Time-frequency tracking method, apparatus, terminal, network side device, and readable storage medium

Abstract

The present application belongs to the technical field of communication, and discloses a time-frequency tracking method. The time-frequency tracking method in the embodiments of the present application comprises: a terminal receiving a first signal from a network side device, wherein the first signal comprises a second signal and a tracking reference signal (TRS); and the terminal performing time-frequency tracking on the basis of the first signal.

Description

Time-frequency tracking method, device, terminal, network-side device, and readable storage medium

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on January 19, 2024, with application number 202410084064.8 and application name “Time-frequency tracking method, device, terminal, network-side equipment and readable storage medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of communication technology, and specifically relates to a time-frequency tracking method, apparatus, terminal, network-side equipment, and readable storage medium. Background Art

[0003] In the New Radio (NR) system, the network-side device can send a Tracking Reference Signal (TRS) to the terminal so that the terminal can perform time and frequency tracking based on the TRS, thereby improving the transmission performance between the terminal and the network-side device.

[0004] However, due to the high resource usage of TRS, the overall TRS overhead in the network may be high. Furthermore, TRS measurement performance needs to be further improved to meet higher transmission performance requirements. Therefore, TRS-based time-frequency tracking needs to be further optimized. Summary of the Invention

[0005] The embodiments of the present application provide a time-frequency tracking method, apparatus, terminal, network-side device, and readable storage medium, which can solve the problem of high resource overhead of TRS of network-side devices.

[0006] In a first aspect, a time-frequency tracking method is provided, which is executed by a terminal. The method includes: the terminal receives a first signal from a network side device, where the first signal includes a second signal and a TRS; and the terminal performs time-frequency tracking based on the first signal.

[0007] In a second aspect, a time-frequency synchronization method is provided, which is executed by a network-side device. The method includes: the network-side device sends a first signal to the terminal, where the first signal includes a second signal and a TRS, and the first signal is used for time-frequency tracking.

[0008] In a third aspect, a time-frequency synchronization device is provided, comprising: a receiving module configured to receive a first signal from a network-side device, the first signal including a second signal and a TRS; and a tracking module configured to perform time-frequency tracking based on the first signal received by the receiving module.

[0009] In a fourth aspect, a time-frequency synchronization device is provided, which includes: a sending module, used to send a first signal to a terminal, where the first signal includes a second signal and a TRS, and the first signal is used for time-frequency tracking.

[0010] In a fifth aspect, a terminal is provided, comprising 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.

[0011] In a sixth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is used to receive a first signal from a network side device, the first signal comprising a second signal and a TRS, and the processor is used to perform time-frequency tracking based on the first signal.

[0012] In the seventh aspect, a network side device is provided, which includes 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.

[0013] In an eighth aspect, a network side device is provided, comprising a processor and a communication interface, wherein the communication interface is used to send a first signal to a terminal, the first signal comprising a second signal and a TRS, and the first signal is used for time-frequency tracking.

[0014] 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.

[0015] In the tenth aspect, a wireless communication system is provided, comprising: 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.

[0016] 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 steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0017] 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 described in the first aspect, or to implement the steps of the method described in the second aspect.

[0018] In an embodiment of the present application, a terminal may receive a first signal including a second signal and a TRS from a network-side device, and perform time-frequency tracking based on the first signal. Since the terminal can perform time-frequency tracking based on the second signal and the TRS, rather than based solely on the TRS, the network-side device may use fewer TRS resources to send the TRS to the terminal, thereby reducing TRS resource overhead. Furthermore, the joint measurement of the second signal and the TRS may further improve the performance of time-frequency tracking, thereby improving the transmission performance of the network.

[0019] In an embodiment of the present application, a network-side device may send a first signal including a second signal and a TRS to a terminal, wherein the first signal is used for time-frequency tracking. Since the network-side device may send the second signal and the TRS to the terminal so that the terminal can perform time-frequency tracking based on the second signal and the TRS, rather than only sending the TRS to the terminal, on the one hand, the network-side device may use fewer TRS resources to send the TRS to the terminal, thereby reducing TRS resource overhead; on the other hand, through the joint measurement of the second signal and the TRS, the performance of time-frequency tracking may be further improved, thereby improving the transmission performance of the network. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a block diagram of a wireless communication system provided in an embodiment of the present application;

[0021] FIG2 is a flow chart of a time-frequency tracking method according to an embodiment of the present invention;

[0022] FIG3 is a schematic diagram showing a multiplexing relationship between the second signal and the TRS for time division multiplexing;

[0023] FIG4 is a second schematic diagram of the multiplexing relationship between the second signal and the TRS for time division multiplexing;

[0024] FIG5 is a third schematic diagram of the multiplexing relationship between the second signal and the TRS for time division multiplexing;

[0025] FIG6 is a fourth schematic diagram of the multiplexing relationship between the second signal and the TRS for time division multiplexing;

[0026] FIG7 is a schematic diagram of a multiplexing relationship between the second signal and the TRS for frequency division multiplexing;

[0027] FIG8 is a second schematic diagram of the multiplexing relationship between the second signal and the TRS for frequency division multiplexing;

[0028] FIG9 is a third schematic diagram of the multiplexing relationship between the second signal and the TRS for frequency division multiplexing;

[0029] FIG10 is a fourth schematic diagram of the multiplexing relationship between the second signal and TRS for frequency division multiplexing;

[0030] FIG11 is a schematic diagram showing a relationship in which the second signal and the TRS at least partially overlap;

[0031] FIG12 is a second schematic diagram of an overlapping relationship in which the second signal and the TRS at least partially overlap;

[0032] FIG13 is a third schematic diagram of an overlapping relationship in which the second signal and the TRS at least partially overlap;

[0033] FIG14 is a fourth schematic diagram of an overlapping relationship in which the second signal and the TRS at least partially overlap;

[0034] FIG15 is a second flow chart of the time-frequency tracking method provided in an embodiment of the present application;

[0035] FIG16 is a schematic diagram of a structure of a time-frequency tracking method according to an embodiment of the present application;

[0036] FIG17 is a second structural diagram of the time-frequency tracking method provided in an embodiment of the present application;

[0037] FIG18 is a schematic diagram of the hardware structure of a communication device provided in an embodiment of the present application;

[0038] FIG19 is a schematic diagram of the hardware structure of a terminal provided in an embodiment of the present application;

[0039] Figure 20 is a schematic diagram of the hardware structure of the network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] 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.

[0041] The following describes the terms involved in the embodiments of the present application.

[0042] 1. Synchronous signal block

[0043] Typically, in a New Radio (NR) system, a synchronization signal block (SSB) is used for time and frequency synchronization for initial access.

[0044] Among them, SSB consists of the primary synchronization signal (PSS), the secondary synchronization signal (SSS), the physical broadcast channel (PBCH) and the demodulation reference signal (DMRS) of the PBCH.

[0045] The PSS and SSS are used for coarse time-frequency synchronization, the PBCH is used to carry the Master Information Block (MIB) for broadcast messages, and the DMRS of the PBCH is used for PBCH demodulation. Furthermore, the entire SSB occupies four Orthogonal Frequency-Division Multiplexing (OFDM) symbols in the time domain and a maximum of 20 Resource Blocks (RBs) in the frequency domain. Due to the limited time-frequency resources occupied by the SSB, only relatively preliminary coarse time-frequency synchronization can be performed based on the SSB.

[0046] When the terminal receives SSB, it can first detect PSS and obtain the physical cell ID based on sequence correlation. And obtain preliminary time-frequency synchronization; then detect SSS and obtain the physical cell ID based on sequence correlation Thus, the complete physical cell ID (PCI) is obtained, that is, The terminal can further adjust the frequency offset based on the PSS and SSS. The terminal then detects the DMRS of the PBCH to perform channel estimation and demodulate the PBCH.

[0047] 2. TRS

[0048] In the NR system, TRS is used for time-frequency tracking (more precise synchronization than SSB), 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 DMRS of the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) to complete more accurate channel estimation. In the design of the protocol Rel-15, TRS is used for terminals in the radio resource control (RRC) connected state, that is, when the terminal enters the RRC connected state, the time-frequency tracking performance is further adjusted based on the original SSB. In response to the terminal energy saving of Rel-17, TRS can also be used for time-frequency tracking of terminals in the non-connected state.

[0049] TRS is a special set of Channel State Information Reference Signal (CSI-RS) resources. For TRS deployed in Frequency Range (FR) 1 (low frequency), a terminal 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 in FR2 (high frequency), a terminal 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 a partial bandwidth (Bandwidth part, BWP) or min(52, BWP).

[0050] Assume that TRS is deployed in FR1, with a period of 20 time slots, a periodic offset of 5 slots, and a TRS symbol distribution within a slot of l∈{4,8}. The deployed BWP bandwidth is 20 MHz, and the subcarrier spacing (SCS) is 15 kHz. Therefore, the number of RBs containing TRS in the frequency domain is 52.

[0051] 3. Quasi Co-Location (QCL) Reference

[0052] In the NR system, QCL refers to the average channel delay, delay spread, Doppler frequency offset, Doppler spread, and spatial reception parameters experienced by the symbols on a certain antenna port, which can be inferred through another antenna port.

[0053] NR has designed four different types of QCL relationships to cope with different transmission scenarios. The specific QCL reference types are as follows:

[0054] 1) Type A: {Doppler frequency deviation, Doppler spread, average delay, delay spread};

[0055] 2) Type B: {Doppler frequency deviation, Doppler spread};

[0056] 3) Type C: {Doppler frequency deviation, average delay};

[0057] 4) TypeD: {space receiving parameters}.

[0058] 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 and frequency tracking performance, the network-side equipment can configure TRS for precise time and frequency synchronization. In this case, the reference source for the QCL reference Type A transmitted by PDCCH and PDSCH is TRS.

[0059] 4. Other terms

[0060] 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 do not limit the number of objects, 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 before and after are in an "or" relationship.

[0061] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication 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 indication 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, etc. based on the judgment result.

[0062] The terms "at least one" and "at least one of" in this application refer to any one, any two, or a combination of more than two of the objects included. For example, at least one of a, b, and c can be represented by: "a", "b", "c", "a and b", "a and c", "b and c", and "a, b, and c", where a, b, and c can be single or multiple. Similarly, "at least two" means two or more, and its meaning is similar to "at least one".

[0063] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application 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 illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0064] 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 (Tablet Personal Computer), a laptop computer (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 (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted 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), an ATM, 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, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a 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. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AS) or a wireless fidelity (WiFi) node, etc.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.

[0065] The time-frequency tracking method, apparatus, terminal, network-side device, and readable storage medium provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

[0066] The time-frequency tracking method provided in the embodiment of the present application can be executed by a time-frequency tracking device, a terminal, or a functional module or entity in the terminal. The embodiment of the present application takes the execution of the time-frequency tracking method by the terminal as an example to illustrate the time-frequency tracking method provided in the embodiment of the present application.

[0067] FIG2 shows a flow chart of a time-frequency tracking method provided by an embodiment of the present application. As shown in FIG2 , the time-frequency tracking method provided by an embodiment of the present application may include the following steps 101 and 102.

[0068] Step 101: A terminal receives a first signal from a network-side device.

[0069] In the embodiment of the present application, the first signal includes the second signal and TRS.

