WO2017167156A1

WO2017167156A1 - Dmrs transmission method and device

Info

Publication number: WO2017167156A1
Application number: PCT/CN2017/078321
Authority: WO
Inventors: 蔡剑兴; 肖华华; 弓宇宏; 陈艺戬; 李儒岳; 吴昊; 鲁照华; 李永; 王瑜新
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-01
Filing date: 2017-03-27
Publication date: 2017-10-05
Also published as: CN107294682A

Abstract

The invention provides a demodulation reference signal (DMRS) transmission method and device. The DMRS transmission method comprises: selecting one from two or more different DMRS types; and transmitting a DMRS as indicated by the selected DMRS type. The invention resolves problems of a large RE demand and a low resource utilization rate in the prior art, thereby achieving the effect of reducing the RE demand and increasing the resource utilization rate.

Description

Method and device for transmitting DMRS

Technical field

The present invention relates to the field of communications, and in particular to a method and an apparatus for transmitting a DMRS.

Background technique

In a wireless communication system, a transmitting end and a receiving end generally use multiple antennas for transmitting and receiving to obtain a higher rate. One principle of multiple-input-multiple-output (MIMO) technology is to use some characteristics of the channel to form a multi-layer transmission of matching channel characteristics, so that it can be obtained without increasing bandwidth and power. Significant performance improvements, which are also widely used in current systems. For example, in the Long Term Evolution (LTE) and its enhanced version of the Long Term Evolution-Advanced (LTE A) system, there are multiple modes of multi-antenna transmission, where the transmission mode 2 is Space-frequency diversity, transmission mode 3 is open-loop spatial multiplexing or open-loop MIMO technology, transmission mode 4 is closed-loop spatial multiplexing, transmission mode 5 is multi-user MIMO, and transmission mode 6 is closed-loop spatial multiplexing of single data streams.

Transmission modes

7 and 8 respectively form single-stream and dual-stream beamforming, while transmission mode 9 supports spatial multiplexing of up to 8 layers, and can realize adaptive switching of users and multiple users, and adaptive switching of data layers. Supports open-loop MIMO and closed-loop MIMO modes.

In the above transmission mode, some users need to feed back a Precoding Matrix Indicator (PMI), which is called a closed-loop MIMO technology, and some do not need a feedback precoding matrix indicator (Precoding Matrix Indicator, Referred to as PMI), this is called open-loop MIMO technology. These transmission modes are defined in LTE/LTE A mainly to adapt to the channel characteristics of different users and the receiving capabilities of users. For example, for a user with one receiving antenna, it can only use MIMO technology with 1 multiplex layer. For users with faster channel changes, open-loop MIMO technology can be considered. This is because when the user moves faster, the channel The change is faster. In the feedback period, the precoding information of the closed-loop spatial multiplexing feedback cannot accurately and timely reflect the downlink channel information in the next feedback period of the base station, which may result in performance degradation. The open-loop spatial multiplexing technique has better robustness because it does not need to feed back precoding information.

Earlier versions of LTE/LTE A, such as Release 8/Release 9, use Open-loop MIMO based on Cell-specific Reference Signal (CRS), which is implemented using TM3 (ie, Transmission Mode 3). Moreover, demodulation mainly considers demodulation using a method of CRS. Since CRS supports up to 4 ports, TM3 does not support more than 4 ports.

As more and more transmit ports are configured by the base station, open-loop MIMO technology supporting more ports also needs to be supported. In release 10 and later versions of LTE/LTE A, transport mode 9 and transmission mode 10 are defined. It can be used for open-loop MIMO based on Demodulation Reference Signal (DMRS). In the related LTE/LTE A protocol, the DMRS is a UE-specific Reference Signal associated with PDSCH, that is, a UE-specific reference signal for downlink transmission. Before transmitting the DMRS, the DMRS needs to be pre-coded to the antenna port. , sent out through the antenna port. It generally uses precoding W and the same physical resource block (Physical Resource Block, PRB for short) data or enhanced downlink control channel (enhance Physical Downlink Control) The channel is abbreviated as the ePDCCH. The precoding is the same, so that the terminal does not need to configure the precoding W information when the terminal demodulates the data/enhanced Physical Downlink Control Channel (ePDCCH). The channel-pair data or ePDCCH estimated by the De Modulation Reference Signal (DMRS) is directly demodulated. This pre-coded DMRS is called a pre-coded DMRS. In release 10 to release 13 of LTE/LTE A, DMRS supports up to 8 ports, respectively port{7, 8, 9, 10, 11, 12, 13, 14}. Each port occupies 12 resource units (Resource Element, referred to as RE).

In DMRS-based open-loop MIMO, since the terminal does not feed back precoding information, the base station has no a priori information to determine the downlink matching precoding to transmit data, thereby degrading performance due to inaccurate precoding, especially in Based on the open-loop precoding of granularity of multiple PRBs, once the selected precoding is inappropriate, it is easy to cause the transmission of the entire data block to fail. One way is to divide a PRB pair into multiple resource element groups (Resource Element Group, Referred to as REG, each REG uses a precoding independently, which can effectively traverse different codewords, thereby improving system performance.

Next, the related background of the codebook is explained: the codebook of LTE is also evolving with the evolution of the standard version. In the Release 8 and Release 9, the codebook of the 4 antenna and the codebook of the 2 antenna are single. In the form of a codeword, only one PMI has its value represented as i=0,..., N11-1, and N11 is the number of codewords. In the 8-antenna codebook of Release 10 and the 4-antenna codebook of Release 12, it is the form of double-codebook feedback, that is, the codeword can be written in the form of W=WL*WS, and WL is the codebook of long-term feedback, generally There are N11 groups, each group includes M1 candidate beams, and the user selects a group index of N11 groups to feed back to the base station. This feedback is generally quantized and fed back by PMI1, and its value is generally i1==0,..., N11-1 indicates that N11 is the number of WLs; WS represents a short-term feedback codebook, and its function is to select one of M1 candidate beams in the WL codeword, and for each of the same data layer. The beam selection polarization phase Co-phasing selected by the polarization direction, each codeword in WS is quantized and fed back by PMI2, and its value is i2=0,..., M1-1, M1 is the number of WS, each of which The value of N11 and M1 in the rank is different. For details, refer to the LTE Release 10 protocol.

The codewords before R12 are for the 1D antenna array and belong to the 1D codeword. In the design of the Release 13 codebook, the size of the codebook becomes larger due to the use of more antennas. The topology of the antenna is also generally planar, that is, the antenna with two dimensions is designed with 2D code words. Thus each beam in the codeword WL has a form of 2-dimensional form

Where v _m and u _n are Discrete Fourier Transform (DFT) of the first dimension and the second dimension, respectively, m=1, 2, . . . , N ₁₁ , n=1, 2,... , N ₁₂ .

Representing the kronecker product of v _m and u _n , the first dimension port (the port may include an antenna/port/port/transmission unit/array/array element, etc.), and the number of N2, the second dimension port number N2, The DFT corresponding to the first dimension port is oversampled by O1, and the DFT corresponding to the port of the second dimension is oversampled by O2, and the number of discrete Fourier vectors of the first or second dimension antenna is It is a multiple of the oversampling factor of the number of ports, so there are N11=N1*O1, N12=N2*O2, O1 is the first dimension oversampling factor, and O2 is the second dimension oversampling factor. The codebook of the first dimension in WL is represented by PMI11, and its value is i11=0,...,N11-1, and the codebook of the second dimension is represented by PMI12, and its value is i12=0,...,N12-1. For each of the above PMI11 and PMI12 indexes, there are M1 WS code words, and each WS code word is to select a 2-dimensional beam from WL.

And Co-phasing of different polarization directions, the corresponding codeword index is PMI2, which is represented by i2=0,...,M1-1. Without loss of generality, the codeword of the first dimension port number N11=1 or the second dimension port number N12=1 is called a 1D codeword, and the first dimension port number N11>1 and the second dimension port number N12>1 The code word becomes a 2D code word. If it is a 1D codeword and the single codeword structure is represented by PMI or i, if it is a 1D codeword and is represented by PMI1 and PMI2 in the double codeword structure, the index is jointly represented by i1/i2, if it is a 2D codeword The three codebook indexes of PMI11, PMI12, and PMI2 are collectively represented or jointly represented by indexes i11, i12, and i2.

The 3rd Generation Partnership Project (3GPP) also introduces the concept of channel state information (CSI) process process. The base station can configure multiple CSI processes for the terminal, each CSI. The process is equivalent to a channel state information measurement and feedback process. Each CSI process is independent and can be parameterized separately. In transport mode 9, one process is supported, and in transport mode 10, a maximum of four processors can be supported. The configuration of the channel measurement part and the configuration of the interference measurement part and the feedback mode are defined in the configuration of each CSI process. The interference measurement part may be a single interference measurement configuration csi-IM-ConfigId or a configuration of the interference measurement list csi-IM- ConfigIdList, which is mainly used in the case of Time Division Duplex (TDD) supporting enhanced Interference Management and Traffic Adaptation (eIMTA). The configuration of the CSI process may also include some other configuration information such as pilot power Pc information, codebook restriction (codebook Subset Restriction) bitmap indication information, and 4Tx codebook version selection indication information.

There are two types of channel information measurement and feedback: Class A and Class B. Class A means that the base station transmits a CSI-RS, which is generally a non-precoded pilot. The UE directly performs channel measurement and CSI quantization based on the channel state information measurement pilot CSI-RS, and obtains a Rank Indicator (RI). Precoding Matrix Indicator (PMI)/Channel Quality Indication (CQI). The content is fed back on a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH). Class B refers to the CSI-RS transmitted by the base station, which is generally a precoding pilot. The UE may need to select the precoding pilot first, or the resource set selection of the precoding pilot, or the port group selection, and then based on the selected The CSI-RS pilot performs quantitative feedback of channel information. Class B is further divided into Class B, Kc>1 and Class B, and Kc=1 is in Class B, Kc>1. The terminal needs to select and feed back CSI-RS resource index (CRI) to select information. And calculating corresponding RI/PMI/CQI information based on the CSI-RS measurement resource subset corresponding to the selected CRI. Here, there are Kc sets of independent CSI-RS resources, each set of CSI-RS resources corresponds to one CRI, and has independent Nk CSI-RS port configurations, CSI-RS pattern configuration, pilot sequence configuration, and the like. In Class B, Kc=1, there is only one set of CSI-RS resource, N1 ≤ 8, and generally N1 CSI-RS pilot ports are divided into N1/2 groups, each group corresponding to a different beam, passing WS-only code. The port selected by this feedback, and the co-phasing information of the corresponding beam of the port. Of course, Class B, Kc=1 can also be based on traditional codeword feedback.

