DMRS transmission method and apparatus, and device

Abstract

The present application belongs to the field of communications. Disclosed are a DMRS transmission method and apparatus, and a device. The DMRS transmission method in the embodiments of the present application comprises: a terminal transmitting a DMRS on at least two sub-bandwidths, wherein the DMRS satisfies at least one of the following: a first frequency-domain resource that corresponds to the DMRS meeting a first constraint condition, or the DMRS corresponding to different first parameters on at least some of the at least two sub-bandwidths.

Description

DMRS transmission methods, devices and equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411995542.7, filed with the Chinese Patent Office on December 31, 2024, entitled "DMRS Transmission Method, Apparatus and Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of communication technology, specifically relating to a DMRS transmission method, apparatus, and device. Background Technology

[0004] In New Radio (NR) systems, the Demodulation Reference Signal (DMRS) is primarily designed based on a single bandwidth or a single frequency band. For example, the configuration and resources used by the DMRS are consistent across a specific bandwidth or a portion of a bandwidth (BWP).

[0005] However, with the evolution of communication technology, the current DMRS design is no longer applicable in some scenarios. For example, how to design a more suitable DMRS for a situation where multiple discrete frequency bands are aggregated to form a large bandwidth, in order to improve the system's transmission performance, is a problem that needs to be solved. Summary of the Invention

[0006] This application provides a DMRS transmission method, apparatus, and device that can solve the design problem of DMRS in the case of aggregating multiple discrete frequency bands to form a large bandwidth, thereby improving the transmission performance of the system.

[0007] Firstly, a DMRS transmission method is provided, including:

[0008] The terminal transmits DMRS on at least two sub-bandwidths;

[0009] Wherein, the DMRS satisfies at least one of the following:

[0010] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0011] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0012] Secondly, a DMRS transmission method is provided, including:

[0013] Network-side devices transmit DMRS over at least two sub-bandwidths;

[0014] Wherein, the DMRS satisfies at least one of the following:

[0015] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0016] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0017] Thirdly, a DMRS transmission device is provided, comprising: a transmitting module and a receiving module;

[0018] The transmitting module or the receiving module is used to transmit DMRS over at least two sub-bandwidths;

[0019] Wherein, the DMRS satisfies at least one of the following:

[0020] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0021] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0022] Fourthly, a DMRS transmission device is provided, comprising: a transmitting module and a receiving module;

[0023] The transmitting module or the receiving module is used to transmit DMRS over at least two sub-bandwidths;

[0024] Wherein, the DMRS satisfies at least one of the following:

[0025] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0026] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0027] Fifthly, a DMRS transmission apparatus is provided, the apparatus being configured to perform the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0028] In a sixth aspect, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0029] Seventhly, a terminal is provided, including a processor and a communication interface;

[0030] The communication interface is used to transmit DMRS over at least two sub-bandwidths;

[0031] Wherein, the DMRS satisfies at least one of the following:

[0032] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0033] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0034] Eighthly, a network-side device is provided, the network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the second aspect.

[0035] Ninthly, a network-side device is provided, including a processor and a communication interface;

[0036] The communication interface is used to transmit DMRS over at least two sub-bandwidths;

[0037] Wherein, the DMRS satisfies at least one of the following:

[0038] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0039] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0040] In a tenth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0041] Eleventhly, a wireless communication system is provided, comprising: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the method as described in the first aspect, and the network-side device can be used to perform the steps of the method as described in the second aspect.

[0042] In a twelfth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0043] In a thirteenth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor to implement the steps of the DMRS transmission method as described in the first aspect, or to implement the steps of the DMRS transmission method as described in the second aspect.

[0044] In this embodiment, the terminal transmits DMRS on at least two sub-bandwidths, and / or the network-side device transmits DMRS on at least two sub-bandwidths; wherein the DMRS satisfies at least one of the following: the first frequency domain resource corresponding to the DMRS satisfies a first constraint condition; the first parameter corresponding to the DMRS is different on at least a portion of the at least two sub-bandwidths. This improves the performance and flexibility of transmitting DMRS over a large bandwidth composed of multiple discrete frequency bands, enhances the channel estimation performance of the DMRS, and ultimately improves the system's transmission performance. Attached Figure Description

[0045] Figure 1 is a schematic diagram of a communication system architecture provided in an embodiment of this application.

[0046] Figure 2 is one of the schematic flowcharts of the DMRS transmission method provided according to an embodiment of this application.

[0047] Figure 3 is a schematic diagram of constraining the sub-bandwidth corresponding to DMRS according to an embodiment of this application.

[0048] Figure 4 is a schematic diagram of constraining the BWP corresponding to the DMRS according to an embodiment of this application.

[0049] Figure 5 is a schematic diagram of constraining the RB corresponding to the DMRS according to an embodiment of this application.

[0050] Figure 6 is a schematic diagram of different sub-bandwidths using different DMRS ports according to embodiments of this application.

[0051] Figure 7 is a schematic diagram showing the inclusion relationship between the DMRS ports used for different sub-bandwidths according to the embodiments of this application.

[0052] Figure 8 is a second schematic flowchart of the DMRS transmission method provided according to an embodiment of this application.

[0053] Figure 9 is one of the schematic block diagrams of a DMRS transmission device provided according to an embodiment of this application.

[0054] Figure 10 is a second schematic block diagram of a DMRS transmission device provided according to an embodiment of this application.

[0055] Figure 11 is a schematic block diagram of a communication device provided according to an embodiment of this application.

[0056] Figure 12 is a schematic diagram of the hardware structure of a terminal according to an embodiment of this application.

[0057] Figure 13 is a schematic block diagram of a network-side device provided according to an embodiment of this application. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0059] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0060] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as the sender explicitly informing the receiver of specific information, the required operation, or the requested result in the instruction sent. An indirect instruction can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the required operation or requested result based on the judgment result.

[0061] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in 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), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0062] Figure 1 shows a block diagram of a wireless communication system applicable to an embodiment of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as User Equipment (UE), and can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in this application embodiment. Network-side equipment 12 may include access network equipment or core network equipment, wherein access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, Wireless Local Area Network (WLAN) access points (APs), or Wireless Fidelity (WiFi) nodes, etc.Among them, base stations can be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), Non-Terrestrial Network (NTN) equipment (such as satellite or high altitude platform stations). The term "base station" can be any suitable term in the field, such as "station" or any other appropriate term in the relevant field, as long as the same technical effect is achieved. The term "base station" is not limited to any specific technical term. It should be noted that the embodiments of this application only use the base station in the NR system as an example for introduction, and do not limit the specific type of base station.

[0063] Core network equipment, also known as core network nodes, core network functions, or core network elements, includes, but is not limited to, at least one of the following: 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 (L-NEF), and Binding Support. Functions include BSF, Application Function (AF), Location Management Function (LMF), Gateway Mobile Location Centre (GMLC), Network Data Analytics Function (NWDAF), and Non-Terrestrial Network (NTN) equipment (such as satellite or high altitude platform station).It should be noted that the embodiments of this application only use the core network equipment in the NR system as an example for introduction, and do not limit the specific type of core network equipment. If the name of the core network equipment mentioned in the embodiments of this application changes in subsequent protocol versions (e.g., 6G), it is also within the scope of protection of this application.

[0064] Optionally, the core network equipment can be implemented by one or more functional modules in a single device, or by multiple devices working together; this application does not specifically limit this. It is understood that the aforementioned functional modules can be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (e.g., a cloud platform).

[0065] To better understand the technical solution of this application, the DMRS related to this application is explained below.

[0066] In NR systems, the DMRS of the data channels (Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH)) is mainly used for demodulation of the data channels. For different use cases, DMRS can be divided into DMRS configuration type 1 and DMRS configuration type 2. DMRS configuration type 1 supports a maximum of 4 ports with a single symbol structure and a maximum of 8 ports with a double symbol structure; DMRS configuration type 2 supports a maximum of 6 ports with a single symbol structure and a maximum of 12 ports with a double symbol structure. Furthermore, DMRS configuration type 1 supports 2 code division multiplexing (CDM) groups, while DMRS configuration type 2 supports 3 CDM groups. Ports within the same CDM group are multiplexed using a Frequency Division Orthogonal Cover Code (FD-OCC) and a Time Division Orthogonal Cover Code (TD-OCC) of length 2.

[0067] In addition, DMRS in NR supports the configuration of additional symbols, meaning that a DMRS port can occupy multiple symbols to achieve channel estimation gain in the time domain, such as for high-speed mobile scenarios. Depending on the number of data channel scheduling symbols, DMRS supports a maximum of 3 additional symbols, occupying a total of 4 symbols. Furthermore, the number of additional symbols supported also varies depending on whether DMRS is a single-symbol or double-symbol structure.

[0068] To support more DMRS orthogonal ports, NR has enhanced DMRS, such as doubling the number of DMRS ports and using FD-OCC sequences of length 4 to multiplex DMRS ports within the same CDM group. That is, for DMRS configuration type 1, a single-symbol structure will support a maximum of 8 ports, and a dual-symbol structure will support a maximum of 16 ports; for DMRS configuration type 2, a single-symbol structure will support a maximum of 12 ports, and a dual-symbol structure will support a maximum of 24 ports.

[0069] In addition, the number of PUSCH data streams supported per terminal has been expanded from a maximum of 4 streams to a maximum of 8 streams. In other words, the DMRS corresponding to the PUSCH transmitted by each terminal also requires a maximum of 8 ports for multiplexing.

[0070] The DMRS transmission method provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0071] Figure 2 is a schematic flowchart of a DMRS transmission method 200 according to an embodiment of this application. As shown in Figure 2, the DMRS transmission method 200 may include at least some of the following:

[0072] S210, the terminal transmits DMRS on at least two sub-bandwidths;

[0073] Wherein, the DMRS satisfies at least one of the following:

[0074] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0075] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0076] It should be understood that Figure 2 illustrates the steps or operations of the DMRS transmission method 200, but these steps or operations are merely examples, and other operations or variations of the operations shown in Figure 2 may also be performed in this application.

[0077] The transmission described in the embodiments of this application can be understood as sending and / or receiving. For example, the terminal can send DMRS on at least two sub-bandwidths, and / or the terminal can receive DMRS on at least two sub-bandwidths.

[0078] The sub-bandwidth described in the embodiments of this application may also be referred to as or replaced by carrier, band, frequency band, spectrum, etc., and this application is not limited thereto. The sub-bandwidth described in the embodiments of this application can be understood as a sub-bandwidth within a discrete large bandwidth.

[0079] At least a portion of the at least two sub-bandwidths described in the embodiments of this application are discrete sub-bandwidths, that is, there is an interval between the sub-bandwidths.

