of the symbols is balanced.

In the multi-user maximum 8-stream transmission scenario, when there is only pairing between new UEs, there is no need to distinguish the DMRS ports for sending DMRS, because the new UE can receive and identify DMRS port 7, DMRS port 8, DMRS port 11 and DMRS for DMRS port 13. In addition, in a multi-user transmission scenario with a maximum of 8 streams, if there is only a pairing between traditional UEs, it can be performed according to the existing standard, so it is not repeated here.

In the first embodiment of the present invention, the first DMRS is obtained by performing mapping processing on the DMRS sent to the terminal through the DMRS port 7 and the DMRS port 8 using the first mapping sequence, and the first DMRS sent through the DMRS port 11 and the DMRS port 13 The DMRS of the terminal is mapped using a second mapping order opposite to the first mapping order to obtain the second DMRS, and the first DMRS and/or the second DMRS are sent to the terminal, which solves the problem of maximum 8-stream transmission in multi-users. Under the circumstance, the problem of power imbalance of OFDM symbols achieves the problem of keeping the power of OFDM symbols balanced while ensuring backward compatibility in the case of multi-user transmission with a maximum of 8 streams. Effect.

In the first embodiment of the present invention, before performing the foregoing step S802, the foregoing method further includes: acquiring a first orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 11, and the foregoing second mapping The order is the codeword mapping order of the first orthogonal mask sequence. Specifically, through the formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_PRB表示物理资源块(PRB)在整个 带宽中的编号。 Obtain the first orthogonal mask sequence, where w ₁₁ (i) represents the ith codeword in the first orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block (PRB) in the entire bandwidth.

)，那么通过上述w₁₁(i) 公式的计算，得到的第一正交掩码序列的码字映射顺序为d、c、b、a(该顺序即为上述第二映 射顺序)。可以理解的是，当现有标准中的正交掩码序列1的码字的映射顺序为d、c、b、a时， 通过上述w₁₁(i)公式的计算，得到的第一正交掩码序列的码字的映射顺序为a、b、c、d。即，相 当于将现有标准中a、b、c、d和d、c、b、a的正交掩码序列的码字映射顺序对应的行互换。 In order to elaborate the function of the expression of the above w ₁₁ (i), it is assumed that the codeword mapping order of the orthogonal mask sequence 1 for mapping the DMRS sent to the terminal through the DMRS port11 in the existing standard is a, b , c, d (this order is the above-mentioned first mapping order, a, b, c, d represent the codewords of each column of the orthogonal mask sequence 1, respectively,

), then through the calculation of the above formula w ₁₁ (i), the codeword mapping order of the obtained first orthogonal mask sequence is d, c, b, a (this order is the above-mentioned second mapping order). It can be understood that, when the mapping order of the codewords of the orthogonal mask sequence ₁ in the existing standard is d, c, b, and a, the first orthogonal The mapping order of the codewords of the mask sequence is a, b, c, d. That is, it is equivalent to exchanging rows corresponding to the codeword mapping order of the orthogonal mask sequences of a, b, c, d and d, c, b, a in the existing standard.

Similarly, before performing the foregoing step S802, the foregoing method further includes: acquiring a second orthogonal mask sequence for performing mapping processing on the DMRS sent to the terminal through the DMRS port 13, and the foregoing second mapping sequence is the second orthogonal mask sequence. The codeword mapping order of the code sequence. Specifically, through the formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_RRB表示物理资源块(PRB)在整个 带宽中的编号。 Obtain a second orthogonal mask sequence, where w ₁₃ (i) represents the ith codeword in the second orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _RRB represents the number of the physical resource block (PRB) in the entire bandwidth.

)，那么通过上述w₁₃(i) 公式的计算，得到的第二正交掩码序列的码字映射顺序为d、c、b、a(该顺序即为上述第二映 射顺序)。可以理解的是，当现有标准中的正交掩码序列2的码字的映射顺序为d、c、b、a时， 通过上述w₁₃(i)公式的计算，得到的第二正交掩码序列的码字的映射顺序为a、b、c、d。即，相 当于将现有标准中a、b、c、d和d、c、b、a的正交掩码序列的码字映射顺序对应的行互换。 In order to elaborate the function of the expression of w ₁₃ (i), it is assumed that the codeword mapping order of the orthogonal mask sequence 2 for mapping the DMRS sent to the terminal through the DMRS port 13 in the existing standard is a, b , c, d (this order is the above-mentioned first mapping order, a, b, c, d represent the codewords of each column of the orthogonal mask sequence 1, respectively,

