Transmission methods for tracking reference signal, apparatus and device

Abstract

The present application belongs to the field of communications. Disclosed are transmission methods for a tracking reference signal, an apparatus and a device. A transmission method for a tracking reference signal (TRS) in the embodiments of the present application comprises: a terminal receives at least one TRS; and the terminal performs time-frequency tracking on the basis of the at least one TRS, wherein the TRS satisfies at least one of the following: the TRS occupies at least one first time domain unit and at least one second time domain unit, the second time domain unit containing at least one of the first time domain units; the TRS corresponds to at least one first sequence, the first sequence being used for multiplexing the TRS; the TRS corresponds to at least one first frequency domain range; and the TRS corresponds to at least one repetition. The embodiments of the present application design a more flexible TRS, and can improve the time-frequency tracking performance of the TRS and reduce the resource overheads of the TRS.

Description

Method, device and equipment for transmitting tracking reference signal

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on January 31, 2024, with application number 202410141248.3 and invention name “Transmission method, device and equipment for tracking reference signal”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communications, and more specifically, to a method, apparatus, and device for transmitting a tracking reference signal. Background Art

[0004] The New Radio (NR) system introduces a Tracking Reference Signal (TRS). Terminals can use TRS to perform time-frequency tracking, including measuring parameters such as timing, delay spread, frequency offset, and Doppler spread. However, for future communication scenarios (such as 6G communications), such as those with higher mobile speeds and large bandwidths, the current TRS measurement performance and overhead may not be sufficient. Improving TRS transmission performance is a challenge that needs to be addressed. Summary of the Invention

[0005] The embodiments of the present application provide a method, apparatus, and device for transmitting a tracking reference signal, which can solve the problem of insufficient TRS transmission performance at the current stage.

[0006] In a first aspect, a method for transmitting a tracking reference signal is provided, comprising:

[0007] The terminal receives at least one tracking reference signal TRS;

[0008] The terminal performs time-frequency tracking based on the at least one TRS;

[0009] The TRS satisfies at least one of the following:

[0010] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0011] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0012] The TRS corresponds to at least one first frequency domain range;

[0013] The TRS corresponds to at least one repeat.

[0014] In a second aspect, a method for transmitting a tracking reference signal is provided, including:

[0015] The network side device sends at least one tracking reference signal TRS;

[0016] wherein the at least one TRS is used for time-frequency tracking;

[0017] The TRS satisfies at least one of the following:

[0018] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0019] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0020] The TRS corresponds to at least one first frequency domain range;

[0021] The TRS corresponds to at least one repeat.

[0022] According to a third aspect, a transmission apparatus for a tracking reference signal is provided, comprising:

[0023] a transceiver unit, configured to receive at least one tracking reference signal TRS;

[0024] a processing unit, configured to perform time-frequency tracking based on the at least one TRS;

[0025] The TRS satisfies at least one of the following:

[0026] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0027] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0028] The TRS corresponds to at least one first frequency domain range;

[0029] The TRS corresponds to at least one repeat.

[0030] In a fourth aspect, a transmission device for a tracking reference signal is provided, including:

[0031] a transceiver unit, configured to send at least one tracking reference signal TRS;

[0032] The TRS satisfies at least one of the following:

[0033] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0034] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0035] The TRS corresponds to at least one first frequency domain range;

[0036] The TRS corresponds to at least one repeat.

[0037] In a fifth aspect, a terminal is provided, comprising a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0038] In a sixth aspect, a terminal is provided, comprising a processor and a communication interface;

[0039] The communication interface is configured to receive at least one tracking reference signal (TRS); and the processor is configured to perform time-frequency tracking based on the at least one TRS.

[0040] The TRS satisfies at least one of the following:

[0041] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0042] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0043] The TRS corresponds to at least one first frequency domain range;

[0044] The TRS corresponds to at least one repeat.

[0045] In the seventh aspect, a network side device is provided, which includes a transceiver, a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0046] In an eighth aspect, a network-side device is provided, including a processor and a communication interface;

[0047] Wherein, the communication interface is used to send at least one tracking reference signal TRS;

[0048] The TRS satisfies at least one of the following:

[0049] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0050] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0051] The TRS corresponds to at least one first frequency domain range;

[0052] The TRS corresponds to at least one repeat.

[0053] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0054] In the tenth aspect, a wireless communication system is provided, including: a terminal and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, and the network side device can be used to execute the steps of the method described in the second aspect.

[0055] In the eleventh aspect, a chip is provided, which includes 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 method as described in the first aspect, or to implement the method as described in the second aspect.

[0056] In the twelfth 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 method for transmitting a tracking reference signal as described in the first aspect or the second aspect.

[0057] In an embodiment of the present application, the TRS satisfies at least one of the following: the TRS occupies at least one first time domain unit and at least one second time domain unit, the TRS corresponds to at least one first sequence, the TRS corresponds to at least one first frequency domain range, and the TRS corresponds to at least one repetition. Specifically, the embodiment of the present application designs a more flexible TRS based on at least one aspect of the time domain, frequency domain, and code domain, which can improve the time-frequency tracking performance of the TRS and reduce the resource overhead of the TRS. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0059] FIG1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

[0060] FIG2 is a schematic diagram of a TRS structure provided in this application.

[0061] FIG3 is a schematic flowchart of a method for transmitting a tracking reference signal according to an embodiment of the present application.

[0062] 4 to 9 are schematic diagrams of TRS resources provided according to embodiments of the present application.

[0063] FIG10 is a schematic block diagram of a device for transmitting a tracking reference signal according to an embodiment of the present application.

[0064] FIG11 is a schematic block diagram of another apparatus for transmitting a tracking reference signal according to an embodiment of the present application.

[0065] FIG12 is a schematic block diagram of a communication device provided according to an embodiment of the present application.

[0066] FIG13 is a schematic diagram of the hardware structure of a terminal provided according to an embodiment of the present application.

[0067] FIG14 is a schematic block diagram of a network-side device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0069] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0070] 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 operation to be performed, or the requested result, etc. 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 operation to be performed or the requested result based on the judgment result.

[0071] It is worth noting that the technology described in the embodiments of the present application is not limited to the Internet of Things (IoT) system, but can also be used in other wireless communication systems, such as Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, 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), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), Bluetooth systems, or other systems. In the embodiments of the present application, the terms "system" and "network" are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these techniques can also be applied to systems other than NR systems, such as 6G (6 th Generation, 6G) communication system.

[0072] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer, a laptop computer, a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device, an aircraft (flight vehicle), a vehicle user equipment (VUE), a ship-borne device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), a teller machine, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, vehicle-mounted controller, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application.

[0073] The network side device 12 may include an access network device or a core network device.

[0074] Access network equipment can also be referred to as radio access network (RAN) equipment, radio access network functions, or radio access network units. Access network equipment can include base stations, wireless local area network (WLAN) access points (AS), or wireless fidelity (WiFi) nodes. Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the 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 (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the relevant field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0075] Among them, the core network equipment may include but is not limited to at least one of the following: core network node, core network function, mobility management entity (MME), access mobility management function (AMF), session management function (SMF), user plane function (UPF), policy control function (PCF), policy and charging rules function unit (PCRF), edge application service discovery function (EASDF), unified data management (UDM), unified data repository (UDR), home user server (HSS), centralized network configuration (CNC), network storage function (NRF), network exposure function (NEF), local NEF (L-NEF), binding support function (BSF), application function ( Function, AF), Network Data Analytics Function (NWDAF), Location Management Function (LMF), etc. It should be noted that in the embodiment of the present application, only the core network device in the NR system is introduced as an example, and the specific type of the core network device is not limited.

[0076] To facilitate a better understanding of the embodiments of the present application, a tracking reference signal (TRS) is described.

[0077] In the NR system, TRS is used for time-frequency tracking, that is, to perform timing estimation, delay spread estimation, frequency offset estimation, and Doppler spread estimation. Timing estimation and frequency offset estimation can be used to synchronize the transmitter and receiver. The results of delay spread estimation and Doppler spread estimation are important parameters for channel estimation, which can be used to assist the demodulation reference signal (DMRS) of the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) to achieve more accurate channel estimation. TRS can be used for terminals (UEs) in the Radio Resource Control (RRC) connected state, that is, when the UE enters the RRC connected state, the time-frequency tracking performance is further adjusted based on the original synchronization signal block (SSB). TRS can also be used for time-frequency tracking of UEs in the non-connected state.

[0078] TRS is a special set of Channel State Information Reference Signal (CSI-RS) resources. For TRS deployed on FR1 (low frequency), a UE can configure one or more TRS resource sets. Each TRS resource set contains 4 CSI-RS resources. These 4 CSI-RS resources exist in two consecutive time slots, and there are 2 CSI-RS resources in each time slot; for TRS deployed on FR2 (high frequency), a UE can also configure one or more TRS resource sets. Among them, the CSI-RS resources contained in a TRS resource set may only exist in one time slot. In this case, there are only 2 CSI-RS resources; and a TRS resource set can also contain 4 CSI-RS resources, which are distributed in pairs in two consecutive time slots. NR supports periodic and non-periodic TRS. For periodic TRS, the period optional value is 2. μ [10, 20, 40, 80] slots, where 2 μ Related to the subcarrier spacing. In the frequency domain, the bandwidth of a TRS can be either the Band Width Part (BWP) or min(52, BWP).