For ease of description, and to reduce the repeated description, the transmitting end (ie, the transmitting device), the receiving end (ie, the receiving device), and some concepts, scenarios, and configuration methods are introduced. In a system comprising at least one transmitting end and at least one receiving end, the number of antennas/ports/array elements configured per transmitting end is N, where N is a positive integer greater than or equal to one. The transmitting end transmits data or an enhanced physical downlink control channel (ePDCCH) pilot signal to a user served by the NB PRBs. Each PRB pair includes Nc subcarriers and Ns orthogonal frequency division multiplexing (OFDM)/orthogonal frequency division A set S of Resource Elements (referred to as RE, also referred to as resource granularity or resource particles) of Orthogonal Frequency Division Multiple Access (OFDMA) symbols, which includes Nc*Ns REs. All PRs of the PRB transmission data or ePDCCH are divided into K data REGs, here labeled DATA REG where K is a positive integer greater than 1, and each DATA REG group contains several REs in the same PRB pair, and The REs in different DATA REG groups are not duplicated. K DATA REGs use separate precoding for layer to antenna port mapping. Since there are K different precoding corresponding DATA REGs in the same PRB, in order to perform data detection on the K DATA REGs, the precoded DMRS ports in the same PRB are also divided into K DMRS REG groups, each group pre The coded DMRS port group is mapped to the antenna port by using independent K precoding, and then sent to the receiving end. The receiving end receives M precoded DMRSs, and divides M ports into K DMRS REGs for channel estimation. The DMRS REG performs channel estimation separately and performs data detection and demodulation on the data on the DATA REG associated therewith. Here, a DMRS REG is associated with a DATA REG group, and the k-th DMRS REG is associated with the k-th DATA REG without loss of generality. The association is that the user performs channel estimation with the k-th DMRS REG and estimates The channel obtains the channel estimate of the kth DATA REG region, and performs data detection, demodulation, decoding, etc. on the kth DATA REG.

In the related art, only precoded DMRS is used as a demodulation reference signal in the same PRB pair. On the one hand, if the number of layers of data to be transmitted is R, and K different DATA REGs are allocated to the transmission data or ePDCCH region in the same PRB pair, and each DATA REG needs a DMRS REG associated with it, then a total of K is required. *R DMRS ports. When K is large or R is large, the number of DMRS ports required will be relatively large, that is, DMRS will occupy a large number of REs, resulting in a decrease in resource utilization.

Aiming at the problem that the RE occupancy in the related technology is large and the resource utilization rate is low, an effective solution has not been proposed yet.

Summary of the invention

The present invention provides a method and an apparatus for transmitting a DMRS, so as to solve at least the problem that the RE occupancy is large and the resource utilization rate is low in the related art.

According to an embodiment of the present invention, a method for transmitting a demodulation reference signal DMRS is provided, including: selecting a DMRS type from at least two different DMRS types; and transmitting the selected DMRS indicated by the DMRS type.

Optionally, the DMRS indicated by the DMRS type includes a first type of DMRS and a second type of DMRS, where the first type of DMRS includes a precoded DMRS or a beamformed Beamformed DMRS; and/or the The second type of DMRS includes a non-precoded DMRS.

Optionally, when the selected DMRS indicated by the DMRS type is the DMRS of the first type, sending the selected DMRS indicated by the DMRS type includes: directly transmitting the transport layer to the mapping process from the transport layer to the DMRS port One is mapped to the DMRS port.

Optionally, when the selected DMRS indicated by the DMRS type is the DMRS of the first type, sending the selected DMRS indicated by the DMRS type includes: mapping the first type of DMRS from the DMRS port to the antenna In the process of the port, the DMRS is processed by using a precoding Wp, wherein the Wp is a non-unit matrix.

Optionally, the method includes at least one of the following: the Wp is the same as the precoding Wd used by the data resource granularity group DATA REG associated with the first type of DMRS; the number of the first type of DMRS ports It is equal to the number of layers of the transport layer.

Optionally, when the selected DMRS indicated by the DMRS type is the DMRS of the second type, sending the selected DMRS indicated by the DMRS type includes: in the mapping process from the transport layer to the DMRS port, the transport layer After multiplying by the precoding Wd, it is mapped to the DMRS port.

Optionally, when the selected DMRS indicated by the DMRS type is the DMRS of the second type, sending the selected DMRS indicated by the DMRS type includes: mapping the second type of DMRS from the DMRS port to the antenna port In the process of performing one-to-one mapping processing on the DMRS port, or in processing from the DMRS port to the antenna port, the DMRS is processed by using a pre-coded WI.

Optionally, at least one of the following: the precoding WI is different from the precoding Wd used by the data resource granularity group DATA REG associated with the second type of DMRS; the number of the second type of DMRS ports The number of rows of the Wd is equal; the number of the second type of DMRS ports is equal to the number of the antenna ports; and the WI is an identity matrix.

Optionally, the method further includes: transmitting, by using high layer signaling and/or physical layer signaling, a type of the selected DMRS.

Optionally, selecting a DMRS type from at least two different DMRS types according to at least one of the following parameters, a number of DMRS ports of the first type, a channel rank, a number of DMRS ports of the second type, and a data resource granularity group DATA REG A number of choices.

Optionally, when the product of the channel rank and the number of DATA REGs is less than or equal to the number of DMRS ports of the second type, selecting a first type of DMRS; and/or, when the channel rank is When the product of the number of DATA REGs is greater than the number of DMRS ports of the second type, the second type of DMRS is selected.

According to another embodiment of the present invention, a DMRS transmission method is provided, including: transmitting a demodulation reference signal DMRS, where the number of DMRS ports is N.

Optionally, the number of the DMRS ports is indicated according to the following manner: indicating the number of the DMRS ports according to high layer signaling and/or physical layer signaling.

Optionally, the number of the DMRS ports is indicated according to the following manner: indicating the number of the DMRS ports according to the PQI information and/or the channel state information reporting type CSI report type.

Optionally, the number of the DMRS ports is indicated by at least one of: indicating by a parameter of the number of the DMRS ports included in a table corresponding to the PQI information; and CSI included by the CSI report type The process process indicates that the number of the DMRS ports is the Channel number information of the CSI process measures the number of ports of the pilot CSI-RS resource; when the CSI report type contains CSI When the number of processes is 1, and the feedback class of the CSI process is Class B, the number of the DMRS ports is specific to two or more channel state information measurement pilot CSI-RS resources included in the CSI process. The number of ports of the CSI-RS resource, the specific CSI-RS resource is a CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance; when the number of CSI processes included in the CSI report type is greater than one The number of the DMRS ports is determined according to a specified CSI process among the multiple CSI processes included in the CSI report type.

Optionally, determining the number of the DMRS ports according to the specified CSI process in the multiple CSI processes included in the CSI report type includes at least one of: when the feedback category of the specified CSI process is Class A The number of the DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the specified CSI process; when the feedback category of the specified CSI process is Class B, the DMRS The number of ports is the number of ports of a specific CSI-RS resource in the pilot CSI-RS resource of the two or more channel state information included in the specified CSI process, where the specific CSI-RS resource is The received CSI-RS resource indexes the CSI-RS resource corresponding to the CRI.

According to another embodiment of the present invention, a method for transmitting a demodulation reference signal DMRS is provided, including: configuring at least two different types of DMRSs in a physical resource block PRB pair; transmitting the At least two different types of DMRS.

Optionally, the at least two different types of DMRSs include a first type of DMRS and a second type of DMRS, where the first type of DMRS comprises a precoded DMRS or a beamformed Beamformed DMRS; and/or, The second type of DMRS includes a non-precoded DMRS.

Optionally, the number of the first type of DMRSs configured in the PRB pair is M, the number of the second type of DMRSs is N, and the K1 data resource granularity groups DATA REG and the first in the PRB pair. A type of DMRS port is associated, K2 DATA REGs within the PRB pair are associated with a second type of DMRS port, and precoding Wd for the K2 DATA REGs is transmitted.

Optionally, the method further includes: indicating, by using the high layer signaling and/or the physical layer signaling, that the PRB pair is configured with two types of DMRSs at the same time, and sending the values of the M, N, K1, and K2.

According to another embodiment of the present invention, a method for demodulating reference signal DMRS reception is provided, comprising: receiving a DMRS indicated by a selected DMRS type, wherein the selected DMRS type is from at least two different DMRS types Selecting a DMRS type; performing channel estimation using the DMRS according to the type of the DMRS; and performing data demodulation on the data resource granularity group DATA REG associated with the DMRS.

Optionally, the at least two different DMRS types of DMRSs include a first type of DMRS and a second type of DMRS, where the first type of DMRS comprises a precoded DMRS or a beamformed Beamformed DMRS; and Or, the second type of DMRS includes a non-precoded DMRS.

Optionally, performing channel estimation by using the DMRS according to the type of the DMRS and performing data demodulation on the data resource granularity group DATA REG associated with the DMRS includes: when determining that the DMRS is the first type of DMRS, directly Channel estimation using the received DMRS, and correlating the DMRS with channel estimation results Data resource granularity group DATA REG performs data demodulation; and/or, when determining that the DMRS is a second type of DMRS, multiplies the received DMRS by a pre-received precoding Wd, and multiplies by using The obtained result is subjected to channel estimation; data demodulation is performed on the data resource granularity group DATA REG associated with the DMRS by using a channel estimation result.

Optionally, the method further includes: determining the selected DMRS type by using high layer signaling and/or physical layer signaling.