), then through the calculation of the above formula w ₁₃ (i), the codeword mapping order of the obtained second orthogonal mask sequence is d, c, b, a (this order is the above-mentioned second mapping order). It can be understood that, when the mapping order of the codewords of the orthogonal mask sequence 2 in the existing standard is d, c, b, and a, the second orthogonal obtained by the calculation of the above formula w ₁₃ (i) The mapping order of the codewords of the mask sequence is a, b, c, d. That is, it is equivalent to exchanging rows corresponding to the codeword mapping order of the orthogonal mask sequences of a, b, c, d and d, c, b, a in the existing standard.

Similar to DMRS port11 and DMRS port13, the orthogonal mask sequence 3 for mapping the DMRS sent to the terminal through DMRS port 7 can be calculated by the formula

m′表示每个物理资源 块中DMRS占用的子载波的行号，m′＝0表示每个物理资源块中DMRS占用的第1行子载波，m′ ＝1表示每个物理资源块中DMRS占用的第6行子载波，m′＝2表示每个物理资源块中DMRS占 用的第11行子载波，n_PRB表示物理资源块(PRB)在整个带宽中的编号。 Calculated, where w ₇ (i) represents the i-th codeword in the orthogonal mask sequence 3, i represents the sequence number of the codeword, i= 0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block (PRB) in the entire bandwidth.

Similarly, the orthogonal mask sequence 4 for mapping the DMRS sent to the terminal through the DMRS port 8 can be obtained by formula

m′表示每个物理资源 块中DMRS占用的子载波的行号，m′＝0表示每个物理资源块中DMRS占用的第1行子载波，m′ ＝1表示每个物理资源块中DMRS占用的第6行子载波，m′＝2表示每个物理资源块中DMRS占 用的第11行子载波，n_PRB表示物理资源块(PRB)在整个带宽中的编号。 Calculated, where w ₈ (i) represents the i-th codeword in the orthogonal mask sequence 4, i represents the sequence number of the codeword, i= 0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block (PRB) in the entire bandwidth.

It should be noted that the orthogonal mask sequence 3 for mapping the DMRS sent to the terminal through the DMRS port 7 is the same as the orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 7 in the existing standard. , and the orthogonal mask sequence 4 for mapping the DMRS sent to the terminal through the DMRS port 8 is the same as the orthogonal mask sequence 4 for mapping the DMRS sent to the terminal through the DMRS port 8 in the existing standard. Therefore, the above-mentioned w ₇ (i) and w ₈ (i) will not be explained too much here.

It can be known from the above formulas of w ₇ (i), w ₈ (i), w ₁₁ (i) and w ₁₃ (i) that in the first embodiment of the present invention, The DMRS of the terminal uses the first mapping order (the first mapping order is the same as the mapping order in the existing standard) for mapping processing, and the DMRS sent to the terminal through the DMRS port 11 and DMRS port 13 uses the opposite to the first mapping order. The mapping process is performed in the second mapping order, thereby achieving the effect of keeping the power of the OFDM symbols balanced while ensuring backward compatibility in the case of multi-user 8-stream transmission.

In the first embodiment of the present invention, the above method is described with a specific example. As shown in FIG. 9 , the DMRS sent to the terminal through DMRS port 7 and DMRS port 8 are in the order of codewords in the first row of the PRB with n _PRB = 1. The order of code words is a, b, c, d, and the order of code words in row 11 is d, c, b, a; and the order of code words in the first row of PRBs with n _PRB = 2 is a, b, c, d, the order of code words in row 6 is d, c, b, a, and the order of code words in row 11 is a, b, c, d. Similarly, as shown in FIG. 10 , the DMRS sent to the terminal through DMRS port 11 and DMRS port 13 are in the first row of the PRB with n _PRB =1 in the order of a, b, c, and d. The order of the code words in the row is all d, c, b, a, and the order of the code words in the 11th row is all a, b, c, d; while the code words in the first row of the PRB with n _PRB = 2 are in the order of The order is a, b, c, d, the code word order in the sixth row is d, c, b, a, and the code word order in the eleventh row is a, b, c, d. After such transmission, the amplitudes of OFDM symbols #5, #6, #12, #13 are as shown in FIG. 11 .