[0070] In some embodiments of the present application, the second signal may include at least one of the following: an SSB, a demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS). Of course, the second signal may also include other reference signals, which are not limited in the embodiments of the present application, and those skilled in the art may select them as needed.

[0071] Optionally, the above-mentioned SSB may include at least one of the following: a synchronization signal, a broadcast signal, a broadcast channel, a DMRS of a broadcast channel, a reference signal for time domain tracking or frequency domain tracking, and other system message downlink broadcast channels.

[0072] The synchronization signal may include at least one of the following: a PSS and an SSS. Each of the PSS and SSS includes at least one of the following: a synchronization sequence, a synchronization pilot, and a reference signal for time domain tracking or frequency domain tracking. Of course, the synchronization signal may also include other signals, which are not limited in the present embodiment. Persons skilled in the art may select other signals based on their needs.

[0073] The broadcast channel may include at least one of the following: a master information block broadcast channel, a synchronization channel, and other system message broadcast channels.

[0074] Optionally, the TRS may include one or more reference signals for time-frequency tracking.

[0075] In some embodiments of the present application, the number of the first signal may be at least one, the number of the second signal may be at least one, and the number of the TRS may be at least one. The number of the second signal and the TRS may be the same or different.

[0076] In some embodiments of the present application, the second signal and the TRS may be multiplexed or not. When multiplexing is not performed, the terminal measures the second signal and the TRS separately, and does not perform a joint measurement of the two.

[0077] In some embodiments of the present application, before the above step 102, the time-frequency tracking method provided by the embodiment of the present application may further include the following step 201.

[0078] Step 201: The terminal determines at least one of the following based on the first information:

[0079] Whether the second signal and TRS are multiplexed;

[0080] The second signal and TRS are multiplexed.

[0081] In an embodiment of the present application, the above-mentioned first information is information configured or indicated by the network side device for the terminal, or information agreed upon in the protocol.

[0082] It should be noted that the present embodiment does not limit the execution order of the above steps 201 and 101. In one example, the terminal may first execute step 201 and then execute step 101; in another example, the terminal may first execute step 101 and then execute step 201; in yet another example, the terminal may execute step 101 simultaneously with step 201.

[0083] Optionally, the first information may include at least one of the following:

[0084] Configuration information sent by the network side device to the terminal;

[0085] Instruction information sent by the network side device to the terminal;

[0086] a synchronization signal in the second signal;

[0087] a cell identifier corresponding to the second signal;

[0088] a DMRS of a broadcast channel in the second signal;

[0089] Synchronous grid;

[0090] the index of the second signal;

[0091] System messages;

[0092] Layer 1 load;

[0093] Random access response message.

[0094] The random access response message may include at least one of the following: Msg 2, Msg 4, and Msg B.

[0095] In the embodiment of the present application, the first information may be specifically used to indicate at least one of the following multiplexing information: whether the second signal and the TRS are multiplexed, and the manner in which the second signal and the TRS are multiplexed.

[0096] Optionally, the network side device may further indicate, through the first information, when the second signal and the TRS are multiplexed, such as a period ratio of multiplexing of the two, or a time domain position (e.g., a time slot) at which the TRS or the second signal appears. The indication may be performed by determining the time domain position of the TRS or the second signal in the form of a bitmap.

[0097] Optionally, the network-side device may further indicate the first message through downlink control information (DCI), for example, the DCI is group-common DCI.

[0098] It can be seen that since the terminal can accurately determine the multiplexing information of the second signal and TRS through the first information, in the subsequent steps, the terminal can accurately determine the method of time-frequency tracking based on the multiplexing information of the second signal and TRS, thereby improving the performance of the terminal in time-frequency tracking.

[0099] In some embodiments of the present application, the manner of multiplexing the second signal and the TRS includes one of the following:

[0100] The second signal and TRS are time-division multiplexed;

[0101] The second signal and the TRS are frequency-division multiplexed;

[0102] The second signal and the TRS at least partially overlap.

[0103] In the embodiment of the present application, the manner of multiplexing the above-mentioned second signal and TRS may be agreed upon by the protocol or configured by a network-side device.

[0104] The time-division multiplexing of the second signal and the TRS can be understood as follows: the time domain resources occupied by the second signal are different from the time domain resources occupied by the TRS, that is, the second signal and the TRS are located on different time domain resources. When the second signal and the TRS are time-division multiplexed, the second signal and the TRS are combined into a joint measurement pattern in the time domain, thereby increasing the time span or number of time units occupied by the second signal or the TRS.

[0105] The frequency division multiplexing of the second signal and the TRS can be understood as follows: the frequency domain resources occupied by the second signal are different from the frequency domain resources occupied by the TRS, that is, the second signal and the TRS are located on different frequency domain resources. When the second signal and the TRS are frequency-division multiplexed, the second signal and the TRS are combined in the frequency domain to form a joint measurement pattern, thereby increasing the bandwidth of the second signal or the TRS.

[0106] Among them, the above-mentioned at least partial overlap between the second signal and the TRS can be understood as: at least part of the time-frequency domain resources occupied by the second signal and at least part of the time-frequency domain resources occupied by the TRS overlap or conflict, that is, the second signal and the TRS overlap or conflict in the time-frequency domain resources. In the case where the second signal and the TRS at least partially overlap, the second signal and the TRS can be combined into a joint measurement pattern, thereby reducing the time-frequency domain resources occupied by the TRS or SSB.

[0107] It can be seen that since the embodiments of the present application specify different ways of multiplexing the second signal and TRS, the terminal can use corresponding different methods to perform time-frequency tracking according to the different ways of multiplexing the second signal and TRS, rather than using a default method to perform time-frequency tracking. Therefore, the flexibility of the terminal in performing time-frequency tracking can be improved.

[0108] In some embodiments of the present application, the second signal and the TRS are time-division multiplexed, including at least one of the following modes:

[0109] First mode: In the first mode, the last first time unit occupied by the second signal is the Pth first time unit before the first first time unit occupied by the TRS, where P≥0;

[0110] The second mode, in the second mode, the last first time unit occupied by the TRS is the Qth first time unit before the first first time unit occupied by the second signal, Q ≥ 0;

[0111] The third mode. In the third mode, the first first time unit occupied by the second signal is the Sth first time unit after the first first time unit occupied by TRS, and the last first time unit occupied by the second signal is the Tth first time unit before the last first time unit occupied by TRS, S≥0, T≥0.

[0112] In the case where the second signal and the TRS are time-division multiplexed including the first mode, if P=0, it can be considered that the last first time unit occupied by the second signal and the first first time unit occupied by the TRS are the same first time unit.

[0113] In the case where the second signal and TRS are time-division multiplexed including the second mode, if Q=0, it can be considered that the last first time unit occupied by the TRS and the first first time unit occupied by the second signal are the same first time unit.

[0114] Among them, when the second signal and TRS are time-division multiplexed including the third mode, if S=0, it can be considered that the first first time unit occupied by the second signal and the first first time unit occupied by TRS are the same first time unit; if T=0, the last first time unit occupied by the second signal and the last first time unit occupied by TRS are the same first time unit.

[0115] Optionally, the first time unit may be any one of the following: a symbol, a time slot, a sub-time slot, a frame, or a subframe.

[0116] It can be seen that since the embodiment of the present application stipulates different modes of time division multiplexing of the second signal and TRS, the terminal can use corresponding different methods to perform targeted time and frequency tracking according to the characteristics of the different modes of time division multiplexing of the second signal and TRS, rather than using a default method for time and frequency tracking. Therefore, the performance of the terminal in time and frequency tracking can be improved.

[0117] Two different examples are used below to illustrate the mode of time division multiplexing of the second signal and the TRS.

[0118] Example 1: The mode in which the second signal and the TRS are time-division multiplexed is the first mode.

[0119] Case 1, as shown in Figure 3, assumes that a TRS occupies two first time units, such as OFDM symbols, and the TRSs on the two OFDM symbols are respectively called TRS 1 and TRS 2. TRS 1 and TRS 2 belong to the same TRS resource or resource set. TRS 1 and TRS 2 are located in two OFDM symbols of a time slot (for example, time slot n), and the second signal (for example, SSB) occupies four first time units, for example, OFDM symbols, that is, synchronization signal 1 in SSB occupies 1 OFDM symbol, broadcast channel 1 in SSB occupies 1 OFDM symbol, synchronization signal 2 in SSB occupies 1 OFDM symbol, broadcast channel 2 in SSB occupies 1 OFDM symbol, and the TRS and SSB are located in the same time slot (that is, time slot n). Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, the last OFDM symbol occupied by SSB (ie, the OFDM symbol occupied by broadcast channel 2 in SSB) is the first P OFDM symbols of the first OFDM symbol occupied by TRS (ie, the OFDM symbol occupied by TRS 1), where P=2.

[0120] It can be understood that in subsequent steps (such as step 102), the terminal can use the synchronization signal and TRS in the SSB to perform time-frequency tracking, such as jointly using the synchronization signal and TRS in the SSB to estimate frequency deviation and Doppler spread, and can also use TRS to further improve the estimation performance of timing and delay spread.

[0121] Case 2, as shown in Figure 4, assumes that a TRS occupies four first time units, such as OFDM symbols. The TRSs on the four OFDM symbols are respectively referred to as TRS 1 to TRS 4. TRS 1 to TRS 4 belong to the same TRS resource or resource set. TRS 1 and TRS 2 are located in two OFDM symbols of one time slot (e.g., time slot n), TRS 3 and TRS 4 are located in two OFDM symbols of another time slot (e.g., time slot n+1), and the second signal (e.g., SSB) occupies four first time units, such as OFDM symbols. That is, synchronization signal 1 in the SSB occupies one OFDM symbol, broadcast channel 1 in the SSB occupies one OFDM symbol, synchronization signal 2 in the SSB occupies one OFDM symbol, and broadcast channel 2 in the SSB occupies one OFDM symbol. The SSB is located in the aforementioned time slot (i.e., time slot n). Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, the last OFDM symbol occupied by SSB (ie, the OFDM symbol occupied by broadcast channel 2 in SSB) is the first P OFDM symbols of the first OFDM symbol occupied by TRS (ie, the OFDM symbol occupied by TRS 1), where P=2.

[0122] It can be understood that the joint measurement pattern shown in FIG4 can provide more excellent time-frequency synchronization performance, especially for Doppler spread estimation, because there are more OFDM symbols in the time domain, so that its estimation performance is improved.

[0123] Example 2: The mode in which the second signal and TRS are time-division multiplexed is the third mode.

[0124] Case 3, as shown in Figure 5, assume that a TRS occupies 2 first time units, such as OFDM symbols, and the TRSs on the 2 OFDM symbols are respectively called TRS 1 and TRS 2. TRS 1 and TRS 2 belong to the same TRS resource or resource set. TRS 1 and TRS 2 are located in 2 OFDM symbols of a time slot (such as time slot n), and the second signal (such as SSB) occupies 4 first time units, such as OFDM symbols, that is, the synchronization signal 1 in the SSB occupies 1 OFDM symbol, the broadcast channel 1 in the SSB occupies 1 OFDM symbol, the synchronization signal 2 in the SSB occupies 1 OFDM symbol, and the broadcast channel 2 in the SSB occupies 1 OFDM symbol, and the two TRSs and SSB are located in the same time slot (that is, time slot n), wherein the broadcast channel 1 and the broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, the first OFDM symbol occupied by SSB (i.e., the OFDM symbol occupied by synchronization signal 1 in SSB) is the Sth OFDM symbol after the first OFDM symbol occupied by TRS (i.e., the OFDM symbol occupied by TRS 1), S=2, and the last OFDM symbol occupied by SSB (i.e., the OFDM symbol occupied by broadcast channel 2 in SSB) is the Tth OFDM symbol before the last OFDM symbol occupied by TRS (i.e., the OFDM symbol occupied by TRS 2), T=1.