[0079] Assume that TRS is deployed in FR1, with a period of 20 slots, an offset of 5 slots within the period, and the distribution of TRS symbols within a slot is l∈{4,8}. The deployed BWP bandwidth is 20 MHz, and the subcarrier spacing (SCS) is 15 kHz. In the frequency domain, the number of resource blocks (RBs) containing TRS is 52. The time-frequency mapping of TRS is shown in Figure 2.

[0080] To facilitate a better understanding of the embodiments of the present application, Quasi Co-Location (QCL) is described below.

[0081] In NR systems, QCL refers to the average channel delay, delay spread, Doppler frequency offset, Doppler spread, and spatial reception parameters experienced by a symbol at one antenna port. These parameters can be inferred from another antenna port. NR has designed four different QCL relationships to address different transmission scenarios.

[0082] The specific QCL reference types (qcl-Type) are as follows:

[0083] 1) Type A: {Doppler frequency deviation, Doppler spread, average delay, delay spread};

[0084] 2) Type B: {Doppler frequency deviation, Doppler spread};

[0085] 3) Type C: {Doppler frequency deviation, average delay};

[0086] 4) TypeD: {space receiving parameters}.

[0087] Before the RRC connection state, the reference source for the QCL reference Type A transmitted by PDCCH and PDSCH is SSB. After the terminal enters the RRC connection state, in order to obtain more refined time-frequency tracking performance, the network side can configure TRS for time-frequency synchronization. In this case, the reference source for the QCL reference Type A transmitted by PDCCH and PDSCH is TRS.

[0088] The SSB described in this application can be used interchangeably with the synchronization signal / physical broadcast signal block (SS / PBCH block), and can also be called any information block or resource block that contains at least one of a synchronization signal, a broadcast signal, a broadcast channel, other system messages, and a downlink broadcast channel.

[0089] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and all of them fall within the scope of protection of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0090] FIG3 is a schematic flowchart of a method 200 for transmitting a tracking reference signal according to an embodiment of the present application. As shown in FIG3 , the method 200 for transmitting a tracking reference signal may include at least part of the following contents:

[0091] S210: The network-side device sends at least one TRS; wherein the TRS satisfies at least one of the following conditions: the TRS occupies at least one first time domain unit and at least one second time domain unit, the second time domain unit including at least one of the first time domain units; the TRS corresponds to at least one first sequence, the first sequence being used for multiplexing of the TRS; the TRS corresponds to at least one first frequency domain range; and the TRS corresponds to at least one repetition.

[0092] S220, the terminal receives the at least one TRS;

[0093] S230: The terminal performs time-frequency tracking based on the at least one TRS.

[0094] It should be understood that FIG3 shows the steps or operations of the method 200 for transmitting a tracking reference signal, but these steps or operations are merely examples, and the present application may also perform other operations or variations of the operations in FIG3 .

[0095] The TRS described in the embodiment of the present application may be composed of one or more first resources; when the TRS is composed of one first resource, the TRS is a resource block / burst; when the TRS is composed of multiple first resources, the TRS is a resource set. Optionally, the first resource may be a CSI-RS resource.

[0096] Exemplarily, the first time domain unit may be a symbol, and the second time domain unit may be a time slot.

[0097] When the TRS occupies multiple (including two) first time domain units: if the TRS is composed of one first resource, then it can be understood that the first resource occupies multiple first time domain units; if the TRS is composed of multiple (including two) first resources, then it can be understood that each first resource corresponds to one or more first time domain units, for example, one CSI-RS resource corresponds to one symbol.

[0098] When the TRS occupies multiple (including two) second time domain units: if the TRS is composed of one first resource, then it can be understood that the first resource occupies multiple second time domain units; if the TRS is composed of multiple (including two) first resources, then it can be understood that each second time domain unit contains one or more first resources, for example, 1 time slot contains multiple CSI-RS resources.

[0099] In the embodiment of the present application, TRS occupies at least one first time domain unit, which can be understood as TRS occupying part or all of at least one first time domain unit. Similarly, TRS occupies at least one second time domain unit, which can be understood as TRS occupying part or all of at least one second time domain unit.

[0100] It should be noted that the current TRS design has some limitations, which may lead to insufficient performance and high overhead when used in scenarios with higher mobile speeds (for example, greater than or equal to 500km / h) and larger bandwidths. For example, since the current TRS occupies a maximum of 2 consecutive time slots and two symbols in each time slot, its measurement performance for parameters such as Doppler spread needs to be further optimized. For another example, the density of the current TRS in the frequency domain is fixed at 1 / 4, that is, each resource block (RB) occupies 3 resource elements (RE). For scenarios with large bandwidth and low latency, the overall overhead of TRS will be large.

[0101] In an embodiment of the present application, the TRS satisfies at least one of the following: the TRS occupies at least one first time domain unit and at least one second time domain unit, the TRS corresponds to at least one first sequence, the TRS corresponds to at least one first frequency domain range, and the TRS corresponds to at least one repetition. Specifically, the embodiment of the present application designs a more flexible TRS based on at least one aspect of the time domain, frequency domain, and code domain, which can improve the time-frequency tracking performance of the TRS and reduce the resource overhead of the TRS.

[0102] For example, TRS occupies at least one first time domain unit and at least one second time domain unit, that is, a more flexible TRS is designed in the time domain, which can increase the time domain span of TRS or the number of occupied time domain resources, thereby improving the time-frequency tracking performance of TRS (such as the measurement performance of parameters such as Doppler spread), and can also reduce the overall resource overhead of TRS. It can be applied to scenarios such as high mobile speed (for example, greater than or equal to 500km / h), low latency, and large bandwidth.

[0103] Specifically, for example, TRS corresponds to at least one first sequence, that is, a more flexible TRS is designed in the code domain, and TRS can be transmitted by code division multiplexing (CDM), thereby reducing the overall resource overhead of TRS in the network. For example, TRS of multiple users can be multiplexed on the same time-frequency resources by CDM, which can be suitable for scenarios such as high mobile speed (for example, greater than or equal to 500 km / h), low latency, and large bandwidth.

[0104] For example, TRS corresponds to at least one first frequency domain range, that is, a more flexible TRS is designed in the frequency domain, which can increase the flexibility of TRS distribution, thereby improving the time-frequency tracking performance of TRS, and reducing the overall resource overhead of TRS. It can be suitable for scenarios such as high mobile speed (for example, greater than or equal to 500km / h), low latency, and large bandwidth.

[0105] For example, TRS corresponds to at least one repetition; for example, repetition in the time domain can increase the time domain span of TRS, thereby improving the time-frequency tracking performance of TRS (such as the measurement performance of parameters such as Doppler spread), which can be applied to scenarios such as high mobile speed (for example, greater than or equal to 500km / h), low latency, and large bandwidth; for another example, repetition in the frequency domain can increase the frequency domain span of TRS, thereby improving the time-frequency tracking performance of TRS (such as the measurement performance of parameters such as delay spread), which can be applied to scenarios such as high mobile speed (for example, greater than or equal to 500km / h), low latency, and large bandwidth.

[0106] In some embodiments, when the TRS occupies multiple (including two) first time domain units, the first parameters of the TRS in the multiple first time domain units are all the same or at least partially different;

[0107] The first parameter includes but is not limited to at least one of the following:

[0108] Frequency domain density;

[0109] Occupied frequency domain resources;

[0110] Time domain density;

[0111] Occupied time domain resources;

[0112] Transmission power.

[0113] In this embodiment, the first parameters of the TRS can be flexibly designed on multiple first time domain units.

[0114] In some embodiments, when the frequency domain density of the TRS on multiple first time domain units (such as symbols) is at least partially different, the frequency domain density of the TRS satisfies at least one of the following:

[0115] The frequency domain density corresponding to the first time domain position is lower than the frequency domain density corresponding to the first time domain position;

[0116] There is a multiple relationship between corresponding frequency domain densities on at least some of the first time domain units (such as symbols);

[0117] There is a multiple relationship between the corresponding frequency domain densities on at least some of the second time domain units (such as time slots).

[0118] In this embodiment, the existence of a multiple relationship between the frequency domain densities corresponding to at least part of the first time domain units (such as symbols) is beneficial to the joint measurement of TRS, or the existence of a multiple relationship between the frequency domain densities corresponding to at least part of the second time domain units (such as time slots) is beneficial to the joint measurement of TRS.

[0119] Illustratively, the first time domain position may be a first time domain unit or a second time domain unit, or the first time domain position may be a specific position on a first time domain unit or a second time domain unit.

[0120] Exemplarily, the frequency domain density of the TRS corresponding to the first time domain unit i is N1 times the frequency domain density of the TRS corresponding to the first time domain unit j, where N1 is a positive number. For example, the first time domain unit i is located before the first time domain unit i.

[0121] Exemplarily, the frequency domain density of the TRS corresponding to the second time domain unit i is N2 times the frequency domain density of the TRS corresponding to the second time domain unit j, where N2 is a positive number. For example, the first time domain unit i is located before the first time domain unit j.

[0122] Exemplarily, the frequency domain units occupied by the TRS on the second time domain unit i are a subset or part of the frequency domain units occupied by the TRS on the second time domain unit j. For example, the second time domain unit i is located before the second time domain unit j.

[0123] In some embodiments, when the frequency domain resources occupied by the TRS in multiple first time domain units are at least partially different, the frequency domain resources occupied by the TRS satisfy at least one of the following:

[0124] The first frequency domain resources occupied by the TRSs corresponding to at least some of the first time domain units are different;

[0125] The first frequency domain resources occupied by TRSs corresponding to at least some of the second time domain units are different.