[0080] At least some of the sub-bandwidths in the at least two sub-bandwidths described in the embodiments of this application may come from different sub-bandwidth groups, or at least some of the sub-bandwidths in the at least two sub-bandwidths described in the embodiments of this application may come from the same sub-bandwidth group; wherein, a sub-bandwidth group may be a set of multiple adjacent sub-bandwidths.

[0081] When multiple discrete frequency bands are aggregated to form a large bandwidth, the intervals between these bands present new challenges in areas such as DMRS sequence design, DMRS resource scheduling, and DMRS port indication and usage, requiring targeted enhancements. In this embodiment, the terminal transmits DMRS over at least two sub-bandwidths, wherein the DMRS satisfies at least one of the following: the first frequency domain resource corresponding to the DMRS satisfies a first constraint condition; and the first parameter corresponding to the DMRS differs across at least a portion of the at least two sub-bandwidths. This improves the performance and flexibility of transmitting DMRS over a large bandwidth composed of multiple discrete frequency bands, enhances DMRS channel estimation performance, and ultimately improves system transmission performance.

[0082] In some embodiments, the first frequency domain resource includes, but is not limited to, at least one of the following:

[0083] Resource Block (RB);

[0084] RB bundling;

[0085] Physical Resource Group (PRG);

[0086] BWP;

[0087] Sub-bandwidth;

[0088] A set of sub-bandwidths.

[0089] It should be noted that the set of sub-bandwidths described in the embodiments of this application can be any combination of sub-bandwidths, or it can include at least one group of sub-bandwidths.

[0090] Optionally, if the first frequency domain resource is a sub-bandwidth or a combination of sub-bandwidths, the first frequency domain resource may also include other sub-bandwidths besides the at least two sub-bandwidths. This application embodiment does not limit this.

[0091] In the embodiments of this application, a large bandwidth is composed of multiple discrete sub-bandwidths. For example, if at least two sub-bandwidths make up a large bandwidth, the interval between the sub-bandwidths may affect the resource mapping method of DMRS, especially when the FD-OCC sequence used for CDM multiplexing of DMRS ports is of a certain length.

[0092] For example, if the length of the FD-OCC sequence corresponding to DMRS is 4, and assuming that the number of subcarriers or resource elements (REs) on one symbol of one RB is 12, and one DMRS port occupies 6 of the 12 REs in one RB (e.g., in the frequency domain mapping form of comb-2), then an FD-OCC of length 4 will not be divisible by the 6 REs. That is, it takes 12 REs from two consecutive RBs to map 3 FD-OCCs of length 4. It should be noted that the above example uses an FD-OCC sequence of length 4; the indivisibility also occurs with other FD-OCC sequence lengths, such as an FD-OCC sequence of length 8, etc., which will not be elaborated here. For ease of explanation, unless otherwise specified, the following text will use an FD-OCC sequence of length 4 and one DMRS port occupying 6 of the 12 REs in one RB (in the frequency domain mapping form of comb-2) as an example.

[0093] To enable the terminal to perform correct channel estimation based on the FD-OCC sequence of the DMRS and reduce the terminal's processing complexity, constraints or restrictions can be imposed on the first frequency domain resources corresponding to the DMRS. For example, the first frequency domain resources corresponding to the DMRS can satisfy a first constraint condition. For instance, it can be ensured that the FD-OCC of length N on which the DMRS is based can be aligned with the first frequency domain resources, so that there will be no residual REs or subcarriers corresponding to the FD-OCC, i.e., isolated REs or isolated subcarriers, which would be difficult to process.

[0094] In some embodiments, the first constraint includes, but is not limited to, at least one of the following:

[0095] The RB offset difference between the target RBs of at least a portion of the first frequency domain resources corresponding to the DMRS is an even number;

[0096] The number of RBs between the starting RB and the reference point of at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0097] The number of RBs corresponding to at least a portion of the first frequency domain resources of the DMRS is even;

[0098] The number of RBs between at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0099] The number of the first frequency domain resources corresponding to the DMRS is an even number;

[0100] The sequence mapping of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0101] The sequence generation of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0102] The mapping of the FD-OCC sequence corresponding to the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0103] The FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resource corresponding to the DMRS.

[0104] In this embodiment, to enable the terminal to perform correct channel estimation based on the FD-OCC sequence corresponding to the DMRS and to reduce the processing complexity of the terminal, a first constraint condition is applied to constrain or limit the first frequency domain resources corresponding to the DMRS. This ensures that the FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resources corresponding to the DMRS, avoiding the occurrence of residual REs or subcarriers corresponding to the FD-OCC, i.e., isolated REs or isolated subcarriers, which are difficult to process. Furthermore, by constraining or limiting the first frequency domain resources corresponding to the DMRS through the first constraint condition, the network-side equipment can more flexibly instruct and use DMRS resources according to different service conditions or the different number of users residing on each sub-bandwidth. For example, different DMRS ports can be used on different sub-bandwidths to perform multi-user multiple-in multiple-out (MU-MIMO) scheduling on different sub-bandwidths, improving the overall performance and capacity of the system.

[0105] For example, by constraining or limiting the first frequency domain resources corresponding to the DMRS through the first constraint condition, it is ensured that the FD-OCC of length N on which the DMRS is based can be aligned with the first frequency domain resources, so that there will be no residual REs or subcarriers corresponding to the FD-OCC, that is, isolated REs or isolated subcarriers, which are difficult to process.

[0106] Optionally, the target RB can be the first RB in the first frequency domain resource, or the target RB can be the last RB in the first frequency domain resource, or the target RB can be a specific RB in the first frequency domain resource; wherein, the specific RB can be agreed upon by a protocol, or the specific RB can be configured by the network side.

[0107] Optionally, the reference point can be a common RB. For example, the reference point can be the first common RB, or the reference point can be reference point A, or the reference point can be the common RB where point A is located.

[0108] Optionally, aligning the FD-OCC sequence corresponding to the DMRS with the first frequency domain resource corresponding to the DMRS includes aligning the first code and / or the last code of the FD-OCC sequence corresponding to the DMRS with the boundary of the first frequency domain resource corresponding to the DMRS.

[0109] In some implementations, when the first frequency domain resource is a sub-bandwidth or a combination of sub-bandwidths, constraints can be imposed on the RB resources corresponding to the sub-bandwidths, i.e., the sub-bandwidths or combinations of sub-bandwidths corresponding to the DMRS satisfy the first constraint condition. For example, the sub-bandwidths or combinations of sub-bandwidths corresponding to the DMRS satisfy at least one of the following constraints: the total number of RB resources corresponding to each sub-bandwidth or combination of sub-bandwidths is even; the number of sub-bandwidths or combinations of sub-bandwidths is even; the RB interval between sub-bandwidths is even; the RB interval between the starting RB of each sub-bandwidth or combination of sub-bandwidths and the reference point (e.g., a reference RB, or the RB where the reference RE or reference subcarrier is located) is even; the mapping of the DMRS sequence or the mapping of FD-OCC starts from a certain sub-bandwidth (e.g., the first sub-bandwidth, such as the sub-bandwidth with the smallest frequency; the first sub-bandwidth of the combination of the first sub-bandwidths); or the mapping of the DMRS sequence or the mapping of FD-OCC starts from the first RB of each sub-bandwidth.

[0110] As shown in Figure 3, there are two sub-bandwidths, namely sub-bandwidth 1 and sub-bandwidth 2, each corresponding to an even number of RBs, and the RB interval between the two sub-bandwidths is also an even number of RBs. In addition, the RB interval between each sub-bandwidth and the reference point is also an even number of RBs.

[0111] In some implementations, when the first frequency domain resource is a BWP, constraints can be imposed on the RB resources corresponding to the BWP, i.e., the BWP corresponding to the DMRS satisfies the first constraint condition. For example, the BWP corresponding to the DMRS satisfies at least one of the following constraints: the number of RBs corresponding to each BWP is even; the total number of RBs corresponding to multiple BWPs is even; the number of BWPs is even; the RB interval between multiple BWPs is even; the RB interval between the starting RB of a BWP and a reference point (e.g., a common RB, such as the first common RB, or point A, or the common RB where point A is located) is even; the mapping of the DMRS sequence or the mapping of FD-OCC starts from a certain BWP (e.g., BWP; the first BWP among multiple BWPs, such as the BWP with the lowest frequency); or the mapping of the DMRS sequence or the mapping of FD-OCC starts from the first RB of each BWP.

[0112] As shown in Figure 4, there are two sub-bandwidths, namely sub-bandwidth 1 and sub-bandwidth 2, separated by an even number of RBs. A BWP occupies a portion of the bandwidth in both sub-bandwidths 1 and 2, and the number of RBs occupied by the BWP in both sub-bandwidths 1 and 2 is even. Furthermore, the RB interval between the BWP and the reference point is also even. In this case, the DMRS sequence mapping can start from the reference point or from the first RB of the BWP.

[0113] In some implementations, when the first frequency domain resource is RB bundling (such as PRG), constraints can be imposed on the RB bundling, meaning that the RB bundling corresponding to the DMRS satisfies the first constraint condition. For example, the RB bundling corresponding to the DMRS satisfies at least one of the following constraints: the number of RBs corresponding to the RB bundling is even; the number of RB bundlings is even; the RB interval between RB bundlings on different sub-bandwidths or BWPs is even; the RB interval between the first RB of the first RB bundling and the reference point (e.g., a common RB, such as the first common RB, or point A, or the common RB where point A is located) is even; the number of REs occupied by the RBs corresponding to the RB bundling in the DMRS is an integer multiple of the FD-OCC sequence of the DMRS (e.g., if the number of RBs corresponding to the RB bundling is 2, then the number of REs corresponding to the DMRS is 12, the length of the FD-OCC sequence is 4, and the multiple is 3); and the boundary of the RB bundling corresponds to the first RE of the FD-OCC sequence.

[0114] In some implementations, when the first frequency domain resource is a DMRS or an RB occupied by a PDSCH corresponding to the DMRS (i.e., an RB that is actually scheduled), constraints can be imposed on the RBs occupied by the DMRS, i.e., the RBs corresponding to the DMRS satisfy the first constraint condition. For example, the RBs corresponding to the DMRS satisfy at least one of the following constraints: the number of RBs occupied by the DMRS is even; the number of consecutive RBs occupied by the DMRS is even; the RB interval between the starting RB of the RBs occupied by the DMRS and the reference point (e.g., a common RB, such as the first common RB, or point A, or the common RB where point A is located) is even; the RB interval between the starting RB of each consecutive RB occupied by the DMRS and the reference point is even; the RB interval between multiple consecutive RBs occupied by the DMRS is even (e.g., the DMRS occupies 2 consecutive RBs, where the first consecutive RB occupies 4 RBs, the second consecutive RB occupies 8 RBs, and the interval between the two consecutive RBs is 2 RBs).