[0125] As can be understood, all symbols occupied by SSB in Figure 5 are within the two symbols occupied by TRS. This joint measurement pattern has a compact overall occupancy, which is beneficial for resource scheduling and helps terminals quickly perform time-frequency synchronization.

[0126] Case 4, as shown in Figure 6, assumes that a TRS occupies four first time units, such as OFDM symbols. The TRSs on the four OFDM symbols are respectively referred to as TRS 1 to TRS 4. TRS 1 to TRS 4 belong to the same TRS resource or resource set. TRS 1 and TRS 2 are located in two OFDM symbols of one time slot (e.g., time slot n), TRS 3 and TRS 4 are located in two OFDM symbols of another time slot (e.g., time slot n+1), and the second signal (e.g., SSB) occupies four first time units, such as OFDM symbols. That is, synchronization signal 1 in the SSB occupies one OFDM symbol, broadcast channel 1 in the SSB occupies one OFDM symbol, synchronization signal 2 in the SSB occupies one OFDM symbol, and broadcast channel 2 in the SSB occupies one OFDM symbol. The SSB is located between time slot n and time slot n+1, that is, part of the signal of the SSB is located in time slot n, and another part of the signal is located in time slot n+1. It should be noted that the SSB may also be located in time slot n or time slot n+1.

[0127] In some embodiments of the present application, when the second signal and the TRS are time-division multiplexed, at least one of the following conditions is satisfied between the second signal and the TRS:

[0128] The bandwidth of the second signal is within the bandwidth of the TRS;

[0129] The second signal and the TRS are located in the same second time unit;

[0130] The second signal and the TRS are separated by X second time units in the time domain, where X≥1.

[0131] Optionally, the second time unit may be any one of the following: an OFDM symbol, a sub-time slot, a time slot, a frame, or a sub-frame.

[0132] Optionally, the value of X may be pre-configured by the network-side device or agreed upon by a protocol.

[0133] Exemplarily, assuming X=1, the second signal and the TRS are separated by one second time unit (eg, time slot) in the time domain, that is, the second signal and the TRS are respectively located in adjacent time slots.

[0134] It can be seen that since the embodiments of the present application specify the conditions that need to be met between the second signal and TRS when the second signal and TRS are time-division multiplexed, the terminal can accurately perform time-frequency tracking based on the above conditions when determining that the second signal and TRS are time-division multiplexed, thereby improving the performance of the terminal in time-frequency tracking.

[0135] In some embodiments of the present application, the second signal and the TRS are frequency-division multiplexed, including at least one of the following modes:

[0136] a fourth mode, in which the bandwidth of the second signal is adjacent to the bandwidth of the TRS;

[0137] The fifth mode: In the fifth mode, the second signal and the TRS are separated by Y first frequency domain units in the frequency domain, where Y ≥ 1;

[0138] The sixth mode: In the sixth mode, the bandwidth of the second signal and the bandwidth of the TRS overlap, and the second frequency domain unit occupied by the second signal and the second frequency domain unit occupied by the TRS are different.

[0139] Optionally, the bandwidth of the second signal is adjacent to the bandwidth of the TRS, including at least one of the following:

[0140] The bandwidth of the synchronization signal in the second signal is adjacent to the bandwidth of the TRS;

[0141] The bandwidth of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS;

[0142] The bandwidth of the DMRS of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS;

[0143] The maximum bandwidth of all signals in the second signal is adjacent to the bandwidth of the TRS.

[0144] It can be seen that since the embodiments of the present application stipulate multiple situations in which the bandwidth of the second signal and the bandwidth of the TRS are adjacent when the second signal and the TRS are frequency-division multiplexed, the terminal can accurately perform time-frequency tracking based on the above-mentioned multiple situations when determining that the second signal and the TRS are frequency-division multiplexed, thereby improving the performance of the terminal in performing time-frequency tracking.

[0145] Optionally, the value of Y may be pre-configured by the network-side device or agreed upon by a protocol.

[0146] Optionally, the first frequency domain unit may be any one of the following: resource element (RE), RB, RB group, subcarrier, carrier, subband, frequency band.

[0147] Optionally, the second frequency domain unit may be any one of the following: RE, RB, RB group, subcarrier, carrier, subband, or frequency band.

[0148] For example, if the bandwidth of the second signal overlaps with the bandwidth of the TRS, and the second frequency domain unit occupied by the second signal is different from the second frequency domain unit occupied by the TRS, it can be understood that the TRS and the second signal do not overlap at the RE level (i.e., frequency division multiplexing at the RE level). For example, the synchronization signal of the TRS and the SSB do not overlap at the RE level.

[0149] It can be seen that since the embodiment of the present application stipulates different modes of frequency division multiplexing of the second signal and TRS, the terminal can use corresponding different methods to perform targeted time-frequency tracking according to the characteristics of the different modes of frequency division multiplexing of the second signal and TRS, rather than using a default method for time-frequency tracking. Therefore, the performance of the terminal in time-frequency tracking can be improved.

[0150] In some embodiments of the present application, the time domain resources occupied by the second signal and the time domain resources occupied by the TRS satisfy at least one of the following conditions:

[0151] The first third time unit occupied by the second signal is the same as the first third time unit occupied by the TRS;

[0152] The last third time unit occupied by the second signal is the same as the last third time unit occupied by the TRS;

[0153] The third time unit occupied by the synchronization signal in the second signal is the same as at least part of the third time unit occupied by the TRS;

[0154] The third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as at least part of the third time unit occupied by the TRS;

[0155] At least part of the third time unit occupied by the synchronization signal in the second signal is the same as the third time unit occupied by the TRS;

[0156] At least a portion of the third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as the third time unit occupied by the TRS.

[0157] Optionally, the third time unit may be any one of the following: an OFDM symbol, a time slot, a sub-time slot, a frame, or a sub-frame.

[0158] Optionally, when the time domain resources occupied by the second signal and the time domain resources occupied by the TRS satisfy that the first third time unit occupied by the second signal and the first third time unit occupied by the TRS are the same, it can be understood that the starting time domain positions of the second signal and the TRS are the same or aligned.

[0159] Optionally, when the time domain resources occupied by the second signal and the time domain resources occupied by the TRS satisfy that the last third time unit occupied by the second signal and the last third time unit occupied by the TRS are the same, it can be understood that the last time domain position of the second signal and the TRS is the same or aligned.

[0160] Optionally, when the time domain resources occupied by the second signal and the time domain resources occupied by the TRS satisfy that the third time unit occupied by the synchronization signal in the second signal and at least part of the third time unit occupied by the TRS are the same, it can be understood that the time domain position of the synchronization signal in the second signal is the same as or aligned with at least part of the time domain position of the TRS.

[0161] Exemplarily, assuming that the second signal is SSB and the synchronization signal in the SSB is PSS, then when the time domain resources occupied by the second signal and the time domain resources occupied by TRS satisfy that the third time unit occupied by the synchronization signal in the second signal and at least part of the third time unit occupied by TRS are the same, the time domain position of the PSS in the SSB can be aligned with the first symbol of TRS, or, multiple PSSs in the SSB can be aligned with multiple symbols of TRS.

[0162] As another example, assuming that the second signal is SSB and the synchronization signal in the SSB is SSS, then when the time domain resources occupied by the second signal and the time domain resources occupied by the TRS satisfy that the third time unit occupied by the synchronization signal in the second signal and at least part of the third time unit occupied by the TRS are the same, the time domain position of the SSS in the SSB can be aligned with the first symbol of the TRS, or, multiple SSSs in the SSB can be aligned with multiple symbols of the TRS.

[0163] It can be seen that since the embodiment of the present application stipulates the conditions that need to be met between the time domain resources occupied by the second signal and the time domain resources occupied by the TRS, when the terminal determines that the second signal and TRS are frequency-division multiplexed, it can accurately perform time-frequency tracking based on the above conditions, thereby improving the performance of the terminal in time-frequency tracking.

[0164] The following example illustrates a mode in which the second signal and the TRS are frequency-division multiplexed.

[0165] Example 3: The mode in which the second signal and the TRS are frequency-division multiplexed is the fourth mode.

[0166] Case 5: As shown in Figure 7, assume that two TRSs each occupy two third time units, such as OFDM symbols. The TRSs on one OFDM symbol are called TRS 1 and TRS 2, and the TRSs on another OFDM symbol are called TRS 3 and TRS 4. TRS 1 and TRS 3 belong to one TRS resource or resource set, TRS 2 and TRS 4 belong to another TRS resource or resource set, and the second signal (e.g., SSB) occupies four third time units, such as OFDM symbols. That is, synchronization signal 1 in the SSB occupies one OFDM symbol, broadcast channel 1 in the SSB occupies one OFDM symbol, synchronization signal 2 in the SSB occupies one OFDM symbol, and broadcast channel 2 in the SSB occupies one OFDM symbol. The two TRSs and SSB are located in the same time slot. Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, TRS 1 and TRS 2 can be aligned with synchronization signal 1 in SSB, TRS 3 and TRS 4 can be aligned with synchronization signal 2, and the bandwidth of TRS 1 to TRS 4 is adjacent to the bandwidth of synchronization signal 1 and synchronization signal 2.

[0167] Case 6. As shown in Figure 8, assume that two TRSs each occupy two third time units, such as OFDM symbols. The TRSs on one OFDM symbol are called TRS 1 and TRS 2, and the TRSs on the other OFDM symbol are called TRS 3 and TRS 4. TRS 1 and TRS 3 belong to one TRS resource or resource set, TRS 2 and TRS 4 belong to another TRS resource or resource set, and the second signal (e.g., SSB) occupies four third time units, such as OFDM symbols. That is, synchronization signal 1 in the SSB occupies one OFDM symbol, broadcast channel 1 in the SSB occupies one OFDM symbol, synchronization signal 2 in the SSB occupies one OFDM symbol, and broadcast channel 2 in the SSB occupies one OFDM symbol. The two TRSs and SSB are located in the same time slot. Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, TRS 1 and TRS 2 are aligned with Sync Signal 1 in SSB, and the bandwidth of TRS 1 and TRS 2 is adjacent to the bandwidth of Sync Signal 1.

[0168] Case 7: As shown in Figure 9 or Figure 10, assume that two TRSs each occupy two third time units, such as OFDM symbols. The TRSs on one OFDM symbol are respectively called TRS 1 and TRS 2, and the TRSs on the other OFDM symbol are respectively called TRS 3 and TRS 4. TRS 1 and TRS 3 belong to one TRS resource or resource set, TRS 2 and TRS 4 belong to another TRS resource or resource set, and the second signal (e.g., SSB) occupies four third time units, such as OFDM symbols. That is, synchronization signal 1 in the SSB occupies one OFDM symbol, broadcast channel 1 in the SSB occupies one OFDM symbol, synchronization signal 2 in the SSB occupies one OFDM symbol, and broadcast channel 2 in the SSB occupies one OFDM symbol. The two TRSs and SSB are located in the same time slot. Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. Thus, as shown in FIG9 , TRS 1 and TRS 2 are aligned with sync signal 2 in SSB, and the bandwidths of TRS 1 and TRS 2 are adjacent to the bandwidth of sync signal 2. Alternatively, as shown in FIG10 , TRS 3 and TRS 4 are aligned with sync signal 2 in SSB, and the bandwidths of TRS 3 and TRS 4 are adjacent to the bandwidth of sync signal 2.