[0126] This embodiment can reduce the overall overhead of the TRS in the network while increasing the frequency domain span of the TRS.

[0127] Exemplarily, the first frequency domain resource is RB or RE.

[0128] In some embodiments, when the time domain density of the TRS on multiple first time domain units is at least partially different, the time domain density of the TRS satisfies at least one of the following:

[0129] The time domain density corresponding to the second time domain position is lower than the time domain density corresponding to the second time domain position;

[0130] There is a multiple relationship between corresponding time domain densities on at least some of the first time domain units;

[0131] There is a multiple relationship between the corresponding time domain densities on at least some of the second time domain units.

[0132] This embodiment can reduce the overall overhead of the TRS in the network while increasing the time domain span of the TRS.

[0133] In this embodiment, the existence of a multiple relationship between the time domain densities corresponding to at least part of the first time domain units (such as symbols) is beneficial to the joint measurement of TRS, or the existence of a multiple relationship between the time domain densities corresponding to at least part of the second time domain units (such as time slots) is beneficial to the joint measurement of TRS.

[0134] Illustratively, the second time domain position may be a first time domain unit or a second time domain unit, or the second time domain position may be a specific position on a first time domain unit or a second time domain unit.

[0135] Exemplarily, the time domain density of the TRS corresponding to after the second time domain unit i is N3 times the time domain density of the TRS corresponding to before the second time domain unit i, where N3 is a positive number.

[0136] Exemplarily, the time domain density of the TRS corresponding to the second time domain unit i is N4 times the time domain density of the TRS corresponding to the second time domain unit j, where N4 is a positive number. For example, the first time domain unit i is located before the first time domain unit j.

[0137] Exemplarily, the time domain units occupied by the TRS on the second time domain unit i are a subset or part of the time domain units occupied by the TRS on the second time domain unit j. For example, the second time domain unit i is located before the second time domain unit j.

[0138] In some embodiments, when the time domain resources occupied by the TRS in multiple (including two) first time domain units are at least partially different, the time domain resources occupied by the TRS satisfy at least one of the following:

[0139] In at least part of the second time domain units, the first time domain units occupied by the TRS are different;

[0140] On at least part of the second time domain units, the number of first time domain units occupied by the TRS is different;

[0141] In at least part of the second time domain units, the starting first time domain units occupied by the TRS are different.

[0142] This embodiment can reduce the overall overhead of the TRS in the network while increasing the time domain span of the TRS.

[0143] Exemplarily, the position of the first time domain unit (eg, symbol) occupied by the TRS on the second time domain unit i is different from the position of the first time domain unit (eg, symbol) occupied by the TRS on the second time domain unit j.

[0144] Exemplarily, the number of first time domain units (eg, symbols) occupied by the TRS on the second time domain unit i is different from the number of first time domain units (eg, symbols) occupied by the TRS on the second time domain unit j.

[0145] Exemplarily, the starting first time domain unit (eg, symbol) occupied by the TRS on the second time domain unit i is different from the starting first time domain unit (eg, symbol) occupied by the TRS on the second time domain unit j.

[0146] In some implementations, the starting first time domain unit may also be replaced by an offset of the first time domain unit.

[0147] In some embodiments, when the TRS occupies multiple (including two) second time domain units (such as time slots), at least some of the multiple second time domain units are discontinuous, or at least some of the multiple second time domain units are continuous.

[0148] Exemplarily, a TRS occupies X time slots, and the X time slots may be adjacent or non-adjacent, for example, all of the X time slots are non-contiguous, or at least part of the X time slots are continuous.

[0149] This embodiment can reduce the overall overhead of the TRS in the network while increasing the time domain span of the TRS.

[0150] In some embodiments, the tracking reference signal transmission method 200 further includes:

[0151] The terminal determines a frequency domain density of the TRS based on a second parameter;

[0152] The second parameter includes at least one of the following:

[0153] a first threshold, the first threshold being used to determine whether to adjust the frequency domain density;

[0154] A first indication parameter is used to determine the frequency domain density.

[0155] In this embodiment, to further reduce TRS overhead, the frequency domain density of the TRS may be reduced (for large bandwidth or low latency scenarios). For example, the frequency domain density of the TRS may be adjusted based on the first threshold or the first indication parameter to achieve the purpose of reducing the frequency domain density of the TRS.

[0156] Exemplarily, the first threshold may be configured or indicated by the network side, or the first threshold may be agreed upon by a protocol.

[0157] Exemplarily, the network-side device or the terminal may determine whether to adjust the frequency domain density according to the first threshold.

[0158] Exemplarily, the first indication parameter is a parameter used to enable a specific transmission mode (eg, a high-speed rail-related transmission mode, or a low-latency-related transmission mode, or a large bandwidth-related mode).

[0159] Exemplarily, there is a mapping relationship between the first indication parameter and the frequency domain density, for example, a certain value / field of the first indication parameter corresponds to a specific frequency domain density.

[0160] Exemplarily, the frequency domain density of TRS is 1 / Y, where Y can be 6, 8, or 12.

[0161] For example, the frequency domain density of TRS is 1 / 6, that is, each RB occupies 2 REs, and the interval between every two REs is 6.

[0162] For example, the frequency domain density of TRS is 1 / 8, that is, every 2 RBs occupy 3 REs, and the interval between every two REs is 8.

[0163] For example, the frequency domain density of TRS is 1 / 12, that is, each RB occupies one RE, and the interval between every two REs is 12.

[0164] In some embodiments, the terminal may report to the network to adjust the frequency domain density. At the same time, the terminal may perform at least one of the following: reporting the delay; reporting the delay correlation coefficient, which is used to characterize the level of delay; or reporting the target frequency domain density.

[0165] In some embodiments, the tracking reference signal transmission method 200 further includes:

[0166] When a first result of the TRS measurement by the terminal does not meet a first threshold, the terminal sends a first message, where the first message is used by the network side device to determine the frequency domain density of the TRS;

[0167] The first result includes but is not limited to at least one of the following: timing, delay spread, frequency offset, Doppler spread, and reference signal received power (RSRP);

[0168] The first message includes but is not limited to at least one of the following: the first result, a quantization coefficient related to the first result, and a target frequency domain density.

[0169] Accordingly, the network-side device may determine the frequency domain density of the TRS based on the first message.

[0170] In some embodiments, the TRS corresponds to at least one first sequence, wherein the first sequence corresponds to one of the following:

[0171] A cyclic shift;

[0172] An orthogonal cover code (OCC) sequence.

[0173] In this embodiment, in order to further reduce the overall overhead of TRS in the network, multiple TRSs may be multiplexed through CDM.

[0174] For example, CDM multiplexing can be performed based on different cyclic shifts.

[0175] Exemplarily, CDM multiplexing may be performed based on different OCC sequences.

[0176] Optionally, the OCC sequence may be a Walsh code or a Discrete Fourier Transform (DFT) code.

[0177] Exemplarily, when the TRS corresponds to multiple (including two) first sequences, it may be a case where the TRS has multiple ports. In this case, each port corresponds to a first sequence.

[0178] In some embodiments, when the TRS corresponds to multiple (including two) first sequences, the multiple first sequences satisfy at least one of the following:

[0179] The multiple first sequences use the same base sequence;

[0180] The multiple first sequences respectively correspond to multiple ports of the TRS.

[0181] It should be noted that the use of the same base sequence is used to ensure the orthogonality of multiple first sequences. In this case, it can be understood that the first sequence consists of two parts: the base sequence and the cyclic shift or OCC sequence.

[0182] In some embodiments, the OCC sequence is mapped to L third time domain units in the TRS, or the OCC sequence is mapped to L first frequency domain units in the TRS;

[0183] The length of the OCC sequence is L, where L is a positive integer.

[0184] Optionally, the third time domain unit may be a symbol.

[0185] Optionally, the first frequency domain unit may be RE.

[0186] Exemplarily, an OCC sequence with a length of L corresponds to L REs based on the frequency domain, or for example, an OCC sequence with a length of L corresponds to L symbols based on the time domain.

[0187] In some embodiments, the base sequence used by the TRS is generated starting from a specific reference point. For example, the specific reference point is point A. Optionally, multiple CDM multiplexed TRSs can use the same base sequence.

[0188] In some embodiments, the TRS corresponds to at least one first frequency domain range, the first frequency domain range includes M second frequency domain units, M is a positive integer; wherein the second frequency domain unit includes but is not limited to one of the following: RB, RB group, sub-band, bandwidth part (Band Width Part, BWP), sub-BWP (sub-BWP).

[0189] Optionally, different TRSs correspond to different first frequency domain ranges, or different TRSs correspond to the same first frequency domain range, or at least some TRSs correspond to different first frequency domain ranges, depending on the decision of the network side and the guarantee of time-frequency tracking performance.

[0190] For example, when the TRS corresponds to multiple first frequency domain ranges, the different first frequency domain ranges may be discontinuous or continuous, depending on the decision of the network side and the guarantee of time-frequency tracking performance.

[0191] For example, assuming that a TRS corresponds to one first frequency domain range, the first frequency domain range includes three second frequency domain units, and the second frequency domain unit is an RB. For example, TRS1 corresponds to RB0 to RB2, and TRS2 corresponds to RB5 to RB7.

[0192] For example, assuming that a TRS corresponds to one first frequency domain range, the first frequency domain range includes three second frequency domain units, and the second frequency domain unit is an RB group. For example, TRS1 corresponds to RB groups 0 to 2, and TRS2 corresponds to RB groups 5 to 7.

