Demodulation reference signal transmission method, demodulation reference signal transmission device, and readable storage medium

Abstract

The present application discloses a demodulation reference signal transmission method, device, terminal and network side equipment, which belong to the field of mobile communications. In an embodiment of the present application, the demodulation reference signal transmission method includes: a first communication device receives a target demodulation reference signal from a second communication device; and the first communication device performs channel estimation for the target demodulation reference signal, where the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a target length subsequence as a basic unit and according to a resource mapping rule corresponding to the target length subsequence, the frequency division cover code sequences are used for code division multiplexing of ports of the target demodulation reference signal, and N is a positive integer.

Description

[Technical field]

[0001] The present application relates to the field of mobile communications technology, and more particularly to a demodulation reference signal transmission method, device, terminal, and network side equipment. [Background technology]

[0002] In a conventional New Radio (NR) system, a data channel demodulation reference signal (DMRS) is designed based on a Frequency Division Orthogonal Cover Code (FD OCC) sequence of length 2. When the type of DMRS is configuration type 1, the maximum number of DMRS ports it can support is 8, and when the type of DMRS is configuration type 2, the maximum number of DMRS ports it can support is 12.

[0003] However, as the number of terminals connected to the network increases day by day, the number of ports of the traditional DMRS cannot meet the actual application demand, limiting the data traffic transmission. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide a demodulation reference signal transmission method, device, terminal, and network side equipment that can solve the problem that the number of traditional DMRS ports cannot meet actual application needs and limits transmission data traffic. [Means for solving the problem]

[0005] A first aspect provides a demodulation reference signal transmission method for use in a first communication device, the method comprising: receiving a target demodulation reference signal from a second communication device by a first communication device; performing channel estimation on the target demodulation reference signal by the first communication device; Here, the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a subsequence of a target length as a basic unit and according to a resource mapping rule corresponding to the subsequence of the target length, the frequency division cover code sequence is used for code division multiplexing of ports of the target demodulation reference signal, and N is a positive integer.

[0006] A second aspect provides a demodulation reference signal transmission device, the device comprising: a transceiver module for receiving a target demodulation reference signal from a second communication device; a computation module for performing channel estimation on the target demodulation reference signal; Here, the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a subsequence of a target length as a basic unit and according to a resource mapping rule corresponding to the subsequence of the target length, the frequency division cover code sequence is used for code division multiplexing of ports of the target demodulation reference signal, and N is a positive integer.

[0007] A third aspect provides a demodulation reference signal transmission method for use in a second communication device, the method comprising: A second communication device generates N frequency division cover code sequences according to a resource mapping rule corresponding to the target length subsequence as a basic unit, and the frequency division cover code sequence is used for code division multiplexing of a demodulation reference signal port of the target demodulation reference signal; The second communication device generates a target demodulation reference signal based on the N frequency division cover code sequences and sends it to the first communication device; Here, N is a positive integer.

[0008] A fourth aspect provides a demodulation reference signal transmission device, the device comprising: A generating module for generating N frequency division cover code sequences according to a resource mapping rule corresponding to the target length subsequence as a basic unit, the frequency division cover code sequences being used for code division multiplexing of demodulation reference signal ports of a target demodulation reference signal; a transmission module for generating a target demodulation reference signal based on the N frequency division cover code sequences and sending the target demodulation reference signal to a first communication device; Here, N is a positive integer.

[0009] A fifth aspect provides a terminal, the terminal including a processor and a memory, the memory storing a program or instructions operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the method of the first aspect.

[0010] A sixth aspect provides a terminal including a processor and a communications interface, wherein the processor is adapted to perform channel estimation on the target demodulation reference signal and the communications interface is adapted to receive the target demodulation reference signal from a second communications device.

[0011] A seventh aspect provides a network side device including a processor and a memory, the memory storing a program or instructions operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the method of the first aspect.

[0012] An eighth aspect provides a network side device, the network side device including a processor and a communication interface, wherein the processor is used for generating N frequency division cover code sequences with a target length subsequence as a basic unit and a resource mapping rule corresponding to the target length subsequence, the frequency division cover code sequence is used for code division multiplexing of a demodulation reference signal port of a target demodulation reference signal, and the communication interface is used for generating a target demodulation reference signal based on the N frequency division cover code sequences and sending it to a first communication device.

[0013] A ninth aspect provides a demodulation reference signal transmission system, the system including a terminal and a network side device, the terminal may be used to perform steps of the demodulation reference signal transmission method described in the first aspect, and the network side device may be used to perform steps of the demodulation reference signal transmission method described in the third aspect.

[0014] A tenth aspect provides a readable storage medium having a program or instructions stored thereon, the program or instructions, when executed by a processor, performing steps of the method of the first aspect or performing steps of the method of the third aspect.

[0015] An eleventh aspect provides a chip, the chip including a processor and a communication interface, the communication interface coupled to the processor, the processor running a program or instructions to implement the method of the first aspect or to be used to implement the method of the third aspect.

[0016] A twelfth aspect provides a computer program / program product, the computer program / program product being stored in a storage medium, and the computer program / program product being executed by at least one processor to realize steps of the demodulation reference signal transmission method described in the first aspect, or to realize steps of the demodulation reference signal transmission method described in the third aspect. Effect of the Invention

[0017] In an embodiment of the present application, a target demodulation reference signal is generated and transmitted based on a target length subsequence as a basic unit and a resource mapping rule corresponding to the target length subsequence, and the target demodulation reference signal is transmitted based on the N frequency division cover code sequences for channel estimation, so that the target DMRS can support more ports and increase the data traffic of transmission. [Brief description of the drawings]

[0018] [Figure 1] 1 is a structural schematic diagram of a wireless communication system to which the embodiments of the present application can be applied; [Diagram 2] 2 is a flowchart of a demodulation reference signal transmission method according to an embodiment of the present application; [Diagram 3] 2 is a schematic diagram of one pattern of a demodulation reference signal according to an embodiment of the present application; [Figure 4] FIG. 2 is another schematic pattern diagram of a demodulation reference signal according to an embodiment of the present application; [Diagram 5] FIG. 2 is another schematic pattern diagram of a demodulation reference signal according to an embodiment of the present application; [Figure 6] FIG. 2 is a schematic diagram of a resource pattern for despreading a demodulation reference signal according to an embodiment of the present application; [Figure 7] FIG. 13 is a schematic diagram of another resource pattern for despreading a demodulation reference signal according to an embodiment of the present application; [Figure 8]FIG. 2 is a structural schematic diagram of a demodulation reference signal transmission device according to an embodiment of the present application; [Figure 9] 4 is another flowchart of a demodulation reference signal transmission method according to an embodiment of the present application; [Figure 10] FIG. 2 is another structural schematic diagram of a demodulation reference signal transmission device according to an embodiment of the present application; [Figure 11] FIG. 2 is a schematic diagram of a communication device structure according to an embodiment of the present application; [Figure 12] FIG. 2 is a structural schematic diagram of a terminal according to an embodiment of the present application; [Figure 13] FIG. 2 is a structural schematic diagram of a network side device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The following clearly describes the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application are all within the scope of protection of the present application.

[0020] The terms "first," "second," etc. in the specification and claims of the present application are intended to distinguish between similar objects and are not intended to describe a particular order or sequence. It is to be understood that the terms so used are interchangeable where appropriate, such that the embodiments of the present application may be performed in an order other than that shown or described herein, and that the objects distinguished by "first" and "second" are generally of the same type and do not limit the number of objects, e.g., the first object may be one or more. It is to be noted that "and / or" in the specification and claims represents at least one of the objects connected, and the character " / " generally represents an "or" relationship between the related objects.

[0021] It should be noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be applied to other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are always used interchangeably, and the techniques described may be used in the above-mentioned systems and radio technologies, or in other systems and radio technologies. Although the following description describes a New Radio (NR) system for illustrative purposes and uses NR terminology in most of the description below, these techniques may be applied to applications other than NR system applications, such as 6th Generation (6G) communication systems.

[0022] 1 shows a block diagram of a wireless communication system to which an embodiment of the present application can be applied. The wireless communication system includes a terminal 11 and a network side device 12. Here, the terminal 11 may be a mobile phone, a tablet personal computer, a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a palmtop computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a vehicle user equipment (VUE), a pedestrian user equipment (PUE), a smart home (home equipment having a wireless communication function, such as a refrigerator, a television, a washing machine, or furniture), a game machine, a personal computer, a mobile phone, a mobile terminal (Mobile Internet Device), a mobile user equipment (MID), a mobile terminal (Mobile User Equipment ... The terminal side equipment 12 may be a terminal side equipment such as a terminal computer (PC), a deposit payment machine or a self-service machine, and the wearable device includes a smart watch, a smart wristband, a smart earphone, a smart glasses, a smart accessory (smart bracelet, a smart hand chain, a smart finger ring, a smart necklace, a smart ankle bracelet, a smart anklet, etc.), a smart band, a smart clothing, etc. It should be noted that the terminal 11 in the embodiment of the present application is not limited to a specific type. The network side equipment 12 may include an access network equipment or a core network equipment, where the access network equipment 12 may be referred to as a radio access network equipment, a radio access network (Radio Access Network, RAN), a radio access network function, or a radio access network unit.The access network equipment 12 may include a base station, a Wireless Local Area Network (WLAN) access point, or a WiFi node, and the base station may be called a Node B, an evolved Node B (eNB), an access point, a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a home B node, a home evolved B node, a Transmitting Receiving Point (TRP), or any other suitable term in the art. As long as the same technical effect is achieved, the base station is not limited to a specific technical term, and it should be explained that in the embodiments of the present application, only base stations in an NR system are introduced as examples, and the specific type of the base station is not limited.The core network devices are: Core Network Node, Core Network Function, Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (Local NEF or L-NEF), Binding Support Function (BSF), Application Function (Application Node Function (ADF)), and Application Node Function (ADN). It should be noted that the embodiments of the present application only take the core network device in the NR system as an example, and do not limit the specific type of the core network device.