[0169] By using the joint measurement patterns of TRS and SSB in the fifth, sixth, and seventh cases above, the bandwidth of TRS and SSB can be effectively increased, thereby effectively improving the performance of time-frequency estimation.

[0170] In some embodiments of the present application, the second signal and the TRS at least partially overlap, including at least one of the following modes:

[0171] a seventh mode, in which the synchronization signal and the TRS in the second signal at least partially overlap;

[0172] an eighth mode, in which the broadcast channel and the TRS in the second signal at least partially overlap;

[0173] Ninth mode: In the ninth mode, the broadcast channel DMRS and TRS in the second signal at least partially overlap.

[0174] It can be seen that since the embodiment of the present application stipulates different overlapping methods of the second signal and TRS, the terminal can use corresponding different methods to perform targeted time-frequency tracking according to the characteristics of the different overlapping methods of the second signal and TRS, rather than using a default method to perform time-frequency tracking. Therefore, the performance of the terminal in time-frequency tracking can be improved.

[0175] In some embodiments of the present application, the pattern in which the second signal and the TRS at least partially overlap is determined by at least one of the following:

[0176] a synchronization signal in the second signal;

[0177] a cell identifier corresponding to the second signal;

[0178] a DMRS of a broadcast channel in the second signal;

[0179] Synchronous grid;

[0180] the index of the second signal;

[0181] System messages;

[0182] Layer 1 load;

[0183] Random access response message.

[0184] As can be seen, since the embodiment of the present application specifies a method for determining a mode in which the second signal and the TRS at least partially overlap, the terminal can accurately determine the overlapping mode of the second signal and the TRS based on the determination method.

[0185] In some embodiments of the present application, when the second signal and the TRS at least partially overlap, before the above step 102, the time-frequency tracking method provided by the embodiment of the present application may further include the following step 202.

[0186] Step 202: The terminal performs a first operation on the third signal.

[0187] In an embodiment of the present application, the third signal includes at least one of the following: a signal in the second signal that overlaps with the TRS, and a signal in the TRS that overlaps with the second signal; the first operation includes one of the following: discarding, puncturing, and rate matching.

[0188] It can be understood that the third signal is a signal in the first signal.

[0189] In some embodiments of the present application, when the third signal includes a signal in the second signal that overlaps with the TRS, the signal in the second signal that overlaps with the TRS includes a reserved signal portion in the second signal. It is understood that the reserved signal in the second signal at least partially overlaps with the TRS.

[0190] In some embodiments of the present application, when the third signal includes a signal in the TRS that overlaps with the second signal, the signal in the TRS that overlaps with the second signal includes a reserved signal portion in the TRS. It can be understood that the second signal and the reserved signal in the TRS at least partially overlap.

[0191] It should be noted that the above-mentioned “reserved signal portion” can be understood as: a signal portion where the signal is 0, or is empty, or is not occupied.

[0192] In some embodiments of the present application, the determination of the third signal may be configured by a network-side device or agreed upon by a protocol.

[0193] In some embodiments of the present application, after the terminal performs the first operation on the third signal, the terminal may perform time-frequency tracking based on the first signal after performing the first operation.

[0194] It can be seen that before the terminal performs time-frequency tracking based on the first signal, the terminal can first perform at least one operation of discarding, punching and rate matching on the third signal in the first signal (that is, at least one of the signals in the second signal that overlap with the TRS and the signals in the TRS that overlap with the second signal). Therefore, the signal overhead used for time-frequency tracking can be reduced, and it is also beneficial to reduce the complexity of the terminal's time-frequency tracking.

[0195] The following takes the case where the first operation includes discarding as an example to illustrate a specific solution in which the terminal performs the first operation on the third signal.

[0196] Example 4: The first operation is discarding, and the third signal is a signal in the second signal that overlaps with the TRS.

[0197] Case 8, as shown in Figure 11, assumes that a TRS includes TRS 1 and TRS 2, where TRS 1 and TRS 2 belong to the same TRS resource or resource set. The second signal (e.g., SSB) includes synchronization signal 1, broadcast channel 1, synchronization signal 2, and broadcast channel 2. TRS 1 overlaps with synchronization signal 1, and TRS 2 overlaps with synchronization signal 2. Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, the terminal can directly discard synchronization signal 1 and synchronization signal 2.

[0198] It should be noted that the synchronization signal 1 and the synchronization signal 2 are indicated by dashed boxes in FIG11 .

[0199] Case 9, as shown in Figure 12, assumes that a TRS includes TRS 1 and TRS 2, where TRS 1 and TRS 2 belong to the same TRS resource or resource set. The second signal (e.g., SSB) includes synchronization signal 1, broadcast channel 1, synchronization signal 2, and broadcast channel 2, and TRS 1 overlaps with synchronization signal 1. Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this case, the terminal can directly discard synchronization signal 1.

[0200] It should be noted that the synchronization signal 1 is indicated by a dotted frame in FIG12 .

[0201] It can be understood that this can help reduce the SSB overhead while ensuring the time-frequency estimation performance as much as possible.

[0202] Example 5: The first operation is discarding, and the third signal is a signal in the TRS that overlaps with the second signal.

[0203] Case 10, as shown in Figure 13, assumes that a TRS includes TRS 1 and TRS 2, where TRS 1 and TRS 2 belong to the same TRS resource or resource set. The second signal (for example, SSB) includes synchronization signal 1, broadcast channel 1, synchronization signal 2, and broadcast channel 2, and part of the signal of TRS 1 overlaps with synchronization signal 1, and part of the signal of TRS 2 overlaps with synchronization signal 2, where broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, the terminal can directly discard the part of the signal of TRS 1 that overlaps with synchronization signal 1, and the part of the signal of TRS 2 that overlaps with synchronization signal 2 in the TRS.

[0204] In case 11, as shown in Figure 14, assume that a TRS includes TRS 1 and TRS 2, where TRS 1 and TRS 2 belong to the same TRS resource or resource set. The second signal (e.g., SSB) includes synchronization signal 1, broadcast channel 1, synchronization signal 2, and broadcast channel 2, and part of the signal of TRS 1 overlaps with synchronization signal 1. Broadcast channel 1 and broadcast channel 2 can also be understood as two parts of the same broadcast signal. In this way, the terminal can directly discard the part of the TRS signal where TRS 1 overlaps with synchronization signal 1.

[0205] It can be understood that this can help reduce the TRS overhead while ensuring the time-frequency estimation performance as much as possible.

[0206] In some embodiments of the present application, at least one of the following conditions is satisfied between the second signal and the TRS:

[0207] The bandwidth of the second signal is within the bandwidth of the TRS;

[0208] The bandwidth of the TRS is within the bandwidth of the second signal;

[0209] The time domain resources occupied by the second signal overlap with the time domain resources occupied by the TRS;

[0210] The time domain resources occupied by the synchronization signal in the second signal overlap with the time domain resources occupied by the TRS;

[0211] The time domain resources occupied by the DMRS of the broadcast channel in the second signal overlap with the time domain resources occupied by the TRS.

[0212] Optionally, when the second signal and TRS at least partially overlap, at least one of the following conditions is satisfied between the second signal and TRS: the bandwidth of the second signal is within the bandwidth of the TRS; the bandwidth of the TRS is within the bandwidth of the second signal; the time domain resources occupied by the second signal and the time domain resources occupied by the TRS overlap; the time domain resources occupied by the synchronization signal in the second signal and the time domain resources occupied by the TRS overlap; the time domain resources occupied by the DMRS of the broadcast channel in the second signal and the time domain resources occupied by the TRS overlap.

[0213] Optionally, when the second signal and the TRS satisfy that the bandwidth of the second signal is within the bandwidth of the TRS, and the bandwidth of the TRS is within the bandwidth of the second signal, it can be understood that the bandwidth of the second signal is the same as the bandwidth of the TRS.

[0214] Optionally, when the time domain resources occupied by the second signal and the time domain resources occupied by the TRS overlap between the second signal and the TRS, the time domain resources occupied by the second signal and the time domain resources occupied by the TRS can all overlap, that is, the time domain resources occupied by the second signal and the time domain resources occupied by the TRS are the same.

[0215] It can be seen that since the embodiments of the present application stipulate the conditions that need to be met between the second signal and TRS when the second signal and TRS at least partially overlap, the terminal can accurately perform time-frequency tracking based on the above conditions when determining that the second signal and TRS at least partially overlap, thereby improving the performance of the terminal in time-frequency tracking.

[0216] In some embodiments of the present application, the sequence of the TRS satisfies at least one of the following:

[0217] The TRS sequence is of the same type as the synchronization signal sequence in the second signal;

[0218] The starting position of the TRS sequence generation is the same as the starting position of the synchronization signal sequence generation in the second signal;

[0219] The type of the TRS sequence is determined based on whether the TRS is multiplexed with the second signal;

[0220] Initialization of the TRS sequence is related to the first identifier, and the first identifier is determined based on the second signal;

[0221] The initialization of the TRS sequence is related to the second identifier configured or indicated by the network side device.

[0222] Optionally, when the TRS sequence satisfies the type of the TRS sequence and the synchronization signal sequence in the second signal, the TRS sequence and the synchronization signal sequence in the second signal can both be m sequences, or ZC (Zadoff-Chu) sequences, or gold sequences, or computer generated sequence (CGS) sequences.

[0223] Optionally, when the TRS sequence satisfies the same starting position of the TRS sequence generation as the starting position of the synchronization signal sequence generation in the second signal, the TRS sequence and the synchronization signal sequence in the second signal can both be generated starting from common RB#0 or point A.

[0224] It can be understood that the starting position of the sequence generation of the TRS is the same as the starting position of the sequence generation of the synchronization signal in the second signal, which can ensure the continuity of the second signal after overlapping with the TRS.

[0225] Optionally, when the sequence of TRS satisfies that the type of the sequence of TRS is determined based on whether the TRS is multiplexed with the second signal, it can be understood that when the TRS is multiplexed with the second signal, the type of the sequence of TRS can be one type, and when the TRS is not multiplexed with the second signal, the type of the sequence of TRS can be another type.

[0226] It should be noted that, as to whether the TRS is multiplexed with the second signal and the specific multiplexing method, reference may be made to the specific description in the above embodiment, and the embodiments of the present application will not be repeated here.

[0227] Optionally, the first identifier may be a cell ID. The cell ID may include at least one of the following: Physical cell ID

[0228] Optionally, the second identifier may include at least one of the following: an ID configured or indicated by a network-side device. The ID may be associated with at least one of the following: a PBCH, a Master Information Block (MIB), a layer 1 payload, a DMRS, or a synchronization signal in the second signal. Being associated with the DMRS includes being associated with a DMRS sequence; and being associated with the synchronization signal in the second signal includes being associated with a PSS and / or SSS of an SSB.

[0229] It can be seen that since the conditions that the TRS sequence needs to meet are specified in the embodiment of the present application, the terminal can accurately perform time-frequency tracking based on the above conditions, thereby improving the performance of the terminal in time-frequency tracking.

