CN114362903A

CN114362903A - Sending method and receiving method of demodulation reference signal, base station and user equipment

Info

Publication number: CN114362903A
Application number: CN202111514397.2A
Authority: CN
Inventors: 王三新
Original assignee: Shenzhen Transsion Holdings Co Ltd
Current assignee: Shenzhen Transsion Holdings Co Ltd
Priority date: 2017-11-20
Filing date: 2017-11-20
Publication date: 2022-04-15
Anticipated expiration: 2037-11-20
Also published as: CN114362903B; CN109818722B; CN109818722A

Abstract

The embodiment of the invention discloses a method for sending and receiving a demodulation reference signal, a base station and user equipment, wherein the sending method comprises the following steps: determining the configuration type of a demodulation reference signal (DMRS) corresponding to a micro-slot according to the number of symbols occupied by the micro-slot; the configuration parameters corresponding to the configuration type comprise at least one of the following items: comb teeth, cyclic shift of DMRS and symbols occupied by the DMRS, wherein the number of at least one configuration parameter in different configuration types is different; determining at least one user equipment scheduled in the micro time slot and a value of the configuration parameter corresponding to the at least one user equipment according to the configuration type; and sending the configuration type and the value of the configuration parameter to the at least one user equipment. In the embodiment of the invention, the configuration type of the corresponding DMRS is determined according to the number of symbols occupied by the minislots, so that the real-time performance of channel estimation through the DMRS is ensured, and the channel estimation performance is ensured.

Description

Sending method and receiving method of demodulation reference signal, base station and user equipment

The application is a divisional application of Chinese patent application with the application number of 201711161361.4, the application date of 2017, 11 and 20, and the name of 'sending method and receiving method of demodulation reference signals, base station and user equipment'.

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a sending method and a receiving method for demodulation reference signals, a base station, and a user equipment.

Background

In a Long Term Evolution (LTE) system, a downlink pilot includes a Cell Reference Signal (CRS), a Demodulation Reference Signal (DMRS) for user Demodulation, and a Channel State Reference Signal (CSI-RS) for Channel State information measurement. In order to reduce unnecessary pilot overhead, in a fifth Generation (5th-Generation, 5G) mobile communication system, CRSs are deleted and DMRSs and CSI-RSs are enhanced. For example, a user-level DMRS is set for both a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH), so as to improve the beamforming reception performance, and the CSI-RS is used for beam measurement, and changes in these functions correspondingly bring about changes in pilot design.

For example, based on the scheduling policy of the time slot, the pilot is set at the starting position of each downlink time slot of the PDCCH and the PDSCH, that is, a front-loaded DMRS is set for each downlink time slot, which allows the receiving end to start channel estimation after receiving a partial symbol. Meanwhile, in order to take the performance of channel estimation into account, when a downlink symbol in a downlink time slot exceeds a certain threshold value, a dynamic demodulation reference signal (Additional DMRS) is added, so that the terminal is allowed to adopt interpolation or other algorithms based on the pre-demodulation reference signal and the dynamic demodulation reference signal, and the channel estimation quality is ensured.

However, in a 5G communication system, in order to reduce the data latency of a transmitting end, micro-slot (mini-slot) scheduling is usually adopted, and mini-slot scheduling is a non-slot-based scheduling method, and no solution is provided for pilot based on mini-slot scheduling at present, and the channel estimation performance cannot be guaranteed.

Disclosure of Invention

In view of this, embodiments of the present invention provide a sending method and a receiving method for demodulation reference signals, a base station, and a user equipment, which can solve the technical problem that channel estimation performance cannot be guaranteed when scheduling is based on a micro slot.

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

determining the configuration type of a demodulation reference signal (DMRS) corresponding to a micro-slot according to the number of symbols occupied by the micro-slot; the configuration parameters corresponding to the configuration type comprise at least one of the following items: comb teeth, cyclic shift of DMRS and symbols occupied by the DMRS, wherein the number of at least one configuration parameter in different configuration types is different;

determining at least one user equipment scheduled in the micro time slot and a value of the configuration parameter corresponding to the at least one user equipment according to the configuration type;

and sending the configuration type and the value of the configuration parameter to the at least one user equipment.

In a second aspect, an embodiment of the present invention provides a method for receiving a demodulation reference signal, where the method is applied to a receiving end, and includes:

receiving a configuration type of a demodulation reference signal (DMRS) sent by a base station; the configuration type is determined according to the number of symbols occupied by the scheduled micro time slot, and the configuration parameters corresponding to the configuration type comprise at least one of the following items: comb teeth, cyclic shift of DMRS and symbols occupied by the DMRS, wherein the number of at least one configuration parameter in different configuration types is different;

receiving the value of the configuration parameter of the DMRS sent by a base station;

determining the sequence of the DMRS and a subcarrier to be mapped according to the configuration type of the DMRS and the value of the configuration parameter;

mapping or demodulating the sequence of the DMRS to or at the determined subcarrier.

In a third aspect, an embodiment of the present invention provides a base station, including means for performing the method in the first aspect.

In a fourth aspect, an embodiment of the present invention provides a user equipment, which includes a unit configured to perform the method according to the second aspect.

In a fifth aspect, an embodiment of the present invention provides a base station, including a processor, an input device, an output device, and a memory, where the processor, the input device, the output device, and the memory are connected to each other, where the memory is used to store a computer program, and the computer program includes program instructions, and the processor is configured to call the program instructions to execute the method according to the first aspect.

In a sixth aspect, an embodiment of the present invention provides a user equipment, including a processor, an input device, an output device, and a memory, where the processor, the input device, the output device, and the memory are connected to each other, where the memory is used to store a computer program, and the computer program includes program instructions, and the processor is configured to call the program instructions to execute the method according to the second aspect.