[0023] In the following, the demodulation reference signal transmission method, apparatus, terminal and network side equipment according to the embodiments of the present application will be described in detail through several embodiments and application scenarios thereof in conjunction with the drawings.

[0024] As shown in Fig. 2, an embodiment of the present application provides a demodulation reference signal transmission method, and the execution body of the method is a first communication device, and the first communication device can be a network side device or a terminal, in other words, the method can be executed by software or hardware installed in the first communication device. The method includes the following steps:

[0025] S210, the first communication device receives a target demodulation reference signal from the second communication device.

[0026] Here, the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a subsequence of a target length as a basic unit and according to a resource mapping rule corresponding to the subsequence of the target length, the frequency division cover code sequence is used for code division multiplexing (CDM) of ports of the target demodulation reference signal, and N is a positive integer.

[0027] It should be understood that the second communication device may be a network side device or a terminal.

[0028] The second communication device is pre-configured with subsequences of various lengths, which may be designed according to actual needs, for example, subsequences with lengths of 2, 4 and 6, etc.

[0029] The second communication device may determine a target length subsequence from the various length subsequences, and generate N frequency division cover code sequences based on a resource mapping rule corresponding to the target length subsequence, where each frequency division cover code sequence may correspond to one or two ports among M ports belonging to the same code division multiplexing group (CDM group) in the target DMRS.

[0030] The target DMRS may be divided into a first configuration type and a second configuration type, where the first configuration type is associated with DMRS configuration type 1 and the second configuration type is associated with DMRS configuration type 2.

[0031] S220, the first communication device performs channel estimation on the target demodulation reference signal.

[0032] After receiving the target DMRS, the first communication device can perform channel estimation for the target DMRS based on a pre-set despreading rule.

[0033] If the DMRS is generated based only on a frequency division orthogonal cover code of length two, each CDM contains at most two mutually orthogonal DMRS ports; however, by using a frequency division cover code generated using a subsequence of a target length as a basic unit and then generating a DMRS based on the frequency division cover code, each CDM group may contain more mutually orthogonal DMRS ports, thereby increasing the total number of DMRS ports supported by the system.

[0034] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application use a subsequence of a target length as a basic unit, and generate N frequency division cover code sequences according to a resource mapping rule corresponding to the subsequence of the target length, and use the N frequency division cover code sequences to generate and transmit a target demodulation reference signal for channel estimation, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0035] Based on the above embodiment, further, the target length subsequence may include: a subsequence of a first length; a subsequence of a second length; and a subsequence of a third length, Here, the first length is 2, the second length is 4, and the third length is 6.

[0036] The embodiment of the present application will be described by taking the subsequences having the above three lengths as examples.

[0037] In one embodiment, the first length subsequence comprises: A first subsequence, [+1,+1], A second subsequence, [+1,-1], A third subsequence, [-1,-1], and the fourth subsequence [-1, +1].

[0038] Here, the third subsequence may be generated by multiplying the first subsequence by −1, and the fourth subsequence may be generated by multiplying the second subsequence by −1.

[0039] In one embodiment, the second length subsequence comprises: A fifth subsequence, [+1,+1,+1,+1]; A sixth subsequence, [+1,-1,+1,-1]; The seventh subsequence [+1,+1,-1,-1]; and the eighth subsequence [+1, -1, -1, +1].

[0040] In one embodiment, the third length subsequence comprises: The ninth subsequence, [+1,+1,+1,+1,+1,+1], the tenth subsequence [+1,-1,+1,-1,+1,-1]; an eleventh subsequence, [+1,+1,-1,-1,+1,+1]; and a twelfth subsequence [+1, -1, -1, +1, +1, -1].

[0041] In one embodiment, based on the different length subsequences, the frequency division cover code sequence is A subsequence of a first length is taken as a basic unit, and the subsequence of the first length is mapped to two subcarriers in a symbol occupied by the port in the form of a first mapping rule, and the two subcarriers belong to the same radio bearer (RB); Taking a subsequence of a second length as a basic unit, mapping the subsequence of the second length to four subcarriers in a symbol occupied by the port in the form of a second mapping rule, and the four subcarriers belong to the same RB or two RBs; a subsequence of a third length is generated as a basic unit, and the subsequence of the third length is mapped to six subcarriers in a symbol occupied by the port in the form of a third mapping rule, and the six subcarriers belong to the same RB.

[0042] When the first length subsequence, ie, the subsequence with a length of 2, is the target length subsequence, a specific example of the corresponding first mapping rule is as follows:

[0043] In one embodiment, when generating a frequency division cover code sequence using a first subsequence as a basic unit, the first mapping rule is to map the first subsequence to subcarriers in the symbols occupied by the ports in order.

[0044] In another embodiment, when generating a frequency division cover code sequence using the second subsequence as a basic unit, the first mapping rule is to map the second subsequences to subcarriers in the symbols occupied by the ports in order.

[0045] In one embodiment, when a frequency division cover code sequence is generated using the first subsequence and the third subsequence as a basic unit, the first mapping rule is to alternately map the first subsequence and the third subsequence to subcarriers in a symbol occupied by a port.

[0046] In another embodiment, when a frequency division cover code sequence is generated using the second subsequence and the fourth subsequence as a basic unit, the first mapping rule is to alternately map the second subsequence and the fourth subsequence to subcarriers in a symbol occupied by a port.

[0047] It should be understood that the symbols occupied by the ports may be Orthogonal Frequency Division Multiplex (OFDM) symbols or other symbols, and are not specifically limited herein.

[0048] As shown in Figures 3 and 4, this is one DMRS pattern of a single symbol structure of a first configuration type, which includes two CDM groups, and CDM group 0 and CDM group 1 respectively correspond to resource units of different patterns, where CDM group 0 corresponding to the resource units of the diagonal line image corresponds to port 0 and port 1, CDM group 1 corresponding to the resource units of the blank pattern corresponds to port 2 and port 3, CDM group 0 corresponding to the resource units of the horizontal line image corresponds to port 8 and port 9, and CDM group 1 corresponding to the resource units of the dotted image corresponds to port 10 and port 11.

[0049] Taking CDM group 0 shown in Figure 3 as an example, the first subsequence [+1,+1] is mapped to port 0 of the DMRS as a basic unit, the second subsequence [+1,-1] is mapped to port 1 as a basic unit, the first subsequence [+1,+1] and the third subsequence [-1,-1] are mapped to port 8 as basic units, and the second subsequence [+1,-1] and the fourth subsequence [-1,+1] are mapped to port 9 as basic units. Here, on port 0, the first subsequence [+1,+1] is mapped to two adjacent subcarriers occupied by port 0, on port 1, the second subsequence [+1,-1] is mapped to two adjacent subcarriers occupied by port 1, on port 8, the first subsequence [+1,+1] and the third subsequence [-1,-1] are alternately mapped to two adjacent subcarriers occupied by port 8 in the form of the first mapping rule, and on port 9, the second subsequence [+1,-1] and the fourth subsequence [-1,+1] are alternately mapped to two adjacent subcarriers occupied by port 9 in the form of the first mapping rule. Two RBs are taken as an example in FIG. 3, which can be applied to any number of RBs.

[0050] In one embodiment, when the second length subsequence, i.e., a subsequence of length four, is taken as a subsequence of target length, the corresponding second mapping rule may be to sequentially map the fifth subsequence, the sixth subsequence, the seventh subsequence or the eighth subsequence as a basic unit onto subcarriers in a symbol occupied by a port.

[0051] As shown in Figure 3, taking CDM group 0 as an example, the fifth subsequence [+1, +1, +1, +1] is mapped to port 0 of the DMRS as a basic unit, the sixth subsequence [+1, -1, +1, -1] is mapped to port 1 as a basic unit, the seventh subsequence [+1, +1, -1, -1] is mapped to port 8 as a basic unit, and the eighth subsequence [+1, -1, -1, +1] is mapped to port 9 as a basic unit. Here, the above four subsequences of the second length are mapped to subcarriers 0, 2, 4, and 6 of RB0 in the form of a second mapping rule, and are mapped to subcarriers 8 and 10 of RB0 and subcarriers 12 and 14 of RB1, and at this time, are mapped to resource unit (Resource element, RE) resources occupied by the DMRS in a form spanning RBs, and are mapped to subcarriers 16, 18, 20, and 22 of RB1. In FIG. 3, two RBs are taken as an example, but it can be applied to any number of RBs.