Optionally, determining the selected DMRS type according to at least one of the following parameters: a number of DMRS ports of the first type, a channel rank, a number of DMRS ports of the second type, and a number of data resource granularity groups DATA REG.

Optionally, when the product of the channel rank and the number of DATA REGs is less than or equal to the number of DMRS ports of the second type, determining that the selected DMRS type is the first type; and/or, when When the product of the channel rank and the number of DATA REGs is greater than the number of DMRS ports of the second type, it is determined that the selected DMRS type is the second type.

According to another embodiment of the present invention, a DMRS receiving method is provided, including: receiving a demodulation reference signal DMRS, where the number of DMRS ports is N.

Optionally, determining the number of the DMRS ports according to the following manner: determining the number of the DMRS ports by using high layer signaling and/or physical layer signaling.

Optionally, determining the number of the DMRS ports according to the following manner: determining the number of the DMRS ports according to the PQI information and/or the channel state information reporting type CSI report type.

Optionally, determining the number of the DMRS ports according to at least one of the following manners: determining, by using a parameter of the number of the DMRS ports included in a table corresponding to the PQI information, by using the CSI; The CSI process process included in the report type determines the number of the DMRS ports, and includes at least one of the following: when the number of CSI processes included in the CSI report type is 1, and the feedback category of the CSI process is Class A, The number of the DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the CSI process; when the number of CSI processes included in the CSI report type is 1, and the feedback of the CSI process When the class is Class B, the number of the DMRS ports is the number of ports of the specific CSI-RS resource in the pilot CSI-RS resource of the two or more channel state information measurement indicators included in the CSI process, where the specific The CSI-RS resource is a CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance; when the number of CSI processes included in the CSI report type is greater than 1, each of the DMRS ports Determined according to a plurality of CSI process the CSI report type included in the designated CSI process.

According to another embodiment of the present invention, a DMRS receiving method is provided, including: a physical resource block PRB Receiving at least two different types of DMRSs internally; performing channel estimation using the at least two different types of DMRSs and performing data demodulation on the data resource granularity groups DATA REG of the at least two different types of DMRS associations.

Optionally, the method further includes: receiving high layer signaling and/or physical layer signaling; determining, from the high layer signaling and/or physical layer signaling, the following information: a type of the DMRS in the PRB pair, The number M of the first type of DMRS in the PRB pair, the number N of the second type of DMRS, and the number K1 of the data resource granularity group DATA REG associated with the first type of DMRS port in the PRB pair, The number of DATA REGs associated with the second type of DMRS port in the PRB pair is K2, and the precoding Wd is received.

According to another embodiment of the present invention, there is provided a transmitting apparatus for demodulating a reference signal DMRS, comprising: a first determining module, configured to select a DMRS type from at least two different DMRS types; a first sending module, setting The DMRS indicated for the selected DMRS type is transmitted.

According to still another embodiment of the present invention, there is also provided a storage medium comprising a stored program, wherein the program is executed to perform the method of any of the above.

According to still another embodiment of the present invention, there is also provided a processor for running a program, wherein the program is executed to perform the method of any of the above.

With the present invention, a DMRS type is selected from at least two different DMRS types; the selected DMRS type indicated DMRS is transmitted. Therefore, the type of DMRS is switched according to the specific situation, and the problem that the RE occupancy is large and the resource utilization rate is low in the related technology is solved, thereby achieving the effect of reducing the RE occupancy and improving the resource utilization.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flow chart of transmission of a first type of DMRS according to an embodiment of the present invention;

2 is a flow chart of transmission of a second type of DMRS according to an embodiment of the present invention;

3 is a flow chart of transmission of a third type of DMRS according to an embodiment of the present invention;

4 is a flowchart of a first DMRS receiving method according to an embodiment of the present invention;

FIG. 5 is a flowchart of a second DMRS receiving method according to an embodiment of the present invention; FIG.

6 is a flowchart of a third DMRS receiving method according to an embodiment of the present invention;

7 is a diagram showing a relationship between a data stream, a DMRS port, and an antenna port in a precoded DMRS according to an embodiment of the present invention;

8 is a diagram showing a relationship between a data flow, a DMRS port, and an antenna port mapping in a non-precoded DMRS according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a frame structure of a DMRS according to an embodiment of the present invention; FIG.

10 is a schematic diagram of dividing data RE on one PRB into two DATA REGs according to an embodiment of the present invention;

11 is a structural block diagram of a transmitting apparatus of a first type of DMRS according to an embodiment of the present invention;

FIG. 12 is a structural block diagram of a second DMRS transmitting apparatus according to an embodiment of the present invention; FIG.

FIG. 13 is a structural block diagram of a third DMRS transmitting apparatus according to an embodiment of the present invention; FIG.

FIG. 14 is a structural block diagram of a receiving apparatus of a first DMRS according to an embodiment of the present invention; FIG.

FIG. 15 is a structural block diagram of a second DMRS receiving apparatus according to an embodiment of the present invention; FIG.

16 is a block diagram showing the structure of a receiving apparatus of a third type of DMRS according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In the following embodiments, a transmitting end (also referred to as a transmitting device) and/or a receiving end (which may also be referred to as a receiving device) are involved. The following describes the transmitting device and the receiving device:

In the downlink, the transmitting end includes, but is not limited to, various wireless communication devices such as a macro base station, a micro base station, and a wireless access point. The receiving end includes but is not limited to: various wireless communication devices such as a data card, a mobile phone, a notebook computer, a personal computer, a tablet computer, a personal digital assistant, and Bluetooth.

In the uplink, the transmitting end includes, but is not limited to, various wireless communication devices such as a data card, a mobile phone, a notebook computer, a personal computer, a tablet computer, a personal digital assistant, and Bluetooth. The receiving end includes, but is not limited to, various wireless communication devices such as a macro base station, a micro base station, and a wireless access point.

In this embodiment, a method for transmitting a DMRS is provided. FIG. 1 is a flowchart of sending a first DMRS according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:

Step S102: Select a DMRS type from at least two different DMRS types.

Step S104: Send the selected DMRS indicated by the DMRS type.

Among them, the above operation may be performed by the transmitting device.

Through the above steps, the sending device can select the type of the DMRS according to the specific situation, that is, the type of the DMRS can be switched according to the specific situation, and the problem that the RE occupancy is large and the resource utilization rate is low in the related technology is solved, thereby reducing the RE. The amount of occupancy increases the effect of resource utilization.

In an optional embodiment, the DMRS indicated by the DMRS type includes a first type of DMRS and a second type of DMRS, where the first type of DMRS includes a precoded DMRS or a beamformed Beamformed DMRS; and/or The second type of DMRS includes a non-precoded DMRS (ie, Non-precoded DMRS).

In an optional embodiment, when the DMRS indicated by the selected DMRS type is the DMRS of the first type, the DMRS that is sent by the selected DMRS type includes: in the mapping process from the transport layer to the DMRS port, directly The transport layer is mapped to the DMRS port one by one, that is, when the transport layer is mapped to the DMRS port, it is directly mapped, and no correlation coding process is performed.

In an optional embodiment, when the DMRS indicated by the selected DMRS type is the DMRS of the first type, sending the selected DMRS indicated by the DMRS type includes: mapping the first type of DMRS from the DMRS port to the In the process of the antenna port, the DMRS is processed by using a precoding Wp, wherein the Wp is a non-unit array, that is, the signal on the DMRS port is encoded during the mapping process from the DMRS port to the antenna port (the The precoding process can be multiplied by precoding Wp). In this embodiment, before the DMRS is sent through the antenna port, the DMRS may be encoded, thereby ensuring successful transmission of the DMRS.

In an optional embodiment, the foregoing method includes at least one of the following: the Wp is the same as the precoding Wd used by the data resource granularity group DATA REG associated with the first type of DMRS; and the number of the first type of DMRS ports It is equal to the number of layers of the above transport layer.

In an optional embodiment, when the selected DMRS indicated by the DMRS type is the second type of DMRS, sending the DMRS indicated by the selected DMRS type includes: transmitting the layer during the mapping process from the transport layer to the DMRS port Multiply the precoded Wd and map it to the DMRS port.

In an optional embodiment, when the selected DMRS indicated by the DMRS type is the second type of DMRS, sending the DMRS indicated by the selected DMRS type includes: mapping the second type of DMRS from the DMRS port to the antenna port. In the process of performing one-to-one mapping processing on the DMRS port, or in mapping from the DMRS port to the antenna port, the DMRS is processed using the pre-coded WI. In this embodiment, when the type of the DMRS is the second type, the DMRS can be processed by using the unit array, thereby ensuring that the DMRS is one-to-one mapped when mapped to the antenna port. In this embodiment, the value of the precoding Wd used by the data resource granularity group DATA REG associated with the Wd and the DMRS may be consistent.

In an optional embodiment, the foregoing method includes at least one of the following: the precoding WI is different from the precoding Wd used by the data resource granularity group DATA REG associated with the second type of DMRS; and the second type of DMRS port is used. The number of lines is equal to the number of lines of Wd; the number of the second type of DMRS ports is equal to the number of antenna ports; the WI is an identity matrix.

In an optional embodiment, the method further includes: transmitting, by using higher layer signaling and/or physical layer signaling, the selected one The type of DMRS. In this embodiment, after the sending device determines the type of the DMRS, the determined type may be sent, so that the receiving device may perform channel estimation and data demodulation processing according to the type of the specific DMRS.

In an optional embodiment, the DMRS type, the number of DMRS ports of the first type, the channel rank, and the number of DMRS ports of the second type may be selected from at least two different DMRS types according to at least one of the following parameters: Data resource granularity group DATA REG number selection.

In an optional embodiment, when the product of the channel rank and the number of DATA REGs is less than or equal to the number of DMRS ports of the second type, the first type of DMRS is selected; and/or, when the channel rank and DATA are When the product of the number of REGs is greater than the number of DMRS ports of the second type, the second type of DMRS is selected. The channel rank in this embodiment includes, but is not limited to, the concepts of the number of data transmission layers, the number of data transmission streams, the number of data streams, the number of data layers, the channel Rank, the RI, and the rank.