In a seventh aspect, the present invention provides a computer-readable storage medium, in which a computer program is stored, the computer program including program instructions, which, when executed by a processor, cause the processor to execute the method according to the first aspect.

In an eighth aspect, the present invention provides a computer-readable storage medium, wherein the computer storage medium stores a computer program, and the computer program comprises program instructions, which when executed by a processor, cause the processor to execute the method according to the second aspect.

In the embodiment of the invention, different DMRS configuration types are set, and the corresponding DMRS configuration type is determined according to the number of symbols occupied by the minislots, so that the real-time performance of channel estimation through the DMRS is ensured, and the channel estimation performance is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a flowchart of an implementation of a method for transmitting a demodulation reference signal according to an embodiment of the present invention;

FIG. 2 is a diagram of an example of data scheduling based on a self-contained frame structure according to an embodiment of the present invention;

fig. 3 is a DMRS diagram of a 2-symbol-length minislot provided in an embodiment of the present invention;

fig. 4 is a DMRS diagram of a 4-symbol-length minislot provided in an embodiment of the present invention;

FIG. 5 is a diagram of an example of data scheduling based on a self-contained frame structure according to another embodiment of the present invention;

fig. 6 is a flowchart of an implementation of a method for transmitting a demodulation reference signal according to another embodiment of the present invention;

fig. 7 is a flowchart of an implementation of a method for receiving a demodulation reference signal according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of data scheduling based on a self-contained frame structure according to still another embodiment of the present invention;

fig. 9 is a flowchart of an implementation of a method for receiving a demodulation reference signal according to another embodiment of the present invention;

fig. 10 is a schematic block diagram of a base station according to an embodiment of the present invention;

fig. 11 is a schematic block diagram of a user equipment provided in an embodiment of the present invention;

fig. 12 is a schematic block diagram of a base station according to another embodiment of the present invention;

fig. 13 is a schematic block diagram of a user equipment according to still another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".

Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a method for sending a demodulation reference signal according to an embodiment of the present invention, where in the embodiment corresponding to fig. 1, an execution subject of the flow is a network side device. The network side device is configured to schedule communication resources (also referred to as "channels", "time-frequency resources", and the like), for example, when the communication system is a communication system based on the LTE technology, the network side device may be a base station (eNodeB, eNB); when the communication system is a 5G-based communication system, the network side device may be a base station (gNB) adapted to a New Radio, NR; in communication systems based on other technologies, other names may exist for the network side device, which is not illustrated here. The following describes an embodiment of the present invention by taking a network side device as a base station as an example.

S101: determining the configuration type of a demodulation reference signal (DMRS) corresponding to a micro-slot according to the number of symbols occupied by the micro-slot; the configuration parameters corresponding to the configuration type comprise at least one of the following items: comb teeth (Comb), Cyclic Shift (CS) of DMRS, and symbols occupied by DMRS, where the number of at least one of the configuration parameters is different in different configuration types.

The method comprises the steps that a preset corresponding relation between the symbol number of a micro-slot and the configuration type of a demodulation reference signal DMRS is stored in a base station in advance, and the base station determines the configuration type of the demodulation reference signal DMRS corresponding to the micro-slot according to the preset corresponding relation between the symbol number of the micro-slot and the configuration type of the DMRS and the symbol number occupied by the currently scheduled micro-slot. The configuration parameters corresponding to the configuration type of the DMRS comprise at least one of the following parameters: comb, cyclic shift of DMRS, and symbols occupied by DMRS.

The cyclic shift of the DMRS is used to distinguish DMRS sequences used by different User Equipments (UEs) or antenna ports, and the DMRS sequence is a sequence predetermined between a base station and the UE.

The symbols occupied by the DMRS include a time-domain position of the symbols occupied by the DMRS and a number of the symbols occupied by the DMRS. The time domain position of the symbol occupied by the DMRS may be a position where a first symbol of the micro slot is located, or may be a position where the first symbol of the micro slot is located and a position where an nth symbol of the micro slot is located, where N is a positive integer greater than 2. When the position of the symbol occupied by the DMRS is the position of the first symbol of the micro-slot, the DMRS is represented as a preposed DMRS; and when the position of the symbol occupied by the DMRS is the position of the Nth symbol of the micro-slot, indicating that the DMRS is the dynamic DMRS.

The number of the at least one configuration parameter is different in different configuration types. For example, the number of comb teeth is different in different configuration types, the number of cyclic shifts of DMRSs is different, or the number of symbols occupied by DMRSs is different. The number of the comb teeth comb can be 1 or 2; the number of cyclic shifts of the DMRS may be 2 or more, and the number of symbols occupied by the DMRS may be 1 or 2.

Further, in this embodiment of the present invention, if the number of symbols occupied by the minislot is a first number, it is determined that the configuration type of the DMRS corresponding to the minislot is a first configuration type; the first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot.

In this embodiment, the first number is 2 or 4. Because 2 symbol lengths or 4 mini-slots with the same length are mainly used for low-delay services, and the requirement on the data rate is not high, 2-stream Multiple-Input Multiple-Output (MIMO) can be supported at most for the mini-slots with the same length or with the same length as 2 symbol lengths or 4 symbol lengths, that is, multiplexing of 2 antenna ports or multiplexing of two User Equipments (UEs) is supported, and DMRS sequences of 2 ports can be mapped in the first symbol of the mini-slot with the same length or with the same length as 4 symbol lengths.

