CN112584508B

CN112584508B - Method, device, base station and terminal for indicating allocation of demodulation reference signal ports

Info

Publication number: CN112584508B
Application number: CN201910941824.1A
Authority: CN
Inventors: 苏昕; 高雪媛; 高秋彬
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2023-05-30
Anticipated expiration: 2039-09-30
Also published as: WO2021063042A1; CN112584508A

Abstract

The embodiment of the invention discloses a method, a device, a base station and a terminal for indicating allocation of demodulation reference signal ports, wherein the method comprises the following steps: sending an indication signaling to a terminal UE so that the UE determines the allocation situation of a demodulation reference signal (DMRS) port according to the indication information; wherein, the indication signaling carries indication information of a DMRS allocation table configured at a high layer; or, the indication signaling carries indication information of a transmission mode configured by a higher layer, indication information of a demodulation reference signal (DMRS) type and indication information of a maximum preamble DMRS symbol number. According to the embodiment of the invention, the indication information is carried in the signaling, so that the DMRS allocation table is directly indicated or the appointed DMRS allocation table is indicated through the parameters, and the cost of the DMRS port indication can be effectively reduced.

Description

Method, device, base station and terminal for indicating allocation of demodulation reference signal ports

Technical Field

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

Background

There are several typical application scenarios for the requirement of URLLC (Ultra Reliable Low Latency Communications, ultra-high reliability low latency communication) service at present, including the entertainment industry of AR (Augmented Reality )/VR (Virtual Reality), industrial automation, traffic control requirements including remote driving, and power distribution control requirements. These URLLC services have higher requirements in terms of reliability, latency, performance, etc.

In the existing URLLC enhanced scheme based on multi-point cooperation, a special designed independent DMRS port allocation and indication scheme is not available.

Disclosure of Invention

Because the existing method has the problems, the embodiment of the invention provides an allocation indication method, an allocation indication device, a base station and a terminal of a demodulation reference signal port.

In a first aspect, an embodiment of the present invention provides a method for indicating allocation of demodulation reference signal ports, including:

sending an indication signaling to a terminal UE so that the UE determines the allocation situation of a demodulation reference signal (DMRS) port according to the indication information;

wherein, the indication signaling carries indication information of a DMRS allocation table configured at a high layer; or alternatively, the first and second heat exchangers may be,

the indication signaling carries indication information of a transmission mode configured by a high layer, indication information of a demodulation reference signal (DMRS) type and indication information of a maximum preamble DMRS symbol number.

In a second aspect, an embodiment of the present invention further provides a method for indicating allocation of demodulation reference signal ports, including:

receiving indication signaling sent by a base station, and determining the allocation situation of a demodulation reference signal (DMRS) port according to the indication information;

In a third aspect, an embodiment of the present invention provides an allocation indication device for a demodulation reference signal port, including:

the signaling sending module is used for sending indication signaling to the terminal UE so that the UE can determine the allocation situation of the demodulation reference signal (DMRS) port according to the indication information;

In a fourth aspect, an embodiment of the present invention further provides an allocation indication device of a demodulation reference signal port, including:

the signaling receiving module is used for receiving the indication signaling sent by the base station and determining the allocation situation of the demodulation reference signal (DMRS) port according to the indication information;

In a fifth aspect, an embodiment of the present invention further proposes a base station, including:

at least one processor; and

at least one memory communicatively coupled to the processor, wherein:

the memory stores program instructions executable by the processor, the processor invoking the program instructions capable of performing the method of:

In a sixth aspect, an embodiment of the present invention further provides a terminal, including:

at least one processor; and

at least one memory communicatively coupled to the processor, wherein:

In a seventh aspect, embodiments of the present invention also propose a non-transitory computer-readable storage medium storing a computer program, the computer program causing the computer to carry out the method of:

In an eighth aspect, embodiments of the present invention also propose a non-transitory computer-readable storage medium storing a computer program, the computer program causing the computer to carry out the method of:

As can be seen from the above technical solutions, in the embodiments of the present invention, by carrying indication information in signaling, the DMRS allocation table is directly indicated or the DMRS allocation table already agreed is indicated by a parameter, so that the overhead indicated by the DMRS port can be effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1 (a) and (B) are schematic diagrams of 1 symbol and 2 symbols, respectively, in DMRS pilot type 1 provided in the prior art;

fig. 2 (a) and (B) are schematic diagrams of 1 symbol and 2 symbols, respectively, in DMRS pilot type 2 provided in the prior art;

fig. 3 is a flowchart illustrating a method for indicating allocation of demodulation reference signal ports at a base station side according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating a method for indicating allocation of a demodulation reference signal port at a terminal side according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an allocation indication device of a demodulation reference signal port at a base station side according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an allocation indication device of a demodulation reference signal port at a terminal side according to an embodiment of the present invention;

FIG. 7 is a logic block diagram of a base station according to an embodiment of the present invention;

fig. 8 is a logic block diagram of a base station according to an embodiment of the present invention.

Detailed Description

The following describes the embodiments of the present invention further with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.

Specifically, the coordinated multi-point transmission technology based on multiple TRP/PANEL mainly comprises the following two types:

1) Multi-TRP/panel transmission technique

In order to improve coverage at the cell edge, providing a more balanced quality of service within the service area, coordinated multipoint remains an important technical approach in NR systems. From the network morphology perspective, network deployment in a manner of centralized processing of a large number of distributed access points and base bands is more beneficial to providing balanced user experience rates, and significantly reduces time delay and signaling overhead caused by handover. With the rise of frequency bands, relatively dense access point deployment is also required from the viewpoint of ensuring network coverage. In the high frequency band, as the integration level of the active antenna device increases, the modularized active antenna array is more preferred. The antenna array of each TRP can be divided into a plurality of relatively independent antenna panels, so that the form and the port number of the whole array surface can be flexibly adjusted according to deployment scenes and service requirements. And the antenna panels or TRPs can be connected by optical fibers, so that more flexible distributed deployment can be performed. In the millimeter wave band, the blocking effect generated by obstacles such as human bodies or vehicles is more remarkable along with the reduction of the wavelength. In this case, from the viewpoint of ensuring link connection robustness, transmission/reception may be performed from a plurality of beams at a plurality of angles by using cooperation between a plurality of TRPs or panels, thereby reducing adverse effects caused by blocking effects.

The coordinated multi-point transmission technique can be classified into two kinds of coherent and incoherent transmission according to the mapping relation of the transmission signal stream to the plurality of TRP/panels. Wherein each data layer is mapped onto a plurality of TRPs/panels by a weight vector during coherent transmission. Whereas in non-coherent transmission, each data stream is mapped onto only part of the TRP/panel. Coherent transmission has higher requirements for synchronization between transmission points and transmission capability of backhaul links, and is thus sensitive to many non-ideal factors in realistic deployment conditions. In contrast, incoherent transmission is less affected by the above factors and is therefore an important consideration for multipoint transmission techniques.

NC-JT transmission may be performed by a single PDCCH (Physical Downlink Control Channel ) for scheduling a single PDSC (Physical Downlink Shared Channel, physical downlink shared channel) (single-PDCCH), or by a plurality of PDCCHs, each of which schedules a corresponding PDSCH (multi-PDCCH). In addition to the eMBB service, the coordinated multi-point technology has important significance for improving the reliability of the URLLC service transmission. For example, in the high frequency band, blocking effects may cause temporary interruption of communication. In this case, the probability that the signal is blocked can be reduced by cooperative transmission of a plurality of transmission points/panels. In addition, the reliability of transmission can be improved by repeated or diversity transmission of a plurality of transmission points/panels.