A DMRS sending method is also provided in this embodiment. FIG. 2 is a flowchart of a second DMRS sending according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202, transmitting a demodulation reference signal DMRS, where the number of DMRS ports is N.

Among them, the above operation may be performed by the transmitting device.

The type of the DMRS may be the first type or the second type.

In an optional embodiment, the number of DMRS ports may be indicated according to the following manner: the number of DMRS ports is indicated according to high layer signaling and/or physical layer signaling.

In an optional embodiment, the number of DMRS ports may be indicated according to the following manner: the number of DMRS ports is indicated according to PQI (PDSCH RE mapping and Quasi co-location Indicator) information or channel state information reporting type CSI report type. It should be noted that the foregoing types of signaling are only a few preferred embodiments, and other types of signaling may be used to configure the number of DMRS ports. The following describes how to notify the number of DMRS ports:

In an optional embodiment, the number of the DMRS ports is indicated by at least one of the following manners: indicating by a parameter of a number of DMRS ports included in a table corresponding to the PQI information; and a CSI process process included by the CSI report type The indication includes the following: at least one of the following conditions: when the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class A, the number of DMRS ports is the channel state information measurement pilot CSI of the CSI process - The number of ports of the RS resource; when the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class B, the number of DMRS ports is two or more channel state information measurements included in the CSI process. The number of ports of the specific CSI-RS resource in the pilot CSI-RS resource, the specific CSI-RS resource is the CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance; when the CSI report type includes the CSI When the number of processes is greater than 1, the number of DMRS ports is determined according to the specified CSI process in multiple CSI processes included in the CSI report type. Set.

In an optional embodiment, the number of the foregoing DMRS ports is determined according to the specified CSI process in the multiple CSI processes included in the CSI report type, including at least one of the following: when the specified CSI process feedback category In the case of Class A, the number of the DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the specified CSI process; when the feedback type of the specified CSI process is Class B, the number of DMRS ports The number of ports of a specific CSI-RS resource in the pilot CSI-RS resource is measured for two or more channel state information included in the specified CSI process, where the specific CSI-RS resource is a pre-received CSI-RS resource index. CSI-RS resource corresponding to CRI.

In this embodiment, a method for transmitting a demodulation reference signal DMRS is also provided. FIG. 3 is a flowchart of sending a third DMRS according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:

Step S302, configuring at least two different types of DMRSs in one physical resource block PRB pair;

Step S304, transmitting the at least two different types of DMRSs on the PRB pair.

Among them, the above operation may be performed by the transmitting device.

Through the above steps, the sending device can simultaneously send multiple types of DMRS according to the specific situation, which solves the problem that the RE occupancy is large and the resource utilization rate is low in the related technologies, thereby reducing the RE occupancy and improving the resource utilization. effect.

In an optional embodiment, the foregoing indicating that the two different types of DMRSs comprise a first type of DMRS and a second type of DMRS, wherein the first type of DMRS comprises a precoded DMRS or a beamformed Beamformed DMRS; / or, the second type of DMRS includes a non-precoded DMRS (ie, Non-precoded DMRS).

In an optional embodiment, the number of the first type of DMRSs configured in the PRB pair is M, the number of the second type of DMRSs is N, and the K1 data resource granularity groups DATA REG in the PRB pair. Associated with the first type of DMRS port, the K2 DATA REGs within the above PRB pair are associated with the second type of DMRS port.

In an optional embodiment, the foregoing method further includes: performing high-layer signaling, where the high-layer signaling may be high-layer RRC signaling, and the high-layer RRC signaling included in the first display signaling may be the same signaling. , may also be different signaling) and/or physical layer signaling (the physical layer signaling included in the first display signaling may be the same signaling, or may be different signaling), at least the foregoing PRB pair Two types of DMRSs are configured simultaneously, and the values of M, N, K1, and K2 described above are transmitted.

A DMRS receiving method is also provided in this embodiment. FIG. 4 is a flowchart of a first DMRS receiving method according to an embodiment of the present invention. As shown in FIG. 4, the process includes the following steps:

Step S402, receiving a DMRS indicated by the selected DMRS type, where the selected DMRS type is a DMRS type selected from at least two different DMRS types;

Step S404, performing channel estimation by using the DMRS according to the type of the DMRS and performing data demodulation on the data resource granularity group DATA REG associated with the DMRS.

Wherein, the above operation may be performed by the receiving device.

Through the above steps, the type of the DMRS received by the receiving device is a type determined by the sending device according to a specific situation, that is, The sending device performs the operation of switching the type of the DMRS according to the specific situation, thereby solving the problem that the RE occupancy is large and the resource utilization rate is low in the related technology, thereby achieving the effect of reducing the RE occupancy and improving the resource utilization.

In an optional embodiment, the at least two different DMRS types of DMRSs include a first type of DMRS and a second type of DMRS, wherein the first type of DMRS comprises a precoded DMRS or a beamformed Beamformed DMRS And/or, the second type of DMRS includes a non-precoded DMRS (ie, Non-precoded DMRS).

In an optional embodiment, performing channel estimation by using DMRS according to the type of the foregoing DMRS and performing data demodulation on the data resource granularity group DATA REG associated with the DMRS includes: directly determining receiving when the DMRS is the first type of DMRS Receiving the above DMRS for channel estimation, and performing data demodulation on the DMRS-associated data resource granularity group DATA REG by using the channel estimation result; and/or, when determining that the DMRS is the second type of DMRS, the received DMRS and the received DMRS are The pre-coded Wd from the transmitting device is multiplied in advance, and the result obtained by the multiplication is used for channel estimation; and the data resource granularity group DATA REG associated with the DMRS is demodulated by the channel estimation result.

In an optional embodiment, the method further includes: determining the selected DMRS type by using high layer signaling and/or physical layer signaling.

In an optional embodiment, the selected DMRS type is determined according to at least one of the following parameters: a first type of DMRS port number, a channel rank, a second type of DMRS port number, and a data resource granularity group DATA REG Number selection. The channel rank in this embodiment includes, but is not limited to, the concepts of the number of data transmission layers, the number of data transmission streams, the number of data streams, the number of data layers, the channel Rank, the RI, and the rank.

In an optional embodiment, when the product of the channel rank and the number of DATA REGs is less than or equal to the number of DMRS ports of the second type, determining that the selected DMRS type is the first type; and/or, when the channel rank When the product of the number of DATA REGs is greater than the number of DMRS ports of the second type, it is determined that the selected DMRS type is the second type.

A DMRS receiving method is also provided in this embodiment. FIG. 5 is a flowchart of a second DMRS receiving method according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps:

Step S502, receiving a demodulation reference signal DMRS, where the number of DMRS ports is N.

Wherein, the above operation may be performed by the receiving device. The type of the DMRS described above may be the first type or the second type.

In an optional embodiment, the number of DMRS ports may be determined according to the following manner: determining the number of the DMRS ports by high layer signaling and/or physical layer signaling.

In an optional embodiment, the number of DMRS ports may be determined according to the following manner: determining the number of the DMRS ports according to the PQI information or the channel state information reporting type CSI report type.

In an optional embodiment, the number of DMRS ports is determined according to at least one of the following manners: determining the number of the DMRS ports by using parameters of the number of DMRS ports included in the table corresponding to the PQI information; and including by using a CSI report type The CSI process process determines the number of the above DMRS ports, including at least one of the following: when the CSI report The number of CSI processes included in the type is 1, and the number of DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the CSI process when the feedback class of the CSI process is Class A; when the CSI report type is included When the number of CSI processes is 1, and the feedback class of the CSI process is Class B, the number of DMRS ports is more than two CSI-RSs in the CSI-RS resource of the CSI process. The number of ports of the resource, the specific CSI-RS resource is the CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance; when the number of CSI processes included in the CSI report type is greater than 1, the number of DMRS ports is based on The specified CSI process in multiple CSI processes included in the CSI report type is determined.

In an optional embodiment, the number of the foregoing DMRS ports is determined according to the specified CSI process in the multiple CSI processes included in the CSI report type, including at least one of the following: when the feedback category of the specified CSI process is Class A When the number of DMRS ports is the channel state information of the specified CSI process, the number of ports of the pilot CSI-RS resource is measured; when the feedback type of the specified CSI process is Class B, the number of DMRS ports is the specified CSI. The number of ports of the specific CSI-RS resource in the pilot CSI-RS resource is measured by the two or more channel state information included in the process, and the specific CSI-RS resource is the CSI corresponding to the CSI-RS resource index CRI received in advance. -RS resource.

In an optional embodiment, when sending the DMRS, the sending device can simultaneously send multiple types of DMRSs. For example, the sending device configures Type 1 DMRS and Type 2 DMRS in one transmission resource block. For the receiving device, after receiving the DMRS of type 1 and the DMRS of type 2 in the same transmission resource block, the DMRS of type 1 and the DMRS of type 2 may be DATA associated with different types of DMRS, respectively. The REG performs channel estimation, detection and demodulation.

A DMRS receiving method is also provided in this embodiment. FIG. 6 is a flowchart of a third DMRS receiving method according to an embodiment of the present invention. As shown in FIG. 6, the process includes the following steps:

Step S602, receiving at least two different types of DMRSs in one physical resource block PRB pair;

Step S604, performing channel estimation by using the two different types of DMRSs and performing data demodulation on the data resource granularity group DATA REG associated with the at least two different types of DMRSs.

Wherein, the above operation may be performed by the receiving device.

Through the foregoing steps, the type of the DMRS received by the receiving device may be a type determined by the sending device according to the specific situation, thereby solving the problem that the RE occupancy is large and the resource utilization rate is low in the related technology, thereby reducing the RE occupancy. Improve the effect of resource utilization.

In an optional embodiment, the at least two different types of DMRSs include a first type of DMRS and a second type of DMRS, where the first type of DMRS comprises a precoded DMRS or a beamformed Beamformed DMRS; / or, the second type of DMRS includes a non-precoded DMRS (ie, Non-precoded DMRS).