The first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot. In other words, a 2 or 4 symbol mini-slot may include only one symbol of the preamble DMRS, excluding the dynamic demodulation reference signal. One comb and two cyclic shifts are used for indicating that in the same scheduling bandwidth, at most two user equipments (UE performs multiplexing, and DMRSs corresponding to the two UE achieve orthogonality through the cyclic shifts) are allowed, or two different ports of the same UE perform multiplexing, and the DMRSs corresponding to the different ports achieve orthogonality through different cyclic shift values.

Further, in the embodiment of the present invention, if the number of symbols occupied by the minislots is the second number, the time-varying speed of the channel is obtained.

In an embodiment of the invention, the second number is 7, i.e. 7 symbols of mini-slots. The base station may obtain the channel time-varying speed obtained through the sounding reference signal test, and compare the obtained channel time-varying speed with a preset time-varying speed threshold, where the preset time-varying speed threshold may be set according to parameters of each channel in practical application, and is not limited herein.

And if the channel time-varying speed is less than or equal to a preset time-varying speed threshold, determining that the configuration type of a demodulation reference signal (DMRS) corresponding to the micro-slot is a second configuration type, wherein the second configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS is a front DMRS, and the front DMRS is mapped to a first symbol of the micro-slot.

The second configuration type corresponds to 2 comb teeth and 2 cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot. The 2 comb teeth and the 2 cyclic shifts indicate that in the same scheduling bandwidth, at most four UEs are allowed to perform Multi-User Multiple-Input Multiple-Output (MU-MIMO) multiplexing or four ports of the same UE perform single-User Multiple-Input Multiple-Output (SU-MIMO) multiplexing.

If the channel time-varying speed is greater than a preset time-varying speed threshold, determining that the configuration type of the demodulation reference signal DMRS corresponding to the micro time slot is a third configuration type; the third configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS comprises a front DMRS and a dynamic DMRS, the front DMRS is mapped to a first symbol of the micro-slot, and the dynamic DMRS is mapped to an Nth symbol of the micro-slot, wherein N is a positive integer greater than 2.

The third configuration type corresponds to 2 comb teeth and 2 cyclic shifts, the DMRS comprises a pre-DMRS and a dynamic DMRS, the pre-DMRS is mapped to a first symbol of the micro-slot, and the dynamic DMRS is mapped to an Nth symbol of the micro-slot, wherein N is a positive integer greater than 2.

Further, in the embodiment of the present invention, N has a value of 5.

Referring to fig. 2, fig. 2 is a diagram illustrating an example of data scheduling based on a self-contained frame structure according to an embodiment of the present invention. The self-contained (self-contained) frame structure includes a downlink symbol DL, a Guard interval (GP), and an uplink symbol UL in the same subframe. As shown in fig. 2, the data area within a self-contained subframe comprises a minislot of symbol length 7. A preamble DMRS is mapped into a first symbol of a micro-slot, and a dynamic DMRS is mapped into a fifth symbol of the micro-slot. Wherein the first symbol of the micro-slot corresponds to the 3 rd symbol of the subframe and the fifth symbol of the micro-slot corresponds to the 7 th symbol of the subframe.

In fig. 2, 4 symbols are spaced between the symbol for mapping the preamble DMRS and the symbol for mapping the dynamic DMRS in the micro-slot, and in other embodiments, 5 symbols may be spaced between the symbol for mapping the preamble DMRS and the symbol for mapping the dynamic DMRS.

S102: and determining at least one user equipment scheduled in the micro time slot and the value of the configuration parameter corresponding to the at least one user equipment according to the configuration type.

The base station may determine at least one user equipment performing uplink scheduling or downlink scheduling in the micro-slot according to the configuration type. For example, if the symbol length of the micro slot is 2 or 4, the configuration type is determined to be the first configuration type, and at most two user equipments UEs can be scheduled simultaneously in the same scheduling bandwidth in the micro slot. The uplink scheduling refers to that the user equipment sends data and the DMRS in the micro-slot, and the downlink scheduling refers to that the base station sends the data and the DMRS in the micro-slot.

The values of the configuration parameters of the DMRS corresponding to the UE may be values corresponding to respective configuration parameters included in the determination of the configuration type. The configuration parameters in S102 may be comb fingers and cyclic shifts CS only, and the number of symbols and positions occupied by DMRSs may be determined by the configuration type of DMRSs.

For example, when the set of values of Comb in the configuration type is {0,1}, 0 may be selected to indicate that an odd subcarrier carries DMRS, and 1 may be selected to indicate that an even subcarrier carries DMRS; or 1 may be selected to indicate that the odd subcarriers carry the DMRS, and 0 may be selected to indicate that the even subcarriers carry the DMRS.

When the base station schedules 2 UEs in the micro time slot and two UEs are multiplexed, if the Comb number in the configuration type is 1, the Comb numbers of the 2 UEs are the same, and may be both 0 or both 1. Assuming that CS values of DMRS are set to {0,3,6,9}, two multiplexed UEs achieve orthogonality by selecting different values respectively.

That is, if the configuration type determined by the base station is the first configuration type, if one UE is scheduled and only one antenna port is occupied, the base station only needs to determine the value of the comb teeth; if one UE is scheduled and two antenna ports are multiplexed, the base station needs to determine the value of the comb and the value of the CS of the DMRS for the two antenna ports. If 2 UEs are scheduled, the base station needs to determine the values of the comb fingers and the CS values of the DMRSs corresponding to the two UEs, respectively.

Referring to fig. 3 and fig. 4 together, fig. 3 is a schematic diagram of a DMRS of a 2-symbol-length minislot according to an embodiment of the present invention; fig. 4 is a DMRS diagram of a 4-symbol-length minislot according to an embodiment of the present invention. As shown in fig. 3 or fig. 4, the value of the comb determined by the base station is 0, which indicates that the DMRS sequence is mapped to an odd subcarrier and the DMRS is carried by the odd subcarrier.