[0193] For example, assuming that a TRS corresponds to one first frequency domain range, the first frequency domain range includes three second frequency domain units, and the second frequency domain unit is a BWP. For example, TRS1 corresponds to BWP0-BWP2, and TRS2 corresponds to BWP5-BWP7.

[0194] For example, assuming that a TRS corresponds to one first frequency domain range, the first frequency domain range includes three second frequency domain units, and the second frequency domain unit is a sub-BWP. For example, TRS1 corresponds to sub-BWP 0 to sub-BWP 2, and TRS2 corresponds to sub-BWP 5 to sub-BWP 7.

[0195] For example, assume that a TRS corresponds to one first frequency domain range, the first frequency domain range includes three second frequency domain units, and the second frequency domain units are sub-bands. For example, TRS1 corresponds to sub-Band 0 to sub-Band 2, and TRS2 corresponds to sub-Band 5 to sub-Band 7.

[0196] For example, assume that TRS1 corresponds to two first frequency domain ranges, the first frequency domain ranges include three second frequency domain units, and the second frequency domain units are RBs. For example, TRS1 corresponds to RB0-RB2 and RB5-RB7. For another example, TRS1 corresponds to RB0-RB2 and RB3-RB5.

[0197] For example, assume that TRS1 corresponds to two first frequency domain ranges, the first frequency domain ranges include three second frequency domain units, and the second frequency domain units are RB groups. For example, TRS1 corresponds to RB groups 0 to 2, and RB groups 5 to 7. For another example, TRS1 corresponds to RB groups 0 to 2, and RB groups 3 to 5.

[0198] For example, assume that TRS1 corresponds to two first frequency domain ranges, and the first frequency domain ranges include three second frequency domain units, each of which is a BWP. For example, TRS1 corresponds to BWP0-BWP2 and BWP5-BWP7. For another example, TRS1 corresponds to BWP0-BWP2 and BWP3-BWP5.

[0199] For example, assume that TRS1 corresponds to two first frequency domain ranges, and the first frequency domain ranges include three second frequency domain units, each of which is a sub-BWP. For example, TRS1 corresponds to sub-BWP 0 through sub-BWP 2, and sub-BWP 5 through sub-BWP 7. For another example, TRS1 corresponds to sub-BWP 0 through sub-BWP 2, and sub-BWP 3 through sub-BWP 5.

[0200] For example, assume that TRS1 corresponds to two first frequency domain ranges, and the first frequency domain ranges include three second frequency domain units, each of which is a sub-band. For example, TRS1 corresponds to sub-Band 0 to sub-Band 2, and sub-Band 5 to sub-Band 7. For another example, TRS1 corresponds to sub-Band 0 to sub-Band 2, and sub-Band 3 to sub-Band 5.

[0201] In some embodiments, when a terminal receives multiple (including two) TRSs and performs joint measurement based on the multiple TRSs, the multiple TRSs are used as QCL references for other reference signals, or the multiple TRSs are used jointly as QCL references for other reference signals. It should be noted that the result of the joint measurement is used for time-frequency tracking.

[0202] Exemplarily, the terminal measures the same channel parameter through at least some of the multiple TRSs, where the channel parameter includes at least one of the following: timing, delay spread, frequency offset, and Doppler spread.

[0203] In some embodiments, when the TRS corresponds to multiple (including two) repetitions, at least one of the following is satisfied between the multiple repetitions:

[0204] The multiple repetitions are separated by K1 fourth time domain units;

[0205] The starting time domain positions of the multiple repetitions are spaced apart by K2 fifth time domain units;

[0206] The multiple repetitions are separated by K3 third frequency domain units;

[0207] The starting frequency domain positions of the multiple repetitions are spaced apart by K4 fourth frequency domain units;

[0208] Among them, K1 and K2 are both integers, and K1≥0, K2≥1; K3 and K4 are both integers, and K3≥0, K4≥1.

[0209] In this embodiment, in order to enhance the time domain span of the TRS, repetition in the time domain may be performed for the TRS; or, in order to enhance the frequency domain span of the TRS, repetition in the frequency domain may be performed for the TRS.

[0210] Optionally, the fourth time domain unit is one of the following: symbol, time slot, subframe, frame, microsecond, millisecond, second, minute.

[0211] Optionally, the fifth time domain unit is one of the following: symbol, time slot, subframe, frame, microsecond, millisecond, second, minute.

[0212] Optionally, the third frequency domain unit is one of the following: RB, RE.

[0213] Optionally, the fourth frequency domain unit is one of the following: RB, RE.

[0214] In some embodiments, when the terminal receives multiple (including two) TRSs and the terminal performs joint measurement based on the multiple TRSs, the third parameters of at least some of the multiple TRSs are different, or the third parameters of at least some of the multiple TRSs are the same;

[0215] The third parameter includes but is not limited to at least one of the following:

[0216] Frequency domain density;

[0217] Time domain density;

[0218] Occupied time domain resources;

[0219] Occupied frequency domain resources;

[0220] Transmission power;

[0221] Cycle type;

[0222] cycle;

[0223] QCL reference.

[0224] Exemplarily, the third parameter may be configured or indicated by the network side, or the third parameter may be reported by the terminal, or the third parameter may be agreed upon by a protocol.

[0225] In some embodiments, in order to improve the time-frequency tracking performance of TRS, multiple TRSs may be measured, wherein the multiple TRSs include at least one of the following:

[0226] The frequency domain density of the multiple (including two) TRSs, the time domain density of the multiple (including two) TRSs, the time domain span occupied by the multiple TRSs, the time domain position of the multiple (including two) TRSs, the transmission power of the multiple (including two) TRSs, the period of the multiple (including two) TRSs, and the QCL reference relationship corresponding to the multiple (including two) TRSs.

[0227] Exemplarily, the frequency domain density of each TRS may be configured separately.

[0228] Exemplarily, the time domain density of the TRS may be configured individually for each TRS.

[0229] Illustratively, different TRSs occupy different time domain spans, such as TRS1 occupies 1 time slot and TRS2 occupies 2 time slots.

[0230] Exemplarily, the time domain positions of the multiple TRSs are the same or different. For example, the multiple TRSs may be located in the same or different time slots, such as TRS1 and TRS2 are both located in the same time slot, or in the same two time slots. For example, the multiple TRSs may be located on the same or different symbols, such as TRS1 and TRS2 are located on the same symbol using FDM or CDM.

[0231] Exemplarily, the transmission powers of the multiple TRSs are the same or different, for example, TRS1 has a high transmission power and TRS2 has a low transmission power.

[0232] Exemplarily, the periodic types of the multiple TRSs are the same or different, for example, the first one is a periodic TRS and the second one is an aperiodic TRS.

[0233] Exemplarily, the periods of the multiple TRSs are the same or different. For example, the first TRS has a period of 50 ms, and the second TRS has a period of 100 ms.

[0234] Exemplarily, the QCL reference relationships corresponding to the multiple TRSs are the same or different. The QCL reference relationships include but are not limited to: beam, spatial filter, etc.

[0235] Therefore, in an embodiment of the present application, the TRS satisfies at least one of the following: the TRS occupies at least one first time domain unit and at least one second time domain unit, the TRS corresponds to at least one first sequence, the TRS corresponds to at least one first frequency domain range, and the TRS corresponds to at least one repetition. Specifically, the present application designs a more flexible TRS based on at least one aspect of the time domain, frequency domain, and code domain, which can improve the time-frequency tracking performance of the TRS and reduce the resource overhead of the TRS.

[0236] The technical solution of this application is described below through Examples 1 to 5.

[0237] In Example 1, to increase the time domain span of the TRS, as shown in FIG4 , the TRS occupies 3 time slots and 100 RBs ( FIG4 only shows a portion of 2 RBs; the other portions are similar). However, to further reduce the resource overhead of the TRS, the frequency domain density of the TRS on time slot #3 can be reduced.

[0238] As shown in Figure 4, the TRS frequency domain density in time slot #3 is half that of time slots #1 and #2. The frequency domain densities, or the relationship between them (e.g., a multiple relationship), can be configured on the network side (e.g., RRC parameters) or by protocol default. Furthermore, the frequency domain resources occupied by the TRS in time slot #3 are a subset of those in time slots #1 and #2. This facilitates joint measurement by the terminal using TRS resources from the same frequency domain resources across multiple time slots.

[0239] In Example 2, to increase the time domain span of the TRS, as shown in Figure 5, the TRS occupies three time slots and 100 RBs (Figure 5 only shows a two-RB portion; the rest is similar). However, to further reduce TRS resource overhead, the time domain density of the TRS can be reduced in some time slots. For example, in Figure 5, the TRS occupies two symbols in time slot #1, while only one symbol in time slots #2 and #3. This has the advantage of reducing the overall TRS overhead while increasing the time span.

[0240] As shown in Figure 5, the TRS time domain density on time slots #2 and #3 is 1 / 2 of that on time slot #1. The time domain density between the two or the relationship between the time domain densities (e.g., a multiple relationship) can be configured on the network side (e.g., RRC parameters) or by default agreement on the protocol. In addition, the time domain resources occupied by TRS on time slots #2 and #3 are a subset of those on time slot #1. Of course, the symbol occupied by TRS on time slot #2 or time slot #3 (symbol #3) can also be different from that in time slot #1 (including a different starting symbol position). For example, this can be configured separately on the network side or agreed upon by default on the network side.

[0241] In embodiment 3, in order to increase the time domain span of the TRS, the TRS may be repeated in the time domain. For example, assuming that one repetition of the TRS occupies two symbols in one time slot, the TRS may be repeated in the time domain.