2) DMRS (Demodulation Reference Signa, demodulation reference signal) design scheme

DMRS ports are multiplexed with FDM (Frequency Division Multiplexing ) +cdm (Code Division Multiplexing, code division multiplexing). Each CDM group is divided into a plurality of ports by orthogonal code division multiplexing (Orthogonal Cover Code, OCC), and CDM groups are separated by FDM. The NR supports two pilot types, and the pilot type used is configured by higher layer signaling. The multiplexing and configuration modes of the two pilot types are specifically described as follows:

DMRS pilot type 1, as shown in fig. 1:

in the single OFDM symbol, at most 4 ports are supported by two groups of comb resources of frequency division, as shown in fig. 1 (a), wherein 2-port multiplexing is supported by an OCC mode in each group of comb resources;

at most 8 ports are supported for double OFDM symbols, as shown in fig. 1 (B), where the number of supportable ports per OFDM is 4.

DM-RS pilot type 2, as shown in fig. 2:

when a single OFDM symbol is adopted, sub-carriers of one OFDM are divided into three groups, each group consists of two adjacent sub-carriers, and 6 ports are supported at most by FDM multiplexing among groups, as shown in fig. 2 (A), wherein 2-port multiplexing is supported in each group of resources in an OCC mode;

with double OFDM symbols, up to 4 orthogonal ports are supported within each CDM group, as shown in fig. 2 (B), so up to 12 ports are supported in 3 CDM groups.

The port allocation method of DMRS is defined in TS38.212 as follows:

TABLE 1 antenna port(s) (1000+DMRS port), dmrs-type=1, maxLength=1

TABLE 2 antenna port(s) (1000+DMRS port), dmrs-type=1, maxLength=2

TABLE 3 antenna port(s) (1000+DMRS port), dmrs-type=2, maxLength=1

TABLE 4 antenna port(s) (1000+DMRS port), dmrs-type=2, maxLength=2

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3) URLLC enhancement scheme based on coordinated multi-point transmission

The currently possible URLLC enhancement schemes based on coordinated multipoint transmission include the following:

scheme 1 (SDM, spatial Division Multiplexing, space division multiplexing): on overlapping time-frequency resources within one slot, each transmission opportunity (transmission occasion, actually refers to a signal sent by one TRP on one resource) corresponds to one TCI state and one set of data layers of one DMRS port;

scheme 2 (FDM): in one slot, each frequency domain resource is associated to one TCI state, and the frequency domain resources are not overlapped with each other;

scheme 3 (mini-slot level TDM (Time Division Multiplexing, time division multiplexing)): in one slot, each time domain resource is associated with one TCI state, and the time domain resources are not overlapped with each other. Wherein, one time domain resource refers to a group (only one time domain resource can be in each group);

scheme 4 (slot level TDM): each time domain resource is associated with a TCI state, and the time domain resources are not overlapped. Where a set of time domain resources refers to a set (there may be only one in each set) of slots.

Combinations of the above may be further performed, such as fdm+tdm.

If the URLLC service uses the DMRS port allocation and indication scheme of the existing eMBB (Enhanced Mobile Broadband ) service design, as shown in tables 1-4, there is a lot of redundant information, and the signaling overhead of the downlink control channel cannot be reduced, so the present invention proposes the following DMRS port allocation tables 5-12:

TABLE 5 antenna port(s) (1000+DMRS port), dmrs-type=1, maxLength=1

TABLE 6 antenna port(s) (1000+DMRS port), dmrs-type=1, maxLength=2

TABLE 7 antenna port(s) (1000+DMRS port), dmrs-type=2, maxLength=1

TABLE 8 antenna port(s) (1000+DMRS port), dmrs-type=2, maxLength=2

TABLE 9 antenna port(s) (1000+DMRS port), dmrs-type=1, maxLength=1

TABLE 10 antenna port(s) (1000+DMRS port), dmrs-type=1, maxLength=2

TABLE 11 antenna port(s) (1000+DMRS port), dmrs-type=2, maxLength=1

TABLE 12 antenna port(s) (1000+DMRS port), dmrs-type=2, maxLength=2

Fig. 3 shows a flow chart of an allocation indication method of a demodulation reference signal port at a base station side according to the present embodiment, including:

and S301, sending an indication signaling to the terminal UE so that the UE determines the allocation situation of the demodulation reference signal (DMRS) port according to the indication information.