Referring to fig. 5, fig. 5 is a diagram illustrating an example of data scheduling based on a self-contained frame structure according to another embodiment of the present invention. As shown in fig. 5, the data area in a self-contained subframe includes a first minislot, a second minislot and a third minislot. The symbol lengths of the first and second micro-slots are 2, and the symbol length of the third micro-slot is 4. UE1 is scheduled in the first mini-slot, UE2 and UE3 are scheduled in the third mini-slot, and data is transmitted by means of MU-MIMO.

For UE1, the preamble demodulation reference signal is located on the 1 st symbol of the first minislot, occupying odd subcarriers; for UE2 and UE3, the preamble demodulation reference signal is located on the 1 st symbol of the third minislot, occupying odd subcarriers, and DMRSs of UE2 and UE3 remain orthogonal by using different values of CS in the frequency domain. The value of CS may be set according to practical situations, and is not limited herein.

Further, if the determined configuration type is the second configuration type or the determined configuration type is the third configuration type, if at least 2 UEs are scheduled, the base station needs to determine the values of the comb teeth and the CS values of the DMRSs corresponding to each UE.

Because the requirements of time delay and data rate need to be comprehensively considered for the mini-slots with the length of 7 symbols, for the most 4-stream MIMO supported by the mini-slots with the length of 7 symbols, multiplexing of 4 antenna ports is supported, and the mini-slots with the length of 7 symbols can map DMRS sequences of 4 ports.

The DMRS sequences of different antenna ports are distinguished by the comb occupied in the frequency domain and the CS. The values of the comb teeth corresponding to any two antenna ports may be the same or different.

If the number of the comb teeth is 1, the values of the comb teeth of the multiplexed UE are the same and are all 0 or 1, and the same subcarriers are occupied, namely odd subcarriers or even subcarriers are multiplexed; if the number of comb fingers is 2, two UEs may occupy different subcarriers, one with a value of 0 and the other with a value of 1.

For example, the value of the comb corresponding to the first UE indicates that the odd subcarriers carry the DMRS; the values of the comb teeth corresponding to the second UE and the third UE indicate that the even subcarriers bear the DMRS, and the DMRS sequence of the second UE is distinguished from the DMRS sequence of the third UE through the CS.

For example, the value of the comb corresponding to the second UE indicates that the even subcarriers in the first symbol of the micro slot carry the DMRS; the value of the comb corresponding to the third UE indicates that the even subcarriers in the first symbol of the micro slot carry the DMRS. The second UE adopts a third DMRS sequence, the third UE adopts a fourth DMRS sequence, and the third DMRS sequence and the fourth DMRS sequence are distinguished through CS.

S103: and sending the configuration type and the value of the configuration parameter to the at least one user equipment.

Referring to fig. 6, fig. 6 is a flowchart illustrating an implementation of a method for sending a demodulation reference signal according to another embodiment of the present invention. The difference between this embodiment and the previous embodiment is: in order to improve the data processing efficiency of the base station and the UE, when at least one UE scheduled in the micro slot is configured with only one comb, the method for transmitting the demodulation reference signal further includes S204. In this embodiment, S201 to S203 are the same as S101 to S103 in the previous embodiment, and please refer to the description related to S101 to S103 in the previous embodiment, which is not described herein again.

S204: and transmitting or receiving data on subcarriers except the subcarriers occupied by the DMRS in the symbols occupied by the DMRS.

Referring to fig. 4 again, as shown in fig. 4, the data area in a self-contained subframe includes a first minislot, a second minislot and a third minislot. The symbol lengths of the first and second micro-slots are 2, and the symbol length of the third micro-slot is 4. UE1 is scheduled in the first mini-slot, UE2 and UE3 are scheduled in the third mini-slot, and data is transmitted by Multi-User Multiple-Input Multiple-Output (MU-MIMO).

For the UE1, the pre-DMRS is located on the 1 st symbol of the first minislot, occupying odd subcarriers, which may be used for mapping data; for UE2 and UE3, the pre-DMRS is located on the 1 st symbol of the second mini-slot, occupying odd subcarriers, the DMRSs of UE2 and UE3 remain orthogonal by using different values of CS in the frequency domain, and even subcarriers can be used for mapping data. The value of CS may be set according to practical situations, and is not limited herein.

In the embodiment of the invention, the base station ensures the real-time performance of channel estimation through the DMRS and the channel estimation performance by setting different DMRS configuration types and determining the corresponding DMRS configuration type according to the number of symbols occupied by the minislots.

In addition, when the time-varying speed of the channel is greater than a preset time-varying speed threshold, the dynamic DMRS is added to ensure the channel estimation performance, and the phenomenon that the channel estimation errors of a plurality of symbols behind the micro-slot become large due to the fact that only the front DMRS is adopted for new estimation is avoided; only one column of dynamic DMRS is added to reduce pilot overhead.

Referring to fig. 7, fig. 7 is a flowchart illustrating an implementation of a method for receiving a demodulation reference signal according to an embodiment of the present invention, where in the embodiment corresponding to fig. 7, an execution main body of the flowchart is a User Equipment (UE). The user equipment is a terminal device capable of communicating with the network side device, and the user equipment may be a mobile phone, a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), a wearable device (e.g., a smart watch (such as iWatch), a smart band, a pedometer, etc.), and the like.

S701: receiving a configuration type of a demodulation reference signal (DMRS) sent by a base station; the configuration type is determined according to the number of symbols occupied by the scheduled micro time slot, and the configuration parameters corresponding to the configuration type comprise at least one of the following items: the comb teeth, the cyclic shift of the DMRS and the symbols occupied by the DMRS are different, and the number of at least one configuration parameter in different configuration types is different.