In an optional embodiment, the method further includes: receiving high layer signaling and/or physical layer signaling; from the high layer signaling (the high layer signaling may be high layer RRC signaling, and the first display letter described above) The high layer RRC signaling included may be the same signaling, or may be different signaling) and/or physical layer signaling (the physical layer included with the first display signaling described above) The signaling may be the same signaling, or may be different signaling. The following information is determined: the type of the DMRS in the PRB pair, the number M of the first type of DMRS in the PRB pair, and the number of the second type of DMRS. N, the number K1 of data resource granularity groups DATA REG associated with the first type of DMRS port within the PRB pair, and the number K2 of DATA REGs associated with the second type of DMRS port within the PRB pair.

The present invention will be described below in conjunction with specific embodiments:

In order to facilitate the understanding of the description in the embodiment, the present invention is further described herein from the perspective of the transmitting end (ie, the above-mentioned transmitting device) and the receiving end (ie, the above-mentioned receiving device), in the following embodiments, The process of precoding DMRS and non-precoding DMRS is introduced by taking the precoding DMRS and/or non precoding DMRS as an example.

On the sending end:

For the precoded DMRS, as shown in FIG. 7, the codeword stream is first mapped into an R layer data stream after layer mapping processing, and then R DMRSs are respectively inserted into the R layer data stream, and then each layer of data is precoded. Then map to the antenna port. For the non-precoded DMRS, as shown in FIG. 8, the codeword stream is first mapped to the R layer data stream after layer mapping processing, and then the R layer data stream is precoded, and the data after the precoding process is reinserted. DMRS (unlike precoding DMRS, where the DMRS is not precoded), and finally maps the data to the antenna port.

At the receiving end:

For precoding DMRS, since channel estimation based on precoding DMRS can directly reflect the channel experienced by the transport layer, including precoding information, it can be directly used for coherent demodulation of different layers, that is, the transmitting end does not need to The pre-coded usage information is notified to the receiving end, and the receiving end can also perform data demodulation. For the non-precoded DMRS, at this time, the receiving end does not know what precoding is used by the transmitting end from the received signal on the DMRS port. Therefore, after using the non-precoded DMRS for channel estimation, the transmitting end is required. The precoding information used by the transmitting end to transmit the DMRS is notified to the receiving end, and then the receiving end can use the channel estimation result and the precoding information to demodulate the data symbols.

The above description will be described below in conjunction with specific embodiments:

Example 1

In this embodiment, the type of DMRS can be configured/determined according to explicit signaling.

For the sender:

The sender directly configures the type of the DMRS through explicit signaling.

When the type of the configured DMRS is pre-coded DMRS, the sender divides the REs in each PRB pair into K DATA REGs, G1, G2, ..., GK, and each group includes M1, M2, ..., MK RE, and one RE in the same PRB pair belongs to and belongs to only one DATA REG group, and divides M DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK. The transmitting end independently uses the precoding Ci to respectively the kth DMRS port group Sk performs precoding, and the sender also precodes the kth DATA REG associated with it using Ci. Thus, the transmitting end maps the K precoded DMRS ports and K DATA REGs to the antenna port for transmission. At the same time, the transmitting end transmits to the precoding matrix of the user Ci as N*R, where i=1, 2, . . . , K; R is the number of layers of the transmitted data.

When the type of the configured DMRS is non-precoded DMRS, the sender divides the REs in each PRB pair into K DATA REGs, G1, G2, ..., GK, and each group includes M1, M2, ..., MK. One RE, and one RE in the same PRB pair belongs to and belongs to only one DATA REG group, and divides M DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK. For the kth DMRS port and the kth DATA REG associated therewith, the transmitting end directly maps the signal on the DMRS port to the antenna port, but maps the kth DATA REG to the precoding matrix Wd and then maps Go to the antenna port.

For the receiving end:

The receiving end receives explicit signaling, and the signaling indication content can determine the type of the received DMRS. The receiving end divides the M pre-coded DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK, and simultaneously divides the REs in the PRB pair into K DATA REG, G1, G2, ..., GK, each group includes M1, M2, ..., MK REs, and one RE in the same PRB pair belongs to and belongs to only one DATA REG group.

When the receiving end receives the pre-coded DMRS, the receiving end can directly use the signal on the DMRS port for channel estimation, and then use the result of the channel estimation to perform data demodulation on the DATA REG associated with it.

When the receiving end receives the non-precoded DMRS, the receiving end also receives K precoding matrices Ck (corresponding to Wd above), where k=1, 2, . . . , K. The receiving end multiplies the received precoding matrix Ck by the signal on the kth non-precoded DMRS port group, performs channel estimation according to the multiplied signal, and then uses the channel estimation result to associate with the channel estimation result. The kth DATA REG performs data demodulation.

Example 2

In this embodiment, the type of the DMRS may be configured/determined according to implicit signaling, that is, the number of layers or channel rank R that may be transmitted according to data, the number of non-precoded DMRS ports N, and the number of divided DMRS port groups K Configuration / OK.

For the sender:

The number of layers sent by the sender according to the data or the channel rank R, the number of non-precoded DMRS antenna ports N, and the number K of DMRS port groups in a PRB pair. When the constraint condition K*R>N is satisfied, the sender configuration Non-precoded DMRS.

The sender divides the REs in each PRB pair into K DATA REGs, G1, G2, ..., GK, each group including M1, M2, ..., MK REs, and one RE in the same PRB pair belongs to and It belongs to only one DATA REG group, and simultaneously divides M DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK. For the kth DMRS port and the kth DATA REG associated therewith, the transmitting end directly maps the signal on the DMRS port to the antenna port, but maps the kth DATA REG to the precoding matrix Wd and then maps Go to the antenna port.

For the receiving end:

The number of layers sent by the receiving end according to the data or the channel rank R, the number of non-precoded DMRS ports N, and the number K of DMRS port groups in a PRB pair. When the constraint condition K*R>N is satisfied, the receiving end determines the reception. The DMRS type to be obtained is a non-precoded DMRS.

The receiving end divides the M pre-coded DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK, and simultaneously divides the REs in the PRB pair into K DATA REG, G1, G2, ..., GK, each group includes M1, M2, ..., MK REs, and one RE in the same PRB pair belongs to and belongs to only one DATA REG group. The receiving end also receives K precoding matrices Ck, where k = 1, 2, ..., K. The receiving end performs channel estimation by using the received precoding matrix Ck and the signal on the kth non-precoded DMRS port group, and then performs data demodulation on the kth DATA REG associated with the result of the channel estimation.

The frame structure of LTE/LTE A is used to illustrate the effect of the value of various parameters on the DMRS type. For example, in a DMRS frame structure with only 12 REs, as shown in Figure 9, M takes the value 2, port 7 and port 8 12 orthogonal DMRS REs are shared by orthogonal cover codes (OCC), the number of data layers transmitted is 2, DMRS is also divided into two groups, namely K=2, the number of antenna ports is N=2, and the PRB pairs are The REs in the group are also divided into two groups, as shown in Fig. 10, DATA REG1 and DATA REG2, and port 7 is associated with DATA REG1, and port 8 is associated with DATA REG2. According to the constraint relationship K*R=2*2>N, then in the transmitting end, the DMRSs on port 7 and port 8 do not need to be precoded to directly map to the antenna port transmission, and DATA REG1 and DATA REG2 respectively use The coding matrices C1 and C2 are precoded and then mapped to antenna port transmissions. The receiving end determines that the received DMRS is a non-precoded DMRS according to the constraint relationship K*R=2*2>N, and then the receiving end receives the DMRS of the two ports port 7 and port 8 and the two precoding matrices C1 and C2. The receiving end performs channel estimation using the signal on port 7 and the precoding matrix C1, and performs data demodulation on DATA REG1 using the estimated channel. The receiving end performs channel estimation using the signal on port 8 and the precoding matrix C2, and performs data demodulation on DATA REG2 using the estimated channel. Where C1 and C2 are N*2 precoding matrices.

Example 3

In this embodiment, the type of the DMRS may be configured/determined according to implicit signaling, that is, according to the number of layers of data transmission or the channel rank R, the number of precoded DMRS ports M, and the number of divided DMRS port groups K/ determine.

For the sender:

The sender transmits the number of layers of the DMRS antenna port M and the number of DMRS port groups in a PRB pair according to the number of layers or the channel rank R of the data transmission. When the constraint condition K*R ≤ M is satisfied, the configuration of the sender is pre-configured. Encoded DMRS.

The sender divides the REs in each PRB pair into K DATA REGs, G1, G2, ..., GK, each group including M1, M2, ..., MK REs, and one RE in the same PRB pair belongs to and It belongs to only one DATA REG group, and simultaneously divides M DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK. The transmitting end multiplies the k-th DMRS port and the k-th DATA REG associated with it by the same pre-coding matrix Wd, and maps the multiplied signal to the antenna port for transmission.

For the receiving end:

The receiving end determines the number of layers of the DMRS port M and the number K of DMRS port groups in a PRB pair according to the number of layers or the channel rank R of the data transmission. When the constraint condition K*R ≤ M is satisfied, the receiving end determines to receive The DMRS type is precoded DMRS.

The receiving end divides the M pre-coded DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK, and simultaneously divides the REs in the PRB pair into K DATA REG, G1, G2, ..., GK, each group includes M1, M2, ..., MK REs, and one RE in the same PRB pair belongs to and belongs to only one DATA REG group. The receiving end can directly perform channel estimation on the signals on the K DMRS ports, and then perform data demodulation on the k-th DATA REG associated with the result of the channel estimation.

The frame structure of LTE/LTE A is used to illustrate the effect of the value of various parameters on the DMRS type. For example, in a DMRS frame structure with only 12 REs, as shown in Figure 9, M takes the value 2, port 7 and port 8 12 DMRS REs are shared by orthogonal cover codes (OCC), the number of data layers transmitted is 1, the DMRS is divided into two groups, that is, K=2, and the REs in the PRB pair are also divided into two groups. As shown in Figure 10, DATA REG1 and DATA REG2, and port7 is associated with DATA REG1, and port 8 is associated with DATA REG2. According to the constraint relationship K*R=2*1≤M, then in the transmitting end, after both port 7 and DATA REG1 are multiplied by the same precoding matrix C1, the multiplied signal is mapped to the antenna port transmission, port 8 and After DATA REG2 is multiplied by the same precoding matrix C2, the multiplied signal is mapped to the antenna port for transmission. The receiving end determines that the received DMRS is a precoded DMRS according to the constraint relationship K*R=2*1≤M. The receiving end uses the signal on port 7 for channel estimation, and uses the estimated channel to perform data demodulation on DATA REG1. The receiving end uses the signal on port 8 for channel estimation, and uses the estimated channel to perform data demodulation on DATA REG2.