[0115] For example, Figure 5 shows an example where the PDSCH is allocated across two consecutive PDSCH RBs: the first segment corresponds to an even number of RBs (RB0 and RB1), and the second segment corresponds to an even number of RBs (RB4 and RB5). The interval between the RBs of the two consecutive PDSCH segments is two RBs (RB2 and RB3). Furthermore, the interval between the first RB of each consecutive RB segment and CRB0 (e.g., point A) is also an even number of RBs. Under these constraints, the terminal can perform channel estimation using FD-OCC without encountering orphan REs in the PDSCH, isolated REs in the DMRS, or isolated REs in the FD-OCC sequence of the DMRS.

[0116] It should be noted that: for the above four types of constraints, the terminal may need to satisfy one or more of these constraints. In addition, the above four types of constraints may also correspond to one terminal capability or multiple terminal capabilities (for example, each type of constraint corresponds to one terminal capability, or multiple types of constraints correspond to one terminal capability).

[0117] In some embodiments, the first parameter includes, but is not limited to, at least one of the following:

[0118] DMRS port;

[0119] Number of DMRS ports;

[0120] DMRS port index;

[0121] DMRS type;

[0122] Orthogonal cover code (OCC) sequence;

[0123] CDM group;

[0124] Occupation symbol;

[0125] Additional symbols;

[0126] Starting position of the prefix symbol;

[0127] Transmission power;

[0128] The time-domain resource mapping type of the data channel corresponding to the DMRS.

[0129] Optionally, the OCC sequence includes at least one of the following: FD-OCC sequence, TD-OCC sequence.

[0130] Optionally, the data channel corresponding to the DMRS includes, but is not limited to, at least one of the following:

[0131] Uplink data channel (e.g., PUSCH), downlink data channel (e.g., PDSCH).

[0132] For example, the DMRS ports corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths are different. These DMRS ports may be indicated by Downlink Control Information (DCI), configured by Radio Resource Control (RRC), or activated by the Media Access Control Control Element (MAC CE).

[0133] For example, the DMRS type may differ on at least a portion of the sub-bandwidths in at least two sub-bandwidths. For instance, there may be multiple DMRS types, each with a different DMRS pattern. The DMRS type may be indicated by DCI, activated by MAC CE, or configured by RRC.

[0134] For example, the time-domain resource mapping types of the data channels corresponding to the DMRS on at least a portion of the sub-bandwidths in at least two sub-bandwidths are different, such as Time Domain Resource Assignment (TDRA) Type A and TDRA Type B. The time-domain resource locations of the DMRS corresponding to different time-domain resource mapping types are different. These different time-domain resource mapping types can be indicated by DCI, configured by RRC, or activated by MAC CE.

[0135] In this embodiment, for at least a portion of the at least two sub-bandwidths, the DMRS used on them can be different, not only in terms of the DMRS port, but also in terms of the time-frequency resources corresponding to the same DMRS port. For example, occupied symbols, extra symbols, the starting position of the pre-symbol, DMRS type, etc., will all result in different time-frequency resources.

[0136] In the embodiments of this application, when using the same number of DMRS ports, different DMRS resources (e.g., DMRS port index, OCC sequence, CDM group, DMRS occupied symbols / extra symbols, transmission power, etc.) can be used on different sub-bandwidths or sub-bandwidth groups, thereby making DMRS scheduling more flexible, avoiding isolated REs, and thus improving the overall scheduling flexibility of the network.

[0137] In some implementations, different sub-bandwidths use different DMRS ports while maintaining the same total number of DMRS ports. In this case, although the total number of DMRS ports is the same across different sub-bandwidths, the DMRS ports (or DMRS port indices) used are different.

[0138] Assuming the length of the FD-OCC sequence corresponding to DMRS is 4, and assuming the number of subcarriers or REs on one symbol of one RB is 12, and one DMRS port occupies 6 of the 12 REs in one RB (for example, the frequency domain mapping form of comb-2), then the FD-OCC of length 4 cannot be divided by the 6 REs. That is to say, it takes 12 REs from 2 consecutive RBs to map 3 FD-OCCs of length 4.

[0139] Assume there are two sub-bandwidths, sub-bandwidth 1 and sub-bandwidth 2, with DMRS scheduling on both. DMRS occupies an even number of RBs on sub-bandwidth 1 and an odd number of RBs on sub-bandwidth 2. The number of DMRS ports on both sub-bandwidths is two. If the DMRS ports used on sub-bandwidth 1 are port 0 and port 1, and the DMRS ports used on sub-bandwidth 2 are also port 0 and port 1, and port 0 and port 1 belong to the same CDM group (DMRS ports in the same CDM group are code-division multiplexed based on a 4-bit FD-OCC sequence), then an isolated RE problem will occur on sub-bandwidth 2, thus affecting DMRS channel estimation.

[0140] Therefore, as shown in Figure 6, DMRS ports 0 and 1 can be used on sub-bandwidth 1, while DMRS ports 0 and 2 can be used on sub-bandwidth 2 (DMRS ports 0 and 2 use different CDM groups, i.e., occupy different REs). In this case, since DMRS ports 0 and 2 do not use a 4-length FD-OCC sequence for code division multiplexing, channel estimation can be performed based on a 2-length FD-OCC sequence, or even based on a 1-length FD-OCC sequence, depending on the network-side instructions or the default convention of the protocol.

[0141] In some implementations, when different DMRS ports are used, different FD-OCC sequences and / or TD-OCC sequences may be used on different sub-bandwidths because different DMRS ports may correspond to different FD-OCC sequences and / or TD-OCC sequences.

[0142] For example, DMRS port 0 and DMRS port 1 are used on sub-bandwidth 1, where DMRS port 0 corresponds to FD-OCC sequence 1 (e.g., [1 1 1 1]) and DMRS port 1 corresponds to FD-OCC sequence 2 (e.g., [1 -1 1 -1]); DMRS port 0 and DMRS port 2 are used on sub-bandwidth 1, where DMRS port 0 corresponds to FD-OCC sequence 1 (e.g., [1 1 1 1]) and DMRS port 2 corresponds to FD-OCC sequence 2 (e.g., [1 1 1 1]). In another example, DMRS port 0 and DMRS port 1 are used on sub-bandwidth 1, where DMRS port 0 corresponds to FD-OCC sequence 1 (e.g., [1 1 1 1]) and TD-OCC sequence 1 (e.g., [1 1]), and DMRS port 1 corresponds to FD-OCC sequence 2 (e.g., [1 -1 1 -1]) and TD-OCC sequence 1 (e.g., [1 1]); DMRS port 0 and DMRS port 4 are used on sub-bandwidth 1, where DMRS port 0 corresponds to FD-OCC sequence 1 (e.g., [1 1 1 1]) and TD-OCC sequence 1 (e.g., [1 1]), and DMRS port 4 corresponds to FD-OCC sequence 1 (e.g., [1 1 1 1]) and TD-OCC sequence 2 (e.g., [1 -1]).

[0143] In some implementations, different DMRS ports may correspond to different CDM groups when using different DMRS ports.

[0144] For example, DMRS ports 0 and 1 are used on sub-bandwidth 1 (DMRS ports 0 and 1 use the same CDM group), while DMRS ports 0 and 2 are used on sub-bandwidth 2 (DMRS ports 0 and 2 use different CDM groups, i.e., occupy different REs). In this case, one CDM group is used on sub-bandwidth 1 and two CDM groups are used on sub-bandwidth 2, meaning that the CDM groups occupied by the DMRS are different on different sub-bandwidths. Optionally, the CDM groups available on each sub-bandwidth can be indicated by the network side or agreed upon by the protocol by default (e.g., related to the frequency domain resource size of the sub-bandwidth).

[0145] In some implementations, different DMRS ports may correspond to different CDM groups, which will further affect the transmit power of the DMRS ports.

[0146] For example, DMRS ports 0 and 1 are used on sub-bandwidth 1 (DMRS ports 0 and 1 use the same CDM group), while DMRS ports 0 and 2 are used on sub-bandwidth 2 (DMRS ports 0 and 2 use different CDM groups, i.e., occupy different REs). In this case, if there is no data occupied on other CDM groups on sub-bandwidth 1, the corresponding power can be used to increase the transmission power of DMRS ports 0 and 1, i.e., power boosting. However, since sub-bandwidth 2 uses two CDM groups, if there are no other CDM groups, the corresponding power cannot be used to increase the transmission power of DMRS ports 0 and 2. If other CDM groups exist, the corresponding power can be used to increase the transmission power of DMRS ports 0 and 2, but the power boosting on DMRS ports 0 and 2 is different from that on DMRS ports 0 and 1.

[0147] In some implementations, different DMRS ports may correspond to different numbers of DMRS symbols.

[0148] A single-symbol structure corresponds to a portion of the sub-bandwidth, while a multi-symbol structure (e.g., a double-symbol structure) corresponds to another portion of the sub-bandwidth. For example, DMRS port 0 and DMRS port 1 are used on sub-bandwidth 1, where DMRS port 0 and DMRS port 1 only require 1 DMRS symbol, which corresponds to a single-symbol structure; while DMRS port 0 and DMRS port 4 are used on sub-bandwidth 2, where DMRS port 0 and DMRS port 4 require 2 DMRS symbols, which corresponds to a double-symbol structure.

[0149] Of course, the total number of DMRS symbols can also differ across different sub-bandwidths. For example, some sub-bandwidths might use X DMRS symbols (1 pre-symbol + X-1 extra symbols), while others might use Y DMRS symbols (1 pre-symbol + Y-1 extra symbols). Since different sub-bandwidths correspond to different frequency points, the corresponding Doppler frequency domain may differ when the terminal is moving, thus requiring different numbers of DMRS symbols. Optionally, the number of DMRS symbols used on each sub-bandwidth can be specified by the network side or agreed upon by the protocol default.

[0150] It should be noted that the different sub-bandwidths / sub-bandwidth groups mentioned above correspond to different DMRS resources. In addition to solving the orphan RE problem, they also allow the network to more flexibly direct and use DMRS resources according to different service conditions or the number of users residing on each sub-bandwidth. For example, MU-MIMO scheduling on different sub-bandwidths can be performed by using different DMRS ports on different sub-bandwidths, thereby improving the overall performance and capacity of the system.

[0151] In this embodiment, DMRS can be used more flexibly on different sub-bandwidths. For example, different numbers of DMRS ports can be allocated to different sub-bandwidths. Alternatively, the number of DMRS ports used on different sub-bandwidths can also be the same.

[0152] In some embodiments, network-side devices can use DMRS ports more flexibly based on the service situation or the number of users residing on each sub-bandwidth, and can also be used to effectively avoid isolated REs.

[0153] For example, M DMRS ports may be used on one sub-bandwidth, and N DMRS ports may be used on another sub-bandwidth. The M and N DMRS ports may be inclusive, or they may be shared, or even different.