[0052] It should be understood that when the number of RBs is odd, for example when the bandwidth occupied by a bandwidth part (BWP) is an odd number of RBs or the bandwidth occupied by a DMRS is an odd number of RBs, the first subsequence [+1,+1] and the second subsequence [+1,-1] are mapped onto two adjacent subcarriers with the highest indices corresponding to the same CDM group in the RB with the highest index, where the first subsequence [+1,+1] corresponds to the two elements before the fifth subsequence [+1,+1,+1,+1] and the seventh subsequence [+1,+1,-1,-1], and the second subsequence [+1,-1] corresponds to the two elements before the sixth subsequence [+1,-1,+1,-1] and the eighth subsequence [+1,-1,-1,+1].

[0053] In one embodiment, when the third length subsequence, i.e., a subsequence of length six, is taken as a target length subsequence, the corresponding second mapping rule may be to sequentially map the fifth subsequence, the sixth subsequence, the seventh subsequence or the eighth subsequence as a basic unit onto subcarriers in a symbol occupied by a port.

[0054] As shown in Figure 4, taking CDM group 0 as an example, the ninth subsequence [+1,+1,+1,+1,+1,+1] is mapped to port 0 of the DMRS as a basic unit, the tenth subsequence [+1,-1,+1,-1,+1,-1] is mapped to port 1 as a basic unit, the eleventh subsequence [+1,+1,-1,-1,+1,+1] is mapped to port 8 as a basic unit, and the twelfth subsequence [+1,-1,-1,+1,+1,-1] is mapped to port 9 as a basic unit. Here, the above four subsequences with a length of 6 are mapped on six subcarriers of RB0 and RB1 in the form of the third mapping rule, i.e., subcarriers 0, 2, 4, 6, 8, 10 of RB0 and subcarriers 12, 14, 16, 18, 20, 22 of RB1. In FIG. 3, two RBs are taken as an example, but it can be applied to any number of RBs.

[0055] As shown in FIG. 5, there is one DMRS pattern of a single symbol structure of the second configuration type, which includes three CDM groups, in which CDM group 0, CDM group 1 and CDM group 2 respectively correspond to resource units of different patterns, where CDM group 0 corresponding to resource units of the diagonal line image corresponds to port 0 and port 1, CDM group 1 corresponding to resource units of the blank pattern corresponds to port 2 and port 3, CDM group 2 corresponding to resource units of the vertical line pattern corresponds to port 4 and port 5, CDM group 0 corresponding to resource units of the horizontal line image corresponds to port 12 and port 13, CDM group 1 corresponding to resource units of the cross image corresponds to port 14 and port 15, and CDM group 2 corresponding to resource units of the dotted image corresponds to port 16 and port 17.

[0056] In one embodiment, taking CDM group 0 shown in Figure 5 as an example, the first subsequence [+1, +1] is mapped as a basic unit to port 0 of the DMRS, the second subsequence [+1, -1] is mapped as a basic unit to port 1, the first subsequence [+1, +1] and the third subsequence [-1, -1] are mapped as basic units to port 12, and the second subsequence [+1, -1] and the fourth subsequence [-1, +1] are mapped as basic units to port 13. Here, on port 0, the first subsequence [+1,+1] is mapped to two adjacent subcarriers occupied by port 0, on port 1, the second subsequence [+1,-1] is mapped to two adjacent subcarriers occupied by port 1, on port 12, the first subsequence [+1,+1] and the third subsequence [-1,-1] are alternately mapped to two adjacent subcarriers occupied by port 12 in the form of the first mapping rule, and on port 13, the second subsequence [+1,-1] and the fourth subsequence [-1,+1] are alternately mapped to two adjacent subcarriers occupied by port 13 in the form of the first mapping rule. One RB is taken as an example in FIG. 5, which can be applied to any number of RBs.

[0057] In one embodiment, taking CDM group 0 as an example, the fifth subsequence [+1,+1,+1,+1] is mapped to port 0 of the DMRS as a basic unit, the sixth subsequence [+1,-1,+1,-1] is mapped to port 1 as a basic unit, the seventh subsequence [+1,+1,-1,-1] is mapped to port 12 as a basic unit, and the eighth subsequence [+1,-1,-1,+1] is mapped to port 13 as a basic unit. Here, in CDM group 0, the above four subsequences of the second length are mapped to four adjacent subcarriers, i.e., subcarriers 0, 1, 6, and 7 of RB0 in the form of a second mapping rule, which takes one RB as an example in FIG. 5 and can be applied to any number of RBs.

[0058] In one embodiment, the frequency division cover code sequence is generated starting from the starting subcarrier of a Common Resource Block (CRB) numbered zero.

[0059] The starting subcarrier is associated with a CDM group, and in one embodiment, when the target DMRS is of a first configuration type, a frequency division cover code sequence corresponding to CDM group 0 is generated starting from the first subcarrier of a common resource block numbered 0, and a frequency division cover code sequence corresponding to CDM group 1 is generated starting from the second subcarrier of a common resource block numbered 0.

[0060] In another embodiment, when the target DMRS is of a second configuration type, a frequency division cover code sequence corresponding to CDM group 0 is generated starting from the first subcarrier of the common resource block numbered 0, a frequency division cover code sequence corresponding to CDM group 1 is generated starting from the third subcarrier of the common resource block numbered 0, and a frequency division cover code sequence corresponding to CDM group 2 is generated starting from the fifth subcarrier of the common resource block numbered 0.

[0061] In one embodiment, when the frequency division cover code sequence is generated using a subsequence of a first length or a subsequence of a second length as a basic unit, the target demodulation reference signal is a demodulation reference signal of a first configuration type or a second configuration type, where the first configuration type is associated with configuration type 1 of the demodulation reference signal and the second configuration type is associated with configuration type 2 of the demodulation reference signal.

[0062] In another embodiment, when the frequency division cover code sequence is generated using a subsequence of a third length as a basic unit, the target demodulation reference signal is of a first configuration type, where the first configuration type is associated with configuration type 1 of the demodulation reference signal.

[0063] Based on the subsequences of lengths 2, 4, and 6 according to the embodiments of the present application, for a single-symbol DMRS, at most 8 ports can be supported for the first configuration type, and at most 12 ports can be supported for the second configuration type, and for a dual-symbol DMRS, at most 16 ports can be supported for the first configuration type, and at most 24 ports can be supported for the second configuration type, which is a factor of one increase over the number of ports supported by a traditional DMRS.

[0064] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application design subsequences of various lengths, and map the subsequences of a target length to ports as basic units to generate frequency division cover code sequences, and then generate a target DMRS, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0065] Based on the above embodiment, when the first communication device is a terminal and the second communication device is a network side device, the method further comprises: The terminal further includes receiving despreading instruction information from the network side equipment, the despreading instruction information being used to indicate corresponding despreading window information when the terminal performs channel estimation of the target demodulation reference signal, and the despreading window information including a despreading window length.

[0066] The despreading window length may be various, and in the embodiments of the present application, the despreading window length is only illustrated as 2 or 4 as an example.

[0067] In one embodiment, step S220 includes: The terminal performs channel estimation for the target demodulation reference signal based on the despreading window length.

[0068] In one embodiment, when the despreading window length is 2, for ports belonging to the same code division multiplexing group in the target demodulation reference signal, the terminal performs joint channel estimation using two adjacent subcarriers occupied by the port in a symbol as a despreading window.

[0069] In another embodiment, when the despreading window length is 4, for ports belonging to the same code division multiplexing group in the target demodulation reference signal, the terminal performs joint channel estimation using four adjacent subcarriers occupied by the port in a symbol as a despreading window.

[0070] As shown in Figure 6, when there is one DMRS pattern of a single symbol structure of the first configuration type and the despreading window length is 4, the DMRS channel estimation method of the terminal is shown in Figure 6. Taking channel estimation in CDM group 0 as an example, joint channel estimation is performed once based on four adjacent subcarriers in despreading window 1, and joint channel estimation is performed once based on four adjacent subcarriers in despreading window 2, that is, channel estimation is performed based on two despreading windows in one RB.

[0071] As shown in Figure 7, when the DMRS pattern has a single symbol structure of the second configuration type and the despreading window length is 4, the DMRS channel estimation method of the terminal device is as shown in Figure 6. Taking channel estimation in CDM group 0 as an example, joint channel estimation is performed once in despreading window 1 based on four adjacent subcarriers corresponding to CDM group 0.

[0072] Because the frequency division cover codes in the despreading window are orthogonal to each other, the four DMRS ports belonging to the same CDM group are orthogonal to each other to ensure the channel estimation performance.

[0073] As can be seen, by using frequency division cover codes generated using subsequences of a target length as basic units, code division multiplexing can be realized between more DMRS ports, such that one CDM group contains more mutually orthogonal DMRS ports.

[0074] In one embodiment, before the terminal receives despreading instruction information from the network side equipment, the method includes: The method further includes the terminal reporting the channel estimation capability of the terminal to the network side device.

[0075] In one embodiment, the channel estimation capability is used to indicate whether the terminal supports channel estimation of a demodulation reference signal based on a despreading window length of four.

[0076] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application make the channel estimation of the target DMRS more accurate by sending despreading instruction information to the terminal, allowing the terminal to perform channel estimation for the DMRS based on the despreading window length.

[0077] In one embodiment, when the first communication device is a terminal and the second communication device is a network side device, before the terminal receives a target demodulation reference signal from the network side device, the method includes: The method further includes the terminal reporting to the network side device downlink data reception capabilities supported by the terminal, the downlink data reception capabilities including capabilities of RB number types of a Physical Downlink Shared Channel (PDSCH) supported by the terminal.