Example 4

In this embodiment, the number of non-precoded DMRS ports is sent/determined by the PQI information in the DCI signaling:

In the LTE-A system, the PDSCH RE mapping and Quasi co-location indicator information field, that is, the PQI information, can be used to indicate the resource mapping mode of the PDSCH and the QCL parameter configuration. Table 1 shows the LTE-A system. The PQI information table.

Table 1

By adding the indication information in the PQI information table, the purpose of indicating the DMRS port type through the PQI information can be realized. Table 2 below shows the PQI information table of the newly added DMRS indication information, and the DMRS config information is added in the PQI information table, where The DMRS config information contains the type of DMRS and the corresponding number of DMRS ports. More specifically, there may be three types of DMRS config, when the value of DMRS config is 0, it is a non-precoded DMRS; when the value of DMRS config is 1, it is a precoded DMRS; when the value of DMRS config is 2 , for both pre-coded DMRS and non-precoded DMRS on the same RB. For the receiving end, the receiving end receives the DCI format 2D signaling, so as to obtain the PQI information, the type of the currently received DMRS and the number of ports N can be determined by looking up the table.

Table 2

Example 5

In this embodiment, the number of non-precoded DMRS ports is sent/determined by the feedback class:

For the sender:

Case 1. The sender sends a non-precoded DMRS, the feedback class is Class A, and the sender configures four CSI processes. The sender indicates the number of configured CSI processes by signaling, and indicates that the number of ports N of the transmitted non-precoded DMRS is bound to the third CSI process.

Case 2: The sender sends a non-precoded DMRS, the feedback class is Class B, and the sender configures one CSI process, and the CSI process includes two sets of CSI-RS resources. The sender sends the number of CSI processes by signaling, and indicates that the number N of ports of the non-precoded DMRS is bound to the first set of CSI-RS resources.

Case 3: The sender sends a non-precoded DMRS, the feedback class is Class B, and the sender configures two CSI processes, where the first CSI process contains 2 sets of CSI-RS resources, and the second CSI process contains 3 sets. CSI-RS resource. The sender indicates that the number N of ports of the non-precoded DMRS is bound by the CRI to the third set of CSI-RS resources of the second CSI process.

For the receiving end:

Case 1: The receiving end receives the non-precoded DMRS, the receiving end determines that the feedback class is Class A, and the receiving end receives the signaling to determine that there are currently 4 CSI processes and the number of non-precoded DMRS ports N is tied to the third CSI process. set. The receiving end determines the value of N through the number of ports of the CSI-RS resource of Class A in the third CSI process.

Case 2: The receiving end receives the non-precoded DMRS, the receiving end determines that the feedback class is Class B, and the receiving end receives the signaling to determine that there is currently one CSI process, and learns from the signaling that the CSI process has two sets of CSI-RS resources. The number N of non-precoded DMRS ports is bound to the first set of CSI-RS resources. The receiving end determines the value of N through the number of ports of the CSI-RS resource in the CSI-RS resource of the first CSI process.

Case 3: The receiving end receives the non-precoded DMRS, the receiving end determines that the feedback class is Class B, and the receiving end receives the signaling to determine that there are currently 2 CSI processes. The receiving end determines from the CRI indication that the non-precoded DMRS port number N is bound to the third set of CSI-RS resource on the second CSI process. The receiving end determines the value of N by the number of ports of the third set of CSI-RS resources on the second CSI process.

Example 6

In this embodiment, the transmitting end simultaneously configures Beamformed DMRS (ie, the first type of DMRS) and the Non-precoded DMRS (ie, the second type of DMRS) in the same RB, and the receiving end receives the Beamformed DMRS and the Non-precoded The DMRS and its corresponding DATA REG are estimated and demodulated.

For the sender:

The sender divides the REs in each PRB pair into K DATA REGs, G1, G2, ..., GK, each group including M1, M2, ..., MK REs, and one RE in the same PRB pair belongs to and It belongs to only one DATA REG group, and simultaneously divides M DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK. The sender divides the K DMRS port groups into two sets A and B. Set A contains n port groups, namely S1, S2, ..., Sn, and the DMRSs of the n port groups are all Beameded DMRS. Set B contains K-n port groups, respectively Sn+1, Sn+2, ..., SK, and the DMRSs of these K-n port groups are Non-precoded DMRS. At the same time, the transmitting end sends a signaling to notify the receiving end that the DMRS in the set A is a Beamformed DMRS, and the DMRS in the set B is a Non-precoded DMRS. For the jth DMRS port group Sj in set A and the DATA REG Gj (j=1, 2, . . . , n) associated therewith, the transmitting end multiplies Sj and Gj by the same precoding matrix Wj (j=1) , 2, ..., n) (corresponding to Wd above), re-mapping the multiplied signal to the antenna port transmission, wherein n precoding matrices Wj (j = 1, 2, ..., n) may be the same Can be different. For the jth DMRS port Sj in set B and the DATA REG Gj (j=1, 2,..., Kn) associated with it, the sender directly maps Sj to the antenna port transmission, but needs to preply it with Gj. The coding matrix Cj is multiplied and then mapped to the antenna port transmission, and the transmitting end transmits the precoding matrix Cj (j=1, 2, . . . , Kn) used by each DATA REG to the receiving end, where Cj is N*R. Precoding matrix, R is the number of layers of data transmission.

For the receiving end:

The receiving end divides the REs in each PRB pair into K DATA REGs, G1, G2, ..., GK, each group including M1, M2, ..., MK REs, and one RE in the same PRB pair belongs to and It belongs to only one DATA REG group, and simultaneously divides M DMRS ports P1, P2, ..., PM into K DMRS port groups S1, S2, ..., SK. The receiving end receives signaling, and determines that the DMRS in the port group S1, S2, ..., Sn is a Beamformed DMRS, and the DMRS in the port group Sn+1, Sn+2, ..., SK is a Non-precoded DMRS. For the n DMRS port groups in the set A, the receiving end can independently use the signals on the received DMRS port for channel estimation, and use the estimated channels to perform data detection for the corresponding DATA REG. For the jth DMRS port group Sj in the set B and the DATA Gj associated therewith, the receiving end needs to jointly use the received precoding matrix information Cj corresponding thereto and the signal on the received DMRS port to perform channel. It is estimated that the data of the DATA Gj is demodulated by the result of the channel estimation, where j = 1, 2, ..., Kn.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

In this embodiment, a device for transmitting a demodulation reference signal DMRS is provided, which is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

11 is a structural block diagram of a first DMRS transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 11, the apparatus includes a first determining module 112 and a first transmitting module 114, which are described below:

The first determining module 112 is configured to select a DMRS type from at least two different DMRS types. The first sending module 114 is connected to the first determining module 112, and is configured to send the selected DMRS indicated by the DMRS type.

In an optional embodiment, the at least two different DMRS types include a first type and a second type, where the first type of DMRS includes a precoded DMRS or a beamformed Beamformed DMRS; and/or The second type of DMRS includes non-precoded DMRS (ie, Non-precoded DMRS).

In an optional embodiment, when the DMRS indicated by the selected DMRS type is the DMRS of the first type, the DMRS indicated by the selected DMRS type is sent: in the mapping process from the transport layer to the DMRS port, the transmission is directly performed. The layer is mapped to the DMRS port one by one, that is, when the transport layer is mapped to the DMRS port, it is a direct mapping, and no related encoding processing is performed.

In an optional embodiment, when the DMRS indicated by the selected DMRS type is the DMRS of the first type, sending the selected DMRS indicated by the DMRS type: mapping the first type of DMRS from the DMRS port to the antenna In the process of the port, the pre-coded Wp is used to process the DMRS, where the Wp is a non-unit array, that is, the signal on the DMRS port is encoded during the mapping process from the DMRS port to the antenna port (the pre- The encoding process can be multiplied by precoding Wp). In this embodiment, before the DMRS is sent through the antenna port, the DMRS may be encoded, thereby ensuring successful transmission of the DMRS.

In an optional embodiment, the foregoing Wp is the same as the precoding Wd used by the data resource granularity group DATA REG associated with the first type of DMRS; and/or, the format of the first type of DMRS port is the same as that of the foregoing transport layer. The number of layers is equal.

In an optional embodiment, when the selected DMRS indicated by the DMRS type is the second type of DMRS, the DMRS indicated by the selected DMRS type is sent: in the mapping process from the transport layer to the DMRS port, the transport layer is multiplied After precoding Wd, it is mapped to the DMRS port.

In an optional embodiment, when the selected DMRS indicated by the DMRS type is the second type of DMRS, the DMRS indicated by the selected DMRS type is sent: the second type of DMRS is mapped from the DMRS port to the antenna port. In the process, the DMRS port is processed one by one, or in the process of mapping from the DMRS port to the antenna port, the DMRS is processed by using the precoding WI. In this embodiment, when the type of the DMRS is the second type, the DMRS can be processed by using the unit array, thereby ensuring that the DMRS is one-to-one mapped when mapped to the antenna port. In this embodiment, the value of the precoding Wd used by the data resource granularity group DATA REG associated with the Wd and the DMRS may be consistent.

In an optional embodiment, the precoding WI is different from the precoding Wd used by the data resource granularity group DATA REG associated with the second type of DMRS; and/or the number of ports of the second type of DMRS is The number of rows of Wd is equal; and/or the number of DMRS ports of the second type is equal to the number of antenna ports; and/or, the WI is an identity matrix.