[0154] In some implementations, it is assumed that there are two sub-bandwidths, namely sub-bandwidth 1 and sub-bandwidth 2, as shown in Figure 7. Four DMRS ports are used on sub-bandwidth 1, namely DMRS port 0, DMRS port 1, DMRS port 2, and DMRS port 3; while only two DMRS ports are used on sub-bandwidth 2, namely DMRS port 0 and DMRS port 2. In this case, there is an inclusion relationship between the corresponding DMRS ports of the two.

[0155] In some implementations, it is assumed that there are two sub-bandwidths, namely sub-bandwidth 1 and sub-bandwidth 2. Sub-bandwidth 1 uses four DMRS ports, namely DMRS port 0, DMRS port 1, DMRS port 2, and DMRS port 3; while sub-bandwidth 2 only uses two DMRS ports, namely DMRS port 0 and DMRS port 4. In this case, some DMRS ports are shared between the two, namely DMRS port 0.

[0156] In some implementations, it is assumed that there are two sub-bandwidths, namely sub-bandwidth 1 and sub-bandwidth 2. Sub-bandwidth 1 uses 4 DMRS ports, namely DMRS port 0, DMRS port 1, DMRS port 2, and DMRS port 3; while sub-bandwidth 2 uses only 1 DMRS port, namely DMRS port 4. In this case, the DMRS ports used in the two implementations are different.

[0157] Network-side devices can flexibly allocate DMRS ports on each sub-bandwidth based on the service volume or the number of users residing on each sub-bandwidth. For example, when the number of users residing on different sub-bandwidths is different, the network-side device can schedule more MU-MIMO paired users on sub-bandwidth 2, thus allocating fewer DMRS ports per user; while on sub-bandwidth 1, priority can be given to ensuring more user data flow, thereby using more DMRS ports, but the number of MU-MIMO users can be appropriately reduced.

[0158] It should be noted that since the number of DMRS ports used on different sub-bandwidths varies, the DMRS transmission power on each sub-bandwidth may differ in some cases, i.e., the power boosting may differ, similar to the situation in the previous embodiments, which will not be elaborated here. Furthermore, when different numbers of DMRS ports are used on sub-bandwidths, the corresponding number of PDSCH data streams can also be different, or they can be the same. For example, the number of PDSCH data streams corresponding to DMRS on sub-bandwidth 1 may be 4, while the number of PDSCH data streams corresponding to DMRS on sub-bandwidth 2 may be 2 or 4 (depending on the association between DMRS ports and PDSCH data streams).

[0159] In some implementations, the DMRS used on different sub-bandwidths or sub-bandwidth groups can have different DMRS ports, and the time-frequency resources corresponding to the same DMRS port can also be different. For example, the number of symbols used, additional symbols, the starting position of the pre-symbol, and the type of DMRS used will all result in different time-frequency resources.

[0160] For example, different sub-bandwidths correspond to different DMRS symbols, which may be indicated by DCI or configured by RRC.

[0161] For example, different sub-bandwidths correspond to different pre-symbol start positions, and the DMRS pre-symbol start position can be indicated by DCI or configured by RRC.

[0162] For example, different sub-bandwidths correspond to different time-domain resource mapping types for PDSCH or PUSCH (such as TDRA Type A and TDRA Type B), and the time-domain resource locations of DMRS corresponding to different PDSCH or PUSCH time-domain resource mapping types are different. These different time-domain resource mapping types can be indicated by DCI, configured by RRC, or activated by MAC CE.

[0163] For example, different sub-bandwidths correspond to different DMRS types (e.g., there are multiple DMRS types with different corresponding patterns), and the DMRS type can be indicated by DCI or configured by RRC.

[0164] It should be noted that in related technologies, the DCI is used to indicate the DMRS port used by the PDSCH or PUSCH. However, since the entire bandwidth corresponds to the same DMRS port, only one DCI field is needed for indication. However, in the embodiments of this application, how to indicate the DMRS port used on different sub-bandwidths or sub-bandwidth groups requires further solution.

[0165] In some embodiments, the DMRS transmission method 200 further includes:

[0166] The terminal receives the first signaling from the network-side device;

[0167] The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

[0168] In this embodiment, the network-side device can use the first signaling to indicate the first parameter corresponding to each of the at least two sub-bandwidths of DMRS, thereby improving the performance of transmitting DMRS on a large bandwidth composed of multiple discrete frequency bands and better enhancing the transmission performance of the system.

[0169] Optionally, the first signaling can be DCI. It should be understood that the first signaling can also be other signaling, and this application is not limited to this.

[0170] In some embodiments, a field (such as a DCI field) in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths. For example, the first parameter is a DMRS port, wherein each DMRS port combination corresponds to a sub-bandwidth, or each DMRS port combination corresponds to a sub-bandwidth group, or each DMRS port combination corresponds to a set of sub-bandwidths.

[0171] In this embodiment, a field in the first signaling indicates a first parameter corresponding to at least two sub-bandwidths, thereby reducing the overhead of the first signaling.

[0172] In some embodiments, at least two fields (such as DCI fields) in the first signaling indicate the first parameter corresponding to at least one of the at least two sub-bandwidths. Optionally, when the number of the at least one sub-bandwidth is greater than or equal to 2, at least two fields in the first signaling indicate the first parameter corresponding to a group of sub-bandwidths, or at least two fields in the first signaling indicate the first parameter corresponding to a set of sub-bandwidths.

[0173] In some embodiments, at least two codepoints in a field (such as a DCI field) of the first signaling indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

[0174] It should be noted that the code points described in the embodiments of this application can also be referred to as or replaced by subdomains or subgroups.

[0175] In some embodiments, when an information field in the first signaling indicates the DMRS port corresponding to the at least two sub-bandwidths, the DMRS port corresponding to the at least two sub-bandwidths satisfies at least one of the following:

[0176] The number of DMRS ports corresponding to each sub-bandwidth in the at least two sub-bandwidths is the same, or the number of DMRS ports corresponding to each sub-bandwidth group in the at least two sub-bandwidths is the same;

[0177] The DMRS ports corresponding to at least some of the at least two sub-bandwidths are different, or the DMRS ports corresponding to at least some of the sub-bandwidth groups are different.

[0178] The DMRS ports corresponding to at least a portion of the at least two sub-bandwidths are associated with different DMRS port indication tables, or the DMRS ports corresponding to at least a portion of the at least two sub-bandwidth groups are associated with different DMRS port indication tables.

[0179] There is an inclusion relationship between the DMRS ports corresponding to at least some of the at least two sub-bandwidths, or there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths.

[0180] In this embodiment, when an information field in the first signaling indicates at least two DMRS ports corresponding to sub-bandwidths, the DMRS ports corresponding to at least two sub-bandwidths are constrained or limited, thereby improving the channel estimation performance of DMRS transmission over a large bandwidth composed of multiple discrete frequency bands, and thus better improving the transmission performance of the system.

[0181] In some embodiments, where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidths in the at least two sub-bandwidths, or where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths, the DMRS ports corresponding to the first sub-bandwidth in the at least two sub-bandwidths are a subset of the DMRS ports corresponding to the second sub-bandwidth in the at least two sub-bandwidths;

[0182] The method for determining the DMRS port in the subset includes at least one of the following: a protocol default agreement, indicated by a second signaling sent by the network-side device.

[0183] It should be understood that the at least two sub-bandwidths may include one or more first sub-bandwidths and one or more second sub-bandwidths, and this application embodiment is not limited in this respect.

[0184] Optionally, the first signaling and the second signaling can be of the same type or different, and this embodiment of the application does not limit this. For example, the second signaling can be RRC signaling.

[0185] Optionally, the function of the second signaling can also be achieved through the first signaling described above, that is, the first signaling can also be used to indicate the determination method of the DMRS ports in the subset.

[0186] In some embodiments, the DMRS transmission method 200 further includes:

[0187] The terminal receives third signaling from the network-side device;

[0188] The third signaling is used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0189] In this embodiment, the network-side device can use third signaling to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths, so that the terminal can transmit the DMRS based on the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0190] Optionally, the content indicated by the third signaling may include at least one of the following:

[0191] DMRS symbol, starting position of the prefix symbol, time-domain resource mapping type.

[0192] For example, different sub-bandwidths correspond to different DMRS symbols. In this case, the network-side device can indicate the DMRS symbol through third signaling, which can be DCI or RRC signaling.

[0193] For example, different sub-bandwidths correspond to different preamble start positions. In this case, the network-side device can indicate the preamble start position through third signaling, which can be DCI or RRC signaling.

[0194] For example, different sub-bandwidths correspond to different time-domain resource mapping types for PDSCH or PUSCH (i.e., TDRA Type A and TDRA Type B), and the time-domain resource locations of DMRS corresponding to different time-domain resource mapping types are different. The network-side device can indicate the time-domain resource mapping type via third signaling, which can be DCI, RRC, or MAC CE signaling.

[0195] Optionally, the first signaling, the second signaling, and the third signaling can be of the same type or different types, and this application embodiment does not limit this.

[0196] Optionally, the function of the third signaling can also be achieved through the first signaling mentioned above, that is, the first signaling can also be used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0197] In some implementations, taking DCI as the first signaling as an example, at least two DCI fields in DCI indicate at least two sub-bandwidth DMRS ports respectively.

[0198] At least two DCI fields are used to indicate DMRS ports on different sub-bandwidths or sub-bandwidth groups. For example, if there are P sub-bandwidths, then P DCI fields can be used to indicate the DMRS ports used on the P sub-bandwidths. Alternatively, some of the DMRS ports on some sub-bandwidths or sub-bandwidth groups can be pre-defined by the protocol or configured or activated through other signaling (e.g., RRC signaling, MAC CE signaling). In this case, the sub-bandwidths may be used for semi-persistent scheduling (SPS) transmission of the corresponding data, authentication-free transmission, or other pre-configured or pre-defined transmissions.

[0199] Optionally, at least two DCI domains can be replaced with P subdomains, subgroups, or codepoints within a single DCI domain. For example, P codepoints within a single DCI domain can be used to indicate DMRS ports on P subbands.

[0200] Furthermore, to reduce DCI indication overhead, the bit overhead for each DCI field can be different. For example, one sub-bandwidth can use K bits to indicate a DMRS port, while another sub-bandwidth can use K-1 bits to indicate a DMRS port. Optionally, the set, pool, or list of DMRS ports for the sub-bandwidths corresponding to the K-1 bits can be configured through other signaling or limited by default conventions, thereby reducing the corresponding DCI indication overhead.

[0201] In some implementations, taking DCI as the first signaling as an example, at least two sub-bandwidth DMRS ports are indicated through a DCI field in DCI.

[0202] A single DCI domain can indicate the DMRS ports for all sub-bandwidths, and the DMRS ports used on different sub-bandwidths can be different, which can reduce the DCI indication overhead.