And the UE receiving base station determines the configuration type of the demodulation reference signal DMRS corresponding to the micro time slot according to the symbol number occupied by the scheduled micro time slot. The configuration parameters corresponding to the configuration type of the DMRS comprise at least one of the following parameters: comb, cyclic shift of DMRS, and symbols occupied by DMRS.

The cyclic shift of the DMRS is used to distinguish DMRS sequences used by different UEs or antenna ports, and the DMRS sequence is a sequence predetermined between the base station and the receiving end.

Further, if the configuration type of the DMRS corresponding to the minislot is a first configuration type, the number of symbols occupied by the minislot is a first number; the first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot.

And when the configuration type of the DMRS corresponding to the micro-slot is the first configuration type, the UE judges that the number of symbols occupied by the scheduled micro-slot is the first number.

The first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot. In other words, a 2 or 4 symbol mini-slot may include only one symbol of the preamble DMRS, excluding the dynamic demodulation reference signal. One comb and two cyclic shifts are used for indicating that multiplexing is allowed to be carried out on at most two User Equipment (UE) in the same scheduling bandwidth, and DMRSs corresponding to the two UE are orthogonal through the cyclic shift CS; or two different ports of the same user equipment UE are multiplexed, and the DMRSs corresponding to the different ports are orthogonal through different values of the cyclic shift CS.

Further, in this embodiment of the present invention, if the configuration type is a second configuration type, the number of symbols occupied by the micro slot is a second number, the second configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro slot.

And when the configuration type of the DMRS corresponding to the micro-slot is a second configuration type, the UE judges that the number of symbols occupied by the scheduled micro-slot is a second number, and the channel time-varying speed is less than or equal to a preset time-varying speed threshold.

In an embodiment of the invention, the second number is 7, i.e. 7 symbols of mini-slots. The preset time-varying speed threshold may be set according to parameters of each channel in practical applications, and is not limited herein.

The second configuration type corresponds to 2 comb teeth and 2 cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot. The 2 comb fingers and the 2 cyclic shifts are used to indicate that up to four UEs are allowed to be multiplexed or four ports of the same UE are multiplexed within the same scheduling bandwidth.

Because the requirements of time delay and data rate need to be comprehensively considered for the mini-slots with the length of 7 symbols, 4-stream MIMO can be supported at most for the mini-slots with the length of 7 symbols, multiplexing of 4 antenna ports is supported, and the DMRS sequences of 4 ports can be mapped by the mini-slots with the length of 7 symbols.

For example, the value of the comb corresponding to the first antenna port indicates that the odd subcarriers carry the DMRS; and the values of the comb teeth corresponding to the second antenna port and the third antenna port indicate that the even subcarriers bear the DMRS, and the DMRS sequence of the second antenna port and the DMRS sequence of the third antenna port are orthogonal through different CS values.

For example, the value of the comb corresponding to the second antenna port indicates that the even subcarriers in the first symbol of the micro slot carry the DMRS; the value of the comb corresponding to the third antenna port indicates that the even subcarriers in the first symbol of the micro slot carry the DMRS. And the second antenna port adopts a third DMRS sequence, the third antenna port adopts a fourth DMRS sequence, and the third DMRS sequence and the fourth DMRS sequence are orthogonal through different CS values.

Further, if the configuration type is a third configuration type, the number of symbols occupied by the minislots is a second number; the third configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS comprises a front DMRS and a dynamic DMRS, the front DMRS is mapped to a first symbol of the micro-slot, and the dynamic DMRS is mapped to an Nth symbol of the micro-slot, wherein N is a positive integer greater than 2.

And when the configuration type of the DMRS corresponding to the micro-slot is a third configuration type, the UE judges that the number of symbols occupied by the scheduled micro-slot is a second number, and the channel time-varying speed is greater than a preset time-varying speed threshold.

Further, the value of N is 5.

S702: and receiving the value of the configuration parameter of the DMRS, which is sent by the base station.

The values of the configuration parameters of the DMRS may be values corresponding to the configuration parameters included in the determination of the configuration type. The configuration parameters in S702 may be only comb teeth and CS, and the number of symbols and positions occupied by the DMRSs may be determined by the configuration type of the DMRSs acquired in S701.

For example, when the value of comb in the configuration type is 0, it indicates that the odd subcarriers carry the DMRS, and when the value of comb in the configuration type is 1, it indicates that the even subcarriers carry the DMRS. In other embodiments, when the value of comb in the configuration type is 1, it indicates that the odd subcarriers carry the DMRS, and when the value of comb in the configuration type is 0, it indicates that the even subcarriers carry the DMRS. Wherein the set of values of comb in configuration type is {0,1 }.

S703: and determining the sequence of the DMRS and the subcarrier to be mapped according to the configuration type of the DMRS and the value of the configuration parameter.

For example, when the configuration type of the DMRS is a first configuration type, the value of comb teeth in the first configuration type is 0, the value of CS is 0, the number of symbols occupied by the DMRS is 1, and the position of the symbol occupied by the DMRS is a first symbol, the UE acquires a sequence of a pre-DMRS corresponding to the first configuration type, and determines a subcarrier to which the sequence of the pre-DMRS is to be mapped from subcarriers included in the first symbol of the micro-slot according to the value of the comb teeth and the value of CS. And when the value of the comb teeth is 0 and indicates that the odd subcarriers bear the DMRS, the UE determines the odd subcarriers as the subcarriers of the sequence to be mapped with the DMRS.