[0078] In one embodiment, the PDSCH RB number type is: The number of RBs of the PDSCH is an even number; and the number of RBs of the PDSCH is odd or even, i.e., there is no restriction on the oddness or evenness of the number of RBs of the PDSCH.

[0079] In one embodiment, the terminal receives target configuration information from the network side device, the target configuration information corresponding to a downlink data reception capability reported by the terminal, and the target configuration information is used to indicate the number and type of RBs of a PDSCH to be received by the terminal.

[0080] For example, when the terminal reports that the number of RBs of a PDSCH that can be supported by it is even, the network side device may transmit target configuration information to indicate that the number of RBs of a PDSCH to be subsequently transmitted by the terminal is all even, and at this time, the terminal may adopt a corresponding channel estimation method to demodulate the PDSCH. Alternatively, when the terminal reports that the number of RBs of a PDSCH supported by it may be odd or even, the network side device may transmit target configuration information to indicate that the number of RBs of a PDSCH to be subsequently transmitted by the terminal is all even or is not limited (i.e., the number of RBs may be even or odd), and at this time, the terminal may adopt a corresponding channel estimation method based on the target configuration information to demodulate the PDSCH.

[0081] When the number of RBs in the PDSCH is odd, the terminal can perform channel estimation based on two despreading windows in one RB, thereby solving the channel estimation problem when the number of RBs in the PDSCH is odd. That is, if the terminal supports performing channel estimation based on two despreading windows in one RB, the terminal can support the PDSCH received thereby having an odd number of RBs. It should be noted that performing channel estimation based on two despreading windows in one RB is just one method for the terminal to perform channel estimation, and does not exclude other channel estimation methods that can enable the terminal to support reception of a PDSCH with an odd number of RBs.

[0082] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application improve the performance of channel estimation by determining the number and type of RBs of PDSCH according to the downlink data reception capability reported by the terminal.

[0083] For the demodulation reference signal transmission method according to the embodiment of the present application, the execution body can be a demodulation reference signal transmission device. In the embodiment of the present application, the demodulation reference signal transmission device executes the demodulation reference signal transmission method as an example, and the demodulation reference signal transmission device according to the embodiment of the present application is described.

[0084] As shown in FIG. 8, the demodulation reference signal transmission device includes: a transceiver module 701 and a calculation module 702.

[0085] The transceiver module 701 is used for receiving a target demodulation reference signal from a second communication device, and the calculation module 702 is used for performing channel estimation on the target demodulation reference signal, where the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a target length subsequence as a basic unit and according to a resource mapping rule corresponding to the target length subsequence, the frequency division cover code sequence is used for code division multiplexing of ports of the target demodulation reference signal, and N is a positive integer.

[0086] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application use a subsequence of a target length as a basic unit, and generate N frequency division cover code sequences according to a resource mapping rule corresponding to the subsequence of the target length, and use the N frequency division cover code sequences to generate and transmit a target demodulation reference signal for channel estimation, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0087] Based on the above embodiment, further, the target length subsequence may include: a subsequence of a first length; a subsequence of a second length; and a subsequence of a third length, Here, the first length is 2, the second length is 4, and the third length is 6.

[0088] Furthermore, the frequency division cover code sequence is Taking a subsequence of a first length as a basic unit, mapping the subsequence of the first length to two subcarriers in a symbol occupied by the port in the form of a first mapping rule, and the two subcarriers belong to the same RB; Taking a subsequence of a second length as a basic unit, mapping the subsequence of the second length to four subcarriers in a symbol occupied by the port in the form of a second mapping rule, and the four subcarriers belong to the same RB or two RBs; a subsequence of a third length is generated as a basic unit, and the subsequence of the third length is mapped to six subcarriers in a symbol occupied by the port in the form of a third mapping rule, and the six subcarriers belong to the same RB.

[0089] Further, the first length subsequence comprises: A first subsequence, [+1,+1], A second subsequence, [+1,-1], A third subsequence, [-1,-1], and the fourth subsequence [-1, +1].

[0090] Furthermore, the second length subsequence is A fifth subsequence, [+1,+1,+1,+1]; A sixth subsequence, [+1,-1,+1,-1]; The seventh subsequence [+1,+1,-1,-1]; and the eighth subsequence [+1, -1, -1, +1].

[0091] Furthermore, the third length subsequence is The ninth subsequence, [+1,+1,+1,+1,+1,+1], the tenth subsequence [+1,-1,+1,-1,+1,-1]; an eleventh subsequence, [+1,+1,-1,-1,+1,+1]; and a twelfth subsequence [+1, -1, -1, +1, +1, -1].

[0092] Furthermore, when generating the frequency division cover code sequence using the first subsequence and the third subsequence as basic units, the first mapping rule is to alternately map the first subsequence and the third subsequence to subcarriers in a symbol occupied by a port.

[0093] Furthermore, when generating the frequency division cover code sequence using the second subsequence and the fourth subsequence as basic units, the first mapping rule is to alternately map the second subsequence and the fourth subsequence to subcarriers in symbols occupied by a port.

[0094] Furthermore, the frequency division cover code sequence is generated starting from the starting subcarrier of a common resource block numbered 0.

[0095] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a first length or a subsequence of a second length as a basic unit, the target demodulation reference signal is a demodulation reference signal of a first configuration type or a second configuration type, where the first configuration type is associated with configuration type 1 of a demodulation reference signal, and the second configuration type is associated with configuration type 2 of a demodulation reference signal.

[0096] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a third length as a basic unit, the target demodulation reference signal is of a first configuration type, where the first configuration type is associated with configuration type 1 of the demodulation reference signal.

[0097] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application design subsequences of various lengths, and map the subsequences of a target length to ports as basic units to generate frequency division cover code sequences, and then generate a target DMRS, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0098] Based on the above embodiment, when the first communication device is a terminal and the second communication device is a network side device, the transceiver module 701 further comprises: It is used to receive despreading instruction information from the network side equipment, and the despreading instruction information is used to indicate corresponding despreading window information when the terminal performs channel estimation of the target demodulation reference signal, and the despreading window information includes a despreading window length.

[0099] Further, the calculation module 702 is used to perform channel estimation for the target demodulation reference signal based on the despreading window length.

[0100] Furthermore, the despreading window length is two or four.

[0101] Furthermore, the calculation module 702 When the despreading window length is 2, for ports belonging to the same code division multiplexing group in the target demodulation reference signal, performing joint channel estimation using two adjacent subcarriers occupied by the ports in a symbol as a despreading window; When the despreading window length is 4, it is used to perform at least one of the following: for ports belonging to the same code division multiplexing group in the target demodulation reference signal, performing joint channel estimation using four adjacent subcarriers occupied by the port in a symbol as a despreading window.

[0102] In addition, before receiving the despreading indication information from the network side equipment, the transceiver module 701 is further used for reporting the channel estimation capability of the terminal to the network side equipment.

[0103] Furthermore, the channel estimation capability is used to indicate whether the terminal supports performing channel estimation of a demodulation reference signal based on a despreading window length of four.

[0104] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application make the channel estimation of the target DMRS more accurate by sending despreading instruction information to the terminal, allowing the terminal to perform channel estimation for the DMRS based on the despreading window length.

[0105] Based on the above embodiment, further, when the first communication device is a terminal and the second communication device is a network side device, before receiving a target demodulation reference signal from the network side device, the transceiver module 701 is further used to report to the network side device a downlink data receiving capability supported by the terminal, where the downlink data receiving capability includes a capability of the RB number type of PDSCH supported by the terminal.

[0106] Furthermore, the RB number type of the PDSCH is The number of RBs of the PDSCH is an even number; and The number of RBs of the PDSCH is an odd number or an even number.

[0107] Furthermore, the transceiver module 701 is further used for receiving target configuration information from the network side equipment, the target configuration information corresponds to a downlink data receiving capability reported by the terminal, and the target configuration information is used to indicate the RB number type of the PDSCH received by the terminal.

[0108] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application improve the performance of channel estimation by determining the number and type of RBs of PDSCH according to the downlink data reception capability reported by the terminal.

[0109] The demodulation reference signal transmission device in the embodiment of the present application may be an electronic device, for example, an electronic device having an operating system, or may be a component in an electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than a terminal. Exemplarily, the terminal may include, but is not limited to, the types of terminal 11 listed above, and the other devices may be servers, network attached storage (NAS), etc., and the embodiment of the present application is not specifically limited.

[0110] The demodulation reference signal transmission device according to the embodiment of the present application can realize each process realized by the embodiment of the method of Figures 2 to 7, and achieve the same technical effects, and will not be further described here to avoid repetition of description.

[0111] As shown in Figure 9, an embodiment of the present application provides a demodulation reference signal transmission method, and the execution body of this method is a second communication device, and the second communication device can be a network side device or a terminal, in other words, the method can be executed by software or hardware installed in the second communication device. The method includes the following steps:

[0112] S810, a second communication device generates N frequency division cover code sequences according to a resource mapping rule corresponding to the target length subsequence as a basic unit, and the frequency division cover code sequence is used for code division multiplexing of a port of a demodulation reference signal of a target demodulation reference signal; S820, the second communication device generates a target demodulation reference signal according to the N frequency division cover code sequences and sends it to the first communication device; Here, N is a positive integer.