[0203] Specifically, the DCI field indicates a value corresponding to a set of DMRS ports (including at least one DMRS port) on each sub-bandwidth. For example, there are at least two sub-bandwidths, each associated with multiple sets of DMRS ports, or a DMRS port indication table (containing multiple sets of DMRS ports, each set corresponding to a value indicated by the DCI field). Taking two sub-bandwidths (sub-bandwidth 1 and sub-bandwidth 2) as an example, where sub-bandwidth 1 and sub-bandwidth 2 are associated with multiple sets of DMRS ports respectively, when the DCI field indicates a value, the value corresponds to a set of DMRS ports (e.g., DMRS port 0, DMRS port 1) in the DMRS port indication table 1 associated with sub-bandwidth 1, and simultaneously corresponds to a set of DMRS ports (e.g., DMRS port 0) in the DMRS port indication table 2 associated with sub-bandwidth 2, thereby achieving the goal of one DCI field indicating the DMRS ports used on at least two sub-bandwidths.

[0204] In addition to associating different DMRS ports with different DMRS indication tables as described above, the default conventions of the protocol can also be used to indicate the DMRS ports used on at least two sub-bandwidths through a single DCI field. For example, if the value corresponds to DMRS ports 0, 1, 2, and 3 used on sub-bandwidth 1, then the default conventions of the protocol can be used, for example, to select certain DMRS ports used on sub-bandwidth 1 for sub-bandwidth 2. Optionally, the specific selection rules can also be indicated by other signaling (e.g., corresponding to the second signaling mentioned above) and / or by the default conventions of the protocol, such as selecting the first or last L DMRS ports. For example, the DMRS ports used on sub-bandwidth 2 are the last L = 2, namely DMRS ports 2 and 3.

[0205] Furthermore, the value corresponds to a group of DMRS ports on different sub-bandwidths, and the relationship between them is such that the number of DMRS ports used on different sub-bandwidths can be the same or different, and even the number of symbols occupied or the number of extra symbols can be different.

[0206] In some embodiments, the DMRS transmission method 200 further includes:

[0207] The terminal reports its capabilities.

[0208] The terminal capabilities include, but are not limited to, at least one of the following:

[0209] The terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources;

[0210] The terminal supports the DMRS having different first parameters corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths.

[0211] Optionally, different terminal capabilities can be assigned to different first parameters.

[0212] In this embodiment, the terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources. This allows for more flexible scheduling of DMRS on the network side, or more flexible allocation and utilization of DMRS resources on the network side, avoiding the limitations imposed by the first constraint condition. That is, the terminal may perform DMRS channel estimation based on its implementation, without needing to constrain the first frequency domain resources corresponding to the DMRS.

[0213] In this embodiment, the terminal supports different first parameters for DMRS on at least a portion of the sub-bandwidths in at least two sub-bandwidths. This allows the network side to configure the first parameters for DMRS on at least a portion of the sub-bandwidths in at least two sub-bandwidths in a targeted manner, thereby improving the channel estimation performance of DMRS transmission over a large bandwidth composed of multiple discrete frequency bands and better enhancing the transmission performance of the system.

[0214] The terminal-side embodiments of this application have been described in detail above with reference to Figures 2 to 7. The network-side embodiments of this application have been described in detail below with reference to Figure 8. It should be understood that the network-side embodiments correspond to the terminal-side embodiments, and similar descriptions can be referred to the terminal-side embodiments.

[0215] Figure 8 is a schematic flowchart of a DMRS transmission method 300 according to an embodiment of this application. As shown in Figure 8, the DMRS transmission method 300 may include at least some of the following:

[0216] S310, network-side devices transmit DMRS on at least two sub-bandwidths;

[0217] Wherein, the DMRS satisfies at least one of the following:

[0218] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0219] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0220] It should be understood that Figure 8 illustrates the steps or operations of the DMRS transmission method 300, but these steps or operations are merely examples, and other operations or variations of the operations in Figure 8 may also be performed in this application.

[0221] The transmission described in the embodiments of this application can be understood as sending and / or receiving. For example, the network-side device can send DMRS on at least two sub-bandwidths, and / or the network-side device can receive DMRS on at least two sub-bandwidths.

[0222] The sub-bandwidth described in the embodiments of this application may also be referred to as or replaced by carrier, band, frequency band, spectrum, etc., and this application is not limited thereto. The sub-bandwidth described in the embodiments of this application can be understood as a sub-bandwidth within a discrete large bandwidth.

[0223] At least a portion of the at least two sub-bandwidths described in the embodiments of this application are discrete sub-bandwidths, that is, there is an interval between the sub-bandwidths.

[0224] At least some of the sub-bandwidths in the at least two sub-bandwidths described in the embodiments of this application may come from different sub-bandwidth groups, or at least some of the sub-bandwidths in the at least two sub-bandwidths described in the embodiments of this application may come from the same sub-bandwidth group; wherein, a sub-bandwidth group may be a set of multiple adjacent sub-bandwidths.

[0225] When multiple discrete frequency bands are aggregated to form a large bandwidth, the intervals between these bands present new challenges in areas such as DMRS sequence design, DMRS resource scheduling, and DMRS port indication and usage, requiring targeted enhancements. In this embodiment, the network-side device transmits DMRS over at least two sub-bandwidths; wherein the DMRS satisfies at least one of the following: the first frequency domain resource corresponding to the DMRS satisfies a first constraint condition; and the first parameter corresponding to the DMRS differs in at least a portion of the at least two sub-bandwidths. This improves the performance and flexibility of transmitting DMRS over a large bandwidth composed of multiple discrete frequency bands, enhances DMRS channel estimation performance, and ultimately improves system transmission performance.

[0226] In some embodiments, the first frequency domain resource includes, but is not limited to, at least one of the following:

[0227] RB;

[0228] RB binding;

[0229] PRG;

[0230] BWP;

[0231] Sub-bandwidth;

[0232] A set of sub-bandwidths.

[0233] It should be noted that the set of sub-bandwidths described in the embodiments of this application can be any combination of sub-bandwidths, or it can include at least one group of sub-bandwidths.

[0234] Optionally, if the first frequency domain resource is a sub-bandwidth or a combination of sub-bandwidths, the first frequency domain resource may also include other sub-bandwidths besides the at least two sub-bandwidths. This application embodiment does not limit this.

[0235] In some embodiments, the first constraint includes, but is not limited to, at least one of the following:

[0236] The RB offset difference between the target RBs of at least a portion of the first frequency domain resources corresponding to the DMRS is an even number;

[0237] The number of RBs between the starting RB and the reference point of at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0238] The number of RBs corresponding to at least a portion of the first frequency domain resources of the DMRS is even;

[0239] The number of RBs between at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0240] The number of the first frequency domain resources corresponding to the DMRS is an even number;

[0241] The sequence mapping of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0242] The sequence generation of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0243] The mapping of the FD-OCC sequence corresponding to the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0244] The FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resource corresponding to the DMRS.

[0245] In this embodiment, to enable the terminal to perform correct channel estimation based on the FD-OCC sequence corresponding to the DMRS and to reduce the terminal's processing complexity, a first constraint condition is applied to constrain or limit the first frequency domain resources corresponding to the DMRS. This ensures that the FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resources corresponding to the DMRS, avoiding the occurrence of residual REs or subcarriers corresponding to the FD-OCC, i.e., isolated REs or isolated subcarriers, which are difficult to process. Furthermore, by constraining or limiting the first frequency domain resources corresponding to the DMRS through the first constraint condition, the network side can more flexibly instruct and use DMRS resources according to different service conditions or the different number of users residing on each sub-bandwidth. For example, different DMRS ports can be used on different sub-bandwidths to perform MU-MIMO scheduling on different sub-bandwidths, improving the overall system performance and capacity.

[0246] For example, by constraining or limiting the first frequency domain resources corresponding to the DMRS through the first constraint condition, it is ensured that the FD-OCC of length N on which the DMRS is based can be aligned with the first frequency domain resources, so that there will be no residual REs or subcarriers corresponding to the FD-OCC, that is, isolated REs or isolated subcarriers, which are difficult to process.

[0247] Optionally, the target RB can be the first RB in the first frequency domain resource, or the target RB can be the last RB in the first frequency domain resource, or the target RB can be a specific RB in the first frequency domain resource; wherein, the specific RB can be agreed upon by a protocol, or the specific RB can be configured by the network side.

[0248] Optionally, the reference point can be a common RB. For example, the reference point can be the first common RB, or the reference point can be reference point A, or the reference point can be the common RB where point A is located.

[0249] Optionally, aligning the FD-OCC sequence corresponding to the DMRS with the first frequency domain resource corresponding to the DMRS includes aligning the first code and / or the last code of the FD-OCC sequence corresponding to the DMRS with the boundary of the first frequency domain resource corresponding to the DMRS.

[0250] In some embodiments, the first parameter includes, but is not limited to, at least one of the following:

[0251] DMRS port;

[0252] Number of DMRS ports;

[0253] DMRS port index;

[0254] DMRS type;

[0255] OCC sequence;

[0256] CDM group;

[0257] Occupation symbol;

[0258] Additional symbols;

[0259] Starting position of the prefix symbol;

[0260] Transmission power;

[0261] The time-domain resource mapping type of the data channel corresponding to the DMRS.

[0262] Optionally, the OCC sequence includes at least one of the following: FD-OCC sequence, TD-OCC sequence.

[0263] Optionally, the data channel corresponding to the DMRS includes, but is not limited to, at least one of the following:

[0264] Uplink data channel (e.g., PUSCH), downlink data channel (e.g., PDSCH).

[0265] For example, the DMRS ports corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths are different (e.g., different numbers of DMRS ports and / or different DMRS port indices). The DMRS ports may be indicated by DCI, configured by RRC, or activated by MAC CE.

[0266] For example, the DMRS type may differ on at least a portion of the sub-bandwidths in at least two sub-bandwidths. For instance, there may be multiple DMRS types, each with a different DMRS pattern. The DMRS type may be indicated by DCI, activated by MAC CE, or configured by RRC.

[0267] For example, the time-domain resource mapping types of the data channels corresponding to the DMRS on at least a portion of the sub-bandwidths in at least two sub-bandwidths are different, such as TDRA Type A and TDRA Type B, and the time-domain resource locations of the DMRS corresponding to different time-domain resource mapping types are different. These different time-domain resource mapping types can be indicated by DCI, configured by RRC, or activated by MAC CE.

[0268] In this embodiment, for at least a portion of the at least two sub-bandwidths, the DMRS used on them can be different, not only in terms of the DMRS port, but also in terms of the time-frequency resources corresponding to the same DMRS port. For example, occupied symbols, extra symbols, the starting position of the pre-symbol, DMRS type, etc., will all result in different time-frequency resources.