Taking the codeword in the first row of the PRB with n _PRB =1 as an example, it can be seen from FIGS. 9 to 10 that in the first row of the PRB with n _PRB =1, the DMRS transmitted to the terminal through the DMRS port 7 The codeword of the orthogonal mask sequence 3 for mapping processing is: d=1, c=1, b=1, a=1, and the orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 8 The codeword of 4 is: d=-1, c=1, b=-1, a=1, and the codeword of the first orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 11 is: a=1, b=1, c=-1, d=-1, the codeword of the second orthogonal mask sequence for mapping the DMRS sent to the terminal through DMRS port 13 is: a=1, b= -1, c=-1, d=1. Thus, as shown in FIG. 11 , the amplitudes of OFDM symbols #5, #6, #12, and #13 in the first row of the PRB with n _PRB =1 are 2, 2, -2, and 2, respectively.

Similarly, in the sixth row of the PRB with n _PRB =1, the codeword of the orthogonal mask sequence 3 for mapping the DMRS sent to the terminal through the DMRS port 7 is: a=1, b=1, c =1, d=1, the codeword of the orthogonal mask sequence 4 for mapping the DMRS sent to the terminal through the DMRS port 8 is: a=1, b=-1, c=1, d=-1, The codewords of the first orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 11 are: d=-1, c=-1, b=1, a=1, and the codewords of the first orthogonal mask sequence for the mapping process are: d=-1, c=-1, b=1, a=1, The codewords of the second orthogonal mask sequence for mapping the DMRS of the terminal are: d=1, c=-1, b=-1, a=1. Thus, as shown in FIG. 11 , the amplitudes of OFDM symbols #5, #6, #12, and #13 in the sixth row of the PRB with n _PRB =1 are 2, -2, 2, and 2, respectively.

Similarly, as shown in FIG. 11, the amplitudes of OFDM symbols #5, #6, #12, #13 in the 11th row of PRBs with n _PRB = 1 are 2, 2, -2, and 2, respectively, and in n _PRB The amplitudes of OFDM symbols #5, #6, #12, #13 in the first row of PRBs with n PRB = 2 are 2, -2, 2, and 2, respectively, and in the sixth row of PRBs with n _PRB =2 OFDM symbols # 5. The amplitudes of #6, #12, and #13 are 2, 2, -2, and 2, respectively, and the amplitudes of OFDM symbols #5, #6, #12, and #13 in the 11th row of the PRB with n _PRB = 2 2, -2, 2, 2, respectively. From this, it can be seen that the power of each OFDM symbol is balanced.

Second Embodiment

As shown in FIG. 12 , a second embodiment of the present invention provides an apparatus for sending a demodulation reference signal, which is applied to a base station, and the apparatus includes:

The first mapping module 1201 is configured to perform mapping processing on the DMRS sent to the terminal through the demodulation reference signal DMRS port 7 and DMRS port 8 using the first mapping sequence to obtain the first DMRS;

The second mapping module 1202 is configured to perform mapping processing on the DMRS sent to the terminal through the DMRS port 11 and the DMRS port 13 using the second mapping order to obtain the second DMRS; wherein the first mapping order and the second mapping order are opposite;

The sending module 1203 is configured to send the first DMRS and/or the second DMRS to the terminal.

Wherein, the device also includes:

The first obtaining module is configured to obtain a first orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 11, and the second mapping sequence is the codeword mapping sequence of the first orthogonal mask sequence.

Wherein, the first acquisition module includes:

The first acquisition unit, used to pass the formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_PRB表示物理资源块PRB在整个带 宽中的编号。 Obtain the first orthogonal mask sequence, where w ₁₁ (i) represents the ith codeword in the first orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block PRB in the entire bandwidth.

Wherein, the device also includes:

The second obtaining module is configured to obtain a second orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port 13, and the second mapping sequence is the codeword mapping sequence of the second orthogonal mask sequence.