[0113] Steps S810-S820 realize the embodiment of the method shown in FIG. 2, and can obtain the same technical effects, and the repeated parts will not be further described here.

[0114] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application use a subsequence of a target length as a basic unit, and generate N frequency division cover code sequences according to a resource mapping rule corresponding to the subsequence of the target length, and use the N frequency division cover code sequences to generate and transmit a target demodulation reference signal for channel estimation, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0115] Based on the above embodiment, further, the target length subsequence may include: a subsequence of a first length; a subsequence of a second length; and a subsequence of a third length, Here, the first length is 2, the second length is 4, and the third length is 6.

[0116] Further, step S810 Taking a subsequence of a first length as a basic unit, mapping the subsequence of the first length to two subcarriers in a symbol occupied by the port in the form of a first mapping rule, and the two subcarriers belong to the same RB; Taking a subsequence of a second length as a basic unit, mapping the subsequence of the second length to four subcarriers in a symbol occupied by the port in the form of a second mapping rule, and the four subcarriers belong to the same RB or two RBs; generating a subsequence of a third length as a basic unit, and mapping the subsequence of the third length to six subcarriers in a symbol occupied by the port in the form of a third mapping rule, wherein the six subcarriers belong to the same RB.

[0117] Further, the first length subsequence comprises: A first subsequence, [+1,+1], A second subsequence, [+1,-1], A third subsequence, [-1,-1], and the fourth subsequence [-1, +1].

[0118] Furthermore, the second length subsequence is A fifth subsequence, [+1,+1,+1,+1]; A sixth subsequence, [+1,-1,+1,-1]; The seventh subsequence [+1,+1,-1,-1]; and the eighth subsequence [+1, -1, -1, +1].

[0119] Furthermore, the third length subsequence is The ninth subsequence, [+1,+1,+1,+1,+1,+1], the tenth subsequence [+1,-1,+1,-1,+1,-1]; an eleventh subsequence, [+1,+1,-1,-1,+1,+1]; and a twelfth subsequence [+1, -1, -1, +1, +1, -1].

[0120] Furthermore, when generating a frequency division cover code sequence using the first subsequence and the third subsequence as a basic unit, the first mapping rule is to alternately map the first subsequence and the third subsequence to subcarriers in a symbol occupied by a port.

[0121] Furthermore, when generating a frequency division cover code sequence using the second subsequence and the fourth subsequence as a basic unit, the first mapping rule is to alternately map the second subsequence and the fourth subsequence to subcarriers in a symbol occupied by a port.

[0122] Furthermore, the frequency division cover code sequence is generated starting from the starting subcarrier of a common resource block numbered 0.

[0123] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a first length or a subsequence of a second length as a basic unit, the target demodulation reference signal is a demodulation reference signal of a first configuration type or a second configuration type, where the first configuration type is associated with configuration type 1 of a demodulation reference signal, and the second configuration type is associated with configuration type 2 of a demodulation reference signal.

[0124] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a third length as a basic unit, the demodulation reference signal is of a first configuration type, where the first configuration type is associated with configuration type 1 of the demodulation reference signal.

[0125] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application design subsequences of various lengths, and map the subsequences of a target length to ports as basic units to generate frequency division cover code sequences, and then generate a target DMRS, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0126] Based on the above embodiment, when the first communication device is a terminal and the second communication device is a network side device, the method further comprises: The network side equipment further includes transmitting despreading instruction information to the terminal, the despreading instruction information being used to indicate corresponding despreading window information when the terminal performs channel estimation of the target demodulation reference signal, and the despreading window information including a despreading window length.

[0127] Furthermore, the despreading window length is two or four.

[0128] Furthermore, before the network side device transmits despreading instruction information to the terminal, the method further comprises: The method further includes the network side device receiving, from the terminal, a channel estimation capability of the terminal.

[0129] Furthermore, the channel estimation capability is used to indicate whether the terminal supports performing channel estimation of a demodulation reference signal based on a despreading window length of four.

[0130] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application make the channel estimation of the target DMRS more accurate by sending despreading instruction information to the terminal, allowing the terminal to perform channel estimation for the DMRS based on the despreading window length.

[0131] Based on the above embodiment, when the first communication device is a terminal and the second communication device is a network side device, before the network side device transmits a target demodulation reference signal to the terminal, the method further comprises: The method further includes the network side device receiving from the terminal a downlink data reception capability supported by the terminal, the downlink data reception capability including a capability of a number of RB types of a PDSCH supported by the terminal.

[0132] Furthermore, the RB number type of the PDSCH is The number of RBs of the PDSCH is an even number; and The number of RBs of the PDSCH is an odd number or an even number.

[0133] Further, the network side equipment transmits target configuration information to the terminal, the target configuration information corresponding to a downlink data reception capability supported by the terminal which the network side equipment receives from the terminal, and the target configuration information is used to indicate an RB number type of a PDSCH to be received by the terminal.

[0134] For the demodulation reference signal transmission method according to the embodiment of the present application, the execution body can be a demodulation reference signal transmission device. In the embodiment of the present application, the demodulation reference signal transmission device executes the demodulation reference signal transmission method as an example, and the demodulation reference signal transmission device according to the embodiment of the present application is described.

[0135] As shown in FIG. 10, the demodulation reference signal transmission device includes: a generating module 901 and a transmitting module 902.

[0136] The generating module 901 is used to generate N frequency division cover code sequences with a target length subsequence as a basic unit and a resource mapping rule corresponding to the target length subsequence, and the frequency division cover code sequence is used for code division multiplexing of a demodulation reference signal port of a target demodulation reference signal, and the transmitting module 902 is used to generate and send a target demodulation reference signal to a first communication device based on the N frequency division cover code sequences, where N is a positive integer.

[0137] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application use a subsequence of a target length as a basic unit, and generate N frequency division cover code sequences according to a resource mapping rule corresponding to the subsequence of the target length, and use the N frequency division cover code sequences to generate and transmit a target demodulation reference signal for channel estimation, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0138] Based on the above embodiment, further, the target length subsequence may include: a subsequence of a first length; a subsequence of a second length; and a subsequence of a third length, Here, the first length is 2, the second length is 4, and the third length is 6.

[0139] Furthermore, the generation module 901 Taking a subsequence of a first length as a basic unit, mapping the subsequence of the first length to two subcarriers in a symbol occupied by the port in the form of a first mapping rule, and the two subcarriers belong to the same RB; Taking a subsequence of a second length as a basic unit, mapping the subsequence of the second length to four subcarriers in a symbol occupied by the port in the form of a second mapping rule, and the four subcarriers belong to the same RB or two RBs; The port is used to implement one of the following schemes: generate a subsequence of a third length as a basic unit, map the subsequence of the third length to six subcarriers in a symbol occupied by the port in the form of a third mapping rule, and the six subcarriers belong to the same RB.

[0140] Further, the first length subsequence comprises: A first subsequence, [+1,+1], A second subsequence, [+1,-1], A third subsequence, [-1,-1], and the fourth subsequence [-1, +1].

[0141] Furthermore, the second length subsequence is A fifth subsequence, [+1,+1,+1,+1]; A sixth subsequence, [+1,-1,+1,-1]; The seventh subsequence [+1,+1,-1,-1]; and the eighth subsequence [+1, -1, -1, +1].

[0142] Furthermore, the third length subsequence is The ninth subsequence, [+1,+1,+1,+1,+1,+1], the tenth subsequence [+1,-1,+1,-1,+1,-1]; an eleventh subsequence, [+1,+1,-1,-1,+1,+1]; and a twelfth subsequence [+1, -1, -1, +1, +1, -1].

[0143] Furthermore, when generating a frequency division cover code sequence using the first subsequence and the third subsequence as a basic unit, the first mapping rule is to alternately map the first subsequence and the third subsequence to subcarriers in a symbol occupied by a port.

[0144] Furthermore, when generating a frequency division cover code sequence using the second subsequence and the fourth subsequence as a basic unit, the first mapping rule is to alternately map the second subsequence and the fourth subsequence to subcarriers in a symbol occupied by a port.

[0145] Furthermore, the frequency division cover code sequence is generated starting from the starting subcarrier of a common resource block numbered 0.

[0146] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a first length or a subsequence of a second length as a basic unit, the target demodulation reference signal is a demodulation reference signal of a first configuration type or a second configuration type, where the first configuration type is associated with configuration type 1 of a demodulation reference signal, and the second configuration type is associated with configuration type 2 of a demodulation reference signal.

[0147] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a third length as a basic unit, the demodulation reference signal is of a first configuration type, where the first configuration type is associated with configuration type 1 of the demodulation reference signal.

[0148] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application design subsequences of various lengths, and map the subsequences of a target length to ports as basic units to generate frequency division cover code sequences, and then generate a target DMRS, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0149] Based on the above embodiment, further, when the first communication device is a terminal and the second communication device is a network side device, the transmission module 902 is further used to send despreading instruction information to the terminal, the despreading instruction information is used to indicate corresponding despreading window information when the terminal performs channel estimation of the target demodulation reference signal, and the despreading window information includes a despreading window length.

[0150] Furthermore, the despreading window length is two or four.

[0151] In addition, the transmitting module 902 is further used for receiving the channel estimation capability of the terminal from the terminal.