[0242] Figure 6 shows an example of a three-repetition TRS, where the three repetitions occupy three consecutive time slots. However, the time domain locations occupied by multiple repetitions can also be discontinuous, for example, spaced apart by A time slots. This can be configured by the network (either for all repetitions or for each repetition individually, for example, via a bitmap) or by protocol default.

[0243] Furthermore, multiple repetitions can occupy the same time slot, as shown in Figure 7. Assuming that a TRS repetition occupies two symbols within a time slot, the first and second TRS repetitions fall within the same time slot. This approach also extends the time domain span and increases the number of time domain symbols, improving time-frequency tracking performance.

[0244] In Example 4, time-frequency tracking performance can be enhanced by combining multiple TRS resources. For example, as shown in Figure 8, three TRS resources are used for joint measurement. TRS1 occupies time slot #1 and two symbols with a 4-symbol interval between symbols; TRS occupies time slot #2 and two symbols with a 7-symbol interval between symbols; and TRS3 occupies time slot #3 and three symbols with a 4-symbol interval between symbols.

[0245] That is, when performing joint measurement based on multiple TRS resources, the time-frequency resource occupancy of the multiple TRSs can be different. This can be configured on the network side (for example, each TRS is configured separately, or multiple TRSs are configured jointly), or it can be a default agreement on the network side. Different time-frequency tracking effects can be achieved by different TRS resource time-frequency occupancy.

[0246] In Example 5, for large bandwidth scenarios, time-frequency tracking can be performed by configuring different TRSs in different bandwidth ranges, as shown in Figure 9. For example, the entire large bandwidth can be divided into L bandwidth ranges, and a TRS is configured in each bandwidth range. The TRS configurations can be the same or different, depending on the decision-making of the network side and the guarantee of time-frequency tracking performance.

[0247] In this case, the terminal can jointly measure certain parameters, such as timing and delay spread, across multiple TRSs. Certain parameters, such as frequency offset and Doppler spread, can be measured separately on each TRS. Alternatively, the terminal can measure certain parameters on only some TRSs to reduce terminal complexity. Based on this, the QCL reference for downlink transmission can be any of these multiple TRSs or a subset of them.

[0248] Therefore, the TRS enhancement solution offers two main benefits. First, it improves TRS's time and frequency tracking performance, enabling it to cope with higher mobile speeds, large bandwidths, and low latency scenarios for future 6G systems. Second, it provides a more flexible TRS, effectively reducing overall TRS resource overhead while maintaining time and frequency tracking performance.

[0249] The tracking reference signal transmission method provided in the embodiments of the present application can be performed by a tracking reference signal transmission device, or a processing unit within the tracking reference signal transmission device that is configured to perform the tracking reference signal transmission method. In the embodiments of the present application, the tracking reference signal transmission device provided in the embodiments of the present application is described using the example of a tracking reference signal transmission device performing the tracking reference signal transmission method.

[0250] FIG10 shows a schematic block diagram of a tracking reference signal transmission device 300 according to an embodiment of the present application. As shown in FIG10 , the tracking reference signal transmission device 300 includes:

[0251] The transceiver unit 310 is configured to receive at least one tracking reference signal TRS;

[0252] A processing unit 320 is configured to perform time-frequency tracking based on the at least one TRS;

[0253] The TRS satisfies at least one of the following:

[0254] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0255] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0256] The TRS corresponds to at least one first frequency domain range;

[0257] The TRS corresponds to at least one repeat.

[0258] In some embodiments, when the TRS occupies multiple first time domain units, the first parameters of the TRS on the multiple first time domain units are all the same or at least partially different;

[0259] The first parameter includes at least one of the following:

[0260] Frequency domain density;

[0261] Occupied frequency domain resources;

[0262] Time domain density;

[0263] Occupied time domain resources;

[0264] Transmission power.

[0265] In some embodiments, when the TRS occupies multiple second time domain units, at least some of the multiple second time domain units are discontinuous, or at least some of the multiple second time domain units are continuous.

[0266] In some embodiments, when the frequency domain density of the TRS on the plurality of first time domain units is at least partially different, the frequency domain density of the TRS satisfies at least one of the following:

[0267] The frequency domain density corresponding to the first time domain position is lower than the frequency domain density corresponding to the first time domain position;

[0268] There is a multiple relationship between the frequency domain densities corresponding to at least some of the first time domain units;

[0269] There is a multiple relationship between the frequency domain densities corresponding to at least some of the second time domain units.

[0270] In some embodiments, when the frequency domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the frequency domain resources occupied by the TRS meet at least one of the following conditions:

[0271] The first frequency domain resources occupied by the TRSs corresponding to at least some of the first time domain units are different;

[0272] The first frequency domain resources occupied by the TRSs corresponding to at least some of the second time domain units are different.

[0273] In some embodiments, when the time domain density of the TRS on the plurality of first time domain units is at least partially different, the time domain density of the TRS satisfies at least one of the following:

[0274] The time domain density corresponding to the second time domain position is lower than the time domain density corresponding to the second time domain position;

[0275] There is a multiple relationship between the time domain densities corresponding to at least some of the first time domain units;

[0276] There is a multiple relationship between the corresponding time domain densities on at least part of the second time domain units.

[0277] In some embodiments, when the time domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the time domain resources occupied by the TRS meet at least one of the following conditions:

[0278] In at least part of the second time domain units, the first time domain units occupied by the TRS are different;

[0279] In at least some of the second time domain units, the number of the first time domain units occupied by the TRS is different;

[0280] In at least part of the second time domain units, the starting first time domain units occupied by the TRS are different.

[0281] In some embodiments, the processing unit 320 is further configured to determine a frequency domain density of the TRS based on a second parameter;

[0282] The second parameter includes at least one of the following:

[0283] a first threshold, wherein the first threshold is used to determine whether to adjust the frequency domain density;

[0284] A first indication parameter is used to determine the frequency domain density.

[0285] In some embodiments, when the first result of the TRS measurement by the tracking reference signal transmission device 300 does not meet the first threshold, the transceiver unit 310 is further configured to send a first message, where the first message is used for the network side device to determine the frequency domain density;

[0286] The first result includes at least one of the following: timing, delay spread, frequency offset, Doppler spread, and reference signal received power RSRP;

[0287] The first message includes at least one of the following: the first result, a quantization coefficient related to the first result, and a target frequency domain density.

[0288] In some embodiments, the TRS corresponds to at least one first sequence, wherein the first sequence corresponds to one of the following:

[0289] A circular shift;

[0290] An orthogonal cover code OCC sequence.

[0291] In some embodiments, when the TRS corresponds to multiple first sequences, the multiple first sequences satisfy at least one of the following:

[0292] The multiple first sequences use the same base sequence;

[0293] The multiple first sequences respectively correspond to multiple ports of the TRS.

[0294] In some embodiments, the OCC sequence is mapped to L third time domain units in the TRS, or the OCC sequence is mapped to L first frequency domain units in the TRS;

[0295] The length of the OCC sequence is L, where L is a positive integer.

[0296] In some embodiments, the base sequence used by the TRS is generated starting from a specific reference point.

[0297] In some embodiments, the TRS corresponds to at least one first frequency domain range, the first frequency domain range includes M second frequency domain units, M is a positive integer; wherein the second frequency domain unit includes one of the following: RB, RB group, subband, bandwidth part BWP, sub-BWP.

[0298] In some embodiments, different TRSs correspond to different first frequency domain ranges, or different TRSs correspond to the same first frequency domain range, or at least some of the TRSs correspond to different first frequency domain ranges.

[0299] In some embodiments, when the transmission device 300 for tracking the reference signal receives multiple TRSs and the transmission device 300 for tracking the reference signal performs joint measurement based on the multiple TRSs, the multiple TRSs are respectively used as quasi-co-site QCL references for other reference signals, or the multiple TRSs are jointly used as QCL references for other reference signals.

[0300] In some embodiments, when the TRS corresponds to multiple repetitions, at least one of the following is satisfied between the multiple repetitions:

[0301] The multiple repetitions are separated by K1 fourth time domain units;

[0302] The starting time domain positions of the multiple repetitions are spaced apart by K2 fifth time domain units;

[0303] The multiple repetitions are separated by K3 third frequency domain units;

[0304] The starting frequency domain positions of the multiple repetitions are spaced apart by K4 fourth frequency domain units;

[0305] Among them, K1 and K2 are both integers, and K1≥0, K2≥1; K3 and K4 are both integers, and K3≥0, K4≥1.

[0306] In some embodiments, when the tracking reference signal transmission device 300 receives a plurality of TRSs and the tracking reference signal transmission device 300 performs joint measurement based on the plurality of TRSs, the third parameters of at least some of the plurality of TRSs are different, or the third parameters of at least some of the plurality of TRSs are the same;

[0307] The third parameter includes at least one of the following:

[0308] Frequency domain density;

[0309] Time domain density;

[0310] Occupied time domain resources;

[0311] Occupied frequency domain resources;

[0312] Transmission power;

[0313] Cycle type;

[0314] cycle;

[0315] QCL reference.

[0316] In some embodiments, the transceiver unit 310 may be a communication interface or transceiver, or an input / output interface of a communication chip or a system on chip. The processing unit 320 may be embedded in or independent of a processor of the terminal in the form of hardware.

[0317] It should be understood that the transmission device 300 for tracking reference signals according to an embodiment of the present application may correspond to the terminal in the method embodiment of the present application, and the various units in the transmission device 300 for tracking reference signals are respectively for implementing the corresponding processes of the terminal in the method 200 shown in Figure 3. For the sake of brevity, they will not be repeated here.