[0230] In some embodiments of the present application, there is at least one of the following associations between the second signal and the TRS:

[0231] There is a correlation between the second signal and the Quasi Co-Located (QCL) reference relationship of the TRS;

[0232] There is a correlation between the transmission power of the second signal and the transmission power of the TRS;

[0233] There is a correlation between the transmission period of the second signal and the transmission period of the TRS.

[0234] Optionally, the above-mentioned QCL reference relationship may include at least one of the following: beam relationship, spatial relationship.

[0235] For example, when the second signal and the TRS are time-division multiplexed, the QCL references of the second signal and the TRS are associated, for example, the QCL references of the second signal and the TRS are the same, or the QCL reference of the TRS is the second signal, or the QCL reference of the second signal is the TRS.

[0236] Optionally, when there is a correlation between the transmission power of the second signal and the transmission power of the TRS, the transmission power of the second signal and the transmission power of the TRS may be the same, or the transmission power of both may be less than a certain threshold, or the transmission power difference between the two may be less than a certain threshold.

[0237] Optionally, in the case where there is an association between the transmission period of the second signal and the transmission period of the TRS, the transmission period of the second signal and the transmission period of the TRS may be the same or have a multiple relationship.

[0238] It can be seen that, since the association relationship between the second signal and the TRS is specified in the embodiment of the present application, the terminal can accurately receive the second signal and the TRS based on the association relationship, thereby improving the performance of time-frequency synchronization.

[0239] In some embodiments of the present application, when the terminal is in an RRC connected state or a non-connected state, the terminal may receive a first signal from a network side device.

[0240] Step 102: The terminal performs time-frequency tracking based on the first signal.

[0241] In some embodiments of the present application, the terminal may perform measurement based on the first signal and perform time-frequency tracking according to the measurement result.

[0242] An embodiment of the present application provides a time-frequency tracking method, in which a terminal can receive a first signal including a second signal and a TRS from a network-side device, and perform time-frequency tracking based on the first signal. Since the terminal can perform time-frequency tracking based on the second signal and the TRS, rather than based solely on the TRS, on the one hand, the network-side device can use fewer TRS resources to send the TRS to the terminal, thereby reducing TRS resource overhead; on the other hand, through the joint measurement of the second signal and the TRS, the performance of time-frequency tracking can be further improved, thereby improving the transmission performance of the network.

[0243] The time-frequency tracking method provided in the embodiment of the present application can be executed by a time-frequency tracking device, a network-side device, or a functional module or entity in the network-side device. In the embodiment of the present application, the time-frequency tracking method provided in the embodiment of the present application is described by taking the network-side device executing the time-frequency tracking method as an example.

[0244] FIG15 shows a flow chart of a time-frequency tracking method provided by an embodiment of the present application. As shown in FIG15 , the time-frequency tracking method provided by an embodiment of the present application may include the following step 301 .

[0245] Step 401: A network-side device sends a first signal to a terminal.

[0246] In an embodiment of the present application, the first signal includes the second signal and TRS, and the first signal is used for time-frequency tracking.

[0247] In some embodiments of the present application, the manner of multiplexing the second signal and the TRS includes one of the following:

[0248] The second signal and TRS are time-division multiplexed;

[0249] The second signal and the TRS are frequency-division multiplexed;

[0250] The second signal and the TRS at least partially overlap.

[0251] It can be seen that since the embodiment of the present application stipulates different ways of multiplexing the second signal and TRS, the network side device can send the second signal and TRS in different prescribed ways, so that the terminal can use corresponding different ways to perform time and frequency tracking according to the different ways of multiplexing the second signal and TRS, instead of using a default way to perform time and frequency tracking. Therefore, the flexibility of the terminal in performing time and frequency tracking can be improved.

[0252] In some embodiments of the present application, the second signal and the TRS are time-division multiplexed, including at least one of the following modes:

[0253] First mode: In the first mode, the last first time unit occupied by the second signal is the Pth first time unit before the first first time unit occupied by the TRS, where P≥0;

[0254] The second mode, in the second mode, the last first time unit occupied by the TRS is the Qth first time unit before the first first time unit occupied by the second signal, Q ≥ 0;

[0255] The third mode. In the third mode, the first first time unit occupied by the second signal is the Sth first time unit after the first first time unit occupied by TRS, and the last first time unit occupied by the second signal is the Tth first time unit before the last first time unit occupied by TRS, S≥0, T≥0.

[0256] It can be seen that since the embodiment of the present application stipulates different modes for time division multiplexing of the second signal and TRS, the network side device can send the second signal and TRS according to the specified different modes, so that the terminal can use corresponding different methods to perform targeted time and frequency tracking according to the characteristics of the different modes of time division multiplexing of the second signal and TRS, rather than using a default method for time and frequency tracking. Therefore, the performance of the terminal in time and frequency tracking can be improved.

[0257] In some embodiments of the present application, when the second signal and the TRS are time-division multiplexed, at least one of the following conditions is satisfied between the second signal and the TRS:

[0258] The bandwidth of the second signal is within the bandwidth of the TRS;

[0259] The second signal and the TRS are located in the same second time unit;

[0260] The second signal and the TRS are separated by X second time units in the time domain, where X≥1.

[0261] It can be seen that since the embodiments of the present application specify the conditions that need to be met between the second signal and TRS when the second signal and TRS are time-division multiplexed, the network side device can send the second signal and TRS to the terminal in accordance with the above conditions, so that when the terminal determines that the second signal and TRS are time-division multiplexed, it can accurately perform time-frequency tracking based on the above conditions, thereby improving the performance of the terminal in time-frequency tracking.

[0262] In some embodiments of the present application, the second signal and the TRS are frequency-division multiplexed, including at least one of the following modes:

[0263] a fourth mode, in which the bandwidth of the second signal is adjacent to the bandwidth of the TRS;

[0264] The fifth mode: In the fifth mode, the second signal and the TRS are separated by Y first frequency domain units in the frequency domain, where Y ≥ 1;

[0265] The sixth mode: In the sixth mode, the bandwidth of the second signal and the bandwidth of the TRS overlap, and the second frequency domain unit occupied by the second signal and the second frequency domain unit occupied by the TRS are different.

[0266] It can be seen that since the embodiment of the present application stipulates different modes of frequency division multiplexing of the second signal and TRS, the network side device can send the second signal and TRS to the terminal according to the specified different modes, so that the terminal can use corresponding different methods to perform targeted time-frequency tracking according to the characteristics of the different modes of frequency division multiplexing of the second signal and TRS, rather than using a default method for time-frequency tracking. Therefore, the performance of the terminal in time-frequency tracking can be improved.

[0267] In some embodiments of the present application, the bandwidth of the second signal is adjacent to the bandwidth of the TRS, including at least one of the following:

[0268] The bandwidth of the synchronization signal in the second signal is adjacent to the bandwidth of the TRS;

[0269] The bandwidth of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS;

[0270] The bandwidth of the DMRS of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS;

[0271] The maximum bandwidth of all signals in the second signal is adjacent to the bandwidth of the TRS.

[0272] It can be seen that, since the embodiments of the present application specify multiple situations in which the bandwidth of the second signal and the bandwidth of the TRS are adjacent when the second signal and the TRS are frequency-division multiplexed, the network side device can send the second signal and TRS to the terminal in accordance with the specified different modes, so that when the terminal determines that the second signal and the TRS are frequency-division multiplexed, it can accurately perform time-frequency tracking based on the above-mentioned multiple situations, thereby improving the performance of the terminal in time-frequency tracking.

[0273] In some embodiments of the present application, the time domain resources occupied by the second signal and the time domain resources occupied by the TRS satisfy at least one of the following conditions:

[0274] The first third time unit occupied by the second signal is the same as the first third time unit occupied by the TRS;

[0275] The last third time unit occupied by the second signal is the same as the last third time unit occupied by the TRS;

[0276] The third time unit occupied by the synchronization signal in the second signal is the same as at least part of the third time unit occupied by the TRS;

[0277] The third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as at least part of the third time unit occupied by the TRS;

[0278] At least part of the third time unit occupied by the synchronization signal in the second signal is the same as the third time unit occupied by the TRS;

[0279] At least a portion of the third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as the third time unit occupied by the TRS.

[0280] It can be seen that since the embodiment of the present application stipulates the conditions that need to be met between the time domain resources occupied by the second signal and the time domain resources occupied by the TRS, the network side device can send the second signal and TRS to the terminal based on the conditions, so that when the terminal determines that the second signal and TRS are frequency-division multiplexed, it can accurately perform time-frequency tracking based on the above conditions, thereby improving the performance of the terminal in time-frequency tracking.

[0281] In some embodiments of the present application, the second signal and the TRS at least partially overlap, including at least one of the following modes:

[0282] a seventh mode, in which the synchronization signal and the TRS in the second signal at least partially overlap;

[0283] an eighth mode, in which the broadcast channel and the TRS in the second signal at least partially overlap;

[0284] Ninth mode: In the ninth mode, the broadcast channel DMRS and TRS in the second signal at least partially overlap.

[0285] It can be seen that since the embodiment of the present application stipulates different overlapping methods of the second signal and TRS, the network side device can send the second signal and TRS to the terminal according to the specified different overlapping methods, so that the terminal can use corresponding different methods to perform targeted time-frequency tracking according to the characteristics of the different overlapping methods of the second signal and TRS, rather than using a default method for time-frequency tracking. Therefore, the performance of the terminal in time-frequency tracking can be improved.

[0286] In some embodiments of the present application, the manner in which the second signal and the TRS at least partially overlap is determined by at least one of the following:

[0287] a synchronization signal in the second signal;

[0288] a cell identifier corresponding to the second signal;

[0289] a DMRS of a broadcast channel in the second signal;

[0290] Synchronous grid;

[0291] the index of the second signal;

[0292] System messages;

[0293] Layer 1 load;

[0294] Random access response message.

[0295] It can be seen that since the embodiment of the present application stipulates a method for determining the mode in which the second signal and TRS at least partially overlap, after the network side device sends the second signal and TRS to the terminal, the terminal can accurately determine the overlapping mode of the second signal and TRS based on this determination method.

[0296] In some embodiments of the present application, when the second signal and the TRS at least partially overlap, the time-frequency tracking method provided by the embodiment of the present application may further include the following step 401.

[0297] Step 401: The network-side device does not send a third signal on the time-frequency domain resources where the second signal and the TRS overlap.

[0298] In the embodiment of the present application, the third signal includes at least one of the following: a signal in the second signal that overlaps with the TRS, and a signal in the TRS that overlaps with the second signal.

[0299] As can be seen, since the network-side device can not send the signal in the second signal that overlaps with the TRS on the time-frequency domain resources where the second signal and the TRS overlap, the resource overhead of the second signal of the network-side device can be reduced; and / or, since the network-side device can not send the signal in the TRS that overlaps with the second signal on the time-frequency domain resources where the second signal and the TRS overlap, the resource overhead of the TRS of the network-side device can be reduced. In this way, the resource overhead of the network-side device can be reduced.