Wherein, the second acquisition module includes:

The second acquisition unit is used to pass the formula

m′表示每个物理资源块中DMRS占用的子载波的行号，m′＝0表示每个物理 资源块中DMRS占用的第1行子载波，m′＝1表示每个物理资源块中DMRS占用的第6行子载波， m′＝2表示每个物理资源块中DMRS占用的第11行子载波，n_PRB表示物理资源块PRB在整个带 宽中的编号。 Obtain a second orthogonal mask sequence, where w ₁₃ (i) represents the ith codeword in the second orthogonal mask sequence, i represents the sequence number of the codeword, i=0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, m'=0 represents the first row subcarrier occupied by the DMRS in each physical resource block, m'=1 represents the DMRS in each physical resource block The 6th row of occupied subcarriers, m'=2 represents the 11th row of subcarriers occupied by the DMRS in each physical resource block, and n _PRB represents the number of the physical resource block PRB in the entire bandwidth.

In the second embodiment of the present invention, the base station obtains the first DMRS by performing mapping processing on the DMRS sent to the terminal through DMRS port 7 and DMRS port 8 using the first mapping sequence, and the base station obtains the first DMRS through DMRS port 11 and DMRS port 13. The DMRS sent to the terminal uses the second mapping order opposite to the first mapping order to perform mapping processing to obtain the second DMRS, and sends the first DMRS and/or the second DMRS to the terminal, which solves the problem of maximum 8-stream transmission in multiple users. In the case of OFDM, the power of OFDM symbols is unbalanced, and the power of OFDM symbols is kept balanced while ensuring backward compatibility in the case of multi-user transmission of up to 8 streams. Effect.

It should be noted that the apparatus for sending a demodulation reference signal provided by the second embodiment of the present invention is an apparatus applying the above-mentioned method for sending a demodulation reference signal applied to a base station, that is, the above-mentioned method for sending a demodulation reference signal applied to a base station All of the embodiments are applicable to the device, and can achieve the same or similar beneficial effects.

Third Embodiment

A third embodiment of the present invention provides a base station, including the above-mentioned apparatus for sending a demodulation reference signal.

It should be noted that the base station provided by the third embodiment of the present invention is a base station that includes the above-mentioned apparatus for transmitting a demodulation reference signal applied to the base station, that is, all the above-mentioned apparatus for transmitting a demodulation reference signal applied to the base station are applicable. In the base station, the same or similar beneficial effects can be achieved.

Fourth Embodiment

As shown in FIG. 13 , a fourth embodiment of the present invention provides a method for sending a demodulation reference signal, which is applied to a terminal, where the method includes:

Step S1301, receiving the first DMRS sent by the base station through the first mapping sequence mapping process and through the demodulation reference signal DMRS port 7 and DMRS port 8, and/or the base station through the second mapping sequence mapping process and through the DMRS port 11 and DMRS port 11 and DMRS port 13. Second DMRS sent.

Wherein, in the fourth embodiment of the present invention, the above-mentioned first mapping order and the second mapping order are opposite.

In the fourth embodiment of the present invention, in order to describe the above-mentioned step S1301 in more detail, the terminal is explained here. That is, in the fourth embodiment of the present invention, a terminal before LTE Release 12 (including Release 12) is called a legacy UE, and a terminal after LTE Release 12 is called a new UE. Then in the multi-user maximum 8-stream transmission scenario, when the new UE is paired with the traditional UE, the new UE receives the DMRS sent by the base station through DMRS port 11 and DMRS port 13, and the traditional UE receives the DMRS sent by the base station through DMRS port 7 and DMRS port 13. DMRS sent by port 8.

In the multi-user maximum 8-stream transmission scenario, when there is only pairing between new UEs, there is no need to distinguish DMRS ports, because new UEs can receive and identify DMRS port 7, DMRS port 8, DMRS port 11 and DMRS port 13 DMRS. In addition, in the multi-user maximum 8-stream transmission scenario, when there is only pairing between traditional UEs, it can be performed according to the existing standard, so it is not repeated here.

Step S1302: Perform channel estimation according to the first DMRS and/or the second DMRS.

In the fourth embodiment of the present invention, step S1302 means that after receiving the DMRS (ie, the first DMRS and/or the second DMRS), the terminal (new UE or legacy UE) will perform the operation according to the received DMRS. channel estimation.