[0269] In some embodiments, the DMRS transmission method 300 further includes:

[0270] The network-side device sends a first signaling message to the terminal;

[0271] The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

[0272] In this embodiment, the network-side device can use the first signaling to indicate the first parameter corresponding to each of the at least two sub-bandwidths of DMRS, thereby improving the performance of transmitting DMRS on a large bandwidth composed of multiple discrete frequency bands and better enhancing the transmission performance of the system.

[0273] Optionally, the first signaling can be DCI. It should be understood that the first signaling can also be other signaling, and this application is not limited to this.

[0274] In some embodiments, a field (such as a DCI field) in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths. For example, the first parameter is a DMRS port, wherein each DMRS port combination corresponds to a sub-bandwidth, or each DMRS port combination corresponds to a sub-bandwidth group, or each DMRS port combination corresponds to a set of sub-bandwidths.

[0275] In this embodiment, a field in the first signaling indicates a first parameter corresponding to at least two sub-bandwidths, thereby reducing the overhead of the first signaling.

[0276] In some embodiments, at least two fields (such as DCI fields) in the first signaling indicate the first parameter corresponding to at least one of the at least two sub-bandwidths. Optionally, when the number of the at least one sub-bandwidth is greater than or equal to 2, at least two fields in the first signaling indicate the first parameter corresponding to a group of sub-bandwidths, or at least two fields in the first signaling indicate the first parameter corresponding to a set of sub-bandwidths.

[0277] In some embodiments, at least two codepoints in a field (such as a DCI field) of the first signaling indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

[0278] It should be noted that the code points described in the embodiments of this application can also be referred to as or replaced by subdomains or subgroups.

[0279] In some embodiments, when an information field in the first signaling indicates the DMRS port corresponding to the at least two sub-bandwidths, the DMRS port corresponding to the at least two sub-bandwidths satisfies at least one of the following:

[0280] The number of DMRS ports corresponding to each sub-bandwidth in the at least two sub-bandwidths is the same, or the number of DMRS ports corresponding to each sub-bandwidth group in the at least two sub-bandwidths is the same;

[0281] The DMRS ports corresponding to at least some of the at least two sub-bandwidths are different, or the DMRS ports corresponding to at least some of the sub-bandwidth groups are different.

[0282] The DMRS ports corresponding to at least a portion of the at least two sub-bandwidths are associated with different DMRS port indication tables, or the DMRS ports corresponding to at least a portion of the at least two sub-bandwidth groups are associated with different DMRS port indication tables.

[0283] There is an inclusion relationship between the DMRS ports corresponding to at least some of the at least two sub-bandwidths, or there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths.

[0284] In this embodiment, when an information field in the first signaling indicates at least two DMRS ports corresponding to sub-bandwidths, the DMRS ports corresponding to at least two sub-bandwidths are constrained or limited, thereby improving the channel estimation performance of DMRS transmission over a large bandwidth composed of multiple discrete frequency bands, and thus better improving the transmission performance of the system.

[0285] In some embodiments, where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidths in the at least two sub-bandwidths, or where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths, the DMRS ports corresponding to the first sub-bandwidth in the at least two sub-bandwidths are a subset of the DMRS ports corresponding to the second sub-bandwidth in the at least two sub-bandwidths;

[0286] The method for determining the DMRS port in the subset includes at least one of the following: a protocol default agreement, indicated by a second signaling sent by the network-side device.

[0287] It should be understood that the at least two sub-bandwidths may include one or more first sub-bandwidths and one or more second sub-bandwidths, and this application embodiment is not limited in this respect.

[0288] Optionally, the first signaling and the second signaling can be of the same type or different, and this embodiment of the application does not limit this. For example, the second signaling can be RRC signaling.

[0289] Optionally, the function of the second signaling can also be achieved through the first signaling described above, that is, the first signaling can also be used to indicate the determination method of the DMRS ports in the subset.

[0290] In some embodiments, the DMRS transmission method 300 further includes:

[0291] The network-side device sends a third signaling message to the terminal;

[0292] The third signaling is used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0293] In this embodiment, the network-side device can use third signaling to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths, so that the terminal can transmit the DMRS based on the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0294] Optionally, the content indicated by the third signaling may include at least one of the following:

[0295] DMRS symbol, starting position of the prefix symbol, time-domain resource mapping type.

[0296] For example, different sub-bandwidths correspond to different DMRS symbols. In this case, the network-side device can indicate the DMRS symbol through third signaling, which can be DCI or RRC signaling.

[0297] For example, different sub-bandwidths correspond to different preamble start positions. In this case, the network-side device can indicate the preamble start position through third signaling, which can be DCI or RRC signaling.

[0298] For example, different sub-bandwidths correspond to different time-domain resource mapping types for PDSCH or PUSCH (i.e., TDRA Type A and TDRA Type B), and the time-domain resource locations of DMRS corresponding to different time-domain resource mapping types are different. The network-side device can indicate the time-domain resource mapping type via third signaling, which can be DCI, RRC, or MAC CE signaling.

[0299] Optionally, the first signaling, the second signaling, and the third signaling can be of the same type or different types, and this application embodiment does not limit this.

[0300] Optionally, the function of the third signaling can also be achieved through the first signaling mentioned above, that is, the first signaling can also be used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0301] In some embodiments, the DMRS transmission method 300 further includes:

[0302] The network-side device receives terminal capabilities from the terminal;

[0303] The terminal capabilities include at least one of the following:

[0304] The terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources;

[0305] The terminal supports the DMRS having different first parameters corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths.

[0306] Optionally, different terminal capabilities can be assigned to different first parameters.

[0307] In this embodiment, the terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources. This allows for more flexible scheduling of DMRS on the network side, or more flexible allocation and utilization of DMRS resources on the network side, avoiding the limitations imposed by the first constraint condition. That is, the terminal may perform DMRS channel estimation based on its implementation, without needing to constrain the first frequency domain resources corresponding to the DMRS.

[0308] In this embodiment, the terminal supports different first parameters for DMRS on at least a portion of the sub-bandwidths in at least two sub-bandwidths. This allows the network side to configure the first parameters for DMRS on at least a portion of the sub-bandwidths in at least two sub-bandwidths in a targeted manner, thereby improving the channel estimation performance of DMRS transmission over a large bandwidth composed of multiple discrete frequency bands and better enhancing the transmission performance of the system.

[0309] The DMRS transmission method provided in this application can be executed by a DMRS transmission device. This application uses an example of a DMRS transmission device executing the DMRS transmission method to illustrate the DMRS transmission device provided in this application.

[0310] This application provides a DMRS transmission device. As an example, the DMRS transmission device can be a communication device or a component within a communication device, such as a chip. The communication device can be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal can be, but is not limited to, the type of terminal 11 listed above, and the network-side device can be, but is not limited to, the type of network-side device 12 listed above. This application does not impose specific limitations.

[0311] The DMRS transmission device includes a receiving module, a transmitting module, and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, etc., such as central processing units (CPUs), microprocessors, digital signal processors (DSPs), artificial intelligence (AI) processors, graphics processing units (GPUs), application-specific integrated circuits (ASICs), network processors (NPs), field-programmable gate arrays (FPGAs), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving and transmitting modules can be implemented by a communication interface, which can include one or more of the following: transceivers, pins, circuits, buses, radio frequency units, etc.

[0312] Specifically, referring to Figure 9, when the DMRS transmission device is a terminal or a component in a terminal, the DMRS transmission device 400 includes: a transmitting module 401 and a receiving module 402;

[0313] The transmitting module 401 or the receiving module 402 is used to transmit the demodulation reference signal DMRS on at least two sub-bandwidths;

[0314] Wherein, the DMRS satisfies at least one of the following:

[0315] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0316] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0317] In some embodiments, the first frequency domain resource includes at least one of the following:

[0318] Resource block (RB);

[0319] RB binding;

[0320] Physical Resource Group (PRG);

[0321] Bandwidth portion BWP;

[0322] Sub-bandwidth;

[0323] A set of sub-bandwidths.

[0324] In some embodiments, the first constraint includes at least one of the following:

[0325] The RB offset difference between the target RBs of at least a portion of the first frequency domain resources corresponding to the DMRS is an even number;

[0326] The number of RBs between the starting RB and the reference point of at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0327] The number of RBs corresponding to at least a portion of the first frequency domain resources of the DMRS is even;

[0328] The number of RBs between at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0329] The number of the first frequency domain resources corresponding to the DMRS is an even number;

[0330] The sequence mapping of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0331] The sequence generation of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0332] The mapping of the frequency division orthogonal coverage code FD-OCC sequence corresponding to the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0333] The FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resource corresponding to the DMRS.

[0334] In some embodiments, the first parameter includes at least one of the following:

[0335] DMRS port;

[0336] Number of DMRS ports;

[0337] DMRS port index;

[0338] DMRS type;

[0339] Orthogonal covering code (OCC) sequence;

[0340] Code Division Multiplexing (CDM) groups;

[0341] Occupation symbol;

[0342] Additional symbols;

[0343] Starting position of the prefix symbol;

[0344] Transmission power;

[0345] The time-domain resource mapping type of the data channel corresponding to the DMRS.

[0346] In some embodiments, the receiving module 402 is further configured to receive a first signaling from a network-side device;

[0347] The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

[0348] In some embodiments, a field in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths; or...

[0349] At least two fields in the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths; or,

[0350] At least two code points in a field of the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

[0351] In some embodiments, when an information field in the first signaling indicates the DMRS port corresponding to the at least two sub-bandwidths, the DMRS port corresponding to the at least two sub-bandwidths satisfies at least one of the following:

[0352] The number of DMRS ports corresponding to each sub-bandwidth in the at least two sub-bandwidths is the same, or the number of DMRS ports corresponding to each sub-bandwidth group in the at least two sub-bandwidths is the same;

[0353] The DMRS ports corresponding to at least some of the at least two sub-bandwidths are different, or the DMRS ports corresponding to at least some of the sub-bandwidth groups are different.

[0354] The DMRS ports corresponding to at least a portion of the at least two sub-bandwidths are associated with different DMRS port indication tables, or the DMRS ports corresponding to at least a portion of the at least two sub-bandwidth groups are associated with different DMRS port indication tables.

[0355] There is an inclusion relationship between the DMRS ports corresponding to at least some of the at least two sub-bandwidths, or there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths.

[0356] In some embodiments, where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidths in the at least two sub-bandwidths, or where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths, the DMRS ports corresponding to the first sub-bandwidth in the at least two sub-bandwidths are a subset of the DMRS ports corresponding to the second sub-bandwidth in the at least two sub-bandwidths;

[0357] The method for determining the DMRS port in the subset includes at least one of the following: a protocol default agreement, indicated by a second signaling sent by the network-side device.