In an optional embodiment, the foregoing first sending module 114 may further send the type of the DMRS by sending the type of the selected DMRS by using high layer signaling and/or physical layer signaling. In this embodiment, after the transmitting device determines the type of the DMRS, the determined type may be transmitted, so that the receiving device receiving the DMTS can perform channel estimation and data demodulation processing according to the type of the specific DMRS.

A DMRS transmitting apparatus is further provided in this embodiment. FIG. 12 is a structural block diagram of a second DMRS sending apparatus according to an embodiment of the present invention. As shown in FIG. 12, the apparatus includes a second sending module 122, Explain the device:

The second sending module 122 sends a demodulation reference signal DMRS, and the number of the DMRS ports is N.

In an optional embodiment, the foregoing second sending module 122 may indicate the number of DMRS ports by indicating the number of DMRS ports according to high layer signaling and/or physical layer signaling.

In an optional embodiment, the number of the DMRS ports may be indicated according to at least one of the following manners: indicating by a parameter of the number of DMRS ports included in the table corresponding to the PQI information; and CSI included by the CSI report type The process process is at least one of the following: when the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class A, the number of DMRS ports is a channel state information measurement guide of the CSI process. The number of ports of the frequency CSI-RS resource; when the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class B, the number of DMRS ports is more than two channel states included in the CSI process. The number of ports of the specific CSI-RS resource in the information measurement pilot CSI-RS resource, where the specific CSI-RS resource is a CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance; when the CSI report type includes When the number of CSI processes is greater than 1, the number of DMRS ports is determined according to a specified CSI process among a plurality of CSI processes included in the CSI report type.

In an optional embodiment, the number of the foregoing DMRS ports is determined according to the specified CSI process in the multiple CSI processes included in the CSI report type, including at least one of the following: when the feedback category of the specified CSI process is Class A The number of the DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the specified CSI process; when the feedback type of the specified CSI process is Class B, the number of DMRS ports is specified. The number of ports of the specific CSI-RS resource in the pilot CSI-RS resource is measured by the two or more channel state information included in the CSI process, and the specific CSI-RS resource is the CSI-RS resource index CRI corresponding to the pre-received CSI-RS resource. CSI-RS resource.

In this embodiment, a transmitting device for demodulating a reference signal DMRS is further provided. FIG. 13 is a structural block diagram of a third transmitting device for a DMRS according to an embodiment of the present invention. As shown in FIG. 13, the device includes a configuration module. 132 and the third transmitting module 134, the device will be described below.

The configuration module 132 is configured to configure at least two different types of DMRSs in one physical resource block PRB pair; the third sending module 134 is connected to the foregoing configuration module 132, and configured to send at least two different types on the PRB pair. DMRS.

In an optional embodiment, the foregoing third sending module 134 may further perform the following operations: through high layer signaling (the high layer signaling may be high layer RRC signaling, and the high layer RRC letter included in the foregoing first display signaling) The command may be the same signaling, or may be different signaling) and/or physical layer signaling (the physical layer signaling included in the first display signaling may be the same signaling, or may be different) The signaling indicates that two types of DMRSs are simultaneously configured in the PRB pair, and the values of the above M, N, K1, and K2 are obtained.

FIG. 14 is a structural block diagram of a first DMRS receiving apparatus according to an embodiment of the present invention. As shown in FIG. 14, the apparatus includes a first receiving module 142, a first processing module 144, which will be described below.

The first receiving module 142 is configured to receive the DMRS indicated by the selected DMRS type, where the selected DMRS type is a DMRS type selected from at least two different DMRS types; the first processing module 144 is connected to the first The receiving module 142 is configured to perform channel estimation by using the DMRS according to the type of the DMRS and perform data demodulation on the data resource granularity group DATA REG associated with the DMRS.

In an optional embodiment, the first processing module 146 may perform channel estimation by using the DMRS according to the type of the DMRS, and perform data demodulation on the data resource granularity group DATA REG associated with the DMRS: determining the DMRS as the first In a type of DMRS, the received DMRS is directly used for channel estimation, and the channel estimation result is used to perform data demodulation on the DMRS-associated data resource granularity group DATA REG; and/or, in determining that the DMRS is the second type. In the DMRS, the received DMRS is multiplied by the pre-coded pre-coded Wd from the transmitting device, and the result obtained by multiplication is used for channel estimation; and the data estimation result data DATA REG associated with the DMRS is used to perform data by using the channel estimation result. demodulation.

In an optional embodiment, the apparatus further includes a second determining module configured to determine the selected DMRS type by higher layer signaling and/or physical layer signaling.

In an optional embodiment, the foregoing second determining module may further determine the selected DMRS type according to at least one of the following parameters: a first type of DMRS port number, a channel rank, and a second type of DMRS port number, Data resource granularity group DATA REG number selection. The channel rank in this embodiment includes, but is not limited to, the concepts of the number of data transmission layers, the number of data transmission streams, the number of data streams, the number of data layers, the channel Rank, the RI, and the rank.

A DMRS receiving apparatus is also provided in this embodiment. FIG. 15 is a structural block diagram of a second DMRS receiving apparatus according to an embodiment of the present invention. As shown in FIG. 15, the apparatus includes a second receiving module 152, The device will be described.

The second receiving module 152 is configured to receive a demodulation reference signal DMRS, where the number of DMRS ports is N.

In an optional embodiment, the second receiving module 152 may further determine the number of DMRS ports by determining the number of the DMRS ports by using high layer signaling and/or physical layer signaling.

In an optional embodiment, the second receiving module 152 may further determine the number of DMRS ports by determining the number of the DMRS ports according to the PQI information or the channel state information reporting type CSI report type.

In an optional embodiment, the second receiving module 152 may determine the number of DMRS ports by using at least one of the following methods: configuring by using parameters of the number of DMRS ports included in the table corresponding to the PQI information; The process of the CSI process included in the report type is configured, including at least one of the following: when the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class A, the number of DMRS ports is CSI process. The channel state information is used to measure the number of ports of the pilot CSI-RS resource. When the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class B, the number of DMRS ports is two of the CSI processes. The number of ports of the specific CSI-RS resource in the pilot CSI-RS resource is measured by the channel state information, and the specific CSI-RS resource is the CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance; When the number of CSI processes included in the CSI report type is greater than 1, the number of DMRS ports is determined according to a specified CSI process in multiple CSI processes included in the CSI report type.

A DMRS receiving method is also provided in this embodiment. FIG. 16 is a flowchart of a third DMRS receiving apparatus according to an embodiment of the present invention. As shown in FIG. 16, the flow includes a third receiving module 162 and a second processing. Module 164, the device will be described below.

The third receiving module 162 is configured to receive at least two different types of DMRSs in one physical resource block PRB pair; the second processing module 164 is connected to the third receiving module 162, and configured to utilize the at least two different types of the foregoing The DMRS performs channel estimation and performs data demodulation on the data resource granularity group DATA REG associated with the at least two different types of DMRSs.

In an optional embodiment, the at least two different types of DMRSs include a first type of DMRS and a second type of DMRS, where the first type of DMRS comprises a precoded DMRS or a beamformed Beamformed DMRS; / or, the second type of DMRS includes non-precoded Non-precoded DMRS.

In an optional embodiment, the foregoing apparatus further includes a fourth receiving module configured to receive high layer signaling and/or physical layer signaling; and the high layer signaling may be high layer RRC signaling, and The high-level RRC signaling included in the foregoing first display signaling may be the same signaling, or may be different signaling) and/or physical layer signaling (with physical layer signaling included in the first display signaling described above). The following information may be determined in the same signaling or in different signaling: the type of DMRS in the PRB pair, the number M of the first type of DMRS in the PRB pair, and the number N of the second type of DMRS, The number K1 of data resource granularity groups DATA REG associated with the first type of DMRS port within the PRB pair, and the number K2 of DATA REGs associated with the second type of DMRS port within the PRB pair.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S1, selecting a type of DMRS from at least two different DMRS types;

S2: Send the selected DMRS indicated by the DMRS type.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

S1: Send a demodulation reference signal DMRS, and the number of the DMRS ports is N.

S1, configuring at least two different types of DMRSs in a physical resource block PRB pair;

S2, sending at least two different types of DMRSs on the foregoing PRB pair.

S1. Receive a DMRS indicated by the selected DMRS type, where the selected DMRS type is a DMRS type selected from at least two different DMRS types;

S2: Perform channel estimation by using the DMRS according to the type of the DMRS, and perform data demodulation on the data resource granularity group DATA REG associated with the DMRS.

S1. Receive a demodulation reference signal DMRS, where the number of DMRS ports is N.

S1, receiving at least two different types of DMRSs in a physical resource block PRB pair;

S2. Perform channel estimation by using the at least two different types of DMRSs and perform data demodulation on the data resource granularity group DATA REG associated with the at least two different types of DMRSs.

Optionally, in the embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM). A variety of media that can store program code, such as a hard disk, a disk, or an optical disk.

Optionally, in the embodiment, the processor performs the above steps according to the stored program code in the storage medium.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they can be stored in the storage device Executed by the computing device, and in some cases, the steps shown or described may be performed in an order different than that herein, or they may be fabricated into individual integrated circuit modules, or multiple of them. Or the steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, the DMRS sending method and apparatus provided by the embodiments of the present invention have the following beneficial effects: the problem that the RE occupancy is large and the resource utilization rate is low in the related art is solved, thereby reducing the RE occupancy. Improve the effect of resource utilization.