[0300] In some embodiments of the present application, at least one of the following conditions is satisfied between the second signal and the TRS:

[0301] The bandwidth of the second signal is within the bandwidth of the TRS;

[0302] The bandwidth of the TRS is within the bandwidth of the second signal;

[0303] The time domain resources occupied by the second signal overlap with the time domain resources occupied by the TRS;

[0304] The time domain resources occupied by the synchronization signal in the second signal overlap with the time domain resources occupied by the TRS;

[0305] The time domain resources occupied by the DMRS of the broadcast channel in the second signal overlap with the time domain resources occupied by the TRS.

[0306] It can be seen that since the embodiments of the present application specify the conditions that need to be met between the second signal and TRS when the second signal and TRS are time-division multiplexed, the network side device can send the second signal and TRS to the terminal in accordance with the specified conditions, so that when the terminal determines that the second signal and TRS at least partially overlap, it can accurately perform time-frequency tracking based on the above conditions, thereby improving the performance of the terminal in time-frequency tracking.

[0307] In some embodiments of the present application, the sequence of the TRS satisfies at least one of the following:

[0308] The TRS sequence is of the same type as the synchronization signal sequence in the second signal;

[0309] The starting position of the TRS sequence generation is the same as the starting position of the synchronization signal sequence generation in the second signal;

[0310] The type of the TRS sequence is determined based on whether the TRS is multiplexed with the second signal;

[0311] Initialization of the TRS sequence is related to the first identifier, and the first identifier is determined based on the second signal;

[0312] The initialization of the TRS sequence is related to the second identifier configured or indicated by the network side device.

[0313] It can be seen that since the conditions that the TRS sequence needs to meet are specified in the embodiment of the present application, after the network side device sends the second signal and TRS to the terminal, the terminal can accurately perform time and frequency tracking based on the above conditions, thereby improving the performance of the terminal in time and frequency tracking.

[0314] In some embodiments of the present application, there is at least one of the following associations between the second signal and the TRS:

[0315] There is a correlation between the second signal and the quasi-co-site QCL reference of the TRS;

[0316] There is a correlation between the transmission power of the second signal and the transmission power of the TRS;

[0317] There is a correlation between the transmission period of the second signal and the transmission period of the TRS.

[0318] It can be seen that since the association relationship between the second signal and TRS is specified in the embodiment of the present application, after the network side device sends the second signal and TRS to the terminal, the terminal can accurately receive the second signal and TRS based on the association relationship.

[0319] An embodiment of the present application provides a time-frequency tracking method, in which a network-side device can send a first signal including a second signal and a TRS to a terminal, wherein the first signal is used for time-frequency tracking. Since the network-side device can send the second signal and the TRS to the terminal so that the terminal can perform time-frequency tracking based on the second signal and the TRS, rather than only sending the TRS to the terminal, on the one hand, the network-side device can use fewer TRS resources to send the TRS to the terminal, thereby reducing the resource overhead of the TRS; on the other hand, through the joint measurement of the second signal and the TRS, the performance of the time-frequency tracking can also be further improved, thereby improving the transmission performance of the network.

[0320] Each of the above-mentioned method embodiments, or various possible implementation methods in each method embodiment, can be executed separately, or any two or more of them can be executed in combination with each other. The specific implementation can be determined according to actual usage requirements, and the embodiments of this application do not limit this.

[0321] The time-frequency tracking method provided in the embodiment of the present application can be executed by a time-frequency tracking device. In the embodiment of the present application, the time-frequency tracking device performing the time-frequency tracking method is used as an example to illustrate the time-frequency tracking device provided in the embodiment of the present application.

[0322] Figure 16 shows a possible schematic diagram of the structure of a time-frequency tracking device involved in an embodiment of the present application. As shown in Figure 16, the time-frequency tracking device 50 may include: a receiving module 51 for receiving a first signal from a network-side device, where the first signal includes a second signal and a TRS; and a tracking module 52 for performing time-frequency tracking based on the first signal received by the receiving module 51.

[0323] An embodiment of the present application provides a time-frequency tracking device. Since the time-frequency tracking device can perform time-frequency tracking based on the second signal and TRS, rather than performing time-frequency tracking based only on TRS, on the one hand, the network side device can use fewer TRS resources to send TRS to the time-frequency tracking device, thereby reducing the resource overhead of TRS; on the other hand, through the joint measurement of the second signal and TRS, the performance of time-frequency tracking can be further improved, thereby improving the transmission performance of the network.

[0324] In a possible implementation, the manner of multiplexing the second signal and the TRS includes one of the following: time division multiplexing of the second signal and the TRS; frequency division multiplexing of the second signal and the TRS; and at least partial overlap of the second signal and the TRS.

[0325] In one possible implementation, the above-mentioned second signal and TRS are time-division multiplexed, including at least one of the following modes: a first mode, in which the last first time unit occupied by the second signal is the Pth first time unit before the first first time unit occupied by TRS, and P≥0; a second mode, in which the last first time unit occupied by TRS is the Qth first time unit before the first first time unit occupied by the second signal, and Q≥0; a third mode, in which the first first time unit occupied by the second signal is the Sth first time unit after the first first time unit occupied by TRS, and the last first time unit occupied by the second signal is the Tth first time unit before the last first time unit occupied by TRS, and S≥0, T≥0.

[0326] In one possible implementation, when the second signal and the TRS are time-division multiplexed, at least one of the following conditions is satisfied between the second signal and the TRS: the bandwidth of the second signal is within the bandwidth of the TRS; the second signal and the TRS are located in the same second time unit; the second signal and the TRS are separated by X second time units in the time domain, where X ≥ 1.

[0327] In one possible implementation, the above-mentioned second signal and TRS are frequency-division multiplexed, including at least one of the following modes: a fourth mode, in which the bandwidth of the second signal and the bandwidth of the TRS are adjacent; a fifth mode, in which the second signal and the TRS are separated by Y first frequency domain units in the frequency domain, where Y ≥ 1; a sixth mode, in which the bandwidth of the second signal and the bandwidth of the TRS overlap, and the second frequency domain unit occupied by the second signal and the second frequency domain unit occupied by the TRS are different.

[0328] In one possible implementation, the bandwidth of the above-mentioned second signal is adjacent to the bandwidth of the TRS, including at least one of the following: the bandwidth of the synchronization signal in the second signal is adjacent to the bandwidth of the TRS; the bandwidth of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; the bandwidth of the DMRS of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; the maximum bandwidth of all signals in the second signal is adjacent to the bandwidth of the TRS.

[0329] In one possible implementation, at least one of the following items is satisfied between the time domain resources occupied by the above-mentioned second signal and the time domain resources occupied by TRS: the first third time unit occupied by the second signal is the same as the first third time unit occupied by TRS; the last third time unit occupied by the second signal is the same as the last third time unit occupied by TRS; the third time unit occupied by the synchronization signal in the second signal is the same as at least part of the third time unit occupied by TRS; the third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as at least part of the third time unit occupied by TRS; at least part of the third time unit occupied by the synchronization signal in the second signal is the same as the third time unit occupied by TRS; at least part of the third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as the third time unit occupied by TRS.

[0330] In one possible implementation, the above-mentioned second signal and TRS at least partially overlap, including at least one of the following modes: the seventh mode, in the seventh mode, the synchronization signal and TRS in the second signal at least partially overlap; the eighth mode, in the eighth mode, the broadcast channel and TRS in the second signal at least partially overlap; the ninth mode, in the ninth mode, the broadcast channel DMRS and TRS in the second signal at least partially overlap.

[0331] In one possible implementation, the pattern in which the above-mentioned second signal and TRS at least partially overlap is determined by at least one of the following: a synchronization signal in the second signal; a cell identifier corresponding to the second signal; a DMRS of a broadcast channel in the second signal; a synchronization grid; an index of the second signal; a system message; a layer 1 load; and a response message to a random access.

[0332] In one possible implementation, when the second signal and the TRS at least partially overlap, the time-frequency tracking apparatus 50 provided in the embodiment of the present application may further include: a processing module configured to perform a first operation on a third signal. The third signal includes at least one of the following: a signal in the second signal that overlaps with the TRS, or a signal in the TRS that overlaps with the second signal; and the first operation includes one of the following: discarding, puncturing, or rate matching.

[0333] In one possible implementation, at least one of the following conditions is satisfied between the second signal and the TRS: the bandwidth of the second signal is within the bandwidth of the TRS; the bandwidth of the TRS is within the bandwidth of the second signal; the time domain resources occupied by the second signal and the time domain resources occupied by the TRS overlap; the time domain resources occupied by the synchronization signal in the second signal and the time domain resources occupied by the TRS overlap; the time domain resources occupied by the DMRS of the broadcast channel in the second signal and the time domain resources occupied by the TRS overlap.

[0334] In one possible implementation, the sequence of the above-mentioned TRS satisfies at least one of the following: the type of the TRS sequence is the same as the type of the sequence of the synchronization signal in the second signal; the starting position of the generation of the TRS sequence is the same as the starting position of the generation of the synchronization signal sequence in the second signal; the type of the TRS sequence is determined based on whether the TRS is multiplexed with the second signal; the initialization of the TRS sequence is related to the first identifier, and the first identifier is determined based on the second signal; the initialization of the TRS sequence is related to the second identifier configured or indicated by the network side device.

[0335] In one possible implementation, there is at least one of the following associations between the second signal and the TRS: there is an association between the QCL reference relationship of the second signal and the TRS; there is an association between the transmission power of the second signal and the transmission power of the TRS; there is an association between the transmission period of the second signal and the transmission period of the TRS.

[0336] In one possible implementation, the time-frequency tracking device 50 provided in an embodiment of the present application may further include: a processing module configured to determine, based on the first information, at least one of the following: whether the second signal and the TRS are multiplexed; and a method for multiplexing the second signal and the TRS. The first information is information configured by a network device for the time-frequency tracking device 50, or information agreed upon in a protocol.

[0337] The time-frequency tracking device 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 chip. The electronic device can be a terminal, or it can be other devices other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 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.

[0338] The time-frequency tracking device provided in the embodiment of the present application can implement the various processes implemented in the method embodiments of Figures 2 to 14 and achieve the same technical effects. To avoid repetition, they will not be described here.

[0339] Figure 17 shows a possible structural diagram of a time-frequency tracking device involved in an embodiment of the present application. As shown in Figure 17, the time-frequency tracking device 60 may include: a sending module 61, configured to send a first signal to a terminal, the first signal including a second signal and a TRS, the first signal being used for time-frequency tracking.

[0340] An embodiment of the present application provides a time-frequency tracking device. Since the time-frequency tracking device can send a second signal and TRS to the terminal, so that the terminal can perform time-frequency tracking based on the second signal and TRS, instead of only sending TRS to the terminal, on the one hand, the time-frequency tracking device can use fewer TRS resources to send TRS to the terminal, thereby reducing the resource overhead of TRS; on the other hand, through the joint measurement of the second signal and TRS, the performance of time-frequency tracking can be further improved, thereby improving the transmission performance of the network.

[0341] In a possible implementation, the manner of multiplexing the second signal and the TRS includes one of the following: time division multiplexing of the second signal and the TRS; frequency division multiplexing of the second signal and the TRS; and at least partial overlap of the second signal and the TRS.

[0342] In one possible implementation, the above-mentioned second signal and TRS are time-division multiplexed, including at least one of the following modes: a first mode, in which the last first time unit occupied by the second signal is the Pth first time unit before the first first time unit occupied by TRS, and P≥0; a second mode, in which the last first time unit occupied by TRS is the Qth first time unit before the first first time unit occupied by the second signal, and Q≥0; a third mode, in which the first first time unit occupied by the second signal is the Sth first time unit after the first first time unit occupied by TRS, and the last first time unit occupied by the second signal is the Tth first time unit before the last first time unit occupied by TRS, and S≥0, T≥0.