[0152] Furthermore, the channel estimation capability is used to indicate whether the terminal supports performing channel estimation of a demodulation reference signal based on a despreading window length of four.

[0153] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application make the channel estimation of the target DMRS more accurate by sending despreading instruction information to the terminal, allowing the terminal to perform channel estimation for the DMRS based on the despreading window length.

[0154] Based on the above embodiment, further, when the first communication device is a terminal and the second communication device is a network side device, the transmitting module 902 is further used for receiving from the terminal a downlink data receiving capability supported by the terminal, where the downlink data receiving capability includes a capability of RB number type of the physical downlink shared channel (PDSCH) supported by the terminal.

[0155] Furthermore, the RB number type of the PDSCH is The number of RBs of the PDSCH is an even number; and The number of RBs of the PDSCH is an odd number or an even number.

[0156] Furthermore, the transmission module 902 is further used for sending target configuration information to the terminal, the target configuration information corresponding to the downlink data receiving capability supported by the terminal which the network side equipment receives from the terminal, and the target configuration information is used to indicate the RB number type of the PDSCH to be received by the terminal.

[0157] The demodulation reference signal transmission device in the embodiment of the present application may be an electronic device, for example, an electronic device having an operating system, or may be a component in an electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than a terminal. Exemplarily, the terminal may include, but is not limited to, the types of terminal 11 listed above, and the other devices may be servers, network attached storage (NAS), etc., and the embodiment of the present application is not specifically limited.

[0158] The demodulation reference signal transmission device according to the embodiment of the present application can realize each process realized by the embodiment of the method of Figure 9 and achieve the same technical effect, and will not be described further here in order to avoid repetition of description.

[0159] Optionally, as shown in Fig. 11, the embodiment of the present application further provides a communication device 1000, which includes a processor 1001 and a memory 1002, and the memory 1002 stores a program or instruction that can run on the processor 1001, for example, when the communication device 1000 is a terminal, the program or instruction can be executed by the processor 1001 to realize each step of the embodiment of the demodulation reference signal transmission method and achieve the same technical effect. When the communication device 1000 is a network side device, the program or instruction can be executed by the processor 1001 to realize each step of the embodiment of the demodulation reference signal transmission method and achieve the same technical effect, and in order to avoid repetition, no further description will be given here.

[0160] The embodiment of the present application further provides a terminal, which includes a processor and a communication interface, the processor is used for performing channel estimation for the target demodulation reference signal, and the communication interface is used for receiving the target demodulation reference signal from a second communication device. The embodiment of the terminal corresponds to the embodiment of the method on the terminal side, and each implementation process and realization manner of the embodiment of the method can be applied to the embodiment of the terminal, and can achieve the same technical effect. Specifically, FIG. 12 is a schematic diagram of the hardware structure for realizing the terminal of the embodiment of the present application.

[0161] The terminal 1100 includes at least some of the following components, but is not limited to: a radio frequency unit 1101, a network module 1102, an audio output unit 1103, an input unit 1104, a sensor 1105, a display unit 1106, a user input unit 1107, an interface unit 1108, a memory 1109, and a processor 1110.

[0162] As can be understood by those skilled in the art, the terminal 1100 may further include a power source (e.g., a battery) for powering each component, and the power source may be logically connected to the processor 1110 by a power management system, so that the power management system can realize functions such as charge / discharge management and power consumption management. The terminal structure shown in FIG. 12 does not constitute a limitation on the terminal, and the terminal may include more or less components than the number of components shown, or a combination of some components, or a different arrangement of components, and will not be further described here.

[0163] It should be understood that in the embodiment of the present application, the input unit 1104 may include a graphics processing unit (GPU) 11041 and a microphone 11042, and the GPU 11041 processes image data of still or video captured by an image capture device (e.g., a camera) in a video capture mode or an image capture mode. The display unit 1106 may include a display panel 11061, and the display panel 11061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1107 includes at least one of a touch panel 11071 and other input devices 11072. The touch panel 11071 is also called a touch screen. The touch panel 11071 may include two parts: a touch detection device and a touch controller. The other input devices 11072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control buttons, switch buttons, etc.), a trackball, a mouse, and an operation lever, which will not be described further herein.

[0164] In the embodiment of the present application, the radio frequency unit 1101 can receive downlink data from the network side device, and then transmit the data to the processor 1110 for processing, and can transmit uplink data to the network side device. In general, the radio frequency unit 1101 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0165] The memory 1109 may be used to store software programs or instructions and various data. The memory 1109 may include a first storage area that mainly stores programs or instructions and a second storage area that stores data, where the first storage area can store an operating system, application programs or instructions required for at least one function (e.g., audio playback function, image playback function, etc.), etc. The memory 1109 may include a volatile memory or a non-volatile memory, or the memory 1109 may include both volatile and non-volatile memory. Here, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be Random Access Memory (RAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Synch link Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM). Memory 1109 in embodiments of the present application may include, but is not limited to, these and any other suitable types of memory.

[0166] The processor 1110 may include one or more processing units. Optionally, the processor 1110 integrates an application processor and a modem processor, where the application processor mainly processes operations related to the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication signals, e.g., a baseband processor. As can be understood, the modem processor may not be integrated into the processor 1110.

[0167] Wherein, the radio frequency unit 1101 is used for receiving a target demodulation reference signal from a second communication device; A processor 1110 is configured to perform channel estimation on the target demodulation reference signal; Here, the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a subsequence of a target length as a basic unit and according to a resource mapping rule corresponding to the subsequence of the target length, the frequency division cover code sequence is used for code division multiplexing of ports of the target demodulation reference signal, and N is a positive integer.

[0168] As can be seen from the technical solutions of the above embodiments, the embodiments of the present application use a subsequence of a target length as a basic unit, and generate N frequency division cover code sequences according to a resource mapping rule corresponding to the subsequence of the target length, and use the N frequency division cover code sequences to generate and transmit a target demodulation reference signal for channel estimation, so that the target DMRS can support more ports and increase the data traffic of transmission.

[0169] Based on the above embodiment, further, the target length subsequence may include: a subsequence of a first length; a subsequence of a second length; and a subsequence of a third length, Here, the first length is 2, the second length is 4, and the third length is 6.

[0170] Furthermore, the frequency division cover code sequence is Taking a subsequence of a first length as a basic unit, mapping the subsequence of the first length to two subcarriers in a symbol occupied by the port in the form of a first mapping rule, and the two subcarriers belong to the same RB; Taking a subsequence of a second length as a basic unit, mapping the subsequence of the second length to four subcarriers in a symbol occupied by the port in the form of a second mapping rule, and the four subcarriers belong to the same RB or two RBs; a subsequence of a third length is generated as a basic unit, and the subsequence of the third length is mapped to six subcarriers in a symbol occupied by the port in the form of a third mapping rule, and the six subcarriers belong to the same RB.

[0171] Further, the first length subsequence comprises: A first subsequence, [+1,+1], A second subsequence, [+1,-1], A third subsequence, [-1,-1], and the fourth subsequence [-1, +1].

[0172] Furthermore, the second length subsequence is A fifth subsequence, [+1,+1,+1,+1]; A sixth subsequence, [+1,-1,+1,-1]; The seventh subsequence [+1,+1,-1,-1]; and the eighth subsequence [+1, -1, -1, +1].

[0173] Furthermore, the third length subsequence is The ninth subsequence, [+1,+1,+1,+1,+1,+1], the tenth subsequence [+1,-1,+1,-1,+1,-1]; an eleventh subsequence, [+1,+1,-1,-1,+1,+1]; and a twelfth subsequence [+1, -1, -1, +1, +1, -1].

[0174] Furthermore, when generating the frequency division cover code sequence using the first subsequence and the third subsequence as basic units, the first mapping rule is to alternately map the first subsequence and the third subsequence to subcarriers in a symbol occupied by a port.

[0175] Furthermore, when generating the frequency division cover code sequence using the second subsequence and the fourth subsequence as basic units, the first mapping rule is to alternately map the second subsequence and the fourth subsequence to subcarriers in symbols occupied by a port.

[0176] Furthermore, the frequency division cover code sequence is generated starting from the starting subcarrier of a common resource block numbered 0.

[0177] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a first length or a subsequence of a second length as a basic unit, the target demodulation reference signal is a demodulation reference signal of a first configuration type or a second configuration type, where the first configuration type is associated with configuration type 1 of a demodulation reference signal, and the second configuration type is associated with configuration type 2 of a demodulation reference signal.

[0178] Furthermore, when the frequency division cover code sequence is generated using a subsequence of a third length as a basic unit, the target demodulation reference signal is of a first configuration type, where the first configuration type is associated with configuration type 1 of the demodulation reference signal.

[0179] According to the embodiment of the present application, the target DMRS can support more ports and increase the data traffic for transmission.

[0180] Based on the above embodiment, when the first communication device is a terminal and the second communication device is a network side device, the radio frequency unit 1101 further comprises: It is used to receive despreading instruction information from the network side equipment, and the despreading instruction information is used to indicate corresponding despreading window information when the terminal performs channel estimation of the target demodulation reference signal, and the despreading window information includes a despreading window length.

[0181] Further, processor 1110 is used to perform channel estimation for the target demodulation reference signal based on the despreading window length.

[0182] Furthermore, the despreading window length is two or four.