In this embodiment, the indication information is carried in the signaling to directly indicate the DMRS allocation table or indicate the DMRS allocation table already appointed by the parameter, so that the overhead of DMRS port indication can be effectively reduced.

Further, on the basis of the above method embodiment, when ultra-high reliability ultra-low delay communication URLLC service transmission is performed or low overhead control signaling is used, the DMRS allocation table only includes allocation situations of DMRS ports of a single user and a single codeword.

When performing enhanced mobile broadband eMBB service, URLLC service transmission or using high overhead control signaling, the DMRS allocation table includes allocation of DMRS ports for single and multiple users and/or single and double codewords.

Specifically, if the URLLC service uses the DMRS port allocation and indication scheme of the existing eMBB (Enhanced Mobile Broadband ) service design, there is a lot of redundant information, and the signaling overhead of the downlink control channel cannot be reduced, so the present implementation proposes the following scheme:

and when the transmission scheme is determined to be eMBB service according to the configuration/indication of the high-layer signaling, the allocation and indication of the DMRS ports are carried out according to the original DMRS allocation table (tables 1-4).

According to the configuration/indication of the higher layer signaling, when the transmission scheme is determined to be FDM or TDM, the DMRS ports are allocated and indicated according to the DMRS allocation table (table 5-8) provided in this embodiment.

And when the transmission scheme is SDM according to the configuration/indication of the high-layer signaling, the DMRS ports are allocated and indicated according to the DMRS allocation table (tables 9-12) provided by the embodiment.

Alternatively, the higher layer signaling may directly configure/indicate the DMRS ports using the original DMRS allocation table (tables 1-4), or the DMRS allocation table provided in this embodiment (tables 5-8 or tables 9-12).

Further, on the basis of the above method embodiment, 2 DMRS ports are allocated in the DMRS allocation table at most, single codeword transmission is supported at most, and multi-user-multiple input multiple output MU-MIMO is not supported;

when the transmission mode is Frequency Division Multiplexing (FDM) or Time Division Multiplexing (TDM), all the DMRS ports in the DMRS allocation table belong to 1 Code Division Multiplexing (CDM) group;

when the transmission mode is space division multiplexing SDM, all DMRS ports in the DMRS allocation table belong to 1 or 2 CDM groups.

Specifically, in the DMRS allocation table designed for FDM and TDM:

all DMRS ports belong to 1 CDM group, e.g., CDM group 0;

only the transmission of the maximum rank2 is supported, namely 2 DMRS ports are allocated at most;

only single codeword transmission is supported at maximum;

the number of CDM groups without data may be 1, 2 or 3 for different DMRS estimation reliability requirements (the specific maximum number depends on the parameter configuration of the DMRS, so the number of tables per table may be different);

MU-MIMO is not supported and a user may assume that a user with which it is not co-scheduled uses the same time-frequency resources as it does.

For example, using table 5, DMRS port allocation requires a 2bit indication; when table 6 is used, DMRS port allocation requires a 3bit indication; when table 7 is used, DMRS port allocation requires a 3bit indication; using table 8, DMRS port allocation requires a 4bit indication. There is a significant overhead savings over tables 1-4.

On the other hand, in the DMRS allocation table designed for SDM:

all DMRS ports belong to 1 or 2 CDM groups, e.g., CDM group 0 or CDM groups 0 and 1;

only single codeword transmission is supported at maximum;

For example, using table 9, DMRS port allocation requires a 3bit indication; when table 10 is used, DMRS port allocation requires a 3bit indication; when table 11 is used, DMRS port allocation requires a 3bit indication; using table 12, DMRS port allocation requires a 4bit indication. There is a significant overhead savings over tables 1-4.