In the fourth embodiment of the present invention, in a multi-user maximum 8-stream transmission scenario, when a new UE is paired with a legacy UE, the new UE receives the DMRS sent by the base station through DMRS port 11 and DMRS port 13, and the legacy UE receives the DMRS sent by the base station through The DMRS sent by DMRS port 7 and DMRS port 8 achieves the effect of keeping the power of OFDM symbols balanced while ensuring backward compatibility in the case of multi-user transmission with a maximum of 8 streams.

Fifth Embodiment

As shown in FIG. 14 , a fifth embodiment of the present invention provides an apparatus for sending a demodulation reference signal, which is applied to a terminal, and the apparatus includes:

A receiving module 1401, configured to receive the first DMRS sent by the base station through the first mapping sequence mapping process and through the demodulation reference signal DMRS port 7 and DMRS port 8, and/or the base station through the second mapping sequence mapping process and through the DMRS port 11 and the second DMRS sent by the DMRS port 13; wherein, the first mapping order and the second mapping order are opposite;

The estimation module 1402 is configured to perform channel estimation according to the first DMRS and/or the second DMRS.

In the fifth embodiment of the present invention, in a multi-user maximum 8-stream transmission scenario, when a new UE is paired with a legacy UE, the new UE receives the DMRS sent by the base station through DMRS port 11 and DMRS port 13, and the legacy UE receives the DMRS sent by the base station through The DMRS sent by DMRS port 7 and DMRS port 8 achieves the effect of keeping the power of OFDM symbols balanced while ensuring backward compatibility in the case of multi-user transmission with a maximum of 8 streams.

It should be noted that the apparatus for sending a demodulation reference signal provided by the fifth embodiment of the present invention is an apparatus applying the above-mentioned method for sending a demodulation reference signal applied to a terminal, that is, the above-mentioned method for sending a demodulation reference signal applied to a terminal All of the embodiments are applicable to the device, and can achieve the same or similar beneficial effects.

Sixth Embodiment

A sixth embodiment of the present invention provides a terminal, including the above-mentioned apparatus for sending a demodulation reference signal.

It should be noted that the terminal provided by the sixth embodiment of the present invention includes the terminal of the above-mentioned apparatus for sending a demodulation reference signal applied to a terminal, that is, all the above-mentioned embodiments of the apparatus for sending a demodulation reference signal applied to a terminal are applicable to The terminal can achieve the same or similar beneficial effects.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (14)

1. A method for transmitting demodulation reference signals, applied to a base station, the method comprising:

carrying out mapping processing on DMRSs sent to a terminal through a demodulation reference signal DMRS port7 and a DMRS port8 by using a first mapping sequence to obtain a first DMRS;

performing mapping processing on the DMRS sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping sequence to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite;

and when the new UE and the traditional UE are paired, correspondingly sending the first DMRS and the second DMRS to the traditional terminal UE and the new terminal UE.

2. The method of claim 1, wherein prior to the step of mapping DMRS transmitted to a terminal through DMRS port11 and DMRS port13 using a second mapping order to obtain a second DMRS, the method further comprises:

and acquiring a first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11, wherein the second mapping sequence is a code word mapping sequence of the first orthogonal mask sequence.

3. The method of claim 2, wherein the step of obtaining the first orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port11 comprises:

by the formula

Obtaining the first orthogonal mask sequence, wherein the w₁₁(i) Denotes an ith codeword in the first orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,

m' represents the row number of the subcarrier occupied by the DMRS in each physical resource block, and m ═ 0 represents the 1 st row subcarrier occupied by the DMRS in each physical resource blockWave, m ═ 1 denotes the 6 th row of subcarriers occupied by the DMRS in each physical resource block, m ═ 2 denotes the 11 th row of subcarriers occupied by the DMRS in each physical resource block, n_PRBIndicating the number of physical resource blocks PRB in the whole bandwidth.

4. The method of claim 1, wherein prior to the step of mapping DMRS transmitted to a terminal through DMRS port11 and DMRS port13 using a second mapping order to obtain a second DMRS, the method further comprises:

and acquiring a second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13, wherein the second mapping sequence is a code word mapping sequence of the second orthogonal mask sequence.

5. The method of claim 4, wherein the step of obtaining the second orthogonal mask sequence for mapping the DMRS transmitted to the terminal through the DMRS port13 comprises:

by the formula

Obtaining the second orthogonal mask sequence, wherein the w₁₃(i) Denotes an ith codeword in the second orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,

m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and n_PRBIndicating that a physical resource block is PRB-roundedNumber in bandwidth.