[0318] Therefore, in an embodiment of the present application, the TRS satisfies at least one of the following: the TRS occupies at least one first time domain unit and at least one second time domain unit, the TRS corresponds to at least one first sequence, the TRS corresponds to at least one first frequency domain range, and the TRS corresponds to at least one repetition. Specifically, the embodiment of the present application designs a more flexible TRS based on at least one aspect of the time domain, frequency domain, and code domain, which can improve the time-frequency tracking performance of the TRS and reduce the resource overhead of the TRS.

[0319] FIG11 shows a schematic block diagram of a tracking reference signal transmission device 400 according to an embodiment of the present application. As shown in FIG11 , the tracking reference signal transmission device 400 includes:

[0320] The transceiver unit 410 is configured to send at least one tracking reference signal TRS;

[0321] The TRS satisfies at least one of the following:

[0322] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit;

[0323] The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS;

[0324] The TRS corresponds to at least one first frequency domain range;

[0325] The TRS corresponds to at least one repeat.

[0326] In some embodiments, when the TRS occupies multiple first time domain units, the first parameters of the TRS on the multiple first time domain units are all the same or at least partially different;

[0327] The first parameter includes at least one of the following:

[0328] Frequency domain density;

[0329] Occupied frequency domain resources;

[0330] Time domain density;

[0331] Occupied time domain resources;

[0332] Transmission power.

[0333] In some embodiments, when the TRS occupies multiple second time domain units, at least some of the multiple second time domain units are discontinuous, or at least some of the multiple second time domain units are continuous.

[0334] In some embodiments, when the frequency domain density of the TRS on the plurality of first time domain units is at least partially different, the frequency domain density of the TRS satisfies at least one of the following:

[0335] The frequency domain density corresponding to the first time domain position is lower than the frequency domain density corresponding to the first time domain position;

[0336] There is a multiple relationship between the frequency domain densities corresponding to at least some of the first time domain units;

[0337] There is a multiple relationship between the frequency domain densities corresponding to at least some of the second time domain units.

[0338] In some embodiments, when the frequency domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the frequency domain resources occupied by the TRS meet at least one of the following conditions:

[0339] The first frequency domain resources occupied by the TRSs corresponding to at least some of the first time domain units are different;

[0340] The first frequency domain resources occupied by the TRSs corresponding to at least some of the second time domain units are different.

[0341] In some embodiments, when the time domain density of the TRS on the plurality of first time domain units is at least partially different, the time domain density of the TRS satisfies at least one of the following:

[0342] The time domain density corresponding to the second time domain position is lower than the time domain density corresponding to the second time domain position;

[0343] There is a multiple relationship between the time domain densities corresponding to at least some of the first time domain units;

[0344] There is a multiple relationship between the corresponding time domain densities on at least part of the second time domain units.

[0345] In some embodiments, when the time domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the time domain resources occupied by the TRS meet at least one of the following conditions:

[0346] In at least part of the second time domain units, the first time domain units occupied by the TRS are different;

[0347] In at least some of the second time domain units, the number of the first time domain units occupied by the TRS is different;

[0348] In at least part of the second time domain units, the starting first time domain units occupied by the TRS are different.

[0349] In some embodiments, the transceiver unit 410 is further configured to receive a first message, wherein the first message is used to determine the frequency domain density of the TRS.

[0350] In some embodiments, when the TRS corresponds to at least one first sequence, the first sequence corresponds to one of the following:

[0351] A circular shift;

[0352] An orthogonal cover code OCC sequence.

[0353] In some embodiments, when the TRS corresponds to multiple first sequences, the multiple first sequences satisfy at least one of the following:

[0354] The multiple first sequences use the same base sequence;

[0355] The multiple first sequences respectively correspond to multiple ports of the TRS.

[0356] In some embodiments, the OCC sequence is mapped to L third time domain units in the TRS, or the OCC sequence is mapped to L first frequency domain units in the TRS;

[0357] The length of the OCC sequence is L, where L is a positive integer.

[0358] In some embodiments, the base sequence used by the TRS is generated starting from a specific reference point.

[0359] In some embodiments, when the TRS corresponds to at least one first frequency domain range, the first frequency domain range includes M second frequency domain units, where M is a positive integer;

[0360] The second frequency domain unit includes one of the following: RB, RB group, sub-band, bandwidth part BWP, sub-BWP.

[0361] In some embodiments, different TRSs correspond to different first frequency domain ranges, or different TRSs correspond to the same first frequency domain range, or at least some of the TRSs correspond to different first frequency domain ranges.

[0362] In some embodiments, when the network side device sends multiple TRSs and the multiple TRSs are used for joint measurement, the multiple TRSs are respectively used as quasi-co-site QCL references for other reference signals, or the multiple TRSs are jointly used as QCL references for other reference signals.

[0363] In some embodiments, when the TRS corresponds to multiple repetitions, at least one of the following is satisfied between the multiple repetitions:

[0364] The multiple repetitions are separated by K1 fourth time domain units;

[0365] The starting time domain positions of the multiple repetitions are spaced apart by K2 fifth time domain units;

[0366] The multiple repetitions are separated by K3 third frequency domain units;

[0367] The starting frequency domain positions of the multiple repetitions are spaced apart by K4 fourth frequency domain units;

[0368] Among them, K1 and K2 are both integers, and K1≥0, K2≥1; K3 and K4 are both integers, and K3≥0, K4≥1.

[0369] In some embodiments, when the network side device sends multiple TRSs and the multiple TRSs are used for joint measurement, the third parameters of at least some of the multiple TRSs are different, or the third parameters of at least some of the multiple TRSs are the same;

[0370] The third parameter includes at least one of the following:

[0371] Frequency domain density;

[0372] Time domain density;

[0373] Occupied time domain resources;

[0374] Occupied frequency domain resources;

[0375] Transmission power;

[0376] Cycle type;

[0377] cycle;

[0378] QCL reference.

[0379] In some embodiments, the transceiver unit 410 may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0380] It should be understood that the transmission device 400 for tracking reference signals according to an embodiment of the present application may correspond to the network side device in an embodiment of the method of the present application, and the various units in the transmission device 400 for tracking reference signals are respectively for implementing the corresponding processes of the network side device in the method 200 shown in Figure 3. For the sake of brevity, they will not be repeated here.

[0381] Therefore, in an embodiment of the present application, the TRS satisfies at least one of the following: the TRS occupies at least one first time domain unit and at least one second time domain unit, the TRS corresponds to at least one first sequence, the TRS corresponds to at least one first frequency domain range, and the TRS corresponds to at least one repetition. Specifically, the embodiment of the present application designs a more flexible TRS based on at least one aspect of the time domain, frequency domain, and code domain, which can improve the time-frequency tracking performance of the TRS and reduce the resource overhead of the TRS.

[0382] The transmission device for the tracking reference signal in the embodiment of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or a network-side device, or can be a device other than a terminal or a network-side device. For example, the terminal can include but is not limited to the types of the terminal 11 listed above, the network-side device can include but is not limited to the types of the network-side device 12 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0383] The transmission device for tracking reference signals provided in the embodiment of the present application can implement the various processes implemented in the method embodiment of Figure 3 and achieve the same technical effects. To avoid repetition, they will not be described here.

[0384] As shown in FIG12 , an embodiment of the present application further provides a communication device 500 , including a processor 501 and a memory 502 , where the memory 502 stores programs or instructions that can be run on the processor 501 .

[0385] For example, when the communication device 500 is a terminal, the program or instruction is executed by the processor 501 to implement the various steps performed by the terminal in the above-mentioned tracking reference signal transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0386] For another example, when the communication device 500 is a network side device, when the program or instruction is executed by the processor 501, the various steps performed by the network side device in the above-mentioned tracking reference signal transmission method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0387] The present application also provides a terminal comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps performed by the terminal in the method embodiment shown in FIG3 . This terminal embodiment corresponds to the aforementioned terminal-side method embodiment, and each implementation process and implementation method of the aforementioned method embodiment is applicable to this terminal embodiment and can achieve the same technical effects. Specifically, FIG13 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0388] The terminal 600 includes but is not limited to: a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 608, a memory 609 and at least some of the components of the processor 610.

[0389] Those skilled in the art will appreciate that the terminal 600 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 610 through a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in FIG13 does not constitute a limitation of 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 described in detail here.

[0390] It should be understood that in an embodiment of the present application, the input unit 604 may include a graphics processing unit (GPU) 6041 and a microphone 6042, and the graphics processor 6041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 606 may include a display panel 6061, and the display panel 6061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 607 includes a touch panel 6071 and at least one of other input devices 6072. The touch panel 6071 is also called a touch screen. The touch panel 6071 may include two parts: a touch detection device and a touch controller. Other input devices 6072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0391] In the embodiment of the present application, after receiving downlink data from a network-side device, the radio frequency unit 601 may transmit the data to the processor 610 for processing. Furthermore, the radio frequency unit 601 may send uplink data to the network-side device. Typically, the radio frequency unit 601 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0392] The memory 609 can be used to store software programs or instructions and various data. The memory 609 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 609 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 609 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0393] Processor 610 may include at least one processing unit. Optionally, processor 610 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 610.