[0183] Further, the processor 1110 When the despreading window length is 2, for ports belonging to the same code division multiplexing group in the target demodulation reference signal, performing joint channel estimation using two adjacent subcarriers occupied by the ports in a symbol as a despreading window; When the despreading window length is 4, it is used to perform at least one of the following: for ports belonging to the same code division multiplexing group in the target demodulation reference signal, performing joint channel estimation using four adjacent subcarriers occupied by the port in a symbol as a despreading window.

[0184] In addition, before the terminal receives despreading indication information from the network side equipment, the radio frequency unit 1101 is further used to report the channel estimation capability of the terminal to the network side equipment.

[0185] Furthermore, the channel estimation capability is used to indicate whether the terminal supports performing channel estimation of a demodulation reference signal based on a despreading window length of four.

[0186] Based on the above embodiment, further, when the first communication device is a terminal and the second communication device is a network side device, before the terminal receives a target demodulation reference signal from the network side device, the radio frequency unit 1101 is further used to report to the network side device a downlink data receiving capability supported by the terminal, where the downlink data receiving capability includes a capability of the RB number type of the physical downlink shared channel (PDSCH) supported by the terminal.

[0187] Furthermore, the RB number type of the PDSCH is The number of RBs of the PDSCH is an even number; and The number of RBs of the PDSCH is an odd number or an even number.

[0188] Furthermore, the radio frequency unit 1101 is further used to receive target configuration information from the network side equipment, the target configuration information corresponds to a downlink data receiving capability reported by the terminal, and the target configuration information is used to indicate the RB number type of the PDSCH to be received by the terminal.

[0189] The embodiment of the present application makes the channel estimation of the target DMRS more accurate.

[0190] The embodiment of the present application further provides a network side device, which includes a processor and a communication interface, the processor is used to generate N frequency division cover code sequences with a target length subsequence as a basic unit and a resource mapping rule corresponding to the target length subsequence, the frequency division cover code sequence is used for code division multiplexing of a demodulation reference signal port of a target demodulation reference signal, and the communication interface is used to generate a target demodulation reference signal according to the N frequency division cover code sequences and send it to a first communication device. This embodiment of the network side device corresponds to the embodiment of the method of the above-mentioned network side device, and each implementation process and realization manner of the above-mentioned method embodiment can be applied to this embodiment of the network side device, and the same technical effects can be achieved.

[0191] Specifically, an embodiment of the present application further provides a network side device. As shown in Fig. 13, the network side device 1200 includes an antenna 121, a radio frequency device 122, a baseband device 123, a processor 124 and a memory 125. The antenna 121 and the radio frequency device 122 are connected. In the uplink direction, the radio frequency device 122 receives information through the antenna 121, and transmits the received information to the baseband device 123 for processing. In the downlink direction, the baseband device 123 processes the information to be transmitted and transmits it to the radio frequency device 122, and the radio frequency device 122 transmits the received information through the antenna 121 after processing it.

[0192] The methods performed by the network side equipment in the above embodiments may be implemented in the baseband device 123, which includes a baseband processor.

[0193] The baseband device 123 may include, for example, at least one baseband board, on which multiple chips are installed, and as shown in FIG. 13, one of the chips is, for example, a baseband processor, which is connected to the memory 125 via a bus interface, calls the program in the memory 125, and performs the network equipment operations shown in the above method embodiments.

[0194] The network side equipment may further include a network interface 126, which may be, for example, a common public radio interface (CPRI).

[0195] Specifically, the network side device 1200 of the embodiment of the present invention further includes instructions or programs stored in the memory 125 and operable on the processor 124, and the processor 124 calls the instructions or programs in the memory 125 to execute the method performed by each module shown in FIG. 7, and achieves the same technical effect, which will not be described further here in order to avoid repetition.

[0196] An embodiment of the present application further provides a readable storage medium, in which a program or instruction is stored, and when the program or instruction is executed by a processor, each process of the embodiment of the demodulation reference signal transmission method can be realized and the same technical effect can be achieved, and in order to avoid repetition of description, no further description will be given here.

[0197] Wherein, the processor is the processor in the terminal according to the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read only memory ROM, a random access memory RAM, a magnetic disk, or an optical disk.

[0198] An embodiment of the present application further provides a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run a program or instruction to realize each process of the embodiment of the demodulation reference signal transmission method described above, and the same technical effect can be achieved, and in order to avoid repetition of description, no further description will be given here.

[0199] It should be understood that the chips referred to in the embodiments of the present application may be referred to as system level chips, system chips, chip systems, or systems on chips.

[0200] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium, and which is executed by at least one processor to realize each process of the embodiment of the demodulation reference signal transmission method and achieve the same technical effects, and will not be described further here in order to avoid repetition of description.

[0201] An embodiment of the present application further provides a demodulation reference signal transmission system, the system including a terminal and a network side equipment, the terminal may be used to perform steps of the demodulation reference signal transmission method described above, and the network side equipment may be used to perform steps of the demodulation reference signal transmission method described above.

[0202] It should be explained that in this specification, the terms "comprise", "include", or any other variants thereof are intended to cover the non-exclusive "comprise", whereby a process, method, article, or apparatus that includes a set of elements includes not only those elements, but also other elements not expressly listed or inherent to such process, method, article, or apparatus. In the absence of further limitations, an element limited by the phrase "comprises a" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes this element. It should be pointed out that the scope of the method and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may include performing functions in an essentially simultaneous manner or in reverse order based on the functions involved, for example, the described method can be performed in a different order than described, and various steps can be added, omitted, or combined. Also, features described with reference to some examples can be combined in other examples.

[0203] From the above description of the embodiments, it is clear to those skilled in the art that the methods of the above embodiments can be realized in the form of software and a necessary general-purpose hardware platform. Of course, they can also be realized in hardware, but in many cases the former is a more preferred embodiment. In light of this understanding, the technical proposal of the present application may be substantially or the part that contributes to the prior art may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes some instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0204] The above describes the embodiments of the present application in conjunction with the drawings, but the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not limiting. Those skilled in the art can take the suggestions of this application and make many forms without departing from the spirit and scope of the claims of this application, all of which belong to the protection scope of this application.

[0205] CROSS-REFERENCE TO RELATED APPLICATIONS The present invention claims priority to a Chinese patent application proposed at the China Patent Office on April 2, 2022, with application number 202210346947.2, and titled "Demodulation reference signal transmission method, apparatus, terminal and network side equipment", and a Chinese patent application proposed at the China Patent Office on September 9, 2022, with application number 202211103762.5, and titled "Demodulation reference signal transmission method, apparatus, terminal and network side equipment", the entire contents of which are incorporated herein by reference.

Claims

1. A demodulation reference signal transmission method, comprising: receiving a target demodulation reference signal from a second communication device by a first communication device; performing channel estimation on the target demodulation reference signal by the first communication device; wherein the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a subsequence of a target length as a basic unit and according to a resource mapping rule corresponding to the subsequence of the target length, the frequency division cover code sequences are used for code division multiplexing of ports of the target demodulation reference signal, and N is a positive integer.

2. The target length subsequence is a subsequence of a first length; a subsequence of a second length; and a subsequence of a third length, 2. The method of claim 1, wherein the first length is 2, the second length is 4, and the third length is 6.

3. The frequency division cover code sequence is A subsequence of a first length is taken as a basic unit, and the subsequence of the first length is mapped to two subcarriers in a symbol occupied by the port in the form of a first mapping rule, and the two subcarriers belong to the same RB; Taking a subsequence of a second length as a basic unit, mapping the subsequence of the second length to four subcarriers in a symbol occupied by the port in the form of a second mapping rule, and the four subcarriers belong to the same RB or two RBs; 3. The method of claim 2, wherein the subsequence is generated by one of the following schemes: generating a subsequence of a third length as a basic unit; and mapping the subsequence of the third length to six subcarriers in a symbol occupied by the port in the form of a third mapping rule, and the six subcarriers belong to the same RB.

4. The first length subsequence is A first subsequence, [+1, +1]; A second subsequence [+1, -1]; and A third subsequence, [−1, −1]; and and a fourth subsequence [-1, +1].

5. The second length subsequence is a fifth subsequence [+1, +1, +1, +1]; and A sixth subsequence [+1, -1, +1, -1]; and a seventh subsequence [+1, +1, -1, -1]; and an eighth subsequence [+1, -1, -1, +1].

6. The third length subsequence is a ninth subsequence [+1, +1, +1, +1, +1, +1]; a tenth subsequence [+1, -1, +1, -1, +1, -1]; an eleventh subsequence, [+1, +1, -1, -1, +1, +1]; and a twelfth subsequence [+1, -1, -1, +1, +1, -1].

7. 5. The method of claim 4, wherein when generating the frequency division cover code sequence using the first subsequence and the third subsequence as a basic unit, the first mapping rule is to alternately map the first subsequence and the third subsequence to subcarriers in a symbol occupied by a port.

8. 5. The method of claim 4, wherein when generating the frequency division cover code sequence using the second subsequence and the fourth subsequence as a basic unit, the first mapping rule is to alternately map the second subsequence and the fourth subsequence to subcarriers in a symbol occupied by a port.

9. The method of claim 1 , wherein the frequency division cover code sequence is generated starting from a starting subcarrier of a common resource block numbered zero.