Further, on the basis of the above method embodiment, the indication signaling further carries indication information of the CDM group number without data in the corresponding DMRS allocation table, indication information of the DMRS port set, and indication information of the actually used preamble DMRS symbol number.

Specifically, if the DMRS allocation table is determined to be used, a specific table to be used is determined according to the type of DMRS and the configuration of the maximum preamble DMRS symbol number.

After determining the specific table, the base station indicates "CDM group number without data", "DMRS port set", "actually used preamble DMRS symbol number" by the Value in the table. And the terminal determines corresponding parameters according to the indicated value and receives the parameters.

According to the configuration of the network side, when the URLLC service transmission adopts the FDM/TDM/SDM scheme, a low-cost DMRS port allocation indication mode, a low-cost DMRS port allocation table (tables 5-12) and design principles thereof are used, and when the TDM and FDM URLLC transmission is carried out, the functions of double code words, multiple users and the like which are not needed for the URLLC transmission are removed from the new DMRS indication table, so that the cost of the DMRS port indication can be effectively reduced.

Fig. 4 is a flow chart illustrating a method for indicating allocation of demodulation reference signal ports on a terminal side according to the present embodiment, where the method includes:

s401, receiving indication signaling sent by a base station, and determining the allocation situation of a demodulation reference signal (DMRS) port according to the indication information.

Further, on the basis of the above method embodiment, when performing enhanced mobile broadband eMBB service, URLLC service transmission or using high overhead control signaling, the DMRS allocation table includes allocation situations of DMRS ports of single users and multiple users, and/or single codeword and double codeword.

The method for indicating allocation of the demodulation reference signal ports on the terminal side in this embodiment is similar to the method for indicating allocation of the demodulation reference signal ports on the base station side in principle and technical effects, and will not be described here again.

Fig. 5 shows a schematic structural diagram of an allocation indication device of a demodulation reference signal port at a base station side according to the present embodiment, where the device includes: signaling module 501, wherein:

the signaling sending module 501 is configured to send an indication signaling to a terminal UE, so that the UE determines an allocation situation of a DMRS port of a demodulation reference signal according to the indication information.

The allocation indication device of the demodulation reference signal port in this embodiment may be used to execute the corresponding method embodiment, and the principle and technical effects are similar, and are not repeated here.

Fig. 6 shows a schematic structural diagram of an allocation indication device of a demodulation reference signal port at a terminal side according to the present embodiment, where the device includes: a signaling receiving module 601, wherein:

the signaling receiving module 601 is configured to receive an indication signaling sent by a base station, and determine an allocation situation of a demodulation reference signal DMRS port according to the indication information;

Referring to fig. 7, the base station includes: a processor (processor) 701, a memory (memory) 702, and a bus 703;

wherein, the liquid crystal display device comprises a liquid crystal display device,

the processor 701 and the memory 702 perform communication with each other through the bus 703;

the processor 701 is configured to call program instructions in the memory 702 to perform the following method:

Further, on the basis of the above embodiment, when ultra-high reliability ultra-low latency communication URLLC service transmission is performed or low overhead control signaling is used, the DMRS allocation table includes only the allocation situation of DMRS ports of a single user and a single codeword.

Further, on the basis of the above embodiment, when performing enhanced mobile broadband eMBB service, URLLC service transmission or using high overhead control signaling, the DMRS allocation table includes allocation situations of DMRS ports of single users and multiple users, and/or single codeword and double codeword.

Further, on the basis of the above embodiment, 2 DMRS ports are allocated in the DMRS allocation table at most, single codeword transmission is supported at most, and multi-user-multiple input multiple output MU-MIMO is not supported;

Further, on the basis of the foregoing embodiment, the indication signaling further carries indication information of the CDM group number without data in the corresponding DMRS allocation table, indication information of the DMRS port set, and indication information of the actually used preamble DMRS symbol number.