When the configuration type of the DMRS is a second configuration type, the value of comb teeth in the second configuration type is 0, the value of CS is 3, the number of symbols occupied by the DMRS is 1, and the position of the symbol occupied by the DMRS is a first symbol, the UE acquires the sequence of the pre-DMRS corresponding to the first configuration type, and determines the subcarrier of the sequence to be mapped with the pre-DMRS from the subcarrier contained in the first symbol of the micro-slot according to the value of the comb teeth and the value of the CS. And when the value of the comb teeth is 0 and indicates that the odd subcarriers bear the DMRS, the UE determines the odd subcarriers as the subcarriers of the sequence to be mapped with the DMRS.

For example, referring to fig. 8 together, fig. 8 is a diagram illustrating an example of data scheduling based on a self-contained frame structure according to still another embodiment of the present invention. As shown in fig. 8, the data area within a self-contained subframe includes a minislot of symbol length 7. The UEs 1 to UE4 are scheduled in the micro slot, and transmit data by MU-MIMO, where the number of streams of MU-MIMO is 4.

For UE1 and UE2, the pre-demodulation reference signal is located on the 1 st symbol of the micro slot, and occupies odd subcarriers, and DMRSs of two terminals are orthogonal by using different CS values in the frequency domain; for UE3 and UE4, the pre-DMRSs are located on the 1 st symbol of the minislot, and occupy even subcarriers, DMRSs of the two UEs are orthogonal through different CS values, and the CS values may be specifically set according to actual situations, which is not limited herein.

When the configuration type of the DMRS is a third configuration type, the value of comb teeth in the third configuration type is 0, the value of CS is 0, the number of symbols occupied by the DMRS is 2, and the positions of the symbols occupied by the DMRS are a first symbol and a 5th symbol, the UE acquires a sequence of a pre-DMRS and a sequence of a dynamic DMRS corresponding to the third configuration type, determines a subcarrier of the sequence to be mapped with the pre-DMRS from subcarriers contained in the first symbol of the micro-slot according to the value of the comb teeth and the value of the CS, and determines a subcarrier of the sequence to be mapped with the dynamic DMRS from subcarriers contained in the fifth symbol of the micro-slot.

S704: mapping or demodulating the sequence of the DMRS to or at the determined subcarrier.

When the configuration type of the DMRS is a first configuration type and the determined subcarriers are odd subcarriers, in uplink transmission, the UE maps the sequence of the preposed DMRS to the odd subcarriers in the first symbol of the micro-slot; or, in downlink transmission, demodulating the pre-DMRS carried by the odd subcarriers of the first symbol of the micro-slot.

When the configuration type of the DMRS is a third configuration type, the determined subcarriers are odd subcarriers, and the positions of the symbols occupied by the DMRS are a first symbol and a 5th symbol, in uplink transmission, the UE maps the sequence of the front DMRS to the odd subcarriers in the first symbol of the micro-slot and maps the sequence of the dynamic DMRS to the odd subcarriers in the fifth symbol of the micro-slot; or, in downlink transmission, demodulating the pre-DMRS carried by the odd sub-carrier at the odd sub-carrier of the first symbol of the micro-slot, and demodulating the dynamic DMRS carried by the odd sub-carrier at the odd sub-carrier of the fifth symbol of the micro-slot.

And the UE acquires the sequence of the pre-DMRS and the sequence of the dynamic DMRS corresponding to the third configuration type, determines a subcarrier of the sequence to be mapped with the pre-DMRS from a subcarrier contained in the first symbol of the micro-slot according to the value of the comb teeth and the value of the CS, and determines a subcarrier of the sequence to be mapped with the dynamic DMRS from a subcarrier contained in the fifth symbol of the micro-slot.

In uplink transmission, the DMRS is used for channel estimation by the base station. In downlink transmission, the DMRS is used for the UE to perform channel estimation.

Referring to fig. 9, fig. 9 is a flowchart illustrating an implementation of a method for receiving a demodulation reference signal according to another embodiment of the present invention. The difference between this embodiment and the previous embodiment is: in order to improve the data processing efficiency of the base station and the UE, when the number of comb teeth corresponding to the configuration type is 1, the method for receiving the demodulation reference signal further includes: and S905. S901 to S904 in this embodiment are the same as S701 to S704 in the previous embodiment, and please refer to the description related to S701 to S704 in the previous embodiment, which is not described herein again.

S905: and transmitting or receiving data on subcarriers except the subcarriers occupied by the DMRS in the symbols occupied by the DMRS.

In uplink transmission, UE transmits data in symbols occupied by DMRS and subcarriers except subcarriers occupied by the DMRS; in downlink transmission, the UE receives data on subcarriers other than the subcarriers occupied by the DMRS within the symbols occupied by the DMRS.

For example, when the subcarriers occupied by the DMRS are odd subcarriers, in uplink transmission, the UE transmits data in even subcarriers within the symbols occupied by the DMRS; in downlink transmission, the UE receives data on even subcarriers within the symbols occupied by the DMRS.

In the embodiment of the invention, the DMRS is preposed, so that a receiving end can complete the analysis of the DMRS more quickly, and the real-time performance of channel estimation of receiving equipment can be ensured.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Corresponding to the above method for performing demodulation reference signal transmission by a base station, fig. 10 shows a schematic block diagram of a base station provided by an embodiment of the present invention, and the base station includes a unit for performing each step in the method for performing demodulation reference signal transmission described in any of the foregoing embodiments. For convenience of explanation, only the portions related to the present embodiment are shown. Specifically, referring to fig. 10, the base station 10 includes the following program units:

a configuration unit 1010, configured to determine, according to the number of symbols occupied by a minislot, a configuration type of a demodulation reference signal DMRS corresponding to the minislot; the configuration parameters corresponding to the configuration type comprise at least one of the following items: comb teeth, cyclic shift of DMRS and symbols occupied by the DMRS, wherein the number of at least one configuration parameter in different configuration types is different;

a determining unit 1020, configured to determine, according to the configuration type, at least one ue scheduled in the micro timeslot and a value of the configuration parameter corresponding to the at least one ue;

a first sending unit 1030, configured to send the configuration type and the value of the configuration parameter to the at least one ue.