[0358] In some embodiments, the receiving module 402 is further configured to receive third signaling from a network-side device;

[0359] The third signaling is used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0360] In some embodiments, the sending module 401 is further configured to report terminal capabilities;

[0361] The terminal capabilities include at least one of the following:

[0362] The DMRS transmission device 400 supports the scheduling of the DMRS without being restricted by the first constraint condition of the first frequency domain resource.

[0363] The DMRS transmission device 400 supports the DMRS having different first parameters corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths.

[0364] Therefore, in this embodiment, the terminal transmits DMRS on at least two sub-bandwidths; wherein the DMRS satisfies at least one of the following: the first frequency domain resource corresponding to the DMRS satisfies a first constraint condition; the first parameter corresponding to the DMRS is different on at least a portion of the at least two sub-bandwidths. This improves the performance and flexibility of transmitting DMRS over a large bandwidth composed of multiple discrete frequency bands, enhances the channel estimation performance of the DMRS, and ultimately improves the system's transmission performance.

[0365] Specifically, referring to Figure 10, when the DMRS transmission device is a network-side device or a component in a network-side device, the DMRS transmission device 500 includes: a transmitting module 501 and a receiving module 502;

[0366] The transmitting module 501 or the receiving module 502 is used to transmit demodulation reference signal DMRS on at least two sub-bandwidths;

[0367] Wherein, the DMRS satisfies at least one of the following:

[0368] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0369] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0370] In some embodiments, the first frequency domain resource includes at least one of the following:

[0371] Resource block (RB);

[0372] RB binding;

[0373] Physical Resource Group (PRG);

[0374] Bandwidth portion BWP;

[0375] Sub-bandwidth;

[0376] A set of sub-bandwidths.

[0377] In some embodiments, the first constraint includes at least one of the following:

[0378] The RB offset difference between the target RBs of at least a portion of the first frequency domain resources corresponding to the DMRS is an even number;

[0379] The number of RBs between the starting RB and the reference point of at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0380] The number of RBs corresponding to at least a portion of the first frequency domain resources of the DMRS is even;

[0381] The number of RBs between at least a portion of the first frequency domain resources corresponding to the DMRS is even;

[0382] The number of the first frequency domain resources corresponding to the DMRS is an even number;

[0383] The sequence mapping of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0384] The sequence generation of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0385] The mapping of the frequency division orthogonal coverage code FD-OCC sequence corresponding to the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS;

[0386] The FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resource corresponding to the DMRS.

[0387] In some embodiments, the first parameter includes at least one of the following:

[0388] DMRS port;

[0389] Number of DMRS ports;

[0390] DMRS port index;

[0391] DMRS type;

[0392] Orthogonal covering code (OCC) sequence;

[0393] Code Division Multiplexing (CDM) groups;

[0394] Occupation symbol;

[0395] Additional symbols;

[0396] Starting position of the prefix symbol;

[0397] Transmission power;

[0398] The time-domain resource mapping type of the data channel corresponding to the DMRS.

[0399] In some embodiments, the sending module 501 is further configured to send a first signaling to the terminal;

[0400] The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

[0401] In some embodiments, a field in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths; or...

[0402] At least two fields in the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths; or,

[0403] At least two code points in a field of the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

[0404] In some embodiments, when an information field in the first signaling indicates the DMRS port corresponding to the at least two sub-bandwidths, the DMRS port corresponding to the at least two sub-bandwidths satisfies at least one of the following:

[0405] The number of DMRS ports corresponding to each sub-bandwidth in the at least two sub-bandwidths is the same, or the number of DMRS ports corresponding to each sub-bandwidth group in the at least two sub-bandwidths is the same;

[0406] The DMRS ports corresponding to at least some of the at least two sub-bandwidths are different, or the DMRS ports corresponding to at least some of the sub-bandwidth groups are different.

[0407] The DMRS ports corresponding to at least a portion of the at least two sub-bandwidths are associated with different DMRS port indication tables, or the DMRS ports corresponding to at least a portion of the at least two sub-bandwidth groups are associated with different DMRS port indication tables.

[0408] There is an inclusion relationship between the DMRS ports corresponding to at least some of the at least two sub-bandwidths, or there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths.

[0409] In some embodiments, where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidths in the at least two sub-bandwidths, or where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths, the DMRS ports corresponding to the first sub-bandwidth in the at least two sub-bandwidths are a subset of the DMRS ports corresponding to the second sub-bandwidth in the at least two sub-bandwidths;

[0410] The method for determining the DMRS port in the subset includes at least one of the following: a protocol default agreement, indicated by a second signaling sent by the network-side device.

[0411] In some embodiments, the sending module 501 is further configured to send a third signaling to the terminal;

[0412] The third signaling is used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

[0413] In some embodiments, the receiving module 502 is further configured to receive terminal capabilities from the terminal;

[0414] The terminal capabilities include at least one of the following:

[0415] The terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources;

[0416] The terminal supports the DMRS having different first parameters corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths.

[0417] Therefore, in this embodiment, the network-side device transmits DMRS on at least two sub-bandwidths; wherein the DMRS satisfies at least one of the following: the first frequency domain resource corresponding to the DMRS satisfies a first constraint condition; the first parameter corresponding to the DMRS is different on at least a portion of the at least two sub-bandwidths. This improves the performance and flexibility of transmitting DMRS over a large bandwidth composed of multiple discrete frequency bands, enhances the channel estimation performance of the DMRS, and ultimately improves the system's transmission performance.

[0418] The DMRS transmission device provided in this application embodiment can implement the various processes implemented in the method embodiments of Figures 2 to 8 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0419] As shown in Figure 11, this application embodiment also provides a communication device 600, including a processor 601 and a memory 602, wherein the memory 602 stores a program or instructions that can run on the processor 601.

[0420] For example, when the communication device 600 is a terminal, the program or instructions executed by the processor 601 implement the various steps executed by the terminal in the above DMRS transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0421] For example, when the communication device 600 is a network-side device, the program or instructions executed by the processor 601 implement the various steps executed by the network-side device in the above-described DMRS transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0422] This application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps in the method embodiments shown in Figures 2 to 7. This terminal embodiment corresponds to the above-described terminal-side method embodiments, and all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and achieve the same technical effect. The terminal may be the DMRS transmission device 400 shown in Figure 9. Specifically, Figure 12 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of this application.

[0423] The terminal 700 includes, but is not limited to, at least some of the following components: radio frequency unit 701, network module 702, audio output unit 703, input unit 704, sensor 705, display unit 706, user input unit 707, interface unit 708, memory 709, and processor 710.

[0424] Those skilled in the art will understand that the terminal 700 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to the processor 710 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 12 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0425] It should be understood that, in this embodiment, the input unit 704 may include a graphics processor 7041 and a microphone 7042. The graphics processor 7041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 706 may include a display panel 7061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 707 includes at least one of a touch panel 7071 and other input devices 7072. The touch panel 7071 is also called a touch screen. The touch panel 7071 may include a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0426] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 701 can transmit it to the processor 710 for processing; in addition, the radio frequency unit 701 can send uplink data to the network-side device. Typically, the radio frequency unit 701 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0427] The memory 709 can be used to store software programs or instructions, as well as various data. The memory 709 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 709 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can 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), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 709 in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0428] Processor 710 may include one or more processing units; optionally, processor 710 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 710.

[0429] The radio frequency unit 701 is used to transmit demodulation reference signal DMRS on at least two sub-bandwidths;

[0430] Wherein, the DMRS satisfies at least one of the following:

[0431] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0432] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0433] Therefore, in this embodiment, the terminal transmits DMRS on at least two sub-bandwidths; wherein the DMRS satisfies at least one of the following: the first frequency domain resource corresponding to the DMRS satisfies a first constraint condition; the first parameter corresponding to the DMRS is different on at least a portion of the at least two sub-bandwidths. This improves the performance and flexibility of transmitting DMRS over a large bandwidth composed of multiple discrete frequency bands, enhances the channel estimation performance of the DMRS, and ultimately improves the system's transmission performance.

[0434] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the method embodiment and achieve the same or corresponding technical effect. To avoid repetition, it will not be described again here.

[0435] This application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the method embodiment shown in FIG8. This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this network-side device embodiment and can achieve the same technical effect.

[0436] Specifically, this application embodiment also provides a network-side device, which may be the DMRS transmission device 500 shown in FIG10. As shown in FIG13, the network-side device 800 includes: an antenna 81, a radio frequency device 82, a baseband device 83, a processor 84, and a memory 85. The antenna 81 is connected to the radio frequency device 82. In the uplink direction, the radio frequency device 82 receives information through the antenna 81 and sends the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes the information to be transmitted and sends it to the radio frequency device 82. The radio frequency device 82 processes the received information and transmits it through the antenna 81.

[0437] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 83, which includes a baseband processor.

[0438] The baseband device 83 may include at least one baseband board, on which multiple chips are disposed, as shown in FIG13. One of the chips is, for example, a baseband processor, which is connected to the memory 85 via a bus interface to call the program or instructions in the memory 85 to execute the network-side device operation shown in the above method embodiment.

[0439] The network-side device may also include a network interface 86, such as a Common Public Radio Interface (CPRI).

[0440] The radio frequency device 82 is used to transmit the demodulation reference signal DMRS over at least two sub-bandwidths;

[0441] Wherein, the DMRS satisfies at least one of the following:

[0442] The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition;

[0443] The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

[0444] In addition, the network-side device 800 of this application embodiment also includes: a program or instructions stored in a memory 85 and executable on a processor 84. The processor 84 calls the program or instructions in the memory 85 to execute the methods executed by each module shown in FIG10 and achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0445] Therefore, in this embodiment, the network-side device transmits DMRS on at least two sub-bandwidths; wherein the DMRS satisfies at least one of the following: the first frequency domain resource corresponding to the DMRS satisfies a first constraint condition; the first parameter corresponding to the DMRS is different on at least a portion of the at least two sub-bandwidths. This improves the performance and flexibility of transmitting DMRS over a large bandwidth composed of multiple discrete frequency bands, enhances the channel estimation performance of the DMRS, and ultimately improves the system's transmission performance.

[0446] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described DMRS transmission method embodiments and achieve the same technical effects. To avoid repetition, they will not be described again here.

[0447] The processor mentioned above is either the processor in the terminal described in the above embodiments or the processor in the network-side device. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0448] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described DMRS transmission method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0449] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0450] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described DMRS transmission method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0451] This application also provides a wireless communication system, including: a terminal and a network-side device. The terminal can be used to perform the steps executed by the terminal in the DMRS transmission method described above, and the network-side device can be used to perform the steps executed by the network-side device in the DMRS transmission method described above.