[0394] The radio frequency unit 601 is configured to receive at least one TRS;

[0395] The processor 610 is configured to perform time-frequency tracking based on the at least one TRS;

[0396] The TRS satisfies at least one of the following:

[0397] The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one of the first time domain units;

[0398] The TRS corresponds to at least one first sequence, and the first sequence is used for multiplexing of the TRS;

[0399] The TRS corresponds to at least one first frequency domain range;

[0400] The TRS corresponds to at least one repetition.

[0401] It can be 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 effects. To avoid repetition, it will not be described here.

[0402] The present application also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps performed by the network-side device in the method embodiment shown in FIG3 . This network-side device embodiment corresponds to the aforementioned network-side device method embodiment, and each implementation process and implementation method of the aforementioned method embodiment is applicable to this network-side device embodiment and can achieve the same technical effects. For the sake of brevity, they are not further described here.

[0403] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 14, the network-side device 700 includes an antenna 71, a radio frequency device 72, a baseband device 73, a processor 74, and a memory 75. Antenna 71 is connected to radio frequency device 72. In the uplink direction, radio frequency device 72 receives information via antenna 71 and sends the received information to baseband device 73 for processing. In the downlink direction, baseband device 73 processes the information to be transmitted and sends it to radio frequency device 72. Radio frequency device 72 processes the received information and then sends it through antenna 71.

[0404] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 73 , which includes a baseband processor.

[0405] The baseband device 73 may include, for example, at least one baseband board, on which at least two chips are arranged, as shown in Figure 14, one of the chips is, for example, a baseband processor, which is connected to the memory 75 through a bus interface to call the program in the memory 75 and execute the network device operations shown in the above method embodiment.

[0406] The network side device may further include a network interface 76, which is, for example, a Common Public Radio Interface (CPRI).

[0407] Specifically, the network side device 700 of the embodiment of the present application also includes: instructions or programs stored in the memory 75 and can be run on the processor 74. The processor 74 calls the instructions or programs in the memory 75 to execute the method executed by each unit shown in Figure 11 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0408] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned tracking reference signal transmission method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0409] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0410] An embodiment of the present application further provides a chip, which includes 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 various processes of the above-mentioned tracking reference signal transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0411] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0412] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned tracking reference signal transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0413] An embodiment of the present application also provides a communication system, including: a terminal and a network-side device, wherein the terminal can be used to execute the steps performed by the terminal in the above-mentioned method for transmitting a tracking reference signal, and the network-side device can be used to execute the steps performed by the network-side device in the above-mentioned method for transmitting a tracking reference signal.

[0414] It should be noted that, in this document, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0415] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0416] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A method for transmitting a tracking reference signal, comprising: The terminal receives at least one tracking reference signal TRS; The terminal performs time-frequency tracking based on the at least one TRS; The TRS satisfies at least one of the following: The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit; The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS; The TRS corresponds to at least one first frequency domain range; The TRS corresponds to at least one repeat.

2. The method according to claim 1, wherein In the case where the TRS occupies a plurality of first time domain units, the first parameters of the TRS in the plurality of first time domain units are all the same or at least partially different; The first parameter includes at least one of the following: Frequency domain density; Occupied frequency domain resources; Time domain density; Occupied time domain resources; Transmission power.

3. The method according to claim 1, wherein In the case that the TRS occupies a plurality of second time domain units, at least some of the plurality of second time domain units are discontinuous, or at least some of the plurality of second time domain units are continuous.

4. The method according to claim 2, wherein: In a case where the frequency domain densities of the TRS on the multiple first time domain units are at least partially different, the frequency domain density of the TRS satisfies at least one of the following: The frequency domain density corresponding to the first time domain position is lower than the frequency domain density corresponding to the first time domain position; There is a multiple relationship between the frequency domain densities corresponding to at least some of the first time domain units; There is a multiple relationship between the frequency domain densities corresponding to at least some of the second time domain units.

5. The method according to claim 2, wherein: In a case where the frequency domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the frequency domain resources occupied by the TRS satisfy at least one of the following: The first frequency domain resources occupied by the TRSs corresponding to at least some of the first time domain units are different; The first frequency domain resources occupied by the TRSs corresponding to at least some of the second time domain units are different.

6. The method according to claim 2, wherein: In a case where the time domain densities of the TRS on the multiple first time domain units are at least partially different, the time domain density of the TRS satisfies at least one of the following: The time domain density corresponding to the second time domain position is lower than the time domain density corresponding to the second time domain position; There is a multiple relationship between the time domain densities corresponding to at least some of the first time domain units; There is a multiple relationship between the corresponding time domain densities on at least part of the second time domain units.

7. The method according to claim 2, wherein: In a case where the time domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the time domain resources occupied by the TRS satisfy at least one of the following: In at least part of the second time domain units, the first time domain units occupied by the TRS are different; In at least some of the second time domain units, the number of the first time domain units occupied by the TRS is different; In at least part of the second time domain units, the starting first time domain units occupied by the TRS are different.

8. The method according to claim 1, wherein The method further comprises: The terminal determines the frequency domain density of the TRS based on the second parameter; The second parameter includes at least one of the following: a first threshold, wherein the first threshold is used to determine whether to adjust the frequency domain density; A first indication parameter is used to determine the frequency domain density.

9. The method according to claim 8, wherein The method further comprises: When a first result measured by the terminal based on the TRS does not meet the first threshold, the terminal sends a first message, where the first message is used by a network-side device to determine the frequency domain density; The first result includes at least one of the following: timing, delay spread, frequency offset, Doppler spread, and reference signal received power RSRP; The first message includes at least one of the following: the first result, a quantization coefficient related to the first result, and a target frequency domain density.

10. The method according to claim 1, wherein The TRS corresponds to at least one first sequence, wherein the first sequence corresponds to one of the following: A circular shift; An orthogonal cover code OCC sequence.

11. The method according to claim 10, wherein: In the case where the TRS corresponds to multiple first sequences, the multiple first sequences satisfy at least one of the following: The multiple first sequences use the same base sequence; The multiple first sequences respectively correspond to multiple ports of the TRS.

12. The method according to claim 10, wherein: The OCC sequence is mapped to L third time domain units in the TRS, or the OCC sequence is mapped to L first frequency domain units in the TRS; The length of the OCC sequence is L, where L is a positive integer.

13. The method according to claim 10, wherein: The base sequence used by the TRS is generated starting from a specific reference point.

14. The method according to claim 1, wherein The TRS corresponds to at least one first frequency domain range, the first frequency domain range includes M second frequency domain units, M is a positive integer; wherein the second frequency domain unit includes one of the following: RB, RB group, subband, bandwidth part BWP, sub-BWP.

15. The method according to claim 14, wherein Different TRSs correspond to different first frequency domain ranges, or different TRSs correspond to the same first frequency domain range, or at least some of the TRSs correspond to different first frequency domain ranges.

16. The method according to claim 14 or 15, wherein: When the terminal receives multiple TRSs and performs joint measurement based on the multiple TRSs, the multiple TRSs are respectively used as quasi-co-site QCL references for other reference signals, or the multiple TRSs are jointly used as QCL references for other reference signals.

17. The method according to claim 1, wherein In the case where the TRS corresponds to multiple repetitions, at least one of the following is satisfied between the multiple repetitions: The multiple repetitions are separated by K1 fourth time domain units; The starting time domain positions of the multiple repetitions are spaced apart by K2 fifth time domain units; The multiple repetitions are separated by K3 third frequency domain units; The starting frequency domain positions of the multiple repetitions are spaced apart by K4 fourth frequency domain units; Among them, K1 and K2 are both integers, and K1≥0, K2≥1; K3 and K4 are both integers, and K3≥0, K4≥1.

18. The method according to any one of claims 1 to 17, wherein When the terminal receives multiple TRSs and performs joint measurement based on the multiple TRSs, the third parameters of at least some of the multiple TRSs are different, or the third parameters of at least some of the multiple TRSs are the same; The third parameter includes at least one of the following: Frequency domain density; Time domain density; Occupied time domain resources; Occupied frequency domain resources; Transmission power; Cycle type; cycle; QCL reference.

19. A method for transmitting a tracking reference signal, comprising: The network side device sends at least one tracking reference signal TRS; The TRS satisfies at least one of the following: The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit; The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS; The TRS corresponds to at least one first frequency domain range; The TRS corresponds to at least one repeat.

20. The method according to claim 19, wherein In the case where the TRS occupies a plurality of first time domain units, the first parameters of the TRS in the plurality of first time domain units are all the same or at least partially different; The first parameter includes at least one of the following: Frequency domain density; Occupied frequency domain resources; Time domain density; Occupied time domain resources; Transmission power.

21. The method according to claim 19, wherein In the case that the TRS occupies a plurality of second time domain units, at least some of the plurality of second time domain units are discontinuous, or at least some of the plurality of second time domain units are continuous.

22. The method according to claim 20, wherein In a case where the frequency domain densities of the TRS on the multiple first time domain units are at least partially different, the frequency domain density of the TRS satisfies at least one of the following: The frequency domain density corresponding to the first time domain position is lower than the frequency domain density corresponding to the first time domain position; There is a multiple relationship between the frequency domain densities corresponding to at least some of the first time domain units; There is a multiple relationship between the frequency domain densities corresponding to at least some of the second time domain units.

23. The method according to claim 20, wherein In a case where the frequency domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the frequency domain resources occupied by the TRS satisfy at least one of the following: The first frequency domain resources occupied by the TRSs corresponding to at least some of the first time domain units are different; The first frequency domain resources occupied by the TRSs corresponding to at least some of the second time domain units are different.