Further, the configuration unit 1010 includes:

a first configuration unit 1011, configured to determine that the configuration type of the DMRS corresponding to the minislot is a first configuration type if the number of symbols occupied by the minislot is a first number; the first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot.

Further, the configuration unit 1010 includes:

an obtaining unit 1012, configured to obtain a channel time varying speed if the number of symbols occupied by the micro time slot is a second number;

a second configuration unit 1013, configured to determine, if the channel time-varying speed is less than or equal to a preset time-varying speed threshold, that the configuration type of the DMRS corresponding to the micro slot is a second configuration type, where the second configuration type corresponds to 2 comb teeth and two cyclic shifts, and the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro slot.

Further, the configuration unit 1010 further includes:

a third configuration unit 1014, configured to determine, if the channel time-varying speed is greater than a preset time-varying speed threshold, that the configuration type of the demodulation reference signal DMRS corresponding to the minislot is a third configuration type; the third configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS comprises a front DMRS and a dynamic DMRS, the front DMRS is mapped to a first symbol of the micro-slot, and the dynamic DMRS is mapped to an Nth symbol of the micro-slot, wherein N is a positive integer greater than 2.

Further, the value of N is 5.

Further, the at least one user equipment is configured with only one comb, and the base station further comprises:

a second transmitting unit 1040, configured to transmit or receive data on subcarriers other than the subcarriers occupied by the DMRS in the symbol occupied by the DMRS.

Corresponding to the above method for receiving a demodulation reference signal by a user equipment UE as a main execution body, fig. 11 shows a schematic block diagram of a user equipment provided by an embodiment of the present invention, and the user equipment includes a unit for executing each step in the method for receiving a demodulation reference signal described in any of the foregoing embodiments. For convenience of explanation, only the portions related to the present embodiment are shown. Specifically, referring to fig. 11, the user equipment 11 includes the following program units:

a first receiving unit 1110, configured to receive a configuration type of a demodulation reference signal DMRS transmitted by a base station; the configuration type is determined according to the number of symbols occupied by the scheduled micro time slot, and the configuration parameters corresponding to the configuration type comprise at least one of the following items: comb teeth, cyclic shift of DMRS and symbols occupied by the DMRS, wherein the number of at least one configuration parameter in different configuration types is different;

further, if the configuration type of the DMRS corresponding to the minislot is a first configuration type, the number of symbols occupied by the minislot is a first number; the first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a front DMRS, and the front DMRS is mapped to a first symbol of the micro-slot;

further, if the configuration type is a second configuration type, the number of symbols occupied by the micro slot is a second number, the second configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro slot;

Further, the value of N is 5.

A second receiving unit 1120, configured to receive a value of the configuration parameter of the DMRS transmitted by the base station;

a determining unit 1130, configured to determine a sequence of the DMRS and a subcarrier to be mapped according to the configuration type of the DMRS and the value of the configuration parameter;

a first control unit 1140 for mapping or demodulating the sequence of the DMRS to or at the determined subcarriers.

Further, if the number of the comb teeth corresponding to the configuration type is 1, the user equipment may further include:

a second control unit 1150, configured to transmit or receive data in subcarriers other than the subcarriers occupied by the DMRS in the symbol occupied by the DMRS.

Referring to fig. 12, a schematic block diagram of a base station according to another embodiment of the present invention is shown. The base station in this embodiment as shown in the figure may include: one or more processors 1201; one or more antennas 1202 and a memory 1203. The processor 1201, the antenna 1202, and the memory 1203 are connected by a bus 1204. The memory 1203 is used to store a computer program comprising program instructions, and the processor 1201 is used to execute the program instructions stored by the memory 1203. Wherein the processor 1201 is configured to invoke the program instructions to perform:

Further, the processor 1201 is specifically configured to invoke the program instructions to perform:

if the number of symbols occupied by the minislot is a first number, determining that the configuration type of the DMRS corresponding to the minislot is a first configuration type; the first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro-slot.

if the number of the symbols occupied by the micro time slot is a second number, acquiring a time-varying speed of a channel;

Further, the processor 1201 is also configured to invoke the program instructions to perform:

Further, the value of N is 5.

Optionally, the at least one user equipment is configured with only one comb, and the processor 1401 is further configured to invoke the program instructions to perform: and transmitting or receiving data on subcarriers except the subcarriers occupied by the DMRS in the symbols occupied by the DMRS.

Referring to fig. 13, a schematic block diagram of a user equipment according to another embodiment of the present invention is shown. The user equipment in the present embodiment as shown in the figure may include: one or more processors 1301; one or more antennas 1302 and memory 1303. The processor 1301, the antenna 1302, and the memory 1303 are connected by a bus 1304. The memory 1303 is used to store computer programs comprising program instructions, and the processor 1301 is used to execute the program instructions stored in the memory 1303. Wherein, the processor 1301 is configured to invoke the program instructions to perform:

Further, if the configuration type is a second configuration type, the number of symbols occupied by the micro slot is a second number, the second configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the micro slot.

Further, the value of N is 5.

Optionally, if the number of the comb teeth corresponding to the configuration type is 1, the processor 1401 is further configured to invoke the program instruction to execute:

and transmitting or receiving data on subcarriers except the subcarriers occupied by the DMRS in the symbols occupied by the DMRS.

It should be understood that in the embodiments of the present invention, the Processor may be a Central Processing Unit (CPU), and the Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory referred to above may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information.