Claims

A method for transmitting a demodulation reference signal DMRS, comprising:

Selecting a DMRS type from at least two different DMRS types;

Sending the selected DMRS indicated by the DMRS type.
The method of claim 1, wherein the DMRS indicated DMRS comprises a first type of DMRS and a second type of DMRS, wherein the first type of DMRS comprises precoded DMRS or beamformed Beamformed DMRS And/or, the second type of DMRS includes a non-precoded DMRS.
The method of claim 2, wherein when the selected DMRS indicated by the DMRS type is a DMRS of the first type, the DMRS that is sent by the selected DMRS type indication includes:

During the mapping process from the transport layer to the DMRS port, the transport layer is directly mapped to the DMRS port.
The method of claim 2, wherein when the selected DMRS indicated by the DMRS type is a DMRS of the first type, the DMRS that is sent by the selected DMRS type indication includes:

In the process of mapping the first type of DMRS from the DMRS port to the antenna port, the DMRS is processed using a precoding Wp, wherein the Wp is a non-unit array.
The method of claim 4, comprising at least one of the following:

The Wp is the same as the precoding Wd used by the data resource granularity group DATA REG associated with the first type of DMRS;

The number of the first type of DMRS ports is equal to the number of layers of the transport layer.
The method of claim 2, wherein when the selected DMRS indicated by the DMRS type is a DMRS of the second type, the DMRS that sends the selected DMRS type indication includes:

In the mapping process from the transport layer to the DMRS port, the transport layer is multiplied by the precoding Wd and then mapped to the DMRS port.
The method of claim 2, wherein when the selected DMRS indicated by the DMRS type is a DMRS of the second type, the DMRS that sends the selected DMRS type indication includes:

In the process of mapping the second type of DMRS from the DMRS port to the antenna port, performing one-to-one mapping processing on the DMRS port, or using a pre-coded WI pair in the process of mapping the DMRS port to the antenna port The DMRS is processed.
The method of claim 7 wherein at least one of:

The precoding WI is different from the precoding Wd used by the data resource granularity group DATA REG associated with the second type of DMRS;

The number of the second type of DMRS ports is equal to the number of rows of the Wd;

The number of the second type of DMRS ports is equal to the number of the antenna ports;

The WI is an identity matrix.
The method of claim 1 further comprising:

The type of the selected DMRS is transmitted through higher layer signaling and/or physical layer signaling.
The method of claim 2, wherein the DMRS type is selected from at least two different DMRS types according to at least one of the following parameters,

The number of DMRS ports of the first type, the channel rank, the number of DMRS ports of the second type, and the number of data resource granularity groups DATA REG.
The method of claim 10, wherein

Selecting a first type of DMRS when the product of the channel rank and the number of DATA REGs is less than or equal to the number of DMRS ports of the second type; and/or,

When the product of the channel rank and the number of DATA REGs is greater than the number of DMRS ports of the second type, the second type of DMRS is selected.
A DMRS transmission method includes:

The demodulation reference signal DMRS is transmitted, and the number of the DMRS ports is N.
The method of claim 12, wherein the number of the DMRS ports is indicated according to the following manner:

The number of the DMRS ports is indicated according to high layer signaling and/or physical layer signaling.
The method of claim 12, wherein the number of the DMRS ports is indicated according to the following manner:

The number of the DMRS ports is indicated according to the PQI information and/or the channel state information reporting type CSI report type.
The method according to claim 14, wherein the number of the DMRS ports is indicated according to at least one of the following manners:

And indicating by using a parameter of the number of the DMRS ports included in the table corresponding to the PQI information;

Indicated by the CSI process process included in the CSI report type, including at least one of the following cases:

When the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class A, the number of the DMRS ports is a channel state information measurement pilot CSI-RS of the CSI process. The number of ports in the resource;

When the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class B, the number of the DMRS ports is two or more channel state information measurements included in the CSI process. a number of ports of a specific CSI-RS resource in the pilot CSI-RS resource, where the specific CSI-RS resource is a CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance;

When the number of CSI processes included in the CSI report type is greater than 1, the number of the DMRS ports is determined according to a specified CSI process among the multiple CSI processes included in the CSI report type.
The method according to claim 15, wherein the number of the DMRS ports is determined according to a specified CSI process of the plurality of CSI processes included in the CSI report type, including at least one of the following:

When the feedback class of the specified CSI process is Class A, the number of the DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the specified CSI process;

When the feedback class of the specified CSI process is Class B, the number of the DMRS ports is a specific CSI in the pilot CSI-RS resource of the two or more channel state information included in the specified CSI process. The number of ports of the RS resource, where the specific CSI-RS resource is a CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance.
A method for transmitting a demodulation reference signal DMRS, comprising:

Configuring at least two different types of DMRSs in a physical resource block PRB pair;

Transmitting the at least two different types of DMRSs on the PRB pair.
The method of claim 17, wherein the at least two different types of DMRS comprise a first type of DMRS and a second type of DMRS, wherein the first type of DMRS comprises precoded DMRS or beamforming Beamformed DMRS; and/or, the second type of DMRS includes a non-precoded DMRS.
The method according to claim 18, wherein the number of DMRSs of the first type configured in the PRB pair is M, the number of DMRSs of the second type is N, and K1 data resources in the PRB pair The granularity group DATA REG is associated with a first type of DMRS port, the K2 DATA REGs within the PRB pair are associated with a second type of DMRS port, and precoding Wd for the K2 DATA REGs is transmitted.
The method of claim 19, wherein the method further comprises:

The two types of DMRSs are simultaneously configured in the PRB pair by high layer signaling and/or physical layer signaling, and the values of the M, N, K1, K2 are transmitted.
A method for demodulating reference signal DMRS reception, comprising:

Receiving a DMRS indicated by the selected DMRS type, wherein the selected DMRS type is a DMRS type selected from at least two different DMRS types;

Performing channel estimation using the DMRS according to the type of the DMRS and performing data demodulation on the data resource granularity group DATA REG associated with the DMRS.
The method of claim 21, wherein the at least two different DMRS type DMRSs comprise a first type of DMRS and a second type of DMRS, wherein the first type of DMRS comprises a precoded DMRS or Beamforming Beamformed DMRS; and/or, the second type of DMRS comprises a non-precoded DMRS.
The method of claim 22, wherein the channel is utilized by the DMRS according to a type of the DMRS Estimating and demodulating the data resource granularity group DATA REG associated with the DMRS includes:

When determining that the DMRS is the first type of DMRS, performing channel estimation directly by using the received DMRS, and performing data demodulation on the data resource granularity group DATA REG associated with the DMRS by using a channel estimation result; and/or ,

When determining that the DMRS is a second type of DMRS, multiplying the received DMRS by a pre-received precoding Wd, and performing channel estimation by using the result obtained by multiplying; using the channel estimation result to the DMRS The associated data resource granularity group DATA REG performs data demodulation.
The method of claim 21, further comprising:

The selected DMRS type is determined by higher layer signaling and/or physical layer signaling.
The method of claim 22, wherein the selected DMRS type is determined according to at least one of the following parameters:

The number of DMRS ports of the first type, the channel rank, the number of DMRS ports of the second type, and the number of data resource granularity groups DATA REG.
The method of claim 25, wherein

When the product of the channel rank and the number of DATA REGs is less than or equal to the number of DMRS ports of the second type, determining that the selected DMRS type is the first type; and/or,

When the product of the channel rank and the number of DATA REGs is greater than the number of DMRS ports of the second type, it is determined that the selected DMRS type is the second type.
A DMRS receiving method includes:

The demodulation reference signal DMRS is received, and the number of the DMRS ports is N.
The method of claim 27, wherein the number of the DMRS ports is determined according to the following manner:

The number of the DMRS ports is determined by high layer signaling and/or physical layer signaling.
The method of claim 27, wherein the number of the DMRS ports is determined according to the following manner:

The number of the DMRS ports is determined according to the PQI information and/or the channel state information report type CSI report type.
The method of claim 29, wherein the number of the DMRS ports is determined according to at least one of the following manners:

Determining, by the parameter of the number of the DMRS ports included in the table corresponding to the PQI information, the number of the DMRS ports;

Determining, by the CSI process process included in the CSI report type, the number of the DMRS ports, including at least one of the following cases:

When the number of CSI processes included in the CSI report type is 1, and the feedback category of the CSI process In the case of Class A, the number of the DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the CSI process;

When the number of CSI processes included in the CSI report type is 1, and the feedback class of the CSI process is Class B, the number of the DMRS ports is two or more channel state information measurements included in the CSI process. a number of ports of a specific CSI-RS resource in the pilot CSI-RS resource, where the specific CSI-RS resource is a CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance;

When the number of CSI processes included in the CSI report type is greater than 1, the number of the DMRS ports is determined according to a specified CSI process among the multiple CSI processes included in the CSI report type.
The method according to claim 30, wherein the number of the DMRS ports is determined according to a specified CSI process of the plurality of CSI processes included in the CSI report type, including at least one of the following:

When the feedback class of the specified CSI process is Class A, the number of the DMRS ports is the number of ports of the channel state information measurement pilot CSI-RS resource of the specified CSI process;

When the feedback class of the specified CSI process is Class B, the number of the DMRS ports is a specific CSI in the pilot CSI-RS resource of the two or more channel state information included in the specified CSI process. The number of ports of the RS resource, where the specific CSI-RS resource is a CSI-RS resource corresponding to the CSI-RS resource index CRI received in advance.
A DMRS receiving method includes:

Receiving at least two different types of DMRSs within one physical resource block PRB pair;

Channel estimation using the at least two different types of DMRSs and data demodulation of the data resource granularity group DATA REG associated with the at least two different types of DMRSs.
The method of claim 32, wherein the at least two different types of DMRSs comprise a first type of DMRS and a second type of DMRS, wherein the first type of DMRS comprises precoded DMRS or beamforming Beamformed DMRS; and/or, the second type of DMRS includes a non-precoded DMRS.
The method of claim 33, wherein the method further comprises:

Receiving high layer signaling and/or physical layer signaling;

Determining, from the high layer signaling and/or physical layer signaling, the type of the DMRS in the PRB pair, the number M of the first type of DMRS in the PRB pair, and the number of the second type of DMRS N, the number K1 of data resource granularity groups DATA REG associated with the first type of DMRS port in the PRB pair, and the number K2 of DATA REGs associated with the second type of DMRS port in the PRB pair, and receiving Precode Wd.
A transmitting device for demodulating a reference signal DMRS, comprising:

a first determining module, configured to select a DMRS type from at least two different DMRS types;

The first sending module is configured to send the selected DMRS indicated by the DMRS type.
A storage medium, the storage medium comprising a stored program, wherein the program is executed to perform the method of any one of claims 1 to 34.
A processor for running a program, wherein the program is executed to perform the method of any one of claims 1 to 34.