[0343] In one possible implementation, when the second signal and the TRS are time-division multiplexed, at least one of the following conditions is satisfied between the second signal and the TRS: the bandwidth of the second signal is within the bandwidth of the TRS; the second signal and the TRS are located in the same second time unit; the second signal and the TRS are separated by X second time units in the time domain, where X ≥ 1.

[0344] In one possible implementation, the above-mentioned second signal and TRS are frequency-division multiplexed, including at least one of the following modes: a fourth mode, in which the bandwidth of the second signal and the bandwidth of the TRS are adjacent; a fifth mode, in which the second signal and the TRS are separated by Y first frequency domain units in the frequency domain, where Y ≥ 1; a sixth mode, in which the bandwidth of the second signal and the bandwidth of the TRS overlap, and the second frequency domain unit occupied by the second signal and the second frequency domain unit occupied by the TRS are different.

[0345] In one possible implementation, the bandwidth of the above-mentioned second signal is adjacent to the bandwidth of the TRS, including at least one of the following: the bandwidth of the synchronization signal in the second signal is adjacent to the bandwidth of the TRS; the bandwidth of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; the bandwidth of the DMRS of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; the maximum bandwidth of all signals in the second signal is adjacent to the bandwidth of the TRS.

[0346] In one possible implementation, at least one of the following items is satisfied between the time domain resources occupied by the above-mentioned second signal and the time domain resources occupied by TRS: the first third time unit occupied by the second signal is the same as the first third time unit occupied by TRS; the last third time unit occupied by the second signal is the same as the last third time unit occupied by TRS; the third time unit occupied by the synchronization signal in the second signal is the same as at least part of the third time unit occupied by TRS; the third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as at least part of the third time unit occupied by TRS; at least part of the third time unit occupied by the synchronization signal in the second signal is the same as the third time unit occupied by TRS; at least part of the third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as the third time unit occupied by TRS.

[0347] In one possible implementation, the above-mentioned second signal and TRS at least partially overlap, including at least one of the following modes: the seventh mode, in the seventh mode, the synchronization signal and TRS in the second signal at least partially overlap; the eighth mode, in the eighth mode, the broadcast channel and TRS in the second signal at least partially overlap; the ninth mode, in the ninth mode, the broadcast channel DMRS and TRS in the second signal at least partially overlap.

[0348] In one possible implementation, the pattern in which the above-mentioned second signal and TRS at least partially overlap is determined by at least one of the following: a synchronization signal in the second signal; a cell identifier corresponding to the second signal; a DMRS of a broadcast channel in the second signal; a synchronization grid; an index of the second signal; a system message; a layer 1 load; and a response message to a random access.

[0349] In one possible implementation, when the second signal and the TRS at least partially overlap, the sending module 61 is further configured to not send a third signal on the time-frequency domain resources where the second signal and the TRS overlap. The third signal includes at least one of the following: a signal in the second signal that overlaps with the TRS, or a signal in the TRS that overlaps with the second signal.

[0350] In one possible implementation, at least one of the following conditions is satisfied between the second signal and the TRS: the bandwidth of the second signal is within the bandwidth of the TRS; the bandwidth of the TRS is within the bandwidth of the second signal; the time domain resources occupied by the second signal and the time domain resources occupied by the TRS overlap; the time domain resources occupied by the synchronization signal in the second signal and the time domain resources occupied by the TRS overlap; the time domain resources occupied by the DMRS of the broadcast channel in the second signal and the time domain resources occupied by the TRS overlap.

[0351] In one possible implementation, the sequence of the above-mentioned TRS satisfies at least one of the following: the type of the TRS sequence is the same as the type of the sequence of the synchronization signal in the second signal; the starting position of the generation of the TRS sequence is the same as the starting position of the generation of the sequence of the synchronization signal in the second signal; the type of the TRS sequence is determined based on whether the TRS is multiplexed with the second signal; the initialization of the TRS sequence is related to the first identifier, and the first identifier is determined based on the second signal; the initialization of the TRS sequence is related to the second identifier configured or indicated by the time-frequency tracking device 60.

[0352] In one possible implementation, there is at least one of the following associations between the second signal and the TRS: there is an association between the QCL reference relationship of the second signal and the TRS; there is an association between the transmission power of the second signal and the transmission power of the TRS; there is an association between the transmission period of the second signal and the transmission period of the TRS.

[0353] In one possible implementation, whether the second signal and the TRS are multiplexed, and / or the manner in which the second signal and the TRS are multiplexed, is determined by first information, wherein the first information is information configured by the time-frequency tracking device 60 for the terminal, or information agreed upon in a protocol.

[0354] The time-frequency tracking device 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 chip. The electronic device can be a network-side device, or it can be a device other than a network-side device. For example, the terminal can include but is not limited to the types of network-side devices 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.

[0355] The time-frequency tracking device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 15 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0356] In some embodiments of the present application, as shown in FIG18 , an embodiment of the present application further provides a communication device 70, including a processor 71 and a memory 72, wherein the memory 72 stores a program or instruction that can be run on the processor 71. For example, when the communication device 70 is a terminal, the program or instruction, when executed by the processor 71, implements the various steps of the above-mentioned time-frequency tracking method embodiment and can achieve the same technical effect. When the communication device 70 is a network-side device, the program or instruction, when executed by the processor 71, implements the various steps of the above-mentioned time-frequency tracking method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0357] The present application also provides a terminal including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiment shown in FIG2 . This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, FIG19 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0358] The terminal 800 includes but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809 and at least some of the components of the processor 810.

[0359] Those skilled in the art will appreciate that the terminal 800 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 810 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 Figure 19 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.

[0360] It should be understood that in an embodiment of the present application, the input unit 804 may include a graphics processing unit (GPU) 8041 and a microphone 8042, and the graphics processor 8041 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 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 807 includes a touch panel 8071 and at least one of other input devices 8072. The touch panel 8071 is also called a touch screen. The touch panel 8071 may include two parts: a touch detection device and a touch controller. Other input devices 8072 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 an operating stick, which will not be repeated here.

[0361] In the embodiment of the present application, after receiving downlink data from a network-side device, the radio frequency unit 801 may transmit the data to the processor 810 for processing. Furthermore, the radio frequency unit 801 may send uplink data to the network-side device. Typically, the radio frequency unit 801 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0362] The memory 809 can be used to store software programs or instructions and various data. The memory 809 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 809 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 random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM). The memory 809 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0363] Processor 810 may include one or more processing units. Optionally, processor 810 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 810.

[0364] The radio frequency unit 801 is configured to receive a first signal from a network-side device, where the first signal includes a second signal and a TRS.

[0365] The processor 810 is configured to perform time-frequency tracking based on the first signal.

[0366] An embodiment of the present application provides a terminal. Since the terminal can perform time-frequency tracking based on the second signal and TRS, rather than performing time-frequency tracking based only on TRS, on the one hand, the network side device can use fewer TRS resources to send TRS to the terminal, thereby reducing the resource overhead of TRS; on the other hand, through the joint measurement of the second signal and TRS, the performance of time-frequency tracking can be further improved, thereby improving the transmission performance of the network.

[0367] In some embodiments of the present application, when the second signal and the TRS at least partially overlap, the processor 810 is further configured to perform the first operation on the third signal.

[0368] The third signal includes at least one of the following: a signal in the second signal that overlaps with the TRS, and a signal in the TRS that overlaps with the second signal; and the first operation includes one of the following: discarding, puncturing, and rate matching.

[0369] In some embodiments of the present application, the processor 810 is further configured to determine at least one of the following based on the first information:

[0370] Whether the second signal and TRS are multiplexed;

[0371] The second signal and TRS are multiplexed.

[0372] The first information is information configured by the network side device for the terminal, or information agreed upon by the protocol.

[0373] 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.

[0374] 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 of the method embodiment shown in FIG15 . 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 are applicable to this network-side device embodiment and can achieve the same technical effects.

[0375] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 20, the network-side device 900 includes an antenna 901, a radio frequency device 902, a baseband device 903, a processor 904, and a memory 905. Antenna 901 is connected to radio frequency device 902. In the uplink direction, radio frequency device 902 receives information via antenna 901 and sends the received information to baseband device 903 for processing. In the downlink direction, baseband device 903 processes the information to be transmitted and sends it to radio frequency device 902. Radio frequency device 902 processes the received information and then sends it through antenna 901.

[0376] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 903 , which includes a baseband processor.

[0377] The baseband device 903 may include, for example, at least one baseband board, on which multiple chips are arranged, as shown in Figure 20, one of which is, for example, a baseband processor, which is connected to the memory 905 through a bus interface to call the program in the memory 905 and execute the network device operations shown in the above method embodiment.

[0378] The network side device may further include a network interface 906, which is, for example, a Common Public Radio Interface (CPRI).

[0379] Specifically, the network side device 900 of the embodiment of the present application also includes: instructions or programs stored in the memory 905 and can be run on the processor 904. The processor 904 calls the instructions or programs in the memory 905 to execute the method of execution of each module shown in Figure 17 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0380] 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 time-frequency tracking method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0381] 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.

[0382] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned time-frequency tracking method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0383] 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.

[0384] 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 time-frequency tracking method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0385] An embodiment of the present application also provides a time-frequency tracking system, including: a terminal and a network-side device, wherein the terminal can be used to execute the steps of the time-frequency tracking method corresponding to the terminal side as described above, and the network-side device can be used to execute the steps of the time-frequency tracking method corresponding to the network-side device side as described above.

[0386] It should be noted that, in this article, the terms "comprise", "include" 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 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 sentence "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, and 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 also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0387] 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.

[0388] 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 time-frequency tracking method, wherein, including: The terminal receives a first signal from a network-side device, where the first signal includes a second signal and a Tracking Reference Signal (TRS); The terminal performs time-frequency tracking based on the first signal.

2. The method according to claim 1, wherein, The manner of multiplexing the second signal and the TRS includes one of the following: The second signal and the TRS are multiplexed in a time-division manner; The second signal and the TRS are multiplexed in a frequency-division manner; The second signal and the TRS at least partially overlap.

3. The method according to claim 2, wherein The second signal and the TRS being multiplexed in a time-division manner includes at least one of the following modes: The first mode, in which the last first time unit occupied by the second signal is the P-th first time unit before the first first time unit occupied by the TRS, where P≥0; The second mode, in which the last first time unit occupied by the TRS is the Q-th first time unit before the first first time unit occupied by the second signal, where Q≥0; The third mode, in which the first first time unit occupied by the second signal is the S-th first time unit after the first first time unit occupied by the TRS, and the last first time unit occupied by the second signal is the T-th first time unit before the last first time unit occupied by the TRS, where S≥0 and T≥0.

4. The method according to claim 2 or 3, wherein When the second signal and the TRS are multiplexed in a time-division manner, at least one of the following is satisfied between the second signal and the TRS: The bandwidth of the second signal is within the bandwidth of the TRS; The second signal and the TRS are within the same second time unit; The second signal and the TRS are separated by X second time units in the time domain, where X≥1.