6. An apparatus for transmitting a demodulation reference signal, applied to a base station, the apparatus comprising:

the first mapping module is used for mapping the DMRS which is sent to the terminal through the demodulation reference signal DMRS port7 and the DMRS port8 by using a first mapping sequence to obtain a first DMRS;

the second mapping module is used for mapping the DMRS which is sent to the terminal through the DMRS port11 and the DMRS port13 by using a second mapping sequence to obtain a second DMRS; wherein the first mapping order and the second mapping order are opposite;

and the sending module is used for correspondingly sending the first DMRS and the second DMRS to the terminal UE and the new terminal UE when the new UE and the traditional UE are paired.

7. The apparatus of claim 6, further comprising:

a first obtaining module, configured to obtain a first orthogonal mask sequence for mapping a DMRS that is sent to a terminal through a DMRS port11, where the second mapping order is a codeword mapping order of the first orthogonal mask sequence.

8. The apparatus of claim 7, wherein the first obtaining module comprises:

a first obtaining unit for obtaining the data by formula

Obtaining the first orthogonal mask sequence, wherein the w₁₁(i) Denotes an ith codeword in the first orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,

m ' represents a row number of subcarriers occupied by the DMRS in each physical resource block, m ' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, n ' ═ 2 represents a row 11 subcarrier occupied by the DMRS in each physical resource block, and n_PRBIndicating the number of physical resource blocks PRB in the whole bandwidth.

9. The apparatus of claim 6, further comprising:

a second obtaining module, configured to obtain a second orthogonal mask sequence for mapping the DMRS sent to the terminal through the DMRS port13, where the second mapping order is a codeword mapping order of the second orthogonal mask sequence.

10. The apparatus of claim 9, wherein the second obtaining module comprises:

a second obtaining unit for obtaining the formula

Obtaining the second orthogonal mask sequence, wherein the w₁₃(i) Denotes an ith codeword in the second orthogonal mask sequence, i denotes a sequence number of the codeword, i is 0, 1, 2, 3,

m 'represents a row number of subcarriers occupied by the DMRS in each physical resource block, m' ═ 0 represents a row 1 subcarrier occupied by the DMRS in each physical resource block, m '═ 1 represents a row 6 subcarrier occupied by the DMRS in each physical resource block, m' ═ 2 represents a row 1 subcarrier occupied by the DMRS in each physical resource blockRow 1 subcarrier, n_PRBIndicating the number of physical resource blocks PRB in the whole bandwidth.

11. A base station comprising the apparatus for transmitting a demodulation reference signal according to any one of claims 6 to 10.

12. A method for transmitting a demodulation reference signal, applied to a terminal, the method comprising:

receiving a first DMRS which is subjected to first mapping sequence mapping processing and transmitted by a demodulation reference signal DMRS port7 and a DMRS port8 by a base station, and/or receiving a second DMRS which is subjected to second mapping sequence mapping processing and transmitted by a DMRS port11 and a DMRS port13 by the base station; wherein the first mapping order and the second mapping order are opposite; when the new UE and the traditional UE are paired, the base station transmits DMRS to the traditional UE through the DMRS port7 and the DMRS port8, and transmits DMRS to the new UE through the DMRS port11 and the DMRS port 13;

and performing channel estimation according to the first DMRS and/or the second DMRS.

13. An apparatus for transmitting a demodulation reference signal, applied to a terminal, the apparatus comprising:

the base station comprises a receiving module and a transmitting module, wherein the receiving module is used for receiving a first DMRS which is subjected to first mapping sequence mapping processing and is transmitted through a demodulation reference signal DMRS port7 and a DMRS port8, and/or a second DMRS which is subjected to second mapping sequence mapping processing and is transmitted through a DMRS port11 and a DMRS port 13; wherein the first mapping order and the second mapping order are opposite; when the new UE and the traditional UE are paired, the base station transmits DMRS to the traditional UE through the DMRS port7 and the DMRS port8, and transmits DMRS to the new UE through the DMRS port11 and the DMRS port 13;

and the estimation module is used for carrying out channel estimation according to the first DMRS and/or the second DMRS.

14. A terminal, characterized by comprising the apparatus for transmitting a demodulation reference signal according to claim 13.

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