In another embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program comprising program instructions that when executed by a processor implement:

a method for transmitting a demodulation reference signal, comprising:

Further, the program instructions, when executed by the processor, implement:

Further, the program instructions when executed by the processor further implement:

Further, the value of N is 5.

Optionally, the at least one user equipment is configured with only one comb, the program instructions when executed by the processor further implementing: and transmitting or receiving data on subcarriers except the subcarriers occupied by the DMRS in the symbols occupied by the DMRS.

In a further embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program comprising program instructions that when executed by a processor implement:

a method of receiving a demodulation reference signal, comprising:

Further, the value of N is 5.

Optionally, if the number of comb teeth corresponding to the configuration type is 1, the program instructions when executed by the processor further implement: and transmitting or receiving data on subcarriers except the subcarriers occupied by the DMRS in the symbols occupied by the DMRS.

The computer readable storage medium may be an internal storage unit of the base station or the user equipment according to any of the foregoing embodiments, for example, a hard disk or a memory of the base station or the user equipment. The computer readable storage medium may also be an external storage device of the base station or the user equipment, such as a plug-in hard disk provided on the base station or the user equipment, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the computer readable storage medium may also include both an internal storage unit of the base station or the user equipment and an external storage device. The computer readable storage medium is used for storing the computer program and other programs and data required by a base station or a user equipment. The computer readable storage medium may also be used to temporarily store data that has been output or is to be output.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the base station, the terminal and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, terminal and method can be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting a demodulation reference signal, comprising:

determining a configuration parameter of a demodulation reference signal (DMRS) corresponding to at least one user equipment according to the symbol number of the scheduled symbols; the configuration parameters include at least one of: comb teeth, cyclic shift of DMRS and symbols occupied by the DMRS;

mapping a demodulation reference signal (DMRS) corresponding to the at least one user equipment in the scheduled symbol according to the configuration parameter;

transmitting the demodulation reference signal (DMRS) within the scheduled symbol.

2. The method of claim 1, wherein the determining the configuration parameter of the DMRS corresponding to at least one user equipment according to the symbol number of the scheduled symbol comprises:

if the number of the symbols of the scheduled symbols is a first number, determining that the configuration type of the DMRS is a first configuration type; the configuration parameters corresponding to the first configuration type are one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the scheduled symbols.

3. The method of claim 1, wherein the determining the configuration parameter of the DMRS corresponding to at least one user equipment according to the symbol number of the scheduled symbol comprises:

if the number of the symbols of the scheduled symbols is a second number, acquiring a channel time-varying speed;

and if the channel time-varying speed is less than or equal to a preset time-varying speed threshold, determining that the configuration type of the demodulation reference signal DMRS is a second configuration type, wherein configuration parameters corresponding to the second configuration type are two comb teeth and two cyclic shifts, the DMRS is a front DMRS, and the front DMRS is mapped to a first symbol of the scheduled symbol.

4. The method of claim 3, wherein the determining the configuration parameter of the DMRS corresponding to the at least one user equipment according to the number of symbols occupied by the scheduled symbols further comprises:

if the channel time-varying speed is greater than a preset time-varying speed threshold, determining that the configuration type of the demodulation reference signal DMRS is a third configuration type; the configuration parameters corresponding to the third configuration type are two comb teeth and two cyclic shifts, the DMRSs include a pre-DMRS and a dynamic DMRS, the pre-DMRS is mapped to a first symbol of the scheduled symbols, and the dynamic DMRS is mapped to an nth symbol of the scheduled symbols, where N is a positive integer greater than 2.

5. The method according to any of claims 1-4, wherein if the at least one user equipment is configured with only one comb, the method further comprises:

6. A method for receiving a demodulation reference signal, comprising:

receiving a configuration type of a demodulation reference signal (DMRS) sent by a base station; the configuration type is determined according to the symbol number of the scheduled symbol, and the configuration parameters corresponding to the configuration type include at least one of the following: comb teeth, cyclic shift of DMRS and symbols occupied by the DMRS, wherein the number of at least one configuration parameter in different configuration types is different;

mapping or demodulating the sequence of the DMRS to or at the determined subcarriers;

wherein, if the number of the comb teeth corresponding to the configuration type is 1, the method further comprises:

7. The method of claim 6, wherein the number of symbols of the scheduled symbol is a first number if the configuration type of the DMRS is a first configuration type; the first configuration type corresponds to one comb and two cyclic shifts, the DMRS is a pre-DMRS, and the pre-DMRS is mapped to a first symbol of the scheduled symbols.

8. The method of claim 6, wherein the number of symbols of the scheduled symbol is a second number if the configuration type is a second configuration type, wherein the second configuration type corresponds to 2 comb teeth and two cyclic shifts, and wherein the DMRS is a preamble DMRS that is mapped to a first symbol of the scheduled symbol.

9. The method of claim 8, wherein if the configuration type is a third configuration type, the number of symbols of the scheduled symbol is a second number; the third configuration type corresponds to 2 comb teeth and two cyclic shifts, the DMRS comprises a preamble DMRS and a dynamic DMRS, the preamble DMRS is mapped to a first symbol of the scheduled symbols, and the dynamic DMRS is mapped to an Nth symbol of the scheduled symbols, wherein N is a positive integer greater than 2.

10. A base station comprising a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory being interconnected, wherein the memory is configured to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any of claims 1 to 5.

11. A user device comprising a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory being interconnected, wherein the memory is configured to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any of claims 6 to 9.

12. A computer-readable storage medium, characterized in that the computer storage medium stores a computer program comprising program instructions that, when executed by a processor, cause the processor to perform the method according to any of claims 1-9.