10. 3. The method of claim 2, wherein when the frequency division cover code sequence is generated using a subsequence of a first length or a subsequence of a second length as a basic unit, the target demodulation reference signal is a demodulation reference signal of a first configuration type or a second configuration type, where the first configuration type is associated with a configuration type 1 of a demodulation reference signal, and the second configuration type is associated with a configuration type 2 of a demodulation reference signal.

11. 3. The method of claim 2, wherein when the frequency division cover code sequence is generated using a subsequence of a third length as a basic unit, the target demodulation reference signal is of a first configuration type, where the first configuration type is associated with a configuration type 1 of a demodulation reference signal.

12. When the first communication device is a terminal and the second communication device is a network side device, the method includes:

2. The method of claim 1, further comprising: the terminal receiving despreading instruction information from the network side equipment, the despreading instruction information being used to indicate corresponding despreading window information when the terminal performs channel estimation of the target demodulation reference signal, and the despreading window information including a despreading window length.

13. The first communication device performing channel estimation on the target demodulation reference signal, The method of claim 12 , comprising the terminal performing channel estimation for the target demodulation reference signal based on the despreading window length.

14. The method of claim 13 , wherein the despreading window length is two or four.

15. The terminal performing channel estimation on the target demodulation reference signal based on the despreading window length, When the despreading window length is 2, for ports belonging to the same code division multiplexing group in the target demodulation reference signal, the terminal performs joint channel estimation using two adjacent subcarriers occupied by the port in a symbol as a despreading window; 15. The method according to claim 14, further comprising: when the despreading window length is 4, for ports belonging to the same code division multiplexing group in the target demodulation reference signal, the terminal performs joint channel estimation using four adjacent subcarriers occupied by the port in a symbol as a despreading window.

16. Before the terminal receives despreading instruction information from the network side device, the method includes: The method of claim 12, further comprising: the terminal reporting the channel estimation capability of the terminal to the network side equipment.

17. The method of claim 16 , wherein the channel estimation capability is used to indicate whether the terminal supports performing channel estimation of a demodulation reference signal based on a despreading window length of four.

18. When the first communication device is a terminal and the second communication device is a network side device, before the terminal receives a target demodulation reference signal from the network side device, the method includes:

2. The method of claim 1, further comprising: the terminal reporting to the network side equipment a downlink data reception capability supported by the terminal, the downlink data reception capability including a capability of a number of RB types of a physical downlink shared channel (PDSCH) supported by the terminal.

19. The RB number type of the PDSCH is The number of RBs of the PDSCH is an even number; and 20. The method of claim 18, comprising one of: a number of RBs of the PDSCH being odd or even.

20. 20. The method of claim 18, wherein the terminal receives target configuration information from the network side device, the target configuration information corresponds to a downlink data reception capability reported by the terminal, and the target configuration information is used to indicate a number of RBs type of a PDSCH to be received by the terminal.

21. A demodulation reference signal transmission device, a transceiver module for receiving a target demodulation reference signal from a second communication device; a computation module for performing channel estimation on the target demodulation reference signal; Here, the target demodulation reference signal is generated based on N frequency division cover code sequences, the N frequency division cover code sequences are generated with a subsequence of a target length as a basic unit and according to a resource mapping rule corresponding to the subsequence of the target length, the frequency division cover code sequences are used for code division multiplexing of ports of the target demodulation reference signal, and N is a positive integer.

22. A demodulation reference signal transmission method, comprising: A second communication device generates N frequency division cover code sequences according to a resource mapping rule corresponding to the target length subsequence as a basic unit, and the frequency division cover code sequences are used for code division multiplexing of a demodulation reference signal port of a target demodulation reference signal; and generating a target demodulation reference signal based on the N frequency division cover code sequences by the second communication device and transmitting the target demodulation reference signal to the first communication device; Here, N is a positive integer.

23. The target length subsequence is a subsequence of a first length; a subsequence of a second length; and a subsequence of a third length, 23. The method of claim 22, wherein the first length is 2, the second length is 4, and the third length is 6.

24. The generating N frequency division cover code sequences using a subsequence of a target length as a basic unit and a resource mapping rule corresponding to the subsequence of the target length, A subsequence of a first length is taken as a basic unit, and the subsequence of the first length is mapped to two subcarriers in a symbol occupied by the port in the form of a first mapping rule, and the two subcarriers belong to the same RB; Taking a subsequence of a second length as a basic unit, mapping the subsequence of the second length to four subcarriers in a symbol occupied by the port in the form of a second mapping rule, and the four subcarriers belong to the same RB or two RBs; 24. The method of claim 23, comprising one of the following schemes: generating a third length subsequence as a basic unit; and mapping the third length subsequence to six subcarriers in a symbol occupied by the port in the form of a third mapping rule, and the six subcarriers belong to the same RB.

25. The first length subsequence is A first subsequence, [+1, +1]; A second subsequence [+1, -1]; and A third subsequence, [−1, −1]; and and a fourth subsequence [-1, +1].

26. The second length subsequence is a fifth subsequence [+1, +1, +1, +1]; and A sixth subsequence [+1, -1, +1, -1]; and a seventh subsequence [+1, +1, -1, -1]; and an eighth subsequence [+1, -1, -1, +1].

27. The third length subsequence is a ninth subsequence [+1, +1, +1, +1, +1, +1]; a tenth subsequence [+1, -1, +1, -1, +1, -1]; an eleventh subsequence, [+1, +1, -1, -1, +1, +1]; and a twelfth subsequence [+1, -1, -1, +1, +1, -1].

28. 26. The method of claim 25, wherein when generating a frequency division cover code sequence using the first subsequence and the third subsequence as a basic unit, the first mapping rule is to alternately map the first subsequence and the third subsequence to subcarriers in a symbol occupied by a port.

29. 26. The method of claim 25, wherein when generating a frequency division cover code sequence using the second subsequence and the fourth subsequence as a basic unit, the first mapping rule is to alternately map the second subsequence and the fourth subsequence to subcarriers in a symbol occupied by a port.

30. 23. The method of claim 22, wherein the frequency division cover code sequence is generated starting from a starting subcarrier of a common resource block numbered zero.

31. 24. The method of claim 23, wherein when the frequency division cover code sequence is generated using a subsequence of a first length or a subsequence of a second length as a basic unit, the target demodulation reference signal is a demodulation reference signal of a first configuration type or a second configuration type, where the first configuration type is associated with configuration type 1 of a demodulation reference signal and the second configuration type is associated with configuration type 2 of a demodulation reference signal.

32. 24. The method of claim 23, wherein when the frequency division cover code sequence is generated using a subsequence of a third length as a basic unit, the demodulation reference signal is of a first configuration type, where the first configuration type is associated with a configuration type 1 of a demodulation reference signal.

33. When the first communication device is a terminal and the second communication device is a network side device, the method includes: The method of claim 22, further comprising: the network side equipment transmitting despreading instruction information to the terminal, the despreading instruction information being used to indicate corresponding despreading window information when the terminal performs channel estimation of the target demodulation reference signal, and the despreading window information including a despreading window length.

34. The method of claim 33, wherein the despreading window length is two or four.

35. Before the network side device transmits despreading instruction information to the terminal, the method further comprises: The method of claim 33, further comprising: the network side equipment receiving from the terminal a channel estimation capability of the terminal.

36. 36. The method of claim 35, wherein the channel estimation capability is used to indicate whether the terminal supports performing channel estimation of a demodulation reference signal based on a despreading window length of four.

37. When the first communication device is a terminal and the second communication device is a network side device, before the network side device transmits a target demodulation reference signal to the terminal, the method includes: The method of claim 22, further comprising: the network side equipment receiving from the terminal a downlink data reception capability supported by the terminal, the downlink data reception capability including a capability of a number of RB types of a PDSCH supported by the terminal.

38. The RB number type of the PDSCH is The number of RBs of the PDSCH is an even number; and 38. The method of claim 37, comprising one of: a number of RBs of the PDSCH being odd or even.

39. 38. The method of claim 37, wherein the network side equipment transmits target configuration information to the terminal, the target configuration information corresponding to a downlink data reception capability supported by the terminal that the network side equipment receives from the terminal, and the target configuration information is used to indicate a number of RBs type of a PDSCH to be received by the terminal.

40. A demodulation reference signal transmission device, A generating module for generating N frequency division cover code sequences according to a resource mapping rule corresponding to the target length subsequence as a basic unit, the frequency division cover code sequences being used for code division multiplexing of demodulation reference signal ports of a target demodulation reference signal; a transmission module for generating a target demodulation reference signal based on the N frequency division cover code sequences and transmitting the target demodulation reference signal to a first communication device; Here, the N is a positive integer.

41. A terminal including a processor and a memory, the memory storing a program or instructions operable on the processor, the terminal realizing the steps of the demodulation reference signal transmission method according to any one of claims 1 to 20 when the program or instructions are executed by the processor.

42. A network side device comprising a processor and a memory, the memory storing a program or instructions operable on the processor, the network side device realizing the steps of the demodulation reference signal transmission method described in any one of claims 22 to 39 when the program or instructions are executed by the processor.

43. A readable storage medium having a program or instructions stored therein, the program or instructions, when executed by a processor, realizing a demodulation reference signal transmission method according to any one of claims 1 to 20, or realizing steps of a demodulation reference signal transmission method according to any one of claims 22 to 39.

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