The base station in this embodiment may be used to execute the corresponding method embodiment, and its principle and technical effects are similar, and are not described herein again.

Referring to fig. 8, the terminal includes: a processor (processor) 801, a memory (memory) 802, and a bus 803;

the processor 801 and memory 802 communicate with each other via the bus 803;

the processor 801 is configured to call program instructions in the memory 802 to perform the following method:

The terminal in this embodiment may be used to execute the corresponding method embodiment, and the principle and technical effects of the terminal are similar, and are not repeated herein.

The present embodiments disclose a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the method of:

transmitting an indication signaling to a terminal UE;

receiving an indication signaling sent by a base station;

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.

It should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An allocation indication method of a demodulation reference signal port, comprising:

sending an indication signaling to a terminal UE, wherein indication information carried by the indication signaling is used for determining the allocation situation of a demodulation reference signal (DMRS) port by the UE;

the indication signaling carries indication information of a transmission mode configured by a high layer, indication information of a demodulation reference signal (DMRS) type and indication information of the maximum prepositive DMRS symbol number;

when ultra-high reliability ultra-low delay communication URLLC service transmission is carried out or low overhead control signaling is used, the DMRS allocation table only comprises allocation conditions of single user and single code word DMRS ports, 2 DMRS ports are allocated in the DMRS allocation table at most, single code word transmission is supported at most, and multi-user-multi-input multi-output MU-MIMO is not supported;

when ultra-high reliability ultra-low time delay communication URLLC service transmission is carried out or low overhead control signaling is used, and the transmission mode is frequency division multiplexing FDM or time division multiplexing TDM, all the DMRS ports in the DMRS allocation table belong to 1 code division multiplexing CDM group;

when ultra-high reliability ultra-low time delay communication URLLC service transmission or low overhead control signaling is carried out and a transmission mode is space division multiplexing SDM, all DMRS ports in the DMRS allocation table belong to 1 or 2 CDM groups; or (b)

2. The method of allocating and indicating demodulation reference signal ports according to claim 1, wherein the indication signaling further carries indication information of CDM groups without data in the corresponding DMRS allocation table, indication information of DMRS port sets, and indication information of the number of pre-DMRS symbols actually used.

3. An allocation indication method of a demodulation reference signal port, comprising:

receiving an indication signaling sent by a base station, and determining the allocation situation of a demodulation reference signal (DMRS) port according to indication information carried by the indication signaling;

4. The method of allocating and indicating demodulation reference signal ports according to claim 3, wherein the indication signaling further carries indication information of CDM groups without data in the corresponding DMRS allocation table, indication information of DMRS port sets, and indication information of the number of pre-DMRS symbols actually used.

5. An allocation indication device of a demodulation reference signal port, comprising:

the signaling sending module is used for sending indication signaling to the terminal UE, wherein indication information carried by the indication signaling is used for determining the allocation situation of the demodulation reference signal (DMRS) port by the UE;

6. An allocation indication device of a demodulation reference signal port, comprising:

the signaling receiving module is used for receiving the indication signaling sent by the base station and determining the allocation situation of the demodulation reference signal (DMRS) port according to the indication information carried by the indication signaling;

7. A base station comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps of:

8. The base station of claim 7 wherein the indication signaling further carries indication information of CDM groups without data in the corresponding DMRS allocation table, indication information of DMRS port sets, and indication information of the number of pre-DMRS symbols actually used.

9. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps of:

10. The terminal of claim 9, wherein the indication signaling further carries indication information of a CDM group number without data in the corresponding DMRS allocation table, indication information of a DMRS port set, and indication information of a pre-DMRS symbol number actually used.

11. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the demodulation reference signal port allocation indication method according to claim 1 or 2.

12. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the demodulation reference signal port allocation indication method according to claim 3 or 4.