[0452] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0453] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.), and the computer software product includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0454] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A DMRS transmission method, comprising: The terminal transmits the demodulation reference signal DMRS on at least two sub-bandwidths; Wherein, the DMRS satisfies at least one of the following: The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition; The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

2. The method according to claim 1, wherein, The first frequency domain resource includes at least one of the following: Resource block (RB); RB binding; Physical Resource Group (PRG); Bandwidth portion BWP; Sub-bandwidth; A set of sub-bandwidths.

3. The method according to claim 1 or 2, wherein, The first constraint includes at least one of the following: The RB offset difference between the target RBs of at least a portion of the first frequency domain resources corresponding to the DMRS is an even number; The number of RBs between the starting RB and the reference point of at least a portion of the first frequency domain resources corresponding to the DMRS is even; The number of RBs corresponding to at least a portion of the first frequency domain resources of the DMRS is even; The number of RBs between at least a portion of the first frequency domain resources corresponding to the DMRS is even; The number of the first frequency domain resources corresponding to the DMRS is an even number; The sequence mapping of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The sequence generation of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The mapping of the frequency division orthogonal coverage code FD-OCC sequence corresponding to the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resource corresponding to the DMRS.

4. The method according to any one of claims 1 to 3, wherein, The first parameter includes at least one of the following: DMRS port; Number of DMRS ports; DMRS port index; DMRS type; Orthogonal covering code (OCC) sequence; Code Division Multiplexing (CDM) groups; Occupation symbol; Additional symbols; Starting position of the prefix symbol; Transmission power; The time-domain resource mapping type of the data channel corresponding to the DMRS.

5. The method according to any one of claims 1 to 4, wherein, The method further includes: The terminal receives the first signaling from the network-side device; The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

6. The method according to claim 5, wherein, A field in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths; or, At least two fields in the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths; or, At least two code points in a field of the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

7. The method according to claim 6, wherein, When an information field in the first signaling indicates the DMRS port corresponding to the at least two sub-bandwidths, the DMRS port corresponding to the at least two sub-bandwidths satisfies at least one of the following: The number of DMRS ports corresponding to each sub-bandwidth in the at least two sub-bandwidths is the same, or the number of DMRS ports corresponding to each sub-bandwidth group in the at least two sub-bandwidths is the same; The DMRS ports corresponding to at least some of the at least two sub-bandwidths are different, or the DMRS ports corresponding to at least some of the sub-bandwidth groups are different. The DMRS ports corresponding to at least a portion of the at least two sub-bandwidths are associated with different DMRS port indication tables, or the DMRS ports corresponding to at least a portion of the at least two sub-bandwidth groups are associated with different DMRS port indication tables. There is an inclusion relationship between the DMRS ports corresponding to at least some of the at least two sub-bandwidths, or there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths.

8. The method according to claim 7, wherein, In the case where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidths in the at least two sub-bandwidths, or in the case where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths, the DMRS ports corresponding to the first sub-bandwidth in the at least two sub-bandwidths are a subset of the DMRS ports corresponding to the second sub-bandwidth in the at least two sub-bandwidths; The method for determining the DMRS port in the subset includes at least one of the following: a protocol default agreement, indicated by a second signaling sent by the network-side device.

9. The method according to any one of claims 1 to 8, wherein, The method further includes: The terminal receives third signaling from the network-side device; The third signaling is used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

10. The method according to any one of claims 1 to 9, wherein, The method further includes: The terminal reports its capabilities. The terminal capabilities include at least one of the following: The terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources; The terminal supports the DMRS having different first parameters corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths.

11. A DMRS transmission method, comprising: Network-side devices transmit demodulation reference signals (DMRS) on at least two sub-bandwidths; Wherein, the DMRS satisfies at least one of the following: The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition; The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

12. The method according to claim 11, wherein, The first frequency domain resource includes at least one of the following: Resource block (RB); RB binding; Physical Resource Group (PRG); Bandwidth portion BWP; Sub-bandwidth; A set of sub-bandwidths.

13. The method according to claim 11 or 12, wherein, The first constraint includes at least one of the following: The RB offset difference between the target RBs of at least a portion of the first frequency domain resources corresponding to the DMRS is an even number; The number of RBs between the starting RB and the reference point of at least a portion of the first frequency domain resources corresponding to the DMRS is even; The number of RBs corresponding to at least a portion of the first frequency domain resources of the DMRS is even; The number of RBs between at least a portion of the first frequency domain resources corresponding to the DMRS is even; The number of the first frequency domain resources corresponding to the DMRS is an even number; The sequence mapping of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The sequence generation of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The mapping of the frequency division orthogonal coverage code FD-OCC sequence corresponding to the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resource corresponding to the DMRS.

14. The method according to any one of claims 11 to 13, wherein, The first parameter includes at least one of the following: DMRS port; Number of DMRS ports; DMRS port index; DMRS type; Orthogonal covering code (OCC) sequence; Code Division Multiplexing (CDM) groups; Occupation symbol; Additional symbols; Starting position of the prefix symbol; Transmission power; The time-domain resource mapping type of the data channel corresponding to the DMRS.

15. The method according to any one of claims 11 to 14, wherein, The method further includes: The network-side device sends a first signaling message to the terminal; The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

16. The method according to claim 15, wherein, A field in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths; or, At least two fields in the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths; or, At least two code points in a field of the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

17. The method according to claim 16, wherein, When an information field in the first signaling indicates the DMRS port corresponding to the at least two sub-bandwidths, the DMRS port corresponding to the at least two sub-bandwidths satisfies at least one of the following: The number of DMRS ports corresponding to each sub-bandwidth in the at least two sub-bandwidths is the same, or the number of DMRS ports corresponding to each sub-bandwidth group in the at least two sub-bandwidths is the same; The DMRS ports corresponding to at least some of the at least two sub-bandwidths are different, or the DMRS ports corresponding to at least some of the sub-bandwidth groups are different. The DMRS ports corresponding to at least a portion of the at least two sub-bandwidths are associated with different DMRS port indication tables, or the DMRS ports corresponding to at least a portion of the at least two sub-bandwidth groups are associated with different DMRS port indication tables. There is an inclusion relationship between the DMRS ports corresponding to at least some of the at least two sub-bandwidths, or there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths.

18. The method according to claim 17, wherein, In the case where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidths in the at least two sub-bandwidths, or in the case where there is an inclusion relationship between the DMRS ports corresponding to at least some of the sub-bandwidth groups in the at least two sub-bandwidths, the DMRS ports corresponding to the first sub-bandwidth in the at least two sub-bandwidths are a subset of the DMRS ports corresponding to the second sub-bandwidth in the at least two sub-bandwidths; The method for determining the DMRS port in the subset includes at least one of the following: a protocol default agreement, indicated by a second signaling sent by the network-side device.

19. The method according to any one of claims 11 to 18, wherein, The method further includes: The network-side device sends a third signaling message to the terminal; The third signaling is used to indicate the time-frequency resources occupied by the DMRS on each of the at least two sub-bandwidths.

20. The method according to any one of claims 11 to 19, wherein, The method further includes: The network-side device receives terminal capabilities from the terminal; The terminal capabilities include at least one of the following: The terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources; The terminal supports the DMRS having different first parameters corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths.

21. A DMRS transmission device, comprising: Sending module and receiving module; The transmitting module or the receiving module is used to transmit a demodulation reference signal (DMRS) over at least two sub-bandwidths; Wherein, the DMRS satisfies at least one of the following: The first frequency domain resource corresponding to the DMRS satisfies the first constraint condition; The first parameter of the DMRS is different on at least a portion of the at least two sub-bandwidths.

22. The apparatus according to claim 21, wherein, The first constraint includes at least one of the following: The RB offset difference between the target RBs of at least a portion of the first frequency domain resources corresponding to the DMRS is an even number; The number of RBs between the starting RB and the reference point of at least a portion of the first frequency domain resources corresponding to the DMRS is even; The number of RBs corresponding to at least a portion of the first frequency domain resources of the DMRS is even; The number of RBs between at least a portion of the first frequency domain resources corresponding to the DMRS is even; The number of the first frequency domain resources corresponding to the DMRS is an even number; The sequence mapping of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The sequence generation of the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The mapping of the frequency division orthogonal coverage code FD-OCC sequence corresponding to the DMRS starts from the first RB of the first frequency domain resource corresponding to the DMRS; The FD-OCC sequence corresponding to the DMRS is aligned with the first frequency domain resource corresponding to the DMRS.

23. The apparatus according to claim 21 or 22, wherein, The first parameter includes at least one of the following: DMRS port; Number of DMRS ports; DMRS port index; DMRS type; Orthogonal covering code (OCC) sequence; Code Division Multiplexing (CDM) groups; Occupation symbol; Additional symbols; Starting position of the prefix symbol; Transmission power; The time-domain resource mapping type of the data channel corresponding to the DMRS.

24. The apparatus according to any one of claims 21 to 23, wherein, The receiving module is also used to receive first signaling from network-side equipment; The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

25. The apparatus according to claim 24, wherein, A field in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths; or, At least two fields in the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths; or, At least two code points in a field of the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

26. The apparatus according to any one of claims 21 to 25, wherein, The sending module is also used to report terminal capabilities; The terminal capabilities include at least one of the following: The DMRS transmission device supports the scheduling of the DMRS without being restricted by the first constraint condition of the first frequency domain resource. The DMRS transmission device supports the DMRS having different first parameters corresponding to at least a portion of the at least two sub-bandwidths.

27. The apparatus according to any one of claims 21 to 23, wherein, The sending module is also used to send a first signaling to the terminal; The first signaling is used to indicate the first parameter corresponding to the DMRS on each of the at least two sub-bandwidths.

28. The apparatus according to claim 27, wherein, A field in the first signaling indicates the first parameter corresponding to the at least two sub-bandwidths; or, At least two fields in the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths; or, At least two code points in a field of the first signaling respectively indicate the first parameter corresponding to at least one of the at least two sub-bandwidths.

29. The apparatus according to any one of claims 21 to 23, 27, and 28, wherein, The receiving module is also used to receive terminal capabilities from the terminal; The terminal capabilities include at least one of the following: The terminal supports DMRS scheduling without being restricted by the first constraint condition of the first frequency domain resources; The terminal supports the DMRS having different first parameters corresponding to at least a portion of the sub-bandwidths in at least two sub-bandwidths.

30. A terminal comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the DMRS transmission method as claimed in any one of claims 1 to 10.

31. A network-side device, wherein, It includes a processor and a memory, the memory storing programs or instructions that can run on the processor, the programs or instructions being executed by the processor to implement the steps of the DMRS transmission method as described in any one of claims 11 to 20.

32. A readable storage medium storing a program or instructions that, when executed by a processor, implement the DMRS transmission method as claimed in any one of claims 1 to 10, or implement the steps of the DMRS transmission method as claimed in any one of claims 11 to 20.

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