5. The method according to claim 2, wherein The second signal and the TRS being multiplexed in a frequency-division manner includes at least one of the following modes: The fourth mode, in which the bandwidth of the second signal is adjacent to the bandwidth of the TRS; The fifth mode, in which the second signal and the TRS are separated by Y first frequency units in the frequency domain, where Y≥1; The sixth mode, in which the bandwidth of the second signal overlaps with the bandwidth of the TRS, and the second frequency unit occupied by the second signal is different from the second frequency unit occupied by the TRS.

6. The method according to claim 5, wherein, The bandwidth of the second signal being adjacent to the bandwidth of the TRS includes at least one of the following: The bandwidth of the synchronization signal in the second signal is adjacent to the bandwidth of the TRS; The bandwidth of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; The bandwidth of the Demodulation Reference Signal (DMRS) of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; The maximum bandwidth of all signals in the second signal is adjacent to the bandwidth of the TRS.

7. The method according to claim 5 or 6, wherein At least one of the following is satisfied between the time-domain resources occupied by the second signal and the time-domain resources occupied by the TRS: The first third time unit occupied by the second signal is the same as the first third time unit occupied by the TRS; The last third time unit occupied by the second signal is the same as the last third time unit occupied by the TRS; The third time units occupied by the synchronization signal in the second signal are the same as at least some of the third time units occupied by the TRS; The third time units occupied by the DMRS of the broadcast channel in the second signal are the same as at least some of the third time units occupied by the TRS; At least some of the third time units occupied by the synchronization signal in the second signal are the same as the third time units occupied by the TRS; At least some of the third time units occupied by the DMRS of the broadcast channel in the second signal are the same as the third time units occupied by the TRS.

8. The method according to claim 2, wherein The second signal and the TRS at least partially overlap, including at least one of the following modes: The seventh mode, in which the synchronization signal in the second signal and the TRS at least partially overlap; The eighth mode, in which the broadcast channel in the second signal and the TRS at least partially overlap; The ninth mode, in which the broadcast channel DMRS in the second signal and the TRS at least partially overlap.

9. The method according to claim 8, wherein The mode in which the second signal and the TRS at least partially overlap is determined by at least one of the following: The synchronization signal in the second signal; The cell identifier corresponding to the second signal; The DMRS of the broadcast channel in the second signal; The synchronization grid; The index of the second signal; The system message; The layer 1 payload; The random access response message.

10. The method according to claim 8 or 9, wherein In the case where the second signal and the TRS at least partially overlap, the method further includes: The terminal performs a first operation on the third signal; Wherein, the third signal includes at least one of the following: the signal in the second signal that overlaps with the TRS, the signal in the TRS that overlaps with the second signal; the first operation includes one of the following: discarding, puncturing, rate matching.

11. The method according to any one of claims 2, 8 to 10, wherein, At least one of the following is satisfied between the second signal and the TRS: The bandwidth of the second signal is within the bandwidth of the TRS; The bandwidth of the TRS is within the bandwidth of the second signal; The time domain resources occupied by the second signal and the time domain resources occupied by the TRS overlap; The time domain resources occupied by the synchronization signal in the second signal and the time domain resources occupied by the TRS overlap; The time domain resources occupied by the DMRS of the broadcast channel in the second signal and the time domain resources occupied by the TRS overlap.

12. The method according to any one of claims 2 to 11, wherein, The sequence of the TRS satisfies at least one of the following: The type of the sequence of the TRS is the same as the type of the sequence of the synchronization signal in the second signal; The starting position of the generation of the sequence of the TRS is the same as the starting position of the generation of the sequence of the synchronization signal in the second signal; The type of the sequence of the TRS is determined based on whether the TRS is multiplexed with the second signal; The initialization of the sequence of the TRS is related to a first identifier, and the first identifier is determined based on the second signal; The initialization of the sequence of the TRS is related to a second identifier configured or indicated by the network side device.

13. The method according to any one of claims 2 to 12, wherein, There is at least one of the following association relationships between the second signal and the TRS: There is an association relationship between the second signal and the quasi - co - location QCL reference relationship of the TRS; There is an association relationship between the transmission power of the second signal and the transmission power of the TRS; There is an association relationship between the transmission period of the second signal and the transmission period of the TRS.

14. The method according to claim 2, wherein The method further includes: The terminal determines at least one of the following through the first information: Whether the second signal and the TRS are multiplexed; The multiplexing method of the second signal and the TRS; Wherein, the first information is the information configured by the network - side device for the terminal or the information agreed by the protocol.

15. A time-frequency tracking device, wherein, The time - frequency tracking device includes: A receiving module, configured to receive a first signal from a network - side device, where the first signal includes a second signal and a TRS; A tracking module, configured to perform time - frequency tracking based on the first signal received by the receiving module.

16. A time-frequency synchronization method, wherein, It includes: The network - side device sends a first signal to the terminal, where the first signal includes a second signal and a TRS, and the first signal is used for time - frequency tracking.

17. The method according to claim 16, wherein, The multiplexing method of the second signal and the TRS includes one of the following: The second signal and the TRS are time - division multiplexed; The second signal and the TRS are frequency - division multiplexed; The second signal and the TRS at least partially overlap.

18. The method according to claim 17, wherein, The time - division multiplexing of the second signal and the TRS includes at least one of the following modes: The first mode, in which the last first time unit occupied by the second signal is the P - th first time unit before the first first time unit occupied by the TRS, P≥0; The second mode, in which the last first time unit occupied by the TRS is the Q - th first time unit before the first first time unit occupied by the second signal, Q≥0; The third mode, in which the first first time unit occupied by the second signal is the S - th first time unit after the first first time unit occupied by the TRS, and the last first time unit occupied by the second signal is the T - th first time unit before the last first time unit occupied by the TRS, S≥0, T≥0.

19. The method according to claim 17 or 18, wherein, In the case of time - division multiplexing of the second signal and the TRS, at least one of the following is satisfied between the second signal and the TRS: The bandwidth of the second signal is within the bandwidth of the TRS; The second signal and the TRS are within the same second time unit; The second signal and the TRS are separated by X second time units in the time domain, X≥1.

20. The method according to claim 17, wherein The frequency - division multiplexing of the second signal and the TRS includes at least one of the following modes: The fourth mode, in which the bandwidth of the second signal is adjacent to the bandwidth of the TRS; The fifth mode, in which the second signal and the TRS are separated by Y first frequency units in the frequency domain, Y≥1; Sixth mode, in the sixth mode, the bandwidth of the second signal overlaps with the bandwidth of the TRS, and the second frequency domain units occupied by the second signal are different from the second frequency domain units occupied by the TRS.

21. The method according to claim 20, wherein, The bandwidth of the second signal is adjacent to the bandwidth of the TRS, including at least one of the following: The bandwidth of the synchronization signal in the second signal is adjacent to the bandwidth of the TRS; The bandwidth of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; The bandwidth of the DMRS of the broadcast channel in the second signal is adjacent to the bandwidth of the TRS; The maximum bandwidth of all signals in the second signal is adjacent to the bandwidth of the TRS.

22. The method according to claim 20 or 21, wherein, At least one of the following is satisfied between the time domain resources occupied by the second signal and the time domain resources occupied by the TRS: The first third time unit occupied by the second signal is the same as the first such third time unit occupied by the TRS; The last third time unit occupied by the second signal is the same as the last such third time unit occupied by the TRS; The third time unit occupied by the synchronization signal in the second signal is the same as at least part of the third time units occupied by the TRS; The third time unit occupied by the DMRS of the broadcast channel in the second signal is the same as at least part of the third time units occupied by the TRS; At least part of the third time units occupied by the synchronization signal in the second signal is the same as the third time units occupied by the TRS; At least part of the third time units occupied by the DMRS of the broadcast channel in the second signal is the same as the third time units occupied by the TRS.

23. The method according to claim 17, wherein The second signal and the TRS at least partially overlap, including at least one of the following modes: Seventh mode, in the seventh mode, the synchronization signal in the second signal and the TRS at least partially overlap; Eighth mode, in the eighth mode, the broadcast channel in the second signal and the TRS at least partially overlap; Ninth mode, in the ninth mode, the broadcast channel DMRS in the second signal and the TRS at least partially overlap.

24. The method according to claim 23, wherein, The manner in which the second signal and the TRS at least partially overlap is determined by at least one of the following: The synchronization signal in the second signal; The cell identifier corresponding to the second signal; The DMRS of the broadcast channel in the second signal; Synchronization grid; The index of the second signal; System message; Layer 1 payload; Random access response message.

25. The method according to any one of claims 17 to 24, wherein In the case where the second signal and the TRS at least partially overlap, the method further includes: The network side device does not send a third signal on the time-frequency domain resources where the second signal and the TRS overlap; Wherein, the third signal includes at least one of the following: the signal in the second signal that overlaps with the TRS, the signal in the TRS that overlaps with the second signal.

26. The method according to any one of claims 17, 23 to 25, wherein, At least one of the following is satisfied between the second signal and the TRS: The bandwidth of the second signal is within the bandwidth of the TRS; The bandwidth of the TRS is within the bandwidth of the second signal; The time domain resources occupied by the second signal overlap with the time domain resources occupied by the TRS; The time domain resources occupied by the synchronization signal in the second signal overlap with the time domain resources occupied by the TRS; The time domain resources occupied by the DMRS of the broadcast channel in the second signal overlap with the time domain resources occupied by the TRS.

27. The method according to any one of claims 17 to 26, wherein The sequence of the TRS satisfies at least one of the following: The type of the sequence of the TRS is the same as the type of the sequence of the synchronization signal in the second signal; The starting position of the generation of the sequence of the TRS is the same as the starting position of the generation of the sequence of the synchronization signal in the second signal; The type of the sequence of the TRS is determined based on whether the TRS is multiplexed with the second signal; The initialization of the sequence of the TRS is related to a first identifier, and the first identifier is determined based on the second signal; The initialization of the sequence of the TRS is related to a second identifier configured or indicated by the network side device.

28. The method according to any one of claims 17 to 27, wherein There is at least one of the following association relationships between the second signal and the TRS: There is an association relationship between the quasi - co - location QCL reference relationship of the second signal and the TRS; There is an association relationship between the transmission power of the second signal and the transmission power of the TRS; There is an association relationship between the transmission period of the second signal and the transmission period of the TRS.

29. The method according to claim 17, wherein Whether the second signal and the TRS are multiplexed, and / or, the way in which the second signal and the TRS are multiplexed, is determined by first information; Wherein, the first information is information configured by the network side device for the terminal or information agreed upon by the protocol.

30. A time-frequency tracking device, wherein, The time - frequency tracking device includes: A sending module, configured to send a first signal to a terminal, where the first signal includes a second signal and a TRS, and the first signal is used for time - frequency tracking.

31. A terminal, wherein, It includes a processor and a memory, the memory stores a program or instruction that can run on the processor, and when the program or instruction is executed by the processor, the steps of the time - frequency tracking method according to any one of claims 1 to 14 are implemented.

32. A network-side device, wherein, It includes a processor and a memory, the memory stores a program or instruction that can run on the processor, and when the program or instruction is executed by the processor, the steps of the time - frequency tracking method according to any one of claims 16 to 29 are implemented.

33. A readable storage medium, wherein, The program or instruction is stored on the readable storage medium, and when the program or instruction is executed by the processor, the time - frequency tracking method according to any one of claims 1 to 14 is implemented, or the steps of the time - frequency tracking method according to any one of claims 16 to 29 are implemented.

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