24. The method according to claim 20, wherein In a case where the time domain densities of the TRS on the multiple first time domain units are at least partially different, the time domain density of the TRS satisfies at least one of the following: The time domain density corresponding to the second time domain position is lower than the time domain density corresponding to the second time domain position; There is a multiple relationship between the time domain densities corresponding to at least some of the first time domain units; There is a multiple relationship between the corresponding time domain densities on at least part of the second time domain units.

25. The method according to claim 20, wherein In a case where the time domain resources occupied by the TRS in the multiple first time domain units are at least partially different, the time domain resources occupied by the TRS satisfy at least one of the following: In at least part of the second time domain units, the first time domain units occupied by the TRS are different; In at least some of the second time domain units, the number of the first time domain units occupied by the TRS is different; In at least part of the second time domain units, the starting first time domain units occupied by the TRS are different.

26. The method according to claim 19, wherein The method further comprises: The network-side device receives a first message, where the first message is used to determine the frequency domain density of the TRS.

27. The method according to claim 19, wherein In the case where the TRS corresponds to at least one first sequence, the first sequence corresponds to one of the following: A circular shift; An orthogonal cover code OCC sequence.

28. The method according to claim 27, wherein In the case where the TRS corresponds to multiple first sequences, the multiple first sequences satisfy at least one of the following: The multiple first sequences use the same base sequence; The multiple first sequences respectively correspond to multiple ports of the TRS.

29. The method according to claim 27, wherein The OCC sequence is mapped to L third time domain units in the TRS, or the OCC sequence is mapped to L first frequency domain units in the TRS; The length of the OCC sequence is L, where L is a positive integer.

30. The method of claim 27, wherein: The base sequence used by the TRS is generated starting from a specific reference point.

31. The method according to claim 19, wherein In a case where the TRS corresponds to at least one first frequency domain range, the first frequency domain range includes M second frequency domain units, where M is a positive integer; The second frequency domain unit includes one of the following: RB, RB group, sub-band, bandwidth part BWP, sub-BWP.

32. The method according to claim 31, wherein Different TRSs correspond to different first frequency domain ranges, or different TRSs correspond to the same first frequency domain range, or at least some of the TRSs correspond to different first frequency domain ranges.

33. The method according to claim 31 or 32, wherein When the network side device sends multiple TRSs and the multiple TRSs are used for joint measurement, the multiple TRSs are respectively used as quasi-co-site QCL references for other reference signals, or the multiple TRSs are jointly used as QCL references for other reference signals.

34. The method of claim 19, wherein In the case where the TRS corresponds to multiple repetitions, at least one of the following is satisfied between the multiple repetitions: The multiple repetitions are separated by K1 fourth time domain units; The starting time domain positions of the multiple repetitions are spaced apart by K2 fifth time domain units; The multiple repetitions are separated by K3 third frequency domain units; The starting frequency domain positions of the multiple repetitions are spaced apart by K4 fourth frequency domain units; Among them, K1 and K2 are both integers, and K1≥0, K2≥1; K3 and K4 are both integers, and K3≥0, K4≥1.

35. The method according to any one of claims 19 to 34, wherein When the network side device sends multiple TRSs, and the multiple TRSs are used for joint measurement, the third parameters of at least some of the multiple TRSs are different, or the third parameters of at least some of the multiple TRSs are the same; The third parameter includes at least one of the following: Frequency domain density; Time domain density; Occupied time domain resources; Occupied frequency domain resources; Transmission power; Cycle type; cycle; QCL reference.

36. A transmission device for a tracking reference signal, comprising: a transceiver unit, configured to receive at least one tracking reference signal TRS; a processing unit, configured to perform time-frequency tracking based on the at least one TRS; The TRS satisfies at least one of the following: The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit; The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS; The TRS corresponds to at least one first frequency domain range; The TRS corresponds to at least one repeat.

37. The apparatus according to claim 36, wherein In the case where the TRS occupies a plurality of first time domain units, the first parameters of the TRS in the plurality of first time domain units are all the same or at least partially different; The first parameter includes at least one of the following: Frequency domain density; Occupied frequency domain resources; Time domain density; Occupied time domain resources; Transmission power.

38. The apparatus of claim 36, wherein In the case that the TRS occupies a plurality of second time domain units, at least some of the plurality of second time domain units are discontinuous, or at least some of the plurality of second time domain units are continuous.

39. The apparatus of claim 36, wherein: The processing unit is further configured to determine a frequency domain density of the TRS based on a second parameter; The second parameter includes at least one of the following: a first threshold, wherein the first threshold is used to determine whether to adjust the frequency domain density; A first indication parameter is used to determine the frequency domain density.

40. The apparatus of claim 39, wherein When a first result measured by the transmission device of the tracking reference signal based on the TRS does not meet the first threshold, the transceiver unit is further configured to send a first message, where the first message is used for a network-side device to determine the frequency domain density; The first result includes at least one of the following: timing, delay spread, frequency offset, Doppler spread, and reference signal received power RSRP; The first message includes at least one of the following: the first result, a quantization coefficient related to the first result, and a target frequency domain density.

41. The device according to claim 36, in, The TRS corresponds to at least one first sequence, wherein the first sequence corresponds to one of the following: A circular shift; An orthogonal cover code OCC sequence.

42. The device according to claim 36, in, The TRS corresponds to at least one first frequency domain range, the first frequency domain range includes M second frequency domain units, M is a positive integer; wherein the second frequency domain unit includes one of the following: RB, subband, bandwidth part BWP, sub-BWP.

43. The apparatus of claim 36, wherein: In the case where the TRS corresponds to multiple repetitions, at least one of the following is satisfied between the multiple repetitions: The multiple repetitions are separated by K1 fourth time domain units; The starting time domain positions of the multiple repetitions are spaced apart by K2 fifth time domain units; The multiple repetitions are separated by K3 third frequency domain units; The starting frequency domain positions of the multiple repetitions are spaced apart by K4 fourth frequency domain units; Among them, K1 and K2 are both integers, and K1≥0, K2≥1; K3 and K4 are both integers, and K3≥0, K4≥1.

44. The apparatus according to any one of claims 36 to 43, wherein In a case where the apparatus for transmitting the tracking reference signal receives a plurality of TRSs and the apparatus for transmitting the tracking reference signal performs joint measurement based on the plurality of TRSs, third parameters of at least some of the plurality of TRSs are different, or third parameters of at least some of the plurality of TRSs are the same; The third parameter includes at least one of the following: Frequency domain density; Time domain density; Occupied time domain resources; Occupied frequency domain resources; Transmission power; Cycle type; cycle; QCL reference.

45. A transmission device for a tracking reference signal, comprising: a transceiver unit, configured to send at least one tracking reference signal TRS; wherein the at least one TRS is used for time-frequency tracking; The TRS satisfies at least one of the following: The TRS occupies at least one first time domain unit and at least one second time domain unit, wherein the second time domain unit includes at least one first time domain unit; The TRS corresponds to at least one first sequence, where the first sequence is used for multiplexing of the TRS; The TRS corresponds to at least one first frequency domain range; The TRS corresponds to at least one repeat.

46. The device according to claim 45, in, In the case where the TRS occupies a plurality of first time domain units, the first parameters of the TRS in the plurality of first time domain units are all the same or at least partially different; The first parameter includes at least one of the following: Frequency domain density; Occupied frequency domain resources; Time domain density; Occupied time domain resources; Transmission power.

47. The apparatus of claim 45, wherein: In the case that the TRS occupies a plurality of second time domain units, at least some of the plurality of second time domain units are discontinuous, or at least some of the plurality of second time domain units are continuous.

48. The apparatus of claim 45, wherein In the case where the TRS corresponds to at least one first sequence, the first sequence corresponds to one of the following: A circular shift; An orthogonal cover code OCC sequence.

49. The device according to claim 45, in, In a case where the TRS corresponds to at least one first frequency domain range, the first frequency domain range includes M second frequency domain units, where M is a positive integer; The second frequency domain unit includes one of the following: RB, sub-band, bandwidth part BWP, sub-BWP.

50. The apparatus of claim 45, wherein In the case where the TRS corresponds to multiple repetitions, at least one of the following is satisfied between the multiple repetitions: The multiple repetitions are separated by K1 fourth time domain units; The starting time domain positions of the multiple repetitions are spaced apart by K2 fifth time domain units; The multiple repetitions are separated by K3 third frequency domain units; The starting frequency domain positions of the multiple repetitions are spaced apart by K4 fourth frequency domain units; Among them, K1 and K2 are both integers, and K1≥0, K2≥1; K3 and K4 are both integers, and K3≥0, K4≥1.

51. The apparatus according to any one of claims 45 to 50, wherein In a case where the transmission device of the tracking reference signal sends a plurality of TRSs, and the plurality of TRSs are used for joint measurement, the third parameters of at least some of the plurality of TRSs are different, or the third parameters of at least some of the plurality of TRSs are the same; The third parameter includes at least one of the following: Frequency domain density; Time domain density; Occupied time domain resources; Occupied frequency domain resources; Transmission power; Cycle type; cycle; QCL reference.

52. A terminal comprising a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method for transmitting a tracking reference signal according to any one of claims 1 to 18 are implemented.

53. A network-side device, comprising a transceiver, a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method for transmitting a tracking reference signal as described in any one of claims 19 to 35 are implemented.

54. A readable storage medium, wherein: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the steps of the method for transmitting a tracking reference signal as described in any one of claims 1 to 18, or implements the steps of the method for transmitting a tracking reference signal as described in any one of claims 19